Internet-Draft ESON January 2022
Spinella Expires 31 July 2022 [Page]
Workgroup:
TBD
Internet-Draft:
draft-spinella-event-streaming-open-network-02
Published:
Intended Status:
Informational
Expires:
Author:
E. Spinella
Syndeno

Event Streaming Open Network

Abstract

This document describes the vision, architecture and network protocol for an Event Streaming Open Network over the Internet.

About This Document

This note is to be removed before publishing as an RFC.

The latest revision of this draft can be found at https://example.com/LATEST. Status information for this document may be found at https://datatracker.ietf.org/doc/draft-spinella-event-streaming-open-network/.

Source for this draft and an issue tracker can be found at https://github.com/syndeno/draft-spinella-event-streaming-open-network.

Status of This Memo

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Table of Contents

1. Introduction

Society is rapidly digitalizing and automating the exchanges of value that constitute the economy. Also, considerable time and energy is spent to assure that key transactions can be executed with reduced human involvement with better, faster, and more accurate results. In this context, Event Streaming can play a key role in how the economic system evolves.

However, most of the application layer integrations executed today across organizational boundaries are not in real time. Also, they currently require employing a variety of formats and protocols. Some industries have adopted data formats for exchanging information between organizations, such as Electronic Data Interchange (EDI). However, those integrations are limited to specific use cases and represent a small fraction of all demanded organizational integrations.

Thus, there is no consistent and common consensus on a mechanism for the exchange of events across organizations. This results in a completely custom landscape for each real-time cross-organization integration. In this scenario, development teams must invest plenty of time into understanding and defining a common interface for events exchange.

In this context, we can now introduce how this landscape could change with the introductiopn of an Event Streaming Open Network over the Internet. When needing to connect real-time event flows across organizations, developers would have a common basis for finding, publishing, and subscribing to event streams. Also, given a set of standard formats to encode and transmit events, developers could use the programming language of their choice. Overall, this set of standards would drastically reduce the cost of real-time integration, which would also enable experimentation by users.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here.

2. An Open Network for Event Streaming over the Internet

In this section, we will argue how Internet standards are developed and why this could be the case for an Event Streaming Open Network.

An interesting example of this phenomenon is the case of ISDN (Integrated Services Digital Network), a set of communications standards for the transmission of voice, video, and data over the PSTN (Public Switched Telephone Network) developed by the ITU-T (Telecommunication Standardization Sector) in 1988. ISDN pretended to use the existing public telephone network to transmit digital data in a time when the Internet connectivity access was not as broadly available as it is today. The main competitor of this standard was the incipient Internet itself, which could be used to transmit the same data.

The Internet alternative needed a protocol to support the same services offered by ISDN, which was initially developed by the conjoint effort of the academic and private sector. Consequently, in 1992 the Mbone (Multicast Bone) was created. This project was an experimental network backbone built over the Internet for carrying multicast IP traffic, which could be used for multimedia content. After some important milestones of this project, the SIP (Session Initiation Protocol) was defined in 1996 and was published as a standard protocol in IETF's [RFC3261]. The reality today is that SIP has completely won the standards battle for multimedia transmission over the Internet, and ISDN usage has been on continuous decline.

As for Event Streaming, we see a similar scenario set-up today. There are currently several open specifications and implementations for Event Streaming, like AMQP (Advanced Messaging Queueing Protocol), supported by RabbitMQ. However, while AMQP can be used for several purposes, Kafka Protocol specializes on Event Streaming Processing and its specialized features make it more convenient than RabbitMQ (i.e. ordering).

In the case of an Event Streaming Open Network over the Internet, if we guide ourselves by the history of the most widely adopted protocols on the Internet, the governance should be similar to that of the WWW or Email. Both the WWW and Email have open specifications as well as open-source implementations. We can mention the Apache Web Server as an open-source implementation of the HTTP protocol; Postfix for SMTP; and Bind for DNS. Nevertheless, the governance for these protocols' specifications relies on the IETF.

In order to define the characteristics of an Event Streaming Open Network, we will focus on the definition of shared and openly accessible infrastructure. First, we will review the principles of Free, Open & Neutral Networks and why they should be followed for an Event Streaming Open Network. Then, we will show how DNS complies with the criteria to be considered an infrastructure resource. Finally, we will demonstrate how this is also true for Event Streaming.

2.1. Free, Open & Neutral Networks (FONN)

The main principles of a Free, Open & Neutral Network are:

  • It is open because it is universally open to the participation of everybody without any kind of exclusion nor discrimination, and because it is always described how it works and its components, enabling everyone to improve it.
  • It is free because everybody can use it for whatever purpose and enjoy it independently of his network participation degree.
  • it is neutral because the network is independent of the contents, it does not influence them and they can freely circulate; the users can access and produce contents independently to their financial capacity or their social condition. The new contents produced are orientated to stimulate new ones, or for the network administration itself, or simply in exercise of the freedom of adding new contents, but not to replace or to to block other ones.
  • It is also neutral with regard to the technology, the network can be built with whatever technology chosen by the participants with the only limitations resulting of the technology itself.

2.2. Non-discriminatory and open access

Services such as DNS, the World Wide Web and Email do not discriminate and are open-accessible. Basically, people and organizations can access these networks as long as they can register an Internet Domain and host the required server components. Nowadays, there are alternatives to avoid having to register a domain name to have a web page or an email, such as Cloud WordPress Hosting or Gmail. However, we will focus on the network participants that provide services to end-users.

In the case of Guifi.net, we can highlight how this principle has been adopted in the fact that everybody can take part in the project without discrimination. Moreover, an emphasis is made in easing the participation of the disadvantaged collectives, with less resources or less opportunities to access information technologies, telecommunications, and the Internet.

An Event Streaming Open Network should provide resources in a similar way than the most widely adopted Internet Services. Thus, individuals and organizations must be able to register Flow address spaces for which the existing DNS infrastructure could be leveraged. Moreover, the specification of the protocols that implement the Metadata and Payload formats must also be openly accessible.

2.3. Open participation

Internet Services like DNS, WWW and Email provide individuals and organizations with different ways of participation. First, anybody can obtain the protocols' specification and build a custom implementation, which would result in a new product compatible with the protocols. Secondly, anybody can register a domain name and set up servers using compatible products. Thirdly, anybody can join and participate in the IETF, the institution that governs the specifications for these protocols.

As for Guifi.net, not only anybody can extend the network with new nodes but also can also participate in existing projects of network extension. Also, the participants can add services on top of the network such as VoIP, FTP servers, broadcast radios, etc.

Regarding active participation on an Event Streaming Open Network, we can highlight the possibility for individuals and organizations to expand the services provided by the open network. This extensibility could be made possible by different uses of the event payloads and will vary significantly depending on the sector. Since we have already proved how Flow is an infrastructure resource, innovation would play its part and its results would be materialized in services expansion.

We can conclude that the same kind of openness of DNS, WWW and Email is necessary for an Event Streaming Open Network. Anybody should be able to obtain the specifications to build an implementation of the service. Also, since it should leverage the DNS infrastructure, anybody would be able to register Flow address spaces. Lastly, the specification could be governed by an institution such as the IETF, due the dependency of Flow with other Internet Services governed by this institution.

2.4. Open Access Infrastructure Resources

The literature about Commons Infrastructure (Frischmann, 2007) defines a set of criteria to evaluate if a resource can be considered an infrastructure resource. This analysis is relevant since it can provide some arguments to prove the need of an infrastructure of commons for Event Streaming, which could then be materialized in an Open Network for Event Streaming. The demand-side criteria for evaluating if a given resource can be considered as an infrastructure resource are:

  1. The resource can be consumed nonrivalrously.
  2. Social demand for the resource is driven primarily by downstream productive activity that requires the resource as an input.
  3. The resource is used as an input into a wide range of goods and services, including private goods, public goods and/or non-market goods.

First, a nonrival good describes the "shareable" nature of a given good. Infrastructures are shareable in the sense that the resources can be accessed and used by multiple users at the same time. However, infrastructure resources vary in their capacity to accommodate multiple users, and this variance in the capacity differentiates nonrival resources from partially rival resources. A nonrival resource represents those resources with infinite capacity, while a partially rival resource has finite but renewable capacity. As an example, Broadcast Television is a nonrival resource since additional users do not affect the capacity of the resource. On the other hand, natural oil resources are completely rival since its availability is limited and it is not renewable. In the middle, we have partially rival resources like a highway, which may be congested. This last characteristic is also true for the Internet since it supports additional users without degrading the service to existing users to a certain extent.

Secondly, infrastructure resources consumption is primarily driven by downstream activities that require this resource as an input. This means that the broad audience consumes infrastructure resources indirectly. For instance, highway infrastructure is used to transport every kind of physical good which people and organizations purchase. This facilitates the generation of positive externalities for society through the downstream production of public goods and non-market goods. These positive externalities might be suppressed under a regime where resource availability is driven solely based on individuals' willingness to pay.

Regarding willingness to pay, it is relevant to analyze this factor more exhaustively. Frischmann states that if infrastructure access is allocated based on individuals' willingness to pay the potential positive externalities of that infrastructure might be stifled. Thus, infrastructure resources behave differently than end-user products: if the former are made available solely based on the end-user demands and willingness to pay, those needed infrastructure resources might never be made available. As an example, we can mention that if airports were built based on individuals' willingness to pay for them, they might not even be built. However, individuals are willing to pay for the airport's downstream activities, such as purchasing a flight or consuming air-transported goods. Then, a whole set of positive externalities are generated by the existence of an airport in a city.

In the third place, infrastructure resources are used as input for a wide range of outputs. This criterion emphasizes both the variance of the downstream outputs and their nature. Thus, the infrastructure resources possess a high level of genericness which enable productive activities that produce different goods with high variance. If we consider how an airport complies with this criterion, we can mention that not only airports serve individuals that need to travel by air but are also used to transport many kinds of physical goods. These goods then enable other activities throughout the downstream value chain. Then, the output variance of the activities that take airport infrastructure as input is significantly high.

2.4.1. Open Access DNS Resource Example

Now, we will provide as an example how DNS complies with these criteria and why it can be considered an infrastructure resource. 1. DNS infrastructure is a partially rival resource because individuals and organizations can register domains in the Domain Name addressing space. It is partially rival because not every actor can acquire the same domain name. However, the access to registering domain names is open and non-discriminatory. Moreover, DNS is also prone to congestion, which emphasizes its partially rival nature. 2. DNS infrastructure demand is driven principally by downstream products and services. An average Internet user is not paying directly for this infrastructure, but all the Internet services the user consumes pay for DNS infrastructure. This is true for all the Internet services due to the ubiquitous nature of DNS infrastructure. 3. All Internet services take as input DNS infrastructure and produce a broad variety of outputs, which then generate positive externalities to society as a whole by means of private goods, public goods and/or non-market goods.

We can conclude that DNS complies with Frischmann criteria for being considered as an infrastructure resource. The resource is represented both by the domain name that can be and by the querying capacity of DNS servers.

2.4.2. Flow: Event Streaming Internet Resource

In this section, we will describe an Event Streaming Internet Resources. For this, we will consider the previously described guidelines for FONN as well as the characteristics of DNS as a resource. This Event Streaming Internet Resource shall be refered to as "flow" from now onwards.

To begin with, we need to define what elements could be considered as infrastructure resources in an Event Streaming Open Network. First, the resource must be capable of delivering streams of events to consumers. Secondly, it must also permit producers to write events to the stream. Thirdly, each stream must be identifiable (i.e., URI) and able to be located (i.e., URL). From now on, we will use "Flow" to refer to the infrastructure resource of an Event Streaming Open Network. The first Frischmann criterion requires the resource to be consumed nonrivalrously. Complete nonrivalrously for any Internet Service cannot be achieved due to the possibility of congestion and potential unavailability of different elements of the network. The same would be true for a Flow resource. Moreover, the public naming addressing space for Flows would be limited to the same level as that of domain names.

We will continue now with the third criterion. To illustrate the potential of Flow being used as inputs for downstream activities, we will refer to Urquhart's vision for Event Streaming. He lists two areas in which significant changes can happen:

  1. The use of time-critical data for customer experience and efficiency. This is driven because today's consumers are increasingly expecting great experiences, and organizations are almost always motivated to improve the efficiency of their operations.
  2. The emergence of new businesses and business models. Businesses and institutions will quickly discover use cases where data processed in a timely manner will change the economics of a process or transaction. They may even experiment with new processes, made possible by this timely data flow. Thus, flow resources will also enable innovation. These innovations are responsible for generating positive externalities.

Then, we have demonstrated why Flow resources can be considered as infrastructure resources using Frischmann's Demand-side Theory of Infrastructure. These resources can be managed in an open manner to maximize positive externalities, which basically means maintaining its open access, not discriminating, and eliminating the need to obtain licenses to use the resources. Consequently, managing infrastructure resources in this manner eliminates the need to rely on either market actors or governments.

Lastly, the adoption of an Event Streaming Open Network implies taking Flow resources as inputs for productive activities. These inputs would then be used downstream to generate private goods, public goods and/or non-market goods. Additionally, we can assure that most of the consumers of Flow would not directly consume Flow resources. They would consume the outputs of downstream activities that use Flow as input. Again, the consumers may not be willing to pay for Flow resources directly.

We can conclude this section mentioning that an Event Streaming Open Network would enable one infrastructure resource called Flow. The access to this resource can be managed in an openly manner: maintaining open access, not discriminating users or different uses of the resource, and eliminating the need to obtain approval or a license to use the resource.

3. Necessities for an Event Streaming Open Network over the Internet

In this section, we will describe the main needs for the broad adoption of Event Streaming. The focus will be made on detecting and describing the missing capabilities that could not only enable but also accelerate the event data integration among different organizations. The different necessities detailed in this section will serve as input for an architecture design.

3.1. Necessity 1: Event Streaming Internet Resource Public Registry

A public registry of an organization's available event streams does not exist. We will argue in this section why this is the core component that an Event Streaming Open Network can provide.

Nowadays, when an organization needs to publish an event stream or event flow, they usually follow some form of the following steps:

  1. Develop and deploy a producer application that writes events to a queue.
  2. Create all necessary networking permissions for external public access to the queue.
  3. Inform the remote user the access information (i.e., Hostname/IP, protocol, and port) together with the required client details and technology for accessing the stream (i.e., Apache Kafka Protocol, RabbitMQ API, etc.).
  4. Create credentials for consumer authentication and authorization access to the queue. 5.Develop and deploy a consumer application that reads the queue.

Now, we can compare this process to a simple email interaction: 1. Sender opens a graphical Mail User Agent application and sends an email to an email address formatted as user@domain. 2. The message is sent to an SMTP server that routes it to the destination SMTP servers for the given domain. Once received, the message is put into the user mailbox. 3. When the recipient checks its mailbox by IMAP or POP3, the new email is transferred to the Mail User Agent.

In these two scenarios, we can see that the information needed to be exchanged offline by the actors is completely different in size and content.

First, in the case of email, there is a shared naming space given by the Domain Name Service (DNS). The email format has been standardized by the IETF in [RFC5321], section 2.3.11. Thus, there is a common naming space that is used for referencing mailboxes in the format user@domain. Thus, the offline details communicated by the peers is only the recipient email address. There is no analogous standard nor an open alternative for Event Streaming.

Therefore, in the case of Event Streaming, users need to perform plenty of offline communication to agree not only on the technology to use but also on the queue to use. For instance, two organizations may be currently using Apache Kafka and need to share an event stream among themselves. The organization having the source of the stream should provide the following details to the consumer organization: * Bootstrap servers: Fully Qualified Domain Name list of the Apache Kafka brokers to start the connection to the Apache Kafka Brokers. Example: tcp://kf1.cluster.emiliano.ar:9092, tcp://kf2.cluster.emiliano.ar:9092, tcp://kf3.cluster.emiliano.ar:9092 * Topic or Queue name: name of the topic resource in the Apache Kafka Cluster * Authentication information: User and password, TLS Certificate, etc.

In the case these organizations were not both using Apache Kafka, the use case cannot be simply solved without incurring in development or complex configurations as well as adopting proprietary components.

We can conclude that an Event Streaming Open Network should provide a global accessible URI for streams in a similar fashion than email, to reduce offline developers' interactions. This means being able to name event streams in a common naming space like DNS, as well as providing a mechanism for users to discover the location and connections requirements.

3.2. Necessity 2: Establishment of a User Space for Events

Another need for broad adoption is due to the inexistence of a common and agreed user convention. In the general literature, we cannot find reference to the types of users that would consume or produce events to and from an event stream.

In this sense, it is also appropriate to consider the email use case. Basically, an email user only needs to know the email address, the password, the URL of a web mail client or the details of IMAP/POP3 server connection. Once the user has this information, it's possible to access an email space or mailbox where the user can navigate the emails in it. Also, IMAP provides the possibility for the user to create folders and optionally share them with other users.

There is no analogous service currently available for Event Streaming analogous to the email case. This means that the user concept in Event Streaming is limited to authentication and authorization. Thus, the user does not have access to a "streambox". The result is the impossibility for a person or an application to possess a home directory containing all the streams owned by the user.

As a conclusion for this section, we can mention that it is necessary to embrace a user space resource for Event Streaming. This resource should not only solve the users' motivations and requirements but also reduce the offline verbal communications and custom development dependencies. In the next sections, we will refer to this component as the Event User Space Service.

3.3. Necessity 3: An Agnostic Subscription Protocol

A third need for wide adoption is an agnostic protocol to manage subscriptions to event streams. For this need to be solved, it would be necessary first to count with an Event User Space Service. Then, in case a user has created a stream and wants to enable public subscriptions by other users, there is no general protocol to inform other parties of this subscription intention nor its confirmation.

The result is the inability for the users to seamlessly subscribe to an event stream. They either must employ protocols like MQTT or, in the need of employing other application protocols like Apache Kafka, hardcode the subscription details in the different software implementations. This means that there is no general subscription protocol for Event Streaming that is agnostic of the application protocol employed. This protocol implements both the Metadata Payload Format and Payload Format.

A good example to illustrate the difference between a control protocol that implements a Metadata Payload Format from a payload protocol that implements a Payload Format is how SIP (Session Initiation Protocol) works with RTP (Real Time Protocol) to provide VoIP capabilities. The former is a control protocol that initiates and maintains a session or call while the latter is the one responsible for carrying the payloads, which in the case of VoIP it would be coded audio.

Consequently, a similar definition of protocols could potentially mitigate this limitation for Event Streaming. If a protocol can be used to establish and maintain the subscriptions relationships while another different protocol is used for the events payload, all the current application protocols implementations could be supported.

Additionally, by counting also with an Event Streaming Public Registry, it would be possible to provide URI for streams in a similar way as email works with the "mailto" URI. For instance, in web pages one can find that email addresses are linked to mailto URIs which, when clicked, open the default email user application (i.e., Microsoft Outlook) to send an email to the referenced email address.

If a user counts with a user space or streambox, then a user application like an email client could provide access to it. Then, if the user clicks on a link of a stream URI (i.e. "stream:myeventflow"), the streambox application would open and subscribe to the given stream.

Currently, the Metadata Payload Format as well as the Payload Format are both provided by the queue or log application protocol. In the case of Apache Kafka, both formats are implemented within the Apache Kafka Protocol. This introduces a barrier for interoperability among different technologies, meaning that flows of event data cannot be seamlessly connected, without relying on custom development or proprietary software licensing.

We can conclude that there is an actual need for an open specification of an Event Subscription Service for event streams, which implements what Urquhart calls Metadata Payload Format. This specification could be materialized in a network protocol that introduces an abstraction for the event queue or log technologies implemented by different organizations.

3.4. Necessity 4: An Open Cross-sector Payload Format

Currently, the different implementations of Event Streaming combine both the Payload Format with the Metadata Format. This means that the same protocol utilized for payload transport is used for subscription management.

When a producer intends to publish events to a queue or, using Apache Kafka terminology, when a producer intends to write records to a topic, first it needs to initiate a connection to at least one of the Apache Kafka Brokers. In that initial exchange of TCP packages, the producer is authenticated, authorized, and informed with topic details. This set of transactions would belong to a protocol that implements a Metadata Payload Format. Afterwards, when the Producer starts writing the events to the topic, it encapsulates the event payload in a Kafka Protocol message. This latter behavior makes use of a Payload Format. Thus, we can observe how both theoretical formats are coupled in a single protocol. Similar behavior of a coupled Metadata and Payload Format in one single protocol happens also in AMQP, MQTT and RabbitMQ.

As for the consumer, the behavior is the same with the difference that the initial intention is to subscribe to a queue or, in Apache Kafka terminology, to consume records of a topic. Then, a set of TCP packages encapsulating the Apache Kafka protocol authenticates, authorizes, and informs the Consumer with topic details for consumption. Afterwards, the consumer can start polling for new records in the different partitions of the topic. It is worth mentioning that the consumer needs to implement more queue management logic than the Producer, especially when multiple replicas of a consumer type are deployed.

If we focus on the Payload Format, there is the need for an implementation-agnostic payload format suitable for Event Streaming. In this sense, CloudEvents project of the CNCF proposes a specification and a set of libraries for this purpose. The goal is to use CloudEvents specification as a Payload Format regardless of the Payload Protocol being used. For instance, we could transmit events in the CloudEvents format using the Kafka or AMQP Protocol.

The general structure of the CloudEvents Payload Format includes a standardized methodology to include event data in an event message. For instance, instead of defining a customized JSON structure for sending the events of temperature changes measured by a device, a CloudEvent object could be used. Temperature could be included as an attribute in the CloudEvent object.

We can then conclude that while there is no current protocol candidate that implements the Metadata Format, CloudEvents is a good candidate for the Payload Format needed in an Event Streaming Open Network. In this way, the different CloudEvents libraries made available in several programming could be leveraged.

4. Event Streaming Open Network Architecture

In this section, we will describe the overall architectural proposal for an Event Streaming Open Network. This description will include the different actors in play, the software components required, as well as the network protocols that should be specificized.

4.1. Architecture overview

In Figure 1 we illustrate a high-level overview of an architecture proposal for the Open Network.

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Figure 1: Figure 1

We can identify different Network Participant (NP) in Figure 1 represented by different colors. The different NPs act as equals when consuming or producing events as part of the Flows they own. All of NPs implement the Event Streaming Open Network Protocol, which Is described in the next chapter.

In the diagram, an initial flow starts on the orange NP to which a user in the blue NP is subscribed. After processing the events received in the first flow, the results are published to a new flow in NP blue, to which the orange NP is subscribed as well. Now, the green participant is subscribed to the same flow, enabling downstream activities across the rest of the network participants.

It is possible to observe how the high-level architecture allows sharing the streaming of events across different network participants and their users. Also, there is also the need for security, in order to allow or deny the access to write to and read from flows.

Regarding security, the architecture considers the integration with an Identity & Access Management service, which could implement popular protocols such as OAuth, SAML or SASL. However, the network should also enable anonymous access in the same way FTP does. This means that a given NP could publicly publish flow and allow any party to subscribe to it.

For example, nowadays the Network Time Protocol (NTP) is used to synchronize the day and time on servers. There are many NTP servers available that allow anonymous access, meaning that the service is openly available. The same must be considered for the Event Streaming Open Network.

Additionally, the NP must be able to expand the capacity to support any number of flows, as well as extending the network with new services. Not only NP must be able to include any given set of data within events but also, they must be able to build applications and services on top of the network by employing the architecture primitives.

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Figure 2: Figure 2

Now, we provide a brief description of all the components that appear in the diagram of Figure 2. In the next sections further details of the components are provided.

  • Flow Events Broker (FEB): a high-available and fault-tolerant service that provide queues to be consumed by network services, by users, and their applications. An example of an Event Queue Broker can be Apache Kafka, AWS SQS or Google Cloud PubSub. The payload format implemented by these tools are what in 3.1.4 we called Event Streaming Payload Format.
  • Flow Name Service (FNS): a DNS-based registry that acts as an authoritative server for a set of domain names, which are used to represent flow addresses in a flow namespace. These domains contain all the necessary information to resolve flow names into flow network locations. This component refers to what in 3.1.1 we named Event Streaming Registry.
  • Flow Namespace User Agent (FNUA): an application similar to User Mail Agents like Microsoft Outlook or Gmail. This application provides access to flow namespaces to users of the network. The definition of this component implies the specification of a dedicated protocol. We will refer to this protocol as FNAP (Flow Namespace Accessing Protocol).
  • Flow Namespace Accessing Agent (FNAA): the server-side of the Flow Namespace User Agent. This component is the one that must provide convenient integration methods for GUI. This component refers to what in 3.1.2 we named Event User Space Service. This component must implement the same protocol selected for the Flow Namespace User Agent: FNAP (Flow Namespace Accessing Protocol).
  • Flow Processor (FP): a flow processing instance used to set up subscriptions that connect local or remote flows on demand. This component implements the processing part of what in 3.1.3 we called Event Subscription Service. This component will be created and managed by a FNAA instance, and the communication is held through an Inter-process Communications (IPC) interface. Also, this service must implement an Event Payload Format, for which we will mainly consider CNCF's CloudEvents and Protobuf.
  • Flow Namespace Accessing Protocol (FNAP): the protocol implemented in the Flow Namespace Accessing Agent as well as in the Flow Namespace User Agent. The former will act both as a server and a client while the latter only as a client. This protocol is described in the next chapter.

4.1.1. Flow Events Broker (FEB)

The FEB implementation that we will mostly consider is Apache Kafka. This open-source project is quickly becoming a commodity platform, and major cloud providers are building utilities for it. However, as a design decision, it should be possible to use the same protocols to support other applications, such as RabbitMQ, Apache Pulsar or the cloud-based options like AWS SQS or Azure Events Hub.

Apache Kafka is the ecosystem leader in the Event Streaming space, considering mainly adoption. There is a growing set of tools and vendors supporting its installation, operation, and consumption. This fact makes Apache Kafka much more appealing to enterprise developers. However, the broker should provide a common set of functionalities which can be seen in the diagram of Figure 3.

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Figure 3: Figure 3

The selection of the Events Broker will impact on the implementation of the Flow Namespace Accessing Agent. This last component will be responsible for knowing how to set up and manage flows on top of different Events Brokers.

4.1.2. Flow Name Service (FNS)

FNS is a core component for the overall proposed architecture. This component provides all needed functionalities for obtaining Flow connection details based on a Flow URI (Uniform Resource Identifier). Thus, it is required to define a URI format for Flow resources and to specify mechanisms for resource location resolution.

In this section, we will focus on describing both the URI for Flow as well as the DNS mechanism for obtaining Flow network location details.

4.1.2.1. Leveraging DNS infrastructure

As mentioned previously, this component must maximize its leverage on the existing Internet DNS infrastructure. The reason for this requirement is to avoid defining new protocols and services that prevent broad adoption. Currently, DNS is the de facto name resolution protocol for the Internet, and there exist libraries for its usage on every programming language.

Whereas DNS is mainly used to resolve FQDN (Fully Qualified Domain Names) into IP addresses, there are many other functionalities provided by the global DNS infrastructure. Theoretically, DNS is an open network of a distributed database. Individuals and organizations that want to participate in the network need to register a domain name and set up Authoritative DNS servers for domains.

It is not in the scope of this work to detail the different available usages of DNS functionalities, but we can mention that it provides special Resource Records (i.e., types of information for a FQDN) that are solely used by special protocols. For instance, the MX Resource Records are used by SMTP servers to exchange email messages.

For the Flow Open Network, it will be required to define a URI format for flows as well as the mechanism to resolve an URI into all the needed information to connect to a flow. In the case of email, a URI is the email address while the connection details will be the SMTP server responsible for receiving emails for that account. For instance, an email URI could be user@domain.com while its connection details could be smtp://mail.domain.com. The way in which the connection details are obtained is by resolving the MX DNS Resource Records of domain.com, which in this example is mail.domain.com.

4.1.2.2. Flow URI

As we mentioned previously, the first needed element is a URI definition for flow resources. These resources identification must capture the following details: * Domain, a registered domain in which create flow resources references. For example, airport.com. * Flow Namespace, a subdomain which is solely used by users to host flow names. This subdomain must be delegated to the Flow Name Server component and desirable should not be used for any other purpose other than flow. * Flow Name, a name for each flow that must be unique within its domain. The combination of flow name and flow domain results in an FQDN. For instance, we could have a flow named arrivals of the domain flow.airport.com. Thus, the FQDN of the flow would be arrivals.flow.airport.com. Also, the name can contain dots so that the following FQDN could be also used: airline.arrivals.flow.airport.com.

Thus, the general syntax of a flow URI would be:

flow://flow_name.flow_namespace.domain

This URI has the advantage that is similar to "mailto" URI and could be implemented in HTML to refer to flow resources. Some examples:

  • flow://entrances.building.company.com
  • flow://exits.building.company.com
  • flow://temperature.house.mydomain.com
  • flow://pressure.room1.office.mydomain.com

The flow URI must unequivocally identify a flow resource and provide, by means of DNS resolution mechanisms, all the information required to use the flow. Among these parameters, at least the following should be resolvable:

  • Event Queue Broker protocol utilized by the flow. For instance, if Apache Kafka is used, the protocol would be "kafka"; In case RabbitMQ is used by the flow, "amqp". Also, it must be informed if the protocol is protected by TLS.
  • Event Queue Broker FQDN or list of FQDNs that resolve to the IP address of one or a set of the Event Queue Brokers. For instance, kafka-1.mycompany.com, kafka-2.mycompany.com.
  • Event Queue Broker Port used by the Event Queue Brokers. For instance, in the case of Kafka: 9092, 9093.
  • Event Queue Broker Transport Security Layer can be implemented. Thus, it is needed to know if the connection uses TLS before establishing it.
  • Queue Name hosted in the Event Queue Broker, which must be equal to that of the corresponding flow name.

The general syntax of the Flow URI would be as follows:

flow://flowName.flowCategory.myNameSpace.domain.tld

  • Flow Namespace FQDN: myNameSpace.domain.tld
  • Flow Name: flowName.flowCategory
  • Flow FQDN: flowName.flowCategory.myNameSpace.domain.tld

The following are examples of this URI Syntax:

flow://notifications.calendar.people.syndeno.com

  • Flow Namespace FQDN: people.syndeno.com
  • Flow Name: notifications.calendar
  • Flow FQDN: notifications.calendar.people.syndeno.com

flow://created.invoice.finance.syndeno.com:

  • Flow Namespace FQDN: finance.syndeno.com
  • Flow Name: created.invoice
  • Flow FQDN: created.invoice.finance.syndeno.com
4.1.2.3. Flow name resolution

In Figure 4, we can see how a Flow FQDN can be resolved by means of the Flow Name Service.

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Figure 4: Figure 4

In order to illustrate the Flow Name resolution procedure by the FNAA (Flow Namespace Accessing Agent), we can consider the following flow URI:

flow://notifications.calendar.people.syndeno.com

First, the FNAA will perform a query to the DNS resolvers. These will perform a recursive DNS query to obtain the authoritative name servers for the Flow Namespace: people.syndeno.com. Thus, the authoritative name servers for syndeno.com will reply with one or more NS Resource Record containing the FQDN for the authoritative name servers of people.syndeno.com.

Secondly, once these name servers are obtained, the FNUA will perform a PTR query on the Flow FQDN adding a service discovery prefix. The response of the PTR query will return another FQDN compliant with SRV DNS Resource Records [RFC2782] and DNS Service Discovery [RFC6763].

In this case, the query for PTR records would be as follows: ~~~ ;; QUESTION SECTION: ;notifications.calendar.people.syndeno.com. IN PTR ~~~ The response would be in the following form: ~~~ ;; ANSWER SECTION: notifications.calendar.people.syndeno.com. 21600 IN PTR _flow._tcp.notifications.calendar.people.syndeno.com. ~~~ Using the FQDN returned by this query, an additional query asking for SRV records is made: ~~~ ;; QUESTION SECTION: ;_flow._tcp.notifications.calendar.people.syndeno.com. IN SRV

;; ANSWER SECTION: _flow._tcp.notifications.calendar.people.syndeno.com. 875 IN SRV 30 30 65432 fnaa.syndeno.com. _flow._tcp.notifications.calendar.people.syndeno.com. 875 IN TXT "tls"

_queue._flow._tcp.notifications.calendar.people.syndeno.com. 875 IN SRV 30 30 9092 kafka.syndeno.com. _queue._flow._tcp.notifications.calendar.people.syndeno.com. 875 IN TXT "broker-type=kafka tls" ~~~ First, the response informs the network location of the FNAA server, in this case a connection should be opened to TCP port 65432 of the IP resulting of resolving fnaa.syndeno.com: ~~~ ;; QUESTION SECTION: ;fnaa.syndeno.com. IN A

;; ANSWER SECTION: fnaa.syndeno.com. 21600 IN A 208.68.163.200 ~~~ Secondly, this response offers other relevant information, like the TCP port where the queue service is located (9092). It also includes a TXT Resource Record that establishes the protocol of the Event Queue Broker, defined in the variable "broker-type=kafka".

Now, using the returned FQDN for the queue, kafka.syndeno.com, the resolver can perform an additional query: ~~~ ;; QUESTION SECTION: ;kafka.syndeno.com. IN A

;; ANSWER SECTION: kafka.syndeno.com. 21600 IN A 208.68.163.218 ~~~

4.1.3. Flow Namespace Accessing Agent (FNAA)

The Flow Namespace Accessing Agent is the core component of a Network Participant. This server application implements the Flow Namespace Accessing Protocol that allows client connections.

In the diagram of Figure 5 we can see the different methods that the FNAA must support.

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Figure 5: Figure 5

The clients connecting to a FNAA server can be remote FNAA servers as well as FNUA. The rationale is that users of a NP connect to the FNAA by means of a FNUA. On the other hand, when a user triggers a new subscription creation, the FNAA of his NP must connect as client to a remote FNAA server.

4.1.4. Flow Processor (FP)

Whenever a new subscription creation is triggered and all remote flow connection details are obtained, the FNAA needs to set up a Processor for it. The communications of the FNAA to and from the FP is by means of an IPC interface. This means that there can be different implementations of Processors, one of which will be the Subscription Processor.

In the diagram of Figure 6, we can see the initial interface methods that should be implemented in a Flow Processor.

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Figure 6: Figure 6

Depending on the use of the processor, different data structures should be added to the different methods. In the case of a Subscription Processor, the minimum information will be the remote and local Flow connection details. Moreover, the interface also should include methods to update the Processor configuration and to destroy it, once a subscription is revoked. Finally, due to the nature of the stream communication, there could also be methods available to pause and to resume a Processor.

There can be different types of Processors, which we can see in Figure 7.

High-level overview of the IPC interface for the FNAA server and Flow Processors communications. image/svg+xml Print 2022-01-26T22:15:44+01:00 2022-01-26T22:15:44+01:00 2022-01-26T22:15:44+01:00 Adobe Illustrator 26.0 (Windows) 228 256 JPEG /9j/4AAQSkZJRgABAgEASABIAAD/7QAsUGhvdG9zaG9wIDMuMAA4QklNA+0AAAAAABAASAAAAAEA AQBIAAAAAQAB/+4ADkFkb2JlAGTAAAAAAf/bAIQABgQEBAUEBgUFBgkGBQYJCwgGBggLDAoKCwoK DBAMDAwMDAwQDA4PEA8ODBMTFBQTExwbGxscHx8fHx8fHx8fHwEHBwcNDA0YEBAYGhURFRofHx8f Hx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8fHx8f/8AAEQgBAADkAwER AAIRAQMRAf/EAaIAAAAHAQEBAQEAAAAAAAAAAAQFAwIGAQAHCAkKCwEAAgIDAQEBAQEAAAAAAAAA AQACAwQFBgcICQoLEAACAQMDAgQCBgcDBAIGAnMBAgMRBAAFIRIxQVEGE2EicYEUMpGhBxWxQiPB UtHhMxZi8CRygvElQzRTkqKyY3PCNUQnk6OzNhdUZHTD0uIIJoMJChgZhJRFRqS0VtNVKBry4/PE 1OT0ZXWFlaW1xdXl9WZ2hpamtsbW5vY3R1dnd4eXp7fH1+f3OEhYaHiImKi4yNjo+Ck5SVlpeYmZ qbnJ2en5KjpKWmp6ipqqusra6voRAAICAQIDBQUEBQYECAMDbQEAAhEDBCESMUEFURNhIgZxgZEy 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Figure 7: Figure 7

In Figure 7, we can see that there are different types of Flow Processors: * Bridge Processor: Consumes events from a Flow located in an Event Broker (i.e., Apache Kafka) and transcribes them to a single Flow (local or remote). * Collector Processor: Consumes events from N Flows located in an Event Broker and transcribes the aggregate to a single Flow (local or remote). * Distributor Processor: Consumes events from a single Flow and transcribes or broadcast to N Flows (local or remote). * Signal Processor: Consumes events from N Flows and produces new events to N Flows (local or remote)

To implement the previously described Subscription Processor, we can utilize some form of the Bridge Processor. Although we are initially considering the basic use case of subscription, it must be possible for the network to extend the processor types supported. In any case, the different FNAA servers involved must be aware the supported processor types, with the goal of informing the users the capabilities available in the FNAA server. For instance, the fact that a FNAA supports the Bridge Processor should enable the subscription commands in the FNAA, for users to create subscriptions using the Bridge Processor.

In summary, the IPC interface should support all the possible processors that the network may need although we are initially considering the subscription use case.

4.1.5. Flow Namespace User Agent (FNUA)

The FNUA is an application analogous to email clients such as Microsoft Office or Gmail. These applications implement either different network protocols to access mailboxes by means of IMAP and/or POP3. In the case of FNUA, the protocol implemented is the FNAP (Flow Namespace Accessing Protocol).

The FNUA is an application that acts as a client for the FNAA server. Only users that possess accounts in a Network Participant should be able to login to FNAA to manage Flow Namespaces. The FNUA could be any kind of user application: web application, desktop application, mobile application or even a cli tool.

In the Diagram of Figure 8 we can see the actions that the user can request to the FNUA.

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Figure 8: Figure 8

The main goal of the FNUA is to provide the user with access to Flow Namespaces and the flows hosted in them. A user may have many Flow Namespace and many Flows in each of them. By means of the FNUA, the user can manage the Flow Namespaces and the Flows in them. Also, the FNUA will provide the capabilities required to subscribe to external Flows, whether local to the FNAA, local to the NP or remote (in a different NP FNAA server).

4.2. Communications Examples

In this section, two usage examples of Network Participants communications are provided. The first one, we call unidirectional, since one NP subscribes to a remote Flow of a different NP. The second one, we call it bidirectional, since now these NP have mutual subscriptions.

4.2.1. Unidirectional Subscription

In the diagram of Figure 9, we can see an integration between two NP. In this case, there is a FlowA hosted in the Orange NP to which the FlowB in the Blue NP is subscribed. Both FlowA and FlowB count with a queue hosted in the Flow Events Broker, which could be an Apache Kafka instance for example. However, it must be possible to employ any Flow Events Broker of the NP's choice.

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Figure 9: Figure 9

The steps followed to set up a subscription to a remote flow are: 1. A user of the Blue NP creates a new subscription to remote FlowA by means of the Flow Namespace User Agent (FNUA). 2. The FNUA connects to the Flow Namespace Accessing Agent (FNAA) of the Blue NP to inform the user request. 3. The FNAA in the Blue NP discovers the remote FNAA to which it must connect to obtain the flow connection parameters. First, it needs to authenticate and, if allowed, the connection parameters will be returned. 4. Once the FNAA in the Blue NP has all the necessary information, it will set up a new Processor that connects the flow in the Orange NP to a flow in the Blue NP. 5. Once the subscription is brought up, every time a Producer in the Orange NP writes an event to FlowA, the Flow Processor will receive it, since it is subscribed to it. Then, the Flow Processor will write that event to FlowB in the Blue NP. 6. From now on, every Consumer connected to FlowB will receive the events published on FlowA.

In case the user owner of FlowA in the Orange NP wishes to revoke the access, it must be able to do so by means of security credentials revoking against the Identity & Access Manager of the Orange NP.

4.2.2. Bidirectional Subscription

In Figure 10 we can see an example of all the components needed to set up a flow integration between two different NP. In this case, there are two flows being connected: * FlowA of the Orange NP with FlowB of the Blue NP * FlowC of the Blue NP with FlowD of the Orange NP

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CMYK PROCESS 40.000000 65.000000 90.000000 35.000000 C=40 M=70 Y=100 K=50 CMYK PROCESS 40.000000 70.000000 100.000000 50.000000 C=50 M=70 Y=80 K=70 CMYK PROCESS 50.000000 70.000000 80.000000 70.000000 Grays 1 C=0 M=0 Y=0 K=100 CMYK PROCESS 0.000000 0.000000 0.000000 100.000000 C=0 M=0 Y=0 K=90 CMYK PROCESS 0.000000 0.000000 0.000000 89.999400 C=0 M=0 Y=0 K=80 CMYK PROCESS 0.000000 0.000000 0.000000 79.998800 C=0 M=0 Y=0 K=70 CMYK PROCESS 0.000000 0.000000 0.000000 69.999700 C=0 M=0 Y=0 K=60 CMYK PROCESS 0.000000 0.000000 0.000000 59.999100 C=0 M=0 Y=0 K=50 CMYK PROCESS 0.000000 0.000000 0.000000 50.000000 C=0 M=0 Y=0 K=40 CMYK PROCESS 0.000000 0.000000 0.000000 39.999400 C=0 M=0 Y=0 K=30 CMYK PROCESS 0.000000 0.000000 0.000000 29.998800 C=0 M=0 Y=0 K=20 CMYK PROCESS 0.000000 0.000000 0.000000 19.999700 C=0 M=0 Y=0 K=10 CMYK PROCESS 0.000000 0.000000 0.000000 9.999100 C=0 M=0 Y=0 K=5 CMYK PROCESS 0.000000 0.000000 0.000000 4.998800 Brights 1 C=0 M=100 Y=100 K=0 CMYK PROCESS 0.000000 100.000000 100.000000 0.000000 C=0 M=75 Y=100 K=0 CMYK PROCESS 0.000000 75.000000 100.000000 0.000000 C=0 M=10 Y=95 K=0 CMYK PROCESS 0.000000 10.000000 95.000000 0.000000 C=85 M=10 Y=100 K=0 CMYK PROCESS 85.000000 10.000000 100.000000 0.000000 C=100 M=90 Y=0 K=0 CMYK PROCESS 100.000000 90.000000 0.000000 0.000000 C=60 M=90 Y=0 K=0 CMYK PROCESS 60.000000 90.000000 0.003100 0.003100 Adobe PDF library 15.00
Figure 10: Figure 10

Each Flow has its corresponding Queue hosted in the NP Flow Events Broker. Also, there is one Flow Processor for each connection, meaning that these components are in charge of reading new events on source flows to write them to the destination flows as soon as received.

Also, we can see that in order to connect FlowB to FlowA, a connection from the Blue NP's FNAA has been initiated against the Orange NP's FNAA. This connection uses the FNAP to interchange the flow connection details. Analogously, the FNAA connection to set up the integration of FlowC with FlowD has been initiated by the Orange NP's FNAA.

After the flow connection details are obtained, the different Flow Processors are set up to consume and produce events from and to the corresponding Queue in the different NPs.

Once the two processors are initialized, all the events produced to FlowA in the Orange NP will be forwarded to FlowB in the Blue NP; and all the events produced to FlowC in the Blue NP will be forwarder to FlowD in the Orange NP.

5. Event Streaming Open Network Protocol

The protocol to be used in an Event Streaming Open Network is a key component of the overall architecture and design. This chapter is dedicated to thoroughly describe this protocol.

5.1. Protocol definition methodology

It is now necessary to specify the protocol needed for the Flow Namespace Accessing Agent or FNAA, which we have named the Flow Namespace Accessing Protocol or FNAP. In the diagram of Figure 11 we can see how an FNAA client connects with a FNAA server by means of the FNAP.

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Figure 11: Figure 11

In order to define a finite state machine for the protocol and the different stimuli that cause a change of state, the model presented by M.Wild (Wild, 2013) in her paper "Guided Merging of Sequence Diagrams" will be employed. This model is beneficial since it provides an integrated method both for client and server maintaining the stimuli relationship that trigger a change of state in each component.

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Figure 12: Figure 12

In Figure 12 we have the method proposed by Wild for SMTP, in which there are boxes representing states and arrows representing transitions. Each transition has a label composed of the originating stimulus that triggers the transition and a subsequent stimulus effect triggered by the transition itself. For instance, when a client connects to an SMTP Server, the client goes from "idle" state to "conPend" state. The label of this transition includes "uCon" as the stimulus triggering the transition, which triggers the effect "sCon". Then, on the diagram for the server we can see that the "sCon" triggers the transition from "waiting" state to "accepting" state in the server.

This method will be used to define the states and transitions for the Flow Namespace Accessing Protocol both for client and server.

5.2. Flow Namespace Accessing Protocol (FNAP)

Using the model proposed by Wild described previously, we define the finite-state machine for the FNAA Server, which we can see in Figure 13.

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Figure 13: Figure 13

The model in right side of Figure 13 shows that the FNAA server starts in a "waiting" state, which basically means that the server has successfully set up the networking requirements to accept client connections. Then, when a client connects, a transition is made to "accepting" state, in which internally the authentication procedure is made. If the authentication is successful, a transition is made to "ready" state, meaning that the client can now execute commands on the FNAA server.

For each command that the client executes, a transition is made to "cmdRecvd" state. Then, a response is returned to the client, transitioning again to "waiting" state. When the client executes the "Quit" command, a transition is made to the "waiting" state and the server must free all used networking resources for the now closed connection.

On the left side of Figure 13, we also have the client state machine with its corresponding transitions. The client triggers a connection to the server and once established, an authentication is needed. Once the authentication is correctly done, the client can start requesting commands to the server. For each command executed by the client, a transition is made to "cmdPend" state, until a response is returned by the server.

Eventually, a "Quit" command will be executed by the client and the connection will be closed.

5.3. Implementation

In this section, we provide an approach for the overall implementation of the proposed Event Streaming Open Network. Considering the components defined previously for the architecture, we will define which existing tools can be leveraged and those that require development.

5.3.1. Objectives

The objective of this implementation is to provide specifications for an initial implementation of the overall architecture for the Event Streaming Open Network. Whenever it is possible, existing tools should be leveraged. For those components that need development, a thorough specification is to be provided.

5.3.1.1. Implementation overview

In Figure 14, we have a diagram of the overall implementation proposal. The components that have the Kubernetes Deployment icon are the ones to be managed by the FNAA server instance. Then, we have a Kafka Cluster that provides a Topic instance for each flow. Finally, the DNS Infrastructure is leveraged.

Implementation overview using Kubernetes, Apache Kafka, DNS Bind9 and the Flow CLI tool.
Figure 14: Figure 14

5.4. Existing components

In this section, we describe the existing software components that can be leveraged for implementation.

5.4.1. Flow Events Broker (FEB)

Since there are currently many implementations for this component, it is necessary to develop the needed integrations of other components of the architecture to the main market leaders. Thus, we will consider the following Flow Events Broker for the implementation: Apache Kafka, AWS SQS and Google Compute PubSub.

In summary, this component does not need to be developed from scratch. However, the FNAA will need to be able to communicate with the different Flow Events Broker, meaning that it must implement their APIs as a client.

5.4.2. Flow Name Service (FN)

This component can be completely implemented by leveraging on the ISC Bind9 software component, which is the de facto leader for DNS servers. A given NP will need to deploy a Bind9 Nameserver and enable both DNSSEC and DNS Dynamic Update.

The impact of adopting Bind9 for the implementation means that the FNAA component needs to be able to use a remote DNS Server to manage the Flow URI registration, deregistration and execute recursive DNS resolution.

5.4.3. Components to be developed

In this section, we describe a set of tools that require development. These components, especially the FNAA, are the core components of every Network Participant. Moreover, these are the components that implement the network protocol FNAP.

Since these are the core components of the network, they are the natural candidates for validation. In the next chapter, we will show the feasibility of the core network components in the form of a Proof of Concept.

5.4.3.1. Flow Namespace Accessing Agent (FNAA)

The Flow Namespace Accessing Agent is a server component that triggers the creation of child processes that implement the different Flow Processors. This means that the instance running the FNAA will bring up new processes for each processor. One way of implementing this functionality can be a parent process that creates new child processes for each processor. However, this would imply the need of creating and managing different threads in a single FNAA instance.

The problem with the approach of a parent process and child processes for the FNAA is on the infrastructure level. The more processor a FNAA needs to manage, the more compute resources the FNAA would need. In the current cloud infrastructure context, this is problem because it means that additional compute resources should be assigned to the FNAA, depending on the quantity of processors and the required resources for each of them. In summary, this approach would be vertically scalable but not horizontally scalable.

Then, to avoid the scalability issue, the approach we propose is by implementing a Cloud Native application. By leveraging on Kubernetes, it is possible to trigger the creation of Deployments, which are composed of Pods. Each Pod can contain a given quantity of containers, which are processes running in a GNU/Linux Operating System. In this way, we can dedicate a Pod to run the FNAA server and different Pods to run the Processors. This approach provides a convenient process isolation and enables both horizontal and vertical scalability.

Moreover, the way in which the FNAA would bring up and manage Processor instances would be though an integration with the underlaying Kubernetes instance, by means of the Kubernetes API. The result is a Cloud Native application that leverages the power and flexibility of Kubernetes to manage the Processor instances.

On the other hand, the programming language for the FNAA must also be defined. For this, we consider that it must be possible to implement the FNAA and the Flow Processors in different programming languages. For the FNAP it is recommended to employ Golang, since Kubernetes CLI tool is implemented in this language and there are several libraries available for integration. As for the Flow Processors, it must be possible to use any programming language as long as the IPC interface is correctly implemented.

Regarding the IPC interface for the communications between the FNAA and the Flow Processors, the recommendation is to employ gRPC together with Protobuf. The rationale for choosing this this technology is the fact that gRPC enables binary communications, which are the desired type of communication for systems integration. Then, both the FNAA and the Flow Processors must share this Protobuf interface definition and implement it accordingly through gRPC.

Finally, the FNAA must implement the protocol we have named FNAP, which provides the main set of functionalities for the Event Streaming Open Network. The implementation of FNAP must be stateful, in the sense that it is connection-based. Additionally, the implementation must be text-based, with the goal that humans can interact with FNAA servers in the same way that it is possible for SMTP servers. The transport protocol must be TCP with no special definition for a port number, since the port should be able to be discovered by means of DNS SRV Resource Records.

Regarding security for the FNAA servers, TLS must be supported. This means that any client can start a TLS handshake with the FNAA servers before issuing any command.

In conclusion, the implementation of the FNAA over Kubernetes provides the needed flexibility and set of capabilities required for this component. It is recommended to implement the FNAA in Golang and enable the implementation of Flow Processors in any programming language as long as the Protobuf interface is correctly implemented. Finally, the FNAA must implement the protocol FNAP in a connection-based and text-based manner.

5.4.3.2. Flow Namespace User Agent (FNUA)

The Flow Namespace User Agent (FNUA) can have different implementations as long as they comply with the protocol FNAP.

We propose the initial availability of a CLI tool that acts as a Flow Namespace User Agent. This CLI tool must provide a client implementation of all the functionalities available in the FNAA server. Among the functionalities to be implemented as a must, we can mention: * Discover the FNAA server for a given Flow URI. * Connect to the FNAA server to manage Flow Namespaces and Flows, as exemplified in Figure 8.

Additionally, the FNUA should be able to discover the Authoritative FNAA server for a given Flow Namespace. This discovery shall be performed by leveraging on the DNS-SD specification. Refer to Annex D to review the discovery process.

Regarding the implementation of the CLI tool, it is recommended to employ Golang together with Cobra, a library specialized to create CLI tools. In Figure 15 we have a diagram that shows the different functionalities that the CLI tool should implement.

Flow CLI parameters diagram.
Figure 15: Figure 15

6. Proof of Concept

In this section, we will focus on providing a minimum implementation of the main Event Streaming Open Network component: the Flow Namespace Accessing Agent. This implementation should serve as a Proof of Concept of the overall Event Streaming Open Network proposal.

As described in the previous section, the Flow Namespace Accessing Agent (FNAA) is the main and core required component for the Open Network. All Network Participants must deploy an FNAA server instance in order to be part of the network. The FNAA actually implements a server-like application for the Flow Namespace Accessing Protocol (FNAP). Then, the first objective of this Proof of Concept is to show an initial implementation of the FNAA server component.

On the other hand, the FNAA is accessed by means of a Flow Namespace User Agent (FUA). This component acts as a client application that connects to a FNAA. Also, this component can take different forms: it could be a web-based application, a desktop application or even a command line tool. For the purposes of this Proof of Concept, we will implement a CLI tool that acts as a client application for the FNAA. Thus, the second objective of this PoC is to provide an initial implementation of the FNUA client component.

In the following sections, we will first describe the minimum functionalities considered for validating the overall proposal for the Event Streaming Open Network. This minimum set of requirements for both the FNAA and the FNUA will compose the Proof of Concept.

Afterwards, we will describe the technology chosen for the initial implementation of both the FNAA and the FNUA. Then, a description of how these tools work in isolation will be provided. Subsequently, we will review different use cases to prove how the network could be used by network participants and its users.

Lastly, we will provide a conclusion for this Proof of Concept, where we mentioning if and how the minimum established requirements have been met or not.

6.1. Minimum functionalities

Network Participants system administrators must be able to run a Server Application that acts as FNAA.

Users using a Client Application actiong as a FNUA must be able to: 1. Access the flow account and operate its flows. 2. Create a new flow. 3. Describe an existing flow. 4. Subscribe to an external flow.

6.2. FNAA - Server application

The FNAA server application must implement FNAP as described in Section 6. Basically, the FNAA will open a TCP port on all the IP addresses of the host to listen for new FNUA client connections.

The chosen language for the development of the FNAA is GoLang. The reason for choosing GoLang is because Kubernetes is written in this language and there is a robust set of libraries available for integration. Although there is no integration built with Kubernetes for this Proof of Concept, the usage of GoLang will enable a seamless evolution of the FNAA application. In future versions of the FNAA codebase, new functionalities leveraging Kubernetes will be easier to implement than if using a different programming language.

When the FNAA server application is initialized, it provides debug log messages describing all client interactions. In order to start the server application, a Network Participant system administrator can download the binary and execute it in a terminal:

ignatius ~ 0$./fnaad
server.go:146: Listen on [::]:61000
server.go:148: Accept a connection request.

Now that the 61000 TCP port is open, we can test the behaviour by means of a raw TCP using telnet command in a different terminal: ~~~ ignatius ~ 1$telnet localhost 61000 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 fnaa.unix.ar FNAA ~~~ We can now see that the server has provided the first message in the connection: a welcome message indicating its FQDN fnaa.unix.ar.

On the other hand, the server application starts providing debug information for the new connection established:

ignatius ~ 0$./fnaad
server.go:146: Listen on [::]:61000
server.go:148: Accept a connection request.
server.go:154: Handle incoming messages.
server.go:148: Accept a connection request.

6.3. FNUA - Client application

In order to test the FNAA server application, a CLI-based FNUA application has been developed. The chosen language for this CLI tool is also GoLang. The reason for choosing GoLang for the FNUA is because of its functionalities for building CLI tools, leveraging on the Cobra library. Thus, the FNUA for the PoC is an executable file that complies with the diagram in Figure 14.

One of the requirements for the flow CLI tool is a configuration file that defines the different FNAA servers together with the credentials to use. An example of this configuration file follows:

ignatius ~/ 0$cat .flow.yml
agents:
  -
    name: fnaa-unix
    fqdn: fnaa.unix.ar
    username: test
    password: test
    prefix: unix.ar-
  -
    name: fnaa-emiliano
    fqdn: fnaa.emiliano.ar
    username: test
    password: test
    prefix: emiliano.ar-

namespaces:
  -
    name: flows.unix.ar
    agent: fnaa-unix
  -
    name: flows.emiliano.ar
    agent: fnaa-emiliano

In this file, we can see that there are two FNAA instances described with FQDN fnaa.unix.ar and fnaa.emiliano.ar. Then, there are two namespaces: one called flow.unix.ar hosted on fnaa-unix and second namespace flows.emiliano.ar hosted on fnaa-emiliano. This configuration enables the FNUA to interact with two different FNAA, each of which is hosting different Flow Namespaces.

Once the configuration file has been saved, the flow CLI tool can now be used. In the following sections, we will show how to use the minimum functionalities required for the Open Network using this CLI tool.

6.4. Use cases

### Use case 1: Authenticating a user After the connection is established, the first command that the client must execute is the authentication command. As previously defined in Chapter 5, every FNAA client must first authenticate in order to execute commands. Thus, the authentication challenge must be supported both by the FNAA as well as the FNUA.

It is worth mentioning that the chosen authentication mechanism for this PoC is SASL Plain. This command can be extended furtherly with other mechanisms in later versions. However, this simple authentication mechanism is sufficient to demonstrate the authentication step in the FNAP.

The SASL Plain Authentication implies sending the username and the password encoded in Base64. The way to obtain the Base64 if we consider a user test with password test, is as follows:

ignatius ~ 0$echo -en "\0test\0test" | base64
AHRlc3QAdGVzdA==

Now, we can use this Base64 string to authenticate with the FNAA. First, we need to launch the FNAA server instance:

ignatius~/ $./fnaad --config ./fnaad_flow.unix.ar.yaml
main.go:41: Using config file: ./fnaad_flow.unix.ar.yaml
main.go:57:     Using config file: ./fnaad_flow.unix.ar.yaml
server.go:103: Listen on [::]:61000
server.go:105: Accept a connection request.

Then, we can connect to the TCP port in which the FNAA is listening:

ignatius ~ 1$telnet localhost 61000
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 fnaa.unix.ar FNAA
AUTHENTICATE PLAIN
220 OK
AHRlc3QAdGVzdA==
220 Authenticated

Once the client is authenticated, it can start executing FNAP commands to manage the Flow Namespace of the authenticated user. For simplicity purposes, in this Proof of Concept, we will be using a single user.

In the case of the CLI tool, there is no need to perform an authentication step, since every command the user executes will be preceded by an authentication in the server.

6.4.1. Use case 2: Creating a flow

Once the authentication is successful, the client can now create a new Flow. The way to do this using the CLI tool would be:

ignatius ~/ 0$./fnua create flow time.flow.unix.ar
Resolving SRV for fnaa.unix.ar. using server 172.17.0.2:53
Executing query fnaa.unix.ar. IN 33 using server 172.17.0.2:53
Executing successful: [fnaa.unix.ar.    604800  IN      SRV     0 0 61000 fnaa.unix.ar.]
Resolving A for fnaa.unix.ar. using server 172.17.0.2:53
Executing query fnaa.unix.ar. IN 1 using server 172.17.0.2:53
Executing successful: [fnaa.unix.ar.    604800  IN      A       127.0.0.1]
Resolved A to 127.0.0.1 for fnaa.unix.ar. using server 172.17.0.2:53
C: Connecting to 127.0.0.1:61000
C: Got a response: 220 fnaa.unix.ar FNAA
C: Sending command AUTHENTICATE PLAIN
C: Wrote (20 bytes written)
C: Got a response: 220 OK
C: Authentication string sent: AHRlc3QAdGVzdA==
C: Wrote (18 bytes written)
C: Got a response: 220 Authenticated
C: Sending command CREATE FLOW time.flow.unix.ar
C: Wrote (31 bytes written)
C: Server sent OK for command CREATE FLOW time.flow.unix.ar
C: Sending command QUIT
C: Wrote (6 bytes written)

The client has discovered the FNAA server for Flow Namespace flow.unix.ar by means of SRV DNS records. Thus, it obtained both the FQDN of the FNAA together with the TCP port where it is listening, in this case 61000. Once the resolution process ends, the FNUA connects to the FNAA. First, the FNUA authenticates with the FNAA and then it executes the create flow command.

If we were to simulate the same behavior using a raw TCP connection, the following steps would be executed: ~~~ ignatius ~ 1$telnet localhost 61000 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 fnaa.unix.ar FNAA AUTHENTICATE PLAIN 220 OK AHRlc3QAdGVzdA== 220 Authenticated CREATE FLOW time.flows.unix.ar 220 OK time.flows.unix.ar ~~~

Now, the client has created a new flow called time.flows.unix.ar located in the flows.unix.ar namespace. The FNAA in background has created a Kafka Topic as well as the necessary DNS entries for name resolution.

6.4.2. Use case 3: Describing a flow

Once a flow has been created, we can obtain information of if by executing the following command using the CLI tool:

ignatius ~/ 1$./fnua describe flow time.flow.unix.ar
Resolving SRV for fnaa.unix.ar. using server 172.17.0.2:53
Executing query fnaa.unix.ar. IN 33 using server 172.17.0.2:53
Executing successful: [fnaa.unix.ar.    604800  IN      SRV     0 0 61000 fnaa.unix.ar.]
Nameserver to be used: 172.17.0.2
Resolving A for fnaa.unix.ar. using server 172.17.0.2:53
Executing query fnaa.unix.ar. IN 1 using server 172.17.0.2:53
Executing successful: [fnaa.unix.ar.    604800  IN      A       127.0.0.1]
Resolved A to 127.0.0.1 for fnaa.unix.ar. using server 172.17.0.2:53
C: Connecting to 127.0.0.1:61000
C: Got a response: 220 fnaa.unix.ar FNAA
C: Sending command AUTHENTICATE PLAIN
C: Wrote (20 bytes written)
C: Got a response: 220 OK
C: Authentication string sent: AHRlc3QAdGVzdA==
C: Wrote (18 bytes written)
C: Got a response: 220 Authenticated
C: Sending command DESCRIBE FLOW time.flow.unix.ar
C: Wrote (33 bytes written)
C: Server sent OK for command DESCRIBE FLOW time.flow.unix.ar
Flow time.flow.unix.ar description:
flow=time.flow.unix.ar
type=kafka
topic=time.flow.unix.ar
server=kf1.unix.ar:9092
Flow time.flow.unix.ar described successfully
Quitting
C: Sending command QUIT
C: Wrote (6 bytes written)

In the output of the describe command we can see all the necessary information to connect to the Flow called time.flow.unix.ar: (i) the type of Event Broker is Kafka, (ii) the Kafka topic has the same name of the flow and (iii) the Kafka Bootstrap server with port is provided. If we were to obtain this information using a manual connection, the steps would be:

ignatius ~ 1$telnet localhost 61000
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 fnaa.unix.ar FNAA
AUTHENTICATE PLAIN
220 OK
AHRlc3QAdGVzdA==
220 Authenticated
DESCRIBE FLOW time.flows.unix.ar
220 DATA
flow=time.flows.unix.ar
type=kafka
topic=time.flows.unix.ar
server=kf1.unix.ar:9092
220 OK

Now, we can use this information to connect to the Kafka topic and start producing or consuming events.

6.4.3. Use case 4: Subscribing to a remote flow

In this section, we will show how a subscription can be set up. When a user commands the FNAA to create a new subscription to a remote Flow, the local FNAA server first needs to discover the remote FNAA server. Once the server is discovered by means of DNS resolution, the local FNAA contacts the remote FNAA, authenticates the user and then executes a subscription command.

Thus, the initial communication between the FNUA and the FNAA, in which the user indicates to subscribe to a remote flow, would be as follows: ~~~ ignatius ~ 1$telnet localhost 61000 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 fnaa.unix.ar FNAA AUTHENTICATE PLAIN 220 OK AHRlc3QAdGVzdA== 220 Authenticated SUBSCRIBE time.flows.unix.ar LOCAL emiliano.ar-time.flows.unix.ar 220 DATA ksdj898.time.flows.unix.ar 220 OK ~~~

Once the user is authenticated, a SUBSCRIBE command is executed. This command indicates first the remote flow to subscribe to. Then, it also specifies with LOCAL the flow where the remote events will be written. In this example, the remote flow to subscribe to is time.flows.unix.ar, and the local flow is emiliano.ar-time.flows.unix.ar. Basically, a new flow has been created, emiliano.ar-time.flows.unix.ar, where all the events of flow time.flows.unix.ar will be written.

The server answers back with a new Flow URI, in this case ksdj898.time.flows.unix.ar. This Flow URI indicates a copy of the original flow time.flows.unix.ar created for this subscription. Thus, the remote FNAA has full control over this subscription, being able to revoke it by simply deleting this flow or applying Quality of Service rules.

The remote FNAA has set up a Bridge Processor to transcribe messages in topic time.flows.unix.ar to the new topic ksdj898.time.flows.unix.ar. Another alternative to a Bridge Processor would be a Distributor Processor, which could be optimized for a Flow with high demand. Moreover, instead of creating a single Bridge Processor per subscription, a Distributor Processor could be used, in order to have a single consumer of the source flow and write the events to several subscription flows.

The user could use the FNUA CLI tool to execute this command in the following manner:

ignatius ~ 0$./fnua --config=./flow.yml subscribe time.flows.unix.ar --nameserver 172.17.0.2 -d --agent fnaa-emiliano
Initializing initConfig
    Using config file: ./flow.yml
Subscribe to flow
Agent selected: fnaa-emiliano
Resolving FNAA FQDN fnaa.emiliano.ar
Starting FQDN resolution with 172.17.0.2
Resolving SRV for fnaa.emiliano.ar. using server 172.17.0.2:53
Executing query fnaa.emiliano.ar. IN 33 using server 172.17.0.2:53
FNAA FQDN Resolved to fnaa.emiliano.ar. port 51000
Resolving A for fnaa.emiliano.ar. using server 172.17.0.2:53
Resolved A to 127.0.0.1 for fnaa.emiliano.ar. using server 172.17.0.2:53
C: Connecting to 127.0.0.1:51000
C: Got a response: 220 fnaa.unix.ar FNAA
Connected to FNAA
Authenticating with PLAIN mechanism
C: Sending command AUTHENTICATE PLAIN
C: Wrote (20 bytes written)
C: Got a response: 220 OK
C: Authentication string sent: AHRlc3QAdGVzdA==
C: Wrote (18 bytes written)
C: Got a response: 220 Authenticated
Authenticated
Executing command SUBSCRIBE time.flows.unix.ar LOCAL emiliano.ar-time.flows.unix.ar
C: Sending command SUBSCRIBE time.flows.unix.ar LOCAL emiliano.ar-time.flows.unix.ar
C: Wrote (67 bytes written)
C: Server sent OK for command SUBSCRIBE time.flows.unix.ar LOCAL emiliano.ar-time.flows.unix.ar
Flow emiliano.ar-time.flows.unix.ar subscription created successfully
Server responded: emiliano.ar-time.flows.unix.ar SUBSCRIBED TO ksdj898.time.flows.unix.ar
Quitting
C: Sending command QUIT
C: Wrote (6 bytes written)
Connection closed

This interaction of the FNUA with the FNAA of the Flow Namespace emiliano.ar (fnaa-emiliano) has trigger an interaction with the FNAA of unix.ar Flow Namespace (fnaa-unix). This means that before fnaa-emiliano was able to respond to the FNUA, a new connection was opened to the remote FNAA and the SUBSCRIBE command was executed.

The log of fnaa-emiliano when the SUBCRIBE command was issued looks as follows:

server.go:111: Handle incoming messages.
server.go:105: Accept a connection request.
server.go:253: User authenticated
server.go:347: FULL COMMAND: SUBSCRIBE time.flows.unix.ar LOCAL emiliano.ar-time.flows.unix.ar
server.go:401: Flow is REMOTE
client.go:280: **#Resolving SRV for time.flows.unix.ar. using server 172.17.0.2:53
server.go:417: FNAA FQDN Resolved to fnaa.unix.ar. port 61000
client.go:42: C: Connecting to 127.0.0.1:61000
client.go:69: C: Got a response: 220 fnaa.unix.ar FNAA
server.go:435: Connected to FNAA
server.go:436: Authenticating with PLAIN mechanism
client.go:126: C: Sending command AUTHENTICATE PLAIN
client.go:133: C: Wrote (20 bytes written)
client.go:144: C: Got a response: 220 OK
client.go:154: C: Authentication string sent: AHRlc3QAdGVzdA==
client.go:159: C: Wrote (18 bytes written)
client.go:170: C: Got a response: 220 Authenticated
server.go:444: Authenticated
client.go:82: C: Sending command SUBSCRIBE time.flows.unix.ar
client.go:88: C: Wrote (30 bytes written)
client.go:112: C: Server sent OK for command SUBSCRIBE time.flows.unix.ar
server.go:456: Flow time.flows.unix.ar subscribed successfully
server.go:457: Server responded: ksdj898.time.flows.unix.ar
server.go:459: Quitting

We can see how fnaa-emiliano had to trigger a client subroutine to contact the remote fnaa-unix. Once the server FQDN, IP and Port is discovered by means of DNS, a new connection is established and the SUBSCRIBE command is issued. Here we can see the log of fnaa-unix:

server.go:111: Handle incoming messages.
server.go:105: Accept a connection request.
server.go:253: User authenticated
server.go:139: Received command: subscribe
server.go:348: [SUBSCRIBE time.flows.unix.ar]
server.go:367: Creating flow endpoint time.flows.unix.ar
server.go:368: Creating new topic ksdj898.time.flows.unix.ar in Apache Kafka instance kafka_local
server.go:369: Creating Flow Processor src=time.flows.unix.ar dst=ksdj898.time.flows.unix.ar
server.go:370: Adding DNS Records for ksdj898.time.flows.unix.ar
server.go:372: Flow enabled ksdj898.time.flows.unix.ar
server.go:139: Received command: quit

Thus, we were able to set up a new subscription in fnaa-emiliano that trigger a background interaction with fnaa-unix.

6.5. Results of the PoC

We can confirm the feasibility of the overall Event Streaming Open Network architecture. The test of the proposed protocol FNAP and its implementation, both in the FNAA and FNUA (CLI application), show that the architecture can be employed for the purpose of distributed subscription management among Network Participants.

The minimum functionalities defined both for the Network Participants and the Users were met. Network Participants can run this type of service by means of a server application, the FNAA server. Also, the CLI-tool resulted in a convenient low-level method to interact with a FNAA server.

In further implementations, the server application should be optimized as well as secured, for instance with a TLS handshake. Also, the CLI-tool could be enhanced by a web-based application with a friendly user interface.

Nevertheless, the challenge for a stable implementation of both components is the possibility of supporting different Event Brokers and their evolution. Not only Apache Kafka should be supported but also the main Public Cloud providers events solutions, such as AWS SQS or Google Cloud Pub/Sub. Since the Event Brokers are continuously evolving, the implementation of the FNAA component should keep up both with the API and new functionalities of these vendors.

Regarding the protocol design, it would be needed to enhance the serialization of the exchanged data. In this sense, it could be convenient to define a packet header for the overall interaction between the FNAA both with remote FNAA as well as with FNUA.

Regarding the subscription use case, it would be necessary to establish a convenient format for the server response. Currently, the server is returning a key/value structure with the details of the Flow. This structure may not be the most adequate, since it may differ depending on the Event Broker used.

Also, the security aspect needs further analysis and design since its fragility could lead to great economical damage for organizations. Thus, it would be recommended to review the different security controls needed for this solution as part of an Information Security Management System.

Finally, the implementation should leverage the Cloud Native functionalities provided by the Kubernetes API. For example, the FNAA should trigger the deployment of Flow Processors on demand, in order to provide isolated computing resources for each subscription. Also, a Kubernetes resource could be developed to use the kubectl CLI tool for management, instead of a custom CLI tool.

7. Summary & Conclusions

In this chapter we will provide a summary of everything that has been described in this document as well as some conclusions about it.

We have identified a use case for which there is currently no adequate solution provided by existing tools. This use case is based on the cross-organization integration of real-time event streams. Nowadays, organizations intending to integrate these kind of data streams struggle with offline communication to achieve a common interface for integration. In this context, we proposed an Open Network for Event Streaming as a possible solution for this difficulty.

For this Open Network, we have followed the main necessities from the technical perspective. While there already exist many components that can be leveraged, some components require analysis, design, and implementation. Then, we referred to the Commons Infrastructure literature in order to show how Event Streaming can be considered an Infrastructure Resource that can enable downstream productive activities. Finally, we established the main guidelines that an Open Network should follow, basing these definitions on Free, Open & Neutral Networks.

Using the previous definitions, we have designed an architecture for the Event Streaming Open Network, establishing the components that the different Network Participants should implement in order to participate in the network. After providing a thorough description of all the components, we showed some use cases of integration among different Network Participants.

Once the architecture was defined, we proposed an implementation approach which describes the existing components that can be leveraged as well as those that need to be developed from scratch. The outcome was that a server-side application called FNAA had to be developed. This application implements the protocol FNAP and can be accessed by a client application, which we named FNUA.

Finally, we proved the feasibility of the proposed architecture by providing an implementation of the minimum functionalities required, in the form of a Proof of Concept. The results of this PoC were encouraging since it was possible to implement the initial functionalities for the FNAA and FNUA components.

As conclusion, we can mention that there is great potential for an Open Network for Event Streaming among organizations. In the same way the email infrastructure acts as an open network for electronic communications among people, this kind of network would enable developers to integrate real-time event streams while minimizing offline agreement of interfaces and technologies.

However, there are many difficulties that could be furtherly worked on. First, a robust implementation for the Event Streaming Open Network main components must be provided, mainly for the FNAA and FNUA. In order to achieve an acceptable level of quality and stability, the development of a community around the project is needed.

Secondly, we found that the proposed architecture is a convenient starting point. However, it can suffer modifications based on the learning process during the implementation. For example, while designing the architecture, we avoided the need of a database for the FNAA component, leveraging on the DNS infrastructure. While this can be sufficient for the minimum functionalities described, it will most probably be necessary for the FNAA to persist data in a database of its own. In this sense, we believe that leveraging the Kubernetes resources model could be a convenient alternative.

Thirdly, during the PoC execution, we identified some difficulties implementing the security functionalities of authentication and authorization. Although we were able to implement an authentication mechanism, the reality indicates that integration with well-established protocols is needed (i.e., OAuth, GSSAPI, etc.).

Finally, there is also the need to leverage on the Cloud Native architecture, basically Kubernetes, to provide hyper-scalability and enable Network Participants to agnostically choose the underlaying infrastructure. The selection of Golang for the PoC implementation showed to be convenient, given the vast number of available libraries for integration of third-party components and services.

Notwithstanding the difficulties, we firmly believe that cross-organization real-time event integration can provide great benefits for society. It would enhance the efficiency of business processes throughout organizations. Also, it would provide broad visibility to the final users, enabling experimentation and entrepreneurship. New business models for existing productive activities could be developed, as well as enabling innovation, which in turn would conform the positive externalities of the Event Streaming Open Network.

8. Security Considerations

TODO Security

9. IANA Considerations

This document has no IANA actions.

10. Normative References

[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/rfc/rfc2119>.
[RFC2782]
Gulbrandsen, A., Vixie, P., and L. Esibov, "A DNS RR for specifying the location of services (DNS SRV)", RFC 2782, DOI 10.17487/RFC2782, , <https://www.rfc-editor.org/rfc/rfc2782>.
[RFC3261]
Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, DOI 10.17487/RFC3261, , <https://www.rfc-editor.org/rfc/rfc3261>.
[RFC5321]
Klensin, J., "Simple Mail Transfer Protocol", RFC 5321, DOI 10.17487/RFC5321, , <https://www.rfc-editor.org/rfc/rfc5321>.
[RFC6763]
Cheshire, S. and M. Krochmal, "DNS-Based Service Discovery", RFC 6763, DOI 10.17487/RFC6763, , <https://www.rfc-editor.org/rfc/rfc6763>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/rfc/rfc8174>.

Acknowledgments

SPINELLA E. (2022) [Online] Event Streaming Open Network Master's Thesis https://drive.google.com/file/d/1R9H-4knAztez_yUPlr7aZSkbUjs8jL3j

URQUHART J. (2021) Flow Architectures

FRISCHMANN B. (2007) [Online] Infrastructure Commons in Economic Perspective < https://firstmonday.org/article/view/1901/1783>

WIDL M. (2013), Guided Merging of Sequence Diagrams

NAVARRO L. (2018) [Online] Network Infrastructures: The commons model for local participation, governance and sustainability https://www.apc.org/en/pubs/network-infrastructures-commons-model-local-participation-governance-and-sustainability

BRINO A. (2019) Towards an Event Streaming Service for ATLAS data processing.

GUTTRIDGE, Gartner (2021) "Modern Data Strategies for the Real-time Enterprise" Big Data Quarterly 2021

Author's Address

Emiliano Spinella
Syndeno

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