nexus

module

v2.0.3+incompatible Latest Latest Go to latest Published: May 15, 2018 License: MIT

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Repository

github.com/embeddedenterprises/nexus

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README ¶

WAMP v2 router library, client library and router service

nexus is a WAMP v2 router library, client library, and a router service, that implements most of the features defined in the advanced profile. The nexus project is written in Go and designed for highly concurrent asynchronous I/O. The nexus router provides extended functionality. The router and client interoperate with other WAMP implementations.

Full Documentation

See the nexus project Wiki for full documentation, examples, and operational details.

For the API:

What is WAMP and nexus

The Web Application Messaging Protocol (WAMP) is an open standard WebSocket subprotocol that provides two application messaging patterns in one unified protocol: Remote Procedure Calls and Publish & Subscribe

Using WAMP you can build distributed systems out of application components which are loosely coupled and communicate in (soft) real-time.

Nexus is a software package that provides a WAMP router library, client library, and stand-alone WAMP router service. This nexus package provides a messaging system for building distributed applications and services. Endpoints using websockets, TCP sockets, Unix sockets, and in-process connections may all communicate with eachother via pub/sub and routed RPC messaging.

The router library can be used to build custom WAMP routers or to embed a WAMP router in an application.
The client library can be used to build clients that connect to any WAMP server, or to communicate in-process with a WAMP router embedded in the same application.
The router service can be run as-is to provide WAMP routing.

Nexus Features

Concurrent Asynchronous I/O Nexus supports large numbers of clients concurrently sending and receiving messages, and never blocks on I/O, even if a client becomes unresponsive. See Router Concurrency for details.
WAMP Advanced Profile Features This project implements most of the advanced profile features in WAMP v2. See current feature support provided by nexus. Nexus also offers extended functionality for retrieving session information and for message filtering, giving clients more ability to decide where to send messages.
Flexibility Multiple transports and serialization options are supported, and more are being developed to maximize interoperability. Currently nexus provides websocket, rawsocket (tcp and unix), and local (in-process) transports. JSON, MessagePack, and CBOR serialization is available over websockets and rawsockets.
Security TLS is available over websockets and rawsockets with client and server APIs that allow configuration of TLS. The nexus router library also provides interfaces for integration of client authentication and authorization logic.

Quick Start

Installation

go get github.com/gammazero/nexus

Build, Configure, and Run Router Service

cd nexusd
go build
vi etc/nexus.json
./nexusd

Examples

Look at the examples to see how to create simple clients and servers. Examples of using advanced profile features are available in the full documentation.

https://github.com/gammazero/nexus/tree/master/examples

Contributing

Please read the Contributing guide if you are interested in becoming a contributor to this project.

Status

A stable release of nexus is available with support for most advanced profile features. Nexus is in active development, to add remaining advanced profile features, examples, automated tests, and documentation.

TODO

These features listed here are being added. If there are are specific items needed, or if any changes in current functionality are needed, then please open an issue.

more stress tests and benchmarks
more documentation
more advanced profile examples
testament_meta_api
event history
call trust levels
publisher trust levels

Advanced Profile Feature Support

RPC Features

Feature	Supported
progressive_call_results	Yes
progressive_calls	No
call_timeout	Yes
call_canceling	Yes
caller_identification	Yes
call_trustlevels	No
registration_meta_api	Yes
pattern_based_registration	Yes
shared_registration	Yes
sharded_registration	No
registration_revocation	No
procedure_reflection	No

PubSub Features

Feature	Supported
subscriber_blackwhite_listing	Yes
publisher_exclusion	Yes
publisher_identification	Yes
publication_trustlevels	No
subscription_meta_api	Yes
pattern_based_subscription	Yes
sharded_subscription	No
event_history	No
topic_reflection	No

Other Advanced Features

Feature	Supported
challenge-response authentication	Yes
cookie authentication	Yes
ticket authentication	Yes
rawsocket transport	Yes
batched WS transport	No
longpoll transport	No
session meta api	Yes
TLS for websockets	Yes
TLS for rawsockets	Yes
websocket compression	Yes

Extended Functionality

Nexus provides extended functionality around subscriber black/white listing and in the information available via the session meta API. This enhances the ability of clients to make desisions about message recipients.

Directories ¶

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Path	Synopsis
aat Package AAT is a collection of Automated Acceptance Tests.	Package AAT is a collection of Automated Acceptance Tests.
client Package client provides a WAMP client implementation that is interoperable with any standard WAMP router and is capable of using all of the advanced profile features supported by the nexus WAMP router.	Package client provides a WAMP client implementation that is interoperable with any standard WAMP router and is capable of using all of the advanced profile features supported by the nexus WAMP router.
examples
newclient Package newclient provides a function to create a new client with the socket type and serialization specified by command like arguments.	Package newclient provides a function to create a new client with the socket type and serialization specified by command like arguments.
pubsub/publisher
pubsub/subscriber
rpc/callee
rpc/caller
rpc/server_embedded_callee
server Example nexus WAMP router that handles websockets (with/out TLS), TCP rawsockets (with/out TLS), and unix rawsockets.	Example nexus WAMP router that handles websockets (with/out TLS), TCP rawsockets (with/out TLS), and unix rawsockets.
simple Simple example nexus WAMP router that handles websockets.	Simple example nexus WAMP router that handles websockets.
simple/pub
simple/sub
nexusd Stand-alone nexus router service.	Stand-alone nexus router service.
wsutil Package wsutil provides websocket server utilities.	Package wsutil provides websocket server utilities.
router Package router provides a WAMP router implementation that supports most of the WAMP advanced profile, offers multiple transports and TLS, and extends publication filtering functionality.	Package router provides a WAMP router implementation that supports most of the WAMP advanced profile, offers multiple transports and TLS, and extends publication filtering functionality.
auth Package auth provides interfaces for implementing authentication logic that the WAMP router can use.	Package auth provides interfaces for implementing authentication logic that the WAMP router can use.
stdlog Package stdlog provides a minimal logging interface to allow nexus to use nearly any logging implementation.	Package stdlog provides a minimal logging interface to allow nexus to use nearly any logging implementation.
transport Package transport provides a websocket, rawsocket, and local transport implementation.	Package transport provides a websocket, rawsocket, and local transport implementation.
serialize Package serialize provides a Serializer interface with implementations that encode and decode message data in various ways.	Package serialize provides a Serializer interface with implementations that encode and decode message data in various ways.
wamp Package wamp defines all message types, data types, and reserved URI values defined by the WAMP specification.	Package wamp defines all message types, data types, and reserved URI values defined by the WAMP specification.
crsign Package crsign provides functionality for signing challenge data in challenge-response authentication.	Package crsign provides functionality for signing challenge data in challenge-response authentication.