Nginx Push Stream Module

A pure stream http push technology for your Nginx setup.

Comet made easy and really scalable.

Supports EventSource, WebSocket, Long Polling, and Forever Iframe. See some examples bellow.

This module is not distributed with the Nginx source. See the installation instructions.

Available on github at nginx_push_stream_module

Changelog

Always take a look at CHANGELOG.textile to see what’s new.

Contribute

After you try this module and like it, feel free to give something back, and help in the maintenance of the project ;)

Status

This module is considered production ready.

Basic Configuration

    # add the push_stream_shared_memory_size to your http context
    http {
       push_stream_shared_memory_size 32M;

        # define publisher and subscriber endpoints in your server context
        server {
           location /channels-stats {
                # activate channels statistics mode for this location
                push_stream_channels_statistics;

                # query string based channel id
                push_stream_channels_path               $arg_id;
            }

            location /pub {
               # activate publisher (admin) mode for this location
               push_stream_publisher admin;

                # query string based channel id
                push_stream_channels_path               $arg_id;
            }

            location ~ /sub/(.*) {
                # activate subscriber (streaming) mode for this location
                push_stream_subscriber;

                # positional channel path
                push_stream_channels_path                   $1;
            }
        }
    }

Basic Usage

You can feel the flavor right now at the command line. Try using more than
one terminal and start playing http pubsub:

    # Subs
    curl -s -v --no-buffer 'http://localhost/sub/my_channel_1'
    curl -s -v --no-buffer 'http://localhost/sub/your_channel_1'
    curl -s -v --no-buffer 'http://localhost/sub/your_channel_2'

    # Pubs
    curl -s -v -X POST 'http://localhost/pub?id=my_channel_1' -d 'Hello World!'
    curl -s -v -X POST 'http://localhost/pub?id=your_channel_1' -d 'Hi everybody!'
    curl -s -v -X POST 'http://localhost/pub?id=your_channel_2' -d 'Goodbye!'

    # Channels Stats for publisher (json format)
    curl -s -v 'http://localhost/pub?id=my_channel_1'

    # All Channels Stats summarized (json format)
    curl -s -v 'http://localhost/channels-stats'

    # All Channels Stats detailed (json format)
    curl -s -v 'http://localhost/channels-stats?id=ALL'

    # Prefixed Channels Stats detailed (json format)
    curl -s -v 'http://localhost/channels-stats?id=your_channel_*'

    # Channels Stats (json format)
    curl -s -v 'http://localhost/channels-stats?id=my_channel_1'

    # Delete Channels
    curl -s -v -X DELETE 'http://localhost/pub?id=my_channel_1'

Some Examples 

• Curl examples
• Forever (hidden) iFrame
• Event Source
• WebSocket
• Long Polling
• JSONP
• M-JPEG
• Other examples

FAQ 

Doubts?! Check the FAQ.

Bug report 

To report a bug, please provide the following information when applicable

1. Which push stream module version is been used (commit sha1)?
2. Which nginx version is been used?
3. Nginx configuration in use
4. “nginx -V” command outuput
5. Core dump indicating a failure on the module code. Check here how to produce one.
6. Step by step description to reproduce the error.

Who is using the module? 

Do you use this module? Put your name on the list.

Javascript Client 

There is a javascript client implementation here, which is framework independent. Try and help improve it. ;)

Directives

(1) Defining locations, (2) Main configuration, (3) Subscribers configuration, (4) Publishers configuration, (5) Channels Statistics configuration, (6) WebSocket configuration

Installation 

    # clone the project
    git clone https://github.com/wandenberg/nginx-push-stream-module.git
    NGINX_PUSH_STREAM_MODULE_PATH=$PWD/nginx-push-stream-module

    # get desired nginx version (works with 1.2.0+)
    wget http://nginx.org/download/nginx-1.2.0.tar.gz

    # unpack, configure and build
    tar xzvf nginx-1.2.0.tar.gz
    cd nginx-1.2.0
    ./configure --add-module=../nginx-push-stream-module
    make

    # install and finish
    sudo make install

    # check
    sudo /usr/local/nginx/sbin/nginx -v
        nginx version: nginx/1.2.0

    # test configuration
    sudo /usr/local/nginx/sbin/nginx -c $NGINX_PUSH_STREAM_MODULE_PATH/misc/nginx.conf -t
        the configuration file $NGINX_PUSH_STREAM_MODULE_PATH/misc/nginx.conf syntax is ok
        configuration file $NGINX_PUSH_STREAM_MODULE_PATH/misc/nginx.conf test is successful

    # run
    sudo /usr/local/nginx/sbin/nginx -c $NGINX_PUSH_STREAM_MODULE_PATH/misc/nginx.conf

Memory usage

Just as information is listed below the minimum amount of memory used for each object:

• message on shared = 200 bytes
• channel on shared = 270 bytes
• subscriber
  • on shared = 160 bytes
  • on system = 6550 bytes

Tests

The server tests for this module are written in Ruby, and are acceptance tests, click here for more details.

Discussion

Nginx Push Stream Module Discussion Group

Contributors