pushcart

Pushcart is a small HTTP-service for distributing messages from one or more producer applications to various client consumers.

Install

In addition to installing MongoDB and Redis, install Pushcart from NPM:

$ npm install -g pushcart

Server

$ pushcart server

The Pushcart server is configured via a number of environment variables:

• PORT
• MONGODB_URI
• REDIS_URI
• AUTH_TOKEN

Applications

Message producers are referred to as "applications" and must be registered with Pushcart:

$ pushcart addapp
Name: My App

OK
id: 519f9471fb85da32f7000001
token: eac3538e-07d3-485f-82a5-6e0e78866cc8

Applications can then create messages by POST-ing to /messages and providing the app token:

POST /messages HTTP/1.1
Host: mypushcartserver.com
Content-Type: application/json
X-App-Token: eac3538e-07d3-485f-82a5-6e0e78866cc8

{ "hello": "world" }

Clients

Message consumers are referred to as "clients" and must also be registered with Pushcart. The client program can register itself by POST-ing to /clients:

POST /clients HTTP/1.1
Host: mypushcartserver.com
Content-Type: application/json
X-Auth-Token: secret

{ "type": "test" }

Example response:

{
    "_id": "...",
    "type": "test",
    "token": "13c5287d-4801-41ec-98d6-8ef986e3adfe"
}

Clients should store the client token in order to consume messages.

Messages

Messages can be consumed in bulk by GET-ing /messages:

GET /messages HTTP/1.1
Host: mypushcartserver.com
X-Client-Token: 13c5287d-4801-41ec-98d6-8ef986e3adfe

Example response:

[
    {
        "_id": "519f713c22744d85d8000001",
        "hello": "world",
        "app": {
            "_id": "519f6c5cfb650fdbc6000001",
            "name": "My App"
        }
    },
    ...
]

Clients can also fetch only those messages created after a particular _id by sepcifying a since query string parameter:

GET /messages?since=519f713c22744d85d8000001 HTTP/1.1
Host: mypushcartserver.com
X-Client-Token: 13c5287d-4801-41ec-98d6-8ef986e3adfe

Pubsub

Messages are published to Redis when created. Other applications can listen for these messages by subscribing to the pushcart:messages channel:

$ redis-cli
$ subscribe pushcart:messages

Test

$ npm test