rsmq

A really simple message queue based on Redis

Redis Simple Message Queue

A lightweight message queue for Node.js that requires no dedicated queue server. Just a Redis server.

tl;dr: If you run a Redis server and currently use Amazon SQS or a similar message queue you might as well use this fast little replacement. Using a shared Redis server multiple Node.js processes can send / receive messages.

  • Lightweight: Just Redis and ~500 lines of javascript.
  • Guaranteed delivery of a message to exactly one recipient within a messages visibility timeout.
  • Received messages that are not deleted will reappear after the visibility timeout.
  • Test coverage
  • Similar to Amazon SQS - with some differences:
    • No ReceiptHandle. A message is deleted by the message id. The message id is returned by the sendMessage and receiveMessage method.
    • No MessageRetentionPeriod: Messages stay in the queue unless deleted.
    • No bulk operations (SendMessageBatch, DeleteMessageBatch).
    • Some SQS specific features are missing.
  • Optional RESTful interface via rest-rsmq
  • After creating a queue you can send messages to that queue.
  • The messages will be handled in a FIFO (first in first out) manner unless specified with a delay.
  • Every message has a unique id that you can use to delete the message.
  • The sendMessage method will return the id for a sent message.
  • The receiveMessage method will return an id along with the message and some stats.
  • Should you not delete the message it will be eligible to be received again after the visibility timeout is reached.
  • Please have a look at the createQueue and receiveMessage methods described below for optional parameters like visibility timeout and delay.

npm install rsmq

s

RedisSMQ = require("rsmq");
rsmq = new RedisSMQ( {host: "127.0.0.1", port: 6379, ns: "rsmq"} );

Parameters for RedisSMQ via an options object:

  • host (String): optional (Default: "127.0.0.1") The Redis server
  • port (Number): optional (Default: 6379) The Redis port
  • options (Object): optional (Default: {}) The Redis https://github.com/mranney/node_redis#rediscreateclientport-host-options options object.
  • client (RedisClient): optional A existing redis client instance. host and server will be ignored.
  • ns (String): optional (Default: "rsmq") The namespace prefix used for all keys created by rsmq

Please look at the Methods section for optional parameters when creating a queue.

rsmq.createQueue({qname:"myqueue"}, function (errresp) {
        if (resp===1) {
            console.log("queue created")
        }
});
 
rsmq.sendMessage({qname:"myqueue", message:"Hello World"}, function (errresp) {
    if (resp) {
        console.log("Message sent. ID:", resp);
    }
});
rsmq.receiveMessage({qname:"myqueue"}, function (errresp) {
    if (resp.id) {
        console.log("Message received.", resp)  
    }
    else {
        console.log("No messages for me...")
    }
});
rsmq.deleteMessage({qname:"myqueue", id:"dhoiwpiirm15ce77305a5c3a3b0f230c6e20f09b55"}, function (errresp) {
    if (resp===1) {
        console.log("Message deleted.") 
    }
    else {
        console.log("Message not found.")
    }
});

Change the visibility timer of a single message. The time when the message will be visible again is calculated from the current time (now) + vt.

Parameters:

  • qname (String): The Queue name.
  • id (String): The message id.
  • vt (Number): The length of time, in seconds, that this message will not be visible. Allowed values: 0-9999999 (around 115 days)

Returns:

  • 1 if successful, 0 if the message was not found.

Create a new queue.

Parameters:

  • qname (String): The Queue name. Maximum 80 characters; alphanumeric characters, hyphens (-), and underscores (_) are allowed.
  • vt (Number): optional (Default: 30) The length of time, in seconds, that a message received from a queue will be invisible to other receiving components when they ask to receive messages. Allowed values: 0-9999999 (around 115 days)
  • delay (Number): optional (Default: 0) The time in seconds that the delivery of all new messages in the queue will be delayed. Allowed values: 0-9999999 (around 115 days)
  • maxsize (Number): optional (Default: 65536) The maximum message size in bytes. Allowed values: 1024-65536

Returns:

  • 1

Parameters:

  • qname (String): The Queue name.
  • id (String): message id to delete.

Returns:

  • 1 if successful, 0 if the message was not found.

Deletes a queue and all messages.

Parameters:

  • qname (String): The Queue name.

Returns:

  • 1

Get queue attributes, counter and stats

Parameters:

  • qname (String): The Queue name.

Returns an object:

  • vt: The visibility timeout for the queue in seconds
  • delay: The delay for new messages in seconds
  • maxsize: The maximum size of a message in bytes
  • totalrecv: Total number of messages received from the queue
  • totalsent: Total number of messages sent to the queue
  • created: Timestamp (epoch in seconds) when the queue was created
  • modified: Timestamp (epoch in seconds) when the queue was last modified with setQueueAttributes
  • msgs: Current number of messages in the queue
  • hiddenmsgs: Current number of hidden / not visible messages. A message can be hidden while "in flight" due to a vt parameter or when sent with a delay

List all queues

Returns an array:

  • ["qname1", "qname2"]

Receive the next message from the queue.

Parameters:

  • qname (String): The Queue name.
  • vt (Number): optional (Default: queue settings) The length of time, in seconds, that the received message will be invisible to others. Allowed values: 0-9999999 (around 115 days)

Returns an object:

  • message: The message's contents.
  • id: The internal message id.
  • sent: Timestamp of when this message was sent / created.
  • fr: Timestamp of when this message was first received.
  • rc: Number of times this message was received.

Note: Will return an empty object if no message is there

Sends a new message.

Parameters:

  • qname (String)
  • message (String)
  • delay (Number): optional (Default: queue settings) The time in seconds that the delivery of the message will be delayed. Allowed values: 0-9999999 (around 115 days)

Returns:

  • id: The internal message id.

Sets queue parameters.

Parameters:

  • qname (String): The Queue name.
  • vt (Number): optional * The length of time, in seconds, that a message received from a queue will be invisible to other receiving components when they ask to receive messages. Allowed values: 0-9999999 (around 115 days)
  • delay (Number): optional The time in seconds that the delivery of all new messages in the queue will be delayed. Allowed values: 0-9999999 (around 115 days)
  • maxsize (Number): optional The maximum message size in bytes. Allowed values: 1024-65536

Note: At least one attribute (vt, delay, maxsize) must be supplied. Only attributes that are supplied will be modified.

Returns an object:

  • vt: The visibility timeout for the queue in seconds
  • delay: The delay for new messages in seconds
  • maxsize: The maximum size of a message in bytes
  • totalrecv: Total number of messages received from the queue
  • totalsent: Total number of messages sent to the queue
  • created: Timestamp (epoch in seconds) when the queue was created
  • modified: Timestamp (epoch in seconds) when the queue was last modified with setQueueAttributes
  • msgs: Current number of messages in the queue
  • hiddenmsgs: Current number of hidden / not visible messages. A message can be hidden while "in flight" due to a vt parameter or when sent with a delay

Disconnect the redis client. This is only useful if you are using rsmq within a script and want node to be able to exit.

see the CHANGELOG

NameDescription
node-cacheSimple and fast Node.js internal caching. Node internal in memory cache like memcached.
redis-taggingA Node.js helper library to make tagging of items in any legacy database (SQL or NoSQL) easy and fast.
redis-sessionsAn advanced session store for Node.js and Redis
rsmq-workerHelper to implement a worker based on RSMQ (Redis Simple Message Queue).
redis-notificationsA Redis based notification engine. It implements the rsmq-worker to safely create notifications and recurring reports.
task-queue-workerA powerful tool for background processing of tasks that are run by making standard http requests.
obj-schemaSimple module to validate an object by a predefined schema
connect-redis-sessionsA connect or express middleware to use redis sessions that lets you handle multiple sessions per user_id.
systemhealthNode module to run simple custom checks for your machine or it's connections. It will use redis-heartbeat to send the current state to Redis.

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Copyright © Patrick Liess, http://www.tcs.de

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