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mongo-message-queue
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NOTE: This package is compatible with the MongoDB nodejs driver versions 4 through 6 and supports MongoDB server versions 5 through 7.
npm install mongo-message-queue --save
Example:
const MessageQueue = require('mongo-message-queue');
const mQueue = new MessageQueue();
Set the .databasePromise property to a function that returns a promise that (eventually) returns a database connection.
Example:
const MongoClient = require('mongodb').MongoClient;
const mongoUri = ...;
const mongoOptions = ...;
mQueue.databasePromise = function() {
// Return a promise to return a mongo database connection here...
return MongoClient.connect(mongoUri, mongoOptions);
};
Use the .registerWorker method to provide a processing method for a specific type of message in the queue.
Each registered worker will handle a specific type of item in the queue as specified by the first parameter. Registering an additional worker for the same type will override the processing method that is used for that type.
The second parameter of the .registerWorker method is used to specify the processing method for work of that type. When work shows up in the message queue, the provided processing method will be called and provided the queueItem as the first parameter.
The processing method should return a promise (chain) that (eventually) returns a status of "Completed", "Rejected", or "Retry".
Registering a worker will cause the message queue to immediately start polling for work of the specified type. By default, the message queue looks for new messages at least once every second (configurable by overridding the .pollingInterval property). Polling also occurs immediately following the processing of a previous queue message as long as there is still available work in the queue. Polling will continue to occur until the .stopPolling() method is called.
Example:
mQueue.registerWorker('doSomething', function (queueItem) {
// Return a promise to do something here...
return database.collection('somecollection')
.updateOne({_id: queueItem.message.id}, {status: queueItem.message.status})
.then(function (result) {
return 'Completed';
})
.catch(function (err) {
queueItem.releasedReason = err.message;
if ((queueItem.retryCount || 0) < 5) {
queueItem.nextReceivableTime = new Date(Date.now() + 30 * 1000); // Retry after 30 seconds...
return 'Retry';
} else {
queueItem.rejectionReason = 'Gave up after 5 retries.';
return 'Rejected';
}
});
});
Enqueue a message to eventually be picked up and processed by one of the workers.
Example:
mQueue.enqueue('doSomething', {id: 123, status: 'done'});
You can also enqueue a message to be picked up in the future (instead of being immediately available for pickup) by passing in an optional options object with a future nextReceivableTime as the third parameter.
Example:
mQueue.enqueue('doSomething', {id: 123, status: 'done'}, {nextReceivableTime: new Date(Date.now() + 30 * 1000)});
You can also enqueue a message and try to process it immediately with a locally registered worker. If there is not a worker for the specified type registered locally, it will get picked up and processed later when there is an available worker.
Example:
mQueue.enqueueAndProcess('doSomething', {id: 123, status: 'done'});
(The MIT License)
Copyright (c) 2014-2024 Wonderlic, Inc. SoftwareDevelopment@wonderlic.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
FAQs
A promise based message queue for Node.js using a mongodb backing store.
The npm package mongo-message-queue receives a total of 813 weekly downloads. As such, mongo-message-queue popularity was classified as not popular.
We found that mongo-message-queue demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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