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Will node-gcm fail if I send it more than 1000 Registrations ID's in a single message as that is all Google support? Do I have to split it up myself before hand?
If anyone else needs to support more than 1,000 devices, you can easily split the tokens up into batches like this:
// Max devices per request
var batchLimit = 1000;
// Batches will be added to this array
var tokenBatches = [];
// Traverse tokens and split them up into batches of 1,000 devices each
for (var start = 0; start < tokens.length; start += batchLimit) {
// Get next 1,000 tokens
var slicedTokens = tokens.slice(start, start + batchLimit);
// Add to batches array
tokenBatches.push(slicedTokens);
}
// You can now send a push to each batch of devices, in parallel, using the caolan/async library
async.each(batches, function (batch, callback) {
// Assuming you already set up the sender and message
sender.send(message, { registrationIds: batch }, function (err, result) {
// Push failed?
if (err) {
// Stop executing other batches
return callback(err);
}
// Done with batch
callback();
});
},
function (err) {
// Log the error to console
if (err) {
console.log(err);
}
});
Reacted by Stathis Ntonas, Rayyan Tahir and GustavoFazani
I agree, that was the original intention with parallel-batch. As it turns out, though, it's easier said than done.
Specifically we want to return errors correctly (as if no batching happened; so if only some of the batches fail, some of the messages will still (possibly) be sent); and we want to handle retries the way the user expects (which is also hard).
I think it's doable -- in case one of the batches failed, we'll retry it until we run out of tries. We just have to make sure that GCM doesn't deliver the push notification to some devices in the batch while erroring out -- that would cause some serious spamming. But in any case, it could be happening today with < 1,000 devices in sender.send.
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ToothlessGear commentedon Jan 30, 2014
You'll have to split your ID's beforehand, as node-gcm doesn't do that for you automatically yet.
leearmstrong commentedon Jan 30, 2014
Perfect. Thanks!
eladnava commentedon Oct 4, 2015
If anyone else needs to support more than 1,000 devices, you can easily split the tokens up into batches like this:
hypesystem commentedon Oct 4, 2015
I wrote parallel-batch which does pretty much that: https://www.npmjs.com/package/parallel-batch
eladnava commentedon Oct 4, 2015
Nice package! Would greatly simplify the code I wrote.
eladnava commentedon Oct 4, 2015
@hypesystem maybe it would be a good idea to integrate your parallel-batch library into node-gcm, so that batching will be performed automagically?
hypesystem commentedon Oct 4, 2015
I agree, that was the original intention with parallel-batch. As it turns out, though, it's easier said than done.
Specifically we want to return errors correctly (as if no batching happened; so if only some of the batches fail, some of the messages will still (possibly) be sent); and we want to handle retries the way the user expects (which is also hard).
eladnava commentedon Oct 4, 2015
I think it's doable -- in case one of the batches failed, we'll retry it until we run out of
tries. We just have to make sure that GCM doesn't deliver the push notification to some devices in the batch while erroring out -- that would cause some serious spamming. But in any case, it could be happening today with < 1,000 devices insender.send.hypesystem commentedon Oct 5, 2015
I would love to see you give it a try. First of all, though, I think we need a new issue to discuss this -- feel free to create it.
I will try to gather my thoughts on what behaviour I think we would want, and why, exactly, it is tricky :-)