New buffering algorithm

[ma-zal]

Hello. I improved the buffering algorithm. Because I believe this is the good way, I'm offering it to original pm2-slack as pull request. You are welcome to discuss about it, of course!

Goals:

• Reduce number of messages, that comes to Slack (= reduce number of iOS push notifications).
• Solve more intelligent notifications when some service started to continuous failing. Example: Services starts to sending new error message each second.
• No time limitations in buffer's configuration parameters.
• See the appropriate overview in mobile push notification.
• Parsing message's timestamps generated by PM2.

Implemented algorithm:

1) When new message comes, it is stored to buffer. Buffer starts to wait for interval buffer_seconds. 2) If any next messages comes in this interval, it will be also stored to buffer. Buffer will reset previous interval and starts to waiting for new buffer_seconds. 3) When no new message comes in interval buffer_seconds, buffer sends the messages to Slack channel. 4) To prevent buffer infinite cycling (when new messages are still received from some application), the buffer will forcibly send the buffered messages after buffer_max_seconds (default 60 seconds) interval.

[mattpker]

@ma-zal Thanks!

I added you as a collaborator to the github and npm repo's. Can you please pull this in and publish the new version?

[ma-zal]

Perfect, thanks! I will start working on it on Monday.

[mattpker]

@ma-zal Thanks for getting that in. Looks great!