Question about the usage of "end" function in watch.js

[xiaoxiaodek]

Question about the usage of "end" function in watch.js

[silas]

This first line ends the watch when the library raises a validation error. Basically this happens when one of the internal checks are violated (e.g. you pass an object when the library expects a string).

The second line is when Consul returns a 400 status code, which generally indicates that the request as specified is invalid and should not be attempted again without changes to the request. Since watch will not change the request other than parameters related to the watch, it is assumed the request is invalid and stopped. This will is basically the same as the first check but the violation is determined by the consul server.

The 3rd line is the number of consecutive failures the watch will make before giving up (with an exponential backoff). By default this is set to infinity, so unless you're setting maxAttempts this shouldn't affect you.

You can listen for the end event and restart the watch if you think these checks don't apply to your use case.