Troubleshooting "request not found" error about go-replayers

[jba]

Unfortunately the file format is binary. It uses this protobuf: https://github.com/google/go-replayers/blob/master/grpcreplay/proto/grpcreplay/grpcreplay.proto.

Can you post a reproduction of the problem here? I'll try to debug.

[jba]

To display the contents of the .replay file, use Fprint.

[gmgchow]

I tried debugging using Fprint and found that at this line, both e and err are nil so the function exits. I am not sure why e is nil.

This is a sample of how I am trying to use this tool: https://play.golang.org/p/5nm9S3kjpaV . Basically if no .replay file is found, I want to create one so that the next time the same test is run, it will replay the traffic that was recorded.

[vangent]

I am not sure why e is nil.

It looks to me like this happens when the replay file is empty (

go-replayers/grpcreplay/grpcreplay.go

Line 705 in 2e4dd21

return nil, nil

)

You could try using callbacks to see which RPCs are getting recorded:
https://godoc.org/github.com/google/go-replayers/grpcreplay#hdr-Callbacks

Also, make sure your recorder is getting closed correctly; your code looks like it is calling Close, but silently swallowing errors, so just verify that that is working.

[jba]

@gmgchow, e and error are nil at end of file. If all you see from Fprint is

initial state: ...

then you have no records in your replay file.

Are you checking the error returned from Fprint? Maybe there is some other problem.

Also, as @vangent mentioned, you need to handle the error when you close the file (after line 18 in your playground snippet).

Unrelated, but here is a simpler version of ReplayFileExists:

func FileIsReadable(file string) bool {
	_, err := os.Stat(file)
	return err == nil
}

While Stat may return other errors that don't necessarily mean the file doesn't exist, any error suggests that there will be a problem reading the file.