google.golang.org/appengine/log isn't compatible with GAE/Go 1.11

[apstndb]

I am trying to migrate apps with App Engine API to Go 1.11 runtime for App Engine standard.
google.golang.org/appengine/log seems broken in Go 1.11 runtime because log loss is happen.

Example to reproduce

package main

import (
	"google.golang.org/appengine"
	"google.golang.org/appengine/log"
	"net/http"
)

func main() {
	http.HandleFunc("/write_log_gae", func(w http.ResponseWriter, req *http.Request) {
		ctx := appengine.NewContext(req)
		log.Infof(ctx, "test")
		w.WriteHeader(http.StatusOK)
	})
	appengine.Main()
}

Single call of /write_log_gae emits three top level logs.

• request log in request
• log level prefixed line in stderr
• internal.flushLog RPC log in stderr

Frequently, RPC log says Call error 3: invalid security ticket and request log doesn't have apps log.

This screenshot is result of calling twice. The bottom half doesn't have app log(Severity is not set from child.)

[sbuss]

Can you confirm that you're using the latest version of this package: https://github.com/golang/appengine/releases/tag/v1.2.0?

[apstndb]

Yes, I am using v1.2.0 of the package specified by go.mod.

module go111

require google.golang.org/appengine v1.2.0

[sbuss]

Thanks for the bug report. I tracked down the issue and have a potential fix in #164. @apstndb, can you try deploying with that fix and verify it works for you?

[apstndb]

I have picked the log-security-ticket-fix branch by go module then deployed it!

$ go get google.golang.org/appengine@log-security-ticket-fix

It seems to be work correctly.
There are no internal.flushLog RPC log and log loss is not happened.

[hazcod]

I have this issue once I deploy to AppEngine (go111) with package v.1.4.0. Any news on this?

[sbuss]

@hazcod This should be included in 1.4.0. You're seeing the exact same behavior? Can you provide some more details, please?

[hazcod]

What details should you need? I see the “invalid security ticket”.

[jbszczepaniak]

Still happening on go 1.12 and google.golang.org/appengine v1.6.1