CODEWITHSUNDEEP
logginggopanic
harryz
harryz

Reputation: 5260

Golang: How to capture panic and log this error to original log file?

I tried to capture panic and log the error:

func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
    defer func() {
        if err := recover(); err != nil {
            glog.Errorf("Recovered from err: %v", err)
        }
    }()
    panic("TISH IS A PANIC")
    return &pb.HelloReply{Message: "Hello " + in.Name}, nil
}

But to my surprise, the "Recovered from err: " never occurs in my log file, instead, it occurs in /var/log/messages.

How can I log that error in my original log file?

[Updated]

If there is no panic, glog.Errorf will log correctly to its log dir; when there is panic, it just can't:

// this glog will log correctly, unless uncomment the panic below
glog.Errorf("This is a normal log: %v", err)  
// panic("TISH IS A PANIC")

Maybe this is impossible, since that's what crash means?

Upvotes: 0

Views: 3227

Answers (1)

Rob Bradford
Rob Bradford

Reputation: 1460

You need to call glog.Flush() in your deferred function. From the documentation of glog:

Log output is buffered and written periodically using Flush. Programs should call Flush before exiting to guarantee all log output is written.

https://godoc.org/github.com/golang/glog

Upvotes: 1

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