How Can I Recover from Panics in Go Goroutines and Report Errors to Services Like Sentry?

Generic Panic Recovery in Go Programs

Goroutines, lightweight threads in Go, enhance concurrency and asynchrony. However, a routine's panic can disrupt the program's stability. This article explores recovering from panics in goroutines to send error reports to crash-reporting services like Sentry or Raygun.

Problem:

How can panics from child goroutines be captured in the main routine to facilitate error reporting?

Answer:

Goroutines cannot recover from panics in other goroutines. The idiomatic solution is to inject recover() calls into child goroutines using deferred functions.

Idiomatic Ways to Recover Panics:

• Explicit Recovery: Adding a defer func() { recover() } call to the child goroutine allows it to capture its own panics.
• Centralized Logger: Creating a named function to handle panic recovery and calling it as a deferred function in each goroutine streamlines the logging process.
• Wrapper Function: Wrapping child goroutines in a utility function provides a more compact and convenient way to ensure panic recovery.

Example Using the Wrapper Function:

func wrap(f func()) {
 defer func() {
  if r := recover(); r != nil {
   fmt.Println("Caught:", r)
  }
 }()

 f()
}

Usage:

go wrap(func() { panic("catch me") })

Benefits of the Wrapper Function Approach:

• Allows arbitrary function execution without requiring concurrency.
• Provides flexibility in choosing whether to run functions in new goroutines or not.

Note:

Panics should be handled within the goroutine where they occur. Using a wrapper function allows recovery, but the goroutine is still terminated.

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