Panic recovery pattern

As explained in Go in Practice, Second Edition

A panic recovery pattern is a control-flow pattern that catches a panic, preserves or reports its information, and allows surrounding application execution to continue.

A panic recovery pattern places deferred recovery around goroutine or request-handler work, records the panic, and lets the surrounding application continue running. section 4.3.5

Implement the pattern by:

• Starting the goroutine or handler inside a protected function. section 4.3.5
• Deferring an anonymous function that calls recover. section 4.3.5
• Logging or displaying the recovered panic information. section 4.3.5
• Deferring required cleanup, such as closing a network connection. section 4.3.5

Protecting a goroutine

A helper accepts a no-argument function, launches it in a goroutine, and recovers panics inside that goroutine. Calling it with a function that panics logs the error while the main program continues. section 4.3.5

Figure 4.2 A simple server

Use the server and goroutine listings to compare an unprotected panic with deferred recovery and logged continuation. section 4.3.5

How Go in Practice, Second Edition covers it

How deep it goes

Shows deferred recover, panic logging, connection cleanup, helper encapsulation, and closure cautions without developing broader concurrency safeguards.

Examples

Uses an echo server, a panicking HTTP handler, a protected socket handler, and a safely.Go helper.

What it assumes

Assumes familiarity with Go functions and goroutines while demonstrating defer, recover, handlers, and closures in context.

What you can do after

Apply it via deferred recover to log goroutine or handler panics and keep surrounding execution running.

How it connects

Connects panic handling with goroutines, recover, closures, HTTP servers, connection cleanup, and race conditions.

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