revel/panic.go at master · golib/revel

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package revel

import (

"runtime/debug"

)

// PanicFilter wraps the action invocation in a protective defer blanket that

// converts panics into 500 error pages.

func PanicFilter(c *Controller, fc []Filter) {

defer func() {

if err := recover(); err != nil {

handleInvocationPanic(c, err)

}

}()

fc[0](c, fc[1:])

}

// This function handles a panic in an action invocation.

// It cleans up the stack trace, logs it, and displays an error page.

func handleInvocationPanic(c *Controller, err interface{}) {

error := NewErrorFromPanic(err)

if error == nil {

ERROR.Print(err, "\n", string(debug.Stack()))

c.Response.Out.WriteHeader(500)

c.Response.Out.Write(debug.Stack())

return

}

ERROR.Print(err, "\n", error.Stack)

c.Result = c.RenderError(error)

}