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// Copyright (c) 2012-2016 The Revel Framework Authors, All rights reserved.
// Revel Framework source code and usage is governed by a MIT style
// license that can be found in the LICENSE file.
package revel
import (
"fmt"
"net/http"
"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 {
utilLog.Error("PanicFilter: Caught panic", "error", err, "stack", error.Stack)
if DevMode {
fmt.Println(err)
fmt.Println(error.Stack)
}
} else {
utilLog.Error("PanicFilter: Caught panic, unable to determine stack location", "error", err, "stack", string(debug.Stack()))
if DevMode {
fmt.Println(err)
fmt.Println("stack", string(debug.Stack()))
}
}
if error == nil && DevMode {
// Only show the sensitive information in the debug stack trace in development mode, not production
c.Response.SetStatus(http.StatusInternalServerError)
_, _ = c.Response.GetWriter().Write(debug.Stack())
return
}
c.Result = c.RenderError(error)
}