logging.PanicHandler can now be for internal use
Repurpose logging.PanicHandler to recover internal panics and print a message to users similar to panicwrap.
This commit is contained in:
James Bardin
parent
42742c173d
commit
3f31533f86
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@ -2,14 +2,12 @@ package logging
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import (
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"runtime/debug"
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"strings"
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"sync"
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"github.com/hashicorp/go-hclog"
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"github.com/mitchellh/panicwrap"
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)
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// This output is shown if a panic happens.
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@ -18,59 +16,33 @@ const panicOutput = `
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!!!!!!!!!!!!!!!!!!!!!!!!!!! TERRAFORM CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Terraform crashed! This is always indicative of a bug within Terraform.
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A crash log has been placed at %[1]q relative to your current
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working directory. It would be immensely helpful if you could please
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report the crash with Terraform[1] so that we can fix this.
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Please report the crash with Terraform[1] so that we can fix this.
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When reporting bugs, please include your terraform version. That
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information is available on the first line of crash.log. You can also
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get it by running 'terraform --version' on the command line.
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SECURITY WARNING: the %[1]q file that was created may contain
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sensitive information that must be redacted before it is safe to share
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on the issue tracker.
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When reporting bugs, please include your terraform version, the stack trace
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shown below, and any additional information which may help replicate the issue.
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[1]: https://github.com/hashicorp/terraform/issues
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!!!!!!!!!!!!!!!!!!!!!!!!!!! TERRAFORM CRASH !!!!!!!!!!!!!!!!!!!!!!!!!!!!
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`
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// panicHandler is what is called by panicwrap when a panic is encountered
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// within Terraform. It is guaranteed to run after the resulting process has
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// exited so we can take the log file, add in the panic, and store it
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// somewhere locally.
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func PanicHandler(tmpLogPath string) panicwrap.HandlerFunc {
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return func(m string) {
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// Create the crash log file where we'll write the logs
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f, err := ioutil.TempFile(".", "crash.*.log")
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to create crash log file: %s", err)
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return
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}
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defer f.Close()
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tmpLog, err := os.Open(tmpLogPath)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to open log file %q: %v\n", tmpLogPath, err)
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return
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}
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defer tmpLog.Close()
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// Copy the contents to the crash file. This will include
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// the panic that just happened.
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if _, err = io.Copy(f, tmpLog); err != nil {
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fmt.Fprintf(os.Stderr, "Failed to write crash log: %s", err)
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return
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}
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// add the trace back to the log
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f.WriteString("\n" + m)
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// Tell the user a crash occurred in some helpful way that
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// they'll hopefully notice.
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fmt.Printf("\n\n")
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fmt.Printf(panicOutput, f.Name())
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// PanicHandler is called to recover from an internal panic in Terraform, and
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// is intended to replace the standard stack trace with a more user friendly
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// error message.
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// PanicHandler must be called as a defered function.
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func PanicHandler() {
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recovered := recover()
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if recovered == nil {
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return
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}
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fmt.Fprint(os.Stderr, panicOutput)
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fmt.Fprint(os.Stderr, recovered)
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// When called from a deferred function, debug.PrintStack will include the
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// full stack from the point of the pending panic.
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debug.PrintStack()
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os.Exit(2)
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}
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const pluginPanicOutput = `
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@ -181,13 +153,5 @@ func (l *logPanicWrapper) Debug(msg string, args ...interface{}) {
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l.panicRecorder(msg)
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}
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// If we have logging turned on, we need to prevent panicwrap from seeing
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// this as a core panic. This can be done by obfuscating the panic error
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// line.
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if panicPrefix {
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colon := strings.Index(msg, ":")
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msg = strings.ToUpper(msg[:colon]) + msg[colon:]
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}
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l.Logger.Debug(msg, args...)
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}
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@ -1,12 +1,9 @@
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package logging
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import (
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"bytes"
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"fmt"
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"strings"
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"testing"
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"github.com/hashicorp/go-hclog"
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)
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func TestPanicRecorder(t *testing.T) {
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@ -52,31 +49,3 @@ func TestPanicLimit(t *testing.T) {
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}
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}
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}
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func TestLogPanicWrapper(t *testing.T) {
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var buf bytes.Buffer
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logger := hclog.NewInterceptLogger(&hclog.LoggerOptions{
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Name: "test",
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Level: hclog.Debug,
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Output: &buf,
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DisableTime: true,
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})
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wrapped := (&logPanicWrapper{
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Logger: logger,
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}).Named("test")
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wrapped.Debug("panic: invalid foo of bar")
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wrapped.Debug("\tstack trace")
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expected := `[DEBUG] test.test: PANIC: invalid foo of bar
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[DEBUG] test.test: stack trace
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`
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got := buf.String()
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if expected != got {
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t.Fatalf("Expected:\n%q\nGot:\n%q", expected, got)
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}
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}
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