From 2da06254638cfbb6bce0c5dc1be1ea8877309794 Mon Sep 17 00:00:00 2001 From: Tim Neumann Date: Mon, 3 Oct 2022 19:02:56 +0200 Subject: [PATCH] Initial implementation --- README.md | 33 ++++++++++++ go.mod | 10 ++++ go.sum | 146 +++++++++++++++++++++++++++++++++++++++++++++++++ logtrace.go | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++++ shell.nix | 9 ++++ 5 files changed, 350 insertions(+) create mode 100644 go.mod create mode 100644 go.sum create mode 100644 logtrace.go create mode 100644 shell.nix diff --git a/README.md b/README.md index aab11f0..ac3d81b 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,35 @@ # logtrace + Logrus hook for attaching an error traceback to a log entry + +This project is a hook for the golang logging libary [logrus](https://github.com/sirupsen/logrus). +It attaches a stacktrace field to log entries with an error. +It is primarily developed to work with the error libary [merry/v2](https://github.com/ansel1/merry/tree/main/v2). +However, it also works with all errors implementing a `Callers()` function like for example the errors from [go-errors](https://github.com/go-errors/errors). + +## Usage + +To use the hook, just register it with logrus: + +```go +import "github.com/neumantm/logtrace" + +func setupLogging() { + // ... + logrus.AddHook(logtrace.DefaultLogtraceHook()) + // Alternatively with custom parameters: + //logrus.AddHook(logtrace.LogtraceHook{ + // Key: "SomeKey", + // LogLevels: logrus.AllLevels, + // CaptureStackIfMissing: false, + //}) + // ... +} +``` + +The default hook runs on all levels uses the key `stacktrace` and captures the stack if the error does not have a compatible stack. + +## Stacktrace accuracy + +Sometimes the entries on the stacktrace may not be what you expect because of compiler optimizations. +To avoid this problem (during development or debugging) disable compiler optimizations and inlining by passing `-gcflags '-N -l'` to `go build` or `go run`. diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..827dd73 --- /dev/null +++ b/go.mod @@ -0,0 +1,10 @@ +module github.com/neumantm/logtrace + +go 1.18 + +require ( + github.com/ansel1/merry/v2 v2.0.1 + github.com/sirupsen/logrus v1.9.0 +) + +require golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..44daa04 --- /dev/null +++ b/go.sum @@ -0,0 +1,146 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/ansel1/merry v1.5.0/go.mod h1:wUy/yW0JX0ix9GYvUbciq+bi3jW/vlKPlbpI7qdZpOw= +github.com/ansel1/merry v1.5.1/go.mod h1:wUy/yW0JX0ix9GYvUbciq+bi3jW/vlKPlbpI7qdZpOw= +github.com/ansel1/merry/v2 v2.0.1 h1:WeiKZdslHPAPFYxTtgX7clC2Vh75NCoWs5OjCZbIA0A= +github.com/ansel1/merry/v2 v2.0.1/go.mod 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h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo= +gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/logtrace.go b/logtrace.go new file mode 100644 index 0000000..d43e8af --- /dev/null +++ b/logtrace.go @@ -0,0 +1,152 @@ +package logtrace + +import ( + "errors" + "runtime" + "strings" + + "github.com/ansel1/merry/v2" + "github.com/sirupsen/logrus" +) + +// LogtraceHook is a logrus hook that attaches a stacktrace to log entries with errors +type LogtraceHook struct { + // The key (for the field in the logrus entry) to use for the stacktrace + Key string + // The log levels this hook should be fired for + LogLevels []logrus.Level + // Whether to capture a new stacktrace for errors without a stacktrace + // + // The captures tacktrace corresponds to the call of the log function, not the actual origin of the error + // However, this may still help in identifying the path + CaptureStackIfMissing bool +} + +// DefaultLogtraceHook returns the default LogtraceHook +// +// It has the following properties +// - The key is "stacktrace" +// - The hook runs on all log levels +// - For errors without a stacktrace a new stacktrace is captured corresponding to the call of the log function +func DefaultLogtraceHook() LogtraceHook { + return LogtraceHook{ + Key: "stacktrace", + LogLevels: logrus.AllLevels, + CaptureStackIfMissing: true, + } +} + +func (hook LogtraceHook) Levels() []logrus.Level { + return hook.LogLevels +} + +// A StackFrame represents one frame in a stacktrace +type StackFrame struct { + // File is the path to the file containing the instruction of the StackFrame + File string + // The Line of the instruction of the StackFrame + Line int + // The Function of the instruction of the StackFrame + Function string + // The Package that contains the Function + Package string +} + +// newStackFrame returns the StackFrame for the given programCounter +// +// Returns empty StackFrame if no function can be associated with the programCounter +// +// Based on and partially copied from github.com/go-errors/errors +// Copyright (c) 2015 Conrad Irwin +// Licensed under MIT license +func newStackFrame(programCounter uintptr) StackFrame { + f := runtime.FuncForPC(programCounter) + if f == nil { + return StackFrame{} + } + + // pc -1 because the program counters we use are usually return addresses, + // and we want to show the line that corresponds to the function call + file, line := f.FileLine(programCounter - 1) + + name := f.Name() + pkg := "" + + // The name includes the path name to the package, which is unnecessary + // since the file name is already included. Plus, it has center dots. + // That is, we see + // runtime/debug.*T·ptrmethod + // and want + // *T.ptrmethod + // Since the package path might contains dots (e.g. code.google.com/...), + // we first remove the path prefix if there is one. + if lastslash := strings.LastIndex(name, "/"); lastslash >= 0 { + pkg += name[:lastslash] + "/" + name = name[lastslash+1:] + } + if period := strings.Index(name, "."); period >= 0 { + pkg += name[:period] + name = name[period+1:] + } + + name = strings.Replace(name, "·", ".", -1) + + return StackFrame{ + File: file, + Line: line, + Function: name, + Package: pkg, + } +} + +func (hook LogtraceHook) retrieveProgramCounters(err error) []uintptr { + var errorWithCallers interface { + Callers() []uintptr + } + stack := merry.Stack(err) + if stack != nil { + // merry error + return stack + } else if errors.As(err, &errorWithCallers) { + // go-errors style error + return errorWithCallers.Callers() + } else if hook.CaptureStackIfMissing { + // incompatible error, capture stack now + return merry.Stack(merry.WrapSkipping(err, 6)) + } else { + // incompatible error, no stack + return nil + } +} + +func (hook LogtraceHook) retrieveStackFrames(err error) []StackFrame { + pcs := hook.retrieveProgramCounters(err) + + if pcs == nil || len(pcs) == 0 { + return []StackFrame{} + } + + result := make([]StackFrame, len(pcs)) + for idx, pc := range pcs { + result[idx] = newStackFrame(pc) + } + return result +} + +// Fire is called by logrus when to hook is supposed to run +func (hook LogtraceHook) Fire(entry *logrus.Entry) error { + if hook.Key == "" { + return merry.Errorf("The key of the hook must be set to a non empty string.") + } + if err_raw, hasError := entry.Data[logrus.ErrorKey]; hasError { + err, ok := err_raw.(error) + if !ok { + return merry.Errorf("The value in the error field of the given logrus entry is not an error!") + } + stack := hook.retrieveStackFrames(err) + if len(stack) > 0 { + entry.Data = entry.WithField(hook.Key, stack).Data + } + } + return nil +} diff --git a/shell.nix b/shell.nix new file mode 100644 index 0000000..4cb2b2e --- /dev/null +++ b/shell.nix @@ -0,0 +1,9 @@ +{ pkgs ? import {} }: + +pkgs.mkShell { + + buildInputs = with pkgs; [ + go_1_18 + gotools + ]; +}