Initial commit

This commit is contained in:
Simon Eskildsen 2014-02-23 09:57:04 -05:00
parent bc7134c305
commit 84ff01f444
1 changed files with 353 additions and 0 deletions

353
logrus.go Normal file
View File

@ -0,0 +1,353 @@
package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"os"
"strings"
"sync"
"time"
"github.com/tobi/airbrake-go"
)
// TODO: Type naming here feels awkward, but the exposed variable should be
// Level. That's more important than the type name, and libraries should be
// reaching for logrus.Level{Debug,Info,Warning,Fatal}, not defining the type
// themselves as an int.
type LevelType uint8
type Fields map[string]interface{}
const (
LevelPanic LevelType = iota
LevelFatal
LevelWarning
LevelInfo
LevelDebug
)
var Level LevelType = LevelInfo
var Environment string = "development"
// StandardLogger is what your logrus-enabled library should take, that way
// it'll accept a stdlib logger and a logrus logger. There's no standard
// interface, this is the closest we get, unfortunately.
type StandardLogger interface {
Print(...interface{})
Printf(string, ...interface{})
Printfln(...interface{})
Fatal(...interface{})
Fatalf(string, ...interface{})
Fatalln(...interface{})
Panic(...interface{})
Panicf(string, ...interface{})
Panicln(...interface{})
}
type Logger struct {
Out io.Writer
mu sync.Mutex
}
type Entry struct {
logger *Logger
Data Fields
}
// TODO: Other formats?
func (entry *Entry) Reader() (read *bytes.Buffer, err error) {
var serialized []byte
if Environment == "production" {
serialized, err = json.Marshal(entry.Data)
} else {
// TODO: Pretty-print more by coloring when stdout is a tty
serialized, err = json.MarshalIndent(entry.Data, "", " ")
}
if err != nil {
return nil, err
}
serialized = append(serialized, '\n')
return bytes.NewBuffer(serialized), nil
}
func New() *Logger {
environment := strings.ToLower(os.Getenv("ENV"))
if environment == "" {
environment = "development"
}
if airbrake.Environment == "" {
airbrake.Environment = environment
}
return &Logger{
Out: os.Stdout, // Default to stdout, change it if you want.
}
}
func NewEntry(logger *Logger) *Entry {
return &Entry{
logger: logger,
// Default is three fields, give a little extra room. Shouldn't hurt the
// scale.
Data: make(Fields, 5),
}
}
func (logger *Logger) WithField(key string, value interface{}) *Entry {
entry := NewEntry(logger)
entry.WithField(key, value)
return entry
}
func (logger *Logger) WithFields(fields Fields) *Entry {
entry := NewEntry(logger)
entry.WithFields(fields)
return entry
}
func (entry *Entry) WithField(key string, value interface{}) *Entry {
entry.Data[key] = value
return entry
}
func (entry *Entry) WithFields(fields Fields) *Entry {
for key, value := range fields {
entry.WithField(key, value)
}
return entry
}
func (entry *Entry) log(level string, msg string) {
// TODO: Is the default format output from String() the one we want?
entry.Data["timestamp"] = time.Now().String()
entry.Data["level"] = level
// TODO: Is this the best name?
entry.Data["msg"] = msg
reader, err := entry.Reader()
if err != nil {
entry.logger.Panicln("Failed to marshal JSON ", err.Error())
}
// Send HTTP request in a goroutine in warning environment to not halt the
// main thread. It's sent before logging due to panic.
if level == "warning" {
// TODO: new() should spawn an airbrake goroutine and this should send to
// that channel. This prevent us from spawning hundreds of goroutines in a
// hot code path generating a warning.
go entry.airbrake(reader.String())
} else if level == "fatal" || level == "panic" {
entry.airbrake(reader.String())
}
if level == "panic" {
panic(reader.String())
} else {
entry.logger.mu.Lock()
io.Copy(entry.logger.Out, reader)
entry.logger.mu.Unlock()
}
}
func (entry *Entry) airbrake(exception string) {
err := airbrake.Notify(errors.New(exception))
if err != nil {
entry.logger.WithFields(Fields{
"source": "airbrake",
"endpoint": airbrake.Endpoint,
}).Infof("Failed to send exception to Airbrake")
}
}
// Entry Print family functions
func (entry *Entry) Debug(args ...interface{}) {
if Level >= LevelDebug {
entry.log("debug", fmt.Sprint(args...))
}
}
func (entry *Entry) Info(args ...interface{}) {
if Level >= LevelInfo {
entry.log("info", fmt.Sprint(args...))
}
}
func (entry *Entry) Print(args ...interface{}) {
if Level >= LevelInfo {
entry.log("info", fmt.Sprint(args...))
}
}
func (entry *Entry) Warning(args ...interface{}) {
if Level >= LevelWarning {
entry.log("warning", fmt.Sprint(args...))
}
}
func (entry *Entry) Fatal(args ...interface{}) {
if Level >= LevelFatal {
entry.log("fatal", fmt.Sprint(args...))
}
os.Exit(1)
}
func (entry *Entry) Panic(args ...interface{}) {
if Level >= LevelPanic {
entry.log("panic", fmt.Sprint(args...))
}
}
// Entry Printf family functions
func (entry *Entry) Debugf(format string, args ...interface{}) {
entry.Debug(fmt.Sprintf(format, args...))
}
func (entry *Entry) Infof(format string, args ...interface{}) {
entry.Info(fmt.Sprintf(format, args...))
}
func (entry *Entry) Printf(format string, args ...interface{}) {
entry.Print(fmt.Sprintf(format, args...))
}
func (entry *Entry) Warningf(format string, args ...interface{}) {
entry.Warning(fmt.Sprintf(format, args...))
}
func (entry *Entry) Fatalf(format string, args ...interface{}) {
entry.Fatal(fmt.Sprintf(format, args...))
}
func (entry *Entry) Panicf(format string, args ...interface{}) {
entry.Panic(fmt.Sprintf(format, args...))
}
// Entry Println family functions
func (entry *Entry) Debugln(args ...interface{}) {
entry.Debug(fmt.Sprintln(args...))
}
func (entry *Entry) Infoln(args ...interface{}) {
entry.Info(fmt.Sprintln(args...))
}
func (entry *Entry) Println(args ...interface{}) {
entry.Print(fmt.Sprintln(args...))
}
func (entry *Entry) Warningln(args ...interface{}) {
entry.Warning(fmt.Sprintln(args...))
}
func (entry *Entry) Fatalln(args ...interface{}) {
entry.Fatal(fmt.Sprintln(args...))
}
func (entry *Entry) Panicln(args ...interface{}) {
entry.Panic(fmt.Sprintln(args...))
}
// Logger Printf family functions
func (logger *Logger) Debugf(format string, args ...interface{}) {
NewEntry(logger).Debugf(format, args...)
}
func (logger *Logger) Infof(format string, args ...interface{}) {
NewEntry(logger).Infof(format, args...)
}
func (logger *Logger) Printf(format string, args ...interface{}) {
NewEntry(logger).Printf(format, args...)
}
func (logger *Logger) Warningf(format string, args ...interface{}) {
NewEntry(logger).Warningf(format, args...)
}
func (logger *Logger) Fatalf(format string, args ...interface{}) {
NewEntry(logger).Fatalf(format, args...)
}
func (logger *Logger) Panicf(format string, args ...interface{}) {
NewEntry(logger).Panicf(format, args...)
}
// Logger Print family functions
func (logger *Logger) Debug(args ...interface{}) {
NewEntry(logger).Debug(args...)
}
func (logger *Logger) Info(args ...interface{}) {
NewEntry(logger).Info(args...)
}
func (logger *Logger) Print(args ...interface{}) {
NewEntry(logger).Print(args...)
}
func (logger *Logger) Warning(args ...interface{}) {
NewEntry(logger).Warning(args...)
}
func (logger *Logger) Fatal(args ...interface{}) {
NewEntry(logger).Fatal(args...)
}
func (logger *Logger) Panic(args ...interface{}) {
NewEntry(logger).Panic(args...)
}
// Logger Println family functions
func (logger *Logger) Debugln(args ...interface{}) {
NewEntry(logger).Debugln(args...)
}
func (logger *Logger) Infoln(args ...interface{}) {
NewEntry(logger).Infoln(args...)
}
func (logger *Logger) Println(args ...interface{}) {
NewEntry(logger).Println(args...)
}
func (logger *Logger) Warningln(args ...interface{}) {
NewEntry(logger).Warningln(args...)
}
func (logger *Logger) Fatalln(args ...interface{}) {
NewEntry(logger).Fatalln(args...)
}
func (logger *Logger) Panicln(args ...interface{}) {
NewEntry(logger).Panicln(args...)
}
// TODO: Print, Fatal, etc.
func main() {
Environment = "development"
Level = LevelDebug
logger := New()
logger.WithField("animal", "walrus").WithField("value", 10).Infof("OMG HELLO")
logger.Infof("lolsup")
logger.Debugf("why brackets?")
logger.Debug("lolsup")
logger.Fatalf("omg")
}