micro/debug/log/log.go
Milos Gajdos 4613a820ca
Small refactoring og logs
* log.Write now accepts log.Record
* we stream last 10 records first
* regenerate proto because of the above
2019-12-01 13:16:44 +00:00

180 lines
3.4 KiB
Go

// Package log provides debug logging
package log
import (
"fmt"
"os"
"time"
)
var (
// DefaultLog logger
DefaultLog = NewLog()
// DefaultLevel is default log level
DefaultLevel = LevelInfo
// prefix for all messages
prefix string
)
// Log is event log
type Log interface {
// Read reads log entries from the logger
Read(...ReadOption) []Record
// Write writes records to log
Write(Record)
// Stream log records
Stream(chan bool) <-chan Record
}
// Record is log record entry
type Record struct {
// Timestamp of logged event
Timestamp time.Time
// Value contains log entry
Value interface{}
// Metadata to enrich log record
Metadata map[string]string
}
// level is a log level
type Level int
const (
LevelFatal Level = iota
LevelError
LevelInfo
LevelWarn
LevelDebug
LevelTrace
)
func init() {
switch os.Getenv("MICRO_LOG_LEVEL") {
case "trace":
DefaultLevel = LevelTrace
case "debug":
DefaultLevel = LevelDebug
case "warn":
DefaultLevel = LevelWarn
case "info":
DefaultLevel = LevelInfo
case "error":
DefaultLevel = LevelError
case "fatal":
DefaultLevel = LevelFatal
}
}
func log(v ...interface{}) {
if len(prefix) > 0 {
DefaultLog.Write(Record{Value: fmt.Sprint(append([]interface{}{prefix, " "}, v...)...)})
return
}
DefaultLog.Write(Record{Value: fmt.Sprint(v...)})
}
func logf(format string, v ...interface{}) {
if len(prefix) > 0 {
format = prefix + " " + format
}
DefaultLog.Write(Record{Value: fmt.Sprintf(format, v...)})
}
// WithLevel logs with the level specified
func WithLevel(l Level, v ...interface{}) {
if l > DefaultLevel {
return
}
log(v...)
}
// WithLevel logs with the level specified
func WithLevelf(l Level, format string, v ...interface{}) {
if l > DefaultLevel {
return
}
logf(format, v...)
}
// Trace provides trace level logging
func Trace(v ...interface{}) {
WithLevel(LevelTrace, v...)
}
// Tracef provides trace level logging
func Tracef(format string, v ...interface{}) {
WithLevelf(LevelTrace, format, v...)
}
// Debug provides debug level logging
func Debug(v ...interface{}) {
WithLevel(LevelDebug, v...)
}
// Debugf provides debug level logging
func Debugf(format string, v ...interface{}) {
WithLevelf(LevelDebug, format, v...)
}
// Warn provides warn level logging
func Warn(v ...interface{}) {
WithLevel(LevelWarn, v...)
}
// Warnf provides warn level logging
func Warnf(format string, v ...interface{}) {
WithLevelf(LevelWarn, format, v...)
}
// Info provides info level logging
func Info(v ...interface{}) {
WithLevel(LevelInfo, v...)
}
// Infof provides info level logging
func Infof(format string, v ...interface{}) {
WithLevelf(LevelInfo, format, v...)
}
// Error provides warn level logging
func Error(v ...interface{}) {
WithLevel(LevelError, v...)
}
// Errorf provides warn level logging
func Errorf(format string, v ...interface{}) {
WithLevelf(LevelError, format, v...)
}
// Fatal logs with Log and then exits with os.Exit(1)
func Fatal(v ...interface{}) {
WithLevel(LevelFatal, v...)
os.Exit(1)
}
// Fatalf logs with Logf and then exits with os.Exit(1)
func Fatalf(format string, v ...interface{}) {
WithLevelf(LevelFatal, format, v...)
os.Exit(1)
}
// SetLevel sets the log level
func SetLevel(l Level) {
DefaultLevel = l
}
// GetLevel returns the current level
func GetLevel() Level {
return DefaultLevel
}
// Set a prefix for the logger
func SetPrefix(p string) {
prefix = p
}
// Set service name
func Name(name string) {
prefix = fmt.Sprintf("[%s]", name)
}