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go-micro/debug/log/log.go

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// Package log provides debug logging
package log
import (
"fmt"
"os"
"time"
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)
var (
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// DefaultLog logger
DefaultLog = NewLog()
// DefaultLevel is default log level
DefaultLevel = LevelInfo
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// prefix for all messages
prefix string
)
// Log is event log
type Log interface {
// Read reads log entries from the logger
Read(...ReadOption) []Record
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// Write writes logs to logger
Write(...interface{})
}
// 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
}
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// 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":
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DefaultLevel = LevelTrace
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case "debug":
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DefaultLevel = LevelDebug
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case "warn":
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DefaultLevel = LevelWarn
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case "info":
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DefaultLevel = LevelInfo
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case "error":
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DefaultLevel = LevelError
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case "fatal":
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DefaultLevel = LevelFatal
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}
}
func log(v ...interface{}) {
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if len(prefix) > 0 {
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DefaultLog.Write(fmt.Sprint(append([]interface{}{prefix, " "}, v...)...))
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return
}
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DefaultLog.Write(fmt.Sprint(v...))
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}
func logf(format string, v ...interface{}) {
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if len(prefix) > 0 {
format = prefix + " " + format
}
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DefaultLog.Write(fmt.Sprintf(format, v...))
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}
// WithLevel logs with the level specified
func WithLevel(l Level, v ...interface{}) {
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if l > DefaultLevel {
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return
}
log(v...)
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}
// WithLevel logs with the level specified
func WithLevelf(l Level, format string, v ...interface{}) {
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if l > DefaultLevel {
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return
}
logf(format, v...)
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}
// 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) {
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DefaultLevel = l
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}
// GetLevel returns the current level
func GetLevel() Level {
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return DefaultLevel
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}
// Set a prefix for the logger
func SetPrefix(p string) {
prefix = p
}
// Set service name
func Name(name string) {
prefix = fmt.Sprintf("[%s]", name)
}