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