micro/logger/default.go

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package logger
import (
"context"
"fmt"
"os"
"runtime"
"sort"
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"strings"
"sync"
"time"
dlog "github.com/micro/go-micro/v3/debug/log"
)
func init() {
lvl, err := GetLevel(os.Getenv("MICRO_LOG_LEVEL"))
if err != nil {
lvl = InfoLevel
}
DefaultLogger = NewHelper(NewLogger(WithLevel(lvl)))
}
type defaultLogger struct {
sync.RWMutex
opts Options
}
// Init(opts...) should only overwrite provided options
func (l *defaultLogger) Init(opts ...Option) error {
for _, o := range opts {
o(&l.opts)
}
return nil
}
func (l *defaultLogger) String() string {
return "default"
}
func (l *defaultLogger) Fields(fields map[string]interface{}) Logger {
l.Lock()
l.opts.Fields = copyFields(fields)
l.Unlock()
return l
}
func copyFields(src map[string]interface{}) map[string]interface{} {
dst := make(map[string]interface{}, len(src))
for k, v := range src {
dst[k] = v
}
return dst
}
// logCallerfilePath returns a package/file:line description of the caller,
// preserving only the leaf directory name and file name.
func logCallerfilePath(loggingFilePath string) string {
// To make sure we trim the path correctly on Windows too, we
// counter-intuitively need to use '/' and *not* os.PathSeparator here,
// because the path given originates from Go stdlib, specifically
// runtime.Caller() which (as of Mar/17) returns forward slashes even on
// Windows.
//
// See https://github.com/golang/go/issues/3335
// and https://github.com/golang/go/issues/18151
//
// for discussion on the issue on Go side.
idx := strings.LastIndexByte(loggingFilePath, '/')
if idx == -1 {
return loggingFilePath
}
idx = strings.LastIndexByte(loggingFilePath[:idx], '/')
if idx == -1 {
return loggingFilePath
}
return loggingFilePath[idx+1:]
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}
func (l *defaultLogger) Log(level Level, v ...interface{}) {
// TODO decide does we need to write message if log level not used?
if !l.opts.Level.Enabled(level) {
return
}
l.RLock()
fields := copyFields(l.opts.Fields)
l.RUnlock()
fields["level"] = level.String()
if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
fields["file"] = fmt.Sprintf("%s:%d", logCallerfilePath(file), line)
}
rec := dlog.Record{
Timestamp: time.Now(),
Message: fmt.Sprint(v...),
Metadata: make(map[string]string, len(fields)),
}
keys := make([]string, 0, len(fields))
for k, v := range fields {
keys = append(keys, k)
rec.Metadata[k] = fmt.Sprintf("%v", v)
}
sort.Strings(keys)
metadata := ""
for _, k := range keys {
metadata += fmt.Sprintf(" %s=%v", k, fields[k])
}
t := rec.Timestamp.Format("2006-01-02 15:04:05")
fmt.Printf("%s %s %v\n", t, metadata, rec.Message)
}
func (l *defaultLogger) Logf(level Level, format string, v ...interface{}) {
// TODO decide does we need to write message if log level not used?
if level < l.opts.Level {
return
}
l.RLock()
fields := copyFields(l.opts.Fields)
l.RUnlock()
fields["level"] = level.String()
if _, file, line, ok := runtime.Caller(l.opts.CallerSkipCount); ok {
fields["file"] = fmt.Sprintf("%s:%d", logCallerfilePath(file), line)
}
rec := dlog.Record{
Timestamp: time.Now(),
Message: fmt.Sprintf(format, v...),
Metadata: make(map[string]string, len(fields)),
}
keys := make([]string, 0, len(fields))
for k, v := range fields {
keys = append(keys, k)
rec.Metadata[k] = fmt.Sprintf("%v", v)
}
sort.Strings(keys)
metadata := ""
for _, k := range keys {
metadata += fmt.Sprintf(" %s=%v", k, fields[k])
}
t := rec.Timestamp.Format("2006-01-02 15:04:05")
fmt.Printf("%s %s %v\n", t, metadata, rec.Message)
}
func (l *defaultLogger) Options() Options {
// not guard against options Context values
l.RLock()
opts := l.opts
opts.Fields = copyFields(l.opts.Fields)
l.RUnlock()
return opts
}
// NewLogger builds a new logger based on options
func NewLogger(opts ...Option) Logger {
// Default options
options := Options{
Level: InfoLevel,
Fields: make(map[string]interface{}),
Out: os.Stderr,
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CallerSkipCount: 2,
Context: context.Background(),
}
l := &defaultLogger{opts: options}
if err := l.Init(opts...); err != nil {
l.Log(FatalLevel, err)
}
return l
}