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logs.go
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logs.go
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package logs
import (
"fmt"
"sync"
"time"
"errors"
"strings"
"runtime"
"reflect"
"encoding/json"
//
"golang.org/x/net/context"
"cloud.google.com/go/logging"
"google.golang.org/appengine/log"
)
func fn() string {
names := []string{}
pc, _, _, ok := runtime.Caller(5)
if ok { names = append(names, runtime.FuncForPC(pc).Name()) }
pc, _, _, ok = runtime.Caller(4)
if ok { names = append(names, runtime.FuncForPC(pc).Name()) }
pc, _, _, ok = runtime.Caller(3)
if ok { names = append(names, runtime.FuncForPC(pc).Name()) }
return strings.Join(names, "/")
}
// creates a new logging client
func NewClient(googleProjectName string, ctx context.Context) *LogClient {
client, err := logging.NewClient(ctx, googleProjectName); if err != nil { panic(err) }
return &LogClient{
ctx,
client,
map[string]*Logger{},
sync.RWMutex{},
}
}
type LogClient struct {
ctx context.Context
client *logging.Client
loggers map[string]*Logger
sync.RWMutex
}
func (lc *LogClient) Close() {
lc.client.Close()
}
// creates a new logger based on the input name
func (lc *LogClient) NewLogger(logFuncNames ...string) *Logger {
var logFuncName string
if len(logFuncNames) == 0 {
pc, _, _, _ := runtime.Caller(1)
logFuncName = runtime.FuncForPC(pc).Name()
// remove illegal chars from log name
logFuncName = strings.Replace(logFuncName, "*", "", -1)
logFuncName = strings.Replace(logFuncName, "(", "", -1)
logFuncName = strings.Replace(logFuncName, ")", "", -1)
} else {
logFuncName = logFuncNames[0]
}
lc.Lock()
defer lc.Unlock()
if lc.loggers[logFuncName] == nil {
lc.loggers[logFuncName] = &Logger{
lc.ctx,
lc.client,
lc.client.Logger(logFuncName),
}
}
return lc.loggers[logFuncName]
}
type Logger struct {
ctx context.Context
client *logging.Client
logger *logging.Logger
}
func (lg *Logger) Flush() {
lg.logger.Flush()
}
// creates and executes a logging entry
func (lg *Logger) Log(msg interface{}, severity logging.Severity) {
fn := fn()
// show only last n chars of fn
n := 64
l := len(fn)
if l > n { fn = fn[l-n:] }
payload := fmt.Sprintf(
"%v:%s: %v",
time.Now().UTC().Unix(),
fn,
msg,
)
switch severity {
case logging.Error:
log.Errorf(lg.ctx, payload)
case logging.Debug:
log.Debugf(lg.ctx, payload)
}
}
// Debug log
func (lg *Logger) Debug(msg interface{}) { lg.Log(msg, logging.Debug) }
// Debug log with formatting
func (lg *Logger) Debugf(s string, args ...interface{}) {
msg := fmt.Sprintf(s, args...)
lg.Log(msg, logging.Debug)
}
// Error log
func (lg *Logger) NewError(msg string) error {
lg.Log(msg, logging.Error)
return errors.New(msg)
}
// Error log with formatting
func (lg *Logger) NewErrorf(s string, args ...interface{}) error {
msg := fmt.Sprintf(s, args...)
lg.Log(msg, logging.Error)
return errors.New(msg)
}
// error log
func (lg *Logger) Error(err error) bool {
if err != nil { lg.Log(err, logging.Error) }
return err != nil
}
// critical log
func (lg *Logger) Panic(msg interface{}) {
if msg == nil { return }
lg.Log(msg, logging.Critical)
lg.logger.Flush()
panic(msg)
}
// critical log
func (lg *Logger) Fatal(msg interface{}) {
if msg == nil { return }
lg.Log(msg, logging.Critical)
lg.logger.Flush()
panic(msg)
}
// type assertion fail log
func (lg *Logger) Reflect(e interface{}) {
msg := "REFLECT VALUE IS NIL"
if e != nil { msg = "REFLECT VALUE IS "+reflect.TypeOf(e).String() }
lg.Log(msg, logging.Error)
}
// debug json output log
func (lg *Logger) DebugJSON(i interface{}) {
b, err := json.Marshal(i); if err != nil { lg.Error(err); return }
lg.Log(string(b), logging.Debug)
}
// error json output log
func (lg *Logger) ErrorJSON(i interface{}) {
b, err := json.Marshal(i); if err != nil { lg.Error(err); return }
lg.Log(string(b), logging.Error)
}