main.go
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package gologger
import (
"fmt"
"net/http"
"net/http/httputil"
"os"
"path/filepath"
"runtime"
"strings"
"sync"
"time"
)
const (
MaxLogSize5MB int64 = 5 * 1024 * 1024
MaxLogSize1MB int64 = 1 * 1024 * 1024
MaxLogSize500KB int64 = 500 * 1024
MaxLogSize100KB int64 = 100 * 1024
MaxLogSize512B int64 = 512
logDirName = "log"
)
type Logger struct {
mu *sync.Mutex
outputFile *os.File
outputFileName string
maxFileSize int64
splitCount int
}
func New(name string, maxFileSize int64) (logger *Logger, err error) {
logger = &Logger{}
logger.outputFileName = name + "-log"
logger.mu = &sync.Mutex{}
logger.maxFileSize = maxFileSize
err = os.Mkdir(logDirName, os.ModePerm)
if err != nil {
if !os.IsExist(err) {
fmt.Printf("logger: mkdir: couldn't create event log directory\n")
return nil, err
}
}
date := strings.Replace(time.Now().Format(time.RFC3339), ":", ".", -1)
logger.outputFileName += "_" + date + ".txt"
path := filepath.Join(logDirName, logger.outputFileName)
logger.outputFile, err = os.Create(path)
if err != nil {
fmt.Printf("logger: new: couldn't create event log file\n")
return nil, err
}
return logger, nil
}
func (l *Logger) Print(format string, v ...interface{}) {
msg := fmt.Sprintf(format, v...)
fmt.Printf(time.Now().Format(time.RFC3339) + ": " + msg + "\n")
}
func (l *Logger) Log(format string, v ...interface{}) {
if l.outputFile != nil {
l.mu.Lock()
defer l.mu.Unlock()
msg := fmt.Sprintf(format, v...)
s := time.Now().Format(time.RFC3339) + ": " + msg + "\n"
if l.shouldSplit(len(s)) {
l.split()
}
l.outputFile.WriteString(s)
}
}
func (l *Logger) LogRequest(req *http.Request, userid string) {
if l.outputFile != nil {
if userid == "" {
userid = "-"
}
var b strings.Builder
b.WriteString("Request:\n")
// CLF-like header
ts := time.Now().Format(time.RFC3339)
fmt.Fprintf(&b, "%s %s\n", req.RemoteAddr, ts)
body, err := httputil.DumpRequest(req, true)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
} else {
b.WriteString(string(body))
}
b.WriteString("\n")
msg := b.String()
l.mu.Lock()
defer l.mu.Unlock()
if l.shouldSplit(len(msg)) {
l.split()
}
l.outputFile.WriteString(msg)
}
}
func (l *Logger) LogResponse(w http.ResponseWriter, req *http.Request, duration time.Duration) {
if l.outputFile != nil {
var b strings.Builder
b.WriteString("Response:\n")
fmt.Fprintf(&b, "%s %s\n", req.Method, req.RequestURI)
for k, v := range w.Header() {
fmt.Fprintf(&b, "%s: %s\n", k, v)
}
fmt.Fprintf(&b, "\nCompleted in: %v\n", duration)
b.WriteString("==============================================================\n\n")
msg := b.String()
l.mu.Lock()
defer l.mu.Unlock()
if l.shouldSplit(len(msg)) {
l.split()
}
l.outputFile.WriteString(msg)
}
}
func (l *Logger) Trace(format string, v ...interface{}) {
if l.outputFile != nil {
l.mu.Lock()
defer l.mu.Unlock()
_, file, line, ok := runtime.Caller(1)
s := ""
msg := fmt.Sprintf(format, v...)
if ok {
s = fmt.Sprintf("%s: %s %d: %s\n", time.Now().Format(time.RFC3339), file, line, msg)
} else {
s = fmt.Sprintf(time.Now().Format(time.RFC3339) + ": [can't retreive stack details]:" + msg + "\n")
}
if l.shouldSplit(len(s)) {
l.split()
}
l.outputFile.WriteString(s)
}
}
func (l *Logger) Close() {
if l.outputFile != nil {
err := l.outputFile.Close()
if err != nil {
fmt.Printf("logger: on exit: couldn't close event log file\n")
}
}
}
func (l *Logger) split() {
// close old file
err := l.outputFile.Close()
if err != nil {
fmt.Printf("logger: split: couldn't close event file\n")
return
}
l.splitCount++
// open new file
var errnew error
path := filepath.Join(logDirName, l.outputFileName+fmt.Sprintf("(%d)", l.splitCount))
l.outputFile, errnew = os.Create(path)
if errnew != nil {
fmt.Printf("logger: split: couldn't create event log file\n")
}
}
func (l *Logger) shouldSplit(nextEntrySize int) bool {
stats, _ := l.outputFile.Stat()
return int64(nextEntrySize) >= (l.maxFileSize - stats.Size())
}