/
logger.go
198 lines (182 loc) · 4.26 KB
/
logger.go
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package geetplaban
import (
"bytes"
"fmt"
"github.com/Sirupsen/logrus"
"os"
"path/filepath"
"sort"
"strconv"
"syscall"
"time"
)
const (
MAX_LOG_BUFFER = 100 * 1024
WRITE_SIZE = 8000
MAX_LOG_INTERVAL = 2 * time.Second
MAX_ROLLOVER_SIZE = 2 * 1024 * 1024 * 1024
)
type LogWriter struct {
logs chan []byte
}
func NewLogWriter(inp chan []byte) *LogWriter {
return &LogWriter{inp}
}
func (mywriter *LogWriter) Write(p []byte) (n int, err error) {
mywriter.logs <- p
return len(p), nil
}
type Logger struct {
events chan []byte
outfile string
file *os.File
buffer *bytes.Buffer
backups int
outdir string
regxp string
writer *LogWriter
log *logrus.Logger
rolsize int
fsize int
t *time.Ticker
}
func (logger *Logger) RollOver() {
files, err := filepath.Glob(logger.regxp)
if err != nil {
fmt.Printf("Some error during rollover %v\n", err)
os.Exit(1)
return
}
var index_nums []int
num_name := make(map[int]string)
for _, file := range files {
index_name := file[len(logger.outfile)+1:]
if index_num, err := strconv.Atoi(index_name); err == nil {
index_nums = append(index_nums, index_num)
num_name[index_num] = file
}
}
sort.Ints(index_nums)
to_be_deleted := len(index_nums) - logger.backups + 1
i := to_be_deleted
if to_be_deleted > 0 {
for ; to_be_deleted > 0; to_be_deleted-- {
err = os.Remove(num_name[index_nums[len(index_nums)-to_be_deleted]])
if err != nil && !os.IsNotExist(err) {
fmt.Printf("Some error in removing file\n")
os.Exit(1)
}
}
index_nums = index_nums[:len(index_nums)-i]
}
i = len(index_nums)
for i > 0 {
err = os.Rename(num_name[index_nums[i-1]], fmt.Sprintf("%s.%d", logger.outfile, i+1))
if err != nil {
fmt.Printf("Error in renaming file %v\n", err)
}
i--
}
logger.file.Close()
err = os.Rename(logger.outfile, fmt.Sprintf("%s.%d", logger.outfile, 1))
if err != nil {
fmt.Printf("Error in renaming file %v\n", err)
}
file, fsize := openAndLockFile(logger.outfile)
logger.fsize = int(fsize)
logger.file = file
}
func openAndLockFile(outfile string) (*os.File, int64) {
file, err := os.Open(outfile)
var fsize int64
if err != nil {
if os.IsNotExist(err) {
fsize = 0
} else {
fmt.Printf("Failed to open file:%v, err:%v\n", file, err)
os.Exit(1)
}
} else {
fsize = GetFileSizeFile(file)
file.Close()
}
if fsize < 0 {
file.Close()
fmt.Printf("Problem in getting file size\n")
os.Exit(1)
}
file.Close()
file, err = os.OpenFile(outfile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
fmt.Printf("Failed to open file:%v, err:%v\n", file, err)
os.Exit(1)
}
fd := file.Fd()
if syscall.Flock(int(fd), syscall.LOCK_EX|syscall.LOCK_NB) != nil {
file.Close()
fmt.Printf("Unable to lock log file\n")
os.Exit(1)
}
return file, fsize
}
var LOG *logrus.Logger
func NewLogger() *Logger {
outfile := GetConfig().GetLogFile()
max_back_up := 10
max_log_size := GetConfig().GetLogRollSize()
events := make(chan []byte, 40960)
outdir := filepath.Dir(outfile)
buf := make([]byte, MAX_LOG_BUFFER)
buffer := bytes.NewBuffer(buf)
buffer.Reset()
file, fsize := openAndLockFile(outfile)
regexp := outfile + ".*"
writer := NewLogWriter(events)
logrloger := logrus.New()
loglevel, err := logrus.ParseLevel(GetConfig().GetLogLevel())
if err != nil {
panic(err)
}
logrloger.Level = loglevel
logrloger.Out = writer
logrloger.Formatter = &logrus.TextFormatter{DisableColors: true,
TimestampFormat: "2006-01-02T15:04:05"}
t := time.NewTicker(MAX_LOG_INTERVAL)
LOG = logrloger
return &Logger{events, outfile, file, buffer, max_back_up,
outdir, regexp, writer, logrloger, max_log_size, int(fsize), t}
}
func (logger *Logger) flush() {
n, err := logger.file.Write(logger.buffer.Bytes())
if err != nil {
fmt.Printf("Logging error\n")
os.Exit(1)
}
logger.fsize += n
logger.buffer.Reset()
if logger.fsize > logger.rolsize {
logger.RollOver()
}
}
func (logger *Logger) addMsg(msg []byte) {
logger.buffer.Write(msg)
if logger.buffer.Len() >= WRITE_SIZE {
logger.flush()
}
}
func logSyncer(logger *Logger) {
for {
select {
case msg := <-logger.events:
logger.addMsg(msg)
case _ = <-logger.t.C:
if logger.buffer.Len() > 0 {
logger.flush()
}
}
}
}
func init_logger() {
logger := NewLogger()
go logSyncer(logger)
}