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package goreplay
import (
"bufio"
"compress/gzip"
"errors"
"fmt"
"github.com/buger/goreplay/internal/size"
"io"
"log"
"math/rand"
"os"
"path/filepath"
"runtime/debug"
"sort"
"strconv"
"strings"
"sync"
"time"
)
var letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
var instanceID string
func init() {
instanceID = randSeq(8)
}
func randSeq(n int) string {
b := make([]rune, n)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}
var dateFileNameFuncs = map[string]func(*FileOutput) string{
"%Y": func(o *FileOutput) string { return time.Now().Format("2006") },
"%m": func(o *FileOutput) string { return time.Now().Format("01") },
"%d": func(o *FileOutput) string { return time.Now().Format("02") },
"%H": func(o *FileOutput) string { return time.Now().Format("15") },
"%M": func(o *FileOutput) string { return time.Now().Format("04") },
"%S": func(o *FileOutput) string { return time.Now().Format("05") },
"%NS": func(o *FileOutput) string { return fmt.Sprint(time.Now().Nanosecond()) },
"%r": func(o *FileOutput) string { return string(o.currentID) },
"%t": func(o *FileOutput) string { return string(o.payloadType) },
"%i": func(o *FileOutput) string { return instanceID },
}
// FileOutputConfig ...
type FileOutputConfig struct {
FlushInterval time.Duration `json:"output-file-flush-interval"`
SizeLimit size.Size `json:"output-file-size-limit"`
OutputFileMaxSize size.Size `json:"output-file-max-size-limit"`
QueueLimit int `json:"output-file-queue-limit"`
Append bool `json:"output-file-append"`
BufferPath string `json:"output-file-buffer"`
onClose func(string)
}
// FileOutput output plugin
type FileOutput struct {
sync.RWMutex
pathTemplate string
currentName string
file *os.File
QueueLength int
writer io.Writer
requestPerFile bool
currentID []byte
payloadType []byte
closed bool
currentFileSize int
totalFileSize size.Size
config *FileOutputConfig
}
// NewFileOutput constructor for FileOutput, accepts path
func NewFileOutput(pathTemplate string, config *FileOutputConfig) *FileOutput {
o := new(FileOutput)
o.pathTemplate = pathTemplate
o.config = config
if strings.Contains(pathTemplate, "%r") {
o.requestPerFile = true
}
if config.FlushInterval == 0 {
config.FlushInterval = 100 * time.Millisecond
}
go func() {
for {
time.Sleep(config.FlushInterval)
if o.IsClosed() {
break
}
o.flush()
}
}()
return o
}
func getFileIndex(name string) int {
ext := filepath.Ext(name)
withoutExt := strings.TrimSuffix(name, ext)
if idx := strings.LastIndex(withoutExt, "_"); idx != -1 {
if i, err := strconv.Atoi(withoutExt[idx+1:]); err == nil {
return i
}
}
return -1
}
func setFileIndex(name string, idx int) string {
idxS := strconv.Itoa(idx)
ext := filepath.Ext(name)
withoutExt := strings.TrimSuffix(name, ext)
if i := strings.LastIndex(withoutExt, "_"); i != -1 {
if _, err := strconv.Atoi(withoutExt[i+1:]); err == nil {
withoutExt = withoutExt[:i]
}
}
return withoutExt + "_" + idxS + ext
}
func withoutIndex(s string) string {
if i := strings.LastIndex(s, "_"); i != -1 {
return s[:i]
}
return s
}
type sortByFileIndex []string
func (s sortByFileIndex) Len() int {
return len(s)
}
func (s sortByFileIndex) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s sortByFileIndex) Less(i, j int) bool {
if withoutIndex(s[i]) == withoutIndex(s[j]) {
return getFileIndex(s[i]) < getFileIndex(s[j])
}
return s[i] < s[j]
}
func (o *FileOutput) filename() string {
o.RLock()
defer o.RUnlock()
path := o.pathTemplate
for name, fn := range dateFileNameFuncs {
path = strings.Replace(path, name, fn(o), -1)
}
if !o.config.Append {
nextChunk := false
if o.currentName == "" ||
((o.config.QueueLimit > 0 && o.QueueLength >= o.config.QueueLimit) ||
(o.config.SizeLimit > 0 && o.currentFileSize >= int(o.config.SizeLimit))) {
nextChunk = true
}
ext := filepath.Ext(path)
withoutExt := strings.TrimSuffix(path, ext)
if matches, err := filepath.Glob(withoutExt + "*" + ext); err == nil {
if len(matches) == 0 {
return setFileIndex(path, 0)
}
sort.Sort(sortByFileIndex(matches))
last := matches[len(matches)-1]
fileIndex := 0
if idx := getFileIndex(last); idx != -1 {
fileIndex = idx
if nextChunk {
fileIndex++
}
}
return setFileIndex(last, fileIndex)
}
}
return path
}
func (o *FileOutput) updateName() {
name := filepath.Clean(o.filename())
o.Lock()
o.currentName = name
o.Unlock()
}
// PluginWrite writes message to this plugin
func (o *FileOutput) PluginWrite(msg *Message) (n int, err error) {
if o.requestPerFile {
o.Lock()
meta := payloadMeta(msg.Meta)
o.currentID = meta[1]
o.payloadType = meta[0]
o.Unlock()
}
o.updateName()
o.Lock()
defer o.Unlock()
if o.file == nil || o.currentName != o.file.Name() {
o.closeLocked()
o.file, err = os.OpenFile(o.currentName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0660)
o.file.Sync()
if strings.HasSuffix(o.currentName, ".gz") {
o.writer = gzip.NewWriter(o.file)
} else {
o.writer = bufio.NewWriter(o.file)
}
if err != nil {
log.Fatal(o, "Cannot open file %q. Error: %s", o.currentName, err)
}
o.QueueLength = 0
}
var nn int
n, err = o.writer.Write(msg.Meta)
nn, err = o.writer.Write(msg.Data)
n += nn
nn, err = o.writer.Write(payloadSeparatorAsBytes)
n += nn
o.totalFileSize += size.Size(n)
o.currentFileSize += n
o.QueueLength++
if Settings.OutputFileConfig.OutputFileMaxSize > 0 && o.totalFileSize >= Settings.OutputFileConfig.OutputFileMaxSize {
return n, errors.New("File output reached size limit")
}
return n, err
}
func (o *FileOutput) flush() {
// Don't exit on panic
defer func() {
if r := recover(); r != nil {
Debug(0, "[OUTPUT-FILE] PANIC while file flush: ", r, o, string(debug.Stack()))
}
}()
o.Lock()
defer o.Unlock()
if o.file != nil {
if strings.HasSuffix(o.currentName, ".gz") {
o.writer.(*gzip.Writer).Flush()
} else {
o.writer.(*bufio.Writer).Flush()
}
if stat, err := o.file.Stat(); err == nil {
o.currentFileSize = int(stat.Size())
} else {
Debug(0, "[OUTPUT-HTTP] error accessing file size", err)
}
}
}
func (o *FileOutput) String() string {
return "File output: " + o.file.Name()
}
func (o *FileOutput) closeLocked() error {
if o.file != nil {
if strings.HasSuffix(o.currentName, ".gz") {
o.writer.(*gzip.Writer).Close()
} else {
o.writer.(*bufio.Writer).Flush()
}
o.file.Close()
if o.config.onClose != nil {
o.config.onClose(o.file.Name())
}
}
o.closed = true
o.currentFileSize = 0
return nil
}
// Close closes the output file that is being written to.
func (o *FileOutput) Close() error {
o.Lock()
defer o.Unlock()
return o.closeLocked()
}
// IsClosed returns if the output file is closed or not.
func (o *FileOutput) IsClosed() bool {
o.Lock()
defer o.Unlock()
return o.closed
}
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