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/
main.go
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/
main.go
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// Copyright 2018 Schibsted
package main
import (
"bufio"
"encoding/json"
"fmt"
"io"
"log"
"net"
"net/http"
"os"
"strconv"
"time"
)
func listenTcp(addr string) <-chan []byte {
l, err := net.Listen("tcp", addr)
if err != nil {
log.Fatal(err)
}
ret := make(chan []byte, 1*1024*1024)
go func() {
for {
conn, err := l.Accept()
if err != nil {
log.Print(err)
continue
}
go func() {
r := bufio.NewReader(conn)
var err error
for err == nil {
var line []byte
line, err = r.ReadBytes('\n')
if len(line) > 0 {
ret <- line
}
}
}()
}
}()
return ret
}
type redirect struct {
fname string
w io.WriteCloser
n int
cc chan struct{}
}
var redirects = make(chan redirect)
func redirectHandler(w http.ResponseWriter, r *http.Request) {
query := r.URL.Query()
apps := query["app"]
ltypes := query["type"]
if len(apps) == 0 || len(ltypes) == 0 {
http.NotFound(w, r)
return
}
fname := apps[0] + "." + ltypes[0]
target := query["target"]
if len(target) == 0 || target[0] == "none" {
// Wait for close confirmation from main thread.
cc := make(chan struct{})
redirects <- redirect{fname, nil, 0, cc}
select {
case <-cc:
fmt.Fprintln(w, "closed")
case <-time.After(2 * time.Second):
fmt.Fprintln(w, "timed out")
}
return
}
f, err := os.OpenFile(target[0], os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
n := 0
ns := query["n"]
if len(ns) > 0 {
n, _ = strconv.Atoi(ns[0])
}
redirects <- redirect{fname, f, n, nil}
}
func main() {
url := os.Args[1]
dir := os.Args[2]
if len(os.Args) > 3 {
ctrlport := os.Args[3]
http.HandleFunc("/redirect", redirectHandler)
go http.ListenAndServe(ctrlport, nil)
}
ch := listenTcp(url)
var files = map[string]struct {
w io.WriteCloser
n int
cc chan struct{}
}{}
running := true
for running {
var msg []byte
select {
case redir := <-redirects:
r := files[redir.fname]
if redir.w != nil {
if r.w != nil {
r.w.Close()
}
r.w = redir.w
r.n = redir.n
}
if redir.cc != nil {
if r.n == 0 {
close(redir.cc)
} else {
r.cc = redir.cc
}
}
files[redir.fname] = r
case msg, running = <-ch:
//
}
if msg == nil {
continue
}
var logm map[string]interface{}
if err := json.Unmarshal(msg, &logm); err != nil {
log.Fatal(err)
}
prog, _ := logm["prog"].(string)
if prog == "" {
prog = "_unknown"
}
ttype, _ := logm["type"].(string)
fname := prog + "." + ttype
r := files[fname]
if r.w == nil {
fname = prog + ".log"
r = files[fname]
if r.w == nil {
f, err := os.OpenFile(dir+"/"+fname, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666)
if err != nil {
log.Fatal(err)
}
r.w = f
files[fname] = r
}
}
var d []byte
var err error
if r.n > 0 {
// Always expand redirected logs.
d, err = json.MarshalIndent(&logm, "", "\t")
} else {
switch ttype {
case "log", "EMERG", "ALERT", "CRIT", "ERR", "WARNING", "NOTICE", "INFO", "DEBUG":
d, err = json.Marshal(&logm)
default:
d, err = json.MarshalIndent(&logm, "", "\t")
}
}
if err != nil {
d = []byte(err.Error())
}
d = append(d, byte('\n'))
r.w.Write(d)
if r.n == 1 {
if r.cc != nil {
close(r.cc)
}
r.w.Close()
delete(files, fname)
} else if r.n > 0 {
r.n--
files[fname] = r
}
}
}