/
main.go
152 lines (131 loc) · 3.11 KB
/
main.go
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package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"net"
"os"
"regexp"
"text/template"
"time"
"github.com/ugorji/go/codec"
)
var (
Version string
GitCommit string
)
func bytes2string(i interface{}) interface{} {
switch v := i.(type) {
case map[string]interface{}:
for key, next := range v {
v[key] = bytes2string(next)
}
return v
case []interface{}:
for key, next := range v {
v[key] = bytes2string(next)
}
return v
case []byte:
str := string(v)
return str
default:
return v
}
}
type inputData struct {
Tag []byte `codec:"toarray"`
Time float64 `codec:"toarray"`
Record map[string]interface{} `codec:"toarray"`
}
func (e *inputData) TimeString() string {
return time.Unix(int64(e.Time), 0).Format("2006/01/02 15:04:05 MST")
}
func (e *inputData) Readable() map[string]interface{} {
o := map[string]interface{}{
"tag": e.Tag,
"time": e.TimeString(),
"unixtime": e.Time,
"record": e.Record,
}
return bytes2string(o).(map[string]interface{})
}
func decodeInput(b []byte) (map[string]interface{}, error) {
var (
mh codec.MsgpackHandle
)
v := inputData{}
dec := codec.NewDecoderBytes(b, &mh)
err := dec.Decode(&v)
if err != nil {
return nil, err
}
return v.Readable(), nil
}
func setupSocket(addrstr string) (*net.UDPConn, error) {
addr, err := net.ResolveUDPAddr("udp", addrstr)
if err != nil {
return nil, err
}
return net.ListenUDP("udp", addr)
}
func main() {
var (
listenPortFlag int
tagRegexpFlag string
remoteAddrFlag string
formatFlag string
versionFlag bool
)
flag.BoolVar(&versionFlag, "v", false, "print version information.")
flag.IntVar(&listenPortFlag, "l", 25000, "udp port for listen.")
flag.StringVar(&tagRegexpFlag, "t", ".*", "filter regexp for tag. (e.g. 'warning$')")
flag.StringVar(&remoteAddrFlag, "r", "", "filter string for remote addr. (e.g. '127.0.0.1')")
flag.StringVar(&formatFlag, "format", "", "output format by go template.")
flag.Parse()
if versionFlag {
fmt.Printf("%s(%s)\n", Version, GitCommit)
os.Exit(0)
}
var outputFormat *template.Template
tagFilter := regexp.MustCompile(tagRegexpFlag)
if formatFlag != "" {
outputFormat = template.Must(template.New("output-format").Parse(formatFlag))
}
var buf []byte
buf = make([]byte, 65507)
addr := fmt.Sprintf(":%d", listenPortFlag)
sock, err := setupSocket(addr)
if err != nil {
log.Fatal(err)
}
for {
rlen, remote, err := sock.ReadFromUDP(buf)
if err != nil {
log.Printf("read error: %s", err.Error())
}
decoded, err := decodeInput(buf[:rlen])
if err != nil {
log.Printf("msgpack decode error: %s", err.Error())
continue
}
if !tagFilter.MatchString(decoded["tag"].(string)) {
continue
}
if remoteAddrFlag != "" && remoteAddrFlag != fmt.Sprint(remote.IP) {
continue
}
decoded["remote"] = fmt.Sprintf("%s:%d", remote.IP, remote.Port)
if outputFormat != nil {
outputFormat.Execute(os.Stdout, decoded)
fmt.Println()
continue
}
b, err := json.Marshal(decoded)
if err != nil {
log.Printf("json encode error: %s", err.Error())
}
fmt.Println(string(b))
}
}