136 lines
3.2 KiB
Go
136 lines
3.2 KiB
Go
package main
|
|
|
|
import (
|
|
"container/ring"
|
|
"flag"
|
|
"fmt"
|
|
"net/http"
|
|
"os"
|
|
"time"
|
|
|
|
"github.com/gorilla/websocket"
|
|
syslog "gopkg.in/mcuadros/go-syslog.v2"
|
|
"gopkg.in/mcuadros/go-syslog.v2/format"
|
|
)
|
|
|
|
var circbuf *ring.Ring
|
|
var hub Hub
|
|
var upgrader = websocket.Upgrader{
|
|
ReadBufferSize: 1024,
|
|
WriteBufferSize: 1024,
|
|
}
|
|
|
|
func init() {
|
|
hub = NewHub()
|
|
}
|
|
|
|
func syslogdHandler(channel syslog.LogPartsChannel) {
|
|
for logParts := range channel {
|
|
hub.logMessages <- logParts
|
|
fmt.Println(logParts)
|
|
circbuf.Value = logParts
|
|
circbuf = circbuf.Next()
|
|
}
|
|
}
|
|
|
|
func httpHandler(w http.ResponseWriter, r *http.Request) {
|
|
circbuf.Do(func(x interface{}) {
|
|
if x == nil {
|
|
return
|
|
}
|
|
logmsg := x.(format.LogParts)
|
|
if logmsg["message"] == nil {
|
|
return
|
|
}
|
|
c := logmsg["message"].(string)
|
|
w.Write([]byte(c))
|
|
w.Write([]byte("\n"))
|
|
})
|
|
}
|
|
|
|
func wsHandler(w http.ResponseWriter, r *http.Request) {
|
|
conn, err := upgrader.Upgrade(w, r, nil)
|
|
if err != nil {
|
|
return
|
|
}
|
|
httpHandler(w, r)
|
|
client := Client{messages: make(chan format.LogParts)}
|
|
hub.Register <- client
|
|
|
|
// Allow collection of memory referenced by the caller by doing all work in
|
|
// new goroutines.
|
|
go func(conn *websocket.Conn, c Client) {
|
|
defer func() {
|
|
hub.Unregister <- c
|
|
conn.Close()
|
|
}()
|
|
for {
|
|
select {
|
|
case message, ok := <-c.messages:
|
|
conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
|
|
if !ok {
|
|
// The hub closed the channel.
|
|
conn.WriteMessage(websocket.CloseMessage, []byte{})
|
|
return
|
|
}
|
|
|
|
w, err := conn.NextWriter(websocket.TextMessage)
|
|
if err != nil {
|
|
return
|
|
}
|
|
if msg, ok := message["message"]; ok {
|
|
w.Write([]byte(msg.(string)))
|
|
}
|
|
|
|
if err := w.Close(); err != nil {
|
|
return
|
|
}
|
|
// TODO: ticker/ping
|
|
}
|
|
}
|
|
}(conn, client)
|
|
}
|
|
|
|
func main() {
|
|
var err error
|
|
syslogSocketPath := flag.String("syslogd-socket", "", "The socket to listen to syslog addresses")
|
|
// dumpSocketPath := flag.String("dump-socket", "/run/buffer.sock", "The socket that user will connect to in order to receive logs")
|
|
bufsize := flag.Int("buffer-size", 1000, "Number of messages to keep")
|
|
syslogAddr := flag.String("syslog-addr", "127.0.0.1:9514", "Address:port where to listen for syslog messages")
|
|
queryAddr := flag.String("query-addr", "127.0.0.1:9080", "Address:port where to bind the query service")
|
|
flag.Parse()
|
|
|
|
channel := make(chan format.LogParts)
|
|
handler := syslog.NewChannelHandler(channel)
|
|
|
|
server := syslog.NewServer()
|
|
server.SetFormat(syslog.RFC5424)
|
|
server.SetHandler(handler)
|
|
if *syslogSocketPath != "" {
|
|
if err = server.ListenUnixgram(*syslogSocketPath); err != nil {
|
|
fmt.Fprintln(os.Stderr, "argh", err)
|
|
os.Exit(1)
|
|
}
|
|
fmt.Printf("Binding socket `%s` [syslog]\n", *syslogSocketPath)
|
|
} else {
|
|
fmt.Printf("Binding address `%s` [syslog]\n", *syslogAddr)
|
|
if err = server.ListenUDP(*syslogAddr); err != nil {
|
|
fmt.Fprintln(os.Stderr, "argh", err)
|
|
os.Exit(1)
|
|
}
|
|
}
|
|
circbuf = ring.New(*bufsize)
|
|
if err = server.Boot(); err != nil {
|
|
fmt.Fprintln(os.Stderr, "argh", err)
|
|
os.Exit(1)
|
|
}
|
|
go hub.Run()
|
|
go syslogdHandler(channel)
|
|
|
|
http.HandleFunc("/", httpHandler)
|
|
http.HandleFunc("/ws", wsHandler)
|
|
fmt.Printf("Binding address `%s` [http]\n", *queryAddr)
|
|
http.ListenAndServe(*queryAddr, nil)
|
|
|
|
server.Wait()
|
|
}
|