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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"io"
"log"
"net"
"os"
"github.com/devxfactor/quicklog/memstore"
"github.com/devxfactor/quicklog/socket"
"net/http"
)
var (
TimestampFormat = "2006-01-02T15:04:05Z"
)
func ServeLoggers(socketName string, mstore memstore.Memstore) {
sock, err := net.Listen("unix", socketName)
if err != nil {
log.Fatalf("Error listening on unix:%s: %v", socketName, err)
}
for {
conn, err := sock.Accept()
if err != nil {
log.Fatalf("Error accepting connection on unix:%s: %v", socketName, err)
}
if unixConn, ok := conn.(*net.UnixConn); ok {
if err := unixConn.CloseWrite(); err != nil {
fmt.Errorf("Error on CloseWrite of unix:%v: %v", socketName, err)
}
}
// start reader (for logger)
go readInput(socketName, conn, mstore)
}
}
func readInput(socketName string, conn net.Conn, mstore memstore.Memstore) {
reader := bufio.NewReader(conn)
for {
line, err := reader.ReadString('\n')
if len(line) > 0 {
mstore.Log(line)
}
if err != nil {
if err != io.EOF {
fmt.Errorf("Error reading unix:%s: %v", socketName, err)
}
conn.Close()
return
}
}
}
func ServeTailers(socketName string, mstore memstore.Memstore) {
sock, err := net.Listen("unix", socketName)
if err != nil {
log.Fatalf("Error listening on unix:%s: %v", socketName, err)
}
for {
conn, err := sock.Accept()
if err != nil {
log.Fatalf("Error accepting connection on unix:%s: %v", socketName, err)
}
if unixConn, ok := conn.(*net.UnixConn); ok {
if err := unixConn.CloseRead(); err != nil {
fmt.Errorf("Error on CloseRead of unix:%v: %v", socketName, err)
}
}
// start writer (for tailer)
go func() {
writer := bufio.NewWriter(conn)
err := mstore.Tail(func(line string) error {
nWritten := 0
for nWritten < len(line) {
nWrote, err := writer.Write([]byte(line[nWritten:]))
if err != nil {
return err
}
nWritten += nWrote
}
writer.Flush()
return nil
})
if err != nil {
if err != io.EOF {
fmt.Errorf("Error writing unix:%s: %v", socketName, err)
}
conn.Close()
return
}
}()
}
}
func ServeHttpTailers(listenHostPort string, mstore memstore.Memstore) {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
flusher, ok := w.(http.Flusher)
if !ok {
panic("expected http.ResponseWriter to be an http.Flusher")
}
mstore.Tail(func(line string) error {
fmt.Fprint(w, line)
flusher.Flush()
return nil
})
})
log.Print("Listening on "+ listenHostPort)
log.Fatal(http.ListenAndServe(listenHostPort, nil))
}
func main() {
mstore := memstore.NewMemstore()
go ServeLoggers("./quicklogger.sock", mstore)
go ServeTailers("./quicktailer.sock", mstore)
go ServeHttpTailers("localhost:8109", mstore)
socket.WaitForShutdownSignal()
os.Exit(0)
}