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server.go
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server.go
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package core
import (
"fmt"
"io"
"net"
"net/http"
"net/http/httputil"
"net/url"
"sync/atomic"
"time"
"github.com/gorilla/websocket"
"github.com/juju/loggo"
)
type Server struct {
LogLevel loggo.Level
Pattern string
ListenAddr string
TLS bool
CertPath string
KeyPath string
Proxy string
Upgrader *websocket.Upgrader
CreatedAt time.Time
Opened uint64
Closed uint64
Uploaded uint64
Downloaded uint64
}
func (server *Server) HandleWebSocket(w http.ResponseWriter, r *http.Request) {
c, err := server.Upgrader.Upgrade(w, r, nil)
if err != nil {
logger.Debugf(err.Error())
return
}
ws := &WebSocket{
conn: c,
}
atomic.AddUint64(&server.Opened, 1)
defer atomic.AddUint64(&server.Closed, 1)
host := r.Header.Get("WebSocks-Host")
logger.Debugf("Dial %s", host)
conn, err := net.Dial("tcp", host)
if err != nil {
if err != nil {
logger.Debugf(err.Error())
}
return
}
defer conn.Close()
go func() {
downloaded, err := io.Copy(conn, ws)
atomic.AddUint64(&server.Downloaded, uint64(downloaded))
if err != nil {
logger.Debugf(err.Error())
return
}
}()
uploaded, err := io.Copy(ws, conn)
atomic.AddUint64(&server.Uploaded, uint64(uploaded))
if err != nil {
logger.Debugf(err.Error())
return
}
return
}
func (server *Server) Status(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(fmt.Sprintf("%ds: opened %d, closed %d, uploaded %d bytes, downloaded %d bytes", int(time.Since(server.CreatedAt).Seconds()), server.Opened, server.Closed, server.Uploaded, server.Downloaded)))
}
func (server *Server) Listen() (err error) {
logger.SetLogLevel(server.LogLevel)
go func() {
for {
time.Sleep(time.Second)
logger.Debugf("%ds: opened %d, closed %d, uploaded %d bytes, downloaded %d bytes", int(time.Since(server.CreatedAt).Seconds()), server.Opened, server.Closed, server.Uploaded, server.Downloaded)
}
}()
mux := http.NewServeMux()
mux.HandleFunc(server.Pattern, server.HandleWebSocket)
mux.HandleFunc("/status", server.Status)
if server.Proxy != "" {
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
remote, err := url.Parse(server.Proxy)
if err != nil {
panic(err)
}
proxy := httputil.NewSingleHostReverseProxy(remote)
proxy.ServeHTTP(w, r)
})
}
s := http.Server{
Addr: server.ListenAddr,
Handler: mux,
}
if !server.TLS {
err = s.ListenAndServe()
if err != nil {
return err
}
return
} else {
err = s.ListenAndServeTLS(server.CertPath, server.KeyPath)
if err != nil {
return err
}
}
return
}