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server.go
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server.go
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// Copyright 2013 Liviu G. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package goscgi
import (
"log"
"net"
"os"
"os/signal"
"strings"
"sync"
"time"
)
type Server struct {
Settings *Settings
Handlers []Handler
Close chan bool
WaitGroup sync.WaitGroup
}
type Handler struct {
Path string
Func HandlerFunc
}
type HandlerFunc func(*Request) *Response
var (
RespNotFound = NewResponse(RespCodeNotFound, RespTypeText, RespCodeNotFound)
RespBadRequest = NewResponse(RespCodeBadRequest, RespTypeText, RespCodeBadRequest)
RespInternalError = NewResponse(RespCodeInternalError, RespTypeText, RespCodeInternalError)
)
func NewServer(s *Settings) *Server {
srv := &Server{}
srv.Settings = s
srv.Close = make(chan bool)
return srv
}
func (srv *Server) AddHandler(path string, handler HandlerFunc) {
srv.Handlers = append(srv.Handlers, Handler{path, handler})
}
func (srv *Server) ListenTcp(port string) error {
addr, err := net.ResolveTCPAddr("tcp", port)
if err != nil {
return err
}
listener, err := net.ListenTCP("tcp", addr)
if err != nil {
return err
}
defer listener.Close()
defer srv.WaitGroup.Wait()
srv.listenLoop(listener)
return nil
}
func (srv *Server) ListenUnix(addrStr string) error {
addr, err := net.ResolveUnixAddr("unix", addrStr)
if err != nil {
return err
}
listener, err := net.ListenUnix("unix", addr)
if err != nil {
return err
}
defer listener.Close()
defer srv.WaitGroup.Wait()
srv.listenLoop(listener)
return nil
}
type anyListener interface {
Accept() (net.Conn, error)
SetDeadline(time.Time) error
}
func (srv *Server) listenLoop(listener anyListener) {
osInterrupt := make(chan os.Signal, 1)
signal.Notify(osInterrupt, os.Interrupt)
listenTimeout := srv.Settings.ListenTimeout
for {
select {
case <-srv.Close:
log.Println("Server.listenLoop, <-srv.Close: closing...")
return
case <-osInterrupt:
log.Println("Server.listenLoop, <-osInterrupt: terminating...")
return
default: // if default -> go and execute the rest of the loop
}
listener.SetDeadline(time.Now().Add(listenTimeout))
conn, err := listener.Accept()
if err == nil {
srv.WaitGroup.Add(1)
go srv.handleConn(conn)
} /* else {
log.Println("Server.listenLoop, listener.Accept():", err.Error())
}*/
}
}
func (srv *Server) handleConn(conn net.Conn) {
defer srv.WaitGroup.Done()
defer conn.Close()
req, err := ReadRequest(conn, srv.Settings)
if err != nil {
log.Println("Server.handleConn, ReadRequest:", err.Error())
err = RespBadRequest.Write(conn, srv.Settings.WriteTimeout)
if err != nil {
log.Println("Server.handleConn, RespBadRequest.Send:", err.Error())
}
} else {
srv.handleReq(req)
}
}
func (srv *Server) handleReq(req *Request) {
var err error
timeout := srv.Settings.WriteTimeout
if handler := srv.getHandler(req.URL.Path); handler != nil {
if resp := handler(req); resp != nil {
err = resp.Write(req.Connection, timeout)
} else {
err = RespInternalError.Write(req.Connection, timeout)
}
} else {
err = RespNotFound.Write(req.Connection, timeout)
}
if err != nil {
log.Println("Server.handleReq:", err.Error())
}
}
func (srv *Server) getHandler(path string) HandlerFunc {
for _, handler := range srv.Handlers {
if strings.HasPrefix(path, handler.Path) {
return handler.Func
}
}
return nil
}