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server.go
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server.go
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package kocha
import (
"fmt"
"log"
"net"
"net/http"
"os"
"os/signal"
"reflect"
"runtime"
"strconv"
"sync"
"syscall"
)
const fdKey = "KOCHA_FD"
func handler(writer http.ResponseWriter, req *http.Request) {
controller, method, args := appConfig.router.dispatch(req)
if controller == nil {
c := NewErrorController(http.StatusNotFound)
cValue := reflect.ValueOf(c)
mValue := reflect.ValueOf(c.Get)
controller = &cValue
method = &mValue
args = []reflect.Value{}
}
render(req, writer, controller, method, args)
}
func render(req *http.Request, writer http.ResponseWriter, controller, method *reflect.Value, args []reflect.Value) {
request := NewRequest(req)
response := NewResponse(writer)
var (
cc *Controller
result []reflect.Value
)
defer func() {
defer func() {
if err := recover(); err != nil {
logStackAndError(err)
response.StatusCode = http.StatusInternalServerError
http.Error(response, http.StatusText(response.StatusCode), response.StatusCode)
}
}()
if err := recover(); err != nil {
logStackAndError(err)
c := NewErrorController(http.StatusInternalServerError)
if cc == nil {
cc = &Controller{}
cc.Request = request
cc.Response = response
}
c.Controller = cc
r := c.Get()
result = []reflect.Value{reflect.ValueOf(r)}
}
for _, m := range appConfig.Middlewares {
m.After(cc)
}
response.WriteHeader(response.StatusCode)
result[0].Interface().(Result).Proc(response)
}()
request.Body = http.MaxBytesReader(writer, request.Body, appConfig.MaxClientBodySize)
ac := controller.Elem()
ccValue := ac.FieldByName("Controller")
switch c := ccValue.Interface().(type) {
case Controller:
cc = &c
case *Controller:
cc = &Controller{}
ccValue.Set(reflect.ValueOf(cc))
ccValue = ccValue.Elem()
default:
panic(fmt.Errorf("BUG: Controller field must be struct of %T or that pointer, but %T", cc, c))
}
cc.Name = ac.Type().Name()
cc.Layout = appConfig.DefaultLayout
cc.Context = make(Context)
cc.Request = request
cc.Response = response
cc.Params.Values = request.Form
if err := request.ParseMultipartForm(appConfig.MaxClientBodySize); err != nil {
panic(err)
}
for _, m := range appConfig.Middlewares {
m.Before(cc)
}
ccValue.Set(reflect.ValueOf(*cc))
result = method.Call(args)
}
// Run starts Kocha app.
//
// addr is string of address for bind.
func Run(addr string) {
if !initialized {
log.Fatalln("Uninitialized. Please call the kocha.Init() before kocha.Run()")
}
if addr == "" {
addr = DefaultHttpAddr
}
l, reloaded := serverListener(addr)
listener := &waitableListener{
Listener: l,
wg: &sync.WaitGroup{},
}
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGHUP)
go func() {
switch <-c {
case syscall.SIGHUP:
pid := gracefulRestart(listener)
Log.Warn("graceful restarted. new pid: %d", pid)
if err := listener.Close(); err != nil {
panic(err)
}
}
}()
server := &http.Server{
Handler: http.HandlerFunc(handler),
}
if !reloaded {
fmt.Printf("Listen on %s, pid %d\n", addr, os.Getpid())
}
server.Serve(listener)
listener.wg.Wait()
}
func gracefulRestart(listener *waitableListener) (pid int) {
pwd, err := os.Getwd()
if err != nil {
panic(err)
}
fdValue := reflect.Indirect(reflect.Indirect(reflect.ValueOf(listener.Listener)).FieldByName("fd"))
sysfd := uintptr(fdValue.FieldByName("sysfd").Int())
proc, err := os.StartProcess(os.Args[0], os.Args, &os.ProcAttr{
Dir: pwd,
Env: append(os.Environ(), fmt.Sprintf("%s=%d", fdKey, sysfd)),
Files: []*os.File{os.Stdin, os.Stdout, os.Stderr, os.NewFile(sysfd, "sysfile")},
})
if err != nil {
panic(err)
}
return proc.Pid
}
func serverListener(addr string) (listener net.Listener, reloaded bool) {
if fdStr := os.Getenv(fdKey); fdStr != "" {
fd, err := strconv.Atoi(fdStr)
if err != nil {
panic(err)
}
file := os.NewFile(uintptr(fd), "listen socket")
l, err := net.FileListener(file)
if err != nil {
panic(err)
}
return l, true
}
tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
panic(err)
}
l, err := net.ListenTCP("tcp", tcpAddr)
if err != nil {
panic(err)
}
return l, false
}
type waitableListener struct {
net.Listener
wg *sync.WaitGroup
}
func (l *waitableListener) Accept() (net.Conn, error) {
conn, err := l.Listener.Accept()
if err != nil {
return conn, err
}
l.wg.Add(1)
return &waitableConn{Conn: conn, wg: l.wg}, nil
}
type waitableConn struct {
net.Conn
wg *sync.WaitGroup
}
func (c *waitableConn) Close() error {
if err := c.Conn.Close(); err != nil {
return err
}
c.wg.Done()
return nil
}
func logStackAndError(err interface{}) {
buf := make([]byte, 4096)
runtime.Stack(buf, false)
Log.Error("%v\n%v", err, string(buf))
}