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server.go
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server.go
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package grace
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"gitee.com/Trisia/gotlcp/tlcp"
"io/ioutil"
"log"
"net"
"net/http"
"os"
"os/exec"
"os/signal"
"strings"
"syscall"
"time"
)
// Server embedded http.Server
type Server struct {
*http.Server
ln net.Listener
SignalHooks map[int]map[os.Signal][]func()
sigChan chan os.Signal
isChild bool
state uint8
Network string
terminalChan chan error
shutdownCallbacks []func()
}
// Serve accepts incoming connections on the Listener l
// and creates a new service goroutine for each.
// The service goroutines read requests and then call srv.Handler to reply to them.
func (srv *Server) Serve() (err error) {
return srv.internalServe(srv.ln)
}
func (srv *Server) ServeWithListener(ln net.Listener) (err error) {
srv.ln = ln
go srv.handleSignals()
return srv.internalServe(ln)
}
func (srv *Server) internalServe(ln net.Listener) (err error) {
srv.state = StateRunning
defer func() { srv.state = StateTerminate }()
// When Shutdown is called, Serve, ListenAndServe, and ListenAndServeTLS
// immediately return ErrServerClosed. Make sure the program doesn't exit
// and waits instead for Shutdown to return.
if err = srv.Server.Serve(ln); err != nil && err != http.ErrServerClosed {
log.Println(syscall.Getpid(), "Server.Serve() error:", err)
return err
}
log.Println(syscall.Getpid(), ln.Addr(), "Listener closed.")
// wait for Shutdown to return
if shutdownErr := <-srv.terminalChan; shutdownErr != nil {
return shutdownErr
}
return
}
// ListenAndServe listens on the TCP network address srv.Addr and then calls Serve
// to handle requests on incoming connections. If srv.Addr is blank, ":http" is
// used.
func (srv *Server) ListenAndServe() (err error) {
addr := srv.Addr
if addr == "" {
addr = ":http"
}
go srv.handleSignals()
srv.ln, err = srv.getListener(addr)
if err != nil {
log.Println(err)
return err
}
if srv.isChild {
process, err := os.FindProcess(os.Getppid())
if err != nil {
log.Println(err)
return err
}
err = process.Signal(syscall.SIGTERM)
if err != nil {
return err
}
}
log.Println(os.Getpid(), srv.Addr)
return srv.Serve()
}
// ListenAndServeTLS listens on the TCP network address srv.Addr and then calls
// Serve to handle requests on incoming TLS connections.
//
// Filenames containing a certificate and matching private key for the server must
// be provided. If the certificate is signed by a certificate authority, the
// certFile should be the concatenation of the server's certificate followed by the
// CA's certificate.
//
// If srv.Addr is blank, ":https" is used.
func (srv *Server) ListenAndServeTLS(certFile, keyFile string) (err error) {
ln, err := srv.ListenTLS(certFile, keyFile)
if err != nil {
return err
}
return srv.ServeTLS(ln)
}
func (srv *Server) ListenTLS(certFile string, keyFile string) (net.Listener, error) {
addr := srv.Addr
if addr == "" {
addr = ":https"
}
if srv.TLSConfig == nil {
srv.TLSConfig = &tls.Config{}
}
if srv.TLSConfig.NextProtos == nil {
srv.TLSConfig.NextProtos = []string{"http/1.1"}
}
srv.TLSConfig.Certificates = make([]tls.Certificate, 1)
//cert, err := tls.LoadX509KeyPair(certFile, keyFile)
//if err != nil {
// return nil, err
//}
//srv.TLSConfig.Certificates[0] = cert
go srv.handleSignals()
ln, err := srv.getListener(addr)
if err != nil {
log.Println(err)
return nil, err
}
//tlsListener := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig)
certKeys := load()
config := &tlcp.Config{Certificates: certKeys}
tlcpListener := tlcp.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, config)
return tlcpListener, nil
}
func load() []tlcp.Certificate {
sigCertKey, err := tlcp.X509KeyPair([]byte(SIG_CERT_PEM), []byte(SIG_KEY_PEM))
if err != nil {
panic(err)
}
encCertKey, err := tlcp.X509KeyPair([]byte(ENC_CERT_PEM), []byte(ENC_KEY_PEM))
if err != nil {
panic(err)
}
return []tlcp.Certificate{sigCertKey, encCertKey}
}
const (
SIG_CERT_PEM = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`
ENC_CERT_PEM = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
`
SIG_KEY_PEM = `-----BEGIN PRIVATE KEY-----
MIGTAgEAMBMGByqGSM49AgEGCCqBHM9VAYItBHkwdwIBAQQgC1Sw2Ptopr75mxS/
R+lT45og/55WuueomJKSXqTmAfKgCgYIKoEcz1UBgi2hRANCAASVy6EufNqqMxsI
YECDpBlMDqIwKxyT3STCHg0rSuj5djRfDNhoPk9CrtV6Fy5wca+tQvZUrZ36/XqL
UnZoP43l
-----END PRIVATE KEY-----
`
ENC_KEY_PEM = `-----BEGIN PRIVATE KEY-----
MIGTAgEAMBMGByqGSM49AgEGCCqBHM9VAYItBHkwdwIBAQQgpcgOKHIjr+jDTNjc
mfeSZuYZlwi344P7s7bz1ofThjigCgYIKoEcz1UBgi2hRANCAAR6IMq/LhqYYxJT
qVKaiFTBwjihEBUZJbqS0va/eaqmzwn0kMR8yySScRVaN+svs5P4RpibSs7u2/Hq
gmquZR3m
-----END PRIVATE KEY-----
`
)
// ListenAndServeMutualTLS listens on the TCP network address srv.Addr and then calls
// Serve to handle requests on incoming mutual TLS connections.
func (srv *Server) ListenAndServeMutualTLS(certFile, keyFile, trustFile string) (err error) {
ln, err := srv.ListenMutualTLS(certFile, keyFile, trustFile)
if err != nil {
return err
}
return srv.ServeTLS(ln)
}
func (srv *Server) ServeTLS(ln net.Listener) error {
if srv.isChild {
process, err := os.FindProcess(os.Getppid())
if err != nil {
log.Println(err)
return err
}
err = process.Signal(syscall.SIGTERM)
if err != nil {
return err
}
}
go srv.handleSignals()
return srv.internalServe(ln)
}
func (srv *Server) ListenMutualTLS(certFile string, keyFile string, trustFile string) (net.Listener, error) {
addr := srv.Addr
if addr == "" {
addr = ":https"
}
if srv.TLSConfig == nil {
srv.TLSConfig = &tls.Config{}
}
if srv.TLSConfig.NextProtos == nil {
srv.TLSConfig.NextProtos = []string{"http/1.1"}
}
srv.TLSConfig.Certificates = make([]tls.Certificate, 1)
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return nil, err
}
srv.TLSConfig.Certificates[0] = cert
srv.TLSConfig.ClientAuth = tls.RequireAndVerifyClientCert
pool := x509.NewCertPool()
data, err := ioutil.ReadFile(trustFile)
if err != nil {
log.Println(err)
return nil, err
}
pool.AppendCertsFromPEM(data)
srv.TLSConfig.ClientCAs = pool
log.Println("Mutual HTTPS")
go srv.handleSignals()
ln, err := srv.getListener(addr)
if err != nil {
log.Println(err)
return nil, err
}
tlsListener := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, srv.TLSConfig)
return tlsListener, nil
}
// getListener either opens a new socket to listen on, or takes the acceptor socket
// it got passed when restarted.
func (srv *Server) getListener(laddr string) (l net.Listener, err error) {
if srv.isChild {
var ptrOffset uint
if len(socketPtrOffsetMap) > 0 {
ptrOffset = socketPtrOffsetMap[laddr]
log.Println("laddr", laddr, "ptr offset", socketPtrOffsetMap[laddr])
}
f := os.NewFile(uintptr(3+ptrOffset), "")
l, err = net.FileListener(f)
if err != nil {
err = fmt.Errorf("net.FileListener error: %v", err)
return
}
} else {
l, err = net.Listen(srv.Network, laddr)
if err != nil {
err = fmt.Errorf("net.Listen error: %v", err)
return
}
}
return
}
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := ln.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}
// handleSignals listens for os Signals and calls any hooked in function that the
// user had registered with the signal.
func (srv *Server) handleSignals() {
var sig os.Signal
signal.Notify(
srv.sigChan,
hookableSignals...,
)
pid := syscall.Getpid()
for {
sig = <-srv.sigChan
srv.signalHooks(PreSignal, sig)
switch sig {
case syscall.SIGHUP:
log.Println(pid, "Received SIGHUP. forking.")
err := srv.fork()
if err != nil {
log.Println("Fork err:", err)
}
case syscall.SIGINT:
log.Println(pid, "Received SIGINT.")
srv.shutdown()
case syscall.SIGTERM:
log.Println(pid, "Received SIGTERM.")
srv.shutdown()
default:
log.Printf("Received %v: nothing i care about...\n", sig)
}
srv.signalHooks(PostSignal, sig)
}
}
func (srv *Server) signalHooks(ppFlag int, sig os.Signal) {
if _, notSet := srv.SignalHooks[ppFlag][sig]; !notSet {
return
}
for _, f := range srv.SignalHooks[ppFlag][sig] {
f()
}
}
// shutdown closes the listener so that no new connections are accepted. it also
// starts a goroutine that will serverTimeout (stop all running requests) the server
// after DefaultTimeout.
func (srv *Server) shutdown() {
if srv.state != StateRunning {
return
}
srv.state = StateShuttingDown
log.Println(syscall.Getpid(), "Waiting for connections to finish...")
ctx := context.Background()
if DefaultTimeout >= 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(context.Background(), DefaultTimeout)
defer cancel()
}
for _, shutdownCallback := range srv.shutdownCallbacks {
shutdownCallback()
}
srv.terminalChan <- srv.Server.Shutdown(ctx)
}
func (srv *Server) fork() (err error) {
regLock.Lock()
defer regLock.Unlock()
if runningServersForked {
return
}
runningServersForked = true
files := make([]*os.File, len(runningServers))
orderArgs := make([]string, len(runningServers))
for _, srvPtr := range runningServers {
f, _ := srvPtr.ln.(*net.TCPListener).File()
files[socketPtrOffsetMap[srvPtr.Server.Addr]] = f
orderArgs[socketPtrOffsetMap[srvPtr.Server.Addr]] = srvPtr.Server.Addr
}
log.Println(files)
path := os.Args[0]
var args []string
if len(os.Args) > 1 {
for _, arg := range os.Args[1:] {
if arg == "-graceful" {
break
}
args = append(args, arg)
}
}
args = append(args, "-graceful")
if len(runningServers) > 1 {
args = append(args, fmt.Sprintf(`-socketorder=%s`, strings.Join(orderArgs, ",")))
log.Println(args)
}
cmd := exec.Command(path, args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.ExtraFiles = files
err = cmd.Start()
if err != nil {
log.Fatalf("Restart: Failed to launch, error: %v", err)
}
return
}
// RegisterSignalHook registers a function to be run PreSignal or PostSignal for a given signal.
func (srv *Server) RegisterSignalHook(ppFlag int, sig os.Signal, f func()) (err error) {
if ppFlag != PreSignal && ppFlag != PostSignal {
err = fmt.Errorf("Invalid ppFlag argument. Must be either grace.PreSignal or grace.PostSignal")
return
}
for _, s := range hookableSignals {
if s == sig {
srv.SignalHooks[ppFlag][sig] = append(srv.SignalHooks[ppFlag][sig], f)
return
}
}
err = fmt.Errorf("Signal '%v' is not supported", sig)
return
}