forked from influxdata/kapacitor
/
service.go
284 lines (245 loc) · 5.85 KB
/
service.go
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package httpd
import (
"crypto/tls"
"expvar"
"fmt"
"log"
"net"
"net/http"
"net/url"
"strings"
"sync"
"time"
"github.com/influxdata/kapacitor/services/logging"
)
type Service struct {
ln net.Listener
addr string
https bool
cert string
err chan error
externalURL string
server *http.Server
mu sync.Mutex
wg sync.WaitGroup
new chan net.Conn
active chan net.Conn
idle chan net.Conn
closed chan net.Conn
stop chan chan struct{}
shutdownTimeout time.Duration
Handler *Handler
logger *log.Logger
}
func NewService(c Config, hostname string, l *log.Logger, li logging.Interface) *Service {
statMap := &expvar.Map{}
statMap.Init()
port, _ := c.Port()
u := url.URL{
Host: fmt.Sprintf("%s:%d", hostname, port),
Scheme: "http",
}
if c.HttpsEnabled {
u.Scheme = "https"
}
s := &Service{
addr: c.BindAddress,
https: c.HttpsEnabled,
cert: c.HttpsCertificate,
externalURL: u.String(),
err: make(chan error, 1),
shutdownTimeout: time.Duration(c.ShutdownTimeout),
Handler: NewHandler(
c.AuthEnabled,
c.LogEnabled,
c.WriteTracing,
c.GZIP,
statMap,
l,
li,
c.SharedSecret,
),
logger: l,
}
return s
}
// Open starts the service
func (s *Service) Open() error {
s.mu.Lock()
defer s.mu.Unlock()
s.logger.Println("I! Starting HTTP service")
s.logger.Println("I! Authentication enabled:", s.Handler.requireAuthentication)
// Open listener.
if s.https {
cert, err := tls.LoadX509KeyPair(s.cert, s.cert)
if err != nil {
return err
}
listener, err := tls.Listen("tcp", s.addr, &tls.Config{
Certificates: []tls.Certificate{cert},
})
if err != nil {
return err
}
s.logger.Println("I! Listening on HTTPS:", listener.Addr().String())
s.ln = listener
} else {
listener, err := net.Listen("tcp", s.addr)
if err != nil {
return err
}
s.logger.Println("I! Listening on HTTP:", listener.Addr().String())
s.ln = listener
}
// Define server
s.server = &http.Server{
Handler: s.Handler,
ConnState: s.connStateHandler,
}
s.new = make(chan net.Conn)
s.active = make(chan net.Conn)
s.idle = make(chan net.Conn)
s.closed = make(chan net.Conn)
s.stop = make(chan chan struct{})
// Begin listening for requests in a separate goroutine.
go s.manage()
s.wg.Add(1)
go s.serve()
return nil
}
// Close closes the underlying listener.
func (s *Service) Close() error {
defer s.logger.Println("I! Closed HTTP service")
s.mu.Lock()
defer s.mu.Unlock()
// If server is not set we were never started
if s.server == nil {
return nil
}
// First turn off KeepAlives so that new connections will not become idle
s.server.SetKeepAlivesEnabled(false)
// Signal to manage loop we are stopping
stopping := make(chan struct{})
s.stop <- stopping
// Next close the listener so no new connections can be made
err := s.ln.Close()
if err != nil {
return err
}
<-stopping
s.wg.Wait()
s.server = nil
return nil
}
func (s *Service) Err() <-chan error {
return s.err
}
func (s *Service) connStateHandler(c net.Conn, state http.ConnState) {
switch state {
case http.StateNew:
s.new <- c
case http.StateActive:
s.active <- c
case http.StateIdle:
s.idle <- c
case http.StateHijacked, http.StateClosed:
s.closed <- c
}
}
// Watch connection state and handle stop request.
func (s *Service) manage() {
defer func() {
close(s.new)
close(s.active)
close(s.idle)
close(s.closed)
}()
var stopDone chan struct{}
conns := map[net.Conn]http.ConnState{}
var timeout <-chan time.Time
for {
select {
case c := <-s.new:
conns[c] = http.StateNew
case c := <-s.active:
conns[c] = http.StateActive
case c := <-s.idle:
conns[c] = http.StateIdle
// if we're already stopping, close it
if stopDone != nil {
c.Close()
}
case c := <-s.closed:
delete(conns, c)
// if we're waiting to stop and are all empty, we just closed the last
// connection and we're done.
if stopDone != nil && len(conns) == 0 {
close(stopDone)
return
}
case stopDone = <-s.stop:
// if we're already all empty, we're already done
if len(conns) == 0 {
close(stopDone)
return
}
// close current idle connections right away
for c, cs := range conns {
if cs == http.StateIdle {
c.Close()
}
}
timeout = time.After(s.shutdownTimeout)
// continue the loop and wait for all the ConnState updates which will
// eventually close(stopDone) and return from this goroutine.
case <-timeout:
s.logger.Println("E! shutdown timedout, forcefully closing all remaining connections")
// Connections didn't close in time.
// Forcefully close all connections.
for c := range conns {
c.Close()
}
}
}
}
// serve serves the handler from the listener.
func (s *Service) serve() {
defer s.wg.Done()
err := s.server.Serve(s.ln)
// The listener was closed so exit
// See https://github.com/golang/go/issues/4373
if !strings.Contains(err.Error(), "closed") {
s.err <- fmt.Errorf("listener failed: addr=%s, err=%s", s.Addr(), err)
} else {
s.err <- nil
}
}
func (s *Service) Addr() net.Addr {
if s.ln != nil {
return s.ln.Addr()
}
return nil
}
func (s *Service) URL() string {
if s.ln != nil {
if s.https {
return "https://" + s.Addr().String() + BasePath
}
return "http://" + s.Addr().String() + BasePath
}
return ""
}
// URL that should resolve externally to the server HTTP endpoint.
// It is possible that the URL does not resolve correctly if the hostname config setting is incorrect.
func (s *Service) ExternalURL() string {
return s.externalURL
}
func (s *Service) AddRoutes(routes []Route) error {
return s.Handler.AddRoutes(routes)
}
func (s *Service) AddPreviewRoutes(routes []Route) error {
return s.Handler.AddPreviewRoutes(routes)
}
func (s *Service) DelRoutes(routes []Route) {
s.Handler.DelRoutes(routes)
}