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server.go
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server.go
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package server
import (
"fmt"
"net"
"net/http"
"os"
"sync"
"time"
"code.cloudfoundry.org/garden"
"code.cloudfoundry.org/garden/routes"
"code.cloudfoundry.org/garden/server/bomberman"
"code.cloudfoundry.org/garden/server/streamer"
"code.cloudfoundry.org/lager"
"github.com/tedsuo/rata"
)
type GardenServer struct {
logger lager.Logger
server *http.Server
listenNetwork string
listenAddr string
containerGraceTime time.Duration
backend garden.Backend
listener net.Listener
handling *sync.WaitGroup
started bool
stopping chan bool
bomberman *bomberman.Bomberman
conns map[net.Conn]net.Conn
mu sync.Mutex
streamer *streamer.Streamer
destroys map[string]struct{}
destroysL *sync.Mutex
}
func New(
listenNetwork, listenAddr string,
containerGraceTime time.Duration,
backend garden.Backend,
logger lager.Logger,
) *GardenServer {
s := &GardenServer{
logger: logger.Session("garden-server"),
listenNetwork: listenNetwork,
listenAddr: listenAddr,
containerGraceTime: containerGraceTime,
backend: backend,
stopping: make(chan bool),
handling: new(sync.WaitGroup),
conns: make(map[net.Conn]net.Conn),
streamer: streamer.New(time.Minute),
destroys: make(map[string]struct{}),
destroysL: new(sync.Mutex),
}
handlers := map[string]http.Handler{
routes.Ping: http.HandlerFunc(s.handlePing),
routes.Capacity: http.HandlerFunc(s.handleCapacity),
routes.Create: http.HandlerFunc(s.handleCreate),
routes.Destroy: http.HandlerFunc(s.handleDestroy),
routes.List: http.HandlerFunc(s.handleList),
routes.Stop: http.HandlerFunc(s.handleStop),
routes.StreamIn: http.HandlerFunc(s.handleStreamIn),
routes.StreamOut: http.HandlerFunc(s.handleStreamOut),
routes.CurrentBandwidthLimits: http.HandlerFunc(s.handleCurrentBandwidthLimits),
routes.CurrentCPULimits: http.HandlerFunc(s.handleCurrentCPULimits),
routes.CurrentDiskLimits: http.HandlerFunc(s.handleCurrentDiskLimits),
routes.CurrentMemoryLimits: http.HandlerFunc(s.handleCurrentMemoryLimits),
routes.NetIn: http.HandlerFunc(s.handleNetIn),
routes.NetOut: http.HandlerFunc(s.handleNetOut),
routes.Info: http.HandlerFunc(s.handleInfo),
routes.BulkInfo: http.HandlerFunc(s.handleBulkInfo),
routes.BulkMetrics: http.HandlerFunc(s.handleBulkMetrics),
routes.Run: http.HandlerFunc(s.handleRun),
routes.Stdout: streamer.HandlerFunc(s.streamer.ServeStdout),
routes.Stderr: streamer.HandlerFunc(s.streamer.ServeStderr),
routes.Attach: http.HandlerFunc(s.handleAttach),
routes.Metrics: http.HandlerFunc(s.handleMetrics),
routes.Properties: http.HandlerFunc(s.handleProperties),
routes.Property: http.HandlerFunc(s.handleProperty),
routes.SetProperty: http.HandlerFunc(s.handleSetProperty),
routes.RemoveProperty: http.HandlerFunc(s.handleRemoveProperty),
routes.SetGraceTime: http.HandlerFunc(s.handleSetGraceTime),
}
mux, err := rata.NewRouter(routes.Routes, handlers)
if err != nil {
logger.Fatal("failed-to-initialize-rata", err)
}
conLogger := logger.Session("connection")
s.server = &http.Server{
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
mux.ServeHTTP(w, r)
}),
ConnState: func(conn net.Conn, state http.ConnState) {
switch state {
case http.StateNew:
conLogger.Debug("open", lager.Data{"local_addr": conn.LocalAddr(), "remote_addr": conn.RemoteAddr()})
s.handling.Add(1)
case http.StateActive:
s.mu.Lock()
delete(s.conns, conn)
s.mu.Unlock()
case http.StateIdle:
select {
case <-s.stopping:
conn.Close()
default:
s.mu.Lock()
s.conns[conn] = conn
s.mu.Unlock()
}
case http.StateHijacked, http.StateClosed:
s.mu.Lock()
delete(s.conns, conn)
s.mu.Unlock()
conLogger.Debug("closed", lager.Data{"local_addr": conn.LocalAddr(), "remote_addr": conn.RemoteAddr()})
s.handling.Done()
}
},
}
return s
}
func (s *GardenServer) Start() error {
s.started = true
err := s.removeExistingSocket()
if err != nil {
return err
}
err = s.backend.Start()
if err != nil {
return err
}
listener, err := net.Listen(s.listenNetwork, s.listenAddr)
if err != nil {
return err
}
s.listener = listener
if s.listenNetwork == "unix" {
os.Chmod(s.listenAddr, 0777)
}
containers, err := s.backend.Containers(nil)
if err != nil {
return err
}
s.bomberman = bomberman.New(s.backend, s.reapContainer)
for _, container := range containers {
s.bomberman.Strap(container)
}
go s.server.Serve(listener)
return nil
}
func (s *GardenServer) Stop() {
if !s.started {
return
}
close(s.stopping)
s.listener.Close()
s.mu.Lock()
conns := s.conns
s.conns = make(map[net.Conn]net.Conn)
s.mu.Unlock()
for _, c := range conns {
s.logger.Debug("closing-idle", lager.Data{
"addr": c.RemoteAddr(),
})
c.Close()
}
s.logger.Info("waiting-for-connections-to-close")
s.handling.Wait()
s.logger.Info("stopping-backend")
s.backend.Stop()
s.logger.Info("stopped")
}
func (s *GardenServer) removeExistingSocket() error {
if s.listenNetwork != "unix" {
return nil
}
if _, err := os.Stat(s.listenAddr); os.IsNotExist(err) {
return nil
}
err := os.Remove(s.listenAddr)
if err != nil {
return fmt.Errorf("error deleting existing socket: %s", err)
}
return nil
}
func (s *GardenServer) reapContainer(container garden.Container) {
s.logger.Info("reaping", lager.Data{
"handle": container.Handle(),
"grace-time": s.backend.GraceTime(container).String(),
})
s.destroysL.Lock()
_, alreadyDestroying := s.destroys[container.Handle()]
if !alreadyDestroying {
s.destroys[container.Handle()] = struct{}{}
}
s.destroysL.Unlock()
if alreadyDestroying {
s.logger.Info("skipping reap due to concurrent delete request", lager.Data{
"handle": container.Handle(),
"grace-time": s.backend.GraceTime(container).String(),
})
return
}
s.backend.Destroy(container.Handle())
s.destroysL.Lock()
delete(s.destroys, container.Handle())
s.destroysL.Unlock()
}