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c9f3fd3fc7
This disentangles the following functions, which were previously all mixed together: * 1) Waiting for jobs to terminate when shutting down * 2) Handling signals in the Docker daemon * 3) Per-subsystem cleanup handlers * 4) pidfile management Responsibilities are dispatched as follows: * Signal traps are set in `main`, and trigger `engine.Shutdown` * `engine.Shutdown` coordinates cleanup by waiting for jobs to complete, and calling shutdown handlers * To perform cleanup at shutdown, each subsystem registers handlers with `engine.OnShutdown` * `daemon` is one subsystem, so it registers cleanup via `engine.OnShutdown`. * `daemon` owns the pidfile, which is used to lock access to `/var/lib/docker`. Part of its cleanup is to remove the pidfile. Signed-off-by: Solomon Hykes <solomon@docker.com>
87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
// DEPRECATION NOTICE. PLEASE DO NOT ADD ANYTHING TO THIS FILE.
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//
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// For additional commments see server/server.go
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//
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package server
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import (
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"fmt"
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"github.com/docker/docker/daemon"
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"github.com/docker/docker/daemonconfig"
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"github.com/docker/docker/engine"
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"github.com/docker/docker/utils"
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)
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func (srv *Server) handlerWrap(h engine.Handler) engine.Handler {
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return func(job *engine.Job) engine.Status {
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if !srv.IsRunning() {
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return job.Errorf("Server is not running")
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}
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srv.tasks.Add(1)
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defer srv.tasks.Done()
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return h(job)
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}
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}
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func InitPidfile(job *engine.Job) engine.Status {
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if len(job.Args) == 0 {
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return job.Error(fmt.Errorf("no pidfile provided to initialize"))
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}
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job.Logf("Creating pidfile")
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if err := utils.CreatePidFile(job.Args[0]); err != nil {
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return job.Error(err)
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}
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return engine.StatusOK
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}
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// jobInitApi runs the remote api server `srv` as a daemon,
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// Only one api server can run at the same time - this is enforced by a pidfile.
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// The signals SIGINT, SIGQUIT and SIGTERM are intercepted for cleanup.
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func InitServer(job *engine.Job) engine.Status {
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job.Logf("Creating server")
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cfg := daemonconfig.ConfigFromJob(job)
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srv, err := NewServer(job.Eng, cfg)
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if err != nil {
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return job.Error(err)
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}
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job.Eng.Hack_SetGlobalVar("httpapi.server", srv)
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job.Eng.Hack_SetGlobalVar("httpapi.daemon", srv.daemon)
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for name, handler := range map[string]engine.Handler{
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"build": srv.Build,
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"pull": srv.ImagePull,
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"push": srv.ImagePush,
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} {
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if err := job.Eng.Register(name, srv.handlerWrap(handler)); err != nil {
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return job.Error(err)
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}
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}
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// Install image-related commands from the image subsystem.
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// See `graph/service.go`
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if err := srv.daemon.Repositories().Install(job.Eng); err != nil {
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return job.Error(err)
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}
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// Install daemon-related commands from the daemon subsystem.
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// See `daemon/`
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if err := srv.daemon.Install(job.Eng); err != nil {
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return job.Error(err)
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}
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srv.SetRunning(true)
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return engine.StatusOK
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}
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func NewServer(eng *engine.Engine, config *daemonconfig.Config) (*Server, error) {
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daemon, err := daemon.NewDaemon(config, eng)
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if err != nil {
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return nil, err
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}
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srv := &Server{
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Eng: eng,
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daemon: daemon,
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pullingPool: make(map[string]chan struct{}),
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pushingPool: make(map[string]chan struct{}),
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}
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daemon.SetServer(srv)
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return srv, nil
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}
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