mirror of https://github.com/docker/docs.git
124 lines
3.1 KiB
Go
124 lines
3.1 KiB
Go
package api
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import (
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"crypto/tls"
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"fmt"
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"net"
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"net/http"
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"strings"
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log "github.com/Sirupsen/logrus"
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)
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// DefaultDockerPort is the default port to listen on for incoming connections.
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const DefaultDockerPort = ":2375"
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// Dispatcher is a meta http.Handler. It acts as an http.Handler and forwards
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// requests to another http.Handler that can be changed at runtime.
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type dispatcher struct {
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handler http.Handler
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}
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// SetHandler changes the underlying handler.
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func (d *dispatcher) SetHandler(handler http.Handler) {
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d.handler = handler
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}
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// ServeHTTP forwards requests to the underlying handler.
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func (d *dispatcher) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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if d.handler == nil {
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httpError(w, "No dispatcher defined", http.StatusInternalServerError)
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}
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d.handler.ServeHTTP(w, r)
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}
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// Server is a Docker API server.
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type Server struct {
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hosts []string
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tlsConfig *tls.Config
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dispatcher *dispatcher
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}
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// NewServer creates an api.Server.
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func NewServer(hosts []string, tlsConfig *tls.Config) *Server {
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return &Server{
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hosts: hosts,
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tlsConfig: tlsConfig,
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dispatcher: &dispatcher{},
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}
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}
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// SetHandler is used to overwrite the HTTP handler for the API.
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// This can be the api router or a reverse proxy.
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func (s *Server) SetHandler(handler http.Handler) {
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s.dispatcher.SetHandler(handler)
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}
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func newListener(proto, addr string, tlsConfig *tls.Config) (net.Listener, error) {
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l, err := net.Listen(proto, addr)
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if err != nil {
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if strings.Contains(err.Error(), "address already in use") && strings.Contains(addr, DefaultDockerPort) {
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return nil, fmt.Errorf("%s: is Docker already running on this machine? Try using a different port", err)
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}
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return nil, err
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}
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if tlsConfig != nil {
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tlsConfig.NextProtos = []string{"http/1.1"}
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l = tls.NewListener(l, tlsConfig)
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}
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return l, nil
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}
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// ListenAndServe starts an HTTP server on each host to listen on its
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// TCP or Unix network address and calls Serve on each host's server
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// to handle requests on incoming connections.
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//
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// The expected format for a host string is [protocol://]address. The protocol
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// must be either "tcp" or "unix", with "tcp" used by default if not specified.
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func (s *Server) ListenAndServe() error {
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chErrors := make(chan error, len(s.hosts))
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for _, host := range s.hosts {
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protoAddrParts := strings.SplitN(host, "://", 2)
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if len(protoAddrParts) == 1 {
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protoAddrParts = append([]string{"tcp"}, protoAddrParts...)
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}
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go func() {
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log.WithFields(log.Fields{"proto": protoAddrParts[0], "addr": protoAddrParts[1]}).Info("Listening for HTTP")
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var (
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l net.Listener
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err error
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server = &http.Server{
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Addr: protoAddrParts[1],
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Handler: s.dispatcher,
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}
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)
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switch protoAddrParts[0] {
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case "unix":
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l, err = newUnixListener(protoAddrParts[1], s.tlsConfig)
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case "tcp":
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l, err = newListener("tcp", protoAddrParts[1], s.tlsConfig)
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default:
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err = fmt.Errorf("unsupported protocol: %q", protoAddrParts[0])
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}
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if err != nil {
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chErrors <- err
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} else {
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chErrors <- server.Serve(l)
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}
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}()
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}
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for i := 0; i < len(s.hosts); i++ {
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err := <-chErrors
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if err != nil {
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return err
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}
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}
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return nil
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}
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