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moby--moby/api/server/server.go
Tibor Vass f7d9bb6248 Show stacktrace in daemon logs only if 500 internal error
Signed-off-by: Tibor Vass <tibor@docker.com>
2017-02-06 10:13:21 -08:00

211 lines
5.8 KiB
Go

package server
import (
"crypto/tls"
"fmt"
"net"
"net/http"
"strings"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/errors"
"github.com/docker/docker/api/server/httputils"
"github.com/docker/docker/api/server/middleware"
"github.com/docker/docker/api/server/router"
"github.com/docker/docker/dockerversion"
"github.com/gorilla/mux"
"golang.org/x/net/context"
)
// versionMatcher defines a variable matcher to be parsed by the router
// when a request is about to be served.
const versionMatcher = "/v{version:[0-9.]+}"
// Config provides the configuration for the API server
type Config struct {
Logging bool
EnableCors bool
CorsHeaders string
Version string
SocketGroup string
TLSConfig *tls.Config
}
// Server contains instance details for the server
type Server struct {
cfg *Config
servers []*HTTPServer
routers []router.Router
routerSwapper *routerSwapper
middlewares []middleware.Middleware
}
// New returns a new instance of the server based on the specified configuration.
// It allocates resources which will be needed for ServeAPI(ports, unix-sockets).
func New(cfg *Config) *Server {
return &Server{
cfg: cfg,
}
}
// UseMiddleware appends a new middleware to the request chain.
// This needs to be called before the API routes are configured.
func (s *Server) UseMiddleware(m middleware.Middleware) {
s.middlewares = append(s.middlewares, m)
}
// Accept sets a listener the server accepts connections into.
func (s *Server) Accept(addr string, listeners ...net.Listener) {
for _, listener := range listeners {
httpServer := &HTTPServer{
srv: &http.Server{
Addr: addr,
},
l: listener,
}
s.servers = append(s.servers, httpServer)
}
}
// Close closes servers and thus stop receiving requests
func (s *Server) Close() {
for _, srv := range s.servers {
if err := srv.Close(); err != nil {
logrus.Error(err)
}
}
}
// serveAPI loops through all initialized servers and spawns goroutine
// with Serve method for each. It sets createMux() as Handler also.
func (s *Server) serveAPI() error {
var chErrors = make(chan error, len(s.servers))
for _, srv := range s.servers {
srv.srv.Handler = s.routerSwapper
go func(srv *HTTPServer) {
var err error
logrus.Infof("API listen on %s", srv.l.Addr())
if err = srv.Serve(); err != nil && strings.Contains(err.Error(), "use of closed network connection") {
err = nil
}
chErrors <- err
}(srv)
}
for i := 0; i < len(s.servers); i++ {
err := <-chErrors
if err != nil {
return err
}
}
return nil
}
// HTTPServer contains an instance of http server and the listener.
// srv *http.Server, contains configuration to create an http server and a mux router with all api end points.
// l net.Listener, is a TCP or Socket listener that dispatches incoming request to the router.
type HTTPServer struct {
srv *http.Server
l net.Listener
}
// Serve starts listening for inbound requests.
func (s *HTTPServer) Serve() error {
return s.srv.Serve(s.l)
}
// Close closes the HTTPServer from listening for the inbound requests.
func (s *HTTPServer) Close() error {
return s.l.Close()
}
func (s *Server) makeHTTPHandler(handler httputils.APIFunc) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// Define the context that we'll pass around to share info
// like the docker-request-id.
//
// The 'context' will be used for global data that should
// apply to all requests. Data that is specific to the
// immediate function being called should still be passed
// as 'args' on the function call.
ctx := context.WithValue(context.Background(), dockerversion.UAStringKey, r.Header.Get("User-Agent"))
handlerFunc := s.handlerWithGlobalMiddlewares(handler)
vars := mux.Vars(r)
if vars == nil {
vars = make(map[string]string)
}
if err := handlerFunc(ctx, w, r, vars); err != nil {
statusCode := httputils.GetHTTPErrorStatusCode(err)
errFormat := "%v"
if statusCode == http.StatusInternalServerError {
errFormat = "%+v"
}
logrus.Errorf("Handler for %s %s returned error: "+errFormat, r.Method, r.URL.Path, err)
httputils.MakeErrorHandler(err)(w, r)
}
}
}
// InitRouter initializes the list of routers for the server.
// This method also enables the Go profiler if enableProfiler is true.
func (s *Server) InitRouter(enableProfiler bool, routers ...router.Router) {
s.routers = append(s.routers, routers...)
m := s.createMux()
if enableProfiler {
profilerSetup(m)
}
s.routerSwapper = &routerSwapper{
router: m,
}
}
// createMux initializes the main router the server uses.
func (s *Server) createMux() *mux.Router {
m := mux.NewRouter()
logrus.Debug("Registering routers")
for _, apiRouter := range s.routers {
for _, r := range apiRouter.Routes() {
f := s.makeHTTPHandler(r.Handler())
logrus.Debugf("Registering %s, %s", r.Method(), r.Path())
m.Path(versionMatcher + r.Path()).Methods(r.Method()).Handler(f)
m.Path(r.Path()).Methods(r.Method()).Handler(f)
}
}
err := errors.NewRequestNotFoundError(fmt.Errorf("page not found"))
notFoundHandler := httputils.MakeErrorHandler(err)
m.HandleFunc(versionMatcher+"/{path:.*}", notFoundHandler)
m.NotFoundHandler = notFoundHandler
return m
}
// Wait blocks the server goroutine until it exits.
// It sends an error message if there is any error during
// the API execution.
func (s *Server) Wait(waitChan chan error) {
if err := s.serveAPI(); err != nil {
logrus.Errorf("ServeAPI error: %v", err)
waitChan <- err
return
}
waitChan <- nil
}
// DisableProfiler reloads the server mux without adding the profiler routes.
func (s *Server) DisableProfiler() {
s.routerSwapper.Swap(s.createMux())
}
// EnableProfiler reloads the server mux adding the profiler routes.
func (s *Server) EnableProfiler() {
m := s.createMux()
profilerSetup(m)
s.routerSwapper.Swap(m)
}