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package server // import "github.com/docker/docker/api/server"
import (
"context"
"net/http"
"github.com/containerd/log"
"github.com/docker/docker/api/server/httpstatus"
"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/api/server/router/debug"
"github.com/docker/docker/api/types"
"github.com/docker/docker/dockerversion"
"github.com/gorilla/mux"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
)
// 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.]+}"
// Server contains instance details for the server
type Server struct {
middlewares []middleware.Middleware
}
// 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)
}
func (s *Server) makeHTTPHandler(handler httputils.APIFunc, operation string) http.HandlerFunc {
return otelhttp.NewHandler(http.HandlerFunc(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.
// use intermediate variable to prevent "should not use basic type
// string as key in context.WithValue" golint errors
ctx := context.WithValue(r.Context(), dockerversion.UAStringKey{}, r.Header.Get("User-Agent"))
r = r.WithContext(ctx)
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 := httpstatus.FromError(err)
if statusCode >= 500 {
log.G(ctx).Errorf("Handler for %s %s returned error: %v", r.Method, r.URL.Path, err)
}
_ = httputils.WriteJSON(w, statusCode, &types.ErrorResponse{
Message: err.Error(),
})
}
}), operation).ServeHTTP
}
// CreateMux returns a new mux with all the routers registered.
func (s *Server) CreateMux(routers ...router.Router) *mux.Router {
m := mux.NewRouter()
log.G(context.TODO()).Debug("Registering routers")
for _, apiRouter := range routers {
for _, r := range apiRouter.Routes() {
f := s.makeHTTPHandler(r.Handler(), r.Method()+" "+r.Path())
log.G(context.TODO()).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)
}
}
debugRouter := debug.NewRouter()
for _, r := range debugRouter.Routes() {
f := s.makeHTTPHandler(r.Handler(), r.Method()+" "+r.Path())
m.Path("/debug" + r.Path()).Handler(f)
}
notFoundHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_ = httputils.WriteJSON(w, http.StatusNotFound, &types.ErrorResponse{
Message: "page not found",
})
})
m.HandleFunc(versionMatcher+"/{path:.*}", notFoundHandler)
m.NotFoundHandler = notFoundHandler
m.MethodNotAllowedHandler = notFoundHandler
return m
}
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