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113 lines
4.0 KiB
Go
113 lines
4.0 KiB
Go
package server
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import (
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"context"
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"net/http"
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"github.com/containerd/log"
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"github.com/docker/docker/api/server/httputils"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/versions"
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"github.com/docker/docker/daemon/server/httpstatus"
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"github.com/docker/docker/daemon/server/middleware"
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"github.com/docker/docker/daemon/server/router"
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"github.com/docker/docker/dockerversion"
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"github.com/docker/docker/internal/otelutil"
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"github.com/gorilla/mux"
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"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
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"go.opentelemetry.io/otel/baggage"
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)
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// versionMatcher defines a variable matcher to be parsed by the router
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// when a request is about to be served.
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const versionMatcher = "/v{version:[0-9.]+}"
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// Server contains instance details for the server
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type Server struct {
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middlewares []middleware.Middleware
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}
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// UseMiddleware appends a new middleware to the request chain.
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// This needs to be called before the API routes are configured.
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func (s *Server) UseMiddleware(m middleware.Middleware) {
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s.middlewares = append(s.middlewares, m)
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}
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func (s *Server) makeHTTPHandler(handler httputils.APIFunc, operation string) http.HandlerFunc {
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return otelhttp.NewHandler(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Define the context that we'll pass around to share info
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// like the docker-request-id.
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//
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// The 'context' will be used for global data that should
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// apply to all requests. Data that is specific to the
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// immediate function being called should still be passed
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// as 'args' on the function call.
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// use intermediate variable to prevent "should not use basic type
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// string as key in context.WithValue" golint errors
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ua := r.Header.Get("User-Agent")
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ctx := baggage.ContextWithBaggage(context.WithValue(r.Context(), dockerversion.UAStringKey{}, ua), otelutil.MustNewBaggage(
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otelutil.MustNewMemberRaw(otelutil.TriggerKey, "api"),
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))
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r = r.WithContext(ctx)
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handlerFunc := s.handlerWithGlobalMiddlewares(handler)
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vars := mux.Vars(r)
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if vars == nil {
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vars = make(map[string]string)
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}
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if err := handlerFunc(ctx, w, r, vars); err != nil {
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statusCode := httpstatus.FromError(err)
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if statusCode >= http.StatusInternalServerError {
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log.G(ctx).Errorf("Handler for %s %s returned error: %v", r.Method, r.URL.Path, err)
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}
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// While we no longer support API versions older 1.24 [api.MinSupportedAPIVersion],
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// a client may try to connect using an older version and expect a plain-text error
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// instead of a JSON error. This would result in an "API version too old" error
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// formatted in JSON being printed as-is.
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//
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// Let's be nice, and return errors in plain-text to provide a more readable error
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// to help the user understand the API version they're using is no longer supported.
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if v := vars["version"]; v != "" && versions.LessThan(v, "1.24") {
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http.Error(w, err.Error(), statusCode)
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} else {
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_ = httputils.WriteJSON(w, statusCode, &types.ErrorResponse{
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Message: err.Error(),
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})
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}
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}
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}), operation).ServeHTTP
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}
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// CreateMux returns a new mux with all the routers registered.
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func (s *Server) CreateMux(ctx context.Context, routers ...router.Router) *mux.Router {
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log.G(ctx).Debug("Registering routers")
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m := mux.NewRouter()
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for _, apiRouter := range routers {
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for _, r := range apiRouter.Routes() {
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if ctx.Err() != nil {
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return m
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}
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log.G(ctx).WithFields(log.Fields{"method": r.Method(), "path": r.Path()}).Debug("Registering route")
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f := s.makeHTTPHandler(r.Handler(), r.Method()+" "+r.Path())
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m.Path(versionMatcher + r.Path()).Methods(r.Method()).Handler(f)
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m.Path(r.Path()).Methods(r.Method()).Handler(f)
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}
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}
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// Setup handlers for undefined paths and methods
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notFoundHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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_ = httputils.WriteJSON(w, http.StatusNotFound, &types.ErrorResponse{
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Message: "page not found",
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})
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})
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m.HandleFunc(versionMatcher+"/{path:.*}", notFoundHandler)
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m.NotFoundHandler = notFoundHandler
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m.MethodNotAllowedHandler = notFoundHandler
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return m
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}
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