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server.go
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server.go
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// Copyright © 2017 The virtual-kubelet authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"net/http"
"github.com/gorilla/mux"
"github.com/virtual-kubelet/virtual-kubelet/log"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/plugin/ochttp/propagation/b3"
)
// ServeMux defines an interface used to attach routes to an existing http
// serve mux.
// It is used to enable callers creating a new server to completely manage
// their own HTTP server while allowing us to attach the required routes to
// satisfy the Kubelet HTTP interfaces.
type ServeMux interface {
Handle(path string, h http.Handler)
}
type PodHandlerConfig struct {
RunInContainer ContainerExecHandlerFunc
GetContainerLogs ContainerLogsHandlerFunc
GetPods PodListerFunc
}
// PodHandler creates an http handler for interacting with pods/containers.
func PodHandler(p PodHandlerConfig, debug bool) http.Handler {
r := mux.NewRouter()
// This matches the behaviour in the reference kubelet
r.StrictSlash(true)
if debug {
r.HandleFunc("/runningpods/", HandleRunningPods(p.GetPods)).Methods("GET")
}
r.HandleFunc("/containerLogs/{namespace}/{pod}/{container}", HandleContainerLogs(p.GetContainerLogs)).Methods("GET")
r.HandleFunc("/exec/{namespace}/{pod}/{container}", HandleContainerExec(p.RunInContainer)).Methods("POST")
r.NotFoundHandler = http.HandlerFunc(NotFound)
return r
}
// PodStatsSummaryHandler creates an http handler for serving pod metrics.
//
// If the passed in handler func is nil this will create handlers which only
// serves http.StatusNotImplemented
func PodStatsSummaryHandler(f PodStatsSummaryHandlerFunc) http.Handler {
if f == nil {
return http.HandlerFunc(NotImplemented)
}
r := mux.NewRouter()
const summaryRoute = "/stats/summary"
h := HandlePodStatsSummary(f)
r.Handle(summaryRoute, ochttp.WithRouteTag(h, "PodStatsSummaryHandler")).Methods("GET")
r.Handle(summaryRoute+"/", ochttp.WithRouteTag(h, "PodStatsSummaryHandler")).Methods("GET")
r.NotFoundHandler = http.HandlerFunc(NotFound)
return r
}
// AttachPodRoutes adds the http routes for pod stuff to the passed in serve mux.
//
// Callers should take care to namespace the serve mux as they see fit, however
// these routes get called by the Kubernetes API server.
func AttachPodRoutes(p PodHandlerConfig, mux ServeMux, debug bool) {
mux.Handle("/", InstrumentHandler(PodHandler(p, debug)))
}
// PodMetricsConfig stores the handlers for pod metrics routes
// It is used by AttachPodMetrics.
//
// The main reason for this struct is in case of expansion we do not need to break
// the package level API.
type PodMetricsConfig struct {
GetStatsSummary PodStatsSummaryHandlerFunc
}
// AttachPodMetricsRoutes adds the http routes for pod/node metrics to the passed in serve mux.
//
// Callers should take care to namespace the serve mux as they see fit, however
// these routes get called by the Kubernetes API server.
func AttachPodMetricsRoutes(p PodMetricsConfig, mux ServeMux) {
mux.Handle("/", InstrumentHandler(HandlePodStatsSummary(p.GetStatsSummary)))
}
func instrumentRequest(r *http.Request) *http.Request {
ctx := r.Context()
logger := log.G(ctx).WithFields(log.Fields{
"uri": r.RequestURI,
"vars": mux.Vars(r),
})
ctx = log.WithLogger(ctx, logger)
return r.WithContext(ctx)
}
// InstrumentHandler wraps an http.Handler and injects instrumentation into the request context.
func InstrumentHandler(h http.Handler) http.Handler {
instrumented := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
req = instrumentRequest(req)
h.ServeHTTP(w, req)
})
return &ochttp.Handler{
Handler: instrumented,
Propagation: &b3.HTTPFormat{},
}
}
// NotFound provides a handler for cases where the requested endpoint doesn't exist
func NotFound(w http.ResponseWriter, r *http.Request) {
log.G(r.Context()).Debug("404 request not found")
http.Error(w, "404 request not found", http.StatusNotFound)
}
// NotImplemented provides a handler for cases where a provider does not implement a given API
func NotImplemented(w http.ResponseWriter, r *http.Request) {
log.G(r.Context()).Debug("501 not implemented")
http.Error(w, "501 not implemented", http.StatusNotImplemented)
}