Add glide.yaml and vendor deps

vendor/k8s.io/kubernetes/pkg/healthz/healthz.go

@@ -0,0 +1,133 @@
+/*
+Copyright 2014 The Kubernetes 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 healthz
+
+import (
+	"bytes"
+	"fmt"
+	"net/http"
+	"sync"
+)
+
+// HealthzChecker is a named healthz check.
+type HealthzChecker interface {
+	Name() string
+	Check(req *http.Request) error
+}
+
+var defaultHealthz = sync.Once{}
+
+// DefaultHealthz installs the default healthz check to the http.DefaultServeMux.
+func DefaultHealthz(checks ...HealthzChecker) {
+	defaultHealthz.Do(func() {
+		InstallHandler(http.DefaultServeMux, checks...)
+	})
+}
+
+// PingHealthz returns true automatically when checked
+var PingHealthz HealthzChecker = ping{}
+
+// ping implements the simplest possible health checker.
+type ping struct{}
+
+func (ping) Name() string {
+	return "ping"
+}
+
+// PingHealthz is a health check that returns true.
+func (ping) Check(_ *http.Request) error {
+	return nil
+}
+
+// NamedCheck returns a health checker for the given name and function.
+func NamedCheck(name string, check func(r *http.Request) error) HealthzChecker {
+	return &healthzCheck{name, check}
+}
+
+// InstallHandler registers a handler for health checking on the path "/healthz" to mux.
+func InstallHandler(mux mux, checks ...HealthzChecker) {
+	if len(checks) == 0 {
+		checks = []HealthzChecker{PingHealthz}
+	}
+	mux.Handle("/healthz", handleRootHealthz(checks...))
+	for _, check := range checks {
+		mux.Handle(fmt.Sprintf("/healthz/%v", check.Name()), adaptCheckToHandler(check.Check))
+	}
+}
+
+// mux is an interface describing the methods InstallHandler requires.
+type mux interface {
+	Handle(pattern string, handler http.Handler)
+}
+
+// healthzCheck implements HealthzChecker on an arbitrary name and check function.
+type healthzCheck struct {
+	name  string
+	check func(r *http.Request) error
+}
+
+var _ HealthzChecker = &healthzCheck{}
+
+func (c *healthzCheck) Name() string {
+	return c.name
+}
+
+func (c *healthzCheck) Check(r *http.Request) error {
+	return c.check(r)
+}
+
+// handleRootHealthz returns an http.HandlerFunc that serves the provided checks.
+func handleRootHealthz(checks ...HealthzChecker) http.HandlerFunc {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		failed := false
+		var verboseOut bytes.Buffer
+		for _, check := range checks {
+			err := check.Check(r)
+			if err != nil {
+				fmt.Fprintf(&verboseOut, "[-]%v failed: %v\n", check.Name(), err)
+				failed = true
+			} else {
+				fmt.Fprintf(&verboseOut, "[+]%v ok\n", check.Name())
+			}
+		}
+		// always be verbose on failure
+		if failed {
+			http.Error(w, fmt.Sprintf("%vhealthz check failed", verboseOut.String()), http.StatusInternalServerError)
+			return
+		}
+
+		if _, found := r.URL.Query()["verbose"]; !found {
+			fmt.Fprint(w, "ok")
+			return
+		}
+
+		verboseOut.WriteTo(w)
+		fmt.Fprint(w, "healthz check passed\n")
+	})
+}
+
+// adaptCheckToHandler returns an http.HandlerFunc that serves the provided checks.
+func adaptCheckToHandler(c func(r *http.Request) error) http.HandlerFunc {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		err := c(r)
+		if err != nil {
+			http.Error(w, fmt.Sprintf("Internal server error: %v", err), http.StatusInternalServerError)
+		} else {
+			fmt.Fprint(w, "ok")
+		}
+	})
+}