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handlers.go
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/
handlers.go
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/*
Copyright 2014 Google Inc. All rights reserved.
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 kubelet
import (
"fmt"
"net"
"strconv"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
kubecontainer "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/dockertools"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
"github.com/golang/glog"
)
type handlerRunner struct {
httpGetter httpGetter
commandRunner dockertools.ContainerCommandRunner
containerManager *dockertools.DockerManager
}
// TODO(yifan): Merge commandRunner and containerManager once containerManager implements the ContainerCommandRunner interface.
func newHandlerRunner(httpGetter httpGetter, commandRunner dockertools.ContainerCommandRunner, containerManager *dockertools.DockerManager) kubecontainer.HandlerRunner {
return &handlerRunner{
httpGetter: httpGetter,
commandRunner: commandRunner,
containerManager: containerManager,
}
}
// TODO(yifan): Use a strong type for containerID.
func (hr *handlerRunner) Run(containerID string, pod *api.Pod, container *api.Container, handler *api.Handler) error {
switch {
case handler.Exec != nil:
_, err := hr.commandRunner.RunInContainer(containerID, handler.Exec.Command)
return err
case handler.HTTPGet != nil:
return hr.runHTTPHandler(pod, container, handler)
default:
err := fmt.Errorf("Invalid handler: %v", handler)
glog.Errorf("Cannot run handler: %v", err)
return err
}
}
// resolvePort attempts to turn a IntOrString port reference into a concrete port number.
// If portReference has an int value, it is treated as a literal, and simply returns that value.
// If portReference is a string, an attempt is first made to parse it as an integer. If that fails,
// an attempt is made to find a port with the same name in the container spec.
// If a port with the same name is found, it's ContainerPort value is returned. If no matching
// port is found, an error is returned.
func resolvePort(portReference util.IntOrString, container *api.Container) (int, error) {
if portReference.Kind == util.IntstrInt {
return portReference.IntVal, nil
} else {
portName := portReference.StrVal
port, err := strconv.Atoi(portName)
if err == nil {
return port, nil
}
for _, portSpec := range container.Ports {
if portSpec.Name == portName {
return portSpec.ContainerPort, nil
}
}
}
return -1, fmt.Errorf("couldn't find port: %v in %v", portReference, container)
}
func (hr *handlerRunner) runHTTPHandler(pod *api.Pod, container *api.Container, handler *api.Handler) error {
host := handler.HTTPGet.Host
if len(host) == 0 {
status, err := hr.containerManager.GetPodStatus(pod)
if err != nil {
glog.Errorf("Unable to get pod info, event handlers may be invalid.")
return err
}
if status.PodIP == "" {
return fmt.Errorf("failed to find networking container: %v", status)
}
host = status.PodIP
}
var port int
if handler.HTTPGet.Port.Kind == util.IntstrString && len(handler.HTTPGet.Port.StrVal) == 0 {
port = 80
} else {
var err error
port, err = resolvePort(handler.HTTPGet.Port, container)
if err != nil {
return err
}
}
url := fmt.Sprintf("http://%s/%s", net.JoinHostPort(host, strconv.Itoa(port)), handler.HTTPGet.Path)
_, err := hr.httpGetter.Get(url)
return err
}