141 lines
3.6 KiB
Go
141 lines
3.6 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Handler for /api/
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package api
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import (
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"encoding/json"
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"fmt"
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"io"
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"log"
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"net/http"
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"path"
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"strings"
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"time"
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"github.com/google/cadvisor/info"
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"github.com/google/cadvisor/manager"
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)
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const (
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apiResource = "/api/"
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containersApi = "containers"
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subcontainersApi = "subcontainers"
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machineApi = "machine"
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)
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var supportedApiVersions map[string]struct{} = map[string]struct{}{
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"v1.0": struct{}{},
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}
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func RegisterHandlers(m manager.Manager) error {
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http.HandleFunc(apiResource, func(w http.ResponseWriter, r *http.Request) {
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err := handleRequest(m, w, r)
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if err != nil {
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fmt.Fprintf(w, "%s", err)
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}
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})
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return nil
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}
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func handleRequest(m manager.Manager, w http.ResponseWriter, r *http.Request) error {
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start := time.Now()
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request := r.URL.Path
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requestElements := strings.Split(r.URL.Path, "/")
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// Verify that we have all the elements we expect:
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// <empty>/api/<version>/<request type>[/<args...>]
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// [0] [1] [2] [3] [4...]
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if len(requestElements) < 4 {
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return fmt.Errorf("incomplete API request %q", request)
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}
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// Get all the element parts.
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emptyElement := requestElements[0]
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apiElement := requestElements[1]
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version := requestElements[2]
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requestType := requestElements[3]
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requestArgs := []string{}
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if len(requestElements) > 4 {
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requestArgs = requestElements[4:]
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}
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// Check elements.
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if len(emptyElement) != 0 {
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return fmt.Errorf("unexpected API request format %q", request)
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}
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if apiElement != "api" {
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return fmt.Errorf("invalid API request format %q", request)
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}
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if _, ok := supportedApiVersions[version]; !ok {
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return fmt.Errorf("unsupported API version %q", version)
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}
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switch {
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case requestType == machineApi:
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log.Printf("Api - Machine")
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// Get the MachineInfo
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machineInfo, err := m.GetMachineInfo()
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if err != nil {
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return err
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}
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out, err := json.Marshal(machineInfo)
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if err != nil {
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fmt.Fprintf(w, "Failed to marshall MachineInfo with error: %s", err)
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}
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w.Write(out)
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case requestType == containersApi:
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// The container name is the path after the requestType.
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containerName := path.Join("/", strings.Join(requestArgs, "/"))
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log.Printf("Api - Container(%s)", containerName)
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var query info.ContainerInfoRequest
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// If a user does not specify number of stats/samples he wants,
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// it's 64 by default
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query.NumStats = 64
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query.NumSamples = 64
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decoder := json.NewDecoder(r.Body)
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err := decoder.Decode(&query)
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if err != nil && err != io.EOF {
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return fmt.Errorf("unable to decode the json value: ", err)
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}
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// Get the container.
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cont, err := m.GetContainerInfo(containerName, &query)
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if err != nil {
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fmt.Fprintf(w, "Failed to get container \"%s\" with error: %s", containerName, err)
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return err
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}
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// Only output the container as JSON.
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out, err := json.Marshal(cont)
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if err != nil {
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fmt.Fprintf(w, "Failed to marshall container %q with error: %s", containerName, err)
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}
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w.Write(out)
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default:
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return fmt.Errorf("unknown API request type %q", requestType)
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}
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log.Printf("Request took %s", time.Since(start))
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return nil
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}
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