140 lines
3.8 KiB
Go
140 lines
3.8 KiB
Go
// Copyright 2015 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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// Client library to programmatically access cAdvisor API.
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package v2
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"path"
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"strings"
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v1 "github.com/google/cadvisor/info/v1"
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info "github.com/google/cadvisor/info/v2"
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)
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// Client represents the base URL for a cAdvisor client.
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type Client struct {
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baseUrl string
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}
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// NewClient returns a new client with the specified base URL.
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func NewClient(url string) (*Client, error) {
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if !strings.HasSuffix(url, "/") {
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url += "/"
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}
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return &Client{
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baseUrl: fmt.Sprintf("%sapi/v2.0/", url),
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}, nil
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}
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// MachineInfo returns the JSON machine information for this client.
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// A non-nil error result indicates a problem with obtaining
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// the JSON machine information data.
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func (self *Client) MachineInfo() (minfo *v1.MachineInfo, err error) {
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u := self.machineInfoUrl()
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ret := new(v1.MachineInfo)
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if err = self.httpGetJsonData(ret, nil, u, "machine info"); err != nil {
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return
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}
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minfo = ret
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return
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}
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// VersionInfo returns the version info for cAdvisor.
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func (self *Client) VersionInfo() (version string, err error) {
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u := self.versionInfoUrl()
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version, err = self.httpGetString(u, "version info")
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return
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}
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// Attributes returns hardware and software attributes of the machine.
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func (self *Client) Attributes() (attr *info.Attributes, err error) {
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u := self.attributesUrl()
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ret := new(info.Attributes)
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if err = self.httpGetJsonData(ret, nil, u, "attributes"); err != nil {
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return
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}
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attr = ret
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return
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}
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func (self *Client) machineInfoUrl() string {
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return self.baseUrl + path.Join("machine")
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}
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func (self *Client) versionInfoUrl() string {
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return self.baseUrl + path.Join("version")
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}
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func (self *Client) attributesUrl() string {
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return self.baseUrl + path.Join("attributes")
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}
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func (self *Client) httpGetResponse(postData interface{}, url, infoName string) ([]byte, error) {
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var resp *http.Response
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var err error
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if postData != nil {
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data, err := json.Marshal(postData)
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if err != nil {
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return nil, fmt.Errorf("unable to marshal data: %v", err)
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}
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resp, err = http.Post(url, "application/json", bytes.NewBuffer(data))
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} else {
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resp, err = http.Get(url)
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}
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if err != nil {
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return nil, fmt.Errorf("unable to get %q from %q: %v", infoName, url, err)
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}
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if resp == nil {
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return nil, fmt.Errorf("received empty response for %q from %q", infoName, url)
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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err = fmt.Errorf("unable to read all %q from %q: %v", infoName, url, err)
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return nil, err
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}
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if resp.StatusCode != 200 {
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return nil, fmt.Errorf("request %q failed with error: %q", url, strings.TrimSpace(string(body)))
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}
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return body, nil
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}
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func (self *Client) httpGetString(url, infoName string) (string, error) {
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body, err := self.httpGetResponse(nil, url, infoName)
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if err != nil {
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return "", err
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}
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return string(body), nil
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}
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func (self *Client) httpGetJsonData(data, postData interface{}, url, infoName string) error {
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body, err := self.httpGetResponse(postData, url, infoName)
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if err != nil {
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return err
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}
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if err = json.Unmarshal(body, data); err != nil {
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err = fmt.Errorf("unable to unmarshal %q (Body: %q) from %q with error: %v", infoName, string(body), url, err)
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return err
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}
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return nil
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}
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