111 lines
3.0 KiB
Go
111 lines
3.0 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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// TODO(cAdvisor): Package comment.
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package cadvisor
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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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"strings"
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"github.com/google/cadvisor/info"
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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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// TODO(cAdvisor): Currently the error result is always nil.
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func NewClient(URL string) (*Client, error) {
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return &Client{
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baseUrl: strings.Join([]string{
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URL,
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"api/v1.0",
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}, "/"),
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}, nil
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}
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func (self *Client) machineInfoUrl() string {
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return strings.Join([]string{self.baseUrl, "machine"}, "/")
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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 *info.MachineInfo, err error) {
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u := self.machineInfoUrl()
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ret := new(info.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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func (self *Client) containerInfoUrl(name string) string {
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if name[0] == '/' {
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name = name[1:]
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}
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return strings.Join([]string{self.baseUrl, "containers", name}, "/")
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}
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func (self *Client) httpGetJsonData(data, postData interface{}, url, infoName string) 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 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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err = fmt.Errorf("unable to get %v: %v", infoName, err)
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return err
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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 %v: %v", infoName, err)
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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 %v (%v): %v", infoName, string(body), 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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// ContainerInfo returns the JSON container information for the specified
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// container and request.
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func (self *Client) ContainerInfo(name string,
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query *info.ContainerInfoRequest) (cinfo *info.ContainerInfo, err error) {
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u := self.containerInfoUrl(name)
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ret := new(info.ContainerInfo)
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if err = self.httpGetJsonData(ret, query, u, fmt.Sprintf("container info for %v", name)); err != nil {
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return
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}
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cinfo = ret
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return
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}
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