mirror of https://github.com/k3s-io/k3s
131 lines
3.4 KiB
Go
131 lines
3.4 KiB
Go
// Copyright 2017 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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package crio
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import (
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"syscall"
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"time"
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)
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const (
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CrioSocket = "/var/run/crio/crio.sock"
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maxUnixSocketPathSize = len(syscall.RawSockaddrUnix{}.Path)
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)
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// Info represents CRI-O information as sent by the CRI-O server
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type Info struct {
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StorageDriver string `json:"storage_driver"`
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StorageRoot string `json:"storage_root"`
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}
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// ContainerInfo represents a given container information
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type ContainerInfo struct {
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Name string `json:"name"`
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Pid int `json:"pid"`
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Image string `json:"image"`
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CreatedTime int64 `json:"created_time"`
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Labels map[string]string `json:"labels"`
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Annotations map[string]string `json:"annotations"`
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LogPath string `json:"log_path"`
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Root string `json:"root"`
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IP string `json:"ip_address"`
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}
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type crioClient interface {
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Info() (Info, error)
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ContainerInfo(string) (*ContainerInfo, error)
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}
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type crioClientImpl struct {
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client *http.Client
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}
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func configureUnixTransport(tr *http.Transport, proto, addr string) error {
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if len(addr) > maxUnixSocketPathSize {
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return fmt.Errorf("Unix socket path %q is too long", addr)
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}
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// No need for compression in local communications.
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tr.DisableCompression = true
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tr.Dial = func(_, _ string) (net.Conn, error) {
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return net.DialTimeout(proto, addr, 32*time.Second)
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}
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return nil
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}
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// Client returns a new configured CRI-O client
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func Client() (crioClient, error) {
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tr := new(http.Transport)
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configureUnixTransport(tr, "unix", CrioSocket)
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c := &http.Client{
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Transport: tr,
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}
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return &crioClientImpl{
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client: c,
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}, nil
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}
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func getRequest(path string) (*http.Request, error) {
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req, err := http.NewRequest("GET", path, nil)
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if err != nil {
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return nil, err
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}
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// For local communications over a unix socket, it doesn't matter what
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// the host is. We just need a valid and meaningful host name.
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req.Host = "crio"
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req.URL.Host = CrioSocket
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req.URL.Scheme = "http"
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return req, nil
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}
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// Info returns generic info from the CRI-O server
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func (c *crioClientImpl) Info() (Info, error) {
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info := Info{}
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req, err := getRequest("/info")
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if err != nil {
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return info, err
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}
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resp, err := c.client.Do(req)
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if err != nil {
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return info, err
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}
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defer resp.Body.Close()
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if err := json.NewDecoder(resp.Body).Decode(&info); err != nil {
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return info, err
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}
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return info, nil
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}
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// ContainerInfo returns information about a given container
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func (c *crioClientImpl) ContainerInfo(id string) (*ContainerInfo, error) {
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req, err := getRequest("/containers/" + id)
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if err != nil {
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return nil, err
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}
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resp, err := c.client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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cInfo := ContainerInfo{}
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if err := json.NewDecoder(resp.Body).Decode(&cInfo); err != nil {
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return nil, err
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}
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return &cInfo, nil
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}
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