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getDatas.go
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getDatas.go
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//main 获取数据的,具体的动作函数都在这里
package main
import (
"fmt"
"io/ioutil"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strings"
//"github.com/gooops/micadvisor_open/docker"
)
//v0.25 默认暴露8080端口
var CadvisorPort = "18080"
func getTag(_dockerdata DockerInspectStruct) string {
// //FIXMI:some other message for container
// return ""
var tags []string
for i, u := range _dockerdata.Config.Labels {
//LogRun("gettag: " + i + u)
tags = append(tags, i+":"+u)
}
return strings.Join(tags, ",")
}
func getCadvisorData() (string, error) {
//LogRun("come in function getCadvisorData ....")
var (
resp *http.Response
err error
body []byte
)
url := "http://localhost:" + CadvisorPort + "/api/v1.2/docker"
if resp, err = http.Get(url); err != nil {
LogErr(err, "Get err in getCadvisorData")
return "", err
}
//LogRun("function getCadvisorData localhost:port/api/v1.2/docker")
defer resp.Body.Close()
if body, err = ioutil.ReadAll(resp.Body); err != nil {
LogErr(err, "ReadAll err in getCadvisorData")
return "", err
}
return string(body), nil
}
//getOneContainerCadvisorData 获取某个容器的cadvisor JSON信息。
func getOneContainerCadvisorData(_oneContainerID string) (string, error) {
var (
resp *http.Response
err error
body []byte
)
url := "http://localhost:" + CadvisorPort + "/api/v1.2/docker/" + _oneContainerID
if resp, err = http.Get(url); err != nil {
//LogErr(err, "from getOneContainerCadvisorData function ")
return "", err
}
defer resp.Body.Close()
if body, err = ioutil.ReadAll(resp.Body); err != nil {
//LogErr(err, "from getOneContainerCadvisorData function ReadAll ")
return "", err
}
return string(body), nil
}
func getEndPoint(_containerName string) string {
// hostname, err := os.Hostname()
// if err != nil {
// LogErr(err, "getDatas.go get hostname err")
// }
// return hostname + "-" + strings.Trim(_containerName, "/")
var EndPointPrefix string
addrs, err := net.InterfaceAddrs()
if err != nil {
fmt.Println(err)
LogErr(err, "getDatas.go get ipaddress err")
}
for _, address := range addrs {
// 检查ip地址判断是否回环地址
if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
if ipnet.IP.To4() != nil {
//fmt.Println(ipnet.IP.String())
EndPointPrefix = ipnet.IP.String() // 第一个非lookbackip被拿到之后就退出。
break
}
}
}
return EndPointPrefix + "-" + strings.Trim(_containerName, "/")
}
// 获取容器的inspect信息,手动方法 (echo -e "GET /containers/XXXXXXXXXX/json HTTP/1.1\r\nHost: www.test.com\r\n")|nc -U //var/run/docker.sock
func getDockerData(containerId string) (string, error) {
str, err := RequestUnixSocket("/containers/"+containerId+"/json", "GET")
if err != nil {
//LogErr(err, "getDatas.go getDockerData err")
return "", err
}
return str, nil
}
//getAllDockerDataBrief 获取所有容器的基本信息,手动方法 (echo -e "GET /containers/json HTTP/1.1\r\nHost: www.test.com\r\n")|nc -U //var/run/docker.sock
func getAllDockerBrief() (string, error) {
str, err := RequestUnixSocket("/containers/json", "GET")
if err != nil {
//LogErr(err, "getDatas.go getAllDockerBrief err")
return "", err
}
return str, nil
}
//RequestUnixSocket 使用docker自身的api获取数据
func RequestUnixSocket(address, method string) (string, error) {
DOCKER_UNIX_SOCKET := "unix:///var/run/docker.sock"
// Example: unix:///var/run/docker.sock:/images/json?since=1374067924
unix_socket_url := DOCKER_UNIX_SOCKET + ":" + address
u, err := url.Parse(unix_socket_url)
if err != nil || u.Scheme != "unix" {
LogErr(err, "getDatas.go Error to parse unix socket url "+unix_socket_url)
return "", err
}
hostPath := strings.Split(u.Path, ":")
u.Host = hostPath[0]
u.Path = hostPath[1]
conn, err := net.Dial("unix", u.Host)
if err != nil {
LogErr(err, "getDatas.go Error to connect to"+u.Host)
// fmt.Println("Error to connect to", u.Host, err)
return "", err
}
reader := strings.NewReader("")
query := ""
if len(u.RawQuery) > 0 {
query = "?" + u.RawQuery
}
request, err := http.NewRequest(method, u.Path+query, reader)
if err != nil {
LogErr(err, "getDatas.go Error to create http request")
// fmt.Println("Error to create http request", err)
return "", err
}
client := httputil.NewClientConn(conn, nil)
response, err := client.Do(request)
if err != nil {
LogErr(err, "getDatas.go Error to achieve http request over unix socket")
// fmt.Println("Error to achieve http request over unix socket", err)
return "", err
}
body, err := ioutil.ReadAll(response.Body)
if err != nil {
LogErr(err, "getDatas.go Error, get invalid body in answer")
// fmt.Println("Error, get invalid body in answer")
return "", err
}
defer response.Body.Close()
return string(body), err
}