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main.go
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main.go
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package main
import (
"os"
"bytes"
"encoding/json"
"encoding/base64"
"flag"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httputil"
"time"
"strings"
"path/filepath"
"github.com/davecgh/go-spew/spew"
"golang.org/x/net/websocket"
"github.com/gorilla/handlers"
)
var port = flag.String("port", "8888", "Port for server")
var host = flag.String("host", "127.0.0.1:2735", "Docker host")
var contextPath = ""
var wwwroot = ""
func main() {
fmt.Println("Application starting..")
flag.Parse()
if cp := os.Getenv("CONTEXT_PATH"); cp != "" {
contextPath = strings.TrimRight(cp, "/")
}
if wr := os.Getenv("WWWROOT_PATH"); wr != "" {
wwwroot = strings.TrimRight(wr, "/")
} else {
executableFolderPath, err := filepath.Abs(filepath.Dir(os.Args[0]))
if err != nil {
panic(err)
}
wwwroot = executableFolderPath + "/wwwroot"
}
fmt.Println("contextPath is "+contextPath+"/")
fmt.Println("wwwroot is "+wwwroot)
http.Handle(contextPath + "/exec/", websocket.Handler(ExecContainer))
http.Handle(contextPath + "/", http.StripPrefix(contextPath + "/", http.FileServer(http.Dir(wwwroot))))
fmt.Println("Waiting for http requests on port "+*port)
if err := http.ListenAndServe(":"+*port, handlers.LoggingHandler(os.Stdout, http.DefaultServeMux)); err != nil {
panic(err)
}
fmt.Println("Application stoping..")
}
func ExecContainer(ws *websocket.Conn) {
wsParams := strings.Split(ws.Request().URL.Path[len(contextPath + "/exec/"):], ",")
container := wsParams[0]
cmd, _ := base64.StdEncoding.DecodeString(wsParams[1])
if container == "" {
ws.Write([]byte("Container does not exist"))
return
}
type stuff struct {
Id string
}
var s stuff
params := bytes.NewBufferString("{\"AttachStdin\":true,\"AttachStdout\":true,\"AttachStderr\":true,\"Tty\":true,\"Cmd\":[\"" + string(cmd) + "\"]}")
resp, err := http.Post("http://" + *host + "/containers/" + container + "/exec", "application/json", params)
if err != nil {
panic(err)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
panic(err)
}
json.Unmarshal([]byte(data), &s)
if err := hijack(*host, "POST", "/exec/"+s.Id+"/start", true, ws, ws, ws, nil, nil); err != nil {
panic(err)
}
fmt.Println("Connection!")
fmt.Println(ws)
spew.Dump(ws)
}
func hijack(addr, method, path string, setRawTerminal bool, in io.ReadCloser, stdout, stderr io.Writer, started chan io.Closer, data interface{}) error {
params := bytes.NewBufferString("{\"Detach\": false, \"Tty\": true}")
req, err := http.NewRequest(method, path, params)
if err != nil {
return err
}
req.Header.Set("User-Agent", "Docker-Client")
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Connection", "Upgrade")
req.Header.Set("Upgrade", "tcp")
req.Host = addr
dial, err := net.Dial("tcp", addr)
// When we set up a TCP connection for hijack, there could be long periods
// of inactivity (a long running command with no output) that in certain
// network setups may cause ECONNTIMEOUT, leaving the client in an unknown
// state. Setting TCP KeepAlive on the socket connection will prohibit
// ECONNTIMEOUT unless the socket connection truly is broken
if tcpConn, ok := dial.(*net.TCPConn); ok {
tcpConn.SetKeepAlive(true)
tcpConn.SetKeepAlivePeriod(30 * time.Second)
}
if err != nil {
return err
}
clientconn := httputil.NewClientConn(dial, nil)
defer clientconn.Close()
// Server hijacks the connection, error 'connection closed' expected
clientconn.Do(req)
rwc, br := clientconn.Hijack()
defer rwc.Close()
if started != nil {
started <- rwc
}
var receiveStdout chan error
if stdout != nil || stderr != nil {
go func() (err error) {
if setRawTerminal && stdout != nil {
_, err = io.Copy(stdout, br)
}
return err
}()
}
go func() error {
if in != nil {
io.Copy(rwc, in)
}
if conn, ok := rwc.(interface {
CloseWrite() error
}); ok {
if err := conn.CloseWrite(); err != nil {
}
}
return nil
}()
if stdout != nil || stderr != nil {
if err := <-receiveStdout; err != nil {
return err
}
}
spew.Dump(br)
go func() {
for {
fmt.Println(br)
spew.Dump(br)
}
}()
return nil
}