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run.go
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run.go
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package main
import (
"crypto/tls"
"fmt"
"io"
"log"
"net"
"net/http/httputil"
"net/url"
"os"
"strconv"
"strings"
"github.com/docker/docker/pkg/term"
"github.com/remind101/empire/pkg/heroku"
"github.com/remind101/empire/pkg/stdcopy"
)
var (
detachedRun bool
dynoSize string
)
var cmdRun = &Command{
Run: maybeMessage(runRun),
Usage: "run [-s <size>] [-d] <command> [<argument>...]",
NeedsApp: true,
OptionalMessage: true,
Category: "dyno",
Short: "run a process in a dyno",
Long: `
Run a process on Heroku. Flags such as` + " `-a` " + `may be parsed out of
the command unless the command is quoted or provided after a
double-dash (--).
When running an attached process that reads from stdin (like bash) you may experience a "hang".
Usually, pressing a key like "enter" will flush the output to your terminal.
See https://github.com/remind101/empire/issues/609
Options:
-s <size> set the size for this dyno (e.g. 2X)
-d run in detached mode instead of attached to terminal
Examples:
$ emp run echo "hello"
Running ` + "`echo \"hello\"`" + ` on myapp as run.1234:
"hello"
$ emp run console
Running ` + "`console`" + ` on myapp as run.5678:
Loading production environment (Rails 3.2.14)
irb(main):001:0> ...
$ emp run -d -s 2X bin/my_worker
Ran ` + "`bin/my_worker`" + ` on myapp as run.4321, detached.
$ emp run -a myapp -- ls -a /
Running ` + "`ls -a bin /`" + ` on myapp as run.8650:
/:
. .. app bin dev etc home lib lib64 lost+found proc sbin tmp usr var
`,
}
func init() {
cmdRun.Flag.BoolVarP(&detachedRun, "detached", "d", false, "detached")
cmdRun.Flag.StringVarP(&dynoSize, "size", "s", "", "dyno size")
}
func runRun(cmd *Command, args []string) {
if len(args) == 0 {
cmd.PrintUsage()
os.Exit(2)
}
appname := mustApp()
message := getMessage()
w, err := term.GetWinsize(inFd)
if err != nil {
// If syscall.TIOCGWINSZ is not supported by the device, we're
// probably trying to run tests. Set w to some sensible default.
if err.Error() == "operation not supported by device" {
w = &term.Winsize{
Height: 20,
Width: 80,
}
} else {
printFatal(err.Error())
}
}
attached := !detachedRun
opts := heroku.DynoCreateOpts{Attach: &attached, Message: message}
if attached {
env := map[string]string{
"COLUMNS": strconv.Itoa(int(w.Width)),
"LINES": strconv.Itoa(int(w.Height)),
"TERM": os.Getenv("TERM"),
}
opts.Env = &env
}
if dynoSize != "" {
opts.Size = &dynoSize
}
command := strings.Join(args, " ")
if detachedRun {
dyno, err := client.DynoCreate(appname, command, &opts)
must(err)
log.Printf("Ran `%s` on %s as %s, detached.", dyno.Command, appname, dyno.Name)
return
}
params := struct {
Command string `json:"command"`
Attach *bool `json:"attach,omitempty"`
Env *map[string]string `json:"env,omitempty"`
Size *string `json:"size,omitempty"`
}{
Command: command,
Attach: opts.Attach,
Env: opts.Env,
Size: opts.Size,
}
rh := heroku.RequestHeaders{CommitMessage: message}
header := rh.Headers()
header.Set("X-Multiplex", "1")
req, err := client.NewRequest("POST", "/apps/"+appname+"/dynos", params, header)
must(err)
u, err := url.Parse(apiURL)
must(err)
proto, address := dialParams(u)
var dial net.Conn
if proto == "tls" {
dial, err = tlsDial("tcp", address, &tls.Config{})
if err != nil {
printFatal(err.Error())
}
} else {
dial, err = net.Dial(proto, address)
if err != nil {
printFatal(err.Error())
}
}
clientconn := httputil.NewClientConn(dial, nil)
defer clientconn.Close()
res, err := clientconn.Do(req)
defer res.Body.Close()
if err = heroku.CheckResp(res); err != nil {
printFatal(err.Error())
}
if err != nil && err != httputil.ErrPersistEOF {
printFatal(err.Error())
}
rwc, br := clientconn.Hijack()
defer rwc.Close()
if isTerminalIn && isTerminalOut {
state, err := term.SetRawTerminal(inFd)
if err != nil {
printFatal(err.Error())
}
defer term.RestoreTerminal(inFd, state)
}
errChanOut := make(chan error, 1)
errChanIn := make(chan error, 1)
exit := make(chan bool)
go func() {
defer close(exit)
defer close(errChanOut)
var err error
if res.Header.Get("Content-Type") == "application/vnd.empire.stdcopy-stream" {
_, err = stdcopy.StdCopy(os.Stdout, os.Stderr, br)
} else {
_, err = io.Copy(os.Stdout, br)
}
errChanOut <- err
}()
go func() {
_, err := io.Copy(rwc, os.Stdin)
errChanIn <- err
rwc.(interface {
CloseWrite() error
}).CloseWrite()
}()
<-exit
select {
case err = <-errChanIn:
must(err)
case err = <-errChanOut:
must(err)
}
}
func dialParams(u *url.URL) (proto, address string) {
// u.Host can be either host or host:port
host, port := splitHost(u.Host)
switch u.Scheme {
case "https":
proto = "tls"
if port == "" {
port = "443"
}
case "http":
proto = "tcp"
if port == "" {
port = "80"
}
default:
panic(fmt.Sprintf("I don't know what to do for the %v protocol", u.Scheme))
}
address = fmt.Sprintf("%s:%s", host, port)
return
}
func splitHost(hostPort string) (host, port string) {
parts := strings.SplitN(hostPort, ":", 2)
host = parts[0]
if len(parts) == 2 {
port = parts[1]
}
return
}