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zeus.go
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zeus.go
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package zeus
import (
"syscall"
"os"
"encoding/json"
"os/exec"
"fmt"
"errors"
)
type StageBootInfo struct {
Pid int
Identifier string
}
func runInitialCommand(sock *os.File) {
cmd := exec.Command("/Users/burke/.rbenv/shims/ruby", "/Users/burke/go/src/github.com/burke/zeus/a.rb")
cmd.Env = append(os.Environ(), fmt.Sprintf("ZEUS_MASTER_FD=%d", sock.Fd()))
cmd.ExtraFiles = []*os.File{sock}
go cmd.Run()
}
func Run () (error) {
masterSockLocal, masterSockRemote, err := socketpair(syscall.SOCK_DGRAM)
if err != nil {
return err
}
masterUSockLocal, err := makeUnixSocket(masterSockLocal)
if err != nil {
return err
}
runInitialCommand(masterSockRemote)
// Having just started the process, we expect an IO, which we convert to a UNIX domain socket
_, fd, err := readFromUnixSocket(masterUSockLocal)
if err != nil {
return err
}
if fd < 0 {
return errors.New("expected file descriptor, but got none")
}
clientFile := fdToFile(fd, "boot-sock")
clientSocket, err := makeUnixSocket(clientFile)
if err != nil {
return err
}
// We now expect the client to use this fd they send us to send a JSON-encoded representation of their PID and identifier...
msg, _, err := readFromUnixSocket(clientSocket)
if err != nil {
return err
}
var bootInfo StageBootInfo
err = json.Unmarshal([]byte(msg), &bootInfo)
if err != nil {
return err
}
// Now that we have that, we look up and send the action for that identifier:
clientSocket.Write([]byte("File.open('omg.log','a'){|f|f.puts 'HAHA BUSINESS TIME'}"))
// It will respond with its status
msg, _, err = readFromUnixSocket(clientSocket)
if err != nil {
return err
}
if msg == "OK" {
clientSocket.Write([]byte("default_bundle"))
} else {
return errors.New(msg)
}
// And now we could instruct it to fork:
return nil
}