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package common
import (
"fmt"
"github.com/mitchellh/multistep"
"github.com/mitchellh/packer/packer"
"log"
"math/rand"
"net"
"net/http"
)
// This step creates and runs the HTTP server that is serving files from the
// directory specified by the 'http_directory` configuration parameter in the
// template.
//
// Uses:
// ui packer.Ui
//
// Produces:
// http_port int - The port the HTTP server started on.
type StepHTTPServer struct {
HTTPDir string
HTTPPortMin uint
HTTPPortMax uint
l net.Listener
}
func (s *StepHTTPServer) Run(state multistep.StateBag) multistep.StepAction {
ui := state.Get("ui").(packer.Ui)
var httpPort uint = 0
if s.HTTPDir == "" {
state.Put("http_port", httpPort)
return multistep.ActionContinue
}
// Find an available TCP port for our HTTP server
var httpAddr string
portRange := int(s.HTTPPortMax - s.HTTPPortMin)
for {
var err error
var offset uint = 0
if portRange > 0 {
// Intn will panic if portRange == 0, so we do a check.
offset = uint(rand.Intn(portRange))
}
httpPort = offset + s.HTTPPortMin
httpAddr = fmt.Sprintf("0.0.0.0:%d", httpPort)
log.Printf("Trying port: %d", httpPort)
s.l, err = net.Listen("tcp", httpAddr)
if err == nil {
break
}
}
ui.Say(fmt.Sprintf("Starting HTTP server on port %d", httpPort))
// Start the HTTP server and run it in the background
fileServer := http.FileServer(http.Dir(s.HTTPDir))
server := &http.Server{Addr: httpAddr, Handler: fileServer}
go server.Serve(s.l)
// Save the address into the state so it can be accessed in the future
state.Put("http_port", httpPort)
return multistep.ActionContinue
}
func (s *StepHTTPServer) Cleanup(multistep.StateBag) {
if s.l != nil {
// Close the listener so that the HTTP server stops
s.l.Close()
}
}
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