112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
package common
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import (
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"fmt"
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"io/ioutil"
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"log"
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"math/rand"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"github.com/hashicorp/packer/packer"
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"github.com/mitchellh/multistep"
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)
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// This step creates and runs the HTTP server that is serving files from the
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// directory specified by the 'http_directory` configuration parameter in the
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// template.
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//
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// Uses:
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// ui packer.Ui
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//
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// Produces:
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// http_port int - The port the HTTP server started on.
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type StepHTTPServer struct {
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HTTPDir string
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HTTPPortMin uint
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HTTPPortMax uint
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l net.Listener
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}
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func (s *StepHTTPServer) Run(state multistep.StateBag) multistep.StepAction {
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ui := state.Get("ui").(packer.Ui)
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var httpPort uint = 0
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if s.HTTPDir == "" {
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state.Put("http_port", httpPort)
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return multistep.ActionContinue
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}
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// Find an available TCP port for our HTTP server
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var httpAddr string
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portRange := int(s.HTTPPortMax - s.HTTPPortMin)
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for {
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var err error
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var offset uint = 0
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if portRange > 0 {
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// Intn will panic if portRange == 0, so we do a check.
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// Intn is from [0, n), so add 1 to make from [0, n]
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offset = uint(rand.Intn(portRange + 1))
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}
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httpPort = offset + s.HTTPPortMin
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httpAddr = fmt.Sprintf("0.0.0.0:%d", httpPort)
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log.Printf("Trying port: %d", httpPort)
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s.l, err = net.Listen("tcp", httpAddr)
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if err == nil {
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break
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}
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}
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ui.Say(fmt.Sprintf("Starting HTTP server on port %d", httpPort))
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// Start the HTTP server and run it in the background
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fileServer := http.FileServer(http.Dir(s.HTTPDir))
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server := &http.Server{Addr: httpAddr, Handler: fileServer}
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go server.Serve(s.l)
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// Save the address into the state so it can be accessed in the future
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state.Put("http_port", httpPort)
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SetHTTPPort(fmt.Sprintf("%d", httpPort))
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return multistep.ActionContinue
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}
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func httpAddrFilename(suffix string) string {
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uuid := os.Getenv("PACKER_RUN_UUID")
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return filepath.Join(os.TempDir(), fmt.Sprintf("packer-%s-%s", uuid, suffix))
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}
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func SetHTTPPort(port string) error {
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return ioutil.WriteFile(httpAddrFilename("port"), []byte(port), 0644)
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}
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func SetHTTPIP(ip string) error {
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return ioutil.WriteFile(httpAddrFilename("ip"), []byte(ip), 0644)
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}
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func GetHTTPAddr() string {
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ip, err := ioutil.ReadFile(httpAddrFilename("ip"))
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if err != nil {
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return ""
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}
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port, err := ioutil.ReadFile(httpAddrFilename("port"))
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if err != nil {
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return ""
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}
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return fmt.Sprintf("%s:%s", ip, port)
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}
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func (s *StepHTTPServer) Cleanup(multistep.StateBag) {
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if s.l != nil {
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// Close the listener so that the HTTP server stops
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s.l.Close()
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}
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os.Remove(httpAddrFilename("port"))
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os.Remove(httpAddrFilename("ip"))
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}
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