135 lines
2.9 KiB
Go
135 lines
2.9 KiB
Go
// ollie-httpgw - HTTP gateway for ollie session management.
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//
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// Translates HTTP requests to D-Bus calls against org.ollie.SessionManager.
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//
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// Usage:
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//
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// ollie-httpgw [start|fgstart|stop|status]
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package main
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import (
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_ "embed"
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"encoding/json"
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"flag"
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"fmt"
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"log"
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"net"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"syscall"
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)
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//go:embed openapi.json
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var openapiSpec []byte
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var listen = flag.String("listen", ":8011", "HTTP listen address")
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const pidFile = "ollie-httpgw.pid"
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func main() {
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args := os.Args[1:]
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if len(args) >= 1 {
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subcmd := args[0]
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switch subcmd {
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case "start", "fgstart", "stop", "status":
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flag.CommandLine.Parse(args[1:]) //nolint:errcheck
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ns := os.Getenv("NAMESPACE")
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if ns == "" {
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ns = fmt.Sprintf("/tmp/ns.%s.:0", os.Getenv("USER"))
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}
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pidPath := filepath.Join(ns, pidFile)
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switch subcmd {
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case "start":
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if gwRunning() {
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fmt.Println("ollie-httpgw already running")
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os.Exit(0)
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}
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daemonize()
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case "fgstart":
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if gwRunning() {
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fmt.Println("ollie-httpgw already running")
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os.Exit(0)
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}
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runGateway(pidPath)
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case "stop":
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stopGateway(pidPath)
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case "status":
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if gwRunning() {
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fmt.Println("ollie-httpgw running")
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} else {
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fmt.Println("ollie-httpgw not running")
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os.Exit(1)
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}
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}
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return
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}
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}
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// No subcommand — run in foreground directly (no pid file).
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flag.CommandLine.Parse(args) //nolint:errcheck
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serve()
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}
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func gwRunning() bool {
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conn, err := net.Dial("tcp", *listen)
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if err == nil {
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conn.Close()
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return true
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}
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return false
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}
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func daemonize() {
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exe, _ := os.Executable()
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args := []string{"fgstart", "-listen", *listen}
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cmd := exec.Command(exe, args...)
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cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
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if err := cmd.Start(); err != nil {
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fmt.Fprintf(os.Stderr, "failed to start: %v\n", err)
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os.Exit(1)
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}
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fmt.Printf("ollie-httpgw started (pid %d)\n", cmd.Process.Pid)
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}
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func stopGateway(pidPath string) {
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data, err := os.ReadFile(pidPath)
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if err != nil {
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fmt.Println("ollie-httpgw not running")
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return
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}
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var pid int
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fmt.Sscanf(string(data), "%d", &pid)
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if pid > 0 {
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syscall.Kill(pid, syscall.SIGTERM) //nolint:errcheck
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}
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os.Remove(pidPath) //nolint:errcheck
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fmt.Println("ollie-httpgw stopped")
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}
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func runGateway(pidPath string) {
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os.WriteFile(pidPath, fmt.Appendf(nil, "%d", os.Getpid()), 0644) //nolint:errcheck
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serve()
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os.Remove(pidPath) //nolint:errcheck
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}
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func serve() {
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http.HandleFunc("/openapi.json", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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w.Write(openapiSpec)
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})
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http.HandleFunc("/", dbusHandler)
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log.Printf("ollie-httpgw listening on %s", *listen)
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log.Fatal(http.ListenAndServe(*listen, nil))
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}
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func writeJSON(w http.ResponseWriter, status int, v any) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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json.NewEncoder(w).Encode(v)
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}
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