peephole: Add env variable defaults

Signed-off-by: Sebastian Wicki <[email protected]>

README.md

@@ -7,6 +7,6 @@ Prosody room statistics for one single room (configured via `PEEPHOLE_ROOM_NAME`
 ## Environment variables
 
 - `PEEPHOLE_ROOM_NAME` _(required)_: Room name for which statistics are exposed (example: `[email protected]`)
-- `PEEPHOLE_HTTP_ADDR` _(required)_: Address on which the peephole HTTP server will listen on (example: `:8080`)
-- `XMPP_SERVER` _(required)_: Hostname of the Prosody HTTP service (example: `xmpp.meet.jitsi`)
-- `PROSODY_HTTP_PORT` _(required)_: Port of the Prosody HTTP service (example `5280`)
+- `PEEPHOLE_HTTP_ADDR` _(default `:9339`)_: Address on which the peephole HTTP server will listen on
+- `XMPP_SERVER` _(default `xmpp.meet.jitsi`)_: Hostname of the Prosody HTTP service
+- `PROSODY_HTTP_PORT` _(default `5280`)_: Port of the Prosody HTTP service

main.go

@@ -12,11 +12,11 @@ import (
 )
 
 var (
- roomName = envVar("PEEPHOLE_ROOM_NAME")
- httpAddr = envVar("PEEPHOLE_HTTP_ADDR")
+ roomName = envRequired("PEEPHOLE_ROOM_NAME")
+ httpAddr = envOrDefault("PEEPHOLE_HTTP_ADDR", ":9339")
 
- prosodyHTTPHost = envVar("XMPP_SERVER")
- prosodyHTTPPort = envVar("PROSODY_HTTP_PORT")
+ prosodyHTTPHost = envOrDefault("XMPP_SERVER", "xmpp.meet.jitsi")
+ prosodyHTTPPort = envOrDefault("PROSODY_HTTP_PORT", "5280")
 
  roomCensusURL = (&url.URL{
  Scheme: "http",
@@ -25,7 +25,7 @@ var (
  }).String()
 )
 
-func envVar(name string) string {
+func envRequired(name string) string {
  val := os.Getenv(name)
  if val == "" {
  slog.Error("missing environment variable", slog.String("name", name))
@@ -34,6 +34,14 @@ func envVar(name string) string {
  return val
 }
 
+func envOrDefault(name, fallback string) string {
+ val := os.Getenv(name)
+ if val == "" {
+ return fallback
+ }
+ return val
+}
+
 type room struct {
  RoomName string `json:"room_name"`
  Participants int `json:"participants"`