Add support for discovering new PDSs from relays

cmd/consumer/main.go

@@ -35,6 +35,7 @@ type Config struct {
 	LogLevel    int64  `default:"1"`
 	MetricsPort string `split_words:"true"`
 	DBUrl       string `envconfig:"POSTGRES_URL"`
+	Relays      string
 }
 
 var config Config
@@ -54,6 +55,16 @@ func runMain(ctx context.Context) error {
 	}
 	log.Debug().Msgf("DB connection established")
 
+	if config.Relays != "" {
+		for _, host := range strings.Split(config.Relays, ",") {
+			c, err := NewRelayConsumer(ctx, host, db)
+			if err != nil {
+				log.Error().Err(err).Msgf("Failed to create relay consumer for %q: %s", host, err)
+			}
+			c.Start(ctx)
+		}
+	}
+
 	consumersCh := make(chan struct{})
 	go runConsumers(ctx, db, consumersCh)
 
@@ -160,6 +171,7 @@ func main() {
 	flag.StringVar(&config.LogFile, "log", "", "Path to the log file. If empty, will log to stderr")
 	flag.StringVar(&config.LogFormat, "log-format", "text", "Logging format. 'text' or 'json'")
 	flag.Int64Var(&config.LogLevel, "log-level", 1, "Log level. -1 - trace, 0 - debug, 1 - info, 5 - panic")
+	flag.StringVar(&config.Relays, "relays", "", "List of relays to connect to (for discovering new PDSs)")
 
 	if err := envconfig.Process("consumer", &config); err != nil {
 		log.Fatalf("envconfig.Process: %s", err)