connect to relays once per call instead of in each iteration and fail early if no connection works.

helpers.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"strings"
 
+	"github.com/nbd-wtf/go-nostr"
 	"github.com/urfave/cli/v2"
 )
 
@@ -99,6 +100,21 @@ func validate32BytesHex(target string) error {
 	return nil
 }
 
+func connectToAllRelays(ctx context.Context, relayUrls []string) (*nostr.SimplePool, []*nostr.Relay) {
+	relays := make([]*nostr.Relay, 0, len(relayUrls))
+	pool := nostr.NewSimplePool(ctx)
+	for _, url := range relayUrls {
+		fmt.Fprintf(os.Stderr, "connecting to %s... ", url)
+		if relay, err := pool.EnsureRelay(url); err == nil {
+			relays = append(relays, relay)
+			fmt.Fprintf(os.Stderr, "ok.\n")
+		} else {
+			fmt.Fprintf(os.Stderr, err.Error()+"\n")
+		}
+	}
+	return pool, relays
+}
+
 func lineProcessingError(c *cli.Context, msg string, args ...any) {
 	c.Context = context.WithValue(c.Context, LINE_PROCESSING_ERROR, true)
 	fmt.Fprintf(os.Stderr, msg+"\n", args...)