fix: Add user agent and fix backoff socket dialer logic

The websocket backoff logic was not properly configured and so would
relentlessly spam the web socket endpoint with connect requests. Woops.

Also provide a user agent in the header when requesting to be polite
with server.

firehose/firehose.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"net/http"
 	"norsky/models"
 	"strings"
 	"time"
@@ -25,12 +26,21 @@ import (
 // Subscribe to the firehose using the Firehose struct as a receiver
 func Subscribe(ctx context.Context, postChan chan interface{}, ticker *time.Ticker, seq int64) {
 	address := "wss://bsky.network/xrpc/com.atproto.sync.subscribeRepos"
+	headers := http.Header{}
+	headers.Set("User-Agent", "NorSky: https://github.com/snorremd/norsky")
+
 	if seq >= 0 {
 		log.Info("Starting from sequence: ", seq)
 		address = fmt.Sprintf("%s?cursor=%d", address, seq)
 	}
+	// Identify dialer with User-Agent header
+
 	dialer := websocket.DefaultDialer
 	backoff := backoff.NewExponentialBackOff()
+	backoff.InitialInterval = 3 * time.Second
+	backoff.MaxInterval = 30 * time.Second
+	backoff.Multiplier = 1.5
+	backoff.MaxElapsedTime = 120 * time.Second
 
 	// Check if context is cancelled, if so exit the connection loop
 	for {