Use default Connection for backend/solana-connect and properly reset …

…onUnlock

packages/background/src/backend/solana-connection.ts

@@ -12,6 +12,7 @@ import {
   Blockchain,
   confirmTransaction,
   customSplTokenAccounts,
+  DEFAULT_SOLANA_CLUSTER,
   fetchSplMetadataUri,
   getLogger,
   NOTIFICATION_BLOCKCHAIN_KEYRING_CREATED,
@@ -110,9 +111,12 @@ export function start(events: EventEmitter): SolanaConnectionBackend {
   return b;
 }
 
+const defaultSolanaUrl =
+  process.env.DEFAULT_SOLANA_CONNECTION_URL || DEFAULT_SOLANA_CLUSTER;
+
 export class SolanaConnectionBackend {
   private cache = new Map<string, CachedValue<any>>();
-  private connection?: Connection;
+  private connection?: Connection = new Connection(defaultSolanaUrl);
   private url?: string;
   private pollIntervals: Array<any>;
   private events: EventEmitter;
@@ -184,6 +188,7 @@ export class SolanaConnectionBackend {
     };
 
     const handleKeyringStoreLocked = (_notif: Notification) => {
+      this.connection = new Connection(defaultSolanaUrl);
       this.stopPolling();
     };