Add DNS retry logic to Drift initialization

- Handles transient network failures (EAI_AGAIN, ENOTFOUND, ETIMEDOUT)
- Automatically retries up to 3 times with 2s delay between attempts
- Logs retry attempts for monitoring
- Prevents 500 errors from temporary DNS hiccups
- Fixes: n8n workflow failures during brief network issues

Impact:
- Improves reliability during DNS/network instability
- Reduces false negatives (missed trades due to transient errors)
- User-friendly retry logs for diagnostics

lib/drift/client.ts

@@ -75,8 +75,52 @@ export class DriftService {
     console.log('✅ Drift service created for wallet:', this.wallet.publicKey.toString())
   }
 
+  /**
+   * Retry helper for handling transient network failures (DNS, timeouts)
+   */
+  private async retryOperation<T>(
+    operation: () => Promise<T>,
+    maxRetries: number = 3,
+    delayMs: number = 2000,
+    operationName: string = 'operation'
+  ): Promise<T> {
+    let lastError: Error | null = null
+    
+    for (let attempt = 1; attempt <= maxRetries; attempt++) {
+      try {
+        return await operation()
+      } catch (error: any) {
+        lastError = error
+        
+        // Check if it's a transient network error
+        const isTransient = 
+          error?.message?.includes('fetch failed') ||
+          error?.message?.includes('EAI_AGAIN') ||
+          error?.message?.includes('ENOTFOUND') ||
+          error?.message?.includes('ETIMEDOUT') ||
+          error?.message?.includes('ECONNREFUSED') ||
+          error?.code === 'EAI_AGAIN' ||
+          error?.cause?.code === 'EAI_AGAIN'
+        
+        if (!isTransient || attempt === maxRetries) {
+          // Non-transient error or max retries reached - fail immediately
+          throw error
+        }
+        
+        console.log(`⚠️ ${operationName} failed (attempt ${attempt}/${maxRetries}): ${error?.message || error}`)
+        console.log(`⏳ Retrying in ${delayMs}ms...`)
+        
+        // Wait before retry
+        await new Promise(resolve => setTimeout(resolve, delayMs))
+      }
+    }
+    
+    throw lastError || new Error(`${operationName} failed after ${maxRetries} retries`)
+  }
+
   /**
    * Initialize Drift client and subscribe to account updates
+   * Includes automatic retry for transient network failures (DNS, timeouts)
    */
   async initialize(): Promise<void> {
     if (this.isInitialized) {
@@ -87,33 +131,36 @@ export class DriftService {
     try {
       console.log('🚀 Initializing Drift Protocol client...')
 
-      // Initialize Drift SDK (gets program IDs and config)
-      const sdkConfig = initialize({
-        env: this.config.env === 'devnet' ? 'devnet' : 'mainnet-beta'
-      })
+      // Wrap initialization in retry logic to handle DNS failures
+      await this.retryOperation(async () => {
+        // Initialize Drift SDK (gets program IDs and config)
+        const sdkConfig = initialize({
+          env: this.config.env === 'devnet' ? 'devnet' : 'mainnet-beta'
+        })
 
-      // Create Drift client with manual wallet and SDK config
-      this.driftClient = new DriftClient({
-        connection: this.connection,
-        wallet: this.wallet as any, // Type assertion for compatibility
-        programID: new PublicKey(sdkConfig.DRIFT_PROGRAM_ID),
-        opts: {
-          commitment: 'confirmed',
-        },
-      })
+        // Create Drift client with manual wallet and SDK config
+        this.driftClient = new DriftClient({
+          connection: this.connection,
+          wallet: this.wallet as any, // Type assertion for compatibility
+          programID: new PublicKey(sdkConfig.DRIFT_PROGRAM_ID),
+          opts: {
+            commitment: 'confirmed',
+          },
+        })
 
-      // Subscribe to Drift account updates
-      await this.driftClient.subscribe()
-      console.log('✅ Drift client subscribed to account updates')
+        // Subscribe to Drift account updates (this makes RPC calls)
+        await this.driftClient.subscribe()
+        console.log('✅ Drift client subscribed to account updates')
 
-      // Get user account
-      this.user = this.driftClient.getUser()
+        // Get user account
+        this.user = this.driftClient.getUser()
+      }, 3, 2000, 'Drift initialization')
       
       this.isInitialized = true
       console.log('✅ Drift service initialized successfully')
       
     } catch (error) {
-      console.error('❌ Failed to initialize Drift service:', error)
+      console.error('❌ Failed to initialize Drift service after retries:', error)
       throw error
     }
   }