feat: add retry logic with exponential backoff for transient errors

Retry connection/timeout errors with backoff, skip retry for rate limits

tradingagents/dataflows/interface.py

@@ -1,4 +1,5 @@
 from typing import Annotated
+import time
 
 # Import from vendor-specific modules
 from .local import get_YFin_data, get_finnhub_news, get_finnhub_company_insider_sentiment, get_finnhub_company_insider_transactions, get_simfin_balance_sheet, get_simfin_cashflow, get_simfin_income_statements, get_reddit_global_news, get_reddit_company_news
@@ -16,6 +17,7 @@ from .alpha_vantage import (
     get_news as get_alpha_vantage_news
 )
 from .alpha_vantage_common import AlphaVantageRateLimitError
+from openai import APIConnectionError, APITimeoutError, RateLimitError
 
 # Configuration and routing logic
 from .config import get_config
@@ -194,25 +196,58 @@ def route_to_vendor(method: str, *args, **kwargs):
         else:
             vendor_methods = [(vendor_impl, vendor)]
 
-        # Run methods for this vendor
+        # Run methods for this vendor with retry logic
         vendor_results = []
         for impl_func, vendor_name in vendor_methods:
-            try:
-                print(f"DEBUG: Calling {impl_func.__name__} from vendor '{vendor_name}'...")
-                result = impl_func(*args, **kwargs)
-                vendor_results.append(result)
-                print(f"SUCCESS: {impl_func.__name__} from vendor '{vendor_name}' completed successfully")
-                    
-            except AlphaVantageRateLimitError as e:
-                if vendor == "alpha_vantage":
-                    print(f"RATE_LIMIT: Alpha Vantage rate limit exceeded, falling back to next available vendor")
+            max_retries = 3
+            base_delay = 1.0
+            last_error = None
+
+            for retry_attempt in range(max_retries):
+                try:
+                    if retry_attempt > 0:
+                        print(f"RETRY: Attempt {retry_attempt + 1}/{max_retries} "
+                              f"for {impl_func.__name__}")
+                    else:
+                        print(f"DEBUG: Calling {impl_func.__name__} "
+                              f"from vendor '{vendor_name}'...")
+
+                    result = impl_func(*args, **kwargs)
+                    vendor_results.append(result)
+                    print(f"SUCCESS: {impl_func.__name__} from vendor "
+                          f"'{vendor_name}' completed successfully")
+                    last_error = None
+                    break  # Success, exit retry loop
+
+                except AlphaVantageRateLimitError as e:
+                    print(f"RATE_LIMIT: Alpha Vantage rate limit exceeded")
                     print(f"DEBUG: Rate limit details: {e}")
-                # Continue to next vendor for fallback
-                continue
-            except Exception as e:
-                # Log error but continue with other implementations
-                print(f"FAILED: {impl_func.__name__} from vendor '{vendor_name}' failed: {e}")
-                continue
+                    last_error = e
+                    break  # Don't retry rate limits, move to next vendor
+
+                except (ConnectionError, TimeoutError, OSError,
+                        APIConnectionError, APITimeoutError, RateLimitError) as e:
+                    # Transient errors - retry with backoff
+                    last_error = e
+                    if retry_attempt < max_retries - 1:
+                        delay = base_delay * (2 ** retry_attempt)
+                        print(f"TRANSIENT_ERROR: {type(e).__name__} - {e}")
+                        print(f"RETRY: Waiting {delay}s before retry...")
+                        time.sleep(delay)
+                    else:
+                        print(f"FAILED: {impl_func.__name__} from vendor "
+                              f"'{vendor_name}' failed after {max_retries} "
+                              f"attempts: {e}")
+
+                except Exception as e:
+                    # Non-transient errors - don't retry
+                    last_error = e
+                    print(f"FAILED: {impl_func.__name__} from vendor "
+                          f"'{vendor_name}' failed: {type(e).__name__}: {e}")
+                    break
+
+            if last_error is not None:
+                continue  # Move to next implementation
 
         # Add this vendor's results
         if vendor_results: