feat: Add Aliyun SLS (Simple Log Service) integration for workflow execution logging (#28986)

Co-authored-by: hieheihei <270985384@qq.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: -LAN- <laipz8200@outlook.com>

api/extensions/ext_logstore.py

@@ -0,0 +1,74 @@
+"""
+Logstore extension for Dify application.
+
+This extension initializes the logstore (Aliyun SLS) on application startup,
+creating necessary projects, logstores, and indexes if they don't exist.
+"""
+
+import logging
+import os
+
+from dotenv import load_dotenv
+
+from dify_app import DifyApp
+
+logger = logging.getLogger(__name__)
+
+
+def is_enabled() -> bool:
+    """
+    Check if logstore extension is enabled.
+
+    Returns:
+        True if all required Aliyun SLS environment variables are set, False otherwise
+    """
+    # Load environment variables from .env file
+    load_dotenv()
+
+    required_vars = [
+        "ALIYUN_SLS_ACCESS_KEY_ID",
+        "ALIYUN_SLS_ACCESS_KEY_SECRET",
+        "ALIYUN_SLS_ENDPOINT",
+        "ALIYUN_SLS_REGION",
+        "ALIYUN_SLS_PROJECT_NAME",
+    ]
+
+    all_set = all(os.environ.get(var) for var in required_vars)
+
+    if not all_set:
+        logger.info("Logstore extension disabled: required Aliyun SLS environment variables not set")
+
+    return all_set
+
+
+def init_app(app: DifyApp):
+    """
+    Initialize logstore on application startup.
+
+    This function:
+    1. Creates Aliyun SLS project if it doesn't exist
+    2. Creates logstores (workflow_execution, workflow_node_execution) if they don't exist
+    3. Creates indexes with field configurations based on PostgreSQL table structures
+
+    This operation is idempotent and only executes once during application startup.
+
+    Args:
+        app: The Dify application instance
+    """
+    try:
+        from extensions.logstore.aliyun_logstore import AliyunLogStore
+
+        logger.info("Initializing logstore...")
+
+        # Create logstore client and initialize project/logstores/indexes
+        logstore_client = AliyunLogStore()
+        logstore_client.init_project_logstore()
+
+        # Attach to app for potential later use
+        app.extensions["logstore"] = logstore_client
+
+        logger.info("Logstore initialized successfully")
+    except Exception:
+        logger.exception("Failed to initialize logstore")
+        # Don't raise - allow application to continue even if logstore init fails
+        # This ensures that the application can still run if logstore is misconfigured