feat: make SQLALCHEMY_POOL_TIMEOUT configurable (#25468)

Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/.env.example

@@ -76,6 +76,7 @@ DB_HOST=localhost
 DB_PORT=5432
 DB_DATABASE=dify
 SQLALCHEMY_POOL_PRE_PING=true
+SQLALCHEMY_POOL_TIMEOUT=30
 
 # Storage configuration
 # use for store upload files, private keys...

api/configs/middleware/__init__.py

@@ -187,6 +187,11 @@ class DatabaseConfig(BaseSettings):
         default=False,
     )
 
+    SQLALCHEMY_POOL_TIMEOUT: NonNegativeInt = Field(
+        description="Number of seconds to wait for a connection from the pool before raising a timeout error.",
+        default=30,
+    )
+
     RETRIEVAL_SERVICE_EXECUTORS: NonNegativeInt = Field(
         description="Number of processes for the retrieval service, default to CPU cores.",
         default=os.cpu_count() or 1,
@@ -216,6 +221,7 @@ class DatabaseConfig(BaseSettings):
             "connect_args": connect_args,
             "pool_use_lifo": self.SQLALCHEMY_POOL_USE_LIFO,
             "pool_reset_on_return": None,
+            "pool_timeout": self.SQLALCHEMY_POOL_TIMEOUT,
         }
 
 

api/tests/unit_tests/configs/test_dify_config.py

@@ -91,6 +91,7 @@ def test_flask_configs(monkeypatch: pytest.MonkeyPatch):
         "pool_size": 30,
         "pool_use_lifo": False,
         "pool_reset_on_return": None,
+        "pool_timeout": 30,
     }
 
     assert config["CONSOLE_WEB_URL"] == "https://example.com"