Enhance Windows Compatibility with Event Loop Policy and Path Resolution (#3986)

Co-authored-by: Suchintan <suchintan@users.noreply.github.com>
Co-authored-by: Shuchang Zheng <wintonzheng0325@gmail.com>
Co-authored-by: Stanislav Novosad <stas@skyvern.com>

skyvern/config.py

@@ -1,3 +1,7 @@
+import logging
+import platform
+from typing import Any
+
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 from skyvern import constants
@@ -16,6 +20,9 @@ _DEFAULT_ENV_FILES = (
 )
 
 
+LOG = logging.getLogger(__name__)
+
+
 class Settings(BaseSettings):
     model_config = SettingsConfigDict(env_file=_DEFAULT_ENV_FILES, extra="ignore")
 
@@ -46,7 +53,11 @@ class Settings(BaseSettings):
     LONG_RUNNING_TASK_WARNING_RATIO: float = 0.95
     MAX_RETRIES_PER_STEP: int = 5
     DEBUG_MODE: bool = False
-    DATABASE_STRING: str = "postgresql+psycopg://skyvern@localhost/skyvern"
+    DATABASE_STRING: str = (
+        "postgresql+asyncpg://skyvern@localhost/skyvern"
+        if platform.system() == "Windows"
+        else "postgresql+psycopg://skyvern@localhost/skyvern"
+    )
     DATABASE_STATEMENT_TIMEOUT_MS: int = 60000
     DISABLE_CONNECTION_POOL: bool = False
     PROMPT_ACTION_HISTORY_WINDOW: int = 1
@@ -460,6 +471,29 @@ class Settings(BaseSettings):
                 },
             }
 
+    def model_post_init(self, __context: Any) -> None:  # type: ignore[override]
+        super().model_post_init(__context)
+        if platform.system() != "Windows":
+            return
+
+        scheme, sep, remainder = self.DATABASE_STRING.partition("://")
+        if not sep:
+            return
+
+        dialect, driver_sep, driver = scheme.partition("+")
+        if not driver_sep or driver not in {"psycopg", "psycopg2"}:
+            return
+
+        updated_string = f"{dialect}+asyncpg://{remainder}"
+        if updated_string == self.DATABASE_STRING:
+            return
+
+        LOG.warning(
+            "Detected Windows environment: switching DATABASE_STRING driver from psycopg to asyncpg "
+            "for compatibility with the Proactor event loop policy."
+        )
+        object.__setattr__(self, "DATABASE_STRING", updated_string)
+
     def is_cloud_environment(self) -> bool:
         """
         :return: True if env is not local, else False