chore: align identity settings with pydantic v2 (#425)

Author: shayancoin

services/identity/__init__.py

@@ -0,0 +1,43 @@
+"""Application settings for the identity service."""
+
+from functools import lru_cache
+from typing import Any
+
+from pydantic import Field, PostgresDsn, RedisDsn, field_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    """Configuration values loaded from the environment."""
+
+    database_dsn: PostgresDsn = Field(
+        default="postgresql://postgres:postgres@localhost:5432/identity",
+        description="PostgreSQL DSN used for the identity service database.",
+    )
+    redis_dsn: RedisDsn = Field(
+        default="redis://localhost:6379/0",
+        description="Redis DSN used for caching and rate limiting.",
+    )
+
+    model_config = SettingsConfigDict(
+        env_file=(".env", ".env.local"),
+        env_file_encoding="utf-8",
+        case_sensitive=False,
+        extra="allow",
+    )
+
+    @field_validator("database_dsn", "redis_dsn", mode="before")
+    @classmethod
+    def _strip_whitespace(cls, value: Any) -> Any:
+        """Normalize DSN values by trimming extraneous whitespace."""
+
+        if isinstance(value, str):
+            return value.strip()
+        return value
+
+
+@lru_cache
+def get_settings() -> Settings:
+    """Return a cached :class:`Settings` instance."""
+
+    return Settings()

services/identity/app/__init__.py

@@ -0,0 +1,20 @@
+[tool.poetry]
+name = "identity-service"
+version = "0.1.0"
+description = "Identity service"
+authors = ["Example <example@example.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.11"
+fastapi = "^0.111.0"
+pydantic = "^2.6.0"
+pydantic-settings = "^2.2.1"
+uvicorn = { extras = ["standard"], version = "^0.29.0" }
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^8.1.0"
+httpx = "^0.27.0"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"