feat: create backend skeleton

backend/src/utils/env.py

@@ -0,0 +1,63 @@
+import os
+
+from pydantic import Field, SecretStr
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class DatabaseSettings(BaseSettings):
+    host: str = "postgres"
+    port: int = 5432
+    user: str = "beavergram"
+    password: SecretStr = SecretStr("beavergram")
+    db_name: str = "beavergram"
+    min_pool_size: int = 5
+    max_pool_size: int = 20
+    scripts_connection_url: str = (
+        "postgresql://beavergram:beavergram@localhost:5433/beavergram"
+    )
+
+    @property
+    def connection_url(self) -> str:
+        if os.getenv("RUN_ENVIRONMENT") != "prod":
+            return self.scripts_connection_url
+        return (
+            f"postgresql://{self.user}:{self.password.get_secret_value()}"
+            f"@{self.host}:{self.port}/{self.db_name}"
+        )
+
+
+class TelegramSettings(BaseSettings):
+    session_name: str = "beavergram"
+    sessions_dir: str = "sessions"
+
+
+class ApiSettings(BaseSettings):
+    host: str = "0.0.0.0"  # noqa: S104
+    port: int = 8080
+
+
+class StorageSettings(BaseSettings):
+    root: str = "storage"
+    shard_depth: int = 2
+
+
+class LogSettings(BaseSettings):
+    level: str = "INFO"
+    level_external: str = "WARNING"
+    show_time: bool = False
+    console_width: int = 150
+
+
+class Settings(BaseSettings):
+    db: DatabaseSettings = Field(default_factory=DatabaseSettings)
+    tg: TelegramSettings = Field(default_factory=TelegramSettings)
+    api: ApiSettings = Field(default_factory=ApiSettings)
+    storage: StorageSettings = Field(default_factory=StorageSettings)
+    log: LogSettings = Field(default_factory=LogSettings)
+
+    model_config = SettingsConfigDict(
+        case_sensitive=False, env_file=".env", env_nested_delimiter="__", extra="ignore"
+    )
+
+
+env = Settings()