init auth-service

services/auth-service/auth_service/postgres/migrations/000001_init_auth.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS auth_methods CASCADE;

services/auth-service/auth_service/postgres/migrations/000001_init_auth.up.sql

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+CREATE TABLE auth_methods (
+    "user_id" varchar(64) PRIMARY KEY,
+    "password" varchar(128) NOT NULL
+);

services/auth-service/auth_service/postgres/repository.py

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+from typing import Optional
+
+from databases import Database
+
+from auth_service.models.service import AuthDBRepository, AuthRecord
+
+
+class ServiceDBRepository(AuthDBRepository):
+    """Database repository responsible for CRUD actions 
+    on the database.
+    
+    This repository will be utilised by other upstream repositories
+    or the Kafka event consumers.
+
+    Attributes:
+        _db (Database): The postgres database connection handler.
+
+    """
+    def __init__(self, db: Database) -> None:
+        self._db = db
+
+    async def get_auth_record(self, user_id: str) -> Optional[AuthRecord]:
+        query = "SELECT user_id, password FROM auth_methods WHERE user_id = :user_id"
+        result = await self._db.fetch_one(query=query, values={"user_id": user_id})
+        if result is None:
+            return None
+        return AuthRecord(user_id=result["user_id"], password=result["password"])
+
+    async def create_password_auth_method(self, user_id: str, password: str) -> None:
+        query = "INSERT INTO auth_methods (user_id, password) VALUES (:user_id, :password)"
+        await self._db.execute(query=query, values={"user_id": user_id, "password": password})
+
+    async def update_password_auth_method(self, user_id: str, password: str) -> None:
+        query = "UPDATE auth_methods SET password = :password WHERE user_id = :user_id"
+        await self._db.execute(query=query, values={"user_id": user_id, "password": password})
+
+    async def delete_password_auth_method(self, user_id: str) -> None:
+        query = "DELETE FROM auth_methods WHERE user_id = :user_id"
+        await self._db.execute(query=query, values={"user_id": user_id})

services/auth-service/auth_service/postgres/service.py

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+import logging
+
+from databases import Database
+
+from auth_service.models.config import Config
+from auth_service.postgres.repository import ServiceDBRepository
+
+
+async def connect_database(config: Config) -> Database:
+    """Opens a connection to the database.
+    
+    Args:
+        config (Config): The app configuration.
+
+    Returns:
+        A connected databases.Database instance
+
+    """
+    db = Database(config.postgres_dsn)
+    try:
+        await db.connect()
+    except Exception:
+        logging.error("failed to connect to postgresql database")
+        raise
+    
+    return db
+
+
+async def create_db_repository(config: Config) -> ServiceDBRepository:
+    """Create the database repository.
+    
+    Open a database connection and instantialise the
+    database repository.
+
+    Returns:
+        ServiceDBRepository
+    
+    """
+    db = await connect_database(config)
+    return ServiceDBRepository(db)