WiP: Implementing runner for migrations

migrations/0001_initial.sql

@@ -0,0 +1,19 @@
+-- Migration: 0001_initial
+-- Description: Create initial migration with user for f1tness app
+
+-- Default user schema
+-- TODO: (#ToLearn) Read about TIMESTAMP and CURRENT_TIMESTAMP
+CREATE TABLE IF NOT EXISTS users (
+  id SERIAL PRIMARY KEY,
+  username VARCHAR(250) UNIQUE NOT NULL,
+  email VARCHAR(100) UNIQUE NOT NULL,
+  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Schema for tracking applied migrations
+CREATE TABLE IF NOT EXISTS schema_migrations (
+  version VARCHAR(50) PRIMARY KEY,
+  applied_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+INSERT INTO schema_migrations (version) VALUES ('0001_initial');

migrations/runner.py

@@ -0,0 +1,49 @@
+import logging
+from pathlib import Path
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy import text
+
+
+class MigrationRunner:
+    MIGRATIONS_SCHEMA_NAME: str = "schema_migrations"
+
+    def __init__(self, database_url: str) -> None:
+        self.engine = create_async_engine(database_url)
+        self.migrations_dir = Path("migrations/sql")
+
+    async def get_applied_migrations(self) -> set:
+        """Get list of applied migrations"""
+        async with self.engine.begin() as conn:
+            # Create migrations list table if not exists
+            await conn.execute(
+                text(f"""
+                CREATE TABLE IF NOT EXISTS {self.MIGRATIONS_SCHEMA_NAME} (
+                  version VARCHAR(50) PRIMARY KEY,
+                  applied_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+                );
+            """)
+            )
+
+            # Receiving list of applied migrations
+            result = await conn.execute(
+                text(f"SELECT version FROM {self.MIGRATIONS_SCHEMA_NAME}")
+            )
+            return {row[0] for row in result.fetchall()}
+
+    async def run_migrations(self):
+        """Run all unapplied migrations"""
+        applied = await self.get_applied_migrations()
+
+        # Getting all sql files from migrations_dir
+        # TODO: (#ToLearn) Read about Path.glob function
+        migration_files = sorted([file for file in self.migrations_dir.glob(".*sql")])
+
+        for migration_file in migration_files:
+            # TODO: (#ToLearn) Read about stem property
+            migration_name = migration_file.stem
+
+            if migration_name not in applied:
+                logging.info(f"Applying migration: {migration_name}")
+                await self._apply_migration(migration_file, migration_name)
+            else:
+                logging.info(f"Skipping migration: {migration_name} (already applied)")

pyproject.toml

@@ -13,6 +13,7 @@ dependencies = [
     "python-dotenv>=1.0.1",
     "jinja2>=3.1.0",
     "python-multipart>=0.0.6",
+    "sqlalchemy>=2.0.43",
 ]
 
 [dependency-groups]

uv.lock

@@ -57,6 +57,7 @@ dependencies = [
     { name = "pytest" },
     { name = "python-dotenv" },
     { name = "python-multipart" },
+    { name = "sqlalchemy" },
     { name = "uvicorn", extra = ["standard"] },
 ]
 
@@ -76,6 +77,7 @@ requires-dist = [
     { name = "pytest", specifier = ">=8.3.4" },
     { name = "python-dotenv", specifier = ">=1.0.1" },
     { name = "python-multipart", specifier = ">=0.0.6" },
+    { name = "sqlalchemy", specifier = ">=2.0.43" },
     { name = "uvicorn", extras = ["standard"], specifier = ">=0.32.0" },
 ]
 
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