Add MusicWorkshop application

backend/app/storage.py

@@ -0,0 +1,61 @@
+import json
+import sqlite3
+from pathlib import Path
+
+from .defaults import create_default_config, merge_config
+
+
+class ConfigStore:
+  def __init__(self, db_path: Path):
+    self.db_path = Path(db_path)
+    self.db_path.parent.mkdir(parents=True, exist_ok=True)
+    self._initialize()
+
+  def _connect(self):
+    connection = sqlite3.connect(self.db_path)
+    connection.row_factory = sqlite3.Row
+    return connection
+
+  def _initialize(self):
+    with self._connect() as connection:
+      connection.execute(
+        '''
+        CREATE TABLE IF NOT EXISTS app_config (
+          id INTEGER PRIMARY KEY CHECK (id = 1),
+          config_json TEXT NOT NULL,
+          updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
+        )
+        '''
+      )
+      connection.commit()
+
+  def get_config(self):
+    with self._connect() as connection:
+      row = connection.execute(
+        'SELECT config_json FROM app_config WHERE id = 1'
+      ).fetchone()
+
+    if not row:
+      config = create_default_config()
+      self.save_config(config)
+      return config
+
+    return merge_config(json.loads(row['config_json']))
+
+  def save_config(self, config):
+    normalized_config = merge_config(config)
+
+    with self._connect() as connection:
+      connection.execute(
+        '''
+        INSERT INTO app_config (id, config_json, updated_at)
+        VALUES (1, ?, CURRENT_TIMESTAMP)
+        ON CONFLICT(id) DO UPDATE SET
+          config_json = excluded.config_json,
+          updated_at = CURRENT_TIMESTAMP
+        ''',
+        (json.dumps(normalized_config),)
+      )
+      connection.commit()
+
+    return normalized_config