backend: api: Create database tables at startup

We might need to use Alembic for schema migrations at some point, but until then, creating the database tables when the application first starts will work fine.
backend config: Add application configuration
2022-01-25 21:45:29 -06:00 · 2022-01-25 21:45:29 -06:00 · 2022-01-25 21:44:57 -06:00 · 2022-01-18 20:24:47 -06:00
9 changed files with 651 additions and 3 deletions
--- a/backend/.gitignore
+++ b/backend/.gitignore
@ -1,4 +1,5 @@
 /.venv/
 /dist/
 /build/
-__pycache__/
+__pycache__/
+/config.yml
--- a/backend/.vscode/launch.json
+++ b/backend/.vscode/launch.json
@ -0,0 +1,18 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Backend: Web API",
+            "type": "python",
+            "request": "launch",
+            "module": "uvicorn",
+            "args": [
+                "lycodon.api.main:app"
+            ],
+            "jinja": false
+        }
+    ]
+}
--- a/backend/poetry.lock
+++ b/backend/poetry.lock
@ -1,3 +1,31 @@
+[[package]]
+name = "anyio"
+version = "3.5.0"
+description = "High level compatibility layer for multiple asynchronous event loop implementations"
+category = "main"
+optional = false
+python-versions = ">=3.6.2"
+
+[package.dependencies]
+idna = ">=2.8"
+sniffio = ">=1.1"
+
+[package.extras]
+doc = ["packaging", "sphinx-rtd-theme", "sphinx-autodoc-typehints (>=1.2.0)"]
+test = ["coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "pytest (>=6.0)", "pytest-mock (>=3.6.1)", "trustme", "contextlib2", "uvloop (<0.15)", "mock (>=4)", "uvloop (>=0.15)"]
+trio = ["trio (>=0.16)"]
+
+[[package]]
+name = "asgiref"
+version = "3.4.1"
+description = "ASGI specs, helper code, and adapters"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+tests = ["pytest", "pytest-asyncio", "mypy (>=0.800)"]
+
 [[package]]
 name = "astroid"
 version = "2.9.3"
@ -56,6 +84,24 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

+[[package]]
+name = "fastapi"
+version = "0.72.0"
+description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
+category = "main"
+optional = false
+python-versions = ">=3.6.1"
+
+[package.dependencies]
+pydantic = ">=1.6.2,<1.7 || >1.7,<1.7.1 || >1.7.1,<1.7.2 || >1.7.2,<1.7.3 || >1.7.3,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0"
+starlette = "0.17.1"
+
+[package.extras]
+all = ["requests (>=2.24.0,<3.0.0)", "jinja2 (>=2.11.2,<4.0.0)", "python-multipart (>=0.0.5,<0.0.6)", "itsdangerous (>=1.1.0,<3.0.0)", "pyyaml (>=5.3.1,<6.0.0)", "ujson (>=4.0.1,<5.0.0)", "orjson (>=3.2.1,<4.0.0)", "email_validator (>=1.1.1,<2.0.0)", "uvicorn[standard] (>=0.12.0,<0.16.0)"]
+dev = ["python-jose[cryptography] (>=3.3.0,<4.0.0)", "passlib[bcrypt] (>=1.7.2,<2.0.0)", "autoflake (>=1.4.0,<2.0.0)", "flake8 (>=3.8.3,<4.0.0)", "uvicorn[standard] (>=0.12.0,<0.16.0)"]
+doc = ["mkdocs (>=1.1.2,<2.0.0)", "mkdocs-material (>=8.1.4,<9.0.0)", "mdx-include (>=1.4.1,<2.0.0)", "mkdocs-markdownextradata-plugin (>=0.1.7,<0.3.0)", "typer-cli (>=0.0.12,<0.0.13)", "pyyaml (>=5.3.1,<6.0.0)"]
+test = ["pytest (>=6.2.4,<7.0.0)", "pytest-cov (>=2.12.0,<4.0.0)", "mypy (==0.910)", "flake8 (>=3.8.3,<4.0.0)", "black (==21.9b0)", "isort (>=5.0.6,<6.0.0)", "requests (>=2.24.0,<3.0.0)", "httpx (>=0.14.0,<0.19.0)", "email_validator (>=1.1.1,<2.0.0)", "sqlalchemy (>=1.3.18,<1.5.0)", "peewee (>=3.13.3,<4.0.0)", "databases[sqlite] (>=0.3.2,<0.6.0)", "orjson (>=3.2.1,<4.0.0)", "ujson (>=4.0.1,<5.0.0)", "python-multipart (>=0.0.5,<0.0.6)", "flask (>=1.1.2,<3.0.0)", "anyio[trio] (>=3.2.1,<4.0.0)", "types-ujson (==0.1.1)", "types-orjson (==3.6.0)", "types-dataclasses (==0.1.7)"]
+
 [[package]]
 name = "flake8"
 version = "4.0.1"
@ -69,6 +115,33 @@ mccabe = ">=0.6.0,<0.7.0"
 pycodestyle = ">=2.8.0,<2.9.0"
 pyflakes = ">=2.4.0,<2.5.0"

+[[package]]
+name = "greenlet"
+version = "1.1.2"
+description = "Lightweight in-process concurrent programming"
+category = "main"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*"
+
+[package.extras]
+docs = ["sphinx"]
+
+[[package]]
+name = "h11"
+version = "0.12.0"
+description = "A pure-Python, bring-your-own-I/O implementation of HTTP/1.1"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[[package]]
+name = "idna"
+version = "3.3"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
 [[package]]
 name = "isort"
 version = "5.10.1"
@ -152,6 +225,21 @@ category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

+[[package]]
+name = "pydantic"
+version = "1.9.0"
+description = "Data validation and settings management using python 3.6 type hinting"
+category = "main"
+optional = false
+python-versions = ">=3.6.1"
+
+[package.dependencies]
+typing-extensions = ">=3.7.4.3"
+
+[package.extras]
+dotenv = ["python-dotenv (>=0.10.4)"]
+email = ["email-validator (>=1.0.3)"]
+
 [[package]]
 name = "pyflakes"
 version = "2.4.0"
@ -188,6 +276,83 @@ python-versions = "*"
 [package.extras]
 dev = ["build", "pytest", "pytest-timeout"]

+[[package]]
+name = "ruamel.yaml"
+version = "0.17.20"
+description = "ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order"
+category = "main"
+optional = false
+python-versions = ">=3"
+
+[package.dependencies]
+"ruamel.yaml.clib" = {version = ">=0.2.6", markers = "platform_python_implementation == \"CPython\" and python_version < \"3.11\""}
+
+[package.extras]
+docs = ["ryd"]
+jinja2 = ["ruamel.yaml.jinja2 (>=0.2)"]
+
+[[package]]
+name = "ruamel.yaml.clib"
+version = "0.2.6"
+description = "C version of reader, parser and emitter for ruamel.yaml derived from libyaml"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "sniffio"
+version = "1.2.0"
+description = "Sniff out which async library your code is running under"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "sqlalchemy"
+version = "1.4.31"
+description = "Database Abstraction Library"
+category = "main"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
+
+[package.dependencies]
+greenlet = {version = "!=0.4.17", markers = "python_version >= \"3\" and (platform_machine == \"aarch64\" or platform_machine == \"ppc64le\" or platform_machine == \"x86_64\" or platform_machine == \"amd64\" or platform_machine == \"AMD64\" or platform_machine == \"win32\" or platform_machine == \"WIN32\")"}
+
+[package.extras]
+aiomysql = ["greenlet (!=0.4.17)", "aiomysql"]
+aiosqlite = ["typing_extensions (!=3.10.0.1)", "greenlet (!=0.4.17)", "aiosqlite"]
+asyncio = ["greenlet (!=0.4.17)"]
+asyncmy = ["greenlet (!=0.4.17)", "asyncmy (>=0.2.3)"]
+mariadb_connector = ["mariadb (>=1.0.1)"]
+mssql = ["pyodbc"]
+mssql_pymssql = ["pymssql"]
+mssql_pyodbc = ["pyodbc"]
+mypy = ["sqlalchemy2-stubs", "mypy (>=0.910)"]
+mysql = ["mysqlclient (>=1.4.0,<2)", "mysqlclient (>=1.4.0)"]
+mysql_connector = ["mysql-connector-python"]
+oracle = ["cx_oracle (>=7,<8)", "cx_oracle (>=7)"]
+postgresql = ["psycopg2 (>=2.7)"]
+postgresql_asyncpg = ["greenlet (!=0.4.17)", "asyncpg"]
+postgresql_pg8000 = ["pg8000 (>=1.16.6)"]
+postgresql_psycopg2binary = ["psycopg2-binary"]
+postgresql_psycopg2cffi = ["psycopg2cffi"]
+pymysql = ["pymysql (<1)", "pymysql"]
+sqlcipher = ["sqlcipher3-binary"]
+
+[[package]]
+name = "starlette"
+version = "0.17.1"
+description = "The little ASGI library that shines."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+anyio = ">=3.0.0,<4"
+
+[package.extras]
+full = ["itsdangerous", "jinja2", "python-multipart", "pyyaml", "requests"]
+
 [[package]]
 name = "toml"
 version = "0.10.2"
@ -208,10 +373,26 @@ python-versions = ">=3.6"
 name = "typing-extensions"
 version = "4.0.1"
 description = "Backported and Experimental Type Hints for Python 3.6+"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"

+[[package]]
+name = "uvicorn"
+version = "0.17.0"
+description = "The lightning-fast ASGI server."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+asgiref = ">=3.4.0"
+click = ">=7.0"
+h11 = ">=0.8"
+
+[package.extras]
+standard = ["websockets (>=10.0)", "httptools (>=0.2.0,<0.4.0)", "watchgod (>=0.6)", "python-dotenv (>=0.13)", "PyYAML (>=5.1)", "uvloop (>=0.14.0,!=0.15.0,!=0.15.1)", "colorama (>=0.4)"]
+
 [[package]]
 name = "wrapt"
 version = "1.13.3"
@ -223,9 +404,17 @@ python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "257637b1d644fbb27b0b60ab46025c5dd315bc361de01260ef847c828bcc189d"
+content-hash = "b1acad0ac357a1cf7a02aaeb3106a761b3d74fb5535f707aca1bdeae1bf4d0cf"

 [metadata.files]
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+    {file = "SQLAlchemy-1.4.31.tar.gz", hash = "sha256:582b59d1e5780a447aada22b461e50b404a9dc05768da1d87368ad8190468418"},
+]
+starlette = [
+    {file = "starlette-0.17.1-py3-none-any.whl", hash = "sha256:26a18cbda5e6b651c964c12c88b36d9898481cd428ed6e063f5f29c418f73050"},
+    {file = "starlette-0.17.1.tar.gz", hash = "sha256:57eab3cc975a28af62f6faec94d355a410634940f10b30d68d31cb5ec1b44ae8"},
+]
 toml = [
    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
@ -355,6 +723,10 @@ typing-extensions = [
    {file = "typing_extensions-4.0.1-py3-none-any.whl", hash = "sha256:7f001e5ac290a0c0401508864c7ec868be4e701886d5b573a9528ed3973d9d3b"},
    {file = "typing_extensions-4.0.1.tar.gz", hash = "sha256:4ca091dea149f945ec56afb48dae714f21e8692ef22a395223bcd328961b6a0e"},
 ]
+uvicorn = [
+    {file = "uvicorn-0.17.0-py3-none-any.whl", hash = "sha256:0b89c91bb8fe84c4bded9996af13c4b8c0de799d29bffeaa0c8ad298f2be0934"},
+    {file = "uvicorn-0.17.0.tar.gz", hash = "sha256:192c2422b056a3beb512c6c260bf77a7a884204a4ae41856719c1913ead63bbb"},
+]
 wrapt = [
    {file = "wrapt-1.13.3-cp27-cp27m-macosx_10_9_x86_64.whl", hash = "sha256:e05e60ff3b2b0342153be4d1b597bbcfd8330890056b9619f4ad6b8d5c96a81a"},
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--- a/backend/pyproject.toml
+++ b/backend/pyproject.toml
@ -7,6 +7,9 @@ license = "MIT"

 [tool.poetry.dependencies]
 python = "^3.8"
+fastapi = "^0.72.0"
+SQLAlchemy = "^1.4.31"
+"ruamel.yaml" = "^0.17.20"

 [tool.poetry.dev-dependencies]
 black = "^21.12b0"
@ -15,6 +18,7 @@ isort = "^5.10.1"
 mypy = "^0.931"
 pylint = "^2.12.2"
 rope = "^0.22.0"
+uvicorn = "^0.17.0"

 [build-system]
 requires = ["poetry-core>=1.0.0"]
--- a/backend/src/lycodon/api/init.py
+++ b/backend/src/lycodon/api/init.py
--- a/backend/src/lycodon/api/context.py
+++ b/backend/src/lycodon/api/context.py
@ -0,0 +1,30 @@
+'''Runtime state context
+
+The :py:class:`Context` class is instantiated when the web server
+process starts and maintains the application's runtime state.  The
+context is available to request handlers using the
+:py:func:`get_context` function via FastAPI dependency injection.
+
+.. code:: python
+
+    @app.get('/foo')
+    def get_foo(context: Context = fastapi.Depends(get_context)):
+        ...
+'''
+import fastapi
+
+from ..config import Configuration
+
+
+class Context:
+    '''Application context'''
+
+    config: Configuration
+    '''Application configuration'''
+
+
+def get_context(request: fastapi.Request) -> Context:
+    '''Dependency function to access the application context'''
+
+    context: Context = request.scope['lycodon_ctx']
+    return context
--- a/backend/src/lycodon/api/main.py
+++ b/backend/src/lycodon/api/main.py
@ -0,0 +1,45 @@
+'''Lycodon Web API Server'''
+from typing import Awaitable, Callable
+
+import fastapi
+import sqlalchemy
+
+from .. import __version__, tables
+from ..config import Configuration
+from .context import Context
+
+
+app = fastapi.FastAPI(
+    title='Lycodon',
+    description='Lycodon is a music library manager.',
+    version=__version__,
+    docs_url='/api-doc/',
+    redoc_url=None,
+)
+
+
+# Application context
+context = Context()
+context.config = Configuration()
+
+
+@app.on_event('startup')
+def start() -> None:
+    engine = sqlalchemy.create_engine(context.config.database.url)
+    tables.metadata.create_all(engine)
+
+
+@app.middleware('http')
+async def context_middleware(
+    request: fastapi.Request,
+    call_next: Callable[[fastapi.Request], Awaitable[fastapi.Response]],
+) -> fastapi.Response:
+    '''Middleware to add the Application Context to the request scope
+
+    This middleware function adds the :py:class:`Context` to the
+    ASGI request scope.  To retrieve it, use
+    :py:func:`lycodon.api.context.get_context`.
+    '''
+
+    request.scope['lycodon_ctx'] = context
+    return await call_next(request)
--- a/backend/src/lycodon/config.py
+++ b/backend/src/lycodon/config.py
@ -0,0 +1,44 @@
+import os
+from pathlib import Path
+from typing import IO, Optional, Union
+
+import pydantic
+from ruamel import yaml
+
+
+class DatabaseConfiguration(pydantic.BaseModel):
+    '''Database configuration'''
+
+    url: str = 'sqlite:///lycodon.db'
+    '''Database connection URL'''
+
+
+class Configuration(pydantic.BaseModel):
+    '''Application configuration'''
+
+    database: DatabaseConfiguration = DatabaseConfiguration()
+    '''Database configuration'''
+
+    @classmethod
+    def load(cls, path: Optional[Union[Path, str]] = None) -> 'Configuration':
+        '''Load configuration from the specified file
+
+        :param path: Path to the configuration file
+        '''
+
+        if path is None:
+            path = Path(os.environ.get('LYCODON_CONFIG', 'config.yml'))
+        elif not isinstance(path, Path):
+            path = Path(path)
+        with path.open('r', encoding='utf-8') as f:
+            return cls.from_file(f)
+
+    @classmethod
+    def from_file(cls, f: IO[str]) -> 'Configuration':
+        '''Load configuration from an open file buffer
+
+        :param f: Open readable file object
+        '''
+
+        values = yaml.safe_load(f) or {}
+        return cls.parse_obj(values)
--- a/backend/src/lycodon/tables.py
+++ b/backend/src/lycodon/tables.py
@ -0,0 +1,134 @@
+import sqlalchemy
+
+
+metadata = sqlalchemy.MetaData()
+
+
+file = sqlalchemy.Table(
+    'file',
+    metadata,
+    sqlalchemy.Column(
+        'id',
+        sqlalchemy.Integer,
+        autoincrement=True,
+        primary_key=True,
+    ),
+    sqlalchemy.Column(
+        'path',
+        sqlalchemy.Text(999),
+        nullable=False,
+        unique=True,
+    ),
+    sqlalchemy.Column(
+        'last_modified',
+        sqlalchemy.DateTime(),
+        nullable=False,
+    ),
+    sqlalchemy.Column(
+        'size',
+        sqlalchemy.Integer,
+        nullable=False,
+    ),
+)
+
+
+artist = sqlalchemy.Table(
+    'artist',
+    metadata,
+    sqlalchemy.Column(
+        'id',
+        sqlalchemy.Integer,
+        autoincrement=True,
+        primary_key=True,
+    ),
+    sqlalchemy.Column(
+        'name',
+        sqlalchemy.Text(999),
+        nullable=False,
+    ),
+    sqlalchemy.Column(
+        'mbid',
+        sqlalchemy.Text(36),
+        default=None,
+    ),
+)
+
+
+album = sqlalchemy.Table(
+    'album',
+    metadata,
+    sqlalchemy.Column(
+        'id',
+        sqlalchemy.Integer,
+        autoincrement=True,
+        primary_key=True,
+    ),
+    sqlalchemy.Column(
+        'title',
+        sqlalchemy.Text(999),
+        nullable=False,
+    ),
+    sqlalchemy.Column(
+        'artist_id',
+        sqlalchemy.Integer,
+        sqlalchemy.ForeignKey('artist.id'),
+        nullable=False,
+    ),
+    sqlalchemy.Column(
+        'mbid',
+        sqlalchemy.Text(36),
+        default=None,
+    ),
+    sqlalchemy.Column(
+        'date',
+        sqlalchemy.Text(10),
+        default=None,
+    ),
+)
+
+
+track = sqlalchemy.Table(
+    'track',
+    metadata,
+    sqlalchemy.Column(
+        'id',
+        sqlalchemy.Integer,
+        autoincrement=True,
+        primary_key=True,
+    ),
+    sqlalchemy.Column(
+        'title',
+        sqlalchemy.Text(999),
+        nullable=False,
+    ),
+    sqlalchemy.Column(
+        'album_id',
+        sqlalchemy.Integer,
+        sqlalchemy.ForeignKey('album.id'),
+    ),
+    sqlalchemy.Column(
+        'artist_id',
+        sqlalchemy.Integer,
+        sqlalchemy.ForeignKey('artist.id'),
+    ),
+    sqlalchemy.Column(
+        'mbid',
+        sqlalchemy.Text(36),
+        default=None,
+    ),
+    sqlalchemy.Column(
+        'number',
+        sqlalchemy.Integer,
+        default=None,
+    ),
+    sqlalchemy.Column(
+        'disc',
+        sqlalchemy.Integer,
+        default=None,
+    ),
+    sqlalchemy.Column(
+        'genre',
+        sqlalchemy.Text(99),
+        default=None,
+    ),
+)
Author	SHA1	Message	Date
Dustin	0ab0ef8874	backend: api: Create database tables at startup We might need to use Alembic for schema migrations at some point, but until then, creating the database tables when the application first starts will work fine.	2022-01-25 21:45:29 -06:00
Dustin	e33502eee1	backend config: Add application configuration Configuration is managed as a Pydantic model and can be loaded from a YAML document.	2022-01-25 21:45:29 -06:00
Dustin	46bc1869af	backend: tables: Begin data model Using SQLAlchemy Core for query building, composition, etc.	2022-01-25 21:44:57 -06:00
Dustin	40cbde78e0	backend: Begin web API server The web API server is built using FastAPI. Although there are several issues with the framework, and it is basically unmaintained at this point, I still like it better than the alternatives. Django is too big and cumbersome, and its async story still needs improvement. I do not like Flask at all. Starlette would be great, but OpenAPI spec generation is too useful to give up, and the solutions for Starlette are not nearly as good as FastAPI, even with its bugs and limitations. Ultimately, the development experience with FastAPI is unmatched, and for this project, I want to develop quickly.	2022-01-18 20:24:47 -06:00