add reddit clone

.gitignore

@@ -14,7 +14,6 @@ dist/
 downloads/
 eggs/
 .eggs/
-lib/
 lib64/
 parts/
 sdist/
@@ -127,3 +126,6 @@ dmypy.json
 
 # Pyre type checker
 .pyre/
+
+# PyCharm
+.idea

reddit-clone/.dockerignore

@@ -0,0 +1,7 @@
+.git
+__pycache__
+*.pyc
+*.pyo
+*.pyd
+.Python
+env

reddit-clone/.flake8

@@ -0,0 +1,7 @@
+[flake8]
+max-line-length = 89
+exclude=.venv,.git
+ignore = W503
+extend-ignore =
+    # See https://github.com/PyCQA/pycodestyle/issues/373
+    E203,

reddit-clone/Dockerfile

@@ -0,0 +1,15 @@
+FROM python:3.9-slim
+LABEL maintainer="Aryan Iyappan <[email protected]>"
+
+ARG APP_HOME=/app/
+WORKDIR ${APP_HOME}
+
+# install poetry
+RUN pip install poetry
+
+# install dependencies
+COPY ./poetry.lock ./pyproject.toml ${APP_HOME}
+RUN poetry install --no-dev
+
+# copy project files
+COPY ./ ${APP_HOME}

reddit-clone/README.md

@@ -0,0 +1,36 @@
+# Reddit GraphQL API
+
+This example shows you how to create a Reddit API clone using GraphQL.
+The goal of this example is not to re-create the entire reddit API, but
+to produce a simpler version that is easier to understand, and implements
+most of the features that Strawberry gives us.
+
+## Tech Stack used:
+
+- [Strawberry GraphQL](https://github.com/strawberry-graphql/strawberry)
+- [Starlette](https://github.com/encode/starlette) web framework
+- [Uvicorn](https://github.com/encode/uvicorn) ASGI server
+- [SQLAlchemy](https://github.com/sqlalchemy/sqlalchemy) core/ mapper (asyncio)
+- [Alembic](https://github.com/sqlalchemy/alembic) migrations
+- [PostgreSQL](https://github.com/postgres/postgres) database server
+- [Marshmallow](https://github.com/marshmallow-code/marshmallow) data validation
+- [Celery](https://github.com/celery/celery) tasks ([Redis](https://github.com/redis/redis) store, [RabbitMQ](https://github.com/rabbitmq/rabbitmq-server) broker)
+
+## Features at a glance
+
+- [ ] Implements the Relay spec
+- [x] data modelling with relations
+- [x] Error modelling within the schema
+- [ ] Authorization with the permissions API
+- [x] Batch loading with dataloaders
+- [x] modular codebase
+
+## How to use
+
+You can use [Docker Compose](https://github.com/docker/compose) to run this example. Make sure you have it installed on your machine!
+
+```text
+docker compose up
+```
+
+You can now explore the GraphQL API here: http://localhost/graphql

reddit-clone/alembic.ini

@@ -0,0 +1,100 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = migrations
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+# defaults to the current working directory.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library that can be
+# installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to dateutil.tz.gettz()
+# leave blank for localtime
+# timezone =
+
+# max length of characters to apply to the
+# "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during
+# the 'revision' command, regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without
+# a source .py file to be detected as revisions in the
+# versions/ directory
+# sourceless = false
+
+# version location specification; This defaults
+# to migrations/versions.  When using multiple version
+# directories, initial revisions must be specified with --version-path.
+# The path separator used here should be the separator specified by "version_path_separator"
+# version_locations = %(here)s/bar:%(here)s/bat:migrations/versions
+
+# version path separator; As mentioned above, this is the character used to split
+# version_locations. Valid values are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+version_path_separator = os  # default: use os.pathsep
+
+# the output encoding used when revision files
+# are written from script.py.mako
+# output_encoding = utf-8
+
+sqlalchemy.url = driver://user:pass@localhost/dbname
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.  See the documentation for further
+# detail and examples
+
+# format using "black" - use the console_scripts runner, against the "black" entrypoint
+# hooks = black
+# black.type = console_scripts
+# black.entrypoint = black
+# black.options = -l 79 REVISION_SCRIPT_FILENAME
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

reddit-clone/docker-compose.yml

@@ -0,0 +1,113 @@
+version: "3.9"
+x-environment: &base-environment
+  DEBUG: "false"
+  CELERY_BROKER: amqp://reddit:reddit@rabbitmq:5672/
+  CELERY_BACKEND: redis://:reddit@localhost:6379/
+  DATABASE_URL: postgresql+asyncpg://reddit:reddit@postgres:5432/reddit/
+  MAIL_HOST: 127.0.0.1
+  MAIL_PORT: 25
+  MAIL_USERNAME:
+  MAIL_PASSWORD:
+  MAIL_SENDER:
+
+services:
+  nginx:
+    image: nginx:1.21-alpine
+    container_name: reddit-nginx
+    restart: always
+    networks:
+      - reddit-proxy
+    ports:
+      - 80:80
+    volumes:
+      - ./nginx/nginx.conf:/etc/nginx/conf.d/default.conf
+    depends_on:
+      - app
+
+  app:
+    build: "."
+    image: reddit-app
+    container_name: reddit-app
+    restart: always
+    command: poetry run uvicorn reddit:app --host=0.0.0.0 --port=8080
+    environment: *base-environment
+    networks:
+      - reddit-main
+      - reddit-proxy
+    volumes:
+      - .:/app
+    depends_on:
+      - postgres
+
+  celery:
+    image: reddit-app
+    container_name: reddit-celery
+    restart: always
+    command: poetry run celery -A reddit.tasks worker
+    environment: *base-environment
+    networks:
+      - reddit-main
+    volumes:
+      - .:/app
+    depends_on:
+      - rabbitmq
+      - redis
+      - app
+
+  postgres:
+    image: postgres:14-alpine
+    container_name: reddit-postgres
+    restart: always
+    environment:
+      POSTGRES_USER: reddit
+      POSTGRES_PASSWORD: reddit
+      POSTGRES_DB: reddit
+    networks:
+      - reddit-main
+    ports:
+      - 5432:5432
+    volumes:
+      - ./data/postgres:/var/lib/postgresql/data
+
+  redis:
+    image: redis:6.2-alpine
+    container_name: reddit-redis
+    restart: always
+    environment:
+      REDIS_PASSWORD: reddit
+    networks:
+      - reddit-main
+    ports:
+      - 6379:6379
+    volumes:
+      - ./data/redis:/data
+    healthcheck:
+      test: redis-cli ping
+      interval: 15s
+      retries: 5
+      timeout: 5s
+
+  rabbitmq:
+    image: rabbitmq:3.9-alpine
+    container_name: reddit-rabbitmq
+    restart: always
+    environment:
+      RABBITMQ_DEFAULT_USER: reddit
+      RABBITMQ_DEFAULT_PASS: reddit
+    networks:
+      - reddit-main
+    ports:
+      - 5672:5672
+    volumes:
+      - ./data/rabbitmq:/data
+    healthcheck:
+      test: rabbitmq-diagnostics -q ping
+      interval: 15s
+      retries: 5
+      timeout: 5s
+
+networks:
+  reddit-main:
+    driver: bridge
+  reddit-proxy:
+    driver: bridge

reddit-clone/migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration with an async dbapi.

reddit-clone/migrations/env.py

@@ -0,0 +1,96 @@
+import asyncio
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+from sqlalchemy.ext.asyncio import AsyncEngine
+
+from alembic import context
+
+from reddit.database import Base
+from reddit.settings import DATABASE_URI
+
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+config.set_main_option("sqlalchemy.url", DATABASE_URI)
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+fileConfig(config.config_file_name)
+
+# populate Base.metadata
+from reddit.users.models import User  # noqa
+from reddit.subreddits.models import Subreddit  # noqa
+from reddit.posts.models import Post  # noqa
+from reddit.comments.models import Comment  # noqa
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline():
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def do_run_migrations(connection):
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_migrations_online():
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = AsyncEngine(
+        engine_from_config(
+            config.get_section(config.config_ini_section),
+            prefix="sqlalchemy.",
+            poolclass=pool.NullPool,
+            future=True,
+        )
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    asyncio.run(run_migrations_online())