add graphql intro

022-burette/magnum_opus_iii/.gitignore

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+*.egg-info
+.tox
+Pipfile
+.env
+.nenv

022-burette/magnum_opus_iii/Dockerfile

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+FROM python:3-alpine
+
+RUN addgroup -S user && adduser user -S -G user
+
+WORKDIR /home/user/
+
+COPY requirements.txt   .
+COPY gunicorn_config.py .
+COPY setup.py           .
+COPY setup.cfg          .
+COPY init_entrypoint.sh /
+
+RUN pip install hypercorn
+RUN pip install -r requirements.txt
+
+USER user
+
+EXPOSE 5000
+
+ENTRYPOINT []
+
+CMD hypercorn --config python:./gunicorn_config.py magnumopus.index:app
+
+COPY magnumopus         magnumopus

022-burette/magnum_opus_iii/MANIFEST.in

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+

022-burette/magnum_opus_iii/README.md

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+Magnum Opus
+===========
+
+Recipe maker for the philosopher's stone.
+
+
+    python3 -m pytest --cov magnumopus >> README.md
+
+    ============================= test session starts ==============================
+    platform linux -- Python 3.8.2, pytest-5.4.3, py-1.9.0, pluggy-0.13.1
+    rootdir: /home/philtweir/Work/Training/PythonCourse/python-course/022-burette/magnum_opus
+    plugins: pep8-1.0.6, cov-2.10.0
+    collected 15 items
+
+    tests/domain/test_alembic.py .......                                     [ 46%]
+    tests/domain/test_pantry.py ..                                           [ 60%]
+    tests/domain/test_substance.py ......                                    [100%]
+
+    ----------- coverage: platform linux, python 3.8.2-final-0 -----------
+    Name                                                 Stmts   Miss  Cover
+    ------------------------------------------------------------------------
+    magnumopus/__init__.py                                  10      8    20%
+    magnumopus/config.py                                     4      4     0%
+    magnumopus/index.py                                      2      2     0%
+    magnumopus/initialize.py                                 6      6     0%
+    magnumopus/logger.py                                     4      4     0%
+    magnumopus/models/__init__.py                            3      1    67%
+    magnumopus/models/base.py                                2      0   100%
+    magnumopus/models/substance.py                          24      0   100%
+    magnumopus/repositories/__init__.py                      0      0   100%
+    magnumopus/repositories/pantry.py                       12      1    92%
+    magnumopus/repositories/sqlalchemy_pantry.py            15     15     0%
+    magnumopus/resources/__init__.py                         7      7     0%
+    magnumopus/resources/alembic_instruction.py             26     26     0%
+    magnumopus/resources/substance.py                       28     28     0%
+    magnumopus/schemas/__init__.py                           4      4     0%
+    magnumopus/schemas/substance_schema.py                  11     11     0%
+    magnumopus/services/__init__.py                          0      0   100%
+    magnumopus/services/alembic.py                          32      2    94%
+    magnumopus/services/alembic_instruction_handler.py      20     20     0%
+    magnumopus/services/assessor.py                          2      2     0%
+    ------------------------------------------------------------------------
+    TOTAL                                                  212    141    33%
+
+
+    ============================== 15 passed in 0.38s ==============================

022-burette/magnum_opus_iii/RULES.md

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+* One unit of each of the substances Mercury, Salt and Sulphur are mixed, using my "Alembic" (mixing pot), giving one unit of another substance, Gloop
+* Any attempt to mix anything other than those three substances, gives Sludge, another substance
+* Substances can undergo several Processes in my Alembic - they can be Cooked, Washed, Pickled or Fermented
+* If Gloop is Cooked, Washed, Pickled and Fermented, in that order, it is the Philosopher's Stone (panacea and cure of all ills)
+[* To process a Substance, at least one unit must be in my Pantry, including Gloop - even when freshly processed/created, it must be stored there before re-use (to cool)]
+
+Final rule:
+GROUP 1: When I process a substance, using any process, it becomes a different substance
+GROUP 2: When I process a substance, its state changes but is essentially the same substance (NB: mixing is not a process)

022-burette/magnum_opus_iii/docker-compose.yml

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+version: "3"
+services:
+  web_async_gql:
+    build: .
+    environment:
+      DATABASE_URI: 'sqlite:////docker/storage/storage.db'
+    volumes:
+      - ./docker:/docker
+      - ./magnumopus:/home/user/magnumopus
+    ports:
+      - 5000:5000

022-burette/magnum_opus_iii/gunicorn_config.py

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+port = '5000'
+bind = "0.0.0.0:%s" % port
+workers = 1
+timeout = 600
+reload = False

022-burette/magnum_opus_iii/init_containers.sh

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+#!/bin/sh
+
+mkdir -p docker/storage
+
+docker-compose run --user root web /init_entrypoint.sh
+docker-compose run web python3 -m magnumopus.initialize

022-burette/magnum_opus_iii/init_entrypoint.sh

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+#!/bin/sh
+
+chown -R user:user /docker/storage

022-burette/magnum_opus_iii/magnumopus/__init__.py

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+from quart_openapi import Pint
+
+def create_app():
+    from . import models, resources, schemas, logger, repositories, injection, graph
+
+    app = Pint(__name__, title='Magnum Opus')
+
+    # This could be used to separate by environment
+    app.config.from_object('magnumopus.config.Config')
+
+    # This helps avoid cyclic dependencies
+    modules = []
+
+    modules += logger.init_app(app)
+    modules += models.init_app(app)
+    modules += resources.init_app(app)
+    modules += repositories.init_app(app)
+    modules += schemas.init_app(app)
+    modules += graph.init_app(app)
+
+    injection.init_app(app, modules)
+
+    return app

022-burette/magnum_opus_iii/magnumopus/config.py

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+import os
+
+class Config:
+    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URI', 'sqlite:///:memory:')
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+
+    PANTRY_STORE = os.environ.get('MAGNUMOPUS_PANTRY_STORE', 'list')

022-burette/magnum_opus_iii/magnumopus/graph.py

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+from quart import request, jsonify
+from ariadne import ObjectType, make_executable_schema, graphql
+from ariadne.constants import PLAYGROUND_HTML
+
+from .repositories import PANTRY_STORES
+
+PANTRY = PANTRY_STORES['list']
+
+type_defs = """
+    type Query {
+        substances(nature: String!): [Substance]
+    }
+
+    type Substance {
+        nature: String!,
+        state: [String]!
+    }
+"""
+
+query = ObjectType('Query')
+substance = ObjectType('Substance')
+
+@query.field('substances')
+def resolve_substances(obj, *_, nature='Unknown'):
+    return PANTRY.find_substances_by_nature(nature)
+
+
+@substance.field('nature')
+def resolve_nature(obj, *_):
+    return obj.nature
+
+@substance.field('state')
+def resolve_state(obj, *_):
+    return obj.state
+
+schema = make_executable_schema(type_defs, query, substance)
+
+async def graphql_server():
+    data = await request.get_json()
+    success, result = await graphql(
+        schema,
+        data,
+        context_value=request
+    )
+
+    return jsonify(result), (200 if success else 400)
+
+def init_app(app):
+    app.route('/graphql', methods=['GET'], endpoint='graphql_playground')(
+        lambda: (PLAYGROUND_HTML, 200)
+    )
+
+    app.route('/graphql', methods=['POST'], endpoint='graphql_server')(
+        graphql_server
+    )
+
+    return []

022-burette/magnum_opus_iii/magnumopus/index.py

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+from . import create_app
+
+app = create_app()

022-burette/magnum_opus_iii/magnumopus/initialize.py

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+from . import create_app
+from .models import db
+
+if __name__ == "__main__":
+    # There are nicer ways around this, but this keeps it clear for an example
+    app = create_app()
+
+    with app.app_context():
+        db.create_all()

022-burette/magnum_opus_iii/magnumopus/injection.py

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+from injector import Injector
+from quart.views import MethodViewType
+
+class ViewInjectorMeta(MethodViewType):
+    def get_injector(self):
+        return self.get_app().extensions['injector']
+
+    def __call__(cls, *args, **kwargs):
+        return cls.get_injector().create_object(
+            cls.__bases__[0],
+            additional_kwargs=kwargs
+        )
+
+def init_app(app, modules):
+    modules.append(configure_injector)
+
+    injctr = Injector()
+    for module in modules:
+        injctr.binder.install(module)
+    app.extensions['injector'] = injctr
+
+def configure_injector(binder):
+    """
+    Add any general purpose injectables, not included in a submodule
+    """
+    pass

022-burette/magnum_opus_iii/magnumopus/logger.py

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+import logging
+
+def init_app(app):
+    app.logger.addHandler(logging.StreamHandler())
+    app.logger.setLevel(logging.INFO)
+    return []

022-burette/magnum_opus_iii/magnumopus/models/__init__.py

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+from .base import db
+from flask_sqlalchemy import SQLAlchemy
+
+def init_app(app):
+    # db.init_app(app)
+    return [configure_injector]
+
+def configure_injector(binding):
+    binding.bind(
+        SQLAlchemy, to=db
+    )

022-burette/magnum_opus_iii/magnumopus/models/base.py

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+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()

022-burette/magnum_opus_iii/magnumopus/models/substance.py

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+from . import db
+from sqlalchemy_utils import ScalarListType
+
+class SubstanceMustBeFreshToProcessException(Exception):
+    pass
+
+class Substance(db.Model):
+    __tablename__ = 'substances'
+
+    id = db.Column(db.Integer, primary_key=True)
+    nature = db.Column(db.String(32), default='Unknown')
+    state = db.Column(ScalarListType())
+
+    def __init__(self, nature='Unknown'):
+        self.state = []
+        self.nature = nature
+
+        super(Substance, self).__init__()
+
+    def _process(self, process_name):
+        # Example of leakage of persistence behaviour into
+        # domain, due to db.Model -- we must copy the state list to
+        # ensure it is seen to change...
+        state = self.state[:]
+        state.append(process_name)
+        self.state = state
+
+        return self
+
+    def cook(self):
+        return self._process('cooked')
+
+    def pickle(self):
+        return self._process('pickled')
+
+    def ferment(self):
+        return self._process('fermented')
+
+    def wash(self):
+        return self._process('washed')

022-burette/magnum_opus_iii/magnumopus/repositories/__init__.py

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+from .pantry import Pantry
+from .list_pantry import ListPantry
+from .sqlalchemy_pantry import SQLAlchemyPantry
+
+PANTRY_STORES = {
+    'sqlalchemy': SQLAlchemyPantry,
+    'list': ListPantry()      # we instantiate this, as we want a singleton cupboard
+}
+
+def init_app(app):
+    return [lambda binder: configure_injector(binder, app)]
+
+def configure_injector(binder, app):
+    pantry_cls = PANTRY_STORES[app.config['PANTRY_STORE']]
+
+    binder.bind(
+        Pantry, to=pantry_cls
+    )

022-burette/magnum_opus_iii/magnumopus/repositories/list_pantry.py

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+class ListPantry:
+    def __init__(self):
+        self._cupboard = []
+
+    def empty_pantry(self):
+        self._cupboard = []
+
+    def add_substance(self, substance):
+        self._cupboard.append(substance)
+
+    def find_substances_by_nature(self, nature):
+        return [substance for substance in self._cupboard if substance.nature == nature]
+
+    def count_all_substances(self):
+        return len(self._cupboard)
+
+    def commit(self):
+        # Give each substance an ID, if it does not have one
+        free_ids = iter(
+            set(range(1, len(self._cupboard) + 1)) -
+            set([substance.id for substance in self._cupboard if substance])
+        )
+
+        for substance in self._cupboard:
+            if not substance.id:
+                substance.id = next(free_ids)

022-burette/magnum_opus_iii/magnumopus/repositories/pantry.py

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+from abc import ABC, abstractmethod
+
+class Pantry(ABC):
+    def __init__(self):
+        pass
+
+    @abstractmethod
+    def do_empty(self):
+        pass
+
+    @abstractmethod
+    def add_substance(self, substance):
+        pass
+
+    @abstractmethod
+    def find_substances_by_nature(self, nature):
+        pass
+
+    @abstractmethod
+    def count_all_substances(self):
+        pass
+
+    @abstractmethod
+    def commit(self):
+        pass