Init

src/app/alembic.ini

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+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts
+script_location = ./app/alembic
+
+# 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 alembic/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:alembic/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
+
+
+[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

src/app/alembic/README

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+Generic single-database configuration.

src/app/alembic/env.py

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+from alembic import context
+import sys, os
+
+from sqlalchemy.engine import create_engine
+
+from core.db import DATABASE_URL
+
+
+myPath = os.path.dirname(os.path.abspath(__file__))
+sys.path.insert(0, myPath + '/../../')
+
+config = context.config
+
+
+from app.models import BaseMeta
+target_metadata = BaseMeta.metadata
+
+
+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 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 = create_engine(DATABASE_URL)
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata, compare_type=True
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

src/app/alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade():
+    ${downgrades if downgrades else "pass"}

src/app/alembic/versions/7e45f53febe1_.py

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+"""empty message
+
+Revision ID: 7e45f53febe1
+Revises: 
+Create Date: 2021-12-03 22:42:22.514771
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '7e45f53febe1'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('languages',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('label', sa.String(length=16), nullable=False),
+    sa.Column('code', sa.String(length=4), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('code')
+    )
+    op.create_table('user_settings',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('user_id', sa.BigInteger(), nullable=False),
+    sa.Column('last_name', sa.String(length=64), nullable=False),
+    sa.Column('first_name', sa.String(length=64), nullable=False),
+    sa.Column('username', sa.String(length=32), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('user_id')
+    )
+    op.create_table('users_languages',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('language', sa.Integer(), nullable=True),
+    sa.Column('user', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['language'], ['languages.id'], name='fk_users_languages_languages_language_id', onupdate='CASCADE', ondelete='CASCADE'),
+    sa.ForeignKeyConstraint(['user'], ['user_settings.id'], name='fk_users_languages_user_settings_user_id', onupdate='CASCADE', ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('users_languages')
+    op.drop_table('user_settings')
+    op.drop_table('languages')
+    # ### end Alembic commands ###

src/app/depends.py

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+from fastapi import Security, HTTPException, status
+
+from core.auth import default_security
+from core.config import env_config
+
+
+async def check_token(api_key: str = Security(default_security)):
+    if api_key != env_config.API_KEY:
+        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Wrong api key!")

src/app/models.py

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+import ormar
+
+from core.db import metadata, database
+
+
+class BaseMeta(ormar.ModelMeta):
+    metadata = metadata
+    database = database
+
+
+class Language(ormar.Model):
+    class Meta(BaseMeta):
+        tablename = "languages"
+
+    id: int = ormar.Integer(primary_key=True)  # type: ignore
+    label: str = ormar.String(max_length=16)  # type: ignore
+    code: str = ormar.String(max_length=4, unique=True)  # type: ignore
+
+
+class User(ormar.Model):
+    class Meta(BaseMeta):
+        tablename = "user_settings"
+    
+    id: int = ormar.Integer(primary_key=True)  # type: ignore
+
+    user_id: int = ormar.BigInteger(unique=True)  # type: ignore
+    last_name: str = ormar.String(max_length=64)  # type: ignore
+    first_name: str = ormar.String(max_length=64)  # type: ignore
+    username: str = ormar.String(max_length=32)  # type: ignore
+    source: str = ormar.String(max_length=32)  # type: ignore
+
+    allowed_langs = ormar.ManyToMany(Language)

src/app/serializers.py

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+from pydantic import BaseModel, constr
+
+
+class LanguageDetail(BaseModel):
+    id: int
+    label: constr(max_length=16)  # type: ignore
+    code: constr(max_length=4)  # type: ignore
+
+
+class UserBase(BaseModel):
+    user_id: int
+    last_name: constr(max_length=64)  # type: ignore
+    first_name: constr(max_length=64)  # type: ignore
+    username: constr(max_length=32)  # type: ignore
+
+
+class UserCreateOrUpdate(BaseModel):
+    allowed_langs: list[str]
+
+
+class UserDetail(UserCreateOrUpdate):
+    allowed_langs: list[LanguageDetail]

src/app/views.py

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+from fastapi import APIRouter, HTTPException, status
+
+from app.serializers import UserCreateOrUpdate, UserDetail, LanguageDetail
+from app.models import User, Language
+
+
+# TODO: add redis cache
+
+
+users_router = APIRouter(
+    prefix="/users",
+    tags=["users"]
+)
+
+
+@users_router.get("/", response_model=list[UserDetail])
+async def get_users():
+    return await User.objects.select_related("allowed_langs").all()
+
+
+@users_router.get("/{user_id}", response_model=UserDetail)
+async def get_user(user_id: int):
+    user_data = await User.objects.select_related("allowd_langs").get_or_none(user_id=user_id)
+
+    if user_data is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
+
+    return user_data
+
+
+@users_router.post("/{user_id}", response_model=UserDetail)
+async def get_or_update_user(user_id: int, data: UserCreateOrUpdate):
+    data_dict = data.dict()
+
+    user_data = await User.objects.select_related("allowed_langs").get_or_none(user_id=user_id)
+
+    allowed_langs = data_dict.pop("allowed_langs")
+
+    if user_data is None:
+        return User.objects.create(**data.dict())
+    else:
+        user_data.update_from_dict(data.dict())
+
+    user_data.allowed_langs.clear()
+
+    langs = await Language.objects.filter(code__in=allowed_langs).all()
+
+    for lang in langs:
+        await user_data.allowed_langs.add(lang)
+
+    return user_data
+
+
+languages_router = APIRouter(
+    prefix="/languages",
+    tags=["languages"]
+)
+
+
+@languages_router.get("/", response_model=list[LanguageDetail])
+async def get_languages():
+    return await Language.objects.all()
+
+
+@languages_router.get("/{code}", response_model=LanguageDetail)
+async def get_language(code: str):
+    language = await Language.objects.get_or_none(code=code)
+
+    if language is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
+    
+    return language

src/core/app.py

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+from fastapi import FastAPI
+
+from core.db import database
+from app.views import users_router, languages_router
+
+
+def start_app() -> FastAPI:
+    app = FastAPI()
+
+    app.include_router(users_router)
+    app.include_router(languages_router)
+
+    app.state.database = database
+
+    @app.on_event('startup')
+    async def startup() -> None:
+        database_ = app.state.database
+        if not database_.is_connected:
+            await database_.connect()
+
+    @app.on_event('shutdown')
+    async def shutdown() -> None:
+        database_ = app.state.database
+        if database_.is_connected:
+            await database_.disconnect()
+
+    return app

src/core/auth.py

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+from fastapi.security import APIKeyHeader
+
+
+default_security = APIKeyHeader(name="Authorization")

src/core/config.py

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+from pydantic import BaseSettings
+
+
+class EnvConfig(BaseSettings):
+    API_KEY: str
+
+    POSTGRES_USER: str
+    POSTGRES_PASSWORD: str
+    POSTGRES_HOST: str
+    POSTGRES_PORT: int
+    POSTGRES_DB: str
+
+
+env_config = EnvConfig()

src/core/db.py

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+from urllib.parse import quote
+from databases import Database
+
+from sqlalchemy import MetaData
+
+from core.config import env_config
+
+
+DATABASE_URL = (
+    f"postgresql://{env_config.POSTGRES_USER}:{quote(env_config.POSTGRES_PASSWORD)}@"
+    f"{env_config.POSTGRES_HOST}:{env_config.POSTGRES_PORT}/{env_config.POSTGRES_DB}"
+)
+
+metadata = MetaData()
+database = Database(DATABASE_URL)

src/main.py

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+from core.app import start_app
+
+
+app = start_app()