test

.env-template

@@ -1,3 +1,6 @@
 NETADM_CONFIG__RUN__HOST = "0.0.0.0"
 NETADM_CONFIG__RUN__PORT = 8000
 NETADM_CONFIG__RUN__RELOAD = 1
+
+NETADM_CONFIG__DB__URL=postgresql+asyncpg://user:pwd@localhost:5432/app
+NETADM_CONFIG__DB__ECHO=1

alembic.ini

@@ -0,0 +1,115 @@
+# A generic, single database configuration.
+
+[alembic]
+# path to migration scripts.
+# Use forward slashes (/) also on windows to provide an os agnostic path
+script_location = alembic
+
+# template used to generate migration file names; The default value is %%(rev)s_%%(slug)s
+# Uncomment the line below if you want the files to be prepended with date and time
+file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(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>=3.9 or backports.zoneinfo library.
+# Any required deps can installed by adding `alembic[tz]` to the pip requirements
+# string value is passed to ZoneInfo()
+# 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" below.
+# 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. The default within new alembic.ini files is "os", which uses os.pathsep.
+# If this key is omitted entirely, it falls back to the legacy behavior of splitting on spaces and/or commas.
+# Valid values for version_path_separator are:
+#
+# version_path_separator = :
+# version_path_separator = ;
+# version_path_separator = space
+# version_path_separator = newline
+version_path_separator = os  # Use os.pathsep. Default configuration used for new projects.
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# new in Alembic version 1.10
+# recursive_version_locations = false
+
+# 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
+
+# lint with attempts to fix using "ruff" - use the exec runner, execute a binary
+# hooks = ruff
+# ruff.type = exec
+# ruff.executable = %(here)s/.venv/bin/ruff
+# ruff.options = --fix 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

alembic/README

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

alembic/env.py

@@ -0,0 +1,94 @@
+import asyncio
+from logging.config import fileConfig
+
+from sqlalchemy import pool
+from sqlalchemy.engine import Connection
+from sqlalchemy.ext.asyncio import async_engine_from_config
+
+from alembic import context
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+# from myapp import mymodel
+# target_metadata = mymodel.Base.metadata
+# target_metadata = None
+from models import Base
+
+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.
+from config import settings
+
+config.set_main_option("sqlalchemy.url", settings.db_url)
+
+
+def run_migrations_offline() -> None:
+    """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: Connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations() -> None:
+    """In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+
+    connectable = async_engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
+
+    await connectable.dispose()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+
+    asyncio.run(run_async_migrations())
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

config.py

@@ -3,7 +3,7 @@ from pydantic_settings import (
     BaseSettings,
     SettingsConfigDict,
 )
-
+from pydantic import PostgresDsn
 from pathlib import Path
 
 import logging
@@ -29,6 +29,22 @@ class SwaggerConfig(BaseModel):
     swagger_favicon_url: str = "/static/swagger/favicon.png"
 
 
+class DatabaseConfig(BaseModel):
+    url: PostgresDsn
+    echo: bool = False
+    echo_pool: bool = False
+    pool_size: int = 50
+    max_overflow: int = 10
+
+    naming_convention: dict[str, str] = {
+        "ix": "ix_%(column_0_label)s",
+        "uq": "uq_%(table_name)s_%(column_0_N_name)s",
+        "ck": "ck_%(table_name)s_%(constraint_name)s",
+        "fk": "fk_%(table_name)s_%(column_0_name)s_%(referred_table_name)s",
+        "pk": "pk_%(table_name)s",
+    }
+
+
 class Settings(BaseSettings):
     model_config = SettingsConfigDict(
         env_file=(
@@ -41,6 +57,7 @@ class Settings(BaseSettings):
     )
     run: RunConfig
     swagger: SwaggerConfig = SwaggerConfig()
+    db: DatabaseConfig
 
 
 settings = Settings()

main.py

@@ -1,4 +1,5 @@
 import logging
+from contextlib import asynccontextmanager
 from config import settings, STATIC_DIR
 import uvicorn
 from fastapi import FastAPI
@@ -6,15 +7,33 @@ from fastapi.responses import ORJSONResponse
 from starlette.staticfiles import StaticFiles
 from web.routers import router as web_router
 
+from models import db_helper
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # startup
+    yield
+    # shutdown
+    await db_helper.dispose()
+
+
 main_app = FastAPI(
     default_response_class=ORJSONResponse,
+    lifespan=lifespan,
     docs_url=None,
 )
 
-main_app.include_router(web_router)
+main_app.include_router(
+    web_router,
+)
 
 
-main_app.mount("/static", StaticFiles(directory=STATIC_DIR), name="static")
+main_app.mount(
+    "/static",
+    StaticFiles(directory=STATIC_DIR),
+    name="static",
+)
 
 
 if __name__ == "__main__":

models/__init__.py

@@ -0,0 +1,8 @@
+from .db_helper import db_helper
+from .base import Base
+
+
+__all__ = (
+    "db_helper",
+    "Base",
+)

models/base.py

@@ -0,0 +1,20 @@
+from sqlalchemy import MetaData
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm import Mapped
+from sqlalchemy.orm import mapped_column
+from sqlalchemy.orm import declared_attr
+
+from config import settings
+from utils import camel_case_to_snake_case
+
+
+class Base(DeclarativeBase):
+    __abstract__ = True
+
+    metadata = MetaData(
+        naming_convention=settings.db.naming_convention,
+    )
+
+    @declared_attr.directive
+    def __tablename__(cls) -> str:
+        return f"{camel_case_to_snake_case(cls.__name__)}s"

models/db_helper.py

@@ -0,0 +1,50 @@
+from typing import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import (
+    create_async_engine,
+    AsyncEngine,
+    async_sessionmaker,
+    AsyncSession,
+)
+
+from config import settings
+
+
+class DatabaseHelper:
+    def __init__(
+        self,
+        url: str,
+        echo: bool = False,
+        echo_pool: bool = False,
+        pool_size: int = 5,
+        max_overflow: int = 10,
+    ) -> None:
+        self.engine: AsyncEngine = create_async_engine(
+            url=url,
+            echo=echo,
+            echo_pool=echo_pool,
+            pool_size=pool_size,
+            max_overflow=max_overflow,
+        )
+        self.session_factory: async_sessionmaker[AsyncSession] = async_sessionmaker(
+            bind=self.engine,
+            autoflush=False,
+            autocommit=False,
+            expire_on_commit=False,
+        )
+
+    async def dispose(self) -> None:
+        await self.engine.dispose()
+
+    async def session_getter(self) -> AsyncGenerator[AsyncSession, None]:
+        async with self.session_factory() as session:
+            yield session
+
+
+db_helper = DatabaseHelper(
+    url=str(settings.db.url),
+    echo=settings.db.echo,
+    echo_pool=settings.db.echo_pool,
+    pool_size=settings.db.pool_size,
+    max_overflow=settings.db.max_overflow,
+)

models/mixins/id_int_pk.py

@@ -0,0 +1,6 @@
+from sqlalchemy.orm import Mapped
+from sqlalchemy.orm import mapped_column
+
+
+class IdIntPkMixin:
+    id: Mapped[int] = mapped_column(primary_key=True)

utils/__init__.py

@@ -0,0 +1,5 @@
+__all__ = (
+    "camel_case_to_snake_case",
+)
+
+from .case_converter import camel_case_to_snake_case

utils/case_converter.py

@@ -0,0 +1,29 @@
+"""
+Taken from
+https://github.com/mahenzon/ri-sdk-python-wrapper/blob/master/ri_sdk_codegen/utils/case_converter.py
+"""
+
+
+def camel_case_to_snake_case(input_str: str) -> str:
+    """
+    >>> camel_case_to_snake_case("SomeSDK")
+    'some_sdk'
+    >>> camel_case_to_snake_case("RServoDrive")
+    'r_servo_drive'
+    >>> camel_case_to_snake_case("SDKDemo")
+    'sdk_demo'
+    """
+    chars = []
+    for c_idx, char in enumerate(input_str):
+        if c_idx and char.isupper():
+            nxt_idx = c_idx + 1
+            # idea of the flag is to separate abbreviations
+            # as new words, show them in lower case
+            flag = nxt_idx >= len(input_str) or input_str[nxt_idx].isupper()
+            prev_char = input_str[c_idx - 1]
+            if prev_char.isupper() and flag:
+                pass
+            else:
+                chars.append("_")
+        chars.append(char.lower())
+    return "".join(chars)