Dockerfile

+# Nix builder
+FROM nixos/nix:latest AS builder
+
+# Copy our source and setup our working dir.
+COPY . /tmp/build
+WORKDIR /tmp/build
+
+# Build our Nix environment
+RUN nix \
+    --extra-experimental-features "nix-command flakes" \
+    --option filter-syscalls false \
+    build
+
+# Copy the Nix store closure into a directory. The Nix store closure is the
+# entire set of Nix store values that we need for our build.
+RUN mkdir /tmp/nix-store-closure
+RUN cp -r $(nix-store -qR result/) /tmp/nix-store-closure
+
+# Final image is based on scratch. We copy a bunch of Nix dependencies
+# but they're fully self-contained so we don't need Nix anymore.
+FROM scratch
+
+WORKDIR /app
+
+# Copy /nix/store
+COPY --from=builder /tmp/nix-store-closure /nix/store
+COPY --from=builder /tmp/build/result /app
+CMD ["/app/bin/testdata"]

docker-compose.yaml

+services:
+  testdata:
+    image: result/latest
+
+    build:
+      dockerfile: ./Dockerfile
+
+    environment:
+          TESTDATA_HOST: 0.0.0.0
+          TESTDATA_PORT: 1234
+          TESTDATA_CONFIG: ./config.json
+    volumes:
+      - ./config.json:/app/config.json
+      - ./db.json:/app/db.json
+      - ./log.jsonl:/app/log.jsonl

flake.nix

@@ -61,17 +61,17 @@
           in ''
             ${
               if builtins.elem "pytest" dev && !skipCheck
-              then "pytest src tests"
+              then "pytest tests"
               else ""
             }
             ${
               if builtins.elem "mypy" dev && !skipCheck
-              then "mypy src tests"
+              then "mypy src"
               else ""
             }
             ${
               if builtins.elem "pylint" dev && !skipCheck
-              then "pylint src tests"
+              then "pylint src"
               else ""
             }
           '';

pyproject.toml

 [project]
 name = "testdata"
-version = "1.1.0"
+version = "1.2.1"
 requires-python = "~=3.12, <4"
 dependencies = [
-    "fastapi~=0.115.3",
-    "uvicorn~=0.32.0",
-    "pydantic~=2.9.2",
+    "fastapi~=0.115",
+    "uvicorn~=0.32",
+    "pydantic~=2.9",
 ]
 
 [project.optional-dependencies]
 dev = [
-    "pytest~=8.3.4",
-    "mypy~=1.13.0",
-    "pylint~=3.3.3",
-    "requests~=2.32.3",
-    "types-requests~=2.32.0"
+    "pytest~=8.3",
+    "mypy~=1.13",
+    "pylint~=3.3",
+    "requests~=2.32",
+    "types-requests~=2.32"
 ]
 
 [project.scripts]
 testdata = "testdata.main:main"
 
 [build-system]
-requires = ["setuptools~=75.1.1"]
+requires = ["setuptools~=75.1"]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools.packages.find]

src/testdata/logger/logger.py

@@ -132,7 +132,7 @@ def generate_log_config(log_path: str | None = None) -> dict:
                 'class': logging.handlers.RotatingFileHandler,
                 'level': 'DEBUG',
                 'formatter': 'json',
-                'filename': 'log.jsonl',
+                'filename': log_path,
                 'maxBytes': 1024 * 1024 * 10,  # 10 MiB
                 'backupCount': 3
         }} if log_path is not None else {}),

src/testdata/main.py

+import os
 import sys
 import argparse
 import asyncio
+import shutil
 
 from .testdata import Testdata
 
 def parse_args(args: list[str]):
-    parser = argparse.ArgumentParser()
-    parser.add_argument('-c', '--config', type=argparse.FileType('r'), default='./config.json', help='Path to config file in JSON format.')
-    parser.add_argument('-l', '--listen', type=str, default='0.0.0.0', help='IP on which to listen.')
-    parser.add_argument('-p', '--port', type=int, default='8080', help='Port on which to serve the webserver.')
+    def formatter(prog):
+        return argparse.ArgumentDefaultsHelpFormatter(prog, max_help_position=shutil.get_terminal_size().columns)
+
+    parser = argparse.ArgumentParser(formatter_class=formatter)
+
+    parser.add_argument(
+        '-c', '--config', type=argparse.FileType('r'),
+        default=os.environ['TESTDATA_CONFIG'] if 'TESTDATA_CONFIG' in os.environ else './config.json',
+        help='Path to config file in JSON format.'
+    )
+    parser.add_argument(
+        '-l', '--listen', type=str,
+        default=os.environ['TESTDATA_HOST'] if 'TESTDATA_HOST' in os.environ else '0.0.0.0',
+        help='IP on which to listen.'
+    )
+    parser.add_argument(
+        '-p', '--port', type=int,
+        default=os.environ['TESTDATA_PORT'] if 'TESTDATA_PORT' in os.environ else 8080,
+        help='Port on which to serve the webserver.'
+    )
 
     return parser.parse_args(args)
 

src/testdata/testdata.py

 import os
 import json
 import asyncio
+import inspect
+import functools
+import random
+import importlib.metadata
+from datetime import datetime
 
-from typing_extensions import Annotated
 import uvicorn
-from fastapi import FastAPI, Request, status, HTTPException
+from typing_extensions import Annotated
+from fastapi import FastAPI, Request, Security, status, HTTPException
+from fastapi.security import APIKeyHeader, APIKeyQuery
 from fastapi.responses import StreamingResponse
 from pydantic import BaseModel, ConfigDict, Field, BeforeValidator, ValidationError
 
@@ -49,28 +55,103 @@ class Testdata:
 
     _config: Config
     _api: FastAPI
-    _state: dict[str, int]
+    _state: dict
     _logger: logger.Logger
 
     def __init__(self, config: Config):
         self._config = config
-        self._api = FastAPI(docs_url=None, redoc_url=None)
         self._logger = logger.getLogger('testdata')
+        self._api = self._setup_api()
 
         # Store internal state
-        self._state = {'data-used': 0}
+        self._state = {
+            'version': importlib.metadata.version('testdata'),  # For future compatibility
+            'data-used': {f'{(today := datetime.today()).year}-{today.month:02}': 0}  # math each months data usage
+        }
 
-        @self._api.get('/zeros')
-        async def zeros(api_key: str, size: int | str, request: Request) -> StreamingResponse:
-            try:
-                extra = {'api_key': api_key, 'ip': request.client.host if request.client is not None else None, 'size': size}
-                self._logger.debug('Initiated request.', extra=extra)
+    def _setup_api(self) -> FastAPI:
+        api = FastAPI(docs_url='/', redoc_url=None)
+
+        # Security
+        def get_api_key(
+            api_key_query: str = Security(APIKeyQuery(name="api_key", auto_error=False)),
+            api_key_header: str = Security(APIKeyHeader(name="x-api-key", auto_error=False))
+        ) -> str:
+            # https://joshdimella.com/blog/adding-api-key-auth-to-fast-api
+
+            if api_key_query in self._config.authorized_keys:
+                return api_key_query
+            if api_key_header in self._config.authorized_keys:
+                return api_key_header
 
-                if api_key not in config.authorized_keys:
             raise HTTPException(
                 status_code=status.HTTP_401_UNAUTHORIZED,
-                        detail='Invalid API Key.'
+                detail='Invalid or missing API Key'
+            )
+
+        # A wrapper to set the function signature to accept the api key dependency
+        def secure(func):
+            # Get old signature
+            positional_only, positional_or_keyword, variadic_positional, keyword_only, variadic_keyword = [], [], [], [], []
+            for value in inspect.signature(func).parameters.values():
+                if value.kind == inspect.Parameter.POSITIONAL_ONLY:
+                    positional_only.append(value)
+                elif value.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD:
+                    positional_or_keyword.append(value)
+                elif value.kind == inspect.Parameter.VAR_POSITIONAL:
+                    variadic_positional.append(value)
+                elif value.kind == inspect.Parameter.KEYWORD_ONLY:
+                    keyword_only.append(value)
+                elif value.kind == inspect.Parameter.VAR_KEYWORD:
+                    variadic_keyword.append(value)
+
+            # Avoid passing an unrecognized keyword
+            if inspect.iscoroutinefunction(func):
+                async def wrapper(*args, **kwargs):
+                    if len(variadic_keyword) == 0:
+                        if 'api_key' in kwargs:
+                            del kwargs['api_key']
+
+                    return await func(*args, **kwargs)
+            else:
+                def wrapper(*args, **kwargs):
+                    if len(variadic_keyword) == 0:
+                        if 'api_key' in kwargs:
+                            del kwargs['api_key']
+
+                    return func(*args, **kwargs)
+
+            # Override signature
+            wrapper.__signature__ = inspect.signature(func).replace(
+                parameters=(
+                    *positional_only,
+                    *positional_or_keyword,
+                    *variadic_positional,
+                    *keyword_only,
+                    inspect.Parameter('api_key', inspect.Parameter.POSITIONAL_OR_KEYWORD, default=Security(get_api_key)),
+                    *variadic_keyword
+                )
             )
+
+            return functools.wraps(func)(wrapper)
+
+        # Routes
+        api.get('/zeros')(secure(self._zeros))
+
+        return api
+
+    async def _zeros(self, size: int | str, request: Request, filename: str = 'zeros.bin') -> StreamingResponse:
+        try:
+            extra = {'id': f'{random.randint(0, 2 ** 32 - 1):08X}'}
+            self._logger.debug(
+                'Initiated request.',
+                extra=extra | {
+                    'ip': request.client.host if request.client is not None else None,
+                    'query-params': dict(request.query_params),
+                    'headers': dict(request.headers)
+                }
+            )
+
             try:
                 size = convert_to_bytes(size)
             except ValueError as err:
@@ -82,24 +163,28 @@ class Testdata:
 
             if size < 0:
                 raise MinSizePerRequestError
-                if config.max_size < size:
+            if self._config.max_size < size:
                 raise MaxSizePerRequestError
 
             # update internal state
-                if config.max_data < self._state['data-used'] + size:
+            current_date = f'{(today := datetime.today()).year}-{today.month:02}'
+            if current_date not in self._state['data-used']:
+                self._state['data-used'][current_date] = 0
+            if self._config.max_data < self._state['data-used'][current_date] + size:
                 raise HTTPException(
                     status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                     detail='Service not available.'
                 )
-                self._state['data-used'] += size
+            self._state['data-used'][current_date] += size
 
             self._logger.debug('Successfully processed request.', extra=extra)
             return StreamingResponse(
                 status_code=status.HTTP_200_OK,
-                    content=generate_data(size, config.buffer_size),
+                content=generate_data(size, self._config.buffer_size),
                 media_type='application/octet-stream',
                 headers={
-                        'Content-Length': str(size)
+                    'Content-Length': str(size),
+                    'Content-Disposition': f'attachment; filename="{filename}"'
                 }
             )
 
@@ -113,13 +198,15 @@ class Testdata:
             self._logger.warning('Exceeded max size per request.', extra=extra)
             raise HTTPException(
                 status_code=status.HTTP_416_REQUESTED_RANGE_NOT_SATISFIABLE,
-                    detail=f'Exceeded max size per request of {config.max_size} Bytes.'
+                detail=f'Exceeded max size per request of {self._config.max_size} Bytes.'
             ) from err
         except Exception as err:
             self._logger.exception(err)
             raise err
 
-    async def _update_state(self):
+    async def _update_state(self) -> None:
+        assert self._config.database is not None
+
         mode = 'r+' if os.path.exists(self._config.database) else 'w+'
 
         with open(self._config.database, mode, encoding='utf-8') as file:
@@ -130,7 +217,7 @@ class Testdata:
 
             while True:
                 file.seek(0)
-                json.dump(self._state, file)
+                json.dump(self._state, file, indent=2)
                 file.truncate()
                 await asyncio.sleep(self._config.database_update_interval)
 
@@ -142,7 +229,7 @@ class Testdata:
             self._logger = logger.getLogger('testdata')
             self._logger.info('Server started.')
 
-            coroutines = [asyncio.create_task(uvicorn.Server(uvicorn.Config(self._api, host, port)).serve())]
+            coroutines = [uvicorn.Server(uvicorn.Config(self._api, host, port)).serve()]
             if self._config.database is not None:
                 coroutines.append(self._update_state())
 

tests/test_testdata.py

@@ -53,6 +53,17 @@ def _server(request) -> Generator[str, None, None]:
                 break
 
 
+@pytest.mark.parametrize('_server', [({
+    'keys': ['one', 'two', 'three'],
+    'max-size': '100',
+    'max-data': 1234,
+    'buffer-size': '12MiB',
+})], indirect=['_server'])
+def test_invalid_api_key(_server):
+    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=four&size=100', timeout=TIMEOUT)
+    assert response.status_code == 401
+
+
 @pytest.mark.parametrize('_server', [({
     'keys': ['one', 'two', 'three'],
     'max-size': '100',
@@ -85,13 +96,16 @@ def test_request_size_upper_bound(_server):
 
 @pytest.mark.parametrize('_server', [({
     'keys': ['one', 'two', 'three'],
-    'max-size': '100',
-    'max-data': 1234,
+    'max-size': '100KB',
+    'max-data': '100KB',
     'buffer-size': '12MiB',
 })], indirect=['_server'])
-def test_invalid_api_key(_server):
-    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=four&size=100', timeout=TIMEOUT)
-    assert response.status_code == 401
+def test_request_max_data_used(_server):
+    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=one&size=100KB', timeout=TIMEOUT)
+    assert response.status_code == 200
+
+    response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=one&size=1', timeout=TIMEOUT)
+    assert response.status_code == 500
 
 
 @pytest.mark.parametrize('_server', [({
@@ -102,15 +116,29 @@ def test_invalid_api_key(_server):
     'database-update-interval': 0.1
 })], indirect=['_server'])
 def test_check_database_update(_server):
+    import importlib.metadata
+    from datetime import datetime
+
     database = _server
 
     with open(database, 'r', encoding='utf-8') as file:
         file.seek(0)
-        assert json.load(file) == {'data-used': 0}
+        today = datetime.today()
+        assert json.load(file) == {
+            'version': importlib.metadata.version('testdata'),
+            'data-used': {
+                f'{today.year}-{today.month:02}': 0
+            }
+        }
 
         response = requests.get(f'{PROTOCOL}://{HOST}:{PORT}/zeros?api_key=one&size=100', timeout=TIMEOUT)
         assert response.status_code == 200
 
         time.sleep(0.1)
         file.seek(0)
-        assert json.load(file) == {'data-used': 100}
+        assert json.load(file) == {
+            'version': importlib.metadata.version('testdata'),
+            'data-used': {
+                f'{today.year}-{today.month:02}': 100
+            }
+        }