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Replace link to Requests documentation (#3125)
[etc/vim.git] / src / blackd / __init__.py
1 import asyncio
2 import logging
3 from concurrent.futures import Executor, ProcessPoolExecutor
4 from datetime import datetime
5 from functools import partial
6 from multiprocessing import freeze_support
7 from typing import Set, Tuple
8
9 try:
10     from aiohttp import web
11     from .middlewares import cors
12 except ImportError as ie:
13     raise ImportError(
14         f"aiohttp dependency is not installed: {ie}. "
15         + "Please re-install black with the '[d]' extra install "
16         + "to obtain aiohttp_cors: `pip install black[d]`"
17     ) from None
18
19 import black
20 from black.concurrency import maybe_install_uvloop
21 import click
22
23 from _black_version import version as __version__
24
25 # This is used internally by tests to shut down the server prematurely
26 _stop_signal = asyncio.Event()
27
28 # Request headers
29 PROTOCOL_VERSION_HEADER = "X-Protocol-Version"
30 LINE_LENGTH_HEADER = "X-Line-Length"
31 PYTHON_VARIANT_HEADER = "X-Python-Variant"
32 SKIP_STRING_NORMALIZATION_HEADER = "X-Skip-String-Normalization"
33 SKIP_MAGIC_TRAILING_COMMA = "X-Skip-Magic-Trailing-Comma"
34 FAST_OR_SAFE_HEADER = "X-Fast-Or-Safe"
35 DIFF_HEADER = "X-Diff"
36
37 BLACK_HEADERS = [
38     PROTOCOL_VERSION_HEADER,
39     LINE_LENGTH_HEADER,
40     PYTHON_VARIANT_HEADER,
41     SKIP_STRING_NORMALIZATION_HEADER,
42     SKIP_MAGIC_TRAILING_COMMA,
43     FAST_OR_SAFE_HEADER,
44     DIFF_HEADER,
45 ]
46
47 # Response headers
48 BLACK_VERSION_HEADER = "X-Black-Version"
49
50
51 class InvalidVariantHeader(Exception):
52     pass
53
54
55 @click.command(context_settings={"help_option_names": ["-h", "--help"]})
56 @click.option(
57     "--bind-host", type=str, help="Address to bind the server to.", default="localhost"
58 )
59 @click.option("--bind-port", type=int, help="Port to listen on", default=45484)
60 @click.version_option(version=black.__version__)
61 def main(bind_host: str, bind_port: int) -> None:
62     logging.basicConfig(level=logging.INFO)
63     app = make_app()
64     ver = black.__version__
65     black.out(f"blackd version {ver} listening on {bind_host} port {bind_port}")
66     web.run_app(app, host=bind_host, port=bind_port, handle_signals=True, print=None)
67
68
69 def make_app() -> web.Application:
70     app = web.Application(
71         middlewares=[cors(allow_headers=(*BLACK_HEADERS, "Content-Type"))]
72     )
73     executor = ProcessPoolExecutor()
74     app.add_routes([web.post("/", partial(handle, executor=executor))])
75     return app
76
77
78 async def handle(request: web.Request, executor: Executor) -> web.Response:
79     headers = {BLACK_VERSION_HEADER: __version__}
80     try:
81         if request.headers.get(PROTOCOL_VERSION_HEADER, "1") != "1":
82             return web.Response(
83                 status=501, text="This server only supports protocol version 1"
84             )
85         try:
86             line_length = int(
87                 request.headers.get(LINE_LENGTH_HEADER, black.DEFAULT_LINE_LENGTH)
88             )
89         except ValueError:
90             return web.Response(status=400, text="Invalid line length header value")
91
92         if PYTHON_VARIANT_HEADER in request.headers:
93             value = request.headers[PYTHON_VARIANT_HEADER]
94             try:
95                 pyi, versions = parse_python_variant_header(value)
96             except InvalidVariantHeader as e:
97                 return web.Response(
98                     status=400,
99                     text=f"Invalid value for {PYTHON_VARIANT_HEADER}: {e.args[0]}",
100                 )
101         else:
102             pyi = False
103             versions = set()
104
105         skip_string_normalization = bool(
106             request.headers.get(SKIP_STRING_NORMALIZATION_HEADER, False)
107         )
108         skip_magic_trailing_comma = bool(
109             request.headers.get(SKIP_MAGIC_TRAILING_COMMA, False)
110         )
111         fast = False
112         if request.headers.get(FAST_OR_SAFE_HEADER, "safe") == "fast":
113             fast = True
114         mode = black.FileMode(
115             target_versions=versions,
116             is_pyi=pyi,
117             line_length=line_length,
118             string_normalization=not skip_string_normalization,
119             magic_trailing_comma=not skip_magic_trailing_comma,
120         )
121         req_bytes = await request.content.read()
122         charset = request.charset if request.charset is not None else "utf8"
123         req_str = req_bytes.decode(charset)
124         then = datetime.utcnow()
125
126         loop = asyncio.get_event_loop()
127         formatted_str = await loop.run_in_executor(
128             executor, partial(black.format_file_contents, req_str, fast=fast, mode=mode)
129         )
130
131         # Only output the diff in the HTTP response
132         only_diff = bool(request.headers.get(DIFF_HEADER, False))
133         if only_diff:
134             now = datetime.utcnow()
135             src_name = f"In\t{then} +0000"
136             dst_name = f"Out\t{now} +0000"
137             loop = asyncio.get_event_loop()
138             formatted_str = await loop.run_in_executor(
139                 executor,
140                 partial(black.diff, req_str, formatted_str, src_name, dst_name),
141             )
142
143         return web.Response(
144             content_type=request.content_type,
145             charset=charset,
146             headers=headers,
147             text=formatted_str,
148         )
149     except black.NothingChanged:
150         return web.Response(status=204, headers=headers)
151     except black.InvalidInput as e:
152         return web.Response(status=400, headers=headers, text=str(e))
153     except Exception as e:
154         logging.exception("Exception during handling a request")
155         return web.Response(status=500, headers=headers, text=str(e))
156
157
158 def parse_python_variant_header(value: str) -> Tuple[bool, Set[black.TargetVersion]]:
159     if value == "pyi":
160         return True, set()
161     else:
162         versions = set()
163         for version in value.split(","):
164             if version.startswith("py"):
165                 version = version[len("py") :]
166             if "." in version:
167                 major_str, *rest = version.split(".")
168             else:
169                 major_str = version[0]
170                 rest = [version[1:]] if len(version) > 1 else []
171             try:
172                 major = int(major_str)
173                 if major not in (2, 3):
174                     raise InvalidVariantHeader("major version must be 2 or 3")
175                 if len(rest) > 0:
176                     minor = int(rest[0])
177                     if major == 2:
178                         raise InvalidVariantHeader("Python 2 is not supported")
179                 else:
180                     # Default to lowest supported minor version.
181                     minor = 7 if major == 2 else 3
182                 version_str = f"PY{major}{minor}"
183                 if major == 3 and not hasattr(black.TargetVersion, version_str):
184                     raise InvalidVariantHeader(f"3.{minor} is not supported")
185                 versions.add(black.TargetVersion[version_str])
186             except (KeyError, ValueError):
187                 raise InvalidVariantHeader("expected e.g. '3.7', 'py3.5'") from None
188         return False, versions
189
190
191 def patched_main() -> None:
192     maybe_install_uvloop()
193     freeze_support()
194     black.patch_click()
195     main()
196
197
198 if __name__ == "__main__":
199     patched_main()