mirror of
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255 lines
8.0 KiB
Python
255 lines
8.0 KiB
Python
from abc import ABCMeta, abstractmethod
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from itertools import chain
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from typing import Callable, Iterable, Optional, Union
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from .processing import Conversion, Formatting
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from ..context import Environment
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from ..encoding import smart_decode, smart_encode, UTF8
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from ..models import HTTPMessage, OutputOptions
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from ..utils import parse_content_type_header
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BINARY_SUPPRESSED_NOTICE = (
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b'\n'
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b'+-----------------------------------------+\n'
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b'| NOTE: binary data not shown in terminal |\n'
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b'+-----------------------------------------+'
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)
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class DataSuppressedError(Exception):
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message = None
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class BinarySuppressedError(DataSuppressedError):
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"""An error indicating that the body is binary and won't be written,
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e.g., for terminal output)."""
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message = BINARY_SUPPRESSED_NOTICE
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class BaseStream(metaclass=ABCMeta):
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"""Base HTTP message output stream class."""
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def __init__(
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self,
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msg: HTTPMessage,
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output_options: OutputOptions,
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on_body_chunk_downloaded: Callable[[bytes], None] = None,
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**kwargs
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):
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"""
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:param msg: a :class:`models.HTTPMessage` subclass
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:param output_options: a :class:`OutputOptions` instance to represent
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which parts of the message is printed.
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"""
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assert output_options.any()
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self.msg = msg
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self.output_options = output_options
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self.on_body_chunk_downloaded = on_body_chunk_downloaded
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self.extra_options = kwargs
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def get_headers(self) -> bytes:
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"""Return the headers' bytes."""
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return self.msg.headers.encode()
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def get_metadata(self) -> bytes:
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"""Return the message metadata."""
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return self.msg.metadata.encode()
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@abstractmethod
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def iter_body(self) -> Iterable[bytes]:
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"""Return an iterator over the message body."""
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def __iter__(self) -> Iterable[bytes]:
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"""Return an iterator over `self.msg`."""
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if self.output_options.headers:
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yield self.get_headers()
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yield b'\r\n\r\n'
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if self.output_options.body:
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try:
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for chunk in self.iter_body():
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yield chunk
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if self.on_body_chunk_downloaded:
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self.on_body_chunk_downloaded(chunk)
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except DataSuppressedError as e:
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if self.output_options.headers:
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yield b'\n'
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yield e.message
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if self.output_options.meta:
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if self.output_options.body:
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yield b'\n\n'
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yield self.get_metadata()
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yield b'\n\n'
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class RawStream(BaseStream):
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"""The message is streamed in chunks with no processing."""
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CHUNK_SIZE = 1024 * 100
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CHUNK_SIZE_BY_LINE = 1
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def __init__(self, chunk_size=CHUNK_SIZE, **kwargs):
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super().__init__(**kwargs)
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self.chunk_size = chunk_size
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def iter_body(self) -> Iterable[bytes]:
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return self.msg.iter_body(self.chunk_size)
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ENCODING_GUESS_THRESHOLD = 3
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class EncodedStream(BaseStream):
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"""Encoded HTTP message stream.
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The message bytes are converted to an encoding suitable for
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`self.env.stdout`. Unicode errors are replaced and binary data
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is suppressed. The body is always streamed by line.
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"""
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CHUNK_SIZE = 1
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def __init__(
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self,
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env=Environment(),
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mime_overwrite: str = None,
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encoding_overwrite: str = None,
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**kwargs
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):
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super().__init__(**kwargs)
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if mime_overwrite:
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self.mime = mime_overwrite
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else:
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self.mime, _ = parse_content_type_header(self.msg.content_type)
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self._encoding = encoding_overwrite or self.msg.encoding
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self._encoding_guesses = []
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if env.stdout_isatty:
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# Use the encoding supported by the terminal.
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output_encoding = env.stdout_encoding
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else:
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# Preserve the message encoding.
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output_encoding = self.msg.encoding
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# Default to UTF-8 when unsure.
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self.output_encoding = output_encoding or UTF8
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def iter_body(self) -> Iterable[bytes]:
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for line, lf in self.msg.iter_lines(self.CHUNK_SIZE):
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if b'\0' in line:
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raise BinarySuppressedError()
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line = self.decode_chunk(line)
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yield smart_encode(line, self.output_encoding) + lf
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def decode_chunk(self, raw_chunk: str) -> str:
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chunk, guessed_encoding = smart_decode(raw_chunk, self.encoding)
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self._encoding_guesses.append(guessed_encoding)
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return chunk
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@property
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def encoding(self) -> Optional[str]:
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if self._encoding:
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return self._encoding
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# If we find a reliable (used consecutively) encoding, than
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# use it for the next iterations.
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if len(self._encoding_guesses) < ENCODING_GUESS_THRESHOLD:
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return None
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guess_1, guess_2 = self._encoding_guesses[-2:]
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if guess_1 == guess_2:
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self._encoding = guess_1
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return guess_1
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@encoding.setter
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def encoding(self, value) -> None:
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self._encoding = value
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class PrettyStream(EncodedStream):
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"""In addition to :class:`EncodedStream` behaviour, this stream applies
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content processing.
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Useful for long-lived HTTP responses that stream by lines
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such as the Twitter streaming API.
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"""
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CHUNK_SIZE = 1
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def __init__(
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self, conversion: Conversion,
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formatting: Formatting,
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**kwargs,
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):
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super().__init__(**kwargs)
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self.formatting = formatting
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self.conversion = conversion
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def get_headers(self) -> bytes:
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return self.formatting.format_headers(
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self.msg.headers).encode(self.output_encoding)
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def get_metadata(self) -> bytes:
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return self.formatting.format_metadata(
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self.msg.metadata).encode(self.output_encoding)
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def iter_body(self) -> Iterable[bytes]:
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first_chunk = True
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iter_lines = self.msg.iter_lines(self.CHUNK_SIZE)
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for line, lf in iter_lines:
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if b'\0' in line:
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if first_chunk:
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converter = self.conversion.get_converter(self.mime)
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if converter:
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body = bytearray()
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# noinspection PyAssignmentToLoopOrWithParameter
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for line, lf in chain([(line, lf)], iter_lines):
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body.extend(line)
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body.extend(lf)
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self.mime, body = converter.convert(body)
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assert isinstance(body, str)
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yield self.process_body(body)
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return
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raise BinarySuppressedError()
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yield self.process_body(line) + lf
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first_chunk = False
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def process_body(self, chunk: Union[str, bytes]) -> bytes:
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if not isinstance(chunk, str):
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# Text when a converter has been used,
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# otherwise it will always be bytes.
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chunk = self.decode_chunk(chunk)
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chunk = self.formatting.format_body(content=chunk, mime=self.mime)
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return smart_encode(chunk, self.output_encoding)
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class BufferedPrettyStream(PrettyStream):
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"""The same as :class:`PrettyStream` except that the body is fully
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fetched before it's processed.
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Suitable regular HTTP responses.
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"""
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CHUNK_SIZE = 1024 * 10
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def iter_body(self) -> Iterable[bytes]:
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# Read the whole body before prettifying it,
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# but bail out immediately if the body is binary.
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converter = None
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body = bytearray()
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for chunk in self.msg.iter_body(self.CHUNK_SIZE):
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if not converter and b'\0' in chunk:
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converter = self.conversion.get_converter(self.mime)
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if not converter:
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raise BinarySuppressedError()
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body.extend(chunk)
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if converter:
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self.mime, body = converter.convert(body)
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yield self.process_body(body)
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