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from __future__ import annotations
from typing import TYPE_CHECKING, Literal
from litestar.enums import CompressionEncoding
from litestar.exceptions import MissingDependencyException
from litestar.middleware.compression.facade import CompressionFacade
try:
from brotli import MODE_FONT, MODE_GENERIC, MODE_TEXT, Compressor
except ImportError as e:
raise MissingDependencyException("brotli") from e
if TYPE_CHECKING:
from io import BytesIO
from litestar.config.compression import CompressionConfig
class BrotliCompression(CompressionFacade):
__slots__ = ("compressor", "buffer", "compression_encoding")
encoding = CompressionEncoding.BROTLI
def __init__(
self,
buffer: BytesIO,
compression_encoding: Literal[CompressionEncoding.BROTLI] | str,
config: CompressionConfig,
) -> None:
self.buffer = buffer
self.compression_encoding = compression_encoding
modes: dict[Literal["generic", "text", "font"], int] = {
"text": int(MODE_TEXT),
"font": int(MODE_FONT),
"generic": int(MODE_GENERIC),
}
self.compressor = Compressor(
quality=config.brotli_quality,
mode=modes[config.brotli_mode],
lgwin=config.brotli_lgwin,
lgblock=config.brotli_lgblock,
)
def write(self, body: bytes) -> None:
self.buffer.write(self.compressor.process(body))
self.buffer.write(self.compressor.flush())
def close(self) -> None:
self.buffer.write(self.compressor.finish())
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