| 205 | |
| 206 | |
| 207 | class _SendfileFallbackProtocol(protocols.Protocol): |
| 208 | def __init__(self, transp): |
| 209 | if not isinstance(transp, transports._FlowControlMixin): |
| 210 | raise TypeError("transport should be _FlowControlMixin instance") |
| 211 | self._transport = transp |
| 212 | self._proto = transp.get_protocol() |
| 213 | self._should_resume_reading = transp.is_reading() |
| 214 | self._should_resume_writing = transp._protocol_paused |
| 215 | transp.pause_reading() |
| 216 | transp.set_protocol(self) |
| 217 | if self._should_resume_writing: |
| 218 | self._write_ready_fut = self._transport._loop.create_future() |
| 219 | else: |
| 220 | self._write_ready_fut = None |
| 221 | |
| 222 | async def drain(self): |
| 223 | if self._transport.is_closing(): |
| 224 | raise ConnectionError("Connection closed by peer") |
| 225 | fut = self._write_ready_fut |
| 226 | if fut is None: |
| 227 | return |
| 228 | await fut |
| 229 | |
| 230 | def connection_made(self, transport): |
| 231 | raise RuntimeError("Invalid state: " |
| 232 | "connection should have been established already.") |
| 233 | |
| 234 | def connection_lost(self, exc): |
| 235 | if self._write_ready_fut is not None: |
| 236 | # Never happens if peer disconnects after sending the whole content |
| 237 | # Thus disconnection is always an exception from user perspective |
| 238 | if exc is None: |
| 239 | self._write_ready_fut.set_exception( |
| 240 | ConnectionError("Connection is closed by peer")) |
| 241 | else: |
| 242 | self._write_ready_fut.set_exception(exc) |
| 243 | self._proto.connection_lost(exc) |
| 244 | |
| 245 | def pause_writing(self): |
| 246 | if self._write_ready_fut is not None: |
| 247 | return |
| 248 | self._write_ready_fut = self._transport._loop.create_future() |
| 249 | |
| 250 | def resume_writing(self): |
| 251 | if self._write_ready_fut is None: |
| 252 | return |
| 253 | self._write_ready_fut.set_result(False) |
| 254 | self._write_ready_fut = None |
| 255 | |
| 256 | def data_received(self, data): |
| 257 | raise RuntimeError("Invalid state: reading should be paused") |
| 258 | |
| 259 | def eof_received(self): |
| 260 | raise RuntimeError("Invalid state: reading should be paused") |
| 261 | |
| 262 | async def restore(self): |
| 263 | self._transport.set_protocol(self._proto) |
| 264 | if self._should_resume_reading: |