Handle signals.
(self, sig, frame)
| 278 | signal.signal(signal.SIGTTOU, self._signal_handler) |
| 279 | |
| 280 | def _signal_handler(self, sig, frame): |
| 281 | """Handle signals.""" |
| 282 | if sig == signal.SIGCHLD: |
| 283 | # Child exited - will be handled in reap_workers |
| 284 | if self._loop: |
| 285 | self._loop.call_soon_threadsafe( |
| 286 | lambda: asyncio.create_task(self._handle_sigchld()) |
| 287 | ) |
| 288 | return |
| 289 | |
| 290 | if sig == signal.SIGUSR1: |
| 291 | # Reopen log files |
| 292 | self.log.reopen_files() |
| 293 | return |
| 294 | |
| 295 | if sig == signal.SIGHUP: |
| 296 | # Reload workers |
| 297 | if self._loop: |
| 298 | self._loop.call_soon_threadsafe( |
| 299 | lambda: asyncio.create_task(self.reload()) |
| 300 | ) |
| 301 | return |
| 302 | |
| 303 | if sig == signal.SIGTTIN: |
| 304 | # Increase number of workers |
| 305 | self.num_workers += 1 |
| 306 | self.log.info("SIGTTIN: Increasing dirty workers to %s", |
| 307 | self.num_workers) |
| 308 | if self._loop: |
| 309 | self._loop.call_soon_threadsafe( |
| 310 | lambda: asyncio.create_task(self.manage_workers()) |
| 311 | ) |
| 312 | return |
| 313 | |
| 314 | if sig == signal.SIGTTOU: |
| 315 | # Decrease number of workers (respecting minimum) |
| 316 | min_workers = self._get_minimum_workers() |
| 317 | if self.num_workers <= min_workers: |
| 318 | self.log.warning( |
| 319 | "SIGTTOU: Cannot decrease below %s workers " |
| 320 | "(required by app specs)", |
| 321 | min_workers |
| 322 | ) |
| 323 | return |
| 324 | self.num_workers -= 1 |
| 325 | self.log.info("SIGTTOU: Decreasing dirty workers to %s", |
| 326 | self.num_workers) |
| 327 | if self._loop: |
| 328 | self._loop.call_soon_threadsafe( |
| 329 | lambda: asyncio.create_task(self.manage_workers()) |
| 330 | ) |
| 331 | return |
| 332 | |
| 333 | # Shutdown signals |
| 334 | self.alive = False |
| 335 | if self._loop: |
| 336 | self._loop.call_soon_threadsafe(self._shutdown) |
| 337 |