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Implement cancellation chain tracker #8
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* TODO: trim the history to prevent memory leak * TODO: add a command to show cancellation chain
- The memory leaked by `myself = asyncio.current_task()` in the coroutine wrapper. - Also use the weak value for task creation chains to ensure gc target tasks.
* Rename ls-terminated to ps-terminated for consistency
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* Add optional task creation stack chains to 'where' command (achimnol#1) * feat: Rewrite ps command to provide more concise view (achimnol#2) * feature: print numbers of total tasks when executing `ps` (achimnol#3) * Adopt `prompt_toolkit` and support concurrent clients (achimnol#4) * feat: Migrate to Click-based command line interface (achimnol#5) * fix: Reimplement console command (achimnol#6) * Support auto-completion of commands and arguments (achimnol#7) * Implement cancellation chain tracker (achimnol#8) * New commands: - `ps-terminated` (`pt`, `pst`) - `where-termianted` (`wt`) * New options: - `ps`, `pt`: `-f`, `--filter` to search task logs by their names and coroutine summary strings - `aiomonitor.Monitor` now has the history limit option (default: 1000) * Selective persistent termination logs (achimnol#9) - We should preserve the termination log of tasks that are supposed to be long-running and not terminated during the entire application lifecycle (e.g., server apps), when there are many volatile tasks continuously spawned and destroyed, regardless of the history limit. * fix: Support passing `name` and `context` kwarg to `create_task()` (achimnol#10) * fix: Regression in Python 3.10 due to achimnol#10 (achimnol#11) --------- Co-authored-by: Kyujin Cho <thy2134@me.com>
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This will allow diagnose the reason why some tasks are silently cancelled or terminated in live servers.