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time: add track_caller to public APIs #4791
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Functions that may panic can be annotated with #[track_caller] so that in the event of a panic, the function where the user called the panicking function is shown instead of the file and line within Tokio source. This change adds #[track_caller] to all the non-unstable public APIs in tokio-util where the documentation describes how the function may panic due to incorrect context or inputs. In cases where `#[track_caller]` does not work, it has been left out. For example, it currently does not work on async functions, blocks, or closures. So any call stack that passes through one of these before reaching the actual panic is not able to show the calling site outside of tokio as the panic location. The public functions that could not have `#[track_caller]` added for this reason are: * `time::advance` Tests are included to cover each potentially panicking function. In the following cases, `#[track_caller]` had already been added, and only tests have been added: * `time::interval` * `time::interval_at` Refs: tokio-rs#4413
Darksonn
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Jun 27, 2022
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Thanks.
crapStone
pushed a commit
to Calciumdibromid/CaBr2
that referenced
this pull request
Jul 18, 2022
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dependencies | minor | `1.19.2` -> `1.20.0` | | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dev-dependencies | minor | `1.19.2` -> `1.20.0` | --- ### Release Notes <details> <summary>tokio-rs/tokio</summary> ### [`v1.20.0`](https://github.com/tokio-rs/tokio/releases/tag/tokio-1.20.0) [Compare Source](tokio-rs/tokio@tokio-1.19.2...tokio-1.20.0) ##### 1.20.0 (July 12, 2022) ##### Added - tokio: add track_caller to public APIs ([#​4772], [#​4791], [#​4793], [#​4806], [#​4808]) - sync: Add `has_changed` method to `watch::Ref` ([#​4758]) ##### Changed - time: remove `src/time/driver/wheel/stack.rs` ([#​4766]) - rt: clean up arguments passed to basic scheduler ([#​4767]) - net: be more specific about winapi features ([#​4764]) - tokio: use const initialized thread locals where possible ([#​4677]) - task: various small improvements to LocalKey ([#​4795]) ##### Fixed ##### Documented - fs: warn about performance pitfall ([#​4762]) - chore: fix spelling ([#​4769]) - sync: document spurious failures in oneshot ([#​4777]) - sync: add warning for watch in non-Send futures ([#​4741]) - chore: fix typo ([#​4798]) ##### Unstable - joinset: rename `join_one` to `join_next` ([#​4755]) - rt: unhandled panic config for current thread rt ([#​4770]) [#​4677]: tokio-rs/tokio#4677 [#​4741]: tokio-rs/tokio#4741 [#​4755]: tokio-rs/tokio#4755 [#​4758]: tokio-rs/tokio#4758 [#​4762]: tokio-rs/tokio#4762 [#​4764]: tokio-rs/tokio#4764 [#​4766]: tokio-rs/tokio#4766 [#​4767]: tokio-rs/tokio#4767 [#​4769]: tokio-rs/tokio#4769 [#​4770]: tokio-rs/tokio#4770 [#​4772]: tokio-rs/tokio#4772 [#​4777]: tokio-rs/tokio#4777 [#​4791]: tokio-rs/tokio#4791 [#​4793]: tokio-rs/tokio#4793 [#​4795]: tokio-rs/tokio#4795 [#​4798]: tokio-rs/tokio#4798 [#​4806]: tokio-rs/tokio#4806 [#​4808]: tokio-rs/tokio#4808 </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox. --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4xMTEuMSIsInVwZGF0ZWRJblZlciI6IjMyLjExMS4xIn0=--> Co-authored-by: cabr2-bot <cabr2.help@gmail.com> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1458 Reviewed-by: crapStone <crapstone@noreply.codeberg.org> Co-authored-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org> Co-committed-by: Calciumdibromid Bot <cabr2_bot@noreply.codeberg.org>
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Motivation
When a user of tokio calls a function that panics when misused (e.g. calling
time::interval
with 0 duration) then the user currently sees the line numberof the panic call inside tokio. It would be more informative for the user to see
the place where they called the panicking function.
It is still possible for the user to see the full stack trace by setting the
environment variable RUST_BACKLOG=1, so no useful information is
hidden.
This change is the 4th in a series towards closing #4413 (starting with #4772),
this change is for the time functions in the main
tokio
crate.Solution
Functions that may panic can be annotated with #[track_caller] so that
in the event of a panic, the function where the user called the
panicking function is shown instead of the file and line within Tokio
source.
This change adds #[track_caller] to all the non-unstable public APIs in
tokio-util where the documentation describes how the function may panic
due to incorrect context or inputs.
In cases where
#[track_caller]
does not work, it has been left out. Forexample, it currently does not work on async functions, blocks, or
closures. So any call stack that passes through one of these before
reaching the actual panic is not able to show the calling site outside
of tokio as the panic location.
The public functions that could not have
#[track_caller]
added forthis reason are:
time::advance
Tests are included to cover each potentially panicking function. In the
following cases,
#[track_caller]
had already been added, and onlytests have been added:
time::interval
time::interval_at
Refs: #4413