diagnostics_channel: early-exit tracing channel trace methods #51915
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There seem to be spurious changes to other files. Could you fix?
My 2 cents for this is that the data produced by a tracing channel that's not started at startup is useless because incomplete and it could lead to crashes/unexpected behaviors. A developer can always move the tracing setup at the beginning of the program and capture everything. I think this is a bugfix.
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Apologies for the formatting irregularities. I've been trying out Zed and it apparently likes to auto-format buffers not just when opening them, but also when they appear in search results. 😐 |
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| // While subscribe occurs _before_ the promise resolves, | ||
| // no async events should be published. | ||
| channel.tracePromise(() => { |
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| channel.tracePromise(() => { | |
| channel.tracePromise(common.mustCall(() => { |
You could even add asserts that this/arguments/return values are correctly forwarded.
Similar of the other APIs. But feel free to ignore and keep as is.
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I interpret this also as a bugfix. |
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PR-URL: nodejs#51915 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]> Reviewed-By: Chengzhong Wu <[email protected]>
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PR-URL: #51915 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]> Reviewed-By: Chengzhong Wu <[email protected]>
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| } | ||
| } | ||
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| get hasSubscribers() { |
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It looks like there are no tests for this method. Though it does get code coverage since it's used by other methods. Was that intentional? Seems like an accident since it's a public method. Also it looks like there's no documentation?
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follow up work for nodejs#51915
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- some `diagnostics_channel` changes landed in Node.js in nodejs/node#51915 - this PR adds the `TracingChannel#hasSubscribers` helper method available in Node.js v22 and v20.13 - this PR _does not_ add the early exit functionality from that same commit - since this PR only implements half of the functionality in that commit we aren't fully v22 and v20.13 compatible - for that reason I haven't updated the README to state that we track said versions - I did add a note to the README about this partial jump in functionality - this PR also adds CI tests against Node.js v22.x - partially obsoletes #10 which is a WIP that attempted to implement both
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PR-URL: nodejs#51915 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Gerhard Stöbich <[email protected]> Reviewed-By: Chengzhong Wu <[email protected]>
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follow up work for #51915 PR-URL: #52908 Reviewed-By: Stephen Belanger <[email protected]> Reviewed-By: James M Snell <[email protected]>
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This documents and enforces that tracing channel will not publish events unless subscribers are present at the start of the trace. This enables a more performant early exit and ensures graph completeness as prior to this change a subscription added midway through a trace could receive the later events despite missing the earlier ones.
I'm unsure if we should consider this a major change as there is a behaviour change in that a subscriber will no longer receive events for traces which began before the subscription was made. This could be considered a major change, or it could be considered a bug fix--we'll need to decide how we should frame this.
cc @nodejs/diagnostics