feat(llc)!: rework attachment uploads around AttachmentUploadTask - #170
feat(llc)!: rework attachment uploads around AttachmentUploadTask#170xsahil03x wants to merge 31 commits into
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📝 WalkthroughWalkthroughThe attachment upload API now returns task and batch objects. New lifecycle states provide byte-based progress, cancellation, normalized failures, concurrency control, and ordered batch results. ChangesAttachment upload rework
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR adds task-based and batch upload lifecycles, but the current implementation still has a test-compilation failure and can expose mutable completed results or report upload progress as complete too early. These issues should be fixed before merging. Sequence Diagram(s)sequenceDiagram
participant Caller
participant StreamAttachmentUploader
participant AttachmentUploadTaskImpl
participant CdnClient
Caller->>StreamAttachmentUploader: upload(attachment)
StreamAttachmentUploader->>AttachmentUploadTaskImpl: create and start task
AttachmentUploadTaskImpl->>CdnClient: upload image or file
CdnClient-->>AttachmentUploadTaskImpl: progress or result
AttachmentUploadTaskImpl-->>Caller: state updates and settled result
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## feat/error-layer #170 +/- ##
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An upload is not a request-response call: it has a lifecycle worth watching, it can be called off, and it has an outcome to wait for. All three now live on one object rather than being spread across a future, a progress callback and a cancellation token. `upload` returns an `AttachmentUploadTask`, whose `state` carries the whole lifecycle including byte progress, whose `result` settles exactly once and never throws, and which `cancel` calls off. `uploadBatch` returns an `AttachmentUploadBatch` that orchestrates those same tasks under a concurrency limit, aggregates byte-weighted progress, and finishes as a sealed `BatchUploadResult` carrying one outcome per attachment in input order. `CancelToken` and progress callbacks are gone from the public API, so the transport stays an implementation detail. `StreamAttachment.uploadState` is gone too: where an upload has got to belongs to the task running it, not to the model. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Inline comments:
In
`@packages/stream_core/lib/src/attachment/uploader/attachment_upload_batch.dart`:
- Around line 255-258: Update the batch item construction in the settlement flow
to wrap the generated items list with List.unmodifiable before storing it in the
terminal state and returning it, preserving the existing attachment order and
one-result-per-task mapping.
In
`@packages/stream_core/lib/src/attachment/uploader/attachment_upload_task.dart`:
- Line 150: Update the onProgress callback in AttachmentUploadTaskImpl._run to
normalize transport progress into attachment-byte progress when the attachment
size is known: scale sent by the attachment size divided by the transport total
before passing it to _trackProgress. Preserve the existing transport sent and
total values when the attachment size is unknown.
In `@packages/stream_core/test/helpers/attachment.dart`:
- Line 13: Update the attachment helper imports to include dart:typed_data so
Uint8List resolves directly, while leaving AttachmentFile.fromData and the
existing test behavior unchanged.
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📒 Files selected for processing (14)
packages/stream_core/CHANGELOG.mdpackages/stream_core/lib/src/attachment.dartpackages/stream_core/lib/src/attachment/attachment.dartpackages/stream_core/lib/src/attachment/attachment_upload_state.dartpackages/stream_core/lib/src/attachment/uploader/attachment_upload_batch.dartpackages/stream_core/lib/src/attachment/uploader/attachment_upload_state.dartpackages/stream_core/lib/src/attachment/uploader/attachment_upload_task.dartpackages/stream_core/lib/src/attachment/uploader/attachment_uploader.dartpackages/stream_core/lib/src/attachment/uploader/batch_upload_state.dartpackages/stream_core/lib/stream_core.dartpackages/stream_core/test/attachment/attachment_upload_batch_test.dartpackages/stream_core/test/attachment/attachment_upload_task_test.dartpackages/stream_core/test/helpers/attachment.dartpackages/stream_core/test/helpers/fake_cdn_client.dart
💤 Files with no reviewable changes (1)
- packages/stream_core/lib/src/attachment/attachment_upload_state.dart
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The transport counts the multipart framing as well as the file, so clamping its count to the file's length reported the upload as complete as soon as the bytes before the framing had gone out. The counts are scaled instead, so progress reaches the file's length when the request has, and a file whose length could not be read still reports what the transport saw. `BatchUploadResult.items` is handed back unmodifiable, so a caller cannot reorder or clear the one-outcome-per-attachment list it documents. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`UploadProgress` named the multipart framing the transport adds, and `cancel` named the transport and the CDN. What a caller needs is the contract: the counts are the attachment's own bytes, and cancelling is not undoing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
**Validation before construction.** `AttachmentUploadBatchImpl` built its tasks in the initializer list and only then checked its arguments, so a duplicate id threw with the earlier tasks already reading their files, subscribed, and holding an emitter that would never close. A factory validates first; nothing exists to abandon. **`UploadProgress.totalBytes` is nullable.** It used `0` for "length unknown", which a genuinely empty file could not be told apart from — that file read as 0% right through to success. It now says `null` for unknown, the way `BatchUploadProgress.totalBytes` already did, and both `fraction` getters answer `null` for an unknown total and `1.0` when the total is known and zero. The progress path stops inventing a total from the transport's own count when it has nothing to scale to. **Dead guard.** `_pump`'s `if (_ending == null)` was unreachable — every unstarted task settles synchronously when a batch gives up, so the loop's `isFinal` check already skips them. Its comment said as much. Narrows three dartdoc claims the code does not make, and reorders the progress scaling so it cannot overflow. Adds the three cases the review found untested: several slots freeing in one turn, a batch with an unmeasurable attachment completing, and a cancellation landing while the file is still being read. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Picks up the review fixes on GetStream/stream-core-flutter#170, including `UploadProgress.totalBytes` becoming nullable. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
It took the attachments and a `CdnClient` only to build the tasks the factory had already validated the input for, leaving construction split across both. The factory now builds them and the private constructor registers them, so `CdnClient` stops being threaded through a constructor that never uploads anything. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
The batch subscribes to every upload and cancels nothing, which is only safe because each upload closes its own channel as it settles and the batch cannot finish until all of them have. Nothing said so: the existing assertions cover one task's channel and the batch's own, not the tasks a batch settles on the caller's behalf without ever starting them. Verified by making a cancelled upload keep its channel open, which this catches. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Reads as validate, build, hand over, rather than burying the build in an argument list. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`AttachmentUploader` carried one-line stubs while `StreamAttachmentUploader` carried the contract, which is backwards: an implementer reads the interface, and two copies of a contract drift. The interface now holds it and the overrides inherit it. Fills the gaps the style guide asks about and the docs did not answer: where a task or batch is obtained, who owns it, what needs disposing, that one upload failing does not fail a batch, and that a failed upload carries its error rather than throwing while a bad argument does throw. `AttachmentUploadBatch.id` said "This batch's identity", which is the guide's own example of a doc written from the name alone; it now says what the value is good for. Drops the stream mechanics the guide rules out, and corrects `_pump`'s comment, which still described the `_ending` check that is no longer there. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Read against the vendored guide rather than the style guide's summary of it, which turned up three things: `AttachmentUploader` opened with a verb phrase where a type comment describes an instance — every other interface in this package opens with a noun phrase. `AttachmentUploadTask.state` and `result`, and `AttachmentUploadBatch.state`, said "the upload's" and "the batch's" where the guide asks for "this". And `result` claimed never to throw, which a `Future` cannot do either way: it never completes with an error. The task's sample listened, cancelled, then awaited the result of what it had just called off — a shape nobody would write. It now shows the path callers take, and `cancel` documents cancelling. `UploadProgress` and `BatchUploadProgress` gained samples covering the case worth teaching: `fraction` is `null` when the length is unknown, so a bar has an indeterminate state to draw. Every sample was compiled against the package before landing; the batch's also stopped passing `maxConcurrent: 3`, which is the default and read as though it were required. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
It had one implementor, no use as a type anywhere, and pointed at the wrong seam. `CdnClient` is what an app supplies to upload somewhere else — four methods about moving bytes — whereas implementing this meant reimplementing the scheduler behind it: the concurrency limit, the progress aggregation, the terminal-state-wins rule, the cancellation semantics. The dartdoc recommended exactly that, which was bad advice. Nothing was reaching for it either. Every test in this package fakes `CdnClient`, and `stream_feeds` names `StreamAttachmentUploader` at all six of its use sites, including its public getter and an extension — so the interface could not have been substituted there even deliberately. The contract moves back onto the class, and says plainly that a different [CdnClient] is how uploads go elsewhere. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`sent + switch (...)` forced the switch to wrap under an operator and indent past the fold's closure. Adding into a local puts it at statement level, where it formats on its own terms. Also unwraps a doc paragraph a rename had split mid-sentence. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Two samples handed `progress.fraction` straight to something expecting a `double`, in the same commit that added a sample for handling its `null`. They now show the two ways: `?? 0` where a switch has to produce a value for every state, and a null-check pattern where the case can be skipped. `BatchUploadProgress.sentBytes` said "attachment bytes", which an attachment whose length could not be read breaks — it contributes what went out for it, which can come to more. The test asserting 1400 already depended on that; now the doc says it. `cancel` said a finished batch ignores it without saying a batch already giving up on a failure does too, so a reader could expect cancelling to turn a stop-on-error into a cancellation. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Both branches appended to the same CHANGELOG section, so the entries were kept side by side with the error layer's leading, since it lands first. The base also stopped re-exporting `dart:typed_data`, which this branch's attachment test helper was reaching `Uint8List` through. It imports it directly now — the import the analyzer called unnecessary before the merge, and requires after it. Merged rather than rebased: this PR has reviews, and a rebase would rewrite the commits they were left on. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Three places described how an upload happens rather than what it promises. `StreamAttachmentUploader` said it decides which endpoint an attachment belongs to, which is dispatch a caller cannot act on. `UploadProgress` and `BatchUploadProgress.sentBytes` both alluded to what a request costs on top of the file, which is the same leak said twice. The caller-visible facts survive: the counts are the attachment's own bytes, an unreadable length leaves no total to measure against, and `fraction` reads as unknown while that is true. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`STYLE_GUIDE.md` asks for one short bullet and rules out per-method enumeration and internal notes. The `UploadState*` entry listed all four retired named constructors; the `AttachmentUploadTask` entry explained what `cancel` does about a `CdnClient` that never answers, which is a dartdoc concern. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Removing it was a misclassification. `AttachmentFile.fromData(Uint8List bytes, ...)` is the documented path for web, so a caller cannot avoid naming `Uint8List` — which makes it necessary public API on exactly the grounds that justify re-exporting `CdnClient`'s Dio types, not an accidental leak. Reverting also spares consumers an `unnecessary_import` on the very import they should be writing. It now leaves from `attachment_file.dart`, beside the signature that needs it, rather than incidentally from the WebSocket engine, and shows only `Uint8List` — the one typed_data type this package's API mentions. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`show Uint8List` covered this package's own API but narrowed what 0.4.0 handed consumers: `ByteData` and the other typed lists stopped resolving through the barrel, which is a break in its own right and would have needed an entry. The full export restores exact parity with the released version, so there is nothing to report. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Moving it to `attachment_file.dart` was a tidy I had no reason to spend a diff on. It is back in `web_socket_engine.dart`, byte-identical to main, so this branch no longer touches the export at all. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
…chment-upload-task-api
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Approving — the design is sound, the docs are unusually good, and the test suite covers the races in both directions. I found no correctness bugs. A handful of notes inline, none blocking.
What I verified
Checked out ca4f472 in a scratch worktree:
dart analyze --fatal-infos— cleandart format --set-exit-if-changed— clean (134 files, 0 changed)dart test— 765 passed, including all 51 new attachment tests- No in-repo consumers of the removed API (
uploadState,UploadState*,AttachmentUploadException,OnUploadProgress,StreamAttachmentUploaderBatch) — grep overpackages/andapps/is empty, so the breaking surface really is external-only web_socket_engine.dartis byte-identical tomain, so the typed_data churn nets out to a clean revert
What I probed beyond the suite
Eight scenarios the tests don't cover, all behaving as documented:
- a failed (not cancelled) upload's partial bytes surviving into the aggregate — 400 partial + fail + 1000 success gives
sentBytes1400 - a directly-cancelled task inside a batch freeing exactly one slot (
inFlightstays atmaxConcurrent,receivedgoes 2 → 3) - every task cancelled before the first
_pump—BatchQueued → BatchCancelling → BatchFinished,BatchUploadCancelled - three slots freed in one turn under
eagerError, concurrency never exceeded uploadsgenuinely unmodifiable (UnsupportedError)- the empty batch settling as
BatchUploadCompletedwithfraction1.0
The scheduling logic holds up under scrutiny. _cancelUnsettled making every task terminal synchronously is what lets _pump's isFinal skip subsume the giving-up check; counting _settledCount rather than deriving it from task states is the right call for the reason the comment gives; and _finishing being set before the await in _finishIfSettled is what keeps a late cancel() from rewriting the outcome. Each of those is the kind of thing that would have been a bug if done the obvious way.
Not inline
The two I'd most like to see addressed are the UploadQueued dartdoc and a test pinning the failure path's partial bytes — details in the inline threads.
One process note: this PR deletes #168's dart:typed_data CHANGELOG entry along with the change it described. That's correct given they land in sequence, but worth a heads-up to anyone still reviewing #168.
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| /// The upload is waiting for a turn, and has not touched its file yet. |
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"has not touched its file yet" isn't true inside a batch. AttachmentUploadBatchImpl._measure runs for every task in the constructor and reaches attachment.file.size → XFile.length(), which stats the file for a path-backed attachment while the task is still UploadQueued.
That's deliberate, and documented as such elsewhere ("every attachment's length is read up front") — it's just this one sentence that contradicts it. "has not started sending" would be accurate for both the standalone and the batch case.
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Fixed — reads "has not started sending" now, which holds for the standalone task and inside a batch alike.
| sentBytes += switch (task.state.value) { | ||
| UploadInProgress(:final progress) => progress.sentBytes, | ||
| UploadSuccess() => _totals[task.id] ?? _sent[task.id] ?? 0, | ||
| _ => _sent[task.id] ?? 0, |
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This branch is the only place in _aggregate where a byte count comes from _sent — i.e. from the async task.state.listen callback — rather than from _totals or the task's live state. So it's the one line whose correctness depends on the state-event microtask being delivered before the result.then microtask that runs _onTaskSettled.
It does work: I checked a batch of 400-partial-then-fail alongside a 1000-byte success and got sentBytes 1400. But nothing pins it. All seven batch progress tests exercise either success (where the _totals fallback on the line above masks _sent entirely) or cancellation. A failed upload's partial bytes are asserted nowhere.
Worth a test, because the assumption is invisible from the code and a future change to StateEmitter's sync flag would silently break it.
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Added the test — batch progress keeps the bytes a failed upload had already sent, your 400-partial-then-fail alongside a 1000-byte success, asserting 1400.
Checked that it pins the thing rather than just passing: with _ => _sent[task.id] ?? 0 mutated to _ => 0, it fails with Expected: <1400> Actual: <1000>, and it is the only test in the file that does.
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N subscriptions opened here, never stored and never cancelled. The dartdoc says "Nothing needs disposing", and the test at attachment_upload_batch_test.dart:36 does pin that they end — but only because every task closes its own channel as it settles.
The case that falls outside that: a CdnClient that never answers, with a caller that never calls cancel(). Then the batch and all N subscriptions stay alive indefinitely, and cancel() is the only way out. That's fine as a design, but STYLE_GUIDE §"Be explicit about dispose() and the object lifecycle" asks for it to be said out loud, and StreamWebSocketClient gained Disposable in this same release.
A sentence in the batch dartdoc naming cancel() as what releases an abandoned batch would close the gap without adding API.
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Said out loud, in the batch dartdoc: cancel is what stops a batch before it finishes, "including a batch abandoned while a CdnClient never answers, which finishes on nothing else".
Kept it to the sentence rather than adding Disposable. The subscriptions are the batch's own and end when the tasks close their channels, so there is nothing a caller could dispose that cancel does not already reach — an API would suggest a second thing to remember.
| final Result<UploadedAttachment> result; | ||
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| List<Object?> get props => [attachment, result]; |
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StreamAttachment has no ==, so including attachment in props makes this field compare by identity — which quietly makes the whole class's equality unusable for anyone constructing an expected value in a test.
Either drop attachment from props (the attachment's id is already what addresses the item, and result carries the payload), or make StreamAttachment Equatable. As it stands the Equatable base promises more than it delivers.
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Fixed, though neither option quite closed it: result has the same problem. Success.props is [data], and UploadedAttachment had no == either — so dropping attachment from props would have left the class just as unusable for a test, only less obviously.
Went the other way on which type gets equality. UploadedAttachment now extends Equatable: it holds ids, urls and a custom map, nothing expensive to compare. StreamAttachment deliberately does not — it wraps an AttachmentFile, so value equality there would compare bytes on every ==, which is not what a caller asking "same attachment?" means. The item reads attachment.id, which is what addresses it anyway.
Three tests in a new batch_upload_state_test.dart pin it: equal by value for the same id and outcome, unequal for a different attachment or a different outcome, and a failed outcome comparing by the exception it carries.
UploadedAttachment shipped in v0.4.0 without value equality, so it is in the CHANGELOG under breaking changes.
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| /// Every attachment reached a terminal state on its own. |
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Minor: a batch where the caller cancelled one upload directly still lands here, which "Completed" doesn't lead a reader to expect. The behaviour is right and tested (does not give up when one of its uploads is cancelled) — it's the name doing the misleading, and one clause here would defuse it, the way the class-level dartdoc already defuses the failure case.
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Defused, the way the class-level dartdoc does for the failure case: "Completed" is about the batch, not its items — one that was refused, or one the caller cancelled by itself, still finishes here; only cancelling the batch or eagerError giving up ends it any other way.
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| if (exception case StreamNetworkException(isCancelled: true)) { |
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When the CDN itself reports the cancellation, this re-wraps a StreamNetworkException inside a new StreamNetworkException(message: 'The upload was cancelled'), pushing the original — with its closeCode and any transport detail — down into cause.
For the user-initiated path above (line 217) the wrap is right: there is no incoming exception worth keeping. Here there is, and it already has the shape the caller wants. Passing it through when it's already a StreamNetworkException(isCancelled: true) would keep more information at no cost to the contract.
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Agreed, and passed through. That arm now settles with the exception as it arrived instead of routing back through _settleCancelled, so the closeCode and whatever else the transport put on it stay on the reported failure rather than one level down in cause.
Left line 217 wrapping, for the reason you gave: there the SDK cancelled the token itself, so its own message is the authoritative account and the client's error is a consequence — worth keeping as cause, not worth promoting.
Test pins the distinction: the CDN answers with a StreamNetworkException(isCancelled: true, closeCode: 1000) without the token ever being cancelled, and the result carries same(reported).
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| export 'src/attachment.dart'; | ||
| export 'src/attachment.dart' hide AttachmentUploadBatchImpl, AttachmentUploadTaskImpl; |
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First hide in this barrel. Hiding the two Impls in src/attachment.dart instead — export 'attachment/uploader/attachment_upload_task.dart' hide AttachmentUploadTaskImpl; — would keep the public barrel a plain export list and keep the exclusion next to the thing it excludes. The batch imports the task file directly rather than through the sub-barrel, so nothing internal breaks.
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Not the first, as it turns out — main already carries one on the line below:
$ git show main:packages/stream_core/lib/stream_core.dart
...
export 'src/utils.dart' hide SharedEmitterImpl, StateEmitterImpl;So hiding the Impls at the top-level barrel is the established convention here, and moving these two into src/attachment.dart would leave the barrel with two ways of doing the same thing. Leaving it as it is.
(Related: #168 adds objectRuntimeType to that same hide for a Flutter name collision, so the line grows either way. The base merge in this branch picked it up cleanly.)
| import '../helpers/attachment.dart'; | ||
| import '../helpers/fake_cdn_client.dart'; | ||
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586 lines across 6 groups, against STYLE_GUIDE §"Prefer more test files, avoid long test files" and §"Use group sparingly". The groups here already name the split: scheduling/concurrency, error policy (the two under … groups), cancel, and progress. Not worth blocking on, but it's the size at which the guide says to split rather than add a seventh group.
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Split, as its own commit so the substantive fixes stay reviewable separately. The groups were the seams:
attachment_upload_batch_test.dart— construction, ordering, concurrency (144 lines)attachment_upload_batch_error_test.dart— bothunder …groups (198)attachment_upload_batch_cancel_test.dart— cancellation (104)attachment_upload_batch_progress_test.dart— progress (196)
A pure move: 28 tests before, 28 after, none edited. The new failed-bytes test landed in the original file first, in the commit before, so that diff reads on its own rather than inside the move.
…chment-upload-task-api
When the client reports the cancellation itself, the exception is already the shape a caller wants and carries the transport's detail. Re-wrapping it in a fresh `StreamNetworkException` pushed that down into `cause` to say nothing new. The user-initiated path still wraps: there the SDK's own message is the authoritative one, and the client's error is a consequence of it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`BatchUploadItemResult` extends `Equatable`, but held a `StreamAttachment` and an `UploadedAttachment` that both compare by identity — so the base promised an equality it could not deliver, and no test could build an expected value. `UploadedAttachment` gains value equality; it holds ids and urls, nothing expensive to compare. `StreamAttachment` deliberately does not: it wraps a file, and comparing its bytes on every `==` is not what a caller asked for. The item reads the attachment's id instead, which is what addresses it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
…" covers Three sentences that read further than they hold: a queued upload has had its file measured already, so it has not started *sending* rather than not touched it; an abandoned batch finishes on `cancel` and nothing else, which "nothing needs disposing" left unsaid; and `BatchUploadCompleted` is about the batch, so an upload the caller cancelled by itself still lands there. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
A failed upload is the one term in the aggregate read from the byte count the state listener recorded rather than one derived beside it, so it is the only line that depends on a progress event being delivered before the settle that follows. Every existing progress test covers success or cancellation, where a total masks it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
… name 586 lines in one file, against the style guide's "prefer more test files". The six groups already described the split, so this is a move: scheduling and construction stay put, error policy, cancellation and progress each get their own file. No test changed. 28 before, 28 after. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
`case final StreamNetworkException cancelled when cancelled.isCancelled` is the same test as `case StreamNetworkException(isCancelled: true)`, which the line read before. The binding was there to pass the narrowed value on, but an if-case promotes the matched variable in its body, so it bought nothing and made a one-line change look like a rewritten condition. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
471 lines and five groups, the shape the batch file was in. The groups map onto the same four seams, so both families now read with one naming scheme: the bare file is the lifecycle, and `_progress`, `_cancel` and `_failure` carry the rest. A move: 24 tests before, 24 after. `when the upload is cancelled` joins `cancel`, being one test about the same thing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
…chment-upload-task-api
`StreamException` no longer has a `stackTrace`, so the two upload sites that set one drop it — both hand the exception straight to `Result.failure`, which has carried the trace all along. That leaves `BatchUploadStoppedOnError` as the one place a trace was lost: it is built from the failing task's state, which records what went wrong and not where. The batch already has the task's `Result` and threw it away, so the trace it carries reaches the batch result with no new slot on `UploadFailed`. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
…chment-upload-task-api
`same` is `identical`, and `identical(null, null)` holds — so dropping the trace at the task level would have left this test green. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2 participants
Stacked on #168 — review that first, and merge this after it.
An upload is not a request-response call: it has a lifecycle worth watching, it can be called off, and it has an outcome to wait for. Today those are spread across a
Future, aProgressCallbackand a DioCancelToken. This puts all three on one object.What it adds
AttachmentUploadTask—stateis the single canonical channel (progress is part of it, not a second source),resultsettles exactly once and never throws,cancel()is idempotent and safe on a settled task. Terminal states are immutable: the first one committed wins.AttachmentUploadBatch— orchestrates the same tasks, holding them back to honourmaxConcurrentas a strict upper bound. Exposes the child tasks, so cancelling or watching one attachment is the same API whether or not it is in a batch.BatchUploadResult—BatchUploadCompleted,BatchUploadStoppedOnError(error),BatchUploadCancelled, followingDisconnectionSource: the variant that has an error is the one that declares it.Breaking
uploadreturns a task rather than aFuture<Result<...>>;uploadBatchreturns a batch rather than aStream.AttachmentUploadException, theOnUploadProgress/OnBatchUploadProgresscallbacks and theStreamAttachmentUploaderBatchextension are gone, andmaxConcurrentnow defaults to3rather than5.CancelTokenand progress callbacks are gone from the public API — the transport is an implementation detail again.StreamAttachment.uploadStateis gone. Where an upload has got to belongs to the task running it, not the model.UploadState*classes are renamed and reshaped:UploadStateInProgressis nowUploadInProgresscarrying anUploadProgressin bytes rather than adouble,UploadStateSuccessisUploadSuccesscarrying theUploadedAttachment,UploadStateFailedisUploadFailedwith aStreamExceptionrather than anObject, andUploadQueuedandUploadCancelledare new. TheAttachmentUploadState.preparing(),.inProgress(),.success()and.failed()named constructors are gone. See the CHANGELOG.Naming
AttachmentUploadStateUploadQueued,UploadPreparing,UploadInProgress,UploadSuccess,UploadFailed,UploadCancelledBatchUploadStateBatchQueued,BatchInProgress,BatchStopping,BatchCancelling,BatchFinishedBatchUploadResultBatchUploadCompleted,BatchUploadStoppedOnError,BatchUploadCancelledVerification
dart analyze --fatal-infosanddart formatclean; 765 tests pass, 51 of themnew and covering the races in both directions.
Follow-up: the
CdnClientseam takesAttachmentFilerather thanStreamAttachment, which chat's channel-scoped upload path needs — see thereview threads.