/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim:set ts=2 sw=2 sts=2 et cindent: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// https://streams.spec.whatwg.org/#set-up-writable-stream-default-controller-from-underlying-sink void UnderlyingSinkAlgorithms::StartCallback(
JSContext* aCx, WritableStreamDefaultController& aController,
JS::MutableHandle<JS::Value> aRetVal, ErrorResult& aRv) { if (!mStartCallback) { // Step 2: Let startAlgorithm be an algorithm that returns undefined.
aRetVal.setUndefined(); return;
}
// Step 6: If underlyingSinkDict["start"] exists, then set startAlgorithm to // an algorithm which returns the result of invoking // underlyingSinkDict["start"] with argument list « controller » and callback // this value underlyingSink.
JS::Rooted<JSObject*> thisObj(aCx, mUnderlyingSink); return mStartCallback->Call(thisObj, aController, aRetVal, aRv, "UnderlyingSink.start",
CallbackFunction::eRethrowExceptions);
}
// https://streams.spec.whatwg.org/#set-up-writable-stream-default-controller-from-underlying-sink
already_AddRefed<Promise> UnderlyingSinkAlgorithms::WriteCallback(
JSContext* aCx, JS::Handle<JS::Value> aChunk,
WritableStreamDefaultController& aController, ErrorResult& aRv) { if (!mWriteCallback) { // Step 3: Let writeAlgorithm be an algorithm that returns a promise // resolved with undefined. return Promise::CreateResolvedWithUndefined(mGlobal, aRv);
}
// Step 7: If underlyingSinkDict["write"] exists, then set writeAlgorithm to // an algorithm which takes an argument chunk and returns the result of // invoking underlyingSinkDict["write"] with argument list « chunk, controller // » and callback this value underlyingSink.
JS::Rooted<JSObject*> thisObj(aCx, mUnderlyingSink);
RefPtr<Promise> promise = mWriteCallback->Call(
thisObj, aChunk, aController, aRv, "UnderlyingSink.write",
CallbackFunction::eRethrowExceptions); return promise.forget();
}
// https://streams.spec.whatwg.org/#set-up-writable-stream-default-controller-from-underlying-sink
already_AddRefed<Promise> UnderlyingSinkAlgorithms::CloseCallback(
JSContext* aCx, ErrorResult& aRv) { if (!mCloseCallback) { // Step 4: Let closeAlgorithm be an algorithm that returns a promise // resolved with undefined. return Promise::CreateResolvedWithUndefined(mGlobal, aRv);
}
// Step 8: If underlyingSinkDict["close"] exists, then set closeAlgorithm to // an algorithm which returns the result of invoking // underlyingSinkDict["close"] with argument list «» and callback this value // underlyingSink.
JS::Rooted<JSObject*> thisObj(aCx, mUnderlyingSink);
RefPtr<Promise> promise =
mCloseCallback->Call(thisObj, aRv, "UnderlyingSink.close",
CallbackFunction::eRethrowExceptions); return promise.forget();
}
// https://streams.spec.whatwg.org/#set-up-writable-stream-default-controller-from-underlying-sink
already_AddRefed<Promise> UnderlyingSinkAlgorithms::AbortCallback(
JSContext* aCx, const Optional<JS::Handle<JS::Value>>& aReason,
ErrorResult& aRv) { if (!mAbortCallback) { // Step 5: Let abortAlgorithm be an algorithm that returns a promise // resolved with undefined. return Promise::CreateResolvedWithUndefined(mGlobal, aRv);
}
// Step 9: Let abortAlgorithm be an algorithm that returns a promise resolved // with undefined.
JS::Rooted<JSObject*> thisObj(aCx, mUnderlyingSink);
RefPtr<Promise> promise =
mAbortCallback->Call(thisObj, aReason, aRv, "UnderlyingSink.abort",
CallbackFunction::eRethrowExceptions);
return promise.forget();
}
// https://streams.spec.whatwg.org/#writable-set-up // This one is not covered by the above section as the spec expects any spec // implementation to explicitly return a promise for this callback. It's still // useful for Gecko as error handling is very frequently done with // ErrorResult instead of a rejected promise. See also // https://github.com/whatwg/streams/issues/1253.
already_AddRefed<Promise> UnderlyingSinkAlgorithmsWrapper::WriteCallback(
JSContext* aCx, JS::Handle<JS::Value> aChunk,
WritableStreamDefaultController& aController, ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = xpc::CurrentNativeGlobal(aCx); return PromisifyAlgorithm(
global,
[&](ErrorResult& aRv) { return WriteCallbackImpl(aCx, aChunk, aController, aRv);
},
aRv);
}
// https://streams.spec.whatwg.org/#writable-set-up // Step 2.1: Let closeAlgorithmWrapper be an algorithm that runs these steps:
already_AddRefed<Promise> UnderlyingSinkAlgorithmsWrapper::CloseCallback(
JSContext* aCx, ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = xpc::CurrentNativeGlobal(aCx); return PromisifyAlgorithm(
global, [&](ErrorResult& aRv) { return CloseCallbackImpl(aCx, aRv); },
aRv);
}
// https://streams.spec.whatwg.org/#writable-set-up // Step 3.1: Let abortAlgorithmWrapper be an algorithm that runs these steps:
already_AddRefed<Promise> UnderlyingSinkAlgorithmsWrapper::AbortCallback(
JSContext* aCx, const Optional<JS::Handle<JS::Value>>& aReason,
ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = xpc::CurrentNativeGlobal(aCx); return PromisifyAlgorithm(
global,
[&](ErrorResult& aRv) { return AbortCallbackImpl(aCx, aReason, aRv); },
aRv);
}
NS_IMETHODIMP
WritableStreamToOutput::OnOutputStreamReady(nsIAsyncOutputStream* aStream) { if (!mData) { return NS_OK;
}
MOZ_ASSERT(mPromise);
uint32_t written = 0;
nsresult rv = mOutput->Write( reinterpret_cast<constchar*>(mData->Elements() + mWritten),
mData->Length() - mWritten, &written); if (NS_FAILED(rv) && rv != NS_BASE_STREAM_WOULD_BLOCK) {
mPromise->MaybeRejectWithAbortError("Error writing to stream"_ns);
ClearData(); // XXX should we add mErrored and fail future calls immediately? // I presume new calls to Write() will fail though, too return rv;
} if (NS_SUCCEEDED(rv)) {
mWritten += written;
MOZ_ASSERT(mWritten <= mData->Length()); if (mWritten >= mData->Length()) {
mPromise->MaybeResolveWithUndefined();
ClearData(); return NS_OK;
} // more to write
} // wrote partial or nothing // Wait for space
nsCOMPtr<nsIEventTarget> target = mozilla::GetCurrentSerialEventTarget();
rv = mOutput->AsyncWait(this, 0, 0, target); if (NS_FAILED(rv)) {
mPromise->MaybeRejectWithUnknownError("error waiting to write data");
ClearData(); // XXX should we add mErrored and fail future calls immediately? // New calls to Write() will fail, note // See step 5.2 of // https://streams.spec.whatwg.org/#writable-stream-default-controller-process-write. return rv;
} return NS_OK;
}
// Try to write first, and only enqueue data if we were already blocked // or the write didn't write it all. This avoids allocations and copies // in common cases.
MOZ_ASSERT(!mPromise);
MOZ_ASSERT(mWritten == 0);
uint32_t written = 0;
ProcessTypedArraysFixed(data, [&](const Span<uint8_t>& aData) {
Span<uint8_t> dataSpan = aData;
nsresult rv = mOutput->Write(mozilla::AsChars(dataSpan).Elements(),
dataSpan.Length(), &written); if (NS_FAILED(rv) && rv != NS_BASE_STREAM_WOULD_BLOCK) {
promise->MaybeRejectWithAbortError("error writing data"); return;
} if (NS_SUCCEEDED(rv)) { if (written == dataSpan.Length()) {
promise->MaybeResolveWithUndefined(); return;
}
dataSpan = dataSpan.From(written);
}
auto buffer = Buffer<uint8_t>::CopyFrom(dataSpan); if (buffer.isNothing()) {
promise->MaybeReject(NS_ERROR_OUT_OF_MEMORY); return;
}
mData = std::move(buffer);
});
if (promise->State() != Promise::PromiseState::Pending) { return promise.forget();
}
already_AddRefed<Promise> WritableStreamToOutput::AbortCallbackImpl(
JSContext* aCx, const Optional<JS::Handle<JS::Value>>& aReason,
ErrorResult& aRv) { // https://streams.spec.whatwg.org/#writablestream-set-up // Step 3. Let abortAlgorithmWrapper be an algorithm that runs these steps:
// XXX The close or rather a dedicated abort should be async. For now we have // to always fall back to the Step 3.3 below. // XXX how do we know this stream is used by webtransport?
mOutput->CloseWithStatus(NS_ERROR_WEBTRANSPORT_CODE_BASE);
// Step 3.3. Return a promise resolved with undefined. // Wrapper handles this return nullptr;
}
