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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_STREAM_PROMISE_RESOLVER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_STREAM_PROMISE_RESOLVER_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/bindings/trace_wrapper_v8_reference.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "v8/include/v8.h"
namespace blink {
class ScriptPromise;
class ScriptState;
class Visitor;
// A thin wrapper around v8::Promise::Resolver that matches the semantics used
// for promises in the standard. StreamPromiseResolver is used for promises that
// need to be stored somewhere: promises on the stack should generally use
// v8::Local<v8::Promise>, or ScriptPromise if they are to be returned to the
// bindings code.
class CORE_EXPORT StreamPromiseResolver final
: public GarbageCollected<StreamPromiseResolver> {
public:
// Implements "a promise rejected with" from the INFRA standard.
// https://www.w3.org/2001/tag/doc/promises-guide/#a-promise-rejected-with
// Prefer PromiseResolve() in miscellaneous_operations.h if the value is to be
// returned to JavaScript without storing it. This function should not be used
// when |value| might be a Promise already, as it will not pass it through
// unchanged at the standard requires.
static StreamPromiseResolver* CreateResolved(ScriptState*,
v8::Local<v8::Value> value);
// Implements "a promise resolved with *undefined*". Prefer
// PromiseResolveWithUndefined() from miscellaneous_operations.h if the value
// is to be returned to JavaScript without storing it.
static StreamPromiseResolver* CreateResolvedWithUndefined(ScriptState*);
// Implements "a promise rejected with" from the INFRA standard.
// https://www.w3.org/2001/tag/doc/promises-guide/#a-promise-rejected-with
// Prefer PromiseResolveWithUndefined() from miscellaneous_operations.h if the
// value is to be returned directly to JavaScript.
static StreamPromiseResolver* CreateRejected(ScriptState*,
v8::Local<v8::Value> reason);
// Creates an initialised promise.
explicit StreamPromiseResolver(ScriptState*);
~StreamPromiseResolver();
// Resolves the promise with |value|. Does nothing if the promise is already
// settled.
void Resolve(ScriptState*, v8::Local<v8::Value> value);
// Resolves the promise with undefined.
void ResolveWithUndefined(ScriptState*);
// Rejects the promise with |reason|. Does nothing if the promise is already
// resolved.
void Reject(ScriptState*, v8::Local<v8::Value> reason);
// Returns the promise wrapped in a ScriptPromise.
ScriptPromise GetScriptPromise(ScriptState* script_state) const;
// Returns the promise as a v8::Promise.
v8::Local<v8::Promise> V8Promise(v8::Isolate* isolate) const;
// Marks the promise is handled, so if it is rejected it won't be considered
// an unhandled rejection.
void MarkAsHandled(v8::Isolate*);
// Returns the state of the promise, one of pending, fulfilled or rejected.
v8::Promise::PromiseState State(v8::Isolate*) const;
// Returns true if the the promise is not pending.
bool IsSettled() const { return is_settled_; }
void Trace(Visitor*);
private:
TraceWrapperV8Reference<v8::Promise::Resolver> resolver_;
bool is_settled_ = false;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_STREAM_PROMISE_RESOLVER_H_
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