Promise-based RTCPeerConnection::getStats implementation.

third_party/WebKit/Source/modules/peerconnection/RTCStatsReport.cpp

+// Copyright 2016 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.
+
+#include "modules/peerconnection/RTCStatsReport.h"
+
+namespace blink {
+
+namespace {
+
+template<typename StringType>

[hta - Chromium, 2016/09/26 13:21:13]

Why template<typename StringType> and not the traditional <typename T>?

[hbos_chromium, 2016/09/26 14:00:16]

Not sure :) Changed to T.

+bool addPropertyValue(v8::Local<v8::Object>& v8Object, v8::Isolate* isolate, StringType name, v8::Local<v8::Value> value)
+{
+    return v8CallBoolean(v8Object->CreateDataProperty(isolate->GetCurrentContext(), v8String(isolate, name), value));
+}
+
+template<typename T>
+bool addPropertySequenceOfNumbers(v8::Local<v8::Object>& v8Object, v8::Isolate* isolate, WebString name, const WebVector<T>& webVector)
+{
+    v8::Local<v8::Array> v8Array = v8::Array::New(isolate, webVector.size());
+    for (size_t i = 0; i < webVector.size(); ++i) {
+        if (!v8CallBoolean(v8Array->CreateDataProperty(isolate->GetCurrentContext(), static_cast<uint32_t>(i), v8::Number::New(isolate, static_cast<double>(webVector[i])))))
+            return false;
+    }
+    return addPropertyValue(v8Object, isolate, name, v8Array);
+}
+
+bool addPropertySequenceOfStrings(v8::Local<v8::Object>& v8Object, v8::Isolate* isolate, WebString name, const WebVector<WebString>& webVector)
+{
+    v8::Local<v8::Array> v8Array = v8::Array::New(isolate, webVector.size());
+    for (size_t i = 0; i < webVector.size(); ++i) {
+        if (!v8CallBoolean(v8Array->CreateDataProperty(isolate->GetCurrentContext(), static_cast<uint32_t>(i), v8String(isolate, webVector[i]))))
+            return false;
+    }
+    return addPropertyValue(v8Object, isolate, name, v8Array);
+}
+
+v8::Local<v8::Value> webRTCStatsToValue(ScriptState* scriptState, const WebRTCStats* stats)
+{
+    v8::Isolate* isolate = scriptState->isolate();
+    v8::Local<v8::Object> v8Object = v8::Object::New(isolate);
+
+    bool success = true;
+    success &= addPropertyValue(v8Object, isolate, "id", v8String(isolate, stats->id()));
+    success &= addPropertyValue(v8Object, isolate, "timestamp", v8::Number::New(isolate, stats->timestamp()));
+    success &= addPropertyValue(v8Object, isolate, "type", v8String(isolate, stats->type()));
+    for (size_t i = 0; i < stats->membersCount() && success; ++i) {
+        std::unique_ptr<WebRTCStatsMember> member = stats->getMember(i);
+        if (!member->isDefined())
+            continue;
+        WebString name = member->name();
+        switch (member->type()) {
+        case WebRTCStatsMemberTypeInt32:
+            success &= addPropertyValue(v8Object, isolate, name, v8::Number::New(isolate, static_cast<double>(member->valueInt32())));
+            break;
+        case WebRTCStatsMemberTypeUint32:
+            success &= addPropertyValue(v8Object, isolate, name, v8::Number::New(isolate, static_cast<double>(member->valueUint32())));
+            break;
+        case WebRTCStatsMemberTypeInt64:
+            success &= addPropertyValue(v8Object, isolate, name, v8::Number::New(isolate, static_cast<double>(member->valueInt64())));
+            break;
+        case WebRTCStatsMemberTypeUint64:
+            success &= addPropertyValue(v8Object, isolate, name, v8::Number::New(isolate, static_cast<double>(member->valueUint64())));
+            break;
+        case WebRTCStatsMemberTypeDouble:
+            success &= addPropertyValue(v8Object, isolate, name, v8::Number::New(isolate, member->valueDouble()));
+            break;
+        case WebRTCStatsMemberTypeString:
+            success &= addPropertyValue(v8Object, isolate, name, v8String(isolate, member->valueString()));
+            break;
+        case WebRTCStatsMemberTypeSequenceInt32:
+            success &= addPropertySequenceOfNumbers(v8Object, isolate, name, member->valueSequenceInt32());
+            break;
+        case WebRTCStatsMemberTypeSequenceUint32:
+            success &= addPropertySequenceOfNumbers(v8Object, isolate, name, member->valueSequenceUint32());
+            break;
+        case WebRTCStatsMemberTypeSequenceInt64:
+            success &= addPropertySequenceOfNumbers(v8Object, isolate, name, member->valueSequenceInt64());
+            break;
+        case WebRTCStatsMemberTypeSequenceUint64:
+            success &= addPropertySequenceOfNumbers(v8Object, isolate, name, member->valueSequenceUint64());
+            break;
+        case WebRTCStatsMemberTypeSequenceDouble:
+            success &= addPropertySequenceOfNumbers(v8Object, isolate, name, member->valueSequenceDouble());
+            break;
+        case WebRTCStatsMemberTypeSequenceString:
+            success &= addPropertySequenceOfStrings(v8Object, isolate, name, member->valueSequenceString());
+            break;
+        default:
+            NOTREACHED();
+        }
+    }
+    if (!success) {
+        NOTREACHED();
+        return v8::Undefined(isolate);
+    }
+    return v8Object;
+}
+
+class RTCStatsReportIterationSource final : public PairIterable<String, v8::Local<v8::Value>>::IterationSource {
+public:
+    RTCStatsReportIterationSource(std::unique_ptr<WebRTCStatsReport> report)
+        : m_report(std::move(report))
+    {
+    }
+
+    bool next(ScriptState* scriptState, String& key, v8::Local<v8::Value>& value, ExceptionState& exceptionState) override
+    {
+        std::unique_ptr<WebRTCStats> stats = m_report->next();
+        if (!stats)
+            return false;
+        key = stats->id();
+        value = webRTCStatsToValue(scriptState, stats.get());
+        return true;
+    }
+
+private:
+    std::unique_ptr<WebRTCStatsReport> m_report;
+};
+
+} // namespace
+
+RTCStatsReport::RTCStatsReport(std::unique_ptr<WebRTCStatsReport> report)
+    : m_report(std::move(report))
+{
+}
+
+PairIterable<String, v8::Local<v8::Value>>::IterationSource* RTCStatsReport::startIteration(ScriptState*, ExceptionState&)
+{
+    return new RTCStatsReportIterationSource(m_report->copyHandle());
+}
+
+bool RTCStatsReport::getMapEntry(ScriptState* scriptState, const String& key, v8::Local<v8::Value>& value, ExceptionState&)
+{
+    std::unique_ptr<WebRTCStats> stats = m_report->getStats(key);
+    if (!stats)
+        return false;
+    value = webRTCStatsToValue(scriptState, stats.get());
+    return true;
+}
+
+} // namespace blink