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// Copyright (c) 2012 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 "content/renderer/media/rtc_data_channel_handler.h"
#include <limits>
#include <string>
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/strings/utf_string_conversions.h"
namespace content {
namespace {
enum DataChannelCounters {
CHANNEL_CREATED,
CHANNEL_OPENED,
CHANNEL_RELIABLE,
CHANNEL_ORDERED,
CHANNEL_NEGOTIATED,
CHANNEL_BOUNDARY
};
void IncrementCounter(DataChannelCounters counter) {
UMA_HISTOGRAM_ENUMERATION("WebRTC.DataChannelCounters",
counter,
CHANNEL_BOUNDARY);
}
} // namespace
RtcDataChannelHandler::RtcDataChannelHandler(
webrtc::DataChannelInterface* channel)
: channel_(channel),
webkit_client_(NULL) {
DVLOG(1) << "::ctor";
channel_->RegisterObserver(this);
IncrementCounter(CHANNEL_CREATED);
if (isReliable())
IncrementCounter(CHANNEL_RELIABLE);
if (ordered())
IncrementCounter(CHANNEL_ORDERED);
if (negotiated())
IncrementCounter(CHANNEL_NEGOTIATED);
UMA_HISTOGRAM_CUSTOM_COUNTS("WebRTC.DataChannelMaxRetransmits",
maxRetransmits(), 0,
std::numeric_limits<unsigned short>::max(), 50);
UMA_HISTOGRAM_CUSTOM_COUNTS("WebRTC.DataChannelMaxRetransmitTime",
maxRetransmitTime(), 0,
std::numeric_limits<unsigned short>::max(), 50);
}
RtcDataChannelHandler::~RtcDataChannelHandler() {
DVLOG(1) << "::dtor";
channel_->UnregisterObserver();
}
void RtcDataChannelHandler::setClient(
blink::WebRTCDataChannelHandlerClient* client) {
webkit_client_ = client;
}
blink::WebString RtcDataChannelHandler::label() {
return base::UTF8ToUTF16(channel_->label());
}
bool RtcDataChannelHandler::isReliable() {
return channel_->reliable();
}
bool RtcDataChannelHandler::ordered() const {
return channel_->ordered();
}
unsigned short RtcDataChannelHandler::maxRetransmitTime() const {
return channel_->maxRetransmitTime();
}
unsigned short RtcDataChannelHandler::maxRetransmits() const {
return channel_->maxRetransmits();
}
blink::WebString RtcDataChannelHandler::protocol() const {
return base::UTF8ToUTF16(channel_->protocol());
}
bool RtcDataChannelHandler::negotiated() const {
return channel_->negotiated();
}
unsigned short RtcDataChannelHandler::id() const {
return channel_->id();
}
unsigned long RtcDataChannelHandler::bufferedAmount() {
return channel_->buffered_amount();
}
bool RtcDataChannelHandler::sendStringData(const blink::WebString& data) {
std::string utf8_buffer = base::UTF16ToUTF8(data);
rtc::Buffer buffer(utf8_buffer.c_str(), utf8_buffer.length());
webrtc::DataBuffer data_buffer(buffer, false);
RecordMessageSent(data_buffer.size());
return channel_->Send(data_buffer);
}
bool RtcDataChannelHandler::sendRawData(const char* data, size_t length) {
rtc::Buffer buffer(data, length);
webrtc::DataBuffer data_buffer(buffer, true);
RecordMessageSent(data_buffer.size());
return channel_->Send(data_buffer);
}
void RtcDataChannelHandler::close() {
channel_->Close();
}
void RtcDataChannelHandler::OnStateChange() {
if (!webkit_client_) {
LOG(ERROR) << "WebRTCDataChannelHandlerClient not set.";
return;
}
DVLOG(1) << "OnStateChange " << channel_->state();
switch (channel_->state()) {
case webrtc::DataChannelInterface::kConnecting:
webkit_client_->didChangeReadyState(
blink::WebRTCDataChannelHandlerClient::ReadyStateConnecting);
break;
case webrtc::DataChannelInterface::kOpen:
IncrementCounter(CHANNEL_OPENED);
webkit_client_->didChangeReadyState(
blink::WebRTCDataChannelHandlerClient::ReadyStateOpen);
break;
case webrtc::DataChannelInterface::kClosing:
webkit_client_->didChangeReadyState(
blink::WebRTCDataChannelHandlerClient::ReadyStateClosing);
break;
case webrtc::DataChannelInterface::kClosed:
webkit_client_->didChangeReadyState(
blink::WebRTCDataChannelHandlerClient::ReadyStateClosed);
break;
default:
NOTREACHED();
break;
}
}
void RtcDataChannelHandler::OnMessage(const webrtc::DataBuffer& buffer) {
if (!webkit_client_) {
LOG(ERROR) << "WebRTCDataChannelHandlerClient not set.";
return;
}
if (buffer.binary) {
webkit_client_->didReceiveRawData(buffer.data.data(), buffer.data.length());
} else {
base::string16 utf16;
if (!base::UTF8ToUTF16(buffer.data.data(), buffer.data.length(), &utf16)) {
LOG(ERROR) << "Failed convert received data to UTF16";
return;
}
webkit_client_->didReceiveStringData(utf16);
}
}
void RtcDataChannelHandler::RecordMessageSent(size_t num_bytes) {
// Currently, messages are capped at some fairly low limit (16 Kb?)
// but we may allow unlimited-size messages at some point, so making
// the histogram maximum quite large (100 Mb) to have some
// granularity at the higher end in that eventuality. The histogram
// buckets are exponentially growing in size, so we'll still have
// good granularity at the low end.
// This makes the last bucket in the histogram count messages from
// 100 Mb to infinity.
const int kMaxBucketSize = 100 * 1024 * 1024;
const int kNumBuckets = 50;
if (isReliable()) {
UMA_HISTOGRAM_CUSTOM_COUNTS("WebRTC.ReliableDataChannelMessageSize",
num_bytes,
1, kMaxBucketSize, kNumBuckets);
} else {
UMA_HISTOGRAM_CUSTOM_COUNTS("WebRTC.UnreliableDataChannelMessageSize",
num_bytes,
1, kMaxBucketSize, kNumBuckets);
}
}
} // namespace content
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