blob: b08947aba43f32c1da32a290560dcbd32471e306 [file] [log] [blame]
// 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 "DispatcherBase.h"
//#include "Parser.h"
{% for namespace in config.protocol.namespace %}
namespace {{namespace}} {
{% endfor %}
// static
DispatchResponse DispatchResponse::OK()
{
DispatchResponse result;
result.m_status = kSuccess;
result.m_errorCode = kParseError;
return result;
}
// static
DispatchResponse DispatchResponse::Error(const String& error)
{
DispatchResponse result;
result.m_status = kError;
result.m_errorCode = kServerError;
result.m_errorMessage = error;
return result;
}
// static
DispatchResponse DispatchResponse::InternalError()
{
DispatchResponse result;
result.m_status = kError;
result.m_errorCode = kInternalError;
result.m_errorMessage = "Internal error";
return result;
}
// static
DispatchResponse DispatchResponse::InvalidParams(const String& error)
{
DispatchResponse result;
result.m_status = kError;
result.m_errorCode = kInvalidParams;
result.m_errorMessage = error;
return result;
}
// static
DispatchResponse DispatchResponse::FallThrough()
{
DispatchResponse result;
result.m_status = kFallThrough;
result.m_errorCode = kParseError;
return result;
}
// static
const char DispatcherBase::kInvalidParamsString[] = "Invalid parameters";
DispatcherBase::WeakPtr::WeakPtr(DispatcherBase* dispatcher) : m_dispatcher(dispatcher) { }
DispatcherBase::WeakPtr::~WeakPtr()
{
if (m_dispatcher)
m_dispatcher->m_weakPtrs.erase(this);
}
DispatcherBase::Callback::Callback(std::unique_ptr<DispatcherBase::WeakPtr> backendImpl, int callId, int callbackId)
: m_backendImpl(std::move(backendImpl))
, m_callId(callId)
, m_callbackId(callbackId) { }
DispatcherBase::Callback::~Callback() = default;
void DispatcherBase::Callback::dispose()
{
m_backendImpl = nullptr;
}
void DispatcherBase::Callback::sendIfActive(std::unique_ptr<protocol::DictionaryValue> partialMessage, const DispatchResponse& response)
{
if (!m_backendImpl || !m_backendImpl->get())
return;
m_backendImpl->get()->sendResponse(m_callId, response, std::move(partialMessage));
m_backendImpl = nullptr;
}
void DispatcherBase::Callback::fallThroughIfActive()
{
if (!m_backendImpl || !m_backendImpl->get())
return;
m_backendImpl->get()->markFallThrough(m_callbackId);
m_backendImpl = nullptr;
}
DispatcherBase::DispatcherBase(FrontendChannel* frontendChannel)
: m_frontendChannel(frontendChannel)
, m_lastCallbackId(0)
, m_lastCallbackFallThrough(false) { }
DispatcherBase::~DispatcherBase()
{
clearFrontend();
}
int DispatcherBase::nextCallbackId()
{
m_lastCallbackFallThrough = false;
return ++m_lastCallbackId;
}
void DispatcherBase::markFallThrough(int callbackId)
{
DCHECK(callbackId == m_lastCallbackId);
m_lastCallbackFallThrough = true;
}
// static
bool DispatcherBase::getCommandName(const String& message, String* result)
{
std::unique_ptr<protocol::Value> value = StringUtil::parseJSON(message);
if (!value)
return false;
protocol::DictionaryValue* object = DictionaryValue::cast(value.get());
if (!object)
return false;
if (!object->getString("method", result))
return false;
return true;
}
void DispatcherBase::sendResponse(int callId, const DispatchResponse& response, std::unique_ptr<protocol::DictionaryValue> result)
{
if (response.status() == DispatchResponse::kError) {
reportProtocolError(callId, response.errorCode(), response.errorMessage(), nullptr);
return;
}
std::unique_ptr<protocol::DictionaryValue> responseMessage = DictionaryValue::create();
responseMessage->setInteger("id", callId);
responseMessage->setObject("result", std::move(result));
if (m_frontendChannel)
m_frontendChannel->sendProtocolResponse(callId, responseMessage->toJSONString());
}
void DispatcherBase::sendResponse(int callId, const DispatchResponse& response)
{
sendResponse(callId, response, DictionaryValue::create());
}
static void reportProtocolErrorTo(FrontendChannel* frontendChannel, int callId, DispatchResponse::ErrorCode code, const String& errorMessage, ErrorSupport* errors)
{
if (!frontendChannel)
return;
std::unique_ptr<protocol::DictionaryValue> error = DictionaryValue::create();
error->setInteger("code", code);
error->setString("message", errorMessage);
if (errors && errors->hasErrors())
error->setString("data", errors->errors());
std::unique_ptr<protocol::DictionaryValue> message = DictionaryValue::create();
message->setObject("error", std::move(error));
message->setInteger("id", callId);
frontendChannel->sendProtocolResponse(callId, message->toJSONString());
}
static void reportProtocolErrorTo(FrontendChannel* frontendChannel, DispatchResponse::ErrorCode code, const String& errorMessage)
{
if (!frontendChannel)
return;
std::unique_ptr<protocol::DictionaryValue> error = DictionaryValue::create();
error->setInteger("code", code);
error->setString("message", errorMessage);
std::unique_ptr<protocol::DictionaryValue> message = DictionaryValue::create();
message->setObject("error", std::move(error));
frontendChannel->sendProtocolNotification(message->toJSONString());
}
void DispatcherBase::reportProtocolError(int callId, DispatchResponse::ErrorCode code, const String& errorMessage, ErrorSupport* errors)
{
reportProtocolErrorTo(m_frontendChannel, callId, code, errorMessage, errors);
}
void DispatcherBase::clearFrontend()
{
m_frontendChannel = nullptr;
for (auto& weak : m_weakPtrs)
weak->dispose();
m_weakPtrs.clear();
}
std::unique_ptr<DispatcherBase::WeakPtr> DispatcherBase::weakPtr()
{
std::unique_ptr<DispatcherBase::WeakPtr> weak(new DispatcherBase::WeakPtr(this));
m_weakPtrs.insert(weak.get());
return weak;
}
UberDispatcher::UberDispatcher(FrontendChannel* frontendChannel)
: m_frontendChannel(frontendChannel)
, m_fallThroughForNotFound(false) { }
void UberDispatcher::setFallThroughForNotFound(bool fallThroughForNotFound)
{
m_fallThroughForNotFound = fallThroughForNotFound;
}
void UberDispatcher::registerBackend(const String& name, std::unique_ptr<protocol::DispatcherBase> dispatcher)
{
m_dispatchers[name] = std::move(dispatcher);
}
DispatchResponse::Status UberDispatcher::dispatch(std::unique_ptr<Value> parsedMessage)
{
if (!parsedMessage) {
reportProtocolErrorTo(m_frontendChannel, DispatchResponse::kParseError, "Message must be a valid JSON");
return DispatchResponse::kError;
}
std::unique_ptr<protocol::DictionaryValue> messageObject = DictionaryValue::cast(std::move(parsedMessage));
if (!messageObject) {
reportProtocolErrorTo(m_frontendChannel, DispatchResponse::kInvalidRequest, "Message must be an object");
return DispatchResponse::kError;
}
int callId = 0;
protocol::Value* callIdValue = messageObject->get("id");
bool success = callIdValue && callIdValue->asInteger(&callId);
if (!success) {
reportProtocolErrorTo(m_frontendChannel, DispatchResponse::kInvalidRequest, "Message must have integer 'id' porperty");
return DispatchResponse::kError;
}
protocol::Value* methodValue = messageObject->get("method");
String method;
success = methodValue && methodValue->asString(&method);
if (!success) {
reportProtocolErrorTo(m_frontendChannel, callId, DispatchResponse::kInvalidRequest, "Message must have string 'method' porperty", nullptr);
return DispatchResponse::kError;
}
size_t dotIndex = method.find(".");
if (dotIndex == StringUtil::kNotFound) {
if (m_fallThroughForNotFound)
return DispatchResponse::kFallThrough;
reportProtocolErrorTo(m_frontendChannel, callId, DispatchResponse::kMethodNotFound, "'" + method + "' wasn't found", nullptr);
return DispatchResponse::kError;
}
String domain = StringUtil::substring(method, 0, dotIndex);
auto it = m_dispatchers.find(domain);
if (it == m_dispatchers.end()) {
if (m_fallThroughForNotFound)
return DispatchResponse::kFallThrough;
reportProtocolErrorTo(m_frontendChannel, callId, DispatchResponse::kMethodNotFound, "'" + method + "' wasn't found", nullptr);
return DispatchResponse::kError;
}
return it->second->dispatch(callId, method, std::move(messageObject));
}
UberDispatcher::~UberDispatcher() = default;
{% for namespace in config.protocol.namespace %}
} // namespace {{namespace}}
{% endfor %}