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javascript_callback.cpp
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106 lines (99 loc) · 3.88 KB
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// Copyright (c) 2013 CEF Python, see the Authors file.
// All rights reserved. Licensed under BSD 3-clause license.
// Project website: https://github.com/cztomczak/cefpython
#include "javascript_callback.h"
#include <map>
#include <sstream>
#include "v8utils.h"
#include "cefpython_app.h"
#include "include/base/cef_logging.h"
template<typename T>
inline std::string AnyToString(const T& value)
{
std::ostringstream oss;
oss << value;
return oss.str();
}
typedef std::map<int,
std::pair<CefRefPtr<CefFrame>, CefRefPtr<CefV8Value> > >
JavascriptCallbackMap;
JavascriptCallbackMap g_jsCallbackMap;
int g_jsCallbackMaxId = 0;
CefString PutJavascriptCallback(
CefRefPtr<CefFrame> frame, CefRefPtr<CefV8Value> jsCallback) {
// Returns a "####cefpython####" string followed by json encoded data.
// {"what":"javascript-callback","callbackId":123,
// "frameId":123,"functionName":"xx"}
int callbackId = ++g_jsCallbackMaxId;
int64 frameId = frame->GetIdentifier();
CefString functionName = jsCallback->GetFunctionName();
std::string strCallbackId = "####cefpython####";
strCallbackId.append("{");
// JSON format allows only for double quotes.
strCallbackId.append("\"what\":\"javascript-callback\"");
strCallbackId.append(",\"callbackId\":").append(AnyToString(callbackId));
strCallbackId.append(",\"frameId\":").append(AnyToString(frameId));
strCallbackId.append(",\"functionName\":\"").append(functionName) \
.append("\"");
strCallbackId.append("}");
g_jsCallbackMap.insert(std::make_pair(
callbackId,
std::make_pair(frame, jsCallback)));
return strCallbackId;
}
bool ExecuteJavascriptCallback(int callbackId, CefRefPtr<CefListValue> args) {
if (g_jsCallbackMap.empty()) {
LOG(ERROR) << "[Renderer process] ExecuteJavascriptCallback():"
" callback map is empty";
return false;
}
JavascriptCallbackMap::const_iterator it = g_jsCallbackMap.find(
callbackId);
if (it == g_jsCallbackMap.end()) {
std::string logMessage = "[Renderer process]"
" ExecuteJavascriptCallback():"
" callback not found, id=";
logMessage.append(AnyToString(callbackId));
LOG(ERROR) << logMessage.c_str();
return false;
}
CefRefPtr<CefFrame> frame = it->second.first;
CefRefPtr<CefV8Value> callback = it->second.second;
CefRefPtr<CefV8Context> context = frame->GetV8Context();
context->Enter();
CefV8ValueList v8Arguments = CefListValueToCefV8ValueList(args);
CefRefPtr<CefV8Value> v8ReturnValue = callback->ExecuteFunction(
NULL, v8Arguments);
if (v8ReturnValue.get()) {
context->Exit();
return true;
} else {
context->Exit();
LOG(ERROR) << "[Renderer process] ExecuteJavascriptCallback():"
" callback->ExecuteFunction() failed";
return false;
}
}
void RemoveJavascriptCallbacksForFrame(CefRefPtr<CefFrame> frame) {
if (g_jsCallbackMap.empty()) {
return;
}
JavascriptCallbackMap::iterator it = g_jsCallbackMap.begin();
int64 frameId = frame->GetIdentifier();
while (it != g_jsCallbackMap.end()) {
if (it->second.first->GetIdentifier() == frameId) {
// Pass current iterator and increment it after passing
// to the function, but before erase() is called, this
// is important for it to work in a loop. You can't do this:
// | if (..) erase(it);
// | ++it;
// This would cause an infinite loop.
g_jsCallbackMap.erase(it++);
LOG(INFO) << "[Renderer process]"
" RemoveJavascriptCallbacksForFrame():"
" removed js callback from the map";
} else {
++it;
}
}
}