mirror of https://github.com/aria2/aria2
252 lines
7.2 KiB
C++
252 lines
7.2 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2012 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "WebSocketSession.h"
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#include <cerrno>
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#include <cstring>
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#include "SocketCore.h"
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#include "LogFactory.h"
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#include "RecoverableException.h"
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#include "message.h"
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#include "DownloadEngine.h"
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#include "rpc_helper.h"
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#include "RpcResponse.h"
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#include "json.h"
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namespace aria2 {
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namespace rpc {
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namespace {
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ssize_t sendCallback(wslay_event_context_ptr wsctx,
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const uint8_t* data, size_t len, int flags,
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void* userData)
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{
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WebSocketSession* session = reinterpret_cast<WebSocketSession*>(userData);
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const SharedHandle<SocketCore>& socket = session->getSocket();
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try {
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ssize_t r = socket->writeData(data, len);
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if(r == 0) {
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if(socket->wantRead() || socket->wantWrite()) {
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wslay_event_set_error(wsctx, WSLAY_ERR_WOULDBLOCK);
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} else {
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wslay_event_set_error(wsctx, WSLAY_ERR_CALLBACK_FAILURE);
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}
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r = -1;
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}
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return r;
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} catch(RecoverableException& e) {
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A2_LOG_DEBUG_EX(EX_EXCEPTION_CAUGHT, e);
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wslay_event_set_error(wsctx, WSLAY_ERR_CALLBACK_FAILURE);
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return -1;
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}
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}
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} // namespace
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namespace {
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ssize_t recvCallback(wslay_event_context_ptr wsctx,
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uint8_t* buf, size_t len, int flags,
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void* userData)
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{
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WebSocketSession* session = reinterpret_cast<WebSocketSession*>(userData);
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const SharedHandle<SocketCore>& socket = session->getSocket();
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try {
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ssize_t r;
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socket->readData(buf, len);
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if(len == 0) {
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if(socket->wantRead() || socket->wantWrite()) {
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wslay_event_set_error(wsctx, WSLAY_ERR_WOULDBLOCK);
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} else {
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wslay_event_set_error(wsctx, WSLAY_ERR_CALLBACK_FAILURE);
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}
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r = -1;
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} else {
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r = len;
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}
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return r;
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} catch(RecoverableException& e) {
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A2_LOG_DEBUG_EX(EX_EXCEPTION_CAUGHT, e);
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wslay_event_set_error(wsctx, WSLAY_ERR_CALLBACK_FAILURE);
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return -1;
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}
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}
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} // namespace
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namespace {
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void addResponse(WebSocketSession* wsSession, const RpcResponse& res)
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{
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std::string response = toJson(res, "", false);
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wsSession->addTextMessage(response);
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}
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} // namespace
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namespace {
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void addResponse(WebSocketSession* wsSession,
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const std::vector<RpcResponse>& results)
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{
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std::string response = toJsonBatch(results, "", false);
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wsSession->addTextMessage(response);
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}
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} // namespace
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namespace {
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void onMsgRecvCallback(wslay_event_context_ptr wsctx,
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const struct wslay_event_on_msg_recv_arg* arg,
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void* userData)
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{
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WebSocketSession* wsSession = reinterpret_cast<WebSocketSession*>(userData);
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if(!wslay_is_ctrl_frame(arg->opcode)) {
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// TODO Only process text frame
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SharedHandle<ValueBase> json;
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try {
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json = json::decode(arg->msg, arg->msg_length);
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} catch(RecoverableException& e) {
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A2_LOG_INFO_EX("Failed to parse JSON-RPC request", e);
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RpcResponse res
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(createJsonRpcErrorResponse(-32700, "Parse error.", Null::g()));
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addResponse(wsSession, res);
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return;
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}
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const Dict* jsondict = downcast<Dict>(json);
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if(jsondict) {
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RpcResponse res = processJsonRpcRequest(jsondict,
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wsSession->getDownloadEngine());
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addResponse(wsSession, res);
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} else {
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const List* jsonlist = downcast<List>(json);
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if(jsonlist) {
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// This is batch call
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std::vector<RpcResponse> results;
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for(List::ValueType::const_iterator i = jsonlist->begin(),
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eoi = jsonlist->end(); i != eoi; ++i) {
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const Dict* jsondict = downcast<Dict>(*i);
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if(jsondict) {
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RpcResponse r = processJsonRpcRequest
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(jsondict, wsSession->getDownloadEngine());
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results.push_back(r);
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}
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}
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addResponse(wsSession, results);
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} else {
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RpcResponse res(createJsonRpcErrorResponse
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(-32600, "Invalid Request.", Null::g()));
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addResponse(wsSession, res);
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}
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}
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} else {
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RpcResponse res(createJsonRpcErrorResponse
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(-32600, "Invalid Request.", Null::g()));
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addResponse(wsSession, res);
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}
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}
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} // namespace
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WebSocketSession::WebSocketSession(const SharedHandle<SocketCore>& socket,
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DownloadEngine* e)
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: socket_(socket),
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e_(e)
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{
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wslay_event_callbacks callbacks;
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memset(&callbacks, 0, sizeof(wslay_event_callbacks));
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callbacks.recv_callback = recvCallback;
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callbacks.send_callback = sendCallback;
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callbacks.on_msg_recv_callback = onMsgRecvCallback;
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int r = wslay_event_context_server_init(&wsctx_, &callbacks, this);
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assert(r == 0);
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}
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WebSocketSession::~WebSocketSession()
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{
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wslay_event_context_free(wsctx_);
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}
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bool WebSocketSession::wantRead()
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{
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return wslay_event_want_read(wsctx_);
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}
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bool WebSocketSession::wantWrite()
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{
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return wslay_event_want_write(wsctx_);
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}
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bool WebSocketSession::finish()
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{
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return !wantRead() && !wantWrite();
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}
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int WebSocketSession::onReadEvent()
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{
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if(wslay_event_recv(wsctx_) == 0) {
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return 0;
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} else {
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return -1;
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}
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}
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int WebSocketSession::onWriteEvent()
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{
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if(wslay_event_send(wsctx_) == 0) {
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return 0;
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} else {
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return -1;
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}
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}
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void WebSocketSession::addTextMessage(const std::string& msg)
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{
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// TODO Don't add text message if the size of outbound queue in
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// wsctx_ exceeds certain limit.
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wslay_event_msg arg = {
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WSLAY_TEXT_FRAME, reinterpret_cast<const uint8_t*>(msg.c_str()), msg.size()
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};
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wslay_event_queue_msg(wsctx_, &arg);
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}
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bool WebSocketSession::closeReceived()
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{
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return wslay_event_get_close_received(wsctx_);
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}
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bool WebSocketSession::closeSent()
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{
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return wslay_event_get_close_sent(wsctx_);
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}
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} // namespace rpc
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} // namespace aria2
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