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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef CHANNEL_HPP
#define CHANNEL_HPP
#include "drill/common.hpp"
#include "drill/drillClient.hpp"
#include "streamSocket.hpp"
namespace Drill {
class UserProperties;
class ConnectionEndpoint{
public:
ConnectionEndpoint(const char* connStr);
ConnectionEndpoint(const char* host, const char* port);
~ConnectionEndpoint();
//parse the connection string and set up the host and port to connect to
connectionStatus_t getDrillbitEndpoint();
const std::string& getProtocol() const {return m_protocol;}
const std::string& getHost() const {return m_host;}
const std::string& getPort() const {return m_port;}
DrillClientError* getError(){ return m_pError;};
private:
void parseConnectString();
bool isDirectConnection();
bool isZookeeperConnection();
connectionStatus_t getDrillbitEndpointFromZk();
connectionStatus_t handleError(connectionStatus_t status, std::string msg);
std::string m_connectString;
std::string m_pathToDrill;
std::string m_protocol;
std::string m_hostPortStr;
std::string m_host;
std::string m_port;
DrillClientError* m_pError;
};
class ChannelContext{
public:
ChannelContext(DrillUserProperties* props):m_properties(props){};
virtual ~ChannelContext(){};
const DrillUserProperties* getUserProperties() const { return m_properties;}
protected:
DrillUserProperties* m_properties;
};
class SSLChannelContext: public ChannelContext{
public:
static boost::asio::ssl::context::method getTlsVersion(const std::string & version){
if (version == "tlsv12") {
return boost::asio::ssl::context::tlsv12;
} else if (version == "tlsv11") {
return boost::asio::ssl::context::tlsv11;
} else if (version == "tlsv1") {
return boost::asio::ssl::context::tlsv1;
} else {
return boost::asio::ssl::context::tlsv12;
}
}
SSLChannelContext(DrillUserProperties *props,
boost::asio::ssl::context::method tlsVersion,
boost::asio::ssl::verify_mode verifyMode) :
ChannelContext(props),
m_SSLContext(tlsVersion) {
m_SSLContext.set_default_verify_paths();
m_SSLContext.set_options(
boost::asio::ssl::context::default_workarounds
| boost::asio::ssl::context::no_sslv2
| boost::asio::ssl::context::single_dh_use
);
m_SSLContext.set_verify_mode(verifyMode);
};
~SSLChannelContext(){};
boost::asio::ssl::context& getSslContext(){ return m_SSLContext;}
private:
boost::asio::ssl::context m_SSLContext;
};
typedef ChannelContext ChannelContext_t;
typedef SSLChannelContext SSLChannelContext_t;
/***
* The Channel class encapsulates a connection to a drillbit. Based on
* the connection string and the options, the connection will be either
* a simple socket or a socket using an ssl stream. The class also encapsulates
* connecting to a drillbit directly or thru zookeeper.
* The channel class owns the socket and the io_service that the applications
* will use to communicate with the server.
***/
class Channel{
friend class ChannelFactory;
public:
Channel(boost::asio::io_service& ioService, const char* connStr);
Channel(boost::asio::io_service& ioService, const char* host, const char* port);
virtual ~Channel();
virtual connectionStatus_t init()=0;
connectionStatus_t connect();
bool isConnected(){ return m_state == CHANNEL_CONNECTED;}
template <typename SettableSocketOption> void setOption(SettableSocketOption& option);
DrillClientError* getError(){ return m_pError;}
void close(){
if(m_state==CHANNEL_INITIALIZED||m_state==CHANNEL_CONNECTED){
m_pSocket->protocolClose();
m_state=CHANNEL_CLOSED;
}
} // Not OK to use the channel after this call.
boost::asio::io_service& getIOService(){
return m_ioService;
}
// returns a reference to the underlying socket
// This access should really be removed and encapsulated in calls that
// manage async_send and async_recv
// Until then we will let DrillClientImpl have direct access
streamSocket_t& getInnerSocket(){
return m_pSocket->getInnerSocket();
}
AsioStreamSocket& getSocketStream(){
return *m_pSocket;
}
ConnectionEndpoint* getEndpoint(){return m_pEndpoint;}
protected:
connectionStatus_t handleError(connectionStatus_t status, std::string msg);
boost::asio::io_service& m_ioService;
boost::asio::io_service m_ioServiceFallback; // used if m_ioService is not provided
AsioStreamSocket* m_pSocket;
ConnectionEndpoint *m_pEndpoint;
ChannelContext_t *m_pContext;
private:
typedef enum channelState{
CHANNEL_UNINITIALIZED=1,
CHANNEL_INITIALIZED,
CHANNEL_CONNECTED,
CHANNEL_CLOSED
} channelState_t;
connectionStatus_t connectInternal();
connectionStatus_t protocolHandshake(bool useSystemConfig){
connectionStatus_t status = CONN_SUCCESS;
try{
m_pSocket->protocolHandshake(useSystemConfig);
} catch (boost::system::system_error e) {
status = handleError(CONN_HANDSHAKE_FAILED, e.what());
}
return status;
}
channelState_t m_state;
DrillClientError* m_pError;
};
class SocketChannel: public Channel{
public:
SocketChannel(boost::asio::io_service& ioService, const char* connStr)
:Channel(ioService, connStr){
}
SocketChannel(boost::asio::io_service& ioService, const char* host, const char* port)
:Channel(ioService, host, port){
}
connectionStatus_t init();
};
class SSLStreamChannel: public Channel{
public:
SSLStreamChannel(boost::asio::io_service& ioService, const char* connStr)
:Channel(ioService, connStr){
}
SSLStreamChannel(boost::asio::io_service& ioService, const char* host, const char* port)
:Channel(ioService, host, port){
}
connectionStatus_t init();
};
class ChannelFactory{
public:
static Channel* getChannel(channelType_t t,
boost::asio::io_service& ioService,
const char* connStr, DrillUserProperties* props);
static Channel* getChannel(channelType_t t,
boost::asio::io_service& ioService,
const char* host,
const char* port,
DrillUserProperties* props);
private:
static ChannelContext_t* getChannelContext(channelType_t t, DrillUserProperties* props);
};
} // namespace Drill
#endif // CHANNEL_HPP
|
