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// message.h
/* Copyright 2009 10gen Inc.
*
* Licensed 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.
*/
#pragma once
#include "../util/sock.h"
#include "../util/atomic_int.h"
namespace mongo {
class Message;
class MessagingPort;
class PiggyBackData;
typedef AtomicUInt MSGID;
class Listener {
public:
Listener(const string &_ip, int p) : ip(_ip), port(p) { }
virtual ~Listener() {}
bool init(); // set up socket
int socket() const { return sock; }
void listen(); // never returns (start a thread)
/* spawn a thread, etc., then return */
virtual void accepted(MessagingPort *mp) = 0;
private:
string ip;
int port;
int sock;
};
class AbstractMessagingPort {
public:
virtual ~AbstractMessagingPort() { }
virtual void reply(Message& received, Message& response, MSGID responseTo) = 0; // like the reply below, but doesn't rely on received.data still being available
virtual void reply(Message& received, Message& response) = 0;
virtual unsigned remotePort() = 0 ;
};
class MessagingPort : public AbstractMessagingPort {
public:
MessagingPort(int sock, SockAddr& farEnd);
MessagingPort();
virtual ~MessagingPort();
void shutdown();
bool connect(SockAddr& farEnd);
/* it's assumed if you reuse a message object, that it doesn't cross MessagingPort's.
also, the Message data will go out of scope on the subsequent recv call.
*/
bool recv(Message& m);
void reply(Message& received, Message& response, MSGID responseTo);
void reply(Message& received, Message& response);
bool call(Message& toSend, Message& response);
void say(Message& toSend, int responseTo = -1);
void piggyBack( Message& toSend , int responseTo = -1 );
virtual unsigned remotePort();
int send( const char * data , const int len );
int recv( char * data , int max );
private:
int sock;
PiggyBackData * piggyBackData;
public:
SockAddr farEnd;
friend class PiggyBackData;
};
//#pragma pack()
#pragma pack(1)
enum Operations {
opReply = 1, /* reply. responseTo is set. */
dbMsg = 1000, /* generic msg command followed by a string */
dbUpdate = 2001, /* update object */
dbInsert = 2002,
//dbGetByOID = 2003,
dbQuery = 2004,
dbGetMore = 2005,
dbDelete = 2006,
dbKillCursors = 2007
};
bool doesOpGetAResponse( int op );
inline const char * opToString( int op ){
switch ( op ){
case 0: return "none";
case opReply: return "reply";
case dbMsg: return "msg";
case dbUpdate: return "update";
case dbInsert: return "insert";
case dbQuery: return "query";
case dbGetMore: return "getmore";
case dbDelete: return "remove";
case dbKillCursors: return "killcursors";
default:
PRINT(op);
assert(0);
return "";
}
}
struct MsgData {
int len; /* len of the msg, including this field */
MSGID id; /* request/reply id's match... */
MSGID responseTo; /* id of the message we are responding to */
int _operation;
int operation() const {
return _operation;
}
void setOperation(int o) {
_operation = o;
}
char _data[4];
int& dataAsInt() {
return *((int *) _data);
}
bool valid(){
if ( len <= 0 || len > ( 1024 * 1024 * 10 ) )
return false;
if ( _operation < 0 || _operation > 100000 )
return false;
return true;
}
int dataLen(); // len without header
};
const int MsgDataHeaderSize = sizeof(MsgData) - 4;
inline int MsgData::dataLen() {
return len - MsgDataHeaderSize;
}
#pragma pack()
class Message {
public:
Message() {
data = 0;
freeIt = false;
}
Message( void * _data , bool _freeIt ) {
data = (MsgData*)_data;
freeIt = _freeIt;
};
~Message() {
reset();
}
SockAddr from;
MsgData *data;
Message& operator=(Message& r) {
assert( data == 0 );
data = r.data;
assert( r.freeIt );
r.freeIt = false;
r.data = 0;
freeIt = true;
return *this;
}
void reset() {
if ( freeIt && data )
free(data);
data = 0;
freeIt = false;
}
void setData(MsgData *d, bool _freeIt) {
assert( data == 0 );
freeIt = _freeIt;
data = d;
}
void setData(int operation, const char *msgtxt) {
setData(operation, msgtxt, strlen(msgtxt)+1);
}
void setData(int operation, const char *msgdata, size_t len) {
assert(data == 0);
size_t dataLen = len + sizeof(MsgData) - 4;
MsgData *d = (MsgData *) malloc(dataLen);
memcpy(d->_data, msgdata, len);
d->len = fixEndian(dataLen);
d->setOperation(operation);
freeIt= true;
data = d;
}
bool doIFreeIt() {
return freeIt;
}
private:
bool freeIt;
};
class SocketException : public DBException {
public:
virtual const char* what() const throw() { return "socket exception"; }
virtual int getCode(){ return 9001; }
};
MSGID nextMessageId();
void setClientId( int id );
int getClientId();
} // namespace mongo
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