mirror of
https://github.com/mongodb/mongo.git
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291 lines
9.0 KiB
C++
291 lines
9.0 KiB
C++
// message.h
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/* Copyright 2009 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "../util/sock.h"
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#include "../bson/util/atomic_int.h"
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#include "hostandport.h"
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namespace mongo {
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extern bool noUnixSocket;
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class Message;
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class MessagingPort;
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class PiggyBackData;
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typedef AtomicUInt MSGID;
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class Listener {
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public:
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Listener(const string &ip, int p, bool logConnect=true ) : _port(p), _ip(ip), _logConnect(logConnect) { }
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virtual ~Listener() {}
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void initAndListen(); // never returns unless error (start a thread)
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/* spawn a thread, etc., then return */
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virtual void accepted(int sock, const SockAddr& from);
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virtual void accepted(MessagingPort *mp){
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assert(!"You must overwrite one of the accepted methods");
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}
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const int _port;
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private:
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string _ip;
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bool _logConnect;
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};
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class AbstractMessagingPort {
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public:
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virtual ~AbstractMessagingPort() { }
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virtual void reply(Message& received, Message& response, MSGID responseTo) = 0; // like the reply below, but doesn't rely on received.data still being available
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virtual void reply(Message& received, Message& response) = 0;
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virtual HostAndPort remote() const = 0;
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virtual unsigned remotePort() const = 0;
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};
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class MessagingPort : public AbstractMessagingPort {
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public:
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MessagingPort(int sock, const SockAddr& farEnd);
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// in some cases the timeout will actually be 2x this value - eg we do a partial send,
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// then the timeout fires, then we try to send again, then the timeout fires again with
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// no data sent, then we detect that the other side is down
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MessagingPort(int timeout = 0, int logLevel = 0 );
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virtual ~MessagingPort();
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void shutdown();
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bool connect(SockAddr& farEnd);
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/* it's assumed if you reuse a message object, that it doesn't cross MessagingPort's.
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also, the Message data will go out of scope on the subsequent recv call.
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*/
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bool recv(Message& m);
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void reply(Message& received, Message& response, MSGID responseTo);
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void reply(Message& received, Message& response);
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bool call(Message& toSend, Message& response);
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void say(Message& toSend, int responseTo = -1);
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void piggyBack( Message& toSend , int responseTo = -1 );
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virtual unsigned remotePort() const;
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virtual HostAndPort remote() const;
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// send len or throw SocketException
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void send( const char * data , int len, const char *context );
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// void send( struct msghdr &meta, const char *context );
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// recv len or throw SocketException
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void recv( char * data , int len );
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int unsafe_recv( char *buf, int max );
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private:
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int sock;
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PiggyBackData * piggyBackData;
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public:
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SockAddr farEnd;
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int _timeout;
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int _logLevel; // passed to log() when logging errors
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friend class PiggyBackData;
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};
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//#pragma pack()
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#pragma pack(1)
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enum Operations {
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opReply = 1, /* reply. responseTo is set. */
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dbMsg = 1000, /* generic msg command followed by a string */
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dbUpdate = 2001, /* update object */
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dbInsert = 2002,
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//dbGetByOID = 2003,
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dbQuery = 2004,
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dbGetMore = 2005,
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dbDelete = 2006,
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dbKillCursors = 2007
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};
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bool doesOpGetAResponse( int op );
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inline const char * opToString( int op ){
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switch ( op ){
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case 0: return "none";
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case opReply: return "reply";
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case dbMsg: return "msg";
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case dbUpdate: return "update";
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case dbInsert: return "insert";
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case dbQuery: return "query";
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case dbGetMore: return "getmore";
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case dbDelete: return "remove";
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case dbKillCursors: return "killcursors";
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default:
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PRINT(op);
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assert(0);
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return "";
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}
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}
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struct MsgData {
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int len; /* len of the msg, including this field */
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MSGID id; /* request/reply id's match... */
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MSGID responseTo; /* id of the message we are responding to */
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int _operation;
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int operation() const {
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return _operation;
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}
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void setOperation(int o) {
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_operation = o;
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}
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char _data[4];
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int& dataAsInt() {
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return *((int *) _data);
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}
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bool valid(){
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if ( len <= 0 || len > ( 1024 * 1024 * 10 ) )
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return false;
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if ( _operation < 0 || _operation > 100000 )
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return false;
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return true;
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}
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int dataLen(); // len without header
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};
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const int MsgDataHeaderSize = sizeof(MsgData) - 4;
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inline int MsgData::dataLen() {
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return len - MsgDataHeaderSize;
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}
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#pragma pack()
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class Message {
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public:
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Message() {
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_freeIt = false;
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}
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Message( void * data , bool freeIt ) {
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_setData( reinterpret_cast< MsgData* >( data ), freeIt );
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};
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~Message() {
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reset();
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}
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SockAddr _from;
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MsgData *header() const { return reinterpret_cast< MsgData* > ( _data[ 0 ].first ); }
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int operation() const { return header()->operation(); }
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MsgData *singleData() const {
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massert( 13273, "single data buffer expected", _data.size() == 1 );
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return header();
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}
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const vector< pair< char *, int > > &allData() const { return _data; }
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bool empty() const { return _data.empty(); }
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// concat multiple buffers - noop if <2 buffers already, otherwise can be expensive copy
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// can get rid of this if we make response handling smarter
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void concat() {
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if ( _data.size() < 2 ) {
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return;
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}
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assert( _freeIt );
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int totalSize = 0;
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for( vector< pair< char *, int > >::const_iterator i = _data.begin(); i != _data.end(); ++i ) {
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totalSize += i->second;
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}
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char *buf = (char*)malloc( totalSize );
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char *p = buf;
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for( vector< pair< char *, int > >::const_iterator i = _data.begin(); i != _data.end(); ++i ) {
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memcpy( p, i->first, i->second );
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p += i->second;
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}
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reset();
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setData( reinterpret_cast< MsgData* >( buf ), true );
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}
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Message& operator=(Message& r) {
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assert( _data.empty() );
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assert( r._freeIt );
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_data = r._data;
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r._freeIt = false;
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r._data.clear();
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_freeIt = true;
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return *this;
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}
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void reset() {
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if ( _freeIt ) {
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for( vector< pair< char *, int > >::const_iterator i = _data.begin(); i != _data.end(); ++i ) {
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free(i->first);
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}
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}
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_data.clear();
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_freeIt = false;
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}
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void setData(MsgData *d, bool freeIt) {
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assert( _data.empty() );
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_setData( d, freeIt );
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}
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void setData(int operation, const char *msgtxt) {
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setData(operation, msgtxt, strlen(msgtxt)+1);
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}
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void setData(int operation, const char *msgdata, size_t len) {
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assert( _data.empty() );
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size_t dataLen = len + sizeof(MsgData) - 4;
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MsgData *d = (MsgData *) malloc(dataLen);
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memcpy(d->_data, msgdata, len);
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d->len = fixEndian(dataLen);
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d->setOperation(operation);
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_setData( d, true );
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}
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bool doIFreeIt() {
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return _freeIt;
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}
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private:
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void _setData( MsgData *d, bool freeIt ) {
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_freeIt = freeIt;
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_data.push_back( make_pair( reinterpret_cast< char * >( d ), d->len ) );
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}
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// byte buffer(s) - the first must contain at least a full MsgData
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vector< pair< char*, int > > _data;
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bool _freeIt;
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};
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class SocketException : public DBException {
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public:
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virtual const char* what() const throw() { return "socket exception"; }
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virtual int getCode() const { return 9001; }
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};
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MSGID nextMessageId();
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void setClientId( int id );
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int getClientId();
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extern TicketHolder connTicketHolder;
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} // namespace mongo
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