ecbab12008-07-27Stephen R. van den Berg /* * Some pgsql utility functions. * They are kept here to avoid circular references. * */ #pike __REAL_VERSION__ #include "pgsql.h" #define FLUSH "H\0\0\0\4" //! Some pgsql utility functions class PGassist { int(-1..1) peek(int timeout) { } string read(int len,void|int(0..1) not_all) { } int write(string|array(string) data) { } int getchar() { } int close() { }
4741cd2008-07-31Stephen R. van den Berg  private final array(string) cmdbuf=({});
ecbab12008-07-27Stephen R. van den Berg #ifdef USEPGsql inherit _PGsql.PGsql; #else object portal; void setportal(void|object newportal) { portal=newportal; } inline int(-1..1) bpeek(int timeout) { return peek(timeout); } int flushed=-1; inline final int getbyte() { if(!flushed && !bpeek(0)) sendflush(); return getchar(); } final string getstring(void|int len) { if(!zero_type(len)) { string acc="",res; do { if(!flushed && !bpeek(0)) sendflush(); res=read(len,!flushed); if(res) { if(!sizeof(res)) return acc; acc+=res; } } while(sizeof(acc)<len&&res); return sizeof(acc)?acc:res; } array(int) acc=({}); int c; while((c=getbyte())>0) acc+=({c}); return `+("",@map(acc,String.int2char)); } inline final int getint16() { int s0=getbyte(); int r=(s0&0x7f)<<8|getbyte(); return s0&0x80 ? r-(1<<15) : r ; } inline final int getint32() { int r=getint16(); r=r<<8|getbyte(); return r<<8|getbyte(); } inline final int getint64() { int r=getint32(); return r<<32|getint32()&0xffffffff; } #endif inline final string plugbyte(int x) { return String.int2char(x); } inline final string plugint16(int x) { return sprintf("%c%c",x>>8&255,x&255); } inline final string plugint32(int x) { return sprintf("%c%c%c%c",x>>24&255,x>>16&255,x>>8&255,x&255); } inline final string plugint64(int x) { return sprintf("%c%c%c%c%c%c%c%c",x>>56&255,x>>48&255,x>>40&255,x>>32&255, x>>24&255,x>>16&255,x>>8&255,x&255); } final void sendflush() { sendcmd(({}),1); }
4741cd2008-07-31Stephen R. van den Berg  final void sendcmd(string|array(string) data,void|int flush) { if(arrayp(data)) cmdbuf+=data; else cmdbuf+=({data}); switch(flush) { case 3: cmdbuf+=({FLUSH}); flushed=1; break; default: flushed=0; break; case 1: cmdbuf+=({FLUSH}); PD("Flush\n"); case 2: flushed=1;
cb26232008-08-04Stephen R. van den Berg  { int i=write(cmdbuf); if(portal && portal._pgsqlsess) { portal._pgsqlsess._packetssent++; portal._pgsqlsess._bytessent+=i; } }
4741cd2008-07-31Stephen R. van den Berg  cmdbuf=({});
ecbab12008-07-27Stephen R. van den Berg  } } final void sendterminate() { PD("Terminate\n");
4741cd2008-07-31Stephen R. van den Berg  sendcmd(({"X",plugint32(4)}),2);
ecbab12008-07-27Stephen R. van den Berg  close(); }
d432822008-07-31Stephen R. van den Berg  void create() { #ifdef USEPGsql ::create(); #endif }
ecbab12008-07-27Stephen R. van den Berg } class PGconn { inherit PGassist:pg; #ifdef UNBUFFEREDIO inherit Stdio.File:std; inline int getchar() { return std::read(1)[0]; } #else inherit Stdio.FILE:std; inline int getchar() { return std::getchar(); } #endif inline int(-1..1) peek(int timeout) { return std::peek(timeout); } inline string read(int len,void|int(0..1) not_all) { return std::read(len,not_all); } inline int write(string|array(string) data) { return std::write(data); } int close() { return std::close(); } void create(Stdio.File stream,object t) { std::create(); std::assign(stream);
d432822008-07-31Stephen R. van den Berg  pg::create();
ecbab12008-07-27Stephen R. van den Berg  } } #if constant(SSL.sslfile) class PGconnS { inherit SSL.sslfile:std; inherit PGassist:pg; Stdio.File rawstream; inline int(-1..1) peek(int timeout) {
17b7532008-07-30Stephen R. van den Berg  return rawstream.peek(timeout); // This is a kludge } // Actually SSL.sslfile should provide a peek() method
ecbab12008-07-27Stephen R. van den Berg  inline string read(int len,void|int(0..1) not_all) { return std::read(len,not_all); } inline int write(string|array(string) data) { return std::write(data); } void create(Stdio.File stream, SSL.context ctx) { rawstream=stream; std::create(stream,ctx,1,1);
d432822008-07-31Stephen R. van den Berg  pg::create();
ecbab12008-07-27Stephen R. van den Berg  } } #endif class pgsql_result { object _pgsqlsess; private int numrows; private int eoffound; private mixed delayederror; private int copyinprogress; int _fetchlimit; #ifdef NO_LOCKING int _qmtxkey; #else Thread.MutexKey _qmtxkey; #endif string query; string _portalname; int _bytesreceived; int _rowsreceived; int _interruptable; int _inflight; int _portalbuffersize; string _statuscmdcomplete; array(array(mixed)) _datarows; array(mapping(string:mixed)) _datarowdesc; array(int) _datatypeoid; #ifdef USEPGsql int _buffer; #endif
e064e92008-08-05Stephen R. van den Berg private object fetchmutex;
ecbab12008-07-27Stephen R. van den Berg  protected string _sprintf(int type, void|mapping flags) { string res=UNDEFINED; switch(type) { case 'O': res=sprintf("pgsql_result numrows: %d eof: %d querylock: %d"
17b7532008-07-30Stephen R. van den Berg  " inflight: %d\nportalname: %O datarows: %d\n"
ecbab12008-07-27Stephen R. van den Berg  "query: %O\n"
17b7532008-07-30Stephen R. van den Berg  "laststatus: %s\n", numrows,eoffound,!!_qmtxkey,_inflight, _portalname,sizeof(_datarowdesc),
ecbab12008-07-27Stephen R. van den Berg  query,
17b7532008-07-30Stephen R. van den Berg  _statuscmdcomplete||"");
ecbab12008-07-27Stephen R. van den Berg  break; } return res; }
cb26232008-08-04Stephen R. van den Berg void create(object pgsqlsess,string _query,int fetchlimit, int portalbuffersize) {
ecbab12008-07-27Stephen R. van den Berg  _pgsqlsess = pgsqlsess;
cb26232008-08-04Stephen R. van den Berg  query = _query;
ecbab12008-07-27Stephen R. van den Berg  _datarows = ({ }); numrows = UNDEFINED; fetchmutex = Thread.Mutex(); _fetchlimit=fetchlimit; _portalbuffersize=portalbuffersize; steallock(); } //! Returns the command-complete status for this query. //! //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. //! //! @seealso //! @[affected_rows] string status_command_complete() { return _statuscmdcomplete; } //! Returns the number of affected rows by this query. //! //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. //! //! @seealso //! @[status_command_complete] int affected_rows() { int rows; if(_statuscmdcomplete) sscanf(_statuscmdcomplete,"%*s %d",rows); return rows; } int num_fields() { return sizeof(_datarowdesc); } int num_rows() { int numrows; sscanf(_statuscmdcomplete,"%*s %d",numrows); return numrows; } int eof() { return eoffound; } array(mapping(string:mixed)) fetch_fields() { return _datarowdesc+({}); } private void releasesession() { if(_pgsqlsess) { if(copyinprogress) { PD("CopyDone\n"); _pgsqlsess._c.sendcmd("c\0\0\0\4",1); } _pgsqlsess.reload(2); } _qmtxkey=UNDEFINED; _pgsqlsess=UNDEFINED; } void destroy() { catch { // inside destructors, exceptions don't work releasesession(); }; } inline private array(mixed) getdatarow() { array(mixed) datarow=_datarows[0]; _datarows=_datarows[1..]; return datarow; } private void steallock() { #ifndef NO_LOCKING PD("Going to steal oldportal %d\n",!!_pgsqlsess._c.portal); Thread.MutexKey stealmtxkey = _pgsqlsess._stealmutex.lock(); do if(_qmtxkey = _pgsqlsess._querymutex.current_locking_key()) { pgsql_result portalb; if(portalb=_pgsqlsess._c.portal) { _pgsqlsess._nextportal++; if(portalb->_interruptable) portalb->fetch_row(2); else { PD("Waiting for the querymutex\n"); if((_qmtxkey=_pgsqlsess._querymutex.lock(2))) { if(copyinprogress) error("COPY needs to be finished first\n"); error("Driver bug, please report, " "conflict while interleaving SQL-operations\n"); } PD("Got the querymutex\n"); } _pgsqlsess._nextportal--; } break; } while(!(_qmtxkey=_pgsqlsess._querymutex.trylock())); #else PD("Skipping lock\n"); _qmtxkey=1; #endif _pgsqlsess._c.setportal(this); PD("Stealing successful\n"); } int|array(string|int) fetch_row(void|int|string buffer) { #ifndef NO_LOCKING Thread.MutexKey fetchmtxkey = fetchmutex.lock(); #endif if(!buffer && sizeof(_datarows)) return getdatarow(); if(copyinprogress) { fetchmtxkey = UNDEFINED; if(stringp(buffer)) { PD("CopyData\n"); _pgsqlsess._c.sendcmd(({"d",_pgsqlsess._c.plugint32(4+sizeof(buffer)),
4741cd2008-07-31Stephen R. van den Berg  buffer}),2);
ecbab12008-07-27Stephen R. van den Berg  } else releasesession(); return UNDEFINED; } mixed err; if(buffer!=2 && (err=delayederror)) { delayederror=UNDEFINED; throw(err); } err = catch { if(_portalname) { if(buffer!=2 && !_qmtxkey) { steallock(); _pgsqlsess._sendexecute(_fetchlimit); } while(_pgsqlsess._closesent) _pgsqlsess._decodemsg(); // Flush previous portal sequence for(;;) { #ifdef DEBUGMORE PD("buffer: %d nextportal: %d lock: %d\n", buffer,_pgsqlsess._nextportal,!!_qmtxkey); #endif #ifdef USEPGsql _buffer=buffer; #endif switch(_pgsqlsess._decodemsg()) { case copyinresponse: copyinprogress=1; return UNDEFINED; case dataready: _pgsqlsess._mstate=dataprocessed; _rowsreceived++; switch(buffer) { case 0: case 1: if(_fetchlimit) _fetchlimit= min(_portalbuffersize/2*_rowsreceived/_bytesreceived || 1, _pgsqlsess._fetchlimit); } switch(buffer) { case 2: case 3: continue; case 1: _interruptable=1; if(_pgsqlsess._nextportal) continue; #if STREAMEXECUTES if(_fetchlimit && _inflight<=_fetchlimit-1) _pgsqlsess._sendexecute(_fetchlimit); #endif return UNDEFINED; } #if STREAMEXECUTES if(_fetchlimit && _inflight<=_fetchlimit-1) _pgsqlsess._sendexecute(_fetchlimit); // Overlap Executes #endif return getdatarow(); case commandcomplete: _inflight=0; releasesession(); switch(buffer) { case 1: case 2: return UNDEFINED; case 3: if(sizeof(_datarows)) return getdatarow(); } break; case portalsuspended: if(_inflight) continue; if(_pgsqlsess._nextportal) { switch(buffer) { case 1: case 2: _qmtxkey = UNDEFINED; return UNDEFINED; case 3: _qmtxkey = UNDEFINED; return getdatarow(); } _fetchlimit=FETCHLIMITLONGRUN; if(sizeof(_datarows)) { _qmtxkey = UNDEFINED; return getdatarow(); } buffer=3; } _pgsqlsess._sendexecute(_fetchlimit); default: continue; } break; } } eoffound=1; return UNDEFINED; }; PD("Exception %O\n",err); _pgsqlsess.reload(); if(buffer!=2) throw(err); if(!delayederror) delayederror=err; return UNDEFINED; } };