--- /dev/null
+# -*- perl -*-
+# ApplySnapshot
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use lib "@LIBDIR@";
+use IO::File;
+use RServ;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+ print "Usage: $0 --host=name --user=name --password=string slavedb\n";
+ exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $slave = $ARGV[0] || "slave";
+
+my $sinfo = "dbname=$slave";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb(sinfo);
+
+my $inpf = new IO::File;
+$inpf = STDIN;
+
+$res = ApplySnapshot ($conn, $inpf);
+
+if ($res > 0)
+{
+ printf STDERR "Snapshot applied\n";
+}
+elsif ($res != 0)
+{
+ printf STDERR "ERROR\n";
+ exit(1);
+}
+
+exit(0);
--- /dev/null
+# -*- perl -*-
+# CleanLog
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use lib "@LIBDIR@";
+
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 2) || ($ARGV[1] !~ /^\d+$/)) {
+ print "Usage: $PROGRAM_NAME --host=name --user=name --password=string masterdb syncid\n";
+ exit ((scalar(@ARGV) < 2)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+my $howold = $ARGV[1];
+
+my $minfo = "dbname=$dbname";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+print "Master connection is $minfo\n" if ($debug);
+print "Slave connection is $sinfo\n" if ($debug);
+
+my $conn = Pg::connectdb($minfo);
+
+$res = CleanLog($conn, $howold);
+
+exit(1) if $res < 0;
+
+printf STDERR "Deleted %d log records\n", $res if $res > 0;
+
+exit(0);
--- /dev/null
+# -*- perl -*-
+# GetSyncID
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use lib "@LIBDIR@";
+
+use Pg;
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+my $verbose = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose if (defined($opt_verbose));
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+ print "Usage: $0 --host=name --user=name --password=string slavedb\n";
+ exit ((scalar(@ARGV) < 1)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+
+my $sinfo = "dbname=$dbname";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+if ($verbose) { print "Connecting to '$sinfo'\n" };
+my $conn = Pg::connectdb($sinfo);
+
+$res = GetSyncID($conn);
+
+die "ERROR\n" if $res < 0;
+
+if (! defined $res)
+{
+ printf STDERR "No SyncID found\n";
+}
+else
+{
+ print("Last SyncID applied: ") if ($verbose);
+ printf "%d", $res;
+ print("\n") if ($verbose);
+}
+
+exit(0);
--- /dev/null
+#!/bin/sh
+# InitRservTest
+# erServer demonstration implementation
+# (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+
+[ -n "$RSERV_PERL" ] || RSERV_PERL=@LIBDIR@
+[ -n "$RSERV_SQL" ] || RSERV_SQL=@SQLDIR@
+[ -n "$RSERV_BIN" ] || RSERV_BIN=@BINDIR@
+export RSERV_PERL
+export RSERV_SQL
+export RSERV_BIN
+
+pargs=
+
+while [[ $1 == -* ]]; do
+ case "$1" in
+ --user)
+ shift
+ pargs="$pargs -U $1"
+ ;;
+ --host)
+ shift
+ pargs="$pargs -h $1"
+ ;;
+ *)
+ echo "Usage: $0 --user name --host name masterdb slavedb"
+ exit 1
+ ;;
+ esac
+ shift
+done
+
+masterdb=$1
+slavedb=$2
+
+[ "${masterdb}" != "" ] || masterdb=master
+[ "${slavedb}" != "" ] || slavedb=slave
+
+echo "Master -> $masterdb"
+echo "Slave -> $slavedb"
+
+############################################################################
+
+fill()
+{
+ table="create table test (i text, k int, l int);
+copy test from stdin;
+Line: 1 1 1
+Line: 2 2 2
+Line: 3 3 3
+Line: 4 4 4
+Line: 5 5 5
+Line: 6 6 6
+Line: 7 7 7
+Line: 8 8 8
+Line: 9 9 9
+Line: 10 10 10
+Line: 11 11 11
+Line: 12 12 12
+Line: 13 13 13
+Line: 14 14 14
+Line: 15 15 15
+Line: 16 16 16
+Line: 17 17 17
+Line: 18 18 18
+Line: 19 19 19
+Line: 20 20 20
+Line: 21 21 21
+Line: 22 22 22
+Line: 23 23 23
+Line: 24 24 24
+Line: 25 25 25
+Line: 26 26 26
+Line: 27 27 27
+Line: 28 28 28
+Line: 29 29 29
+Line: 30 30 30
+Line: 31 31 31
+Line: 32 32 32
+Line: 33 33 33
+Line: 34 34 34
+Line: 35 35 35
+Line: 36 36 36
+Line: 37 37 37
+Line: 38 38 38
+Line: 39 39 39
+Line: 40 40 40
+Line: 41 41 41
+Line: 42 42 42
+Line: 43 43 43
+Line: 44 44 44
+Line: 45 45 45
+Line: 46 46 46
+Line: 47 47 47
+Line: 48 48 48
+Line: 49 49 49
+Line: 50 50 50
+Line: 51 51 51
+Line: 52 52 52
+Line: 53 53 53
+Line: 54 54 54
+Line: 55 55 55
+Line: 56 56 56
+Line: 57 57 57
+Line: 58 58 58
+Line: 59 59 59
+Line: 60 60 60
+Line: 61 61 61
+Line: 62 62 62
+Line: 63 63 63
+Line: 64 64 64
+Line: 65 65 65
+Line: 66 66 66
+Line: 67 67 67
+Line: 68 68 68
+Line: 69 69 69
+Line: 70 70 70
+Line: 71 71 71
+Line: 72 72 72
+Line: 73 73 73
+Line: 74 74 74
+Line: 75 75 75
+Line: 76 76 76
+Line: 77 77 77
+Line: 78 78 78
+Line: 79 79 79
+Line: 80 80 80
+Line: 81 81 81
+Line: 82 82 82
+Line: 83 83 83
+Line: 84 84 84
+Line: 85 85 85
+Line: 86 86 86
+Line: 87 87 87
+Line: 88 88 88
+Line: 89 89 89
+Line: 90 90 90
+Line: 91 91 91
+Line: 92 92 92
+Line: 93 93 93
+Line: 94 94 94
+Line: 95 95 95
+Line: 96 96 96
+Line: 97 97 97
+Line: 98 98 98
+Line: 99 99 99
+Line: 100 100 100
+\\.";
+ echo "$table" | psql $pargs $1 || exit
+ if [ "$1" = "$masterdb" ]
+ then
+ rm -rf __tmpf__
+ psql $pargs -c "select * into table testoid from test" $1 || exit
+ psql $pargs -c "copy testoid with oids to '`pwd`/__tmpf__'" $1 || exit
+ psql $pargs -c "select * into table teststr from test" $1 || exit
+ else
+ psql $pargs -c "select * into table testoid from test where k < 0" $1 || exit
+ psql $pargs -c "copy testoid with oids from '`pwd`/__tmpf__'" $1 || exit
+ psql $pargs -c "select * into table teststr from test" $1 || exit
+ rm -rf __tmpf__
+ fi
+ psql $pargs -c "create unique index i_test on test (k)" $1 || exit
+ psql $pargs -c "create unique index i_testoid on testoid (oid)" $1 || exit
+ psql $pargs -c "create unique index i_teststr on teststr (i)" $1 || exit
+ psql $pargs -c vacuum $1 || exit
+}
+
+############################################################################
+
+echo
+echo
+echo ' ATTENTION'
+echo
+echo This script will destroy databases with names MASTER and SLAVE
+echo
+echo -n "Are you going to continue ? [Y/N] "
+
+read answ
+
+case $answ in
+ Y*|y*)
+ ;;
+ *)
+ exit
+ ;;
+esac
+
+echo
+echo
+
+sql="drop database $masterdb"
+echo $sql
+psql $pargs -c "$sql" template1
+sql="create database $masterdb"
+echo $sql
+psql $pargs -c "$sql" template1 || exit
+
+echo Setup master system
+psql $pargs $masterdb < $RSERV_SQL/master.sql || exit
+
+echo Wait for template1 to become available...
+sleep 1
+
+sql="drop database $slavedb"
+echo $sql
+psql $pargs -c "$sql" template1
+sql="create database $slavedb"
+echo $sql
+psql $pargs -c "$sql" template1 || exit
+
+echo Setup slave system
+psql $pargs $slavedb < $RSERV_SQL/slave.sql || exit
+
+echo Create and fill test, testoid and teststr tables in master db
+fill $masterdb
+echo
+echo Register test, testoid and teststr tables for replication on master
+echo
+$RSERV_BIN/MasterAddTable $masterdb test k
+$RSERV_BIN/MasterAddTable $masterdb testoid oid
+$RSERV_BIN/MasterAddTable $masterdb teststr i
+
+echo Create and fill test, testoid and teststr tables in slave db
+fill $slavedb
+echo
+echo Register test, testoid and teststr tables for replication on slave
+echo
+$RSERV_BIN/SlaveAddTable $slavedb test k
+$RSERV_BIN/SlaveAddTable $slavedb testoid oid
+$RSERV_BIN/SlaveAddTable $slavedb teststr i
+
+echo
+echo
+echo
+echo
+echo
+echo
+echo
+echo
+echo " Now make changes in $masterdb db and run"
+echo
+echo " Replicate $masterdb $slavedb"
+echo
+echo " to replicate the master on the slave."
+echo
+echo " You may also use the RservTest tcl utility"
+echo " to demonstrate this functionality."
+echo
+echo
+echo
+echo
+echo
+echo
+echo
+echo
+
+exit
+
+############################################################################
--- /dev/null
+# Makefile for erServer demonstration implementation
+# (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+
+#vpath %.pl perl
+#vpath %.pm perl
+
+subdir = contrib/rserv
+top_builddir = ../..
+include $(top_builddir)/src/Makefile.global
+
+NAME = rserv
+OBJS = $(NAME).o
+DOCS = README.$(NAME)
+SQLS = master.sql slave.sql
+TCLS = RservTest
+PERLS = MasterInit SlaveInit MasterAddTable SlaveAddTable Replicate CleanLog
+PERLS += PrepareSnapshot ApplySnapshot GetSyncID SyncSyncID
+LIBS = RServ.pm
+SCRIPTS = InitRservTest
+MODS = $(OBJS:.o=$(DLSUFFIX))
+
+override CPPFLAGS += -I$(srcdir)
+override CFLAGS += $(CFLAGS_SL)
+
+INPUTFILES = $(wildcard *.in)
+CLEANFILES = $(INPUTFILES:.in=)
+CLEANFILES += $(OBJS) $(MODS)
+
+.PHONY: all install installdirs tarball
+
+all: $(SQLS) $(TCLS) $(PERLS) $(SCRIPTS) $(MODS)
+
+install: all installdirs
+ $(INSTALL_DATA) $(SQLS) $(libdir)/contrib
+ $(INSTALL_SCRIPT) $(TCLS) $(PERLS) $(SCRIPTS) $(bindir)
+ $(INSTALL_SCRIPT) $(LIBS) $(libdir)/contrib
+ $(INSTALL_SHLIB) $(MODS) $(libdir)/contrib
+ $(INSTALL_DATA) $(DOCS) $(docdir)/contrib/$(NAME)
+
+installdirs:
+ $(mkinstalldirs) $(datadir)/contrib $(libdir)/contrib $(docdir)/contrib/$(NAME)
+
+%.sql: %.sql.in
+ rm -f $@; \
+ C=`pwd`; \
+ sed -e "s:_OBJWD_:$(libdir)/contrib:g" \
+ -e "s:_DLSUFFIX_:$(DLSUFFIX):g" < $< > $@
+
+%: %.in
+ sed -e "s:_OBJWD_:$(libdir)/contrib:g" \
+ -e "s:_DLSUFFIX_:$(DLSUFFIX):g" \
+ -e "s:@SQLDIR@:$(libdir)/contrib:g" \
+ -e "s:@BINDIR@:$(bindir):g" \
+ -e "s:@LIBDIR@:$(libdir)/contrib:g" < $< > $@
+ chmod 775 $@
+
+clean:
+# @echo "Removing $(CLEANFILES)"
+ rm -f $(CLEANFILES)
--- /dev/null
+# -*- perl -*-
+# MasterAddTable
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 3)) {
+ print "Usage: $0 --host=name --user=name --password=string masterdb table column\n";
+ exit ((scalar(@ARGV) < 3)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+my $table = $ARGV[1];
+my $keyname = $ARGV[2];
+
+my $minfo = "dbname=$dbname";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb($minfo);
+
+my $result = $conn->exec("BEGIN");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("select pgc.oid, pga.attnum from pg_class pgc" .
+ ", pg_attribute pga where pgc.relname = '$table'" .
+ " and pgc.oid = pga.attrelid" .
+ " and pga.attname = '$keyname'");
+die $conn->errorMessage if $result->resultStatus ne PGRES_TUPLES_OK;
+
+my @row = $result->fetchrow;
+die "Can't find table/key\n" if ! defined $row[0] || ! defined $row[1];
+
+$result = $conn->exec("create trigger _RSERV_TRIGGER_T_ after" .
+ " insert or update or delete on $table" .
+ " for each row execute procedure" .
+ " _rserv_log_('$row[1]')");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("insert into _RSERV_TABLES_ (tname, cname, reloid, key)" .
+ " values ('$table', '$keyname', $row[0], $row[1])");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("COMMIT");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+exit(0);
--- /dev/null
+# -*- perl -*-
+# MasterInit
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+ print "Usage: $0 --host=name --user=name --password=string masterdb\n";
+ exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+sub RollbackAndQuit {
+ $conn = shift @_;
+
+ print STDERR "Error in query: ", $conn->errorMessage;
+ $conn->exec("ROLLBACK");
+ exit (-1);
+}
+
+my $conn = Pg::connectdb($minfo);
+if ($conn->status != PGRES_CONNECTION_OK) {
+ print STDERR "Failed opening $minfo\n";
+ exit 1;
+}
+
+my $result = $conn->exec("BEGIN");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("set transaction isolation level serializable");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# List of slave servers
+$result = $conn->exec("create table _RSERV_SERVERS_" .
+ " (server serial, host text, post int4, dbase text)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# List of replicated tables
+$result = $conn->exec("create table _RSERV_TABLES_" .
+ " (tname name, cname name, reloid oid, key int4)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# Bookkeeping log for row replication
+$result = $conn->exec("create table _RSERV_LOG_" .
+ " (reloid oid, logid int4, logtime timestamp, deleted int4, key text)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# This is to speedup lookup of deleted tuples
+$result = $conn->exec("create index _RSERV_LOG_INDX_DLT_ID_ on _RSERV_LOG_ (deleted, logid)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# This is to speedup cleanup
+$result = $conn->exec("create index _RSERV_LOG_INDX_TM_ID_ on _RSERV_LOG_ (logtime, logid)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# This is to speedup trigger and lookup of updated tuples
+$result = $conn->exec("create index _RSERV_LOG_INDX_REL_KEY_ on _RSERV_LOG_ (reloid, key)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# Sync point for each slave server
+$result = $conn->exec("create table _RSERV_SYNC_" .
+ " (server int4, syncid int4, synctime timestamp" .
+ ", status int4, minid int4, maxid int4, active text)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("create index _RSERV_SYNC_INDX_SRV_ID_ on _RSERV_SYNC_ (server, syncid)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+# Sync point reference numbers
+$result = $conn->exec("create sequence _rserv_sync_seq_");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("CREATE FUNCTION _rserv_log_() RETURNS opaque" .
+ " AS '_OBJWD_/rserv_DLSUFFIX_' LANGUAGE 'c'");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("CREATE FUNCTION _rserv_sync_(int4) RETURNS int4" .
+ " AS '_OBJWD_/rserv_DLSUFFIX_' LANGUAGE 'c'");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("CREATE FUNCTION _rserv_debug_(int4) RETURNS int4" .
+ " AS '_OBJWD_/rserv_DLSUFFIX_' LANGUAGE 'c'");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("COMMIT");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+exit (0);
--- /dev/null
+# -*- perl -*-
+# PrepareSnapshot
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use lib "@LIBDIR@";
+
+use IO::File;
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+ print "Usage: $0 --snapshot=file --host=name --user=name --password=string masterdb\n";
+ exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+my $server = 0;
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb($minfo);
+
+my $outf = new IO::File;
+$outf = STDOUT;
+
+$res = PrepareSnapshot ($conn, $outf, $server);
+
+if ($res == 0)
+{
+ printf STDERR "Sync-ed\n";
+ exit(0);
+}
+if ($res > 0)
+{
+ printf STDERR "Snapshot dumped to STDOUT\n";
+ exit(0);
+}
+
+printf STDERR "ERROR\n";
+exit(1);
--- /dev/null
+erServer demonstration implementation
+(c) 2000, Vadim Mikheev and Thomas Lockhart, PostgreSQL Inc.
+
+Version 0.1:
+ Replicates a master database to a single slave database.
+ Tested under Linux (Mandrake 7.2).
+
+Requirements:
+
+- PostgreSQL >= 7.0.X
+ A separate Makefile is required for PostgreSQL 7.0.x and earlier
+- Perl5 and the PostgreSQL perl interface
+- TCL and the PostgreSQL tcl interface (for demo only)
+
+
+How to compile:
+
+- make all
+- make install
+
+Scripts and libraries are installed in places which are consistant
+with the way other contrib/ code is installed; underneath the core
+items in a contrib/ directory.
+
+
+The toolset:
+
+MasterInit dbname
+ sets up structures and user-defined functions for a master
+ database.
+
+SlaveInit dbname
+ sets up structures for a slave database. Does not include triggers,
+ but only bookkeeping tables.
+
+MasterAddTable dbname table column
+ sets up triggers for the specified table and column. Note that this
+ column must be updated for replication to occur.
+
+SlaveAddTable dbname table column
+ sets up bookkeeping for the specified table and column.
+
+Replicate masterdb slavedb
+ actually replicate changes from a master to single slave. Note that
+ this must be repeated to replicate to multiple slaves, but the
+ bookkeeping for each slave is handled separately so each can be
+ updated at different times and with different sets of changes.
+
+GetSyncID [--noverbose] slavedb
+ returns the last syncid the specified slave has seen. May be used
+ in conjunction with CleanLog using the --noverbose option.
+
+CleanLog masterdb syncid
+ removes obsolete entries in the master database replication log
+ table up to the specified replication sequence number.
+
+Other utilities:
+
+PrepareSnapshot
+ build a file of replication information from the specified masterdb.
+
+ApplySnapshot
+ use a file of replication information to apply to the specified
+ slavedb.
+
+
+How to run a demo:
+
+Run the InitRservTest script. It will create two local databases
+'master' & 'slave' with table 'test' in them. It accepts the following
+arguments:
+ --help
+ Print a usage message and quit.
+ --user name
+ Access the database with another username.
+ --host name
+ Access a remote database. Note that the shared library *must* be
+ visible in the same path as installed on the build machine.
+ masterdb
+ slavedb
+ Names of test databases. Defaults to 'master' and 'slave',
+ respectively.
+
+Once the test databases are set up, simply updating the master table
+is sufficient to log a replication event. You can update the table
+test then run "Replicate master slave", or you can use the demo
+program RservTest.
+
+Run the tcl/tk GUI demo program, RservTest. It has a single window,
+which has four buttons and three data entry boxes.
+
+ --------------------------------------------------
+ | PostgreSQL Asynchronous Replication |
+ | Master Slave |
+ | < master > < slave > |
+ | |
+ | [ Update ] < > |
+ | [ Replicate ] |
+ | [ Show ] ____________ |
+ | |
+ | [ Quit ] |
+ | |
+ --------------------------------------------------
+
+The demo has the following behaviors:
+
+If you enter a string into the data entry field to the right of
+[Update], then that string will be used to either update the master
+database or to query the slave database.
+
+If you click [Update], then the string in the data entry box will be
+entered into the master database.
+
+If you click [Replicate], then all changes since the last replication
+will be propagated to the slave database.
+
+If you click [Show], then the slave database will be queried to find
+the string in the data entry box to the right of the [Update]
+button. If the string does not (yet) exist in the slave database, then
+"n/a" will appear to the right of the [Show] button. If the string
+does exist in the slave database, then it will be printed to the right
+of the [Show] button.
+
+
+Todo:
+1. Support for multiple slave servers.
+2. Explicit support for master/slave failover.
+3. More docs.
--- /dev/null
+# -*- perl -*-
+# RServ.pm
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+package RServ;
+
+require Exporter;
+@ISA = qw(Exporter);
+@EXPORT = qw(PrepareSnapshot ApplySnapshot GetSyncID SyncSyncID CleanLog);
+@EXPORT_OK = qw();
+
+use Pg;
+
+$debug = 0;
+$quiet = 1;
+
+my %Mtables = ();
+my %Stables = ();
+
+sub PrepareSnapshot
+{
+ my ($conn, $outf, $server) = @_; # (@_[0], @_[1], @_[2]);
+
+ my $result = $conn->exec("BEGIN");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ $result = $conn->exec("set transaction isolation level serializable");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ # MAP oid --> tabname, keyname
+ $result = $conn->exec("select pgc.oid, pgc.relname, pga.attname" .
+ " from _RSERV_TABLES_ rt, pg_class pgc, pg_attribute pga" .
+ " where pgc.oid = rt.reloid and pga.attrelid = rt.reloid" .
+ " and pga.attnum = rt.key");
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ my @row;
+ while (@row = $result->fetchrow)
+ {
+ # printf "$row[0], $row[1], $row[2]\n";
+ push @{$Mtables{$row[0]}}, $row[1], $row[2];
+ }
+
+ # Read last succeeded sync
+ $sql = "select syncid, synctime, minid, maxid, active from _RSERV_SYNC_" .
+ " where server = $server and syncid = (select max(syncid) from" .
+ " _RSERV_SYNC_ where server = $server and status > 0)";
+
+ printf "$sql\n" if $debug;
+
+ $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ my @lastsync = $result->fetchrow;
+
+ my $sinfo = "";
+ if ($lastsync[3] ne '') # sync info
+ {
+ $sinfo = "and (l.logid >= $lastsync[3]";
+ $sinfo .= " or l.logid in ($lastsync[4])" if $lastsync[4] ne '';
+ $sinfo .= ")";
+ }
+
+ my $havedeal = 0;
+
+ # DELETED rows
+ $sql = "select l.reloid, l.key from _RSERV_LOG_ l" .
+ " where l.deleted = 1 $sinfo order by l.reloid";
+
+ printf "$sql\n" if $debug;
+
+ $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ $lastoid = '';
+ while (@row = $result->fetchrow)
+ {
+ next unless exists $Mtables{$row[0]};
+ if ($lastoid != $row[0])
+ {
+ if ($lastoid eq '')
+ {
+ my $syncid = GetSYNCID($conn, $outf);
+ return($syncid) if $syncid < 0;
+ $havedeal = 1;
+ }
+ else
+ {
+ printf $outf "\\.\n";
+ }
+ printf $outf "-- DELETE $Mtables{$row[0]}[0]\n";
+ $lastoid = $row[0];
+ }
+ if (! defined $row[1])
+ {
+ print STDERR "NULL key\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ printf $outf "%s\n", OutputValue($row[1]);
+ }
+ printf $outf "\\.\n" if $lastoid ne '';
+
+ # UPDATED rows
+
+ my ($taboid, $tabname, $tabkey);
+ foreach $taboid (keys %Mtables)
+ {
+ ($tabname, $tabkey) = @{$Mtables{$taboid}};
+ my $oidkey = ($tabkey eq 'oid') ? "_$tabname.oid," : '';
+ $sql = sprintf "select $oidkey _$tabname.* from _RSERV_LOG_ l," .
+ " $tabname _$tabname where l.reloid = $taboid and l.deleted = 0 $sinfo" .
+ " and l.key = _$tabname.${tabkey}::text";
+
+ printf "$sql\n" if $debug;
+
+ $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ printf $outf "-- ERROR\n" if $havedeal;
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ next if $result->ntuples <= 0;
+ if (! $havedeal)
+ {
+ my $syncid = GetSYNCID($conn, $outf);
+ return($syncid) if $syncid < 0;
+ $havedeal = 1;
+ }
+ printf $outf "-- UPDATE $tabname\n";
+ while (@row = $result->fetchrow)
+ {
+ for ($i = 0; $i <= $#row; $i++)
+ {
+ printf $outf " " if $i;
+ printf $outf "%s", OutputValue($row[$i]);
+ }
+ printf $outf "\n";
+ }
+ printf $outf "\\.\n";
+ }
+
+ unless ($havedeal)
+ {
+ $conn->exec("ROLLBACK");
+ return(0);
+ }
+
+ # Remember this snapshot info
+ $result = $conn->exec("select _rserv_sync_($server)");
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ printf $outf "-- ERROR\n";
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ $result = $conn->exec("COMMIT");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ printf $outf "-- ERROR\n";
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ printf $outf "-- OK\n";
+
+ return(1);
+
+}
+
+sub OutputValue
+{
+ my ($val) = @_; # @_[0];
+
+ return("\\N") unless defined $val;
+
+ $val =~ s/\\/\\\\/g;
+ $val =~ s/ /\\011/g;
+ $val =~ s/\n/\\012/g;
+ $val =~ s/\'/\\047/g;
+
+ return($val);
+}
+
+# Get syncid for new snapshot
+sub GetSYNCID
+{
+ my ($conn, $outf) = @_; # (@_[0], @_[1]);
+
+ my $result = $conn->exec("select nextval('_rserv_sync_seq_')");
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ my @row = $result->fetchrow;
+
+ printf $outf "-- SYNCID $row[0]\n";
+ return($row[0]);
+}
+
+
+sub CleanLog
+{
+ my ($conn, $howold) = @_; # (@_[0], @_[1]);
+
+ my $result = $conn->exec("BEGIN");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ my $sql = "select rs.maxid, rs.active from _RSERV_SYNC_ rs" .
+ " where rs.syncid = (select max(rs2.syncid) from _RSERV_SYNC_ rs2" .
+ " where rs2.server = rs.server and rs2.status > 0) order by rs.maxid";
+
+ printf "$sql\n" if $debug;
+
+ $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ return(-1);
+ }
+ my $maxid = '';
+ my %active = ();
+ while (my @row = $result->fetchrow)
+ {
+ $maxid = $row[0] if $maxid eq '';
+ last if $row[0] > $maxid;
+ my @ids = split(/[ ]+,[ ]+/, $row[1]);
+ foreach $aid (@ids)
+ {
+ $active{$aid} = 1 unless exists $active{$aid};
+ }
+ }
+ if ($maxid eq '')
+ {
+ print STDERR "No Sync IDs\n" unless ($quiet);
+ return(0);
+ }
+ my $alist = join(',', keys %active);
+ my $sinfo = "logid < $maxid";
+ $sinfo .= " and logid not in ($alist)" if $alist ne '';
+
+ $sql = "delete from _RSERV_LOG_ where " .
+ "logtime < now() - '$howold second'::interval and $sinfo";
+
+ printf "$sql\n" if $debug;
+
+ $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ $maxid = $result->cmdTuples;
+
+ $result = $conn->exec("COMMIT");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ return($maxid);
+}
+
+sub ApplySnapshot
+{
+ my ($conn, $inpf) = @_; # (@_[0], @_[1]);
+
+ my $result = $conn->exec("BEGIN");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ $result = $conn->exec("SET CONSTRAINTS ALL DEFERRED");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ # MAP name --> oid, keyname, keynum
+ my $sql = "select pgc.oid, pgc.relname, pga.attname, rt.key" .
+ " from _RSERV_SLAVE_TABLES_ rt, pg_class pgc, pg_attribute pga" .
+ " where pgc.oid = rt.reloid and pga.attrelid = rt.reloid" .
+ " and pga.attnum = rt.key";
+ $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ while (@row = $result->fetchrow)
+ {
+ # printf " %s %s\n", $row[1], $row[0];
+ push @{$Stables{$row[1]}}, $row[0], $row[2], $row[3];
+ }
+
+ my $ok = 0;
+ my $syncid = '';
+ while(<$inpf>)
+ {
+ $_ =~ s/\n//;
+ my ($cmt, $cmd, $prm) = split (/[ ]+/, $_, 3);
+ if ($cmt ne '--')
+ {
+ printf STDERR "Invalid format\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ if ($cmd eq 'DELETE')
+ {
+ if ($syncid eq '')
+ {
+ printf STDERR "Sync ID unspecified\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ $result = DoDelete($conn, $inpf, $prm);
+ if ($result)
+ {
+ $conn->exec("ROLLBACK");
+ return($result);
+ }
+ }
+ elsif ($cmd eq 'UPDATE')
+ {
+ if ($syncid eq '')
+ {
+ printf STDERR "Sync ID unspecified\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ $result = DoUpdate($conn, $inpf, $prm);
+ if ($result)
+ {
+ $conn->exec("ROLLBACK");
+ return($result);
+ }
+ }
+ elsif ($cmd eq 'SYNCID')
+ {
+ if ($syncid ne '')
+ {
+ printf STDERR "Second Sync ID ?!\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ if ($prm !~ /^\d+$/)
+ {
+ printf STDERR "Invalid Sync ID $prm\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ $syncid = $prm;
+
+ printf STDERR "Sync ID $syncid\n" unless ($quiet);
+
+ $result = $conn->exec("select syncid, synctime from " .
+ "_RSERV_SLAVE_SYNC_ where syncid = " .
+ "(select max(syncid) from _RSERV_SLAVE_SYNC_)");
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ my @row = $result->fetchrow;
+ if (! defined $row[0])
+ {
+ $result = $conn->exec("insert into" .
+ " _RSERV_SLAVE_SYNC_(syncid, synctime) values ($syncid, now())");
+ }
+ elsif ($row[0] >= $prm)
+ {
+ printf STDERR "Sync-ed to ID $row[0] ($row[1])\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(0);
+ }
+ else
+ {
+ $result = $conn->exec("update _RSERV_SLAVE_SYNC_" .
+ " set syncid = $syncid, synctime = now()");
+ }
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ }
+ elsif ($cmd eq 'OK')
+ {
+ $ok = 1;
+ last;
+ }
+ elsif ($cmd eq 'ERROR')
+ {
+ printf STDERR "ERROR signaled\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ else
+ {
+ printf STDERR "Unknown command $cmd\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+ }
+
+ if (! $ok)
+ {
+ printf STDERR "No OK flag in input\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-2);
+ }
+
+ $result = $conn->exec("COMMIT");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ return(1);
+}
+
+sub DoDelete
+{
+ my ($conn, $inpf, $tabname) = @_; # (@_[0], @_[1], @_[2]);
+
+ my $ok = 0;
+ while(<$inpf>)
+ {
+ if ($_ !~ /\n$/)
+ {
+ printf STDERR "Invalid format\n" unless ($quiet);
+ return(-2);
+ }
+ my $key = $_;
+ $key =~ s/\n//;
+ if ($key eq '\.')
+ {
+ $ok = 1;
+ last;
+ }
+
+ my $sql = "delete from $tabname where $Stables{$tabname}->[1] = '$key'";
+
+ printf "$sql\n" if $debug;
+
+ my $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ return(-1);
+ }
+ }
+
+ if (! $ok)
+ {
+ printf STDERR "No end of input in DELETE section\n" unless ($quiet);
+ return(-2);
+ }
+
+ return(0);
+}
+
+
+sub DoUpdate
+{
+ my ($conn, $inpf, $tabname) = @_; # (@_[0], @_[1], @_[2]);
+ my $oidkey = ($Stables{$tabname}->[2] < 0) ? 1 : 0;
+
+ my @CopyBuf = ();
+ my $CBufLen = 0;
+ my $CBufMax = 16 * 1024 * 1024; # max size of buf for copy
+
+ my $sql = "select attnum, attname from pg_attribute" .
+ " where attrelid = $Stables{$tabname}->[0] and attnum > 0";
+
+ my $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ return(-1);
+ }
+
+ my @anames = ();
+ while (@row = $result->fetchrow)
+ {
+ $anames[$row[0]] = $row[1];
+ }
+
+ my $istring;
+ my $ok = 0;
+ while(<$inpf>)
+ {
+ if ($_ !~ /\n$/)
+ {
+ printf STDERR "Invalid format\n" unless ($quiet);
+ return(-2);
+ }
+ $istring = $_;
+ $istring =~ s/\n//;
+ if ($istring eq '\.')
+ {
+ $ok = 1;
+ last;
+ }
+ my @vals = split(/ /, $istring);
+ if ($oidkey)
+ {
+ if ($vals[0] !~ /^\d+$/ || $vals[0] <= 0)
+ {
+ printf STDERR "Invalid OID\n" unless ($quiet);
+ return(-2);
+ }
+ $oidkey = $vals[0];
+ }
+ else
+ {
+ unshift @vals, '';
+ }
+
+ $sql = "update $tabname set ";
+ my $ocnt = 0;
+ for (my $i = 1; $i <= $#anames; $i++)
+ {
+ if ($vals[$i] eq '\N')
+ {
+ if ($i == $Stables{$tabname}->[2])
+ {
+ printf STDERR "NULL key\n" unless ($quiet);
+ return(-2);
+ }
+ $vals[$i] = 'null';
+ }
+ else
+ {
+ $vals[$i] = "'" . $vals[$i] . "'";
+ next if $i == $Stables{$tabname}->[2];
+ }
+ $ocnt++;
+ $sql .= ', ' if $ocnt > 1;
+ $sql .= "$anames[$i] = $vals[$i]";
+ }
+ if ($oidkey)
+ {
+ $sql .= " where $Stables{$tabname}->[1] = $oidkey";
+ }
+ else
+ {
+ $sql .= " where $Stables{$tabname}->[1] = $vals[$Stables{$tabname}->[2]]";
+ }
+
+ printf "$sql\n" if $debug;
+
+ $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ return(-1);
+ }
+ next if $result->cmdTuples == 1; # updated
+
+ if ($result->cmdTuples > 1)
+ {
+ printf STDERR "Duplicate keys\n" unless ($quiet);
+ return(-2);
+ }
+
+ # no key - copy
+ push @CopyBuf, "$istring\n";
+ $CBufLen += length($istring);
+
+ if ($CBufLen >= $CBufMax)
+ {
+ $result = DoCopy($conn, $tabname, $oidkey, \@CopyBuf);
+ return($result) if $result;
+ @CopyBuf = ();
+ $CBufLen = 0;
+ }
+ }
+
+ if (! $ok)
+ {
+ printf STDERR "No end of input in UPDATE section\n" unless ($quiet);
+ return(-2);
+ }
+
+ if ($CBufLen)
+ {
+ $result = DoCopy($conn, $tabname, $oidkey, \@CopyBuf);
+ return($result) if $result;
+ }
+
+ return(0);
+}
+
+
+sub DoCopy
+{
+ my ($conn, $tabname, $withoids, $CBuf) = @_; # (@_[0], @_[1], @_[2], @_[3]);
+
+ my $sql = "COPY $tabname " . (($withoids) ? "WITH OIDS " : '') .
+"FROM STDIN";
+ my $result = $conn->exec($sql);
+ if ($result->resultStatus ne PGRES_COPY_IN)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ return(-1);
+ }
+
+ foreach $str (@{$CBuf})
+ {
+ $conn->putline($str);
+ }
+
+ $conn->putline("\\.\n");
+
+ if ($conn->endcopy)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ return(-1);
+ }
+
+ return(0);
+
+}
+
+
+#
+# Returns last SyncID applied on Slave
+#
+sub GetSyncID
+{
+ my ($conn) = @_; # (@_[0]);
+
+ my $result = $conn->exec("select max(syncid) from _RSERV_SLAVE_SYNC_");
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ return(-1);
+ }
+ my @row = $result->fetchrow;
+ return(undef) unless defined $row[0]; # null
+ return($row[0]);
+}
+
+#
+# Updates _RSERV_SYNC_ on Master with Slave SyncID
+#
+sub SyncSyncID
+{
+ my ($conn, $server, $syncid) = @_; # (@_[0], @_[1], @_[2]);
+
+ my $result = $conn->exec("BEGIN");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ $result = $conn->exec("select synctime, status from _RSERV_SYNC_" .
+ " where server = $server and syncid = $syncid" .
+ " for update");
+ if ($result->resultStatus ne PGRES_TUPLES_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ my @row = $result->fetchrow;
+ if (! defined $row[0])
+ {
+ printf STDERR "No SyncID $syncid found for server $server\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(0);
+ }
+ if ($row[1] > 0)
+ {
+ printf STDERR "SyncID $syncid for server $server already updated\n" unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(0);
+ }
+ $result = $conn->exec("update _RSERV_SYNC_" .
+ " set synctime = now(), status = 1" .
+ " where server = $server and syncid = $syncid");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+ $result = $conn->exec("delete from _RSERV_SYNC_" .
+ " where server = $server and syncid < $syncid");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ $result = $conn->exec("COMMIT");
+ if ($result->resultStatus ne PGRES_COMMAND_OK)
+ {
+ print STDERR $conn->errorMessage unless ($quiet);
+ $conn->exec("ROLLBACK");
+ return(-1);
+ }
+
+ return(1);
+}
+
+1;
--- /dev/null
+# -*- perl -*-
+# Replicate
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use lib "@LIBDIR@";
+
+use IO::File;
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help", "snapshot=s",
+ "masterhost=s", "slavehost=s", "host=s",
+ "masteruser=s", "slaveuser=s", "user=s",
+ "masterpassword=s", "slavepassword=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $snapshot = $opt_snapshot || "__Snapshot";
+
+if (defined($opt_help) || (scalar(@ARGV) < 2)) {
+ print "Usage: $0 --snapshot=file --host=name --user=name --password=string masterdb slavedb\n";
+ print "\t--masterhost=name --masteruser=name --masterpassword=string\n";
+ print "\t--slavehost=name --slaveuser=name --slavepassword=string\n";
+ exit ((scalar(@ARGV) < 2)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+my $slave = $ARGV[1] || "slave";
+my $server = 0;
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_masterhost" if (defined($opt_masterhost));
+$minfo = "$minfo user=$opt_masteruser" if (defined($opt_masteruser));
+$minfo = "$minfo password=$opt_masterpassword" if (defined($opt_masterpassword));
+my $sinfo = "dbname=$slave";
+$sinfo = "$sinfo host=$opt_slavehost" if (defined($opt_slavehost));
+$sinfo = "$sinfo user=$opt_slaveuser" if (defined($opt_slaveuser));
+$sinfo = "$sinfo password=$opt_slavepassword" if (defined($opt_slavepassword));
+
+print "Master connection is $minfo\n" if ($debug);
+print "Slave connection is $sinfo\n" if ($debug);
+
+my $mconn = Pg::connectdb($minfo);
+my $sconn = Pg::connectdb($sinfo);
+
+SyncSync($mconn, $sconn);
+
+my $outf = new IO::File;
+open $outf, ">$snapshot";
+print "\n>>>>>>>>>>>>> Prepare Snapshot\n\n" if ($verbose);
+$res = PrepareSnapshot($mconn, $outf, $server);
+close $outf;
+die "\n>>>>>>>>>>>>> ERROR\n" if $res < 0;
+if ($res == 0)
+{
+ print "\n>>>>>>>>>>>>> DBases are sync-ed\n" if ($verbose);
+ exit(0);
+}
+
+my $inpf = new IO::File;
+open $inpf, "<$snapshot";
+print "\n>>>>>>>>>>>>> Apply Snapshot\n\n" if ($verbose);
+$res = ApplySnapshot($sconn, $inpf);
+close $inpf;
+die "\n>>>>>>>>>>>>> ERROR\n" if $res < 0;
+
+if ($res > 0)
+{
+ print "Snapshot applied\n" if ($verbose);
+ unlink $snapshot unless ($debug);
+ SyncSync($mconn, $sconn);
+}
+
+exit(0);
+
+###########################################################################
+
+sub SyncSync
+{
+ ($mconn, $sconn) = @_;
+
+ print "\n>>>>>>>>>>>>> Sync SyncID\n\n" if ($verbose);
+ print "Get last SyncID from Slave DB\n" if ($verbose);
+ $syncid = GetSyncID($sconn);
+ if ($syncid > 0)
+ {
+ print "Last SyncID applied: $syncid\n" if ($verbose);
+ print "Sync SyncID\n" if ($verbose);
+
+ $res = SyncSyncID($mconn, $server, $syncid);
+
+ print "Succeeded\n" if (($res > 0) && ($verbose));
+ }
+}
--- /dev/null
+#!/bin/sh
+# pgserv.tcl
+# (c) 2000 Thomas Lockhart, PostgreSQL Inc.
+# The next line will reinvoke as wish *DO NOT REMOVE OR ALTER* \
+exec wish "$0" "$@"
+
+puts "Starting Replication Server demo"
+
+set RSERV_BIN "@BINDIR@"
+
+# Bring in the interfaces we will be using...
+
+#package require Pgtcl
+load libpgtcl[info sharedlibextension]
+
+# elog
+# Information or error log and exit handler
+proc {elog} {level message} {
+ global show
+ switch -exact -- $level {
+ DEBUG {
+ if {$show(debug)} {
+ puts "DEBUG $message"
+ }
+ }
+ ERROR {
+ if {$show(error)} {
+ puts "ERROR $message"
+ }
+ FATAL {
+ if ($show(error)} {
+ puts "FATAL $message"
+ }
+ exit 1
+ }
+ default {
+ puts "INFO $message"
+ }
+ }
+}
+
+proc {ShowUsage} {} {
+ global argv0
+ puts "Usage: $argv0 --host name --user name --password string masterdb slavedb"
+ puts "\t--masterhost name --masteruser name --masterpassword string"
+ puts "\t--slavehost name --slaveuser name --slavepassword string"
+}
+
+# Initial values for database access
+# master, slave variables are tied to text input boxes,
+# and will be updated on user input
+proc {SetDbInfo} {db name {host ""} {user ""} {pass ""}} {
+ global dbinfo
+ set dbinfo($db,name) $name
+ set dbinfo($db,host) $host
+ set dbinfo($db,user) $user
+ set dbinfo($db,pass) $pass
+}
+
+# ConnInfo
+# Connection information for pgtcl library
+proc {ConnInfo} {{db master}} {
+ global dbinfo
+ set ci "dbname=$dbinfo($db,name)"
+ if {[string length $dbinfo($db,host)] > 0} {
+ set ci "$ci host=$dbinfo($db,host)"
+ }
+ if {[string length $dbinfo($db,user)] > 0} {
+ set ci "$ci user=$dbinfo($db,user)"
+ }
+ if {[string length $dbinfo($db,pass)] > 0} {
+ set ci "$ci password=$dbinfo($db,pass)"
+ }
+# puts "Construct conninfo $ci"
+ return $ci
+}
+
+# ConnInfoParams
+# Connection information for (perl) callable programs
+proc {ConnInfoParams} {{db master}} {
+ global dbinfo
+ set ci ""
+ if {[string length $dbinfo($db,host)] > 0} {
+ set ci "$ci --host=$dbinfo($db,host)"
+ }
+ if {[string length $dbinfo($db,user)] > 0} {
+ set ci "$ci --user=$dbinfo($db,user)"
+ }
+ if {[string length $dbinfo($db,pass)] > 0} {
+ set ci "$ci --password=$dbinfo($db,pass)"
+ }
+# puts "Construct conninfo $ci"
+ return $ci
+}
+
+# ConnInfoMaster
+# Connection information for (perl) callable programs
+proc {ConnInfoMaster} {{db master}} {
+ global dbinfo
+ set ci $dbinfo($db,name)
+ if {[string length $dbinfo($db,host)] > 0} {
+ set ci "$ci --masterhost=$dbinfo($db,host)"
+ }
+ if {[string length $dbinfo($db,user)] > 0} {
+ set ci "$ci --masteruser=$dbinfo($db,user)"
+ }
+ if {[string length $dbinfo($db,pass)] > 0} {
+ set ci "$ci --masterpassword=$dbinfo($db,pass)"
+ }
+# puts "Construct conninfo $ci"
+ return $ci
+}
+
+# ConnInfoSlave
+# Connection information for (perl) callable programs
+proc {ConnInfoSlave} {{db slave}} {
+ global dbinfo
+ set ci $dbinfo($db,name)
+ if {[string length $dbinfo($db,host)] > 0} {
+ set ci "$ci --slavehost=$dbinfo($db,host)"
+ }
+ if {[string length $dbinfo($db,user)] > 0} {
+ set ci "$ci --slaveuser=$dbinfo($db,user)"
+ }
+ if {[string length $dbinfo($db,pass)] > 0} {
+ set ci "$ci --slavepassword=$dbinfo($db,pass)"
+ }
+# puts "Construct conninfo $ci"
+ return $ci
+}
+
+
+SetDbInfo master master localhost
+SetDbInfo slave slave localhost
+set dbinfo(snapshot,name) "__Snapshot"
+
+set update ""
+
+set show(debug) 1
+set show(error) 1
+
+set argi 0
+while {$argi < $argc} {
+# puts "argi is $argi; argc is $argc"
+ set arg [lindex $argv $argi]
+ switch -glob -- $arg {
+ -h -
+ --host {
+ incr argi
+ set dbinfo(master,host) [lindex $argv $argi]
+ set dbinfo(slave,host) [lindex $argv $argi]
+ }
+ --masterhost {
+ incr argi
+ set dbinfo(master,host) [lindex $argv $argi]
+ }
+ --slavehost {
+ incr argi
+ set dbinfo(slave,host) [lindex $argv $argi]
+ }
+ -u -
+ --user {
+ incr argi
+ set dbinfo(master,user) [lindex $argv $argi]
+ set dbinfo(slave,user) [lindex $argv $argi]
+ }
+ --masteruser {
+ incr argi
+ set dbinfo(master,user) [lindex $argv $argi]
+ }
+ --slaveuser {
+ incr argi
+ set dbinfo(slave,user) [lindex $argv $argi]
+ }
+ -s -
+ --snapshot {
+ incr argi
+ set dbinfo(snapshot,name) [lindex $argv $argi]
+ }
+ -* {
+ elog ERROR "$argv0: invalid parameter '$arg'"
+ ShowUsage
+ exit 1
+ }
+ default {
+ break
+ }
+ }
+ incr argi
+}
+
+if {$argi < $argc} {
+ set dbinfo(master,name) [lindex $argv $argi]
+ incr argi
+}
+if {$argi < $argc} {
+ set dbinfo(slave,name) [lindex $argv $argi]
+ incr argi
+}
+if {$argi < $argc} {
+ elog "$argv0: too many parameters"
+ ShowUsage
+ exit 1
+}
+
+elog DEBUG "User is $dbinfo(master,user) $dbinfo(slave,user)"
+elog DEBUG "Host is $dbinfo(master,host) $dbinfo(slave,host)"
+
+#
+# TK layout
+#
+
+wm title . "Async Replication"
+
+wm geom . 400x400
+
+proc {CreateResultFrame} {b l w} {
+ pack [frame $b -borderwidth 10] -fill x
+ pack [button $b.run -text $l -command $l -width $w] -side left
+# pack [entry $b.e -textvariable NewRow] -side left
+}
+
+set t .top
+pack [frame $t -borderwidth 10] -fill x
+pack [frame $t.h -borderwidth 10] -fill x
+pack [label $t.h.h -text "PostgreSQL Async Replication Server"]
+
+set b .b
+pack [frame $b -borderwidth 10] -fill x
+pack [frame $b.l -borderwidth 10] -fill x
+pack [label $b.l.ml -text "Master"] -side left
+pack [label $b.l.sl -text "Slave"] -side right
+pack [entry $b.m -textvariable dbinfo(master,name) -width 25] -side left
+pack [entry $b.s -textvariable dbinfo(slave,name) -width 25] -side right
+
+set b .u
+pack [frame $b -borderwidth 10] -fill x
+pack [button $b.run -text update -command Update -width 10] -side left
+pack [entry $b.e -textvariable update -width 50] -side left
+
+set r [CreateResultFrame .r Replicate 10]
+
+set b .s
+pack [frame $b -borderwidth 10] -fill x
+pack [button $b.b -text Show -command Show -width 10] -side left
+pack [label $b.e -text ""] -side left
+
+set b .button
+pack [frame $b -borderwidth 10] -fill x
+
+pack [button $b.quit -text "Quit" -command Shutdown]
+
+#
+# Functions mapped to buttons
+#
+
+proc {Update} {} {
+ global dbinfo
+ global update
+
+ elog DEBUG "Opening database [ConnInfo master]..."
+ set res [catch {set db [pg_connect -conninfo "[ConnInfo master]"]} msg]
+ if {$res} {
+ elog ERROR "Database '$dbinfo(master,name)' is not available: $res ($msg)"
+ } else {
+ elog DEBUG "Insert $update into database $dbinfo(master,name)..."
+ set res [pg_exec $db "insert into test select '$update', max(k)+1, max(l)+1 from test"]
+ elog DEBUG [pg_result $res -status]
+ catch {pg_disconnect $db}
+ }
+}
+
+proc {Replicate} {} {
+ global dbinfo
+ global RSERV_BIN
+
+ elog DEBUG "Replicating [ConnInfoCmd master]..."
+ exec "$RSERV_BIN/Replicate" --snapshot=$dbinfo(snapshot,name) [ConnInfoParams] [ConnInfoMaster] [ConnInfoSlave]
+}
+
+proc {Show} {} {
+ global dbinfo
+ global update
+
+ elog DEBUG "Opening database [ConnInfo slave]..."
+ set res [catch {set db [pg_connect -conninfo "[ConnInfo slave]"]} msg]
+ if {$res} {
+ elog ERROR "DB $dbinfo(slave,name) not available: $res ($msg)"
+ } else {
+ elog DEBUG "Select $update from database $dbinfo(slave,name)..."
+ set res [pg_exec $db "select i from test where i='$update'"]
+ if {[pg_result $res -status] != "PGRES_TUPLES_OK"} {
+ .s.e config -text "n/a"
+ } else {
+ set ntups [pg_result $res -numTuples]
+ if {$ntups <= 0} {
+ .s.e config -text "n/a"
+ } else {
+ for {set i 0} {$i < $ntups} {incr i} {
+ set val [pg_result $res -getTuple $i]
+ .s.e config -text $val
+ }
+ }
+ pg_result $res -clear
+ }
+ catch {pg_disconnect $db}
+ }
+}
+
+proc {Shutdown} {} {
+ global dbinfo
+ exit
+}
--- /dev/null
+# -*- perl -*-
+# SlaveAddTable
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "help",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 3)) {
+ print "Usage: $0 --host=name --user=name --password=string slavedb table column\n";
+ exit ((scalar(@ARGV) < 3)? 1: 0);
+}
+
+my $dbname = $ARGV[0];
+my $table = $ARGV[1];
+my $keyname = $ARGV[2];
+
+my $sinfo = "dbname=$dbname";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+my $dbname = $ARGV[0];
+my $table = $ARGV[1];
+my $keyname = $ARGV[2];
+
+my $conn = Pg::connectdb($sinfo);
+
+my $result = $conn->exec("BEGIN");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("select pgc.oid, pga.attnum from pg_class pgc" .
+ ", pg_attribute pga" .
+ " where pgc.relname = '$table' and pgc.oid = pga.attrelid" .
+ " and pga.attname = '$keyname'");
+die $conn->errorMessage if $result->resultStatus ne PGRES_TUPLES_OK;
+
+my @row = $result->fetchrow;
+die "Can't find table/key\n" if ! defined $row[0] || ! defined $row[1];
+
+$result = $conn->exec("insert into _RSERV_SLAVE_TABLES_ (tname, cname, reloid, key)" .
+ " values ('$table', '$keyname', $row[0], $row[1])");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+$result = $conn->exec("COMMIT");
+die $conn->errorMessage if $result->resultStatus ne PGRES_COMMAND_OK;
+
+exit(0);
--- /dev/null
+# -*- perl -*-
+# SlaveInit
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use Pg;
+use Getopt::Long;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "quiet!", "help",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $quiet = $opt_quiet || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 1)) {
+ print "Usage: $0 --host=name --user=name --password=string slavedb\n";
+ exit ((scalar(@ARGV) < 1)? 1:0);
+}
+
+my $slave = $ARGV[0] || "slave";
+
+my $sinfo = "dbname=$slave";
+$sinfo = "$sinfo host=$opt_host" if (defined($opt_host));
+$sinfo = "$sinfo user=$opt_user" if (defined($opt_user));
+$sinfo = "$sinfo password=$opt_password" if (defined($opt_password));
+
+sub RollbackAndQuit {
+ my $conn = shift @_;
+
+ print STDERR $conn->errorMessage;
+ $conn->exec("ROLLBACK");
+ exit (-1);
+}
+
+print "Connecting to $sinfo\n";
+my $conn = Pg::connectdb($sinfo);
+if ($conn->status != PGRES_CONNECTION_OK) {
+ print STDERR "Failed opening $sinfo\n";
+ exit 1;
+}
+
+my $result = $conn->exec("BEGIN");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("set transaction isolation level serializable");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("create table _RSERV_SLAVE_TABLES_" .
+ " (tname name, cname name, reloid oid, key int4)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("create table _RSERV_SLAVE_SYNC_" .
+ " (syncid int4, synctime timestamp)");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+$result = $conn->exec("COMMIT");
+RollbackAndQuit($conn) if ($result->resultStatus ne PGRES_COMMAND_OK);
+
+exit (0);
--- /dev/null
+# -*- perl -*-
+# SyncSyncID
+# Vadim Mikheev, (c) 2000, PostgreSQL Inc.
+
+eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
+ & eval 'exec perl -S $0 $argv:q'
+ if 0;
+
+use lib "@LIBDIR@";
+
+use Getopt::Long;
+use RServ;
+
+$| = 1;
+
+$result = GetOptions("debug!", "verbose!", "quiet!", "help",
+ "host=s", "user=s", "password=s");
+
+my $debug = $opt_debug || 0;
+my $verbose = $opt_verbose || 0;
+my $quiet = $opt_quiet || 0;
+
+if (defined($opt_help) || (scalar(@ARGV) < 2) || ($ARGV[1] !~ /^\d+$/)) {
+ print "Usage: $0 --host=name --user=name --password=string masterdb syncid\n";
+ exit ((scalar(@ARGV) < 2)? 1:0);
+}
+
+my $master = $ARGV[0] || "master";
+my $server = 0;
+my $syncid = $ARGV[1] || die "SyncID not specified";
+
+my $minfo = "dbname=$master";
+$minfo = "$minfo host=$opt_host" if (defined($opt_host));
+$minfo = "$minfo user=$opt_user" if (defined($opt_user));
+$minfo = "$minfo password=$opt_password" if (defined($opt_password));
+
+my $conn = Pg::connectdb($minfo);
+
+$res = SyncSyncID($conn, $server, $syncid);
+
+if ($res == 0)
+{
+ printf STDERR "SyncID updated on $master\n" if ($verbose);
+ exit(0);
+}
+
+printf STDERR "ERROR\n" unless ($quiet);
+exit(1);
--- /dev/null
+-- erServer
+-- Master server setup for erServer demonstration implementation
+-- (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+--
+
+--
+-- Slave servers
+--
+drop table _RSERV_SERVERS_;
+
+create table _RSERV_SERVERS_
+(
+ server int4, -- slave server id
+ host text, -- server' host
+ port int4, -- server' port
+ dbase text -- db name
+);
+
+
+--
+-- Tables to sync
+--
+drop table _RSERV_TABLES_;
+
+create table _RSERV_TABLES_
+(
+ tname name, -- table name
+ cname name, -- column name
+ reloid oid, -- table oid
+ key int4 -- key attnum
+);
+
+
+--
+-- Log for inserts/updates/deletes to sync-ed tables
+--
+drop table _RSERV_LOG_;
+
+create table _RSERV_LOG_
+(
+ reloid oid,
+ logid int4, -- xid of last update xaction
+ logtime timestamp, -- last update xaction start time
+ deleted int4, -- deleted or inserted/updated
+ key text --
+);
+
+-- This is to speedup lookup deleted tuples
+create index _RSERV_LOG_INDX_DLT_ID_ on _RSERV_LOG_ (deleted, logid);
+
+-- This is to speedup cleanup
+create index _RSERV_LOG_INDX_TM_ID_ on _RSERV_LOG_ (logtime, logid);
+
+-- This is to speedup trigger and lookup updated tuples
+create index _RSERV_LOG_INDX_REL_KEY_ on _RSERV_LOG_ (reloid, key);
+
+
+--
+-- How much each slave servers are sync-ed
+--
+drop table _RSERV_SYNC_;
+
+create table _RSERV_SYNC_
+(
+ server int4,
+ syncid int4, -- from _rserv_sync_seq_
+ synctime timestamp, --
+ status int4, -- prepared (0) | applied
+ minid int4, -- min xid from serializable snapshot
+ maxid int4, -- max xid from serializable snapshot
+ active text -- list of active xactions
+);
+
+create index _RSERV_SYNC_INDX_SRV_ID_ on _RSERV_SYNC_ (server, syncid);
+
+drop sequence _rserv_sync_seq_;
+create sequence _rserv_sync_seq_;
+
+drop function _rserv_log_();
+
+CREATE FUNCTION _rserv_log_()
+ RETURNS opaque
+ AS '_OBJWD_/rserv_DLSUFFIX_'
+ LANGUAGE 'c'
+;
+
+drop function _rserv_sync_(int4);
+
+CREATE FUNCTION _rserv_sync_(int4)
+ RETURNS int4
+ AS '_OBJWD_/rserv_DLSUFFIX_'
+ LANGUAGE 'c'
+;
+
+drop function _rserv_debug_(int4);
+
+CREATE FUNCTION _rserv_debug_(int4)
+ RETURNS int4
+ AS '_OBJWD_/rserv_DLSUFFIX_'
+ LANGUAGE 'c'
+;
--- /dev/null
+# regress.sh
+# rserv regression test script
+# (c) 2000 Thomas Lockhart, PostgreSQL Inc.
+
+dropdb master
+dropdb slave
+
+createdb master
+createdb slave
+
+MasterInit master
+SlaveInit slave
+
+psql -c "create table t1 (i int, t text, d timestamp default text 'now');" master
+MasterAddTable master t1 d
+
+psql -c "create table t1 (i int, t text, d timestamp default text 'now');" slave
+SlaveAddTable slave t1 d
+
+psql -c "insert into t1 values (1, 'one');" master
+psql -c "insert into t1 values (2, 'two');" master
+
+Replicate master slave
+SyncSyncID master `GetSyncID --noverbose slave`
+
+psql -c "insert into t1 values (3, 'three');" master
+psql -c "insert into t1 values (4, 'four');" master
+
+Replicate master slave
+SyncSyncID master `GetSyncID --noverbose slave`
+
+exit
--- /dev/null
+/* rserv.c
+ * Support functions for erServer replication.
+ * (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+ */
+
+#include "executor/spi.h" /* this is what you need to work with SPI */
+#include "commands/trigger.h" /* -"- and triggers */
+#include "utils/tqual.h" /* -"- and SnapshotData */
+#include /* tolower () */
+
+#ifdef PG_FUNCTION_INFO_V1
+#define CurrentTriggerData ((TriggerData *) fcinfo->context)
+#endif
+
+#ifdef PG_FUNCTION_INFO_V1
+PG_FUNCTION_INFO_V1(_rserv_log_);
+PG_FUNCTION_INFO_V1(_rserv_sync_);
+PG_FUNCTION_INFO_V1(_rserv_debug_);
+Datum _rserv_log_(PG_FUNCTION_ARGS);
+Datum _rserv_sync_(PG_FUNCTION_ARGS);
+Datum _rserv_debug_(PG_FUNCTION_ARGS);
+#else
+HeapTuple _rserv_log_(void);
+int32 _rserv_sync_(int32);
+int32 _rserv_debug_(int32);
+#endif
+
+static int debug = 0;
+
+static char* OutputValue(char *key, char *buf, int size);
+
+#ifdef PG_FUNCTION_INFO_V1
+Datum
+_rserv_log_(PG_FUNCTION_ARGS)
+#else
+HeapTuple
+_rserv_log_()
+#endif
+{
+ Trigger *trigger; /* to get trigger name */
+ int nargs; /* # of args specified in CREATE TRIGGER */
+ char **args; /* argument: argnum */
+ Relation rel; /* triggered relation */
+ HeapTuple tuple; /* tuple to return */
+ HeapTuple newtuple = NULL;/* tuple to return */
+ TupleDesc tupdesc; /* tuple description */
+ int keynum;
+ char *key;
+ char *okey;
+ char *newkey = NULL;
+ int deleted;
+ char sql[8192];
+ char outbuf[8192];
+ char oidbuf[64];
+ int ret;
+
+ /* Called by trigger manager ? */
+ if (!CurrentTriggerData)
+ elog(ERROR, "_rserv_log_: triggers are not initialized");
+
+ /* Should be called for ROW trigger */
+ if (TRIGGER_FIRED_FOR_STATEMENT(CurrentTriggerData->tg_event))
+ elog(ERROR, "_rserv_log_: can't process STATEMENT events");
+
+ tuple = CurrentTriggerData->tg_trigtuple;
+
+ trigger = CurrentTriggerData->tg_trigger;
+ nargs = trigger->tgnargs;
+ args = trigger->tgargs;
+
+ if (nargs != 1) /* odd number of arguments! */
+ elog(ERROR, "_rserv_log_: need in *one* argument");
+
+ keynum = atoi(args[0]);
+
+ if (keynum < 0 && keynum != ObjectIdAttributeNumber)
+ elog(ERROR, "_rserv_log_: invalid keynum %d", keynum);
+
+ rel = CurrentTriggerData->tg_relation;
+ tupdesc = rel->rd_att;
+
+ deleted = (TRIGGER_FIRED_BY_DELETE(CurrentTriggerData->tg_event)) ?
+ 1 : 0;
+
+ if (TRIGGER_FIRED_BY_UPDATE(CurrentTriggerData->tg_event))
+ newtuple = CurrentTriggerData->tg_newtuple;
+
+ /*
+ * Setting CurrentTriggerData to NULL prevents direct calls to trigger
+ * functions in queries. Normally, trigger functions have to be called
+ * by trigger manager code only.
+ */
+ CurrentTriggerData = NULL;
+
+ /* Connect to SPI manager */
+ if ((ret = SPI_connect()) < 0)
+ elog(ERROR, "_rserv_log_: SPI_connect returned %d", ret);
+
+ if (keynum == ObjectIdAttributeNumber)
+ {
+ sprintf(oidbuf, "%u", tuple->t_data->t_oid);
+ key = oidbuf;
+ }
+ else
+ key = SPI_getvalue(tuple, tupdesc, keynum);
+
+ if (key == NULL)
+ elog(ERROR, "_rserv_log_: key must be not null");
+
+ if (newtuple && keynum != ObjectIdAttributeNumber)
+ {
+ newkey = SPI_getvalue(newtuple, tupdesc, keynum);
+ if (newkey == NULL)
+ elog(ERROR, "_rserv_log_: key must be not null");
+ if (strcmp(newkey, key) == 0)
+ newkey = NULL;
+ else
+ deleted = 1; /* old key was deleted */
+ }
+
+ if (strpbrk(key, "\\ \n'"))
+ okey = OutputValue(key, outbuf, sizeof(outbuf));
+ else
+ okey = key;
+
+ sprintf(sql, "update _RSERV_LOG_ set logid = %d, logtime = now(), "
+ "deleted = %d where reloid = %u and key = '%s'",
+ GetCurrentTransactionId(), deleted, rel->rd_id, okey);
+
+ if (debug)
+ elog(NOTICE, sql);
+
+ ret = SPI_exec(sql, 0);
+
+ if (ret < 0)
+ elog(ERROR, "_rserv_log_: SPI_exec(update) returned %d", ret);
+
+ /*
+ * If no tuple was UPDATEd then do INSERT...
+ */
+ if (SPI_processed > 1)
+ elog(ERROR, "_rserv_log_: duplicate tuples");
+ else if (SPI_processed == 0)
+ {
+ sprintf(sql, "insert into _RSERV_LOG_ "
+ "(reloid, logid, logtime, deleted, key) "
+ "values (%u, %d, now(), %d, '%s')",
+ rel->rd_id, GetCurrentTransactionId(),
+ deleted, okey);
+
+ if (debug)
+ elog(NOTICE, sql);
+
+ ret = SPI_exec(sql, 0);
+
+ if (ret < 0)
+ elog(ERROR, "_rserv_log_: SPI_exec(insert) returned %d", ret);
+ }
+
+ if (okey != key && okey != outbuf)
+ pfree(okey);
+
+ if (newkey)
+ {
+ if (strpbrk(newkey, "\\ \n'"))
+ okey = OutputValue(newkey, outbuf, sizeof(outbuf));
+ else
+ okey = newkey;
+
+ sprintf(sql, "insert into _RSERV_LOG_ "
+ "(reloid, logid, logtime, deleted, key) "
+ "values (%u, %d, now(), 0, '%s')",
+ rel->rd_id, GetCurrentTransactionId(), okey);
+
+ if (debug)
+ elog(NOTICE, sql);
+
+ ret = SPI_exec(sql, 0);
+
+ if (ret < 0)
+ elog(ERROR, "_rserv_log_: SPI_exec returned %d", ret);
+
+ if (okey != newkey && okey != outbuf)
+ pfree(okey);
+ }
+
+ SPI_finish();
+
+#ifdef PG_FUNCTION_INFO_V1
+ return (PointerGetDatum(tuple));
+#else
+ return (tuple);
+#endif
+}
+
+#ifdef PG_FUNCTION_INFO_V1
+Datum
+_rserv_sync_(PG_FUNCTION_ARGS)
+#else
+int32
+_rserv_sync_(int32 server)
+#endif
+{
+#ifdef PG_FUNCTION_INFO_V1
+ int32 server = PG_GETARG_INT32(0);
+#endif
+ char sql[8192];
+ char buf[8192];
+ char *active = buf;
+ uint32 xcnt;
+ int ret;
+
+ if (SerializableSnapshot == NULL)
+ elog(ERROR, "_rserv_sync_: SerializableSnapshot is NULL");
+
+ buf[0] = 0;
+ for (xcnt = 0; xcnt < SerializableSnapshot->xcnt; xcnt++)
+ {
+ sprintf(buf + strlen(buf), "%s%u", (xcnt) ? ", " : "",
+ SerializableSnapshot->xip[xcnt]);
+ }
+
+ if ((ret = SPI_connect()) < 0)
+ elog(ERROR, "_rserv_sync_: SPI_connect returned %d", ret);
+
+ sprintf(sql, "insert into _RSERV_SYNC_ "
+ "(server, syncid, synctime, status, minid, maxid, active) "
+ "values (%u, currval('_rserv_sync_seq_'), now(), 0, %d, %d, '%s')",
+ server, SerializableSnapshot->xmin, SerializableSnapshot->xmax, active);
+
+ ret = SPI_exec(sql, 0);
+
+ if (ret < 0)
+ elog(ERROR, "_rserv_sync_: SPI_exec returned %d", ret);
+
+ SPI_finish();
+
+ return (0);
+}
+
+#ifdef PG_FUNCTION_INFO_V1
+Datum
+_rserv_debug_(PG_FUNCTION_ARGS)
+#else
+int32
+_rserv_debug_(int32 newval)
+#endif
+{
+#ifdef PG_FUNCTION_INFO_V1
+ int32 newval = PG_GETARG_INT32(0);
+#endif
+ int32 oldval = debug;
+
+ debug = newval;
+
+ return (oldval);
+}
+
+#define ExtendBy 1024
+
+static char*
+OutputValue(char *key, char *buf, int size)
+{
+ int i = 0;
+ char *out = buf;
+ char *subst = NULL;
+ int slen = 0;
+
+ size--;
+ for ( ; ; )
+ {
+ switch (*key)
+ {
+ case '\\': subst ="\\\\";
+ slen = 2;
+ break;
+ case ' ': subst = "\\011";
+ slen = 4;
+ break;
+ case '\n': subst = "\\012";
+ slen = 4;
+ break;
+ case '\'': subst = "\\047";
+ slen = 4;
+ break;
+ case '\0': out[i] = 0;
+ return(out);
+ default: slen = 1;
+ break;
+ }
+
+ if (i + slen >= size)
+ {
+ if (out == buf)
+ {
+ out = (char*) palloc(size + ExtendBy);
+ strncpy(out, buf, i);
+ size += ExtendBy;
+ }
+ else
+ {
+ out = (char*) repalloc(out, size + ExtendBy);
+ size += ExtendBy;
+ }
+ }
+
+ if (slen == 1)
+ out[i++] = *key;
+ else
+ {
+ memcpy(out + i, subst, slen);
+ i += slen;
+ }
+ key++;
+ }
+
+ return(out);
+
+}
--- /dev/null
+-- erServer
+-- Slave server setup for erServer demonstration implementation
+-- (c) 2000 Vadim Mikheev, PostgreSQL Inc.
+--
+
+drop table _RSERV_SLAVE_TABLES_;
+
+create table _RSERV_SLAVE_TABLES_
+(
+ tname name, -- table name
+ cname name, -- column name
+ reloid oid, -- table oid
+ key int4 -- key attnum
+);
+
+drop table _RSERV_SLAVE_SYNC_;
+
+create table _RSERV_SLAVE_SYNC_
+(
+ syncid int4,
+ synctime timestamp
+);
projects / postgresql.git / commitdiff