From: glyn Date: Thu, 5 Jun 2014 11:35:50 +0000 (+0100) Subject: Initial commit X-Git-Url: https://git.8kb.co.uk/?p=slony-i%2Fpgbouncer_follower;a=commitdiff_plain;h=b16268179c6f926bc61e9498262467ef28bdc25c Initial commit --- b16268179c6f926bc61e9498262467ef28bdc25c diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ff37810 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +.DS_Store +Thumb.db diff --git a/LICENCE b/LICENCE new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/LICENCE @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..e98d8e9 --- /dev/null +++ b/README.md @@ -0,0 +1,44 @@ +#PgBouncer Slony-I replication set follower + +This script is a command-line utility to monitor the nodes in a Slony-I cluster +and reconfigure pgbouncer to follow an origin or subscriber of replication sets. + +The idea is pretty simple; periodically poll the slony schema to identify origin +and subscriber nodes and repoint an existing pgbouncer instance to follow either +the origin for read-write or a subscriber for read-only operation. The script +takes a template pgbouncer.ini file containing all the desired settings except +for the target database and will write a copy with the target database and reload +pgbouncer. In 'ro' mode the script will try and choose a subscriber node closest +to pgbouncer host if IPv4 addressing has been used for the slony conninfos. + +##Example usage + +The script can be either run on a schedule or as a daemon with the "D" flag: + +# pgbouncer_follower.pl -f [-D] + +##Configuration options + +| Section | Parameter | Type | Default | Comment +|:----------|:-----------------------|:--------|:--------------------------------------------|:----------------------------------- +| Slony | slony_user | text | *'slony'* | Username used to connect to PostgreSQL and select from slony schema tables +| Slony | slony_pass | text | *''* | Recommended to leave blank and use .pgpass file +| Slony | slony_cluster_name | text | *'replication'* | Name of slony cluster (without leading underscore of schema name) +| Slony | server_conninfo | text | *null* | Conninfo string for slony a node, can be specified multiple times +| pgBouncer | debug | boolean | *false* | Churn out debugging info to log file / stdout +| pgBouncer | follower_poll_interval | integer | *1000* | Interval to poll slony cluster state when in daemon mode +| pgBouncer | sets_to_follow | text | *1* | Comma separated list of sets to follow or 'all' to follow all sets +| pgBouncer | pool_mode | 'ro/rw' | *'rw'* | Select a read-only subscriber or the origin for read-write +| pgBouncer | pool_all_databases | boolean | *'false'* | If true uses wildcard for database name in pgbouncer.ini, false uses slony database +| pgBouncer | status_file | text | *'/tmp/pgbouncer_follower_%mode.status'* | File used to store a hash depicting the state of the cluster +| pgBouncer | log_file | text | *'/tmp/pgbouncer_follower_%mode.log'* | Log file for the script +| pgBouncer | pid_file | text | *'/tmp/pgbouncer_follower_%mode.log'* | PID file for the script when run as a daemon +| pgBouncer | pool_conf_template | text | *'/etc/pgbouncer/pgbouncer_%mode.template'* | Template pgbouncer.ini file with your settings and a blank [databases] section +| pgBouncer | pool_conf_target | text | *'/etc/pgbouncer/pgbouncer_%mode.ini'* | Target pgbouncer.ini file to write a copy of pool_conf_template with a [databases] section to +| pgBouncer | pool_reload_command | text | *'/etc/init.d/pgbouncer_%mode reload"'* | System command to execute to reload pgbouncer instance + +The status_file, log_file, pid_file, pool_conf_template, pool_conf_target and +pool_reload_command parameters can contain the following special values: + + %mode - Pool Mode + %clname - Slony cluster name diff --git a/init.debian b/init.debian new file mode 100644 index 0000000..267bdf4 --- /dev/null +++ b/init.debian @@ -0,0 +1,54 @@ +#!/bin/bash + +### BEGIN INIT INFO +# Provides: pgbouncer_follower_rw +# Required-Start: $network $local_fs $remote_fs $syslog +# Required-Stop: $network $local_fs $remote_fs $syslog +# Default-Start: 2 3 4 5 +# Default-Stop: 0 1 6 +# Short-Description: Start pgbouncer_follower_rw daemon at boot time +# Description: Enable pgbouncer_follower_rw service. +### END INIT INFO + +NAME=pgbouncer_follower_rw +USER=root +DAEMON=/var/slony/pgbouncer_follower/pgbouncer_follower.pl +CFGFILE=/var/slony/pgbouncer_follower/$NAME.conf +DAEMON_OPTS="-f $CFGFILE -D" +PIDFILE=/var/run/$NAME.pid +# note: SSD is required only at startup of the daemon. +SSD=`which start-stop-daemon` +ENV="env -i LANG=C PATH=/bin:/usr/bin:/usr/local/bin:/usr/local/pgsql/bin" + +trap "" 1 + +case "$1" in + start) + echo -n "Starting server: $NAME" + su $USER -c "$ENV $SSD --start --pidfile $PIDFILE --background --quiet --exec $DAEMON -- $DAEMON_OPTS" + ;; + + stop) + echo -n "Stopping server: $NAME" + su $USER -c "$SSD --stop --pidfile $PIDFILE" + ;; + + restart) + $0 stop + $0 start + ;; + + *) + echo "Usage: /etc/init.d/$NAME {start|stop|restart}" + exit 1 + ;; +esac + +if [ $? -eq 0 ]; then + echo . + exit 0 +else + echo " failed" + exit 1 +fi + diff --git a/pgbouncer_follower.pl b/pgbouncer_follower.pl new file mode 100755 index 0000000..b5152df --- /dev/null +++ b/pgbouncer_follower.pl @@ -0,0 +1,617 @@ +#!/usr/bin/perl + +# Script: pgbouncer_follower.pl +# Copyright: 22/04/2012: v1.0.1 Glyn Astill +# Requires: Perl 5.10.1+, PostgreSQL 9.0+ Slony-I 2.0+ +# +# This script is a command-line utility to monitor Slony-I clusters +# and reconfigure pgbouncer to follow replication sets. +# +# This script is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. +# +# This script is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this script. If not, see . + +use strict; +use warnings; +use DBI; +use v5.10.1; +use Getopt::Long qw/GetOptions/; +use Digest::MD5 qw/md5 md5_hex md5_base64/; +use Sys::Hostname; +use IO::Socket; +use Time::HiRes qw/usleep/; +use sigtrap 'handler' => \&cleanExit, 'HUP', 'INT','ABRT','QUIT','TERM'; +Getopt::Long::Configure qw/no_ignore_case/; + +use vars qw{%opt}; + +use constant false => 0; +use constant true => 1; + +my $g_usage = 'Pass configuration file: pool_follower.pl -f [-D] '; +my $g_debug = false; +my $g_pidfile = "/tmp/pgbouncer_follower_%mode.pid"; +my $g_logfile = "/tmp/pgbouncer_follower_%mode.log"; +my $g_poll_interval = 1000; +my $g_user = "slony"; +my $g_pass; +my $g_clname = "replication"; +my $g_clsets = "1"; +my @g_conninfos; +my @g_cluster; # no_id, no_comment, no_prov, orig_sets, conninfo, dbname, host, port +my $g_status_file = "/tmp/pgbouncer_follower_%mode.status"; +my $g_conf_template = "/etc/pgbouncer/pgbouncer_%mode.template"; +my $g_conf_target = "/etc/pgbouncer/pgbouncer_%mode.ini"; +my $g_reload_command = "/etc/init.d/pgbouncer_%mode reload"; +my $g_mode = 'rw'; +my $g_all_databases=false; +my ($year, $month, $day, $hour, $min, $sec); +my $change_time; +my $g_host = hostname; +my ($g_addr)=inet_ntoa((gethostbyname(hostname))[4]); + +die $g_usage unless GetOptions(\%opt, 'config_file|f=s', 'daemon|D',) and keys %opt and ! @ARGV; + +unless (getConfig($opt{config_file})){ + print ("There was a problem reading the configuration.\n"); +} +if (!defined($g_status_file)) { + $g_status_file = "/tmp/$g_clname.status"; +} + + +if ($g_debug) { + printLogLn($g_logfile, "DEBUG: Logging to my '$g_logfile'"); + printLogLn($g_logfile, "\t Watching sets $g_clsets in Slony-I cluster '$g_clname' polling every ${g_poll_interval}ms"); + printLogLn($g_logfile, "\t Following " . ($g_all_databases ? "all databases" : "replicated database only") . " on an '$g_mode' node for the above replicated sets"); + printLogLn($g_logfile, "\t Template config '$g_conf_template' Target config '$g_conf_target'"); + printLogLn($g_logfile, "\t Reload command is '$g_reload_command'"); + printLogLn($g_logfile, "\t Status stored in '$g_status_file'"); + printLogLn($g_logfile, "\t Using local address for '$g_host' as '$g_addr'"); + #printLogLn($g_logfile, "\t '$g_user' as '$g_pass'"); +} + +if (defined($opt{daemon})) { + printLogLn($g_logfile, "pgbouncer_follower starting up"); + if (writePID($g_pidfile)) { + while (true) { + doAll(); + if ($g_debug) { + printLogLn($g_logfile, "DEBUG: Sleeping for ${g_poll_interval}ms"); + } + usleep($g_poll_interval * 1000); + } + } +} +else { + doAll(); +} + +cleanExit(0); + +sub cleanExit { + if (defined($opt{daemon})) { + printLogLn($g_logfile, "pgbouncer_follower shutting down"); + removePID($g_pidfile); + } + exit(0); +} + +sub doAll { + my $node_to; + + foreach my $conninfo (@g_conninfos) { + eval { + @g_cluster = loadCluster($g_clname, $conninfo, $g_user, $g_pass, $g_addr, $g_clsets); + if ($g_debug) { + printLogLn($g_logfile, "DEBUG: Cluster with " . scalar(@g_cluster) . " nodes read from conninfo: $conninfo"); + foreach (@g_cluster) { + printLogLn($g_logfile, "DEBUG: Node #" . @$_[0] . " DETAIL: " . @$_[1] . " " . @$_[2] . " " . (@$_[3] // "") . " " . @$_[4] . " " . (@$_[5] // "") . " " . @$_[6] . " " . @$_[7] . " " . @$_[8] . " " . @$_[9] . " " ); + } + } + }; + if ($@) { + printLogLn($g_logfile, "ERROR: Failed using conninfo: $conninfo DETAIL: $@"); + } + else { + last; + } + } + unless (checkCluster($g_status_file)) { + if ($g_debug) { + printLogLn ($g_logfile, "DEBUG: Cluster status unchanged"); + } + } + else { + printLogLn ($g_logfile, "Cluster status changed"); + $node_to = generateConfig($g_conf_template, $g_conf_target, $g_mode, $g_all_databases, $g_clsets); + if (reloadConfig($g_reload_command)) { + printLogLn ($g_logfile, "Pool repointed to node #$node_to"); + } + } +} + +sub reloadConfig { + my $reload_command = shift; + my $success = true; + if(length($reload_command // '')) { + printLogLn($g_logfile, "Running '$reload_command'"); + eval { + open(RELOAD, "-|", $reload_command . " 2>&1"); + while () { + printLogLn($g_logfile, $_); + } + close(RELOAD); + printLogLn($g_logfile, "Reload command has been run."); + }; + if ($@) { + printLogLn($g_logfile, "ERROR: Failed to run reload command DETAIL: $@"); + $success = false; + } + } + return $success; +} + +sub generateConfig { + my $template = shift; + my $target = shift; + my $mode = shift; + my $all_databases = shift; + my $clsets = shift; + + my $success = false; + my @sets_to_follow; + my @sets_origin; + my @sets_subscribed; + my $target_node_id; + my $target_db; + my $target_host; + my $target_sets; + my $target_port = 5432; + my $target_is_origin; + + if ($g_debug) { + printLogLn($g_logfile, "DEBUG: All databases = " . ($g_all_databases ? 'true' : 'false')); + } + + if (open(INFILE, "<", $template)) { + if (open(OUTFILE, ">", $target)) { + print OUTFILE "# Configuration file autogenerated at " . getRuntime() . " from $template\n"; + foreach () { + if (m/\[databases]/) { + + # Try and choose a node; we always assign the origin initially regardless of rw/ro status + # when in ro mode and if we then find a suitable subscriber we'll reassign to it. + foreach my $node (@g_cluster) { + if ($clsets ne 'all') { + @sets_to_follow = split(',', $clsets); + if (defined($node->[3])) { + @sets_origin = split(',', $node->[3]); + } + else { + undef @sets_origin; + } + if (defined($node->[6])) { + @sets_subscribed = split(',', $node->[6]); + } + else { + undef @sets_subscribed; + } + } + + if (($clsets eq 'all' && defined($node->[3])) || (@sets_to_follow && @sets_origin && checkProvidesAllSets(\@sets_to_follow, \@sets_origin))) { + if (defined($node->[8])) { + $target_db = $node->[7]; + $target_host = $node->[8]; + $target_node_id = $node->[0]; + $target_sets = $node->[3]; + $target_is_origin = true; + } + if (defined($node->[9])) { + $target_port = $node->[9]; + } + if ($mode eq "rw") { + last; + } + } + elsif (($mode eq "ro") && (($clsets eq 'all') || (@sets_to_follow && @sets_subscribed && checkProvidesAllSets(\@sets_to_follow, \@sets_subscribed)))) { + if (defined($node->[8])) { + $target_db = $node->[7]; + $target_host = $node->[8]; + $target_node_id = $node->[0]; + $target_sets = ($node->[6] // $node->[3]); + $target_is_origin = false; + } + if (defined($node->[9])) { + $target_port = $node->[9]; + } + last; + } + } + if (defined($target_host)) { + $_ = "# Configuration for " . ($target_is_origin ? "origin" : "subscriber") . " of sets $target_sets node #$target_node_id $target_host:$target_port\n" . $_; + printLogLn ($g_logfile, "DEBUG: Configuration for " . ($target_is_origin ? "origin" : "subscriber") . " of sets $target_sets node #$target_node_id $target_host:$target_port"); + if ($all_databases) { + $_ =~ s/(\[databases\])/$1\n\* = host=$target_host port=$target_port/; + } + else { + $_ =~ s/(\[databases\])/$1\n$target_db = host=$target_host port=$target_port dbname=$target_db/; + } + } + else { + $_ = "# Could not find any node providing sets $g_clsets in mode $mode\n"; + printLogLn ($g_logfile, "DEBUG: Could not find any node providing sets $g_clsets in mode $mode"); + } + + } + print OUTFILE $_; + } + close (OUTFILE); + } + else { + print ("ERROR: Can't open file $target\n"); + } + close(INFILE); + } + else { + print ("ERROR: Can't open file $template\n"); + } + return $target_node_id; +} + +sub checkCluster { + my $infile = shift; + my $changed = false; + my $current_cluster; + my $previous_cluster; + foreach (@g_cluster) { + $current_cluster = md5_hex(($current_cluster // "") . $_->[0] . $_->[2] . (defined($_->[3]) ? 't' : 'f')); + if ($g_debug) { + printLogLn($g_logfile, "DEBUG: Node " . $_->[0] . " detail = " . $_->[2] . (defined($_->[3]) ? 't' : 'f')); + } + } + + if (-f $infile) { + if (open(CLUSTERFILE, "<", $infile)) { + $previous_cluster = ; + close(CLUSTERFILE); + } + else { + printLogLn ($g_logfile, "ERROR: Can't open file $infile for reading"); + } + } + + if (open(CLUSTERFILE, ">", $infile)) { + print CLUSTERFILE $current_cluster; + close(CLUSTERFILE); + } + else { + printLogLn ($g_logfile, "ERROR: Can't open file $infile for writing"); + } + + if ((($previous_cluster // "")ne "") && (($current_cluster // "") ne "") && ($current_cluster ne $previous_cluster)){ + $changed = true; + } + + return $changed +} + +sub loadCluster { + my $clname = shift; + my $conninfo = shift; + my $dbuser = shift; + my $dbpass = shift; + my $addr = shift; + my $clsets = shift; + my $param_on = 1; + + my $dsn; + my $dbh; + my $sth; + my $query; + my $version; + my $qw_clname; + my @cluster; + + $dsn = "DBI:Pg:$conninfo};"; + + eval { + $dbh = DBI->connect($dsn, $dbuser, $dbpass, {RaiseError => 1}); + $qw_clname = $dbh->quote_identifier("_" . $clname); + + $query = "SELECT $qw_clname.getModuleVersion()"; + $sth = $dbh->prepare($query); + $sth->execute(); + ($version) = $sth->fetchrow; + $sth->finish; + + $query = "WITH x AS ( + SELECT a.no_id, + a.no_comment, + COALESCE(b.sub_provider, 0) AS no_prov, + NULLIF(array_to_string(array(SELECT set_id FROM $qw_clname.sl_set WHERE set_origin = a.no_id" . + ($clsets ne "all" ? " AND set_id IN (" . substr('?, ' x scalar(split(',', $clsets)), 0, -2) . ")" : "") + . " ORDER BY set_id), ','), '') AS origin_sets, + CASE " . ((substr($version,0,3) >= 2.2) ? "WHEN a.no_failed THEN 'FAILED' " : "") . "WHEN a.no_active THEN 'ACTIVE' ELSE 'INACTIVE' END AS no_status, + string_agg(CASE WHEN b.sub_receiver = a.no_id AND b.sub_forward AND b.sub_active" . + ($clsets ne "all" ? " AND b.sub_set IN (" . substr('?, ' x scalar(split(',', $clsets)), 0, -2) . ")" : "") + . " THEN b.sub_set::text END, ',' ORDER BY b.sub_set) AS prov_sets, + COALESCE(c.pa_conninfo,(SELECT pa_conninfo FROM $qw_clname.sl_path WHERE pa_server = $qw_clname.getlocalnodeid(?) LIMIT 1)) AS no_conninfo + FROM $qw_clname.sl_node a + LEFT JOIN $qw_clname.sl_subscribe b ON a.no_id = b.sub_receiver AND b.sub_set <> 999 + LEFT JOIN $qw_clname.sl_path c ON c.pa_server = a.no_id AND c.pa_client = $qw_clname.getlocalnodeid(?) + LEFT JOIN $qw_clname.sl_set d ON d.set_origin = a.no_id + GROUP BY b.sub_provider, a.no_id, a.no_comment, c.pa_conninfo, a.no_active + ORDER BY (COALESCE(b.sub_provider, 0) = 0) DESC, a.no_id ASC + ), z AS ( + SELECT *, + CASE WHEN x.no_conninfo ilike '%dbname=%' THEN(regexp_matches(x.no_conninfo, E'dbname=(.+?)\\\\M', 'ig'))[1] END AS database, + CASE WHEN x.no_conninfo ilike '%host=%' THEN(regexp_matches(x.no_conninfo, E'host=(.+?)(?=\\\\s|\$)', 'ig'))[1] END AS host, + CASE WHEN x.no_conninfo ilike '%port=%' THEN(regexp_matches(x.no_conninfo, E'port=(.+?)\\\\M', 'ig'))[1] ELSE '5432' END AS port + FROM x + ) + SELECT * FROM z + ORDER BY origin_sets, @(CASE WHEN (host ~ '^[0-9]{1,3}(.[0-9]{1,3}){3}\$') THEN host::inet ELSE '255.255.255.255'::inet END - ?::inet) ASC"; + + if ($g_debug) { + printLogLn($g_logfile, "DEBUG: " . $query); + } + + $sth = $dbh->prepare($query); + + if ($clsets ne "all") { + for (0..1) { + foreach my $param (split(",", $clsets)) { + $sth->bind_param($param_on, $param); + $param_on++; + } + } + } + $sth->bind_param($param_on, "_" . $clname); + $param_on++; + $sth->bind_param($param_on, "_" . $clname); + $param_on++; + $sth->bind_param($param_on, (isInet($addr) ? $addr : '255.255.255.255')); + $sth->execute(); + + while (my @node = $sth->fetchrow) { + push(@cluster, \@node); + } + + $sth->finish; + $dbh->disconnect(); + }; + if ($@) { + printLogLn($g_logfile, "ERROR: Failed to execute query against Postgres server: $@"); + } + + return @cluster; +} + +sub getConfig { + my @fields; + my $success = false; + my $infile = shift; + my $value; + + if (open(CFGFILE, "<", $infile)) { + foreach () { + chomp $_; + for ($_) { + s/\r//; + #s/\#.*//; + s/#(?=(?:(?:[^']|[^"]*+'){2})*+[^']|[^"]*+\z).*//; + } + if (length(trim($_))) { + @fields = split('=', $_, 2); + $value = qtrim(trim($fields[1])); + given(lc($fields[0])) { + when(/\bdebug\b/i) { + $g_debug = checkBoolean($value); + } + when(/\bpid_file\b/i) { + $g_pidfile = $value; + } + when(/\blog_file\b/i) { + $g_logfile = $value; + } + when(/\bslony_user\b/i) { + $g_user = $value; + } + when(/\bslony_pass\b/i) { + $g_pass = $value; + } + when(/\bslony_cluster_name\b/i) { + $g_clname = $value; + } + when(/\bslony_sets_to_follow\b/i) { + $g_clsets = $value; + } + when(/\bserver_conninfo\b/i) { + push(@g_conninfos, $value); + } + when(/\bfollower_poll_interval\b/i) { + $g_poll_interval = checkInteger($value); + } + when(/\bstatus_file\b/i) { + $g_status_file = $value; + } + when(/\bpool_conf_template\b/i) { + $g_conf_template = $value; + } + when(/\bpool_conf_target\b/i) { + $g_conf_target = $value; + } + when(/\bpool_reload_command\b/i) { + $g_reload_command = $value; + } + when(/\bpool_mode\b/i) { + $g_mode = lc($value); + } + when(/\bpool_all_databases\b/i) { + $g_all_databases = checkBoolean($value); + } + } + } + } + close (CFGFILE); + if (defined($g_user) && (scalar(@g_conninfos) > 0)) { + $success = true; + } + # Replace %mode and %clname here for actual value + for ($g_pidfile, $g_logfile, $g_status_file, $g_conf_template, $g_conf_target, $g_reload_command) { + s/\%mode/$g_mode/g; + s/\%clname/$g_clname/g; + } + + + } + else { + printLogLn($g_logfile, "ERROR: Could not read configuration from '$infile'"); + } + return $success; +} + +sub writePID { + my $pidfile = shift; + my $success = true; + + eval { + open (PIDFILE, ">", $pidfile); + print PIDFILE $$; + close (PIDFILE); + if ($g_debug) { + printLogLn($g_logfile, "DEBUG: Created PID file '$pidfile' for process $$"); + } + }; + if ($@) { + printLogLn($g_logfile, "ERROR: unable to write pidfile at '$pidfile' DETAIL $!"); + $success = false; + } + return $success; +} + +sub removePID { + my $pidfile = shift; + my $success = true; + + eval { + if (-f $pidfile) { + unlink $pidfile; + if ($g_debug) { + printLogLn($g_logfile, "DEBUG: Removed PID file '$pidfile'"); + } + } + elsif ($g_debug){ + printLogLn($g_logfile, "DEBUG: PID file '$pidfile' never existed to be removed"); + } + }; + if ($@) { + printLogLn($g_logfile, "ERROR: unable to remove pidfile at '$pidfile' DETAIL $!"); + $success = false; + } + return $success +} + +sub checkBoolean { + my $text = shift; + my $value = undef; + if ( grep /^$text$/i, ("y","yes","t","true","on") ) { + $value = true; + } + elsif ( grep /^$text$/i, ("n","no","f","false","off") ) { + $value = false; + } + return $value; +} + +sub checkInteger { + my $integer = shift; + my $value = undef; + + if (($integer * 1) eq $integer) { + $value = int($integer); + } + return $value; +} + +sub checkProvidesAllSets { + my ($originSets, $providerSets) = @_; + my %test_hash; + + undef @test_hash{@$originSets}; # add a hash key for each element of @$originSets + delete @test_hash{@$providerSets}; # remove all keys for elements of @$providerSets + + return !%test_hash; # return false if any keys are left in the hash +} + +sub isInet { + my $address = shift; + my $success = true; + + my(@octets) = $address =~ /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/; + if (@octets == 4) { + foreach (@octets) { + unless ($_ <= 255) { + $success = false; + } + } + } + else { + $success = false; + } + + return $success; +} + +sub qtrim { + my $string = shift; + $string =~ s/^('|")+//; + $string =~ s/('|")+$//; + return $string; +} + +sub trim { + my $string = shift; + $string =~ s/^\s+//; + $string =~ s/\s+$//; + return $string; +} + +sub getRuntime { + my ($year, $month, $day, $hour, $min, $sec) = (localtime(time))[5,4,3,2,1,0]; + my $time = sprintf ("%02d:%02d:%02d on %02d/%02d/%04d", $hour, $min, $sec, $day, $month+1, $year+1900); + return $time; +} + +sub printLog { + my $logfile = shift; + my $message = shift; + + print $message; + + if (open(LOGFILE, ">>", $logfile)) { + print LOGFILE getRuntime() . " " . $message; + close (LOGFILE); + } + else { + printLn("ERROR: Unable to write to logfile $logfile"); + } +} + +sub printLogLn { + printLog ($_[0], $_[1] . $/); +} + +sub printLn { + print ((@_ ? join($/, @_) : $_), $/); +} diff --git a/pgbouncer_follower_rw.conf b/pgbouncer_follower_rw.conf new file mode 100755 index 0000000..f0f0d8f --- /dev/null +++ b/pgbouncer_follower_rw.conf @@ -0,0 +1,41 @@ +#------------------------------------------------------------------------------ +# Slony cluster information +#------------------------------------------------------------------------------ +slony_user=slony # Username to use when connecting to PostgreSQL server to + # retrieve slony cluster configuration + +slony_pass= # Password for above, leave blank to use .pgpass + +slony_cluster_name=test_replication # Slony-I replication cluster name + +server_conninfo=dbname=TEST host=localhost port=5432 # Conninfo of server to to retrieve slony cluster configuration +server_conninfo=dbname=TEST host=localhost port=5433 # from, accepts multiple servers and will try in order given. +server_conninfo=dbname=TEST host=localhost port=5434 +server_conninfo=dbname=TEST host=localhost port=5435 + +#------------------------------------------------------------------------------ +# PgBouncer follower information +#------------------------------------------------------------------------------ +debug = true +follower_poll_interval=5000 # Cluster state poll interval (milliseconds) + +slony_sets_to_follow=all # Comma separated list of set id's to follow E.g. "1,2,3,4" or "all" + +pool_mode=rw # Values are rw/ro. "rw" follows the origin node + # whereas "ro" will follow a subscriber of the sets + # specified in slony_sets_to_follow + +pool_all_databases=false # If true uses a wildcard in the conninfo for the pooler + # thus hosting all databases on the node. If false + # only the replicated database is hosted. + +status_file=/var/slony/pgbouncer_follower/pgbouncer_follower_%mode.status # File used to store tate of the cluster +log_file=/var/slony/pgbouncer_follower/pgbouncer_follower_%mode.log # Log for pool_follower script +pid_file=/var/run/pgbouncer_follower_%mode.pid # Pidfile for poll mode +pool_conf_template=/etc/pgbouncer/pgbouncer_%mode.template # Template configuration file +pool_conf_target=/etc/pgbouncer/pgbouncer_%mode.ini # Target configuration file to be modified +pool_reload_command=invoke-rc.d pgbouncer_%mode reload # Command used to action configuration changes + # Sepcial values for status_file, log_file, pool_conf_template + # pool_conf_target and pool_reload_command parameters: + # %mode - Pool Mode + # %clname - Slony cluster name