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authorLuke Shumaker <LukeShu@sbcglobal.net>2014-01-28 09:50:25 -0500
committerLuke Shumaker <LukeShu@sbcglobal.net>2014-01-28 09:50:25 -0500
commit5744df39e15f85c6cc8a9faf8924d77e76d2b216 (patch)
treea8c8dd40a94d1fa0d5377566aa5548ae55a163da /includes/db/LoadBalancer.php
parent4bb2aeca1d198391ca856aa16c40b8559c68daec (diff)
parent224b22a051051f6c2e494c3a2fb4adb42898e2d1 (diff)
Merge branch 'archwiki'
Conflicts: extensions/FluxBBAuthPlugin.php extensions/SyntaxHighlight_GeSHi/README extensions/SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.class.php extensions/SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.i18n.php extensions/SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.php extensions/SyntaxHighlight_GeSHi/geshi/docs/CHANGES extensions/SyntaxHighlight_GeSHi/geshi/docs/THANKS extensions/SyntaxHighlight_GeSHi/geshi/docs/TODO extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractClass.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractClass_logo.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractMethod.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractPrivateClass.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractPrivateClass_logo.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/AbstractPrivateMethod.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Class.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Class_logo.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Constant.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Constructor.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Destructor.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Function.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Global.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/I.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Index.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Interface.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Interface_logo.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/L.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Lminus.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Lplus.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Method.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Page.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Page_logo.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateClass.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateClass_logo.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateMethod.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/PrivateVariable.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/StaticMethod.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/StaticVariable.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/T.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Tminus.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Tplus.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/Variable.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/blank.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/class_folder.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/file.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/folder.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/function_folder.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/next_button.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/next_button_disabled.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/package.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/package_folder.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/previous_button.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/previous_button_disabled.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/private_class_logo.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/tutorial.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/tutorial_folder.png extensions/SyntaxHighlight_GeSHi/geshi/docs/api/media/images/up_button.png extensions/SyntaxHighlight_GeSHi/geshi/docs/geshi-doc.html extensions/SyntaxHighlight_GeSHi/geshi/docs/geshi-doc.txt extensions/SyntaxHighlight_GeSHi/geshi/geshi.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/4cs.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/6502acme.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/6502kickass.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/6502tasm.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/68000devpac.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/abap.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/actionscript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/actionscript3.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/ada.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/algol68.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/apache.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/applescript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/apt_sources.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/asm.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/asp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/autoconf.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/autohotkey.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/autoit.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/avisynth.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/awk.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/bascomavr.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/bash.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/basic4gl.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/bf.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/bibtex.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/blitzbasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/bnf.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/boo.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/c.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/c_loadrunner.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/c_mac.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/caddcl.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cadlisp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cfdg.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cfm.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/chaiscript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cil.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/clojure.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cmake.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cobol.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/coffeescript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cpp-qt.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cpp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/csharp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/css.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/cuesheet.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/d.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/dcs.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/delphi.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/diff.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/div.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/dos.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/dot.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/e.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/ecmascript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/eiffel.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/email.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/epc.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/erlang.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/euphoria.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/f1.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/falcon.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/fo.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/fortran.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/freebasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/fsharp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/gambas.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/gdb.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/genero.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/genie.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/gettext.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/glsl.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/gml.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/gnuplot.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/go.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/groovy.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/gwbasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/haskell.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/hicest.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/hq9plus.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/html4strict.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/html5.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/icon.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/idl.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/ini.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/inno.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/intercal.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/io.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/j.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/java.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/java5.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/javascript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/jquery.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/kixtart.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/klonec.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/klonecpp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/latex.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lb.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lisp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/llvm.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/locobasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/logtalk.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lolcode.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lotusformulas.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lotusscript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lscript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lsl2.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/lua.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/m68k.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/magiksf.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/make.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/mapbasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/matlab.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/mirc.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/mmix.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/modula2.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/modula3.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/mpasm.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/mxml.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/mysql.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/newlisp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/nsis.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/oberon2.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/objc.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/objeck.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/ocaml-brief.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/ocaml.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/oobas.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/oracle11.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/oracle8.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/oxygene.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/oz.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pascal.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pcre.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/per.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/perl.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/perl6.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pf.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/php-brief.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/php.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pic16.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pike.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pixelbender.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pli.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/plsql.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/postgresql.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/povray.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/powerbuilder.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/powershell.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/proftpd.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/progress.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/prolog.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/properties.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/providex.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/purebasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/pycon.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/python.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/q.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/qbasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/rails.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/rebol.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/reg.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/robots.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/rpmspec.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/rsplus.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/ruby.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/sas.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/scala.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/scheme.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/scilab.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/sdlbasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/smalltalk.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/smarty.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/sql.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/systemverilog.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/tcl.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/teraterm.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/text.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/thinbasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/tsql.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/typoscript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/unicon.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/uscript.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/vala.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/vb.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/vbnet.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/verilog.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/vhdl.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/vim.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/visualfoxpro.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/visualprolog.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/whitespace.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/whois.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/winbatch.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/xbasic.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/xml.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/xorg_conf.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/xpp.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/yaml.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/z80.php extensions/SyntaxHighlight_GeSHi/geshi/geshi/zxbasic.php
Diffstat (limited to 'includes/db/LoadBalancer.php')
-rw-r--r--includes/db/LoadBalancer.php252
1 files changed, 156 insertions, 96 deletions
diff --git a/includes/db/LoadBalancer.php b/includes/db/LoadBalancer.php
index 0e455e0c..857109db 100644
--- a/includes/db/LoadBalancer.php
+++ b/includes/db/LoadBalancer.php
@@ -37,14 +37,15 @@ class LoadBalancer {
private $mLoadMonitorClass, $mLoadMonitor;
/**
- * @param $params Array with keys:
+ * @param array $params with keys:
* servers Required. Array of server info structures.
* masterWaitTimeout Replication lag wait timeout
* loadMonitor Name of a class used to fetch server lag and load.
+ * @throws MWException
*/
function __construct( $params ) {
if ( !isset( $params['servers'] ) ) {
- throw new MWException( __CLASS__.': missing servers parameter' );
+ throw new MWException( __CLASS__ . ': missing servers parameter' );
}
$this->mServers = $params['servers'];
@@ -77,7 +78,7 @@ class LoadBalancer {
}
}
- foreach( $params['servers'] as $i => $server ) {
+ foreach ( $params['servers'] as $i => $server ) {
$this->mLoads[$i] = $server['load'];
if ( isset( $server['groupLoads'] ) ) {
foreach ( $server['groupLoads'] as $group => $ratio ) {
@@ -116,34 +117,14 @@ class LoadBalancer {
* Given an array of non-normalised probabilities, this function will select
* an element and return the appropriate key
*
+ * @deprecated since 1.21, use ArrayUtils::pickRandom()
+ *
* @param $weights array
*
- * @return int
+ * @return bool|int|string
*/
function pickRandom( $weights ) {
- if ( !is_array( $weights ) || count( $weights ) == 0 ) {
- return false;
- }
-
- $sum = array_sum( $weights );
- if ( $sum == 0 ) {
- # No loads on any of them
- # In previous versions, this triggered an unweighted random selection,
- # but this feature has been removed as of April 2006 to allow for strict
- # separation of query groups.
- return false;
- }
- $max = mt_getrandmax();
- $rand = mt_rand( 0, $max ) / $max * $sum;
-
- $sum = 0;
- foreach ( $weights as $i => $w ) {
- $sum += $w;
- if ( $sum >= $rand ) {
- break;
- }
- }
- return $i;
+ return ArrayUtils::pickRandom( $weights );
}
/**
@@ -186,7 +167,7 @@ class LoadBalancer {
#wfDebugLog( 'connect', var_export( $loads, true ) );
# Return a random representative of the remainder
- return $this->pickRandom( $loads );
+ return ArrayUtils::pickRandom( $loads );
}
/**
@@ -197,17 +178,18 @@ class LoadBalancer {
* Side effect: opens connections to databases
* @param $group bool
* @param $wiki bool
+ * @throws MWException
* @return bool|int|string
*/
function getReaderIndex( $group = false, $wiki = false ) {
global $wgReadOnly, $wgDBClusterTimeout, $wgDBAvgStatusPoll, $wgDBtype;
# @todo FIXME: For now, only go through all this for mysql databases
- if ($wgDBtype != 'mysql') {
+ if ( $wgDBtype != 'mysql' ) {
return $this->getWriterIndex();
}
- if ( count( $this->mServers ) == 1 ) {
+ if ( count( $this->mServers ) == 1 ) {
# Skip the load balancing if there's only one server
return 0;
} elseif ( $group === false and $this->mReadIndex >= 0 ) {
@@ -228,7 +210,7 @@ class LoadBalancer {
$nonErrorLoads = $this->mGroupLoads[$group];
} else {
# No loads for this group, return false and the caller can use some other group
- wfDebug( __METHOD__.": no loads for group $group\n" );
+ wfDebug( __METHOD__ . ": no loads for group $group\n" );
wfProfileOut( __METHOD__ );
return false;
}
@@ -237,6 +219,7 @@ class LoadBalancer {
}
if ( !$nonErrorLoads ) {
+ wfProfileOut( __METHOD__ );
throw new MWException( "Empty server array given to LoadBalancer" );
}
@@ -253,15 +236,15 @@ class LoadBalancer {
$currentLoads = $nonErrorLoads;
while ( count( $currentLoads ) ) {
if ( $wgReadOnly || $this->mAllowLagged || $laggedSlaveMode ) {
- $i = $this->pickRandom( $currentLoads );
+ $i = ArrayUtils::pickRandom( $currentLoads );
} else {
$i = $this->getRandomNonLagged( $currentLoads, $wiki );
- if ( $i === false && count( $currentLoads ) != 0 ) {
+ if ( $i === false && count( $currentLoads ) != 0 ) {
# All slaves lagged. Switch to read-only mode
wfDebugLog( 'replication', "All slaves lagged. Switch to read-only mode\n" );
$wgReadOnly = 'The database has been automatically locked ' .
'while the slave database servers catch up to the master';
- $i = $this->pickRandom( $currentLoads );
+ $i = ArrayUtils::pickRandom( $currentLoads );
$laggedSlaveMode = true;
}
}
@@ -270,16 +253,16 @@ class LoadBalancer {
# pickRandom() returned false
# This is permanent and means the configuration or the load monitor
# wants us to return false.
- wfDebugLog( 'connect', __METHOD__.": pickRandom() returned false\n" );
+ wfDebugLog( 'connect', __METHOD__ . ": pickRandom() returned false\n" );
wfProfileOut( __METHOD__ );
return false;
}
- wfDebugLog( 'connect', __METHOD__.": Using reader #$i: {$this->mServers[$i]['host']}...\n" );
+ wfDebugLog( 'connect', __METHOD__ . ": Using reader #$i: {$this->mServers[$i]['host']}...\n" );
$conn = $this->openConnection( $i, $wiki );
if ( !$conn ) {
- wfDebugLog( 'connect', __METHOD__.": Failed connecting to $i/$wiki\n" );
+ wfDebugLog( 'connect', __METHOD__ . ": Failed connecting to $i/$wiki\n" );
unset( $nonErrorLoads[$i] );
unset( $currentLoads[$i] );
continue;
@@ -318,7 +301,7 @@ class LoadBalancer {
# Some servers must have been overloaded
if ( $overloadedServers == 0 ) {
- throw new MWException( __METHOD__.": unexpectedly found no overloaded servers" );
+ throw new MWException( __METHOD__ . ": unexpectedly found no overloaded servers" );
}
# Back off for a while
# Scale the sleep time by the number of connected threads, to produce a
@@ -341,7 +324,7 @@ class LoadBalancer {
$this->mServers[$i]['slave pos'] = $conn->getSlavePos();
}
}
- if ( $this->mReadIndex <=0 && $this->mLoads[$i]>0 && $i !== false ) {
+ if ( $this->mReadIndex <= 0 && $this->mLoads[$i] > 0 && $i !== false ) {
$this->mReadIndex = $i;
}
}
@@ -356,7 +339,7 @@ class LoadBalancer {
*/
function sleep( $t ) {
wfProfileIn( __METHOD__ );
- wfDebug( __METHOD__.": waiting $t us\n" );
+ wfDebug( __METHOD__ . ": waiting $t us\n" );
usleep( $t );
wfProfileOut( __METHOD__ );
return $t;
@@ -366,7 +349,7 @@ class LoadBalancer {
* Set the master wait position
* If a DB_SLAVE connection has been opened already, waits
* Otherwise sets a variable telling it to wait if such a connection is opened
- * @param $pos int
+ * @param $pos DBMasterPos
*/
public function waitFor( $pos ) {
wfProfileIn( __METHOD__ );
@@ -384,13 +367,13 @@ class LoadBalancer {
/**
* Set the master wait position and wait for ALL slaves to catch up to it
- * @param $pos int
+ * @param $pos DBMasterPos
*/
public function waitForAll( $pos ) {
wfProfileIn( __METHOD__ );
$this->mWaitForPos = $pos;
for ( $i = 1; $i < count( $this->mServers ); $i++ ) {
- $this->doWait( $i , true );
+ $this->doWait( $i, true );
}
wfProfileOut( __METHOD__ );
}
@@ -417,7 +400,7 @@ class LoadBalancer {
* @param $open bool
* @return bool
*/
- function doWait( $index, $open = false ) {
+ protected function doWait( $index, $open = false ) {
# Find a connection to wait on
$conn = $this->getAnyOpenConnection( $index );
if ( !$conn ) {
@@ -425,7 +408,7 @@ class LoadBalancer {
wfDebug( __METHOD__ . ": no connection open\n" );
return false;
} else {
- $conn = $this->openConnection( $index );
+ $conn = $this->openConnection( $index, '' );
if ( !$conn ) {
wfDebug( __METHOD__ . ": failed to open connection\n" );
return false;
@@ -433,15 +416,15 @@ class LoadBalancer {
}
}
- wfDebug( __METHOD__.": Waiting for slave #$index to catch up...\n" );
+ wfDebug( __METHOD__ . ": Waiting for slave #$index to catch up...\n" );
$result = $conn->masterPosWait( $this->mWaitForPos, $this->mWaitTimeout );
if ( $result == -1 || is_null( $result ) ) {
# Timed out waiting for slave, use master instead
- wfDebug( __METHOD__.": Timed out waiting for slave #$index pos {$this->mWaitForPos}\n" );
+ wfDebug( __METHOD__ . ": Timed out waiting for slave #$index pos {$this->mWaitForPos}\n" );
return false;
} else {
- wfDebug( __METHOD__.": Done\n" );
+ wfDebug( __METHOD__ . ": Done\n" );
return true;
}
}
@@ -451,17 +434,20 @@ class LoadBalancer {
* This is the main entry point for this class.
*
* @param $i Integer: server index
- * @param $groups Array: query groups
- * @param $wiki String: wiki ID
+ * @param array $groups query groups
+ * @param bool|string $wiki Wiki ID
*
+ * @throws MWException
* @return DatabaseBase
*/
public function &getConnection( $i, $groups = array(), $wiki = false ) {
wfProfileIn( __METHOD__ );
if ( $i == DB_LAST ) {
+ wfProfileOut( __METHOD__ );
throw new MWException( 'Attempt to call ' . __METHOD__ . ' with deprecated server index DB_LAST' );
} elseif ( $i === null || $i === false ) {
+ wfProfileOut( __METHOD__ );
throw new MWException( 'Attempt to call ' . __METHOD__ . ' with invalid server index' );
}
@@ -476,7 +462,7 @@ class LoadBalancer {
$groupIndex = $this->getReaderIndex( $groups, $wiki );
if ( $groupIndex !== false ) {
$serverName = $this->getServerName( $groupIndex );
- wfDebug( __METHOD__.": using server $serverName for group $groups\n" );
+ wfDebug( __METHOD__ . ": using server $serverName for group $groups\n" );
$i = $groupIndex;
}
} else {
@@ -484,7 +470,7 @@ class LoadBalancer {
$groupIndex = $this->getReaderIndex( $group, $wiki );
if ( $groupIndex !== false ) {
$serverName = $this->getServerName( $groupIndex );
- wfDebug( __METHOD__.": using server $serverName for group $group\n" );
+ wfDebug( __METHOD__ . ": using server $serverName for group $group\n" );
$i = $groupIndex;
break;
}
@@ -493,20 +479,21 @@ class LoadBalancer {
# Operation-based index
if ( $i == DB_SLAVE ) {
+ $this->mLastError = 'Unknown error'; // reset error string
$i = $this->getReaderIndex( false, $wiki );
# Couldn't find a working server in getReaderIndex()?
if ( $i === false ) {
$this->mLastError = 'No working slave server: ' . $this->mLastError;
- $this->reportConnectionError( $this->mErrorConnection );
wfProfileOut( __METHOD__ );
- return false;
+ return $this->reportConnectionError();
}
}
# Now we have an explicit index into the servers array
$conn = $this->openConnection( $i, $wiki );
if ( !$conn ) {
- $this->reportConnectionError( $this->mErrorConnection );
+ wfProfileOut( __METHOD__ );
+ return $this->reportConnectionError();
}
wfProfileOut( __METHOD__ );
@@ -519,10 +506,11 @@ class LoadBalancer {
* the same number of times as getConnection() to work.
*
* @param DatabaseBase $conn
+ * @throws MWException
*/
public function reuseConnection( $conn ) {
- $serverIndex = $conn->getLBInfo('serverIndex');
- $refCount = $conn->getLBInfo('foreignPoolRefCount');
+ $serverIndex = $conn->getLBInfo( 'serverIndex' );
+ $refCount = $conn->getLBInfo( 'foreignPoolRefCount' );
$dbName = $conn->getDBname();
$prefix = $conn->tablePrefix();
if ( strval( $prefix ) !== '' ) {
@@ -531,7 +519,7 @@ class LoadBalancer {
$wiki = $dbName;
}
if ( $serverIndex === null || $refCount === null ) {
- wfDebug( __METHOD__.": this connection was not opened as a foreign connection\n" );
+ wfDebug( __METHOD__ . ": this connection was not opened as a foreign connection\n" );
/**
* This can happen in code like:
* foreach ( $dbs as $db ) {
@@ -545,19 +533,51 @@ class LoadBalancer {
return;
}
if ( $this->mConns['foreignUsed'][$serverIndex][$wiki] !== $conn ) {
- throw new MWException( __METHOD__.": connection not found, has the connection been freed already?" );
+ throw new MWException( __METHOD__ . ": connection not found, has the connection been freed already?" );
}
$conn->setLBInfo( 'foreignPoolRefCount', --$refCount );
if ( $refCount <= 0 ) {
$this->mConns['foreignFree'][$serverIndex][$wiki] = $conn;
unset( $this->mConns['foreignUsed'][$serverIndex][$wiki] );
- wfDebug( __METHOD__.": freed connection $serverIndex/$wiki\n" );
+ wfDebug( __METHOD__ . ": freed connection $serverIndex/$wiki\n" );
} else {
- wfDebug( __METHOD__.": reference count for $serverIndex/$wiki reduced to $refCount\n" );
+ wfDebug( __METHOD__ . ": reference count for $serverIndex/$wiki reduced to $refCount\n" );
}
}
/**
+ * Get a database connection handle reference
+ *
+ * The handle's methods wrap simply wrap those of a DatabaseBase handle
+ *
+ * @see LoadBalancer::getConnection() for parameter information
+ *
+ * @param integer $db
+ * @param mixed $groups
+ * @param string $wiki
+ * @return DBConnRef
+ */
+ public function getConnectionRef( $db, $groups = array(), $wiki = false ) {
+ return new DBConnRef( $this, $this->getConnection( $db, $groups, $wiki ) );
+ }
+
+ /**
+ * Get a database connection handle reference without connecting yet
+ *
+ * The handle's methods wrap simply wrap those of a DatabaseBase handle
+ *
+ * @see LoadBalancer::getConnection() for parameter information
+ *
+ * @param integer $db
+ * @param mixed $groups
+ * @param string $wiki
+ * @return DBConnRef
+ */
+ public function getLazyConnectionRef( $db, $groups = array(), $wiki = false ) {
+ return new DBConnRef( $this, array( $db, $groups, $wiki ) );
+ }
+
+ /**
* Open a connection to the server given by the specified index
* Index must be an actual index into the array.
* If the server is already open, returns it.
@@ -566,7 +586,7 @@ class LoadBalancer {
* error will be available via $this->mErrorConnection.
*
* @param $i Integer server index
- * @param $wiki String wiki ID to open
+ * @param string $wiki wiki ID to open
* @return DatabaseBase
*
* @access private
@@ -575,7 +595,7 @@ class LoadBalancer {
wfProfileIn( __METHOD__ );
if ( $wiki !== false ) {
$conn = $this->openForeignConnection( $i, $wiki );
- wfProfileOut( __METHOD__);
+ wfProfileOut( __METHOD__ );
return $conn;
}
if ( isset( $this->mConns['local'][$i][0] ) ) {
@@ -585,6 +605,7 @@ class LoadBalancer {
$server['serverIndex'] = $i;
$conn = $this->reallyOpenConnection( $server, false );
if ( $conn->isOpen() ) {
+ wfDebug( "Connected to database $i at {$this->mServers[$i]['host']}\n" );
$this->mConns['local'][$i][0] = $conn;
} else {
wfDebug( "Failed to connect to database $i at {$this->mServers[$i]['host']}\n" );
@@ -611,22 +632,22 @@ class LoadBalancer {
* error will be available via $this->mErrorConnection.
*
* @param $i Integer: server index
- * @param $wiki String: wiki ID to open
+ * @param string $wiki wiki ID to open
* @return DatabaseBase
*/
function openForeignConnection( $i, $wiki ) {
- wfProfileIn(__METHOD__);
+ wfProfileIn( __METHOD__ );
list( $dbName, $prefix ) = wfSplitWikiID( $wiki );
if ( isset( $this->mConns['foreignUsed'][$i][$wiki] ) ) {
// Reuse an already-used connection
$conn = $this->mConns['foreignUsed'][$i][$wiki];
- wfDebug( __METHOD__.": reusing connection $i/$wiki\n" );
+ wfDebug( __METHOD__ . ": reusing connection $i/$wiki\n" );
} elseif ( isset( $this->mConns['foreignFree'][$i][$wiki] ) ) {
// Reuse a free connection for the same wiki
$conn = $this->mConns['foreignFree'][$i][$wiki];
unset( $this->mConns['foreignFree'][$i][$wiki] );
$this->mConns['foreignUsed'][$i][$wiki] = $conn;
- wfDebug( __METHOD__.": reusing free connection $i/$wiki\n" );
+ wfDebug( __METHOD__ . ": reusing free connection $i/$wiki\n" );
} elseif ( !empty( $this->mConns['foreignFree'][$i] ) ) {
// Reuse a connection from another wiki
$conn = reset( $this->mConns['foreignFree'][$i] );
@@ -641,22 +662,23 @@ class LoadBalancer {
$conn->tablePrefix( $prefix );
unset( $this->mConns['foreignFree'][$i][$oldWiki] );
$this->mConns['foreignUsed'][$i][$wiki] = $conn;
- wfDebug( __METHOD__.": reusing free connection from $oldWiki for $wiki\n" );
+ wfDebug( __METHOD__ . ": reusing free connection from $oldWiki for $wiki\n" );
}
} else {
// Open a new connection
$server = $this->mServers[$i];
$server['serverIndex'] = $i;
$server['foreignPoolRefCount'] = 0;
+ $server['foreign'] = true;
$conn = $this->reallyOpenConnection( $server, $dbName );
if ( !$conn->isOpen() ) {
- wfDebug( __METHOD__.": error opening connection for $i/$wiki\n" );
+ wfDebug( __METHOD__ . ": error opening connection for $i/$wiki\n" );
$this->mErrorConnection = $conn;
$conn = false;
} else {
$conn->tablePrefix( $prefix );
$this->mConns['foreignUsed'][$i][$wiki] = $conn;
- wfDebug( __METHOD__.": opened new connection for $i/$wiki\n" );
+ wfDebug( __METHOD__ . ": opened new connection for $i/$wiki\n" );
}
}
@@ -665,7 +687,7 @@ class LoadBalancer {
$refCount = $conn->getLBInfo( 'foreignPoolRefCount' );
$conn->setLBInfo( 'foreignPoolRefCount', $refCount + 1 );
}
- wfProfileOut(__METHOD__);
+ wfProfileOut( __METHOD__ );
return $conn;
}
@@ -677,7 +699,7 @@ class LoadBalancer {
* @return bool
*/
function isOpen( $index ) {
- if( !is_integer( $index ) ) {
+ if ( !is_integer( $index ) ) {
return false;
}
return (bool)$this->getAnyOpenConnection( $index );
@@ -690,23 +712,20 @@ class LoadBalancer {
*
* @param $server
* @param $dbNameOverride bool
+ * @throws MWException
* @return DatabaseBase
*/
function reallyOpenConnection( $server, $dbNameOverride = false ) {
- if( !is_array( $server ) ) {
+ if ( !is_array( $server ) ) {
throw new MWException( 'You must update your load-balancing configuration. ' .
'See DefaultSettings.php entry for $wgDBservers.' );
}
- $host = $server['host'];
- $dbname = $server['dbname'];
-
if ( $dbNameOverride !== false ) {
- $server['dbname'] = $dbname = $dbNameOverride;
+ $server['dbname'] = $dbNameOverride;
}
# Create object
- wfDebug( "Connecting to $host $dbname...\n" );
try {
$db = DatabaseBase::factory( $server['type'], $server );
} catch ( DBConnectionError $e ) {
@@ -715,11 +734,6 @@ class LoadBalancer {
$db = $e->db;
}
- if ( $db->isOpen() ) {
- wfDebug( "Connected to $host $dbname.\n" );
- } else {
- wfDebug( "Connection failed to $host $dbname.\n" );
- }
$db->setLBInfo( $server );
if ( isset( $server['fakeSlaveLag'] ) ) {
$db->setFakeSlaveLag( $server['fakeSlaveLag'] );
@@ -731,24 +745,24 @@ class LoadBalancer {
}
/**
- * @param $conn
* @throws DBConnectionError
+ * @return bool
*/
- function reportConnectionError( &$conn ) {
- wfProfileIn( __METHOD__ );
+ private function reportConnectionError() {
+ $conn = $this->mErrorConnection; // The connection which caused the error
if ( !is_object( $conn ) ) {
// No last connection, probably due to all servers being too busy
wfLogDBError( "LB failure with no last connection. Connection error: {$this->mLastError}\n" );
- $conn = new Database;
+
// If all servers were busy, mLastError will contain something sensible
- throw new DBConnectionError( $conn, $this->mLastError );
+ throw new DBConnectionError( null, $this->mLastError );
} else {
$server = $conn->getProperty( 'mServer' );
wfLogDBError( "Connection error: {$this->mLastError} ({$server})\n" );
- $conn->reportConnectionError( "{$this->mLastError} ({$server})" );
+ $conn->reportConnectionError( "{$this->mLastError} ({$server})" ); // throws DBConnectionError
}
- wfProfileOut( __METHOD__ );
+ return false; /* not reached */
}
/**
@@ -853,7 +867,7 @@ class LoadBalancer {
*/
function closeAll() {
foreach ( $this->mConns as $conns2 ) {
- foreach ( $conns2 as $conns3 ) {
+ foreach ( $conns2 as $conns3 ) {
foreach ( $conns3 as $conn ) {
$conn->close();
}
@@ -909,7 +923,9 @@ class LoadBalancer {
foreach ( $this->mConns as $conns2 ) {
foreach ( $conns2 as $conns3 ) {
foreach ( $conns3 as $conn ) {
- $conn->commit( __METHOD__ );
+ if ( $conn->trxLevel() ) {
+ $conn->commit( __METHOD__, 'flush' );
+ }
}
}
}
@@ -926,8 +942,8 @@ class LoadBalancer {
continue;
}
foreach ( $conns2[$masterIndex] as $conn ) {
- if ( $conn->writesOrCallbacksPending() ) {
- $conn->commit( __METHOD__ );
+ if ( $conn->trxLevel() && $conn->writesOrCallbacksPending() ) {
+ $conn->commit( __METHOD__, 'flush' );
}
}
}
@@ -954,10 +970,11 @@ class LoadBalancer {
* @return bool
*/
function allowLagged( $mode = null ) {
- if ( $mode === null) {
+ if ( $mode === null ) {
return $this->mAllowLagged;
}
$this->mAllowLagged = $mode;
+ return $this->mAllowLagged;
}
/**
@@ -999,7 +1016,7 @@ class LoadBalancer {
* May attempt to open connections to slaves on the default DB. If there is
* no lag, the maximum lag will be reported as -1.
*
- * @param $wiki string Wiki ID, or false for the default database
+ * @param string $wiki Wiki ID, or false for the default database
*
* @return array ( host, max lag, index of max lagged host )
*/
@@ -1084,3 +1101,46 @@ class LoadBalancer {
$this->mLagTimes = null;
}
}
+
+/**
+ * Helper class to handle automatically marking connectons as reusable (via RAII pattern)
+ * as well handling deferring the actual network connection until the handle is used
+ *
+ * @ingroup Database
+ * @since 1.22
+ */
+class DBConnRef implements IDatabase {
+ /** @var LoadBalancer */
+ protected $lb;
+ /** @var DatabaseBase|null */
+ protected $conn;
+ /** @var Array|null */
+ protected $params;
+
+ /**
+ * @param $lb LoadBalancer
+ * @param $conn DatabaseBase|array Connection or (server index, group, wiki ID) array
+ */
+ public function __construct( LoadBalancer $lb, $conn ) {
+ $this->lb = $lb;
+ if ( $conn instanceof DatabaseBase ) {
+ $this->conn = $conn;
+ } else {
+ $this->params = $conn;
+ }
+ }
+
+ public function __call( $name, $arguments ) {
+ if ( $this->conn === null ) {
+ list( $db, $groups, $wiki ) = $this->params;
+ $this->conn = $this->lb->getConnection( $db, $groups, $wiki );
+ }
+ return call_user_func_array( array( $this->conn, $name ), $arguments );
+ }
+
+ function __destruct() {
+ if ( $this->conn !== null ) {
+ $this->lb->reuseConnection( $this->conn );
+ }
+ }
+}
generated by cgit v1.2.2 (git 2.25.0) at 2024-04-30 18:49:39 +0000