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fixTimestamps.php
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1 <?php
28 require_once __DIR__ . '/Maintenance.php';
29 
36 class FixTimestamps extends Maintenance {
37  public function __construct() {
38  parent::__construct();
39  $this->addDescription( '' );
40  $this->addArg( 'offset', '' );
41  $this->addArg( 'start', 'Starting timestamp' );
42  $this->addArg( 'end', 'Ending timestamp' );
43  }
44 
45  public function execute() {
46  $offset = $this->getArg( 0 ) * 3600;
47  $start = $this->getArg( 1 );
48  $end = $this->getArg( 2 );
49  $grace = 60; // maximum normal clock offset
50 
51  # Find bounding revision IDs
52  $dbw = $this->getDB( DB_MASTER );
53  $revisionTable = $dbw->tableName( 'revision' );
54  $res = $dbw->query( "SELECT MIN(rev_id) as minrev, MAX(rev_id) as maxrev FROM $revisionTable " .
55  "WHERE rev_timestamp BETWEEN '{$start}' AND '{$end}'", __METHOD__ );
56  $row = $dbw->fetchObject( $res );
57 
58  if ( is_null( $row->minrev ) ) {
59  $this->fatalError( "No revisions in search period." );
60  }
61 
62  $minRev = $row->minrev;
63  $maxRev = $row->maxrev;
64 
65  # Select all timestamps and IDs
66  $sql = "SELECT rev_id, rev_timestamp FROM $revisionTable " .
67  "WHERE rev_id BETWEEN $minRev AND $maxRev";
68  if ( $offset > 0 ) {
69  $sql .= " ORDER BY rev_id DESC";
70  $expectedSign = -1;
71  } else {
72  $expectedSign = 1;
73  }
74 
75  $res = $dbw->query( $sql, __METHOD__ );
76 
77  $lastNormal = 0;
78  $badRevs = [];
79  $numGoodRevs = 0;
80 
81  foreach ( $res as $row ) {
82  $timestamp = wfTimestamp( TS_UNIX, $row->rev_timestamp );
83  $delta = $timestamp - $lastNormal;
84  $sign = $delta == 0 ? 0 : $delta / abs( $delta );
85  if ( $sign == 0 || $sign == $expectedSign ) {
86  // Monotonic change
87  $lastNormal = $timestamp;
88  ++$numGoodRevs;
89  continue;
90  } elseif ( abs( $delta ) <= $grace ) {
91  // Non-monotonic change within grace interval
92  ++$numGoodRevs;
93  continue;
94  } else {
95  // Non-monotonic change larger than grace interval
96  $badRevs[] = $row->rev_id;
97  }
98  }
99 
100  $numBadRevs = count( $badRevs );
101  if ( $numBadRevs > $numGoodRevs ) {
102  $this->fatalError(
103  "The majority of revisions in the search interval are marked as bad.
104 
105  Are you sure the offset ($offset) has the right sign? Positive means the clock
106  was incorrectly set forward, negative means the clock was incorrectly set back.
107 
108  If the offset is right, then increase the search interval until there are enough
109  good revisions to provide a majority reference." );
110  } elseif ( $numBadRevs == 0 ) {
111  $this->output( "No bad revisions found.\n" );
112  exit( 0 );
113  }
114 
115  $this->output( sprintf( "Fixing %d revisions (%.2f%% of revisions in search interval)\n",
116  $numBadRevs, $numBadRevs / ( $numGoodRevs + $numBadRevs ) * 100 ) );
117 
118  $fixup = -$offset;
119  $sql = "UPDATE $revisionTable " .
120  "SET rev_timestamp="
121  . "DATE_FORMAT(DATE_ADD(rev_timestamp, INTERVAL $fixup SECOND), '%Y%m%d%H%i%s') " .
122  "WHERE rev_id IN (" . $dbw->makeList( $badRevs ) . ')';
123  $dbw->query( $sql, __METHOD__ );
124  $this->output( "Done\n" );
125  }
126 }
127 
128 $maintClass = FixTimestamps::class;
129 require_once RUN_MAINTENANCE_IF_MAIN;
getArg( $argId=0, $default=null)
Get an argument.
const RUN_MAINTENANCE_IF_MAIN
Definition: Maintenance.php:39
Abstract maintenance class for quickly writing and churning out maintenance scripts with minimal effo...
Definition: Maintenance.php:82
const DB_MASTER
Definition: defines.php:26
Maintenance script that fixes timestamp corruption caused by one or more webservers temporarily being...
wfTimestamp( $outputtype=TS_UNIX, $ts=0)
Get a timestamp string in one of various formats.
addDescription( $text)
Set the description text.
addArg( $arg, $description, $required=true)
Add some args that are needed.
output( $out, $channel=null)
Throw some output to the user.
fatalError( $msg, $exitCode=1)
Output a message and terminate the current script.
getDB( $db, $groups=[], $dbDomain=false)
Returns a database to be used by current maintenance script.
$maintClass