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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  // maximum normal clock offset
50  $grace = 60;
51 
52  # Find bounding revision IDs
53  $dbw = $this->getDB( DB_PRIMARY );
54  $revisionTable = $dbw->tableName( 'revision' );
55  $res = $dbw->query( "SELECT MIN(rev_id) as minrev, MAX(rev_id) as maxrev FROM $revisionTable " .
56  "WHERE rev_timestamp BETWEEN '{$start}' AND '{$end}'", __METHOD__ );
57  $row = $dbw->fetchObject( $res );
58 
59  if ( $row->minrev === null ) {
60  $this->fatalError( "No revisions in search period." );
61  }
62 
63  $minRev = $row->minrev;
64  $maxRev = $row->maxrev;
65 
66  # Select all timestamps and IDs
67  $sql = "SELECT rev_id, rev_timestamp FROM $revisionTable " .
68  "WHERE rev_id BETWEEN $minRev AND $maxRev";
69  if ( $offset > 0 ) {
70  $sql .= " ORDER BY rev_id DESC";
71  $expectedSign = -1;
72  } else {
73  $expectedSign = 1;
74  }
75 
76  $res = $dbw->query( $sql, __METHOD__ );
77 
78  $lastNormal = 0;
79  $badRevs = [];
80  $numGoodRevs = 0;
81 
82  foreach ( $res as $row ) {
83  $timestamp = wfTimestamp( TS_UNIX, $row->rev_timestamp );
84  $delta = $timestamp - $lastNormal;
85  $sign = $delta == 0 ? 0 : $delta / abs( $delta );
86  if ( $sign == 0 || $sign == $expectedSign ) {
87  // Monotonic change
88  $lastNormal = $timestamp;
89  ++$numGoodRevs;
90  } elseif ( abs( $delta ) <= $grace ) {
91  // Non-monotonic change within grace interval
92  ++$numGoodRevs;
93  } else {
94  // Non-monotonic change larger than grace interval
95  $badRevs[] = $row->rev_id;
96  }
97  }
98 
99  $numBadRevs = count( $badRevs );
100  if ( $numBadRevs > $numGoodRevs ) {
101  $this->fatalError(
102  "The majority of revisions in the search interval are marked as bad.
103 
104  Are you sure the offset ($offset) has the right sign? Positive means the clock
105  was incorrectly set forward, negative means the clock was incorrectly set back.
106 
107  If the offset is right, then increase the search interval until there are enough
108  good revisions to provide a majority reference." );
109  } elseif ( $numBadRevs == 0 ) {
110  $this->output( "No bad revisions found.\n" );
111  return;
112  }
113 
114  $this->output( sprintf( "Fixing %d revisions (%.2f%% of revisions in search interval)\n",
115  $numBadRevs, $numBadRevs / ( $numGoodRevs + $numBadRevs ) * 100 ) );
116 
117  $fixup = -$offset;
118  $sql = "UPDATE $revisionTable " .
119  "SET rev_timestamp="
120  . "DATE_FORMAT(DATE_ADD(rev_timestamp, INTERVAL $fixup SECOND), '%Y%m%d%H%i%s') " .
121  "WHERE rev_id IN (" . $dbw->makeList( $badRevs ) . ')';
122  $dbw->query( $sql, __METHOD__ );
123  $this->output( "Done\n" );
124  }
125 }
126 
127 $maintClass = FixTimestamps::class;
128 require_once RUN_MAINTENANCE_IF_MAIN;
Maintenance\fatalError
fatalError( $msg, $exitCode=1)
Output a message and terminate the current script.
Definition: Maintenance.php:489
Maintenance\addDescription
addDescription( $text)
Set the description text.
Definition: Maintenance.php:329
wfTimestamp
wfTimestamp( $outputtype=TS_UNIX, $ts=0)
Get a timestamp string in one of various formats.
Definition: GlobalFunctions.php:1664
Maintenance
Abstract maintenance class for quickly writing and churning out maintenance scripts with minimal effo...
Definition: Maintenance.php:59
$res
$res
Definition: testCompression.php:57
FixTimestamps\__construct
__construct()
Default constructor.
Definition: fixTimestamps.php:37
FixTimestamps\execute
execute()
Do the actual work.
Definition: fixTimestamps.php:45
DB_PRIMARY
const DB_PRIMARY
Definition: defines.php:27
Maintenance\getDB
getDB( $db, $groups=[], $dbDomain=false)
Returns a database to be used by current maintenance script.
Definition: Maintenance.php:1362
Maintenance\addArg
addArg( $arg, $description, $required=true)
Add some args that are needed.
Definition: Maintenance.php:300
$maintClass
$maintClass
Definition: fixTimestamps.php:127
Maintenance\output
output( $out, $channel=null)
Throw some output to the user.
Definition: Maintenance.php:435
Maintenance\getArg
getArg( $argId=0, $default=null)
Get an argument.
Definition: Maintenance.php:353
FixTimestamps
Maintenance script that fixes timestamp corruption caused by one or more webservers temporarily being...
Definition: fixTimestamps.php:36