aee1af4e0e
git-svn-id: file:///home/shish/svn/shimmie2/trunk@1004 7f39781d-f577-437e-ae19-be835c7a54ca
507 lines
13 KiB
PHP
507 lines
13 KiB
PHP
<?php
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require_once "compat.inc.php";
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$ADODB_CACHE_DIR=sys_get_temp_dir();
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require_once "lib/adodb/adodb.inc.php";
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/* Querylet {{{
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* A fragment of a query, used to build large search queries
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*/
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class Querylet {
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var $sql;
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var $variables;
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public function Querylet($sql, $variables=array()) {
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$this->sql = $sql;
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$this->variables = $variables;
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}
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public function append($querylet) {
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assert(!is_null($querylet));
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$this->sql .= $querylet->sql;
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$this->variables = array_merge($this->variables, $querylet->variables);
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}
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public function append_sql($sql) {
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$this->sql .= $sql;
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}
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public function add_variable($var) {
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$this->variables[] = $var;
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}
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}
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class TagQuerylet {
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var $tag;
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var $positive;
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public function TagQuerylet($tag, $positive) {
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$this->tag = $tag;
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$this->positive = $positive;
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}
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}
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class ImgQuerylet {
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var $qlet;
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var $positive;
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public function ImgQuerylet($qlet, $positive) {
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$this->qlet = $qlet;
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$this->positive = $positive;
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}
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}
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// }}}
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// {{{ dbengines
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class DBEngine {
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var $name = null;
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var $auto_increment = null;
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var $create_table_extras = "";
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}
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class MySQL extends DBEngine {
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var $name = "mysql";
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var $auto_increment = "INTEGER PRIMARY KEY auto_increment";
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var $create_table_extras = "TYPE=INNODB DEFAULT CHARSET='utf8'";
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function init($db) {
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$db->Execute("SET NAMES utf8;");
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}
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}
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class PostgreSQL extends DBEngine {
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var $name = "pgsql";
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var $auto_increment = "SERIAL PRIMARY KEY";
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function init($db) {
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}
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}
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//}}}
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/*
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* A class for controlled database access, available through "global $database"
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*/
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class Database {
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var $db;
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var $extensions;
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var $get_images = "SELECT images.*,UNIX_TIMESTAMP(posted) AS posted_timestamp FROM images ";
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var $cache_hits = 0, $cache_misses = 0;
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var $engine = null;
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/*
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* Create a new database object using connection info
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* stored in config.php in the root shimmie folder
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*/
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public function Database() {
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if(is_readable("config.php")) {
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require_once "config.php";
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$this->engine = new MySQL();
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$this->db = @NewADOConnection($database_dsn);
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$this->use_memcache = isset($memcache);
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if($this->db) {
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$this->db->SetFetchMode(ADODB_FETCH_ASSOC);
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$this->engine->init($this->db);
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}
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else {
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$version = VERSION;
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print "
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<html>
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<head>
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<title>Internal error - Shimmie-$version</title>
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</head>
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<body>
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Internal error: Could not connect to database
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</body>
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</html>
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";
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exit;
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}
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if($this->use_memcache) {
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$this->memcache = new Memcache;
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$this->memcache->pconnect('localhost', 11211) or ($this->use_memcache = false);
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}
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}
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else {
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header("Location: install.php");
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exit;
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}
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}
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// memcache {{{
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public function cache_get($key) {
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assert(!is_null($key));
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if($this->use_memcache) {
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$val = $this->memcache->get($key);
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if($val) {
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$this->cache_hits++;
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return $val;
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}
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else {
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$this->cache_misses++;
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}
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}
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return false;
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}
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public function cache_set($key, $val, $time=0) {
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assert(!is_null($key));
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if($this->use_memcache) {
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$this->memcache->set($key, $val, false, $time);
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}
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}
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public function cache_delete($key) {
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assert(!is_null($key));
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if($this->use_memcache) {
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$this->memcache->delete($key);
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}
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}
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// }}}
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// misc {{{
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public function count_images($tags=array()) {
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if(count($tags) == 0) {
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return $this->db->GetOne("SELECT COUNT(*) FROM images");
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}
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else {
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$querylet = $this->build_search_querylet($tags);
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$result = $this->execute($querylet->sql, $querylet->variables);
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return $result->RecordCount();
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}
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}
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public function count_pages($tags=array()) {
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global $config;
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$images_per_page = $config->get_int('index_width') * $config->get_int('index_height');
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return ceil($this->count_images($tags) / $images_per_page);
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}
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public function execute($query, $args=array()) {
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$result = $this->db->Execute($query, $args);
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if($result === False) {
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print "SQL Error: " . $this->db->ErrorMsg();
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print "<br>Query: $query";
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print "<br>Args: "; print_r($args);
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exit;
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}
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return $result;
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}
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public function get_all($query, $args=array()) {
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$result = $this->db->GetAll($query, $args);
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if($result === False) {
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print "SQL Error: " . $this->db->ErrorMsg();
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print "<br>Query: $query";
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print "<br>Args: "; print_r($args);
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exit;
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}
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return $result;
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}
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public function get_row($query, $args=array()) {
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$result = $this->db->GetRow($query, $args);
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if($result === False) {
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print "SQL Error: " . $this->db->ErrorMsg();
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print "<br>Query: $query";
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print "<br>Args: "; print_r($args);
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exit;
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}
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if(count($result) == 0) {
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return null;
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}
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else {
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return $result;
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}
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}
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public function upgrade_schema($filename) {
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$this->install_schema($filename);
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}
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public function install_schema($filename) {
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//print "<br>upgrading $filename";
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global $config;
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if($config->get_bool("in_upgrade")) return;
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$config->set_bool("in_upgrade", true);
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require_once "lib/adodb/adodb-xmlschema03.inc.php";
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$schema = new adoSchema($this->db);
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$sql = $schema->ParseSchema($filename);
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//echo "<pre>"; var_dump($sql); echo "</pre>";
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$result = $schema->ExecuteSchema();
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if(!$result) {
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die("Error creating tables from XML schema ($filename)");
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}
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$config->set_bool("in_upgrade", false);
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}
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// }}}
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// tags {{{
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public function resolve_alias($tag) {
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assert(is_string($tag));
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$newtag = $this->db->GetOne("SELECT newtag FROM aliases WHERE oldtag=?", array($tag));
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if(!empty($newtag)) {
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return $newtag;
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} else {
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return $tag;
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}
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}
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public function sanitise($tag) {
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assert(is_string($tag));
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$tag = preg_replace("/[\s?*]/", "", $tag);
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$tag = preg_replace("/\.+/", ".", $tag);
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$tag = preg_replace("/^(\.+[\/\\\\])+/", "", $tag);
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return $tag;
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}
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private function build_search_querylet($terms) {
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$tag_querylets = array();
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$img_querylets = array();
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$positive_tag_count = 0;
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$negative_tag_count = 0;
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// turn each term into a specific type of querylet
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foreach($terms as $term) {
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$negative = false;
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if((strlen($term) > 0) && ($term[0] == '-')) {
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$negative = true;
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$term = substr($term, 1);
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}
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$term = $this->resolve_alias($term);
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$stpe = new SearchTermParseEvent($term);
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send_event($stpe);
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if($stpe->is_querylet_set()) {
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$img_querylets[] = new ImgQuerylet($stpe->get_querylet(), !$negative);
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}
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else {
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$term = str_replace("*", "%", $term);
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$term = str_replace("?", "_", $term);
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if(!preg_match("/^[%_]+$/", $term)) {
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$tag_querylets[] = new TagQuerylet($term, !$negative);
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}
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}
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}
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// merge all the tag querylets into one generic one
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$sql = "0";
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$terms = array();
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foreach($tag_querylets as $tq) {
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$sign = $tq->positive ? "+" : "-";
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$sql .= " $sign (tag LIKE ?)";
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$terms[] = $tq->tag;
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if($sign == "+") $positive_tag_count++;
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else $negative_tag_count++;
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}
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$tag_search = new Querylet($sql, $terms);
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// merge all the image metadata searches into one generic querylet
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$n = 0;
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$sql = "";
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$terms = array();
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foreach($img_querylets as $iq) {
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if($n++ > 0) $sql .= " AND";
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if(!$iq->positive) $sql .= " NOT";
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$sql .= " (" . $iq->qlet->sql . ")";
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$terms = array_merge($terms, $iq->qlet->variables);
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}
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$img_search = new Querylet($sql, $terms);
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// no tags, do a simple search (+image metadata if we have any)
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if($positive_tag_count + $negative_tag_count == 0) {
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$query = new Querylet($this->get_images);
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if(strlen($img_search->sql) > 0) {
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$query->append_sql(" WHERE ");
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$query->append($img_search);
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}
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}
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// one positive tag (a common case), do an optimised search
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else if($positive_tag_count == 1 && $negative_tag_count == 0) {
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$query = new Querylet(
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// MySQL is braindead, and does a full table scan on images, running the subquery once for each row -_-
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// "{$this->get_images} WHERE images.id IN (SELECT image_id FROM tags WHERE tag LIKE ?) ",
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"
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SELECT images.*, UNIX_TIMESTAMP(posted) AS posted_timestamp
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FROM tags, image_tags, images
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WHERE
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tag LIKE ?
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AND tags.id = image_tags.tag_id
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AND image_tags.image_id = images.id
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",
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$tag_search->variables);
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if(strlen($img_search->sql) > 0) {
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$query->append_sql(" AND ");
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$query->append($img_search);
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}
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}
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// more than one positive tag, or more than zero negative tags
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else {
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$s_tag_array = array_map("sql_escape", $tag_search->variables);
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$s_tag_list = join(', ', $s_tag_array);
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$tag_id_array = array();
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$tags_ok = true;
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foreach($tag_search->variables as $tag) {
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$tag_ids = $this->db->GetCol("SELECT id FROM tags WHERE tag LIKE ?", array($tag));
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$tag_id_array = array_merge($tag_id_array, $tag_ids);
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$tags_ok = count($tag_ids) > 0;
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if(!$tags_ok) break;
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}
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if($tags_ok) {
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$tag_id_list = join(', ', $tag_id_array);
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$subquery = new Querylet("
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SELECT images.*, SUM({$tag_search->sql}) AS score
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FROM images
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LEFT JOIN image_tags ON image_tags.image_id = images.id
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JOIN tags ON image_tags.tag_id = tags.id
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WHERE tags.id IN ({$tag_id_list})
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GROUP BY images.id
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HAVING score = ?",
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array_merge(
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$tag_search->variables,
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array($positive_tag_count)
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)
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);
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$query = new Querylet("
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SELECT *, UNIX_TIMESTAMP(posted) AS posted_timestamp
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FROM ({$subquery->sql}) AS images ", $subquery->variables);
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if(strlen($img_search->sql) > 0) {
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$query->append_sql(" WHERE ");
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$query->append($img_search);
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}
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}
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else {
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# there are no results, "where 1=0" should shortcut things
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$query = new Querylet("
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SELECT images.*
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FROM images
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WHERE 1=0
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");
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}
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}
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return $query;
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}
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public function delete_tags_from_image($image_id) {
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assert(is_numeric($image_id));
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$this->execute("UPDATE tags SET count = count - 1 WHERE id IN (SELECT tag_id FROM image_tags WHERE image_id = ?)", array($image_id));
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$this->execute("DELETE FROM image_tags WHERE image_id=?", array($image_id));
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}
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public function set_tags($image_id, $tags) {
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assert(is_numeric($image_id));
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$tags = tag_explode($tags);
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$tags = array_map(array($this, 'resolve_alias'), $tags);
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$tags = array_map(array($this, 'sanitise'), $tags);
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$tags = array_iunique($tags); // remove any duplicate tags
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// delete old
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$this->delete_tags_from_image($image_id);
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// insert each new tag
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foreach($tags as $tag) {
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$this->execute("INSERT IGNORE INTO tags(tag) VALUES (?)", array($tag));
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$this->execute("INSERT INTO image_tags(image_id, tag_id) VALUES(?, (SELECT id FROM tags WHERE tag = ?))", array($image_id, $tag));
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$this->execute("UPDATE tags SET count = count + 1 WHERE tag = ?", array($tag));
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}
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}
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public function set_source($image_id, $source) {
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assert(is_numeric($image_id));
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if(empty($source)) $source = null;
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$this->execute("UPDATE images SET source=? WHERE id=?", array($source, $image_id));
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}
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// }}}
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// images {{{
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public function get_images($start, $limit, $tags=array()) {
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$images = array();
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assert(is_numeric($start) && $start >= 0);
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assert(is_numeric($limit) && $limit > 0);
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if($start < 0) $start = 0;
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if($limit < 1) $limit = 1;
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if(count($tags) == 0) {
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$result = $this->execute("{$this->get_images} ORDER BY id DESC LIMIT ? OFFSET ?", array($limit, $start));
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}
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else {
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$querylet = $this->build_search_querylet($tags);
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$querylet->append(new Querylet("ORDER BY images.id DESC LIMIT ? OFFSET ?", array($limit, $start)));
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$result = $this->execute($querylet->sql, $querylet->variables);
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}
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while(!$result->EOF) {
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$images[] = new Image($result->fields);
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$result->MoveNext();
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}
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return $images;
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}
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public function get_next_image($id, $tags=array(), $next=true) {
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assert(is_numeric($id));
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assert(is_array($tags));
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assert(is_bool($next));
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if($next) {
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$gtlt = "<";
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$dir = "DESC";
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}
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else {
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$gtlt = ">";
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$dir = "ASC";
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}
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if(count($tags) == 0) {
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$row = $this->db->GetRow("{$this->get_images} WHERE images.id $gtlt ? ORDER BY images.id $dir LIMIT 1", array((int)$id));
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}
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else {
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$tags[] = "id$gtlt$id";
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$querylet = $this->build_search_querylet($tags);
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$querylet->append_sql(" ORDER BY images.id $dir LIMIT 1");
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$row = $this->db->GetRow($querylet->sql, $querylet->variables);
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}
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return ($row ? new Image($row) : null);
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}
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public function get_prev_image($id, $tags=array()) {
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return $this->get_next_image($id, $tags, false);
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}
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public function get_image($id) {
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assert(is_numeric($id));
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$image = null;
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$row = $this->db->GetRow("{$this->get_images} WHERE images.id=?", array($id));
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return ($row ? new Image($row) : null);
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}
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public function get_random_image($tags=array()) {
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$max = $this->count_images($tags);
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$rand = mt_rand(0, $max);
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$set = $this->get_images($rand, 1, $tags);
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if(count($set) > 0) return $set[0];
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else return null;
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}
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public function get_image_by_hash($hash) {
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assert(is_string($hash));
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$image = null;
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$row = $this->db->GetRow("{$this->get_images} WHERE hash=?", array($hash));
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return ($row ? new Image($row) : null);
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}
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public function remove_image($id) {
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$this->execute("DELETE FROM images WHERE id=?", array($id));
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}
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// }}}
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}
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?>
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