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Move feed item change detection to Feed class

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This commit is contained in:
J. King 2017-04-22 23:40:57 -04:00
parent b1b96bb806
commit 93c010d3d5
2 changed files with 120 additions and 107 deletions
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131
lib/Database.php
View file

@ -441,7 +441,7 @@ class Database {
try {
$feed = new Feed($f['url'], (string)$f['lastmodified'], $f['etag'], $f['username'], $f['password']);
if($feed->resource->isModified()) {
$feed->parse();
$feed->parse($feedID);
} else {
// if the feed hasn't changed, just compute the next fetch time and record it
$next = $this->feedNextFetch($feedID);
@ -459,110 +459,12 @@ class Database {
$this->db->rollback();
throw $e;
}
// FIXME: first perform deduplication on the feed itself
// array if items in the fetched feed
$items = $feed->data->items;
// get as many of the latest articles in the database as there are in the feed
$articles = $this->db->prepare(
'SELECT id, DATEFORMAT("unix", edited) AS edited_date, guid, url_title_hash, url_content_hash, title_content_hash FROM arsse_articles WHERE feed is ? ORDER BY edited desc limit ?',
'int', 'int'
)->run(
$feedID, sizeof($items)
)->getAll();
// arrays holding new, edited, and tentatively new items
// items may be tentatively new because we perform two passes
$new = $tentative = $edited = [];
// iterate through the articles and for each determine whether it is existing, edited, or entirely new
foreach($items as $index => $i) {
foreach($articles as $a) {
if(
// the item matches if the GUID matches...
($i->id && $i->id === $a['guid']) ||
// ... or if any one of the hashes match
$i->urlTitleHash === $a['url_title_hash'] ||
$i->urlContentHash === $a['url_content_hash'] ||
$i->titleContentHash === $a['title_content_hash']
) {
if($i->updatedDate && $i->updatedDate->getTimestamp() !== $match['edited_date']) {
// if the item has an edit timestamp and it doesn't match that of the article in the database, the the article has been edited
// we store the item index and database record ID as a key/value pair
$edited[$index] = $a['id'];
break;
} else if($i->urlTitleHash !== $a['url_title_hash'] || $i->urlContentHash !== $a['url_content_hash'] || $i->titleContentHash !== $a['title_content_hash']) {
// if any of the hashes do not match, then the article has been edited
$edited[$index] = $a['id'];
break;
} else {
// otherwise the item is unchanged and we can ignore it
break;
}
} else {
// if we don't have a match, add the item to the tentatively new list
$tentative[] = $index;
}
}
}
if(sizeof($tentative)) {
// if we need to, perform a second pass on the database looking specifically for IDs and hashes of the new items
$vId = $vHashUT = $vHashUC = $vHashTC = [];
foreach($tentative as $index) {
$i = $items[$index];
if($i->id) $vId[] = $id->id;
$vHashUT[] = $i->urlTitleHash;
$vHashUC[] = $i->urlContentHash;
$vHashTC[] = $i->titleContentHash;
}
// compile SQL IN() clauses and necessary type bindings for the four identifier lists
list($cId, $tId) = $thiis->generateIn($vId, "str");
list($cHashUT, $tHashUT) = $thiis->generateIn($vHashUT, "str");
list($cHashUC, $tHashUC) = $thiis->generateIn($vHashUC, "str");
list($cHashTC, $tHashTC) = $thiis->generateIn($vHashTC, "str");
// perform the query
$articles = $this->db->prepare(
'SELECT id, DATEFORMAT("unix", edited) AS edited_date, guid, url_title_hash, url_content_hash, title_content_hash FROM arsse_articles '.
'WHERE feed is ? and (guid in($cId) or url_title_hash in($cHashUT) or url_content_hash in($cHashUC) or title_content_hash in($cHashTC)',
'int', $tId, $tHashUT, $tHashUC, $tHashTC
)->run(
$feedID, $vId, $vHashUT, $vHashUC, $vHashTC
)->getAll();
foreach($tentative as $index) {
$i = $items[$index];
foreach($articles as $a) {
if(
// the item matches if the GUID matches...
($i->id && $i->id === $a['guid']) ||
// ... or if any one of the hashes match
$i->urlTitleHash === $a['url_title_hash'] ||
$i->urlContentHash === $a['url_content_hash'] ||
$i->titleContentHash === $a['title_content_hash']
) {
if($i->updatedDate && $i->updatedDate->getTimestamp() !== $match['edited_date']) {
// if the item has an edit timestamp and it doesn't match that of the article in the database, the the article has been edited
// we store the item index and database record ID as a key/value pair
$edited[$index] = $a['id'];
break;
} else if($i->urlTitleHash !== $a['url_title_hash'] || $i->urlContentHash !== $a['url_content_hash'] || $i->titleContentHash !== $a['title_content_hash']) {
// if any of the hashes do not match, then the article has been edited
$edited[$index] = $a['id'];
break;
} else {
// otherwise the item is unchanged and we can ignore it
break;
}
} else {
// if we don't have a match, add the item to the definite new list
$new[] = $index;
}
}
}
}
// FIXME: fetch full content when appropriate
// finally actually perform updates
foreach($new as $index) {
$this->articleAdd($feedID, $items[$index]);
foreach($feed->newItems as $item) {
$this->articleAdd($feedID, $item);
}
foreach($edited as $index => $id) {
$this->articleAdd($feedID, $items[$index], $id);
foreach($feed->changedItems as $id => $item) {
$this->articleAdd($feedID, $item, $id);
}
// lastly update the feed database itself with updated information.
$next = $this->feedNextFetch($feedID, $feed);
@ -583,12 +485,33 @@ class Database {
$this->db->commit();
return true;
}
protected function feedNextFetch(int $feedID, Feed $feed = null): \DateTime {
// FIXME: stub
return new \DateTime("now + 3 hours", new \DateTimeZone("UTC"));
}
public function articleMatchLatest(int $feedID, int $count): Db\Result {
return $this->db->prepare(
'SELECT id, DATEFORMAT("unix", edited) AS edited_date, guid, url_title_hash, url_content_hash, title_content_hash FROM arsse_articles WHERE feed is ? ORDER BY edited desc limit ?',
'int', 'int'
)->run($feedID, $count);
}
public function articleMatchIds(int $feedID, array $ids = [], array $hashesUT = [], array $hashesUC = [], array $hashesTC = []): Db\Result {
// compile SQL IN() clauses and necessary type bindings for the four identifier lists
list($cId, $tId) = $this->generateIn($ids, "str");
list($cHashUT, $tHashUT) = $this->generateIn($hashesUT, "str");
list($cHashUC, $tHashUC) = $this->generateIn($hashesUC, "str");
list($cHashTC, $tHashTC) = $this->generateIn($hashesTC, "str");
// perform the query
return $articles = $this->db->prepare(
'SELECT id, DATEFORMAT("unix", edited) AS edited_date, guid, url_title_hash, url_content_hash, title_content_hash FROM arsse_articles '.
'WHERE feed is ? and (guid in($cId) or url_title_hash in($cHashUT) or url_content_hash in($cHashUC) or title_content_hash in($cHashTC)',
'int', $tId, $tHashUT, $tHashUC, $tHashTC
)->run($feedID, $ids, $hashesUT, $hashesUC, $hashesTC);
}
public function articleAdd(int $feedID, \PicoFeed\Parser\Item $article, int $articleID = null): int {
$this->db->begin();
try {

96
lib/Feed.php
View file

@ -12,6 +12,8 @@ class Feed {
public $parser;
public $reader;
public $resource;
public $newItems = [];
public $changedItems = [];
public function __construct(string $url, string $lastModified = '', string $etag = '', string $username = '', string $password = '') {
try {
@ -26,7 +28,7 @@ class Feed {
}
}
public function parse(): bool {
public function parse(int $feedID = null): bool {
try {
$this->parser = $this->reader->getParser(
$this->resource->getUrl(),
@ -50,7 +52,7 @@ class Feed {
// identification. These feeds shouldn't be duplicated when updated. That should
// only be reserved for severely broken feeds.
foreach ($feed->items as &$f) {
foreach ($feed->items as $f) {
// Hashes used for comparison to check for updates and also to identify when an
// id doesn't exist.
$f->urlTitleHash = hash('sha256', $f->url.$f->title);
@ -80,7 +82,95 @@ class Feed {
// If there aren't any of those there is no id.
$f->id = '';
}
// if a feedID is supplied, determine which items are already in the database, which are not, and which might have been edited
if(!is_null($feedID)) {
// FIXME: first perform deduplication on items
// array if items in the fetched feed
$items = $feed->items;
// get as many of the latest articles in the database as there are in the feed
$articles = Data::$db->articleMatchLatest($feedID, sizeof($items));
// arrays holding new, edited, and tentatively new items; items may be tentatively new because we perform two passes
$new = $tentative = $edited = [];
// iterate through the articles and for each determine whether it is existing, edited, or entirely new
foreach($items as $index => $i) {
foreach($articles as $a) {
if(
// the item matches if the GUID matches...
($i->id && $i->id === $a['guid']) ||
// ... or if any one of the hashes match
$i->urlTitleHash === $a['url_title_hash'] ||
$i->urlContentHash === $a['url_content_hash'] ||
$i->titleContentHash === $a['title_content_hash']
) {
if($i->updatedDate && $i->updatedDate->getTimestamp() !== $match['edited_date']) {
// if the item has an edit timestamp and it doesn't match that of the article in the database, the the article has been edited
// we store the item index and database record ID as a key/value pair
$edited[$index] = $a['id'];
break;
} else if($i->urlTitleHash !== $a['url_title_hash'] || $i->urlContentHash !== $a['url_content_hash'] || $i->titleContentHash !== $a['title_content_hash']) {
// if any of the hashes do not match, then the article has been edited
$edited[$index] = $a['id'];
break;
} else {
// otherwise the item is unchanged and we can ignore it
break;
}
} else {
// if we don't have a match, add the item to the tentatively new list
$tentative[] = $index;
}
}
}
if(sizeof($tentative)) {
// if we need to, perform a second pass on the database looking specifically for IDs and hashes of the new items
$ids = $hashesUT = $hashesUC = $hashesTC = [];
foreach($tentative as $index) {
$i = $items[$index];
if($i->id) $ids[] = $id->id;
$hashesUT[] = $i->urlTitleHash;
$hashesUC[] = $i->urlContentHash;
$hashesTC[] = $i->titleContentHash;
}
$articles = Data::$db->articleMatchIds($feedID, $ids, $hashesUT, $hashesUC, $hashesTC);
foreach($tentative as $index) {
$i = $items[$index];
foreach($articles as $a) {
if(
// the item matches if the GUID matches...
($i->id && $i->id === $a['guid']) ||
// ... or if any one of the hashes match
$i->urlTitleHash === $a['url_title_hash'] ||
$i->urlContentHash === $a['url_content_hash'] ||
$i->titleContentHash === $a['title_content_hash']
) {
if($i->updatedDate && $i->updatedDate->getTimestamp() !== $match['edited_date']) {
// if the item has an edit timestamp and it doesn't match that of the article in the database, the the article has been edited
// we store the item index and database record ID as a key/value pair
$edited[$index] = $a['id'];
break;
} else if($i->urlTitleHash !== $a['url_title_hash'] || $i->urlContentHash !== $a['url_content_hash'] || $i->titleContentHash !== $a['title_content_hash']) {
// if any of the hashes do not match, then the article has been edited
$edited[$index] = $a['id'];
break;
} else {
// otherwise the item is unchanged and we can ignore it
break;
}
} else {
// if we don't have a match, add the item to the definite new list
$new[] = $index;
}
}
}
}
// FIXME: fetch full content when appropriate
foreach($new as $index) {
$this->newItems[] = $items[$index];
}
foreach($edited as $index => $id) {
$this->changedItems[$id] = $items[$index];
}
}
$this->data = $feed;
return true;
}