From b82af8c382441bddfb9fccf5828ff7e7c61682ac Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <fox@madoka.spb.ru>
Date: Tue, 23 Aug 2005 06:46:48 +0100
Subject: use transactions in feed update process, better handle feeds without
 entry dates (schema updated)

---
 functions.php | 67 +++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 45 insertions(+), 22 deletions(-)

(limited to 'functions.php')

diff --git a/functions.php b/functions.php
index ef3bfa98e..36f191e83 100644
--- a/functions.php
+++ b/functions.php
@@ -3,6 +3,8 @@
 
 	function update_all_feeds($link, $fetch) {
 
+		pg_query("BEGIN");
+
 		if (!$fetch) {
 
 			$result = pg_query($link, "SELECT feed_url,id FROM ttrss_feeds WHERE
@@ -21,6 +23,8 @@
 			$num_unread += update_rss_feed($link, $line["feed_url"], $line["id"]);
 		}
 
+		pg_query("COMMIT");
+
 	}
 
 	function update_rss_feed($link, $feed_url, $feed) {
@@ -30,13 +34,14 @@
 		$num_unread = 0;
 	
 		if ($rss) {
-	
+
+			pg_query("BEGIN");
+
 			$result = pg_query("SELECT title FROM ttrss_feeds WHERE id = '$feed'");
 
 			$registered_title = pg_fetch_result($result, 0, "title");
 
 			if (!$registered_title) {
-
 				$feed_title = $rss->channel["title"];
 				pg_query("UPDATE ttrss_feeds SET title = '$feed_title' WHERE id = '$feed'");
 			}
@@ -49,15 +54,22 @@
 				if (!$entry_guid) $entry_guid = $item["link"];
 	
 				$entry_timestamp = "";
-				
+
 				$rss_2_date = $item['pubdate'];
 				$rss_1_date = $item['dc']['date'];
 				$atom_date = $item['issued'];
 			
+				$no_orig_date = 'false';
+			
 				if ($atom_date != "") $entry_timestamp = parse_w3cdtf($atom_date);
 				if ($rss_1_date != "") $entry_timestamp = parse_w3cdtf($rss_1_date);
 				if ($rss_2_date != "") $entry_timestamp = strtotime($rss_2_date);
-				if ($entry_timestamp == "") $entry_timestamp = 0;
+//				if ($rss_3_date != "") $entry_timestamp = strtotime($rss_3_date);
+				
+				if ($entry_timestamp == "") {
+					$entry_timestamp = time();
+					$no_orig_date = 'true';
+				}
 
 				if (!$entry_timestamp) continue;
 
@@ -77,7 +89,7 @@
 	
 				$result = pg_query($link, "
 					SELECT 
-						id,unread,md5_hash,last_read,
+						id,unread,md5_hash,last_read,no_orig_date,title,
 						EXTRACT(EPOCH FROM updated) as updated_timestamp
 					FROM
 						ttrss_entries 
@@ -89,11 +101,12 @@
 					$entry_timestamp = strftime("%Y/%m/%d %H:%M:%S", $entry_timestamp);
 	
 					$query = "INSERT INTO ttrss_entries 
-							(title, guid, link, updated, content, feed_id, md5_hash) 
+							(title, guid, link, updated, content, feed_id, 
+								md5_hash, no_orig_date) 
 						VALUES
 							('$entry_title', '$entry_guid', '$entry_link', 
 								'$entry_timestamp', '$entry_content', '$feed', 
-								'$content_md5')";
+								'$content_md5', $no_orig_date)";
 	
 					$result = pg_query($link, $query);
 
@@ -108,33 +121,41 @@
 	
 					$unread = pg_fetch_result($result, 0, "unread");
 					$md5_hash = pg_fetch_result($result, 0, "md5_hash");
-					
-//					if ($md5_hash != $content_md5 && CONTENT_CHECK_MD5) 
-//						$unread = "true";
+					$no_orig_date = pg_fetch_result($result, 0, "no_orig_date");
+					$orig_title = pg_fetch_result($result, 0, "title");
 
-					if (!$last_read || $md5_hash != $content_md5) {
-						$last_read = 'null';
+					// disable update detection for posts which didn't have correct
+					// publishment date, because they will always register as updated
+					// sadly this doesn't catch feed generators which input current date 
+					// in posts all the time (some planets do this)
+
+					if ($no_orig_date != 't' && (!$last_read || $md5_hash != $content_md5)) {
+						$last_read_qpart = 'last_read = null,';
 					} else {
-						$last_read = "'$last_read'";
+						$last_read_qpart = '';
 					}
 
-//					if ($unread || !CONTENT_CHECK_MD5) {
-//						$updated_query_part = "updated = '$entry_timestamp',";
-//					}
+					// mark post as updated on title change
+					// maybe we should mark it as unread instead?
 
-//					if ($updated_timestamp > $entry_timestamp) {
-//						$unread = "true";
-//						print "$updated_timestamp : $entry_timestamp<br>";
-//					}			
+					if ($orig_title != $entry_title) {
+						$last_read_qpart = 'last_read = null,';
+					}
+
+					// don't bother updating timestamps on posts with broken pubDate
+					
+					if ($no_orig_date != 't') {
+						$update_timestamp_qpart = "updated = '$entry_timestamp_fmt',";
+					}
 
 					$query = "UPDATE ttrss_entries 
 						SET 
 							title ='$entry_title', 
 							link = '$entry_link', 
-							updated = '$entry_timestamp_fmt',
+							$update_timestamp_qpart
+							$last_read_qpart
 							content = '$entry_content',
 							md5_hash = '$content_md5',
-							last_read = $last_read,
 							unread = '$unread'
 						WHERE
 							id = '$entry_id'";
@@ -151,6 +172,8 @@
 				$result = pg_query($link, "UPDATE ttrss_feeds SET last_updated = NOW()");
 			}
 
+			pg_query("COMMIT");
+
 		}
 
 	}
-- 
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