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move update daemon code to common function, reorganize backend.php (patch from landure)

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This commit is contained in:
Andrew Dolgov 2008-01-26 06:33:59 +01:00
parent 34459667e2
commit 45004d4340
5 changed files with 533 additions and 541 deletions
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137
backend.php
View file

@ -145,35 +145,37 @@
if (!sanity_check($link)) { return; }
if ($op == "rpc") {
switch($op) { // Select action according to $op value.
case "rpc":
// Handle remote procedure calls.
handle_rpc_request($link);
}
if ($op == "feeds") {
break; // rpc
case "feeds":
$tags = $_GET["tags"];
$subop = $_GET["subop"];
if ($subop == "catchupAll") {
switch($subop) {
case "catchupAll":
db_query($link, "UPDATE ttrss_user_entries SET
last_read = NOW(),unread = false WHERE owner_uid = " . $_SESSION["uid"]);
}
break;
if ($subop == "collapse") {
case "collapse":
$cat_id = db_escape_string($_GET["cid"]);
db_query($link, "UPDATE ttrss_feed_categories SET
collapsed = NOT collapsed WHERE id = '$cat_id' AND owner_uid = " .
$_SESSION["uid"]);
return;
break;
}
outputFeedList($link, $tags);
break; // feeds
}
if ($op == "view") {
case "view":
$id = db_escape_string($_GET["id"]);
$feed_id = db_escape_string($_GET["feed"]);
@ -205,9 +207,9 @@
}
print "</reply>";
}
break; // view
if ($op == "viewfeed") {
case "viewfeed":
$print_exec_time = true;
$timing_info = getmicrotime();
@ -274,69 +276,73 @@
print_runtime_info($link);
print "</reply>";
}
break; // viewfeed
if ($op == "pref-feeds") {
case "pref-feeds":
module_pref_feeds($link);
}
break; // pref-feeds
if ($op == "pref-filters") {
case "pref-filters":
module_pref_filters($link);
}
break; // pref-filters
if ($op == "pref-labels") {
case "pref-labels":
module_pref_labels($link);
}
break; // pref-labels
if ($op == "pref-prefs") {
case "pref-prefs":
module_pref_prefs($link);
}
break; // pref-prefs
if ($op == "pref-users") {
case "pref-users":
module_pref_users($link);
}
break; // prefs-users
if ($op == "help") {
case "help":
module_help($link);
}
break; // help
if ($op == "dlg") {
case "dlg":
module_popup_dialog($link);
}
break; // dlg
if ($op == "pref-pub-items") {
case "pref-pub-items":
module_pref_pub_items($link);
}
break; // pref-pub-items
case "globalUpdateFeeds":
// update feeds of all users, may be used anonymously
if ($op == "globalUpdateFeeds") {
$result = db_query($link, "SELECT id FROM ttrss_users");
// Update all feeds needing a update.
update_daemon_common($link, 0, true, false);
while ($line = db_fetch_assoc($result)) {
$user_id = $line["id"];
// FIXME : old feed update way. To be removed.
//$result = db_query($link, "SELECT id FROM ttrss_users");
//while ($line = db_fetch_assoc($result)) {
// $user_id = $line["id"];
// print "<!-- updating feeds of uid $user_id -->";
update_all_feeds($link, false, $user_id);
}
// update_all_feeds($link, false, $user_id);
//}
print "<rpc-reply>
<message msg=\"All feeds updated\"/>
</rpc-reply>";
break; // globalUpdateFeeds
}
if ($op == "user-details") {
case "user-details":
if (WEB_DEMO_MODE || $_SESSION["access_level"] < 10) {
return;
}
/* print "<html><head>
/*
print "<html><head>
<title>Tiny Tiny RSS : User Details</title>
<link rel=\"stylesheet\" href=\"tt-rss.css\" type=\"text/css\">
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">
</head><body>"; */
</head><body>";
*/
$uid = sprintf("%d", $_GET["id"]);
@ -358,11 +364,11 @@
return;
}
# print "<h1>User Details</h1>";
// print "<h1>User Details</h1>";
$login = db_fetch_result($result, 0, "login");
# print "<h1>$login</h1>";
// print "<h1>$login</h1>";
print "<table width='100%'>";
@ -375,8 +381,8 @@
$access_level = db_fetch_result($result, 0, "access_level");
$stored_articles = db_fetch_result($result, 0, "stored_articles");
# print "<tr><td>Username</td><td>$login</td></tr>";
# print "<tr><td>Access level</td><td>$access_level</td></tr>";
// print "<tr><td>Username</td><td>$login</td></tr>";
// print "<tr><td>Access level</td><td>$access_level</td></tr>";
print "<tr><td>".__('Registered')."</td><td>$created</td></tr>";
print "<tr><td>".__('Last logged in')."</td><td>$last_login</td></tr>";
print "<tr><td>".__('Stored articles')."</td><td>$stored_articles</td></tr>";
@ -388,14 +394,16 @@
print "<tr><td>".__('Subscribed feeds count')."</td><td>$num_feeds</td></tr>";
/* $result = db_query($link, "SELECT
/*
$result = db_query($link, "SELECT
SUM(LENGTH(content)+LENGTH(title)+LENGTH(link)+LENGTH(guid)) AS db_size
FROM ttrss_user_entries,ttrss_entries
WHERE owner_uid = '$uid' AND ref_id = id");
$db_size = round(db_fetch_result($result, 0, "db_size") / 1024);
print "<tr><td>Approx. used DB size</td><td>$db_size KBytes</td></tr>"; */
print "<tr><td>Approx. used DB size</td><td>$db_size KBytes</td></tr>";
*/
print "</table>";
@ -440,13 +448,13 @@
// print "</body></html>";
}
break; // user-details
if ($op == "pref-feed-browser") {
case "pref-feed-browser":
module_pref_feed_browser($link);
}
break; // pref-feed-browser
if ($op == "publish") {
case "publish":
$key = db_escape_string($_GET["key"]);
$result = db_query($link, "SELECT login, owner_uid
@ -464,10 +472,9 @@
} else {
print "<error>User not found</error>";
}
break; // publish
}
if ($op == "rss") {
case "rss":
$feed = db_escape_string($_GET["id"]);
$user = db_escape_string($_GET["user"]);
$pass = db_escape_string($_GET["pass"]);
@ -487,10 +494,9 @@
generate_syndicated_feed($link, 0, $feed, $is_cat,
$search, $search_mode, $match_on);
}
break; // rss
}
if ($op == "labelFromSearch") {
case "labelFromSearch":
$search = db_escape_string($_GET["search"]);
$search_mode = db_escape_string($_GET["smode"]);
$match_on = db_escape_string($_GET["match"]);
@ -538,9 +544,9 @@
"INSERT INTO ttrss_labels (sql_exp,description,owner_uid)
VALUES ('$search_expr', '$title', '".$_SESSION["uid"]."')");
}
}
break; // labelFromSearch
if ($op == "getUnread") {
case "getUnread":
$login = db_escape_string($_GET["login"]);
header("Content-Type: text/plain; charset=utf-8");
@ -555,22 +561,23 @@
}
$print_exec_time = false;
}
break; // getUnread
if ($op == "digestTest") {
case "digestTest":
header("Content-Type: text/plain");
print_r(prepare_headlines_digest($link, $_SESSION["uid"]));
$print_exec_time = false;
break; // digestTest
}
if ($op == "digestSend") {
case "digestSend":
header("Content-Type: text/plain");
send_headlines_digests($link);
$print_exec_time = false;
break; // digestSend
}
} // Select action according to $op value.
// We close the connection to database.
db_close($link);
?>

151
functions.php
View file

@ -72,11 +72,17 @@
require_once "magpierss/rss_fetch.inc";
require_once 'magpierss/rss_utils.inc';
/**
* Print a timestamped debug message.
*
* @param string $msg The debug message.
* @return void
*/
function _debug($msg) {
$ts = strftime("%H:%M:%S", time());
$ts = "$ts/" . posix_getpid();
print "[$ts] $msg\n";
}
} // function _debug
function purge_feed($link, $feed_id, $purge_interval, $debug = false) {
@ -459,7 +465,7 @@
function update_rss_feed($link, $feed_url, $feed, $ignore_daemon = false) {
if (!$_GET["daemon"] && !$ignore_daemon) {
return;
return false;
}
if (defined('DAEMON_EXTENDED_DEBUG') || $_GET['xdebug']) {
@ -490,7 +496,7 @@
if (defined('DAEMON_EXTENDED_DEBUG') || $_GET['xdebug']) {
_debug("update_rss_feed: feed $feed [$feed_url] NOT FOUND/SKIPPED");
}
return;
return false;
}
$update_method = db_fetch_result($result, 0, "update_method");
@ -3356,6 +3362,13 @@
return $res;
}
/**
* Send by mail a digest of last articles.
*
* @param mixed $link The database connection.
* @param integer $limit The maximum number of articles by digest.
* @return boolean Return false if digests are not enabled.
*/
function send_headlines_digests($link, $limit = 100) {
if (!DIGEST_ENABLE) return false;
@ -5118,26 +5131,154 @@
return $url_path;
}
/**
* Purge a feed contents, marked articles excepted.
*
* @param mixed $link The database connection.
* @param integer $id The id of the feed to purge.
* @return void
*/
function clear_feed_articles($link, $id) {
$result = db_query($link, "DELETE FROM ttrss_user_entries
WHERE feed_id = '$id' AND marked = false AND owner_uid = " . $_SESSION["uid"]);
$result = db_query($link, "DELETE FROM ttrss_entries WHERE
(SELECT COUNT(int_id) FROM ttrss_user_entries WHERE ref_id = id) = 0");
}
} // function clear_feed_articles
/**
* Compute the Mozilla Firefox feed adding URL from server HOST and REQUEST_URI.
*
* @return string The Mozilla Firefox feed adding URL.
*/
function add_feed_url() {
$url_path = 'http://' . $_SERVER["HTTP_HOST"] . parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH);
$url_path .= "?op=pref-feeds&quiet=1&subop=add&feed_url=%s";
return $url_path;
}
} // function add_feed_url
/**
* Encrypt a password in SHA1.
*
* @param string $pass The password to encrypt.
* @param string $login A optionnal login.
* @return string The encrypted password.
*/
function encrypt_password($pass, $login = '') {
if ($login) {
return "SHA1X:" . sha1("$login:$pass");
} else {
return "SHA1:" . sha1($pass);
}
} // function encrypt_password
/**
* Update a feed batch.
* Used by daemons to update n feeds by run.
* Only update feed needing a update, and not being processed
* by another process.
*
* @param mixed $link Database link
* @param integer $limit Maximum number of feeds in update batch. Default to DAEMON_FEED_LIMIT.
* @param boolean $from_http Set to true if you call this function from http to disable cli specific code.
* @param boolean $debug Set to false to disable debug output. Default to true.
* @return void
*/
function update_daemon_common($link, $limit = DAEMON_FEED_LIMIT, $from_http = false, $debug = true) {
// Process all other feeds using last_updated and interval parameters
// Test if the user has loggued in recently. If not, it does not update its feeds.
if (DAEMON_UPDATE_LOGIN_LIMIT > 0) {
if (DB_TYPE == "pgsql") {
$login_thresh_qpart = "AND ttrss_users.last_login >= NOW() - INTERVAL '".DAEMON_UPDATE_LOGIN_LIMIT." days'";
} else {
$login_thresh_qpart = "AND ttrss_users.last_login >= DATE_SUB(NOW(), INTERVAL ".DAEMON_UPDATE_LOGIN_LIMIT." DAY)";
}
} else {
$login_thresh_qpart = "";
}
// Test if the feed need a update (update interval exceded).
if (DB_TYPE == "pgsql") {
$update_limit_qpart = "AND ((
ttrss_feeds.update_interval = 0
AND ttrss_feeds.last_updated < NOW() - CAST((ttrss_user_prefs.value || ' minutes') AS INTERVAL)
) OR (
ttrss_feeds.update_interval > 0
AND ttrss_feeds.last_updated < NOW() - CAST((ttrss_feeds.update_interval || ' minutes') AS INTERVAL)
))";
} else {
$update_limit_qpart = "AND ((
ttrss_feeds.update_interval = 0
AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL CONVERT(ttrss_user_prefs.value, SIGNED INTEGER) MINUTE)
) OR (
ttrss_feeds.update_interval > 0
AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL ttrss_feeds.update_interval MINUTE)
))";
}
// Test if feed is currently being updated by another process.
if (DB_TYPE == "pgsql") {
$updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < NOW() - INTERVAL '120 seconds')";
} else {
$updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < DATE_SUB(NOW(), INTERVAL 120 SECOND))";
}
// Test if there is a limit to number of updated feeds
$query_limit = "";
if($limit) $query_limit = sprintf("LIMIT %d", $limit);
// We search for feed needing update.
$result = db_query($link, "SELECT ttrss_feeds.feed_url,ttrss_feeds.id, ttrss_feeds.owner_uid,
SUBSTRING(ttrss_feeds.last_updated,1,19) AS last_updated,
ttrss_feeds.update_interval
FROM
ttrss_feeds, ttrss_users, ttrss_user_prefs
WHERE
ttrss_feeds.owner_uid = ttrss_users.id
AND ttrss_users.id = ttrss_user_prefs.owner_uid
AND ttrss_user_prefs.pref_name = 'DEFAULT_UPDATE_INTERVAL'
$login_thresh_qpart $update_limit_qpart
$updstart_thresh_qpart
ORDER BY ttrss_feeds.last_updated ASC $query_limit");
$user_prefs_cache = array();
if($debug) _debug(sprintf("Scheduled %d feeds to update...\n", db_num_rows($result)));
// Here is a little cache magic in order to minimize risk of double feed updates.
$feeds_to_update = array();
while ($line = db_fetch_assoc($result)) {
$feeds_to_update[$line['id']] = $line;
}
// We update the feed last update started date before anything else.
// There is no lag due to feed contents downloads
// It prevent an other process to update the same feed.
$feed_ids = array_keys($feeds_to_update);
if($feed_ids) {
db_query($link, sprintf("UPDATE ttrss_feeds SET last_update_started = NOW()
WHERE id IN (%s)", implode(',', $feed_ids)));
}
// For each feed, we call the feed update function.
while ($line = array_pop($feeds_to_update)) {
if($debug) _debug("Feed: " . $line["feed_url"] . ", " . $line["last_updated"]);
// We setup a alarm to alert if the feed take more than 300s to update.
// => HANG alarm.
if(!$from_http) pcntl_alarm(300);
update_rss_feed($link, $line["feed_url"], $line["id"], true);
// Cancel the alarm (the update went well)
if(!$from_http) pcntl_alarm(0);
sleep(1); // prevent flood (FIXME make this an option?)
}
// Send feed digests by email if needed.
if (DAEMON_SENDS_DIGESTS) send_headlines_digests($link);
} // function update_daemon_common
?>

88
update_daemon2.php
View file

@ -88,6 +88,7 @@
if (!pcntl_fork()) {
pcntl_signal(SIGINT, 'sigint_handler');
// Try to lock a file in order to avoid concurrent update.
$lock_handle = make_lockfile("update_daemon.lock");
if (!$lock_handle) {
@ -115,6 +116,8 @@
while (true) {
// Since sleep is interupted by SIGCHLD, we need another way to
// respect the SPAWN_INTERVAL
$next_spawn = $last_checkpoint + SPAWN_INTERVAL - time();
if ($next_spawn % 10 == 0) {
@ -180,89 +183,8 @@
// $last_purge = time();
// }
// Process all other feeds using last_updated and interval parameters
$random_qpart = sql_random_function();
if (DAEMON_UPDATE_LOGIN_LIMIT > 0) {
if (DB_TYPE == "pgsql") {
$login_thresh_qpart = "AND ttrss_users.last_login >= NOW() - INTERVAL '".DAEMON_UPDATE_LOGIN_LIMIT." days'";
} else {
$login_thresh_qpart = "AND ttrss_users.last_login >= DATE_SUB(NOW(), INTERVAL ".DAEMON_UPDATE_LOGIN_LIMIT." DAY)";
}
} else {
$login_thresh_qpart = "";
}
if (DB_TYPE == "pgsql") {
$update_limit_qpart = "AND ((
ttrss_feeds.update_interval = 0
AND ttrss_feeds.last_updated < NOW() - CAST((ttrss_user_prefs.value || ' minutes') AS INTERVAL)
) OR (
ttrss_feeds.update_interval > 0
AND ttrss_feeds.last_updated < NOW() - CAST((ttrss_feeds.update_interval || ' minutes') AS INTERVAL)
))";
} else {
$update_limit_qpart = "AND ((
ttrss_feeds.update_interval = 0
AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL CONVERT(ttrss_user_prefs.value, SIGNED INTEGER) MINUTE)
) OR (
ttrss_feeds.update_interval > 0
AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL ttrss_feeds.update_interval MINUTE)
))";
}
if (DB_TYPE == "pgsql") {
$updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < NOW() - INTERVAL '120 seconds')";
} else {
$updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < DATE_SUB(NOW(), INTERVAL 120 SECOND))";
}
$result = db_query($link, "SELECT ttrss_feeds.feed_url,ttrss_feeds.id, ttrss_feeds.owner_uid,
SUBSTRING(ttrss_feeds.last_updated,1,19) AS last_updated,
ttrss_feeds.update_interval
FROM
ttrss_feeds, ttrss_users, ttrss_user_prefs
WHERE
ttrss_feeds.owner_uid = ttrss_users.id
AND ttrss_users.id = ttrss_user_prefs.owner_uid
AND ttrss_user_prefs.pref_name = 'DEFAULT_UPDATE_INTERVAL'
$login_thresh_qpart $update_limit_qpart
$updstart_thresh_qpart
ORDER BY $random_qpart DESC LIMIT " . DAEMON_FEED_LIMIT);
$user_prefs_cache = array();
_debug(sprintf("Scheduled %d feeds to update...\n", db_num_rows($result)));
// Here is a little cache magic in order to minimize risk of double feed updates.
$feeds_to_update = array();
while ($line = db_fetch_assoc($result)) {
$feeds_to_update[$line['id']] = $line;
}
// We update the feed last update started date before anything else.
// There is no lag due to feed contents downloads
// It prevent an other process to update the same feed.
$feed_ids = array_keys($feeds_to_update);
if($feed_ids) {
db_query($link, sprintf("UPDATE ttrss_feeds SET last_update_started = NOW()
WHERE id IN (%s)", implode(',', $feed_ids)));
}
while ($line = array_pop($feeds_to_update)) {
_debug("Feed: " . $line["feed_url"] . ", " . $line["last_updated"]);
pcntl_alarm(300);
update_rss_feed($link, $line["feed_url"], $line["id"], true);
pcntl_alarm(0);
sleep(1); // prevent flood (FIXME make this an option?)
}
if (DAEMON_SENDS_DIGESTS) send_headlines_digests($link);
// Call to the feed batch update function
update_daemon_common($link);
_debug("Elapsed time: " . (time() - $start_timestamp) . " second(s)");

82
update_daemon_loop.php
View file

@ -88,7 +88,7 @@
// Process all other feeds using last_updated and interval parameters
$random_qpart = sql_random_function();
// $random_qpart = sql_random_function();
/*
ttrss_entries.date_entered < NOW() - INTERVAL '$purge_interval days'");
@ -105,84 +105,8 @@
feed_id = '$feed_id' AND
ttrss_entries.date_entered < DATE_SUB(NOW(), INTERVAL $purge_interval DAY)"); */
if (DAEMON_UPDATE_LOGIN_LIMIT > 0) {
if (DB_TYPE == "pgsql") {
$login_thresh_qpart = "AND ttrss_users.last_login >= NOW() - INTERVAL '".DAEMON_UPDATE_LOGIN_LIMIT." days'";
} else {
$login_thresh_qpart = "AND ttrss_users.last_login >= DATE_SUB(NOW(), INTERVAL ".DAEMON_UPDATE_LOGIN_LIMIT." DAY)";
}
} else {
$login_thresh_qpart = "";
}
if (DB_TYPE == "pgsql") {
$update_limit_qpart = "AND ((
ttrss_feeds.update_interval = 0
AND ttrss_feeds.last_updated < NOW() - CAST((ttrss_user_prefs.value || ' minutes') AS INTERVAL)
) OR (
ttrss_feeds.update_interval > 0
AND ttrss_feeds.last_updated < NOW() - CAST((ttrss_feeds.update_interval || ' minutes') AS INTERVAL)
))";
} else {
$update_limit_qpart = "AND ((
ttrss_feeds.update_interval = 0
AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL CONVERT(ttrss_user_prefs.value, SIGNED INTEGER) MINUTE)
) OR (
ttrss_feeds.update_interval > 0
AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL ttrss_feeds.update_interval MINUTE)
))";
}
if (DB_TYPE == "pgsql") {
$updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < NOW() - INTERVAL '120 seconds')";
} else {
$updstart_thresh_qpart = "AND (ttrss_feeds.last_update_started IS NULL OR ttrss_feeds.last_update_started < DATE_SUB(NOW(), INTERVAL 120 SECOND))";
}
$result = db_query($link, "SELECT ttrss_feeds.feed_url,ttrss_feeds.id, ttrss_feeds.owner_uid,
SUBSTRING(ttrss_feeds.last_updated,1,19) AS last_updated,
ttrss_feeds.update_interval
FROM
ttrss_feeds, ttrss_users, ttrss_user_prefs
WHERE
ttrss_feeds.owner_uid = ttrss_users.id
AND ttrss_users.id = ttrss_user_prefs.owner_uid
AND ttrss_user_prefs.pref_name='DEFAULT_UPDATE_INTERVAL'
$login_thresh_qpart $update_limit_qpart
$updstart_thresh_qpart
ORDER BY $random_qpart DESC LIMIT " . DAEMON_FEED_LIMIT);
$user_prefs_cache = array();
_debug(sprintf("Scheduled %d feeds to update...\n", db_num_rows($result)));
// Here is a little cache magic in order to minimize risk of double feed updates.
$feeds_to_update = array();
while ($line = db_fetch_assoc($result)) {
$feeds_to_update[$line['id']] = $line;
}
// We update the feed last update started date before anything else.
// There is no lag due to feed contents downloads
// It prevent an other process to update the same feed (for exemple, forced update by user).
$feed_ids = array_keys($feeds_to_update);
if($feed_ids) {
db_query($link, sprintf("UPDATE ttrss_feeds SET last_update_started = NOW()
WHERE id IN (%s)", implode(',', $feed_ids)));
}
while ($line = array_pop($feeds_to_update)) {
_debug("Feed: " . $line["feed_url"] . ", " . $line["last_updated"]);
pcntl_alarm(300);
update_rss_feed($link, $line["feed_url"], $line["id"], true);
pcntl_alarm(0);
sleep(1); // prevent flood (FIXME make this an option?)
}
if (DAEMON_SENDS_DIGESTS) send_headlines_digests($link);
// Call to the feed batch update function
update_daemon_common($link);
db_close($link);

12
update_feeds.php
View file

@ -19,11 +19,13 @@
$lock_handle = make_lockfile($lock_filename);
// Try to lock a file in order to avoid concurrent update.
if (!$lock_handle) {
die("error: Can't create lockfile ($lock_filename). ".
"Maybe another process is already running.\n");
}
// Create a database connection.
$link = db_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
if (!$link) {
@ -44,14 +46,10 @@
}
}
$result = db_query($link, "SELECT id FROM ttrss_users");
while ($line = db_fetch_assoc($result)) {
$user_id = $line["id"];
initialize_user_prefs($link, $user_id);
update_all_feeds($link, false, $user_id, true);
}
// Update all feeds needing a update.
update_daemon_common($link, $limit=0);
// Send feed digests by email if needed.
if (DAEMON_SENDS_DIGESTS) send_headlines_digests($link);
db_close($link);