DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (b6057e17f856)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsPlacesTables.h"

#ifndef __nsPlacesTriggers_h__
#define __nsPlacesTriggers_h__

/**
 * Exclude these visit types:
 *  0 - invalid
 *  4 - EMBED
 *  7 - DOWNLOAD
 *  7 - FRAMED_LINK
 **/
#define EXCLUDED_VISIT_TYPES "0, 4, 7, 8"

/**
 * This triggers update visit_count and last_visit_date based on historyvisits
 * table changes.
 */
#define CREATE_HISTORYVISITS_AFTERINSERT_TRIGGER NS_LITERAL_CSTRING( \
  "CREATE TEMP TRIGGER moz_historyvisits_afterinsert_v2_trigger " \
  "AFTER INSERT ON moz_historyvisits FOR EACH ROW " \
  "BEGIN " \
    "UPDATE moz_places SET " \
      "visit_count = visit_count + (SELECT NEW.visit_type NOT IN (" EXCLUDED_VISIT_TYPES ")), "\
      "last_visit_date = MAX(IFNULL(last_visit_date, 0), NEW.visit_date) " \
    "WHERE id = NEW.place_id;" \
  "END" \
)

#define CREATE_HISTORYVISITS_AFTERDELETE_TRIGGER NS_LITERAL_CSTRING( \
  "CREATE TEMP TRIGGER moz_historyvisits_afterdelete_v2_trigger " \
  "AFTER DELETE ON moz_historyvisits FOR EACH ROW " \
  "BEGIN " \
    "UPDATE moz_places SET " \
      "visit_count = visit_count - (SELECT OLD.visit_type NOT IN (" EXCLUDED_VISIT_TYPES ")), "\
      "last_visit_date = (SELECT visit_date FROM moz_historyvisits " \
                         "WHERE place_id = OLD.place_id " \
                         "ORDER BY visit_date DESC LIMIT 1) " \
    "WHERE id = OLD.place_id;" \
  "END" \
)

/**
 * A predicate matching pages on rev_host, based on a given host value.
 * 'host' may be either the moz_hosts.host column or an alias representing an
 * equivalent value.
 */
#define HOST_TO_REVHOST_PREDICATE \
  "rev_host = get_unreversed_host(host || '.') || '.' " \
  "OR rev_host = get_unreversed_host(host || '.') || '.www.'"

/**
 * Select the best prefix for a host, based on existing pages registered for it.
 * Prefixes have a priority, from the top to the bottom, so that secure pages
 * have higher priority, and more generically "www." prefixed hosts come before
 * unprefixed ones.
 * Given a host, examine associated pages and:
 *  - if all of the typed pages start with https://www. return https://www.
 *  - if all of the typed pages start with https:// return https://
 *  - if all of the typed pages start with ftp: return ftp://
 *  - if all of the typed pages start with www. return www.
 *  - otherwise don't use any prefix
 */
#define HOSTS_PREFIX_PRIORITY_FRAGMENT \
  "SELECT CASE " \
    "WHEN 1 = ( " \
      "SELECT min(substr(url,1,12) = 'https://www.') FROM moz_places h " \
      "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \
    ") THEN 'https://www.' " \
    "WHEN 1 = ( " \
      "SELECT min(substr(url,1,8) = 'https://') FROM moz_places h " \
      "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \
    ") THEN 'https://' " \
    "WHEN 1 = ( " \
      "SELECT min(substr(url,1,4) = 'ftp:') FROM moz_places h " \
      "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \
    ") THEN 'ftp://' " \
    "WHEN 1 = ( " \
      "SELECT min(substr(url,1,11) = 'http://www.') FROM moz_places h " \
      "WHERE (" HOST_TO_REVHOST_PREDICATE ") AND +h.typed = 1 " \
    ") THEN 'www.' " \
  "END "

/**
 * These triggers update the hostnames table whenever moz_places changes.
 */
#define CREATE_PLACES_AFTERINSERT_TRIGGER NS_LITERAL_CSTRING( \
  "CREATE TEMP TRIGGER moz_places_afterinsert_trigger " \
  "AFTER INSERT ON moz_places FOR EACH ROW " \
  "WHEN LENGTH(NEW.rev_host) > 1 " \
  "BEGIN " \
    "INSERT OR REPLACE INTO moz_hosts (id, host, frecency, typed, prefix) " \
    "VALUES (" \
      "(SELECT id FROM moz_hosts WHERE host = fixup_url(get_unreversed_host(NEW.rev_host))), " \
      "fixup_url(get_unreversed_host(NEW.rev_host)), " \
      "MAX(IFNULL((SELECT frecency FROM moz_hosts WHERE host = fixup_url(get_unreversed_host(NEW.rev_host))), -1), NEW.frecency), " \
      "MAX(IFNULL((SELECT typed FROM moz_hosts WHERE host = fixup_url(get_unreversed_host(NEW.rev_host))), 0), NEW.typed), " \
      "(" HOSTS_PREFIX_PRIORITY_FRAGMENT \
       "FROM ( " \
          "SELECT fixup_url(get_unreversed_host(NEW.rev_host)) AS host " \
        ") AS match " \
      ") " \
    "); " \
  "END" \
)

#define CREATE_PLACES_AFTERDELETE_TRIGGER NS_LITERAL_CSTRING( \
  "CREATE TEMP TRIGGER moz_places_afterdelete_trigger " \
  "AFTER DELETE ON moz_places FOR EACH ROW " \
  "BEGIN " \
    "DELETE FROM moz_hosts " \
    "WHERE host = fixup_url(get_unreversed_host(OLD.rev_host)) " \
      "AND NOT EXISTS(" \
        "SELECT 1 FROM moz_places " \
          "WHERE rev_host = get_unreversed_host(host || '.') || '.' " \
             "OR rev_host = get_unreversed_host(host || '.') || '.www.' " \
      "); " \
    "UPDATE moz_hosts " \
    "SET prefix = (" HOSTS_PREFIX_PRIORITY_FRAGMENT ") " \
    "WHERE host = fixup_url(get_unreversed_host(OLD.rev_host)); " \
  "END" \
)

// For performance reasons the host frecency is updated only when the page
// frecency changes by a meaningful percentage.  This is because the frecency
// decay algorithm requires to update all the frecencies at once, causing a
// too high overhead, while leaving the ordering unchanged.
#define CREATE_PLACES_AFTERUPDATE_FRECENCY_TRIGGER NS_LITERAL_CSTRING( \
  "CREATE TEMP TRIGGER moz_places_afterupdate_frecency_trigger " \
  "AFTER UPDATE OF frecency ON moz_places FOR EACH ROW " \
  "WHEN NEW.frecency >= 0 " \
    "AND ABS(" \
      "IFNULL((NEW.frecency - OLD.frecency) / CAST(NEW.frecency AS REAL), " \
             "(NEW.frecency - OLD.frecency))" \
    ") > .05 " \
  "BEGIN " \
    "UPDATE moz_hosts " \
    "SET frecency = (SELECT MAX(frecency) FROM moz_places " \
                    "WHERE rev_host = get_unreversed_host(host || '.') || '.' " \
                       "OR rev_host = get_unreversed_host(host || '.') || '.www.') " \
    "WHERE host = fixup_url(get_unreversed_host(NEW.rev_host)); " \
  "END" \
)

#define CREATE_PLACES_AFTERUPDATE_TYPED_TRIGGER NS_LITERAL_CSTRING( \
  "CREATE TEMP TRIGGER moz_places_afterupdate_typed_trigger " \
  "AFTER UPDATE OF typed ON moz_places FOR EACH ROW " \
  "WHEN NEW.typed = 1 " \
  "BEGIN " \
    "UPDATE moz_hosts " \
    "SET typed = 1 " \
    "WHERE host = fixup_url(get_unreversed_host(NEW.rev_host)); " \
  "END" \
)

/**
 * This trigger removes a row from moz_openpages_temp when open_count reaches 0.
 *
 * @note this should be kept up-to-date with the definition in
 *       nsPlacesAutoComplete.js
 */
#define CREATE_REMOVEOPENPAGE_CLEANUP_TRIGGER NS_LITERAL_CSTRING( \
  "CREATE TEMPORARY TRIGGER moz_openpages_temp_afterupdate_trigger " \
  "AFTER UPDATE OF open_count ON moz_openpages_temp FOR EACH ROW " \
  "WHEN NEW.open_count = 0 " \
  "BEGIN " \
    "DELETE FROM moz_openpages_temp " \
    "WHERE url = NEW.url;" \
  "END" \
)

#endif // __nsPlacesTriggers_h__