gecko-dev/toolkit/components/places/History.jsm
David Rajchenbach-Teller 38a8ed9399 Bug 1043863 - Use AsyncShutdown to shutdown Places. r=mak
--HG--
extra : rebase_source : 3a593651ac1fc995e01d00af037aaac8b81c7c32
2015-05-05 12:44:16 +02:00

766 lines
25 KiB
JavaScript

/* 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/. */
"use strict";
/**
* Asynchronous API for managing history.
*
*
* The API makes use of `PageInfo` and `VisitInfo` objects, defined as follows.
*
* A `PageInfo` object is any object that contains A SUBSET of the
* following properties:
* - guid: (string)
* The globally unique id of the page.
* - url: (URL)
* or (nsIURI)
* or (string)
* The full URI of the page. Note that `PageInfo` values passed as
* argument may hold `nsIURI` or `string` values for property `url`,
* but `PageInfo` objects returned by this module always hold `URL`
* values.
* - title: (string)
* The title associated with the page, if any.
* - frecency: (number)
* The frecency of the page, if any.
* See https://developer.mozilla.org/en-US/docs/Mozilla/Tech/Places/Frecency_algorithm
* Note that this property may not be used to change the actualy frecency
* score of a page, only to retrieve it. In other words, any `frecency` field
* passed as argument to a function of this API will be ignored.
* - visits: (Array<VisitInfo>)
* All the visits for this page, if any.
*
* See the documentation of individual methods to find out which properties
* are required for `PageInfo` arguments or returned for `PageInfo` results.
*
* A `VisitInfo` object is any object that contains A SUBSET of the following
* properties:
* - date: (Date)
* The time the visit occurred.
* - transition: (number)
* How the user reached the page. See constants `TRANSITION_*`
* for the possible transition types.
* - referrer: (URL)
* or (nsIURI)
* or (string)
* The referring URI of this visit. Note that `VisitInfo` passed
* as argument may hold `nsIURI` or `string` values for property `referrer`,
* but `VisitInfo` objects returned by this module always hold `URL`
* values.
* See the documentation of individual methods to find out which properties
* are required for `VisitInfo` arguments or returned for `VisitInfo` results.
*
*
*
* Each successful operation notifies through the nsINavHistoryObserver
* interface. To listen to such notifications you must register using
* nsINavHistoryService `addObserver` and `removeObserver` methods.
* @see nsINavHistoryObserver
*/
this.EXPORTED_SYMBOLS = [ "History" ];
const { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "AsyncShutdown",
"resource://gre/modules/AsyncShutdown.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Services",
"resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
"resource://gre/modules/NetUtil.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Promise",
"resource://gre/modules/Promise.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Task",
"resource://gre/modules/Task.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "Sqlite",
"resource://gre/modules/Sqlite.jsm");
XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
"resource://gre/modules/PlacesUtils.jsm");
Cu.importGlobalProperties(["URL"]);
/**
* Whenever we update or remove numerous pages, it is preferable
* to yield time to the main thread every so often to avoid janking.
* These constants determine the maximal number of notifications we
* may emit before we yield.
*/
const NOTIFICATION_CHUNK_SIZE = 300;
const ONRESULT_CHUNK_SIZE = 300;
/**
* Sends a bookmarks notification through the given observers.
*
* @param observers
* array of nsINavBookmarkObserver objects.
* @param notification
* the notification name.
* @param args
* array of arguments to pass to the notification.
*/
function notify(observers, notification, args = []) {
for (let observer of observers) {
try {
observer[notification](...args);
} catch (ex) {}
}
}
this.History = Object.freeze({
/**
* Fetch the available information for one page.
*
* @param guidOrURI: (URL or nsIURI)
* The full URI of the page.
* or (string)
* Either the full URI of the page or the GUID of the page.
*
* @return (Promise)
* A promise resolved once the operation is complete.
* @resolves (PageInfo | null) If the page could be found, the information
* on that page. Note that this `PageInfo` does NOT contain the visit
* data (i.e. `visits` is `undefined`).
*
* @throws (Error)
* If `guidOrURI` does not have the expected type or if it is a string
* that may be parsed neither as a valid URL nor as a valid GUID.
*/
fetch: function (guidOrURI) {
throw new Error("Method not implemented");
},
/**
* Adds a set of visits for one or more page.
*
* Any change may be observed through nsINavHistoryObserver
*
* @note This function recomputes the frecency of the page automatically,
* regardless of the value of property `frecency` passed as argument.
* @note If there is no entry for the page, the entry is created.
*
* @param infos: (PageInfo)
* Information on a page. This `PageInfo` MUST contain
* - either a property `guid` or a property `url`, as specified
* by the definition of `PageInfo`;
* - a property `visits`, as specified by the definition of
* `PageInfo`, which MUST contain at least one visit.
* If a property `title` is provided, the title of the page
* is updated.
* If the `visitDate` of a visit is not provided, it defaults
* to now.
* or (Array<PageInfo>)
* An array of the above, to batch requests.
* @param onResult: (function(PageInfo), [optional])
* A callback invoked for each page, with the updated
* information on that page. Note that this `PageInfo`
* does NOT contain the visit data (i.e. `visits` is
* `undefined`).
*
* @return (Promise)
* A promise resolved once the operation is complete, including
* all calls to `onResult`.
* @resolves (bool)
* `true` if at least one page entry was created, `false` otherwise
* (i.e. if page entries were updated but not created).
*
* @throws (Error)
* If the `url` specified was for a protocol that should not be
* stored (e.g. "chrome:", "mailbox:", "about:", "imap:", "news:",
* "moz-anno:", "view-source:", "resource:", "data:", "wyciwyg:",
* "javascript:", "blob:").
* @throws (Error)
* If `infos` has an unexpected type.
* @throws (Error)
* If a `PageInfo` has neither `guid` nor `url`.
* @throws (Error)
* If a `guid` property provided is not a valid GUID.
* @throws (Error)
* If a `PageInfo` does not have a `visits` property or if the
* value of `visits` is ill-typed or is an empty array.
* @throws (Error)
* If an element of `visits` has an invalid `date`.
* @throws (Error)
* If an element of `visits` is missing `transition` or if
* the value of `transition` is invalid.
*/
update: function (infos, onResult) {
throw new Error("Method not implemented");
},
/**
* Remove pages from the database.
*
* Any change may be observed through nsINavHistoryObserver
*
*
* @param page: (URL or nsIURI)
* The full URI of the page.
* or (string)
* Either the full URI of the page or the GUID of the page.
* or (Array<URL|nsIURI|string>)
* An array of the above, to batch requests.
* @param onResult: (function(PageInfo))
* A callback invoked for each page found.
*
* @return (Promise)
* A promise resolved once the operation is complete.
* @resolve (bool)
* `true` if at least one page was removed, `false` otherwise.
* @throws (TypeError)
* If `pages` has an unexpected type or if a string provided
* is neither a valid GUID nor a valid URI or if `pages`
* is an empty array.
*/
remove: function (pages, onResult = null) {
// Normalize and type-check arguments
if (Array.isArray(pages)) {
if (pages.length == 0) {
throw new TypeError("Expected at least one page");
}
} else {
pages = [pages];
}
let guids = [];
let urls = [];
for (let page of pages) {
// Normalize to URL or GUID, or throw if `page` cannot
// be normalized.
let normalized = normalizeToURLOrGUID(page);
if (typeof normalized === "string") {
guids.push(normalized);
} else {
urls.push(normalized.href);
}
}
let normalizedPages = {guids: guids, urls: urls};
// At this stage, we know that either `guids` is not-empty
// or `urls` is not-empty.
if (onResult && typeof onResult != "function") {
throw new TypeError("Invalid function: " + onResult);
}
return PlacesUtils.withConnectionWrapper("History.jsm: remove",
db => remove(db, normalizedPages, onResult));
},
/**
* Remove visits matching specific characteristics.
*
* Any change may be observed through nsINavHistoryObserver.
*
* @param filter: (object)
* The `object` may contain some of the following
* properties:
* - beginDate: (Date) Remove visits that have
* been added since this date (inclusive).
* - endDate: (Date) Remove visits that have
* been added before this date (inclusive).
* If both `beginDate` and `endDate` are specified,
* visits between `beginDate` (inclusive) and `end`
* (inclusive) are removed.
*
* @param onResult: (function(VisitInfo), [optional])
* A callback invoked for each visit found and removed.
* Note that the referrer property of `VisitInfo`
* is NOT populated.
*
* @return (Promise)
* @resolve (bool)
* `true` if at least one visit was removed, `false`
* otherwise.
* @throws (TypeError)
* If `filter` does not have the expected type, in
* particular if the `object` is empty.
*/
removeVisitsByFilter: function(filter, onResult = null) {
if (!filter || typeof filter != "object") {
throw new TypeError("Expected a filter");
}
let hasBeginDate = "beginDate" in filter;
let hasEndDate = "endDate" in filter;
if (hasBeginDate) {
ensureDate(filter.beginDate);
}
if (hasEndDate) {
ensureDate(filter.endDate);
}
if (hasBeginDate && hasEndDate && filter.beginDate > filter.endDate) {
throw new TypeError("`beginDate` should be at least as old as `endDate`");
}
if (!hasBeginDate && !hasEndDate) {
throw new TypeError("Expected a non-empty filter");
}
if (onResult && typeof onResult != "function") {
throw new TypeError("Invalid function: " + onResult);
}
return PlacesUtils.withConnectionWrapper("History.jsm: removeVisitsByFilter",
db => removeVisitsByFilter(db, filter, onResult)
);
},
/**
* Determine if a page has been visited.
*
* @param pages: (URL or nsIURI)
* The full URI of the page.
* or (string)
* The full URI of the page or the GUID of the page.
*
* @return (Promise)
* A promise resolved once the operation is complete.
* @resolve (bool)
* `true` if the page has been visited, `false` otherwise.
* @throws (Error)
* If `pages` has an unexpected type or if a string provided
* is neither not a valid GUID nor a valid URI.
*/
hasVisits: function(page, onResult) {
throw new Error("Method not implemented");
},
/**
* Clear all history.
*
* @return (Promise)
* A promise resolved once the operation is complete.
*/
clear() {
return PlacesUtils.withConnectionWrapper("History.jsm: clear",
clear
);
},
/**
* Possible values for the `transition` property of `VisitInfo`
* objects.
*/
/**
* The user followed a link and got a new toplevel window.
*/
TRANSITION_LINK: Ci.nsINavHistoryService.TRANSITION_LINK,
/**
* The user typed the page's URL in the URL bar or selected it from
* URL bar autocomplete results, clicked on it from a history query
* (from the History sidebar, History menu, or history query in the
* personal toolbar or Places organizer.
*/
TRANSITION_TYPED: Ci.nsINavHistoryService.TRANSITION_TYPED,
/**
* The user followed a bookmark to get to the page.
*/
TRANSITION_BOOKMARK: Ci.nsINavHistoryService.TRANSITION_BOOKMARK,
/**
* Some inner content is loaded. This is true of all images on a
* page, and the contents of the iframe. It is also true of any
* content in a frame if the user did not explicitly follow a link
* to get there.
*/
TRANSITION_EMBED: Ci.nsINavHistoryService.TRANSITION_EMBED,
/**
* Set when the transition was a permanent redirect.
*/
TRANSITION_REDIRECT_PERMANENT: Ci.nsINavHistoryService.TRANSITION_REDIRECT_PERMANENT,
/**
* Set when the transition was a temporary redirect.
*/
TRANSITION_REDIRECT_TEMPORARY: Ci.nsINavHistoryService.TRANSITION_REDIRECT_TEMPORARY,
/**
* Set when the transition is a download.
*/
TRANSITION_DOWNLOAD: Ci.nsINavHistoryService.TRANSITION_REDIRECT_DOWNLOAD,
/**
* The user followed a link and got a visit in a frame.
*/
TRANSITION_FRAMED_LINK: Ci.nsINavHistoryService.TRANSITION_FRAMED_LINK,
});
/**
* Normalize a key to either a string (if it is a valid GUID) or an
* instance of `URL` (if it is a `URL`, `nsIURI`, or a string
* representing a valid url).
*
* @throws (TypeError)
* If the key is neither a valid guid nor a valid url.
*/
function normalizeToURLOrGUID(key) {
if (typeof key === "string") {
// A string may be a URL or a guid
if (/^[a-zA-Z0-9\-_]{12}$/.test(key)) {
return key;
}
return new URL(key);
}
if (key instanceof URL) {
return key;
}
if (key instanceof Ci.nsIURI) {
return new URL(key.spec);
}
throw new TypeError("Invalid url or guid: " + key);
}
/**
* Throw if an object is not a Date object.
*/
function ensureDate(arg) {
if (!arg || typeof arg != "object" || arg.constructor.name != "Date") {
throw new TypeError("Expected a Date, got " + arg);
}
}
/**
* Convert a list of strings or numbers to its SQL
* representation as a string.
*/
function sqlList(list) {
return list.map(JSON.stringify).join();
}
/**
* Invalidate and recompute the frecency of a list of pages,
* informing frecency observers.
*
* @param db: (Sqlite connection)
* @param idList: (Array)
* The `moz_places` identifiers for the places to invalidate.
* @return (Promise)
*/
let invalidateFrecencies = Task.async(function*(db, idList) {
if (idList.length == 0) {
return;
}
let ids = sqlList(idList);
yield db.execute(
`UPDATE moz_places
SET frecency = NOTIFY_FRECENCY(
CALCULATE_FRECENCY(id), url, guid, hidden, last_visit_date
) WHERE id in (${ ids })`
);
yield db.execute(
`UPDATE moz_places
SET hidden = 0
WHERE id in (${ ids })
AND frecency <> 0`
);
});
// Inner implementation of History.clear().
let clear = Task.async(function* (db) {
// Remove all history.
yield db.execute("DELETE FROM moz_historyvisits");
// Clear the registered embed visits.
PlacesUtils.history.clearEmbedVisits();
// Expiration will take care of orphans.
let observers = PlacesUtils.history.getObservers();
notify(observers, "onClearHistory");
// Invalidate frecencies for the remaining places. This must happen
// after the notification to ensure it runs enqueued to expiration.
yield db.execute(
`UPDATE moz_places SET frecency =
(CASE
WHEN url BETWEEN 'place:' AND 'place;'
THEN 0
ELSE -1
END)
WHERE frecency > 0`);
// Notify frecency change observers.
notify(observers, "onManyFrecenciesChanged");
});
/**
* Remove a list of pages from `moz_places` by their id.
*
* @param db: (Sqlite connection)
* The database.
* @param idList: (Array of integers)
* The `moz_places` identifiers for the places to remove.
* @return (Promise)
*/
let removePagesById = Task.async(function*(db, idList) {
if (idList.length == 0) {
return;
}
yield db.execute(`DELETE FROM moz_places
WHERE id IN ( ${ sqlList(idList) } )`);
});
/**
* Clean up pages whose history has been modified, by either
* removing them entirely (if they are marked for removal,
* typically because all visits have been removed and there
* are no more foreign keys such as bookmarks) or updating
* their frecency (otherwise).
*
* @param db: (Sqlite connection)
* The database.
* @param pages: (Array of objects)
* Pages that have been touched and that need cleaning up.
* Each object should have the following properties:
* - id: (number) The `moz_places` identifier for the place.
* - hasVisits: (boolean) If `true`, there remains at least one
* visit to this page, so the page should be kept and its
* frecency updated.
* - hasForeign: (boolean) If `true`, the page has at least
* one foreign reference (i.e. a bookmark), so the page should
* be kept and its frecency updated.
* @return (Promise)
*/
let cleanupPages = Task.async(function*(db, pages) {
yield invalidateFrecencies(db, [p.id for (p of pages) if (p.hasForeign || p.hasVisits)]);
yield removePagesById(db, [p.id for (p of pages) if (!p.hasForeign && !p.hasVisits)]);
});
/**
* Notify observers that pages have been removed/updated.
*
* @param db: (Sqlite connection)
* The database.
* @param pages: (Array of objects)
* Pages that have been touched and that need cleaning up.
* Each object should have the following properties:
* - id: (number) The `moz_places` identifier for the place.
* - hasVisits: (boolean) If `true`, there remains at least one
* visit to this page, so the page should be kept and its
* frecency updated.
* - hasForeign: (boolean) If `true`, the page has at least
* one foreign reference (i.e. a bookmark), so the page should
* be kept and its frecency updated.
* @return (Promise)
*/
let notifyCleanup = Task.async(function*(db, pages) {
let notifiedCount = 0;
let observers = PlacesUtils.history.getObservers();
let reason = Ci.nsINavHistoryObserver.REASON_DELETED;
for (let page of pages) {
let uri = NetUtil.newURI(page.url.href);
let guid = page.guid;
if (page.hasVisits) {
// For the moment, we do not have the necessary observer API
// to notify when we remove a subset of visits, see bug 937560.
continue;
}
if (page.hasForeign) {
// We have removed all visits, but the page is still alive, e.g.
// because of a bookmark.
notify(observers, "onDeleteVisits",
[uri, /*last visit*/0, guid, reason, -1]);
} else {
// The page has been entirely removed.
notify(observers, "onDeleteURI",
[uri, guid, reason]);
}
if (++notifiedCount % NOTIFICATION_CHUNK_SIZE == 0) {
// Every few notifications, yield time back to the main
// thread to avoid jank.
yield Promise.resolve();
}
}
});
/**
* Notify an `onResult` callback of a set of operations
* that just took place.
*
* @param data: (Array)
* The data to send to the callback.
* @param onResult: (function [optional])
* If provided, call `onResult` with `data[0]`, `data[1]`, etc.
* Otherwise, do nothing.
*/
let notifyOnResult = Task.async(function*(data, onResult) {
if (!onResult) {
return;
}
let notifiedCount = 0;
for (let info of data) {
try {
onResult(info);
} catch (ex) {
// Errors should be reported but should not stop the operation.
Promise.reject(ex);
}
if (++notifiedCount % ONRESULT_CHUNK_SIZE == 0) {
// Every few notifications, yield time back to the main
// thread to avoid jank.
yield Promise.resolve();
}
}
});
// Inner implementation of History.removeVisitsByFilter.
let removeVisitsByFilter = Task.async(function*(db, filter, onResult = null) {
// 1. Determine visits that took place during the interval. Note
// that the database uses microseconds, while JS uses milliseconds,
// so we need to *1000 one way and /1000 the other way.
let dates = {
conditions: [],
args: {},
};
if ("beginDate" in filter) {
dates.conditions.push("visit_date >= :begin * 1000");
dates.args.begin = Number(filter.beginDate);
}
if ("endDate" in filter) {
dates.conditions.push("visit_date <= :end * 1000");
dates.args.end = Number(filter.endDate);
}
let visitsToRemove = [];
let pagesToInspect = new Set();
let onResultData = onResult ? [] : null;
yield db.executeCached(
`SELECT id, place_id, visit_date / 1000 AS date, visit_type FROM moz_historyvisits
WHERE ${ dates.conditions.join(" AND ") }`,
dates.args,
row => {
let id = row.getResultByName("id");
let place_id = row.getResultByName("place_id");
visitsToRemove.push(id);
pagesToInspect.add(place_id);
if (onResult) {
onResultData.push({
date: new Date(row.getResultByName("date")),
transition: row.getResultByName("visit_type")
});
}
}
);
try {
if (visitsToRemove.length == 0) {
// Nothing to do
return false;
}
let pages = [];
yield db.executeTransaction(function*() {
// 2. Remove all offending visits.
yield db.execute(`DELETE FROM moz_historyvisits
WHERE id IN (${ sqlList(visitsToRemove) } )`);
// 3. Find out which pages have been orphaned
yield db.execute(
`SELECT id, url, guid,
(foreign_count != 0) AS has_foreign,
(last_visit_date NOTNULL) as has_visits
FROM moz_places
WHERE id IN (${ sqlList([...pagesToInspect]) })`,
null,
row => {
let page = {
id: row.getResultByName("id"),
guid: row.getResultByName("guid"),
hasForeign: row.getResultByName("has_foreign"),
hasVisits: row.getResultByName("has_visits"),
url: new URL(row.getResultByName("url")),
};
pages.push(page);
});
// 4. Clean up and notify
yield cleanupPages(db, pages);
});
notifyCleanup(db, pages);
notifyOnResult(onResultData, onResult); // don't wait
} finally {
// Ensure we cleanup embed visits, even if we bailed out early.
PlacesUtils.history.clearEmbedVisits();
}
return visitsToRemove.length != 0;
});
// Inner implementation of History.remove.
let remove = Task.async(function*(db, {guids, urls}, onResult = null) {
// 1. Find out what needs to be removed
let query =
`SELECT id, url, guid, foreign_count, title, frecency FROM moz_places
WHERE guid IN (${ sqlList(guids) })
OR url IN (${ sqlList(urls) })
`;
let onResultData = onResult ? [] : null;
let pages = [];
let hasPagesToKeep = false;
let hasPagesToRemove = false;
yield db.execute(query, null, Task.async(function*(row) {
let hasForeign = row.getResultByName("foreign_count") != 0;
if (hasForeign) {
hasPagesToKeep = true;
} else {
hasPagesToRemove = true;
}
let id = row.getResultByName("id");
let guid = row.getResultByName("guid");
let url = row.getResultByName("url");
let page = {
id,
guid,
hasForeign,
hasVisits: false,
url: new URL(url),
};
pages.push(page);
if (onResult) {
onResultData.push({
guid: guid,
title: row.getResultByName("title"),
frecency: row.getResultByName("frecency"),
url: new URL(url)
});
}
}));
try {
if (pages.length == 0) {
// Nothing to do
return false;
}
yield db.executeTransaction(function*() {
// 2. Remove all visits to these pages.
yield db.execute(`DELETE FROM moz_historyvisits
WHERE place_id IN (${ sqlList([p.id for (p of pages)]) })
`);
// 3. Clean up and notify
yield cleanupPages(db, pages);
});
notifyCleanup(db, pages);
notifyOnResult(onResultData, onResult); // don't wait
} finally {
// Ensure we cleanup embed visits, even if we bailed out early.
PlacesUtils.history.clearEmbedVisits();
}
return hasPagesToRemove;
});