gecko-dev/toolkit/modules/AsyncPrefs.jsm

206 строки
5.3 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";
var EXPORTED_SYMBOLS = ["AsyncPrefs"];
const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
const kInChildProcess =
Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT;
const kAllowedPrefs = new Set([
// NB: please leave the testing prefs at the top, and sort the rest alphabetically if you add
// anything.
"testing.allowed-prefs.some-bool-pref",
"testing.allowed-prefs.some-char-pref",
"testing.allowed-prefs.some-int-pref",
"narrate.rate",
"narrate.voice",
"reader.font_size",
"reader.font_type",
"reader.color_scheme",
"reader.content_width",
"reader.line_height",
]);
const kPrefTypeMap = new Map([
["boolean", Services.prefs.PREF_BOOL],
["number", Services.prefs.PREF_INT],
["string", Services.prefs.PREF_STRING],
]);
function maybeReturnErrorForReset(pref) {
if (!kAllowedPrefs.has(pref)) {
return `Resetting pref ${pref} from content is not allowed.`;
}
return false;
}
function maybeReturnErrorForSet(pref, value) {
if (!kAllowedPrefs.has(pref)) {
return `Setting pref ${pref} from content is not allowed.`;
}
let valueType = typeof value;
if (!kPrefTypeMap.has(valueType)) {
return `Can't set pref ${pref} to value of type ${valueType}.`;
}
let prefType = Services.prefs.getPrefType(pref);
if (
prefType != Services.prefs.PREF_INVALID &&
prefType != kPrefTypeMap.get(valueType)
) {
return `Can't set pref ${pref} to a value with type ${valueType} that doesn't match the pref's type ${prefType}.`;
}
return false;
}
var AsyncPrefs;
if (kInChildProcess) {
let gUniqueId = 0;
let gMsgMap = new Map();
AsyncPrefs = {
set(pref, value) {
let error = maybeReturnErrorForSet(pref, value);
if (error) {
return Promise.reject(error);
}
let msgId = ++gUniqueId;
return new Promise((resolve, reject) => {
gMsgMap.set(msgId, { resolve, reject });
Services.cpmm.sendAsyncMessage("AsyncPrefs:SetPref", {
pref,
value,
msgId,
});
});
},
reset(pref) {
let error = maybeReturnErrorForReset(pref);
if (error) {
return Promise.reject(error);
}
let msgId = ++gUniqueId;
return new Promise((resolve, reject) => {
gMsgMap.set(msgId, { resolve, reject });
Services.cpmm.sendAsyncMessage("AsyncPrefs:ResetPref", { pref, msgId });
});
},
receiveMessage(msg) {
let promiseRef = gMsgMap.get(msg.data.msgId);
if (promiseRef) {
gMsgMap.delete(msg.data.msgId);
if (msg.data.success) {
promiseRef.resolve();
} else {
promiseRef.reject(msg.data.message);
}
}
},
};
Services.cpmm.addMessageListener("AsyncPrefs:PrefSetFinished", AsyncPrefs);
Services.cpmm.addMessageListener("AsyncPrefs:PrefResetFinished", AsyncPrefs);
} else {
AsyncPrefs = {
methodForType: {
number: "setIntPref",
boolean: "setBoolPref",
string: "setCharPref",
},
set(pref, value) {
let error = maybeReturnErrorForSet(pref, value);
if (error) {
return Promise.reject(error);
}
let methodToUse = this.methodForType[typeof value];
try {
Services.prefs[methodToUse](pref, value);
return Promise.resolve(value);
} catch (ex) {
Cu.reportError(ex);
return Promise.reject(ex.message);
}
},
reset(pref) {
let error = maybeReturnErrorForReset(pref);
if (error) {
return Promise.reject(error);
}
try {
Services.prefs.clearUserPref(pref);
return Promise.resolve();
} catch (ex) {
Cu.reportError(ex);
return Promise.reject(ex.message);
}
},
receiveMessage(msg) {
if (msg.name == "AsyncPrefs:SetPref") {
this.onPrefSet(msg);
} else {
this.onPrefReset(msg);
}
},
onPrefReset(msg) {
let { pref, msgId } = msg.data;
this.reset(pref).then(
function() {
msg.target.sendAsyncMessage("AsyncPrefs:PrefResetFinished", {
msgId,
success: true,
});
},
function(msg) {
msg.target.sendAsyncMessage("AsyncPrefs:PrefResetFinished", {
msgId,
success: false,
message: msg,
});
}
);
},
onPrefSet(msg) {
let { pref, value, msgId } = msg.data;
this.set(pref, value).then(
function() {
msg.target.sendAsyncMessage("AsyncPrefs:PrefSetFinished", {
msgId,
success: true,
});
},
function(msg) {
msg.target.sendAsyncMessage("AsyncPrefs:PrefSetFinished", {
msgId,
success: false,
message: msg,
});
}
);
},
init() {
// PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN nsBrowserGlue
Services.ppmm.addMessageListener("AsyncPrefs:SetPref", this);
Services.ppmm.addMessageListener("AsyncPrefs:ResetPref", this);
// PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN nsBrowserGlue
},
};
}