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js: Promisify async operations

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Promises make asynchronous operations easier to manage, in particular
when used through the async/await syntax that allows for asynchronous
code to closely resemble synchronous one.

gjs has included a Gio._promisify() helper for a while now, which
monkey-patches methods that follow GIO's async pattern to return a
Promise when called without a callback argument.

Use that to get rid of all those GAsyncReadyCallbacks!

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1126
This commit is contained in:
Florian Müllner
2019-12-19 20:50:37 +01:00
committed by Florian Müllner
parent 18742fcc32
commit 764527c8c9
20 changed files with 409 additions and 428 deletions
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82
js/gdm/util.js
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@ -2,7 +2,7 @@
/* exported BANNER_MESSAGE_KEY, BANNER_MESSAGE_TEXT_KEY, LOGO_KEY,
DISABLE_USER_LIST_KEY, fadeInActor, fadeOutActor, cloneAndFadeOutActor */
const { Clutter, Gio, GLib } = imports.gi;
const { Clutter, Gdm, Gio, GLib } = imports.gi;
const Signals = imports.signals;
const Batch = imports.gdm.batch;
@ -12,6 +12,15 @@ const Main = imports.ui.main;
const Params = imports.misc.params;
const SmartcardManager = imports.misc.smartcardManager;
Gio._promisify(Gdm.Client.prototype,
'open_reauthentication_channel', 'open_reauthentication_channel_finish');
Gio._promisify(Gdm.Client.prototype,
'get_user_verifier', 'get_user_verifier_finish');
Gio._promisify(Gdm.UserVerifierProxy.prototype,
'call_begin_verification_for_user', 'call_begin_verification_for_user_finish');
Gio._promisify(Gdm.UserVerifierProxy.prototype,
'call_begin_verification', 'call_begin_verification_finish');
var PASSWORD_SERVICE_NAME = 'gdm-password';
var FINGERPRINT_SERVICE_NAME = 'gdm-fingerprint';
var SMARTCARD_SERVICE_NAME = 'gdm-smartcard';
@ -168,14 +177,12 @@ var ShellUserVerifier = class {
this._checkForFingerprintReader();
if (userName) {
// If possible, reauthenticate an already running session,
// so any session specific credentials get updated appropriately
this._client.open_reauthentication_channel(userName, this._cancellable,
this._reauthenticationChannelOpened.bind(this));
} else {
this._client.get_user_verifier(this._cancellable, this._userVerifierGot.bind(this));
}
// If possible, reauthenticate an already running session,
// so any session specific credentials get updated appropriately
if (userName)
this._openReauthenticationChannel(userName);
else
this._getUserVerifier();
}
cancel() {
@ -339,10 +346,11 @@ var ShellUserVerifier = class {
this._verificationFailed(false);
}
_reauthenticationChannelOpened(client, result) {
async _openReauthenticationChannel(userName) {
try {
this._clearUserVerifier();
this._userVerifier = client.open_reauthentication_channel_finish(result);
this._userVerifier = await this._client.open_reauthentication_channel(
userName, this._cancellable);
} catch (e) {
if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED))
return;
@ -351,8 +359,7 @@ var ShellUserVerifier = class {
// Gdm emits org.freedesktop.DBus.Error.AccessDenied when there
// is no session to reauthenticate. Fall back to performing
// verification from this login session
client.get_user_verifier(this._cancellable,
this._userVerifierGot.bind(this));
this._getUserVerifier();
return;
}
@ -366,10 +373,11 @@ var ShellUserVerifier = class {
this._hold.release();
}
_userVerifierGot(client, result) {
async _getUserVerifier() {
try {
this._clearUserVerifier();
this._userVerifier = client.get_user_verifier_finish(result);
this._userVerifier =
await this._client.get_user_verifier(this._cancellable);
} catch (e) {
if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED))
return;
@ -421,35 +429,25 @@ var ShellUserVerifier = class {
}
}
_startService(serviceName) {
async _startService(serviceName) {
this._hold.acquire();
if (this._userName) {
this._userVerifier.call_begin_verification_for_user(serviceName, this._userName, this._cancellable, (obj, result) => {
try {
obj.call_begin_verification_for_user_finish(result);
} catch (e) {
if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED))
return;
this._reportInitError('Failed to start verification for user', e);
return;
}
this._hold.release();
});
} else {
this._userVerifier.call_begin_verification(serviceName, this._cancellable, (obj, result) => {
try {
obj.call_begin_verification_finish(result);
} catch (e) {
if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED))
return;
this._reportInitError('Failed to start verification', e);
return;
}
this._hold.release();
});
try {
if (this._userName) {
await this._userVerifier.call_begin_verification_for_user(
serviceName, this._userName, this._cancellable);
} else {
await this._userVerifier.call_begin_verification(
serviceName, this._cancellable);
}
} catch (e) {
if (e.matches(Gio.IOErrorEnum, Gio.IOErrorEnum.CANCELLED))
return;
this._reportInitError(this._userName
? 'Failed to start verification for user'
: 'Failed to start verification', e);
return;
}
this._hold.release();
}
_beginVerification() {