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DeviceList: bring save forward if necessary

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If save is called with a delay that would want the save to happen
sooner then the save we currently have scheduled, cancel the
current save and schedule a new one for the sooner time.
This commit is contained in:
David Baker
2018-03-08 15:35:35 +00:00
parent 3d1fcc6f83
commit facfcf679d
1 changed files with 39 additions and 8 deletions
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47
src/crypto/DeviceList.js
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@@ -92,6 +92,12 @@ export default class DeviceList {
// Promise resolved when device data is saved
this._savePromise = null;
// Function that resolves the save promise
this._resolveSavePromise = null;
// The time the save is scheduled for
this._savePromiseTime = null;
// The timer used to delay the save
this._saveTimer = null;
}
/**
@@ -159,17 +165,42 @@ export default class DeviceList {
if (!this._dirty) return Promise.resolve(false);
if (delay === undefined) delay = 500;
if (this._savePromise === null) {
const targetTime = Date.now + delay;
if (this._savePromiseTime && targetTime < this._savePromiseTime) {
// There's a save scheduled but for after we would like: cancel
// it & schedule one for the time we want
clearTimeout(this._saveTimer);
this._saveTimer = null;
this._savePromiseTime = null;
// (but keep the save promise since whatever called save before
// will still want to know when the save is done)
}
let savePromise = this._savePromise;
if (savePromise === null) {
savePromise = new Promise((resolve, reject) => {
this._resolveSavePromise = resolve;
});
this._savePromise = savePromise;
}
if (this._saveTimer === null) {
// Delay saves for a bit so we can aggregate multiple saves that happen
// in quick succession (eg. when a whole room's devices are marked as known)
this._savePromise = Promise.delay(delay).then(() => {
const resolveSavePromise = this._resolveSavePromise;
this._savePromiseTime = targetTime;
this._saveTimer = setTimeout(() => {
console.log('Saving device tracking data at token ' + this._syncToken);
// null out savePromise now (after the delay but before the write),
// otherwise we could return the existing promise when the save has
// actually already happened. Likewise for the dirty flag.
this._savePromiseTime = null;
this._saveTimer = null;
this._savePromise = null;
this._resolveSavePromise = null;
this._dirty = false;
return this._cryptoStore.doTxn(
this._cryptoStore.doTxn(
'readwrite', [IndexedDBCryptoStore.STORE_DEVICE_DATA], (txn) => {
this._cryptoStore.storeEndToEndDeviceData({
devices: this._devices,
@@ -177,12 +208,12 @@ export default class DeviceList {
syncToken: this._syncToken,
}, txn);
},
);
}).then(() => {
return true;
});
).then(() => {
resolveSavePromise();
});
}, delay);
}
return this._savePromise;
return savePromise;
}
/**