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fix: do not allow multiple concurrent syncs

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This commit is contained in:
thecodrr
2021-08-10 11:59:26 +05:00
parent 890d0f5076
commit 1ca53f939e
1 changed files with 24 additions and 15 deletions
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39
packages/core/api/sync/index.js
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@@ -42,6 +42,7 @@ export default class Sync {
this._collector = new Collector(this._db);
this._merger = new Merger(this._db);
this._tokenManager = new TokenManager(this._db);
this._isSyncing = false;
}
async _fetch(lastSynced, token) {
@@ -52,6 +53,7 @@ export default class Sync {
}
async _performChecks() {
if (this._isSyncing) throw new Error("Sync already running.");
let lastSynced = (await this._db.context.read("lastSynced")) || 0;
let token = await this._tokenManager.getAccessToken();
if (!token) throw new Error("You need to login to sync.");
@@ -65,28 +67,35 @@ export default class Sync {
async start(full, force) {
if (force) await this._db.context.write("lastSynced", 0);
let { lastSynced, token } = await this._performChecks();
if (full) var serverResponse = await this._fetch(lastSynced, token);
try {
this._isSyncing = true;
// we prepare local data before merging so we always have correct data
const data = await this._collector.collect(lastSynced);
if (full) var serverResponse = await this._fetch(lastSynced, token);
if (full) {
// merge the server response
await this._merger.merge(serverResponse, lastSynced);
}
// we prepare local data before merging so we always have correct data
const data = await this._collector.collect(lastSynced);
// check for conflicts and throw
await this._db.conflicts.check();
if (full) {
// merge the server response
await this._merger.merge(serverResponse, lastSynced);
}
// send the data back to server
lastSynced = await this._send(data, token);
// check for conflicts and throw
await this._db.conflicts.check();
// update our lastSynced time
if (lastSynced) {
await this._db.context.write("lastSynced", lastSynced);
// send the data back to server
lastSynced = await this._send(data, token);
// update our lastSynced time
if (lastSynced) {
await this._db.context.write("lastSynced", lastSynced);
}
} catch (e) {
throw e;
} finally {
this._isSyncing = false;
}
}