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Prevent IndexedDB from auto-committing too early.

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Discussion: https://twitter.com/benjamn/status/838108246841917441
This commit is contained in:
Ben Newman
2017-03-04 16:19:22 -05:00
parent ae59532f12
commit eb33152ce3
1 changed files with 28 additions and 29 deletions
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57
packages/dynamic-import/cache.js
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@@ -19,7 +19,7 @@ function withDB(callback) {
return dbPromise.then(callback);
}
var checkTxn;
var checkCount = 0;
exports.checkMany = function (versions) {
var ids = Object.keys(versions);
@@ -36,46 +36,45 @@ exports.checkMany = function (versions) {
}
return withDB(function (db) {
checkTxn = checkTxn || db.transaction([
var txn = db.transaction([
"versionsById",
"sourcesByVersion"
], "readonly");
var versionsById = checkTxn.objectStore("versionsById");
var sourcesByVersion = checkTxn.objectStore("sourcesByVersion");
var versionsById = txn.objectStore("versionsById");
var sourcesByVersion = txn.objectStore("sourcesByVersion");
++checkCount;
return Promise.all(ids.map(function (id) {
return get(versionsById, id).then(function (result) {
var previousVersion = result && result.version;
if (previousVersion === versions[id]) {
return get(
sourcesByVersion,
result.version
).then(function (result) {
if (result) {
sourcesById[id] = result.source;
}
});
}
return new Promise(function (resolve, reject) {
var versionRequest = versionsById.get(id);
versionRequest.onerror = reject;
versionRequest.onsuccess = function (event) {
var result = event.target.result;
var previousVersion = result && result.version;
if (previousVersion === versions[id]) {
var sourceRequest = sourcesByVersion.get(previousVersion);
sourceRequest.onerror = reject;
sourceRequest.onsuccess = function (event) {
var result = event.target.result;
if (result) {
sourcesById[id] = result.source;
}
resolve();
};
} else {
resolve();
}
};
});
})).then(function () {
checkTxn = null;
--checkCount;
return sourcesById;
});
});
};
function get(store, key) {
return new Promise(function (resolve, reject) {
var request = store.get(key);
request.onerror = reject;
request.onsuccess = function (event) {
resolve(event.target.result);
};
});
}
var pendingVersionsAndSourcesById = Object.create(null);
exports.setMany = function (versionsAndSourcesById) {
@@ -94,7 +93,7 @@ exports.setMany = function (versionsAndSourcesById) {
};
function flushSetMany() {
if (checkTxn) {
if (checkCount > 0) {
// If checkMany is currently underway, postpone the flush until later,
// since updating the cache is less important than reading from it.
return flushSetMany.timer = setTimeout(flushSetMany, 100);