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Bug 1643194 - Do not build sync results if client has no listener r=Gijs

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Building the sync event data has an extra cost on large collections. This bypasses iterations or records in case the client has no listener.

Differential Revision: https://phabricator.services.mozilla.com/D81046
This commit is contained in:
Mathieu Leplatre 2020-06-26 08:56:14 +00:00
parent 800ef13016
commit ceaf07c1e6
1 changed files with 44 additions and 34 deletions
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78
services/settings/RemoteSettingsClient.jsm
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@ -98,6 +98,10 @@ class EventEmitter {
}
}
hasListeners(event) {
return this._listeners.has(event) && this._listeners.get(event).length > 0;
}
on(event, callback) {
if (!this._listeners.has(event)) {
throw new Error(`Unknown event type ${event}`);
@ -566,23 +570,26 @@ class RemoteSettingsClient extends EventEmitter {
"duration"
);
}
// The records imported from the dump should be considered as "created" for the
// listeners.
const importedById = importedFromDump.reduce((acc, r) => {
acc.set(r.id, r);
return acc;
}, new Map());
// Deleted records should not appear as created.
syncResult.deleted.forEach(r => importedById.delete(r.id));
// Records from dump that were updated should appear in their newest form.
syncResult.updated.forEach(u => {
if (importedById.has(u.old.id)) {
importedById.set(u.old.id, u.new);
}
});
syncResult.created = syncResult.created.concat(
Array.from(importedById.values())
);
if (this.hasListeners("sync")) {
// If we have listeners for the "sync" event, then compute the lists of changes.
// The records imported from the dump should be considered as "created" for the
// listeners.
const importedById = importedFromDump.reduce((acc, r) => {
acc.set(r.id, r);
return acc;
}, new Map());
// Deleted records should not appear as created.
syncResult.deleted.forEach(r => importedById.delete(r.id));
// Records from dump that were updated should appear in their newest form.
syncResult.updated.forEach(u => {
if (importedById.has(u.old.id)) {
importedById.set(u.old.id, u.new);
}
});
syncResult.created = syncResult.created.concat(
Array.from(importedById.values())
);
}
}
} catch (e) {
if (e instanceof InvalidSignatureError) {
@ -952,26 +959,29 @@ class RemoteSettingsClient extends EventEmitter {
console.warn(`${this.identifier} has signature disabled`);
}
// Compute the changes, comparing records before and after.
syncResult.current = newRecords;
const oldById = new Map(localRecords.map(e => [e.id, e]));
for (const r of newRecords) {
const old = oldById.get(r.id);
if (old) {
oldById.delete(r.id);
if (r.last_modified != old.last_modified) {
syncResult.updated.push({ old, new: r });
if (this.hasListeners("sync")) {
// If we have some listeners for the "sync" event,
// Compute the changes, comparing records before and after.
syncResult.current = newRecords;
const oldById = new Map(localRecords.map(e => [e.id, e]));
for (const r of newRecords) {
const old = oldById.get(r.id);
if (old) {
oldById.delete(r.id);
if (r.last_modified != old.last_modified) {
syncResult.updated.push({ old, new: r });
}
} else {
syncResult.created.push(r);
}
} else {
syncResult.created.push(r);
}
syncResult.deleted = syncResult.deleted.concat(
Array.from(oldById.values())
);
console.debug(
`${this.identifier} ${syncResult.created.length} created. ${syncResult.updated.length} updated. ${syncResult.deleted.length} deleted.`
);
}
syncResult.deleted = syncResult.deleted.concat(
Array.from(oldById.values())
);
console.debug(
`${this.identifier} ${syncResult.created.length} created. ${syncResult.updated.length} updated. ${syncResult.deleted.length} deleted.`
);
return syncResult;
}