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update user sync to allow for multiple auction syncs #3984

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merged 1 commit into from
Jul 22, 2019
Merged

update user sync to allow for multiple auction syncs #3984

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30 changes: 19 additions & 11 deletions src/userSync.js
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Original file line number Diff line number Diff line change
Expand Up @@ -24,16 +24,16 @@ export function newUserSync(userSyncDependencies) {
// Let getDefaultQueue() set the defaults
let queue = getDefaultQueue();

// Whether or not user syncs have been trigger on this page load
let hasFired = false;
// Whether or not user syncs have been trigger on this page load for a specific bidder
let hasFiredBidder = new Set();
// How many bids for each adapter
let numAdapterBids = {};

// for now - default both to false in case filterSettings config is absent/misconfigured
let permittedPixels = {
image: false,
iframe: false
}
};

// Use what is in config by default
let usConfig = userSyncDependencies.config;
Expand Down Expand Up @@ -61,7 +61,7 @@ export function newUserSync(userSyncDependencies) {
* @private
*/
function fireSyncs() {
if (!usConfig.syncEnabled || !userSyncDependencies.browserSupportsCookies || (!usConfig.enableOverride && hasFired)) {
if (!usConfig.syncEnabled || !userSyncDependencies.browserSupportsCookies) {
return;
}

Expand All @@ -75,7 +75,16 @@ export function newUserSync(userSyncDependencies) {
}
// Reset the user sync queue
queue = getDefaultQueue();
hasFired = true;
}

function forEachFire(queue, fn) {
// Randomize the order of the pixels before firing
// This is to avoid giving any bidder who has registered multiple syncs
// any preferential treatment and balancing them out
utils.shuffle(queue).forEach((sync) => {
fn(sync);
hasFiredBidder.add(sync[0]);
});
}

/**
Expand All @@ -87,10 +96,7 @@ export function newUserSync(userSyncDependencies) {
if (!(usConfig.pixelEnabled || permittedPixels.image)) {
return;
}
// Randomize the order of the pixels before firing
// This is to avoid giving any bidder who has registered multiple syncs
// any preferential treatment and balancing them out
utils.shuffle(queue.image).forEach((sync) => {
forEachFire(queue.image, (sync) => {
let [bidderName, trackingPixelUrl] = sync;
utils.logMessage(`Invoking image pixel user sync for bidder: ${bidderName}`);
// Create image object and add the src url
Expand All @@ -107,8 +113,7 @@ export function newUserSync(userSyncDependencies) {
if (!(usConfig.iframeEnabled || permittedPixels.iframe)) {
return;
}
// Randomize the order of these syncs just like the pixels above
utils.shuffle(queue.iframe).forEach((sync) => {
forEachFire(queue.iframe, (sync) => {
let [bidderName, iframeUrl] = sync;
utils.logMessage(`Invoking iframe user sync for bidder: ${bidderName}`);
// Insert iframe into DOM
Expand Down Expand Up @@ -146,6 +151,9 @@ export function newUserSync(userSyncDependencies) {
* userSync.registerSync('image', 'rubicon', 'http://example.com/pixel')
*/
publicApi.registerSync = (type, bidder, url) => {
if (hasFiredBidder.has(bidder)) {
return utils.logWarn(`already registered syncs for "${bidder}"`);
}
if (!usConfig.syncEnabled || !utils.isArray(queue[type])) {
return utils.logWarn(`User sync type "${type}" not supported`);
}
Expand Down
7 changes: 5 additions & 2 deletions test/spec/userSync_spec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -98,15 +98,18 @@ describe('user sync', function () {
expect(insertUserSyncIframeStub.getCall(0).args[0]).to.equal('http://example.com/iframe');
});

it('should only trigger syncs once per page', function () {
it('should only trigger syncs once per page per bidder', function () {
const userSync = newTestUserSync({pixelEnabled: true});
userSync.registerSync('image', 'testBidder', 'http://example.com/1');
userSync.syncUsers();
userSync.registerSync('image', 'testBidder', 'http://example.com/2');
userSync.registerSync('image', 'testBidder2', 'http://example.com/3');
userSync.syncUsers();
expect(triggerPixelStub.callCount).to.equal(2);
expect(triggerPixelStub.getCall(0)).to.not.be.null;
expect(triggerPixelStub.getCall(0).args[0]).to.exist.and.to.equal('http://example.com/1');
expect(triggerPixelStub.getCall(1)).to.be.null;
expect(triggerPixelStub.getCall(1)).to.not.be.null;
expect(triggerPixelStub.getCall(1).args[0]).to.exist.and.to.equal('http://example.com/3');
});

it('should not fire syncs if cookies are not supported', function () {
Expand Down