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feat: slot change callback (provides real-time fork information)

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This commit is contained in:
Sunny Gleason
2019-11-25 11:04:35 -05:00
committed by Michael Vines
parent ddce1d3c9f
commit 286891fa51
3 changed files with 166 additions and 1 deletions
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36
web3.js/test/connection.test.js
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@ -931,3 +931,39 @@ test('program account change notification', async () => {
await connection.removeProgramAccountChangeListener(subscriptionId);
});
test('slot notification', async () => {
if (mockRpcEnabled) {
console.log('non-live test skipped');
return;
}
const connection = new Connection(url, 'recent');
// let notified = false;
const subscriptionId = connection.onSlotChange(slotInfo => {
expect(slotInfo.parent).toBeDefined();
expect(slotInfo.slot).toBeDefined();
expect(slotInfo.root).toBeDefined();
expect(slotInfo.slot).toBeGreaterThan(slotInfo.parent);
expect(slotInfo.slot).toBeGreaterThanOrEqual(slotInfo.root);
// notified = true;
});
//
// FIXME: enable this check when slotNotification is live
//
// // Wait for mockCallback to receive a call
// let i = 0;
// while (!notified) {
// //for (;;) {
// if (++i === 30) {
// throw new Error('Slot change notification not observed');
// }
// // Sleep for a 1/4 of a slot, notifications only occur after a block is
// // processed
// await sleep((250 * DEFAULT_TICKS_PER_SLOT) / NUM_TICKS_PER_SECOND);
// }
await connection.removeSlotChangeListener(subscriptionId);
});