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Fall back on query when header from subscription is too high

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This commit is contained in:
Simon Warta 2020-08-18 13:05:34 +02:00
parent f639074d93
commit ef74fefe84
1 changed files with 9 additions and 4 deletions
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13
packages/stargate/src/queries/queryclient.ts
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@ -230,7 +230,7 @@ export class QueryClient {
}
const searchHeight = height + 1;
let nextHeader: Header;
let nextHeader: Header | undefined;
let headersSubscription: Stream<NewBlockHeaderEvent> | undefined;
try {
headersSubscription = this.tmClient.subscribeNewBlockHeader();
@ -239,9 +239,14 @@ export class QueryClient {
}
if (headersSubscription) {
// get the header for height+1
nextHeader = await firstEvent(headersSubscription); // TODO: fall back on polling if this returns a too high header
} else {
const firstHeader = await firstEvent(headersSubscription);
// The first header we get might not be n+1 but n+2 or even higher. In such cases we fall back on a query.
if (firstHeader.height === searchHeight) {
nextHeader = firstHeader;
}
}
if (!nextHeader) {
// start from current height to avoid backend error for minHeight in the future
let header = (await this.tmClient.blockchain(height, searchHeight)).blockMetas
.map((meta) => meta.header)