tornado-packages/ethers.js
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Fixed abundant UnhandledRejectErrors in provider polling (#1084, #1208, #1221, #1235).

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This commit is contained in:
Richard Moore 2021-01-13 03:16:27 -05:00
parent 8175c83026
commit 74470defda
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GPG Key ID: 665176BE8E9DC651
1 changed files with 32 additions and 10 deletions
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42
packages/providers/src.ts/base-provider.ts
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@ -587,10 +587,18 @@ export class BaseProvider extends Provider implements EnsProvider {
const internalBlockNumber = this._internalBlockNumber;
if (maxAge > 0 && this._internalBlockNumber) {
const result = await internalBlockNumber;
if ((getTime() - result.respTime) <= maxAge) {
return result.blockNumber;
if (maxAge > 0 && internalBlockNumber) {
try {
const result = await internalBlockNumber;
if ((getTime() - result.respTime) <= maxAge) {
return result.blockNumber;
}
} catch(error) {
// Don't null the dead (rejected) fetch, if it has already been updated
if (this._internalBlockNumber === internalBlockNumber) {
this._internalBlockNumber = null;
}
throw error;
}
}
@ -620,6 +628,14 @@ export class BaseProvider extends Provider implements EnsProvider {
this._internalBlockNumber = checkInternalBlockNumber;
// Swallow unhandled exceptions; if needed they are handled else where
checkInternalBlockNumber.catch((error) => {
// Don't null the dead (rejected) fetch, if it has already been updated
if (this._internalBlockNumber === checkInternalBlockNumber) {
this._internalBlockNumber = null;
}
});
return (await checkInternalBlockNumber).blockNumber;
}
@ -629,7 +645,13 @@ export class BaseProvider extends Provider implements EnsProvider {
// Track all running promises, so we can trigger a post-poll once they are complete
const runners: Array<Promise<void>> = [];
const blockNumber = await this._getInternalBlockNumber(100 + this.pollingInterval / 2);
let blockNumber: number = null;
try {
blockNumber = await this._getInternalBlockNumber(100 + this.pollingInterval / 2);
} catch (error) {
this.emit("error", error);
return;
}
this._setFastBlockNumber(blockNumber);
// Emit a poll event after we have the latest (fast) block number
@ -733,9 +755,9 @@ export class BaseProvider extends Provider implements EnsProvider {
// Once all events for this loop have been processed, emit "didPoll"
Promise.all(runners).then(() => {
this.emit("didPoll", pollId);
});
}).catch((error) => { this.emit("error", error); });
return null;
return;
}
// Deprecated; do not use this
@ -804,7 +826,7 @@ export class BaseProvider extends Provider implements EnsProvider {
get blockNumber(): number {
this._getInternalBlockNumber(100 + this.pollingInterval / 2).then((blockNumber) => {
this._setFastBlockNumber(blockNumber);
});
}, (error) => { });
return (this._fastBlockNumber != null) ? this._fastBlockNumber: -1;
}
@ -815,7 +837,7 @@ export class BaseProvider extends Provider implements EnsProvider {
set polling(value: boolean) {
if (value && !this._poller) {
this._poller = setInterval(this.poll.bind(this), this.pollingInterval);
this._poller = setInterval(() => { this.poll(); }, this.pollingInterval);
if (!this._bootstrapPoll) {
this._bootstrapPoll = setTimeout(() => {
@ -853,7 +875,7 @@ export class BaseProvider extends Provider implements EnsProvider {
if (this._poller) {
clearInterval(this._poller);
this._poller = setInterval(() => { this.poll() }, this._pollingInterval);
this._poller = setInterval(() => { this.poll(); }, this._pollingInterval);
}
}