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untested fix: RSS ingester runs in a hot loop #109

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untested fix: RSS ingester runs in a hot loop #109

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2 changes: 1 addition & 1 deletion packages/repco-core/src/datasource.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -518,7 +518,7 @@ export async function ingestUpdatesFromDataSource(
`ingest ${uid}: ${records.length} records, ${entities.length} entities, ${errors.length} errors`,
)

const finished = records.length === 0
const finished = records.length === 0 || nextCursor == cursor
if (errors) {
for (const error of errors) {
log.warn({
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19 changes: 13 additions & 6 deletions packages/repco-core/src/datasources/rss.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -229,7 +229,7 @@ export class RssDataSource extends BaseDataSource implements DataSource {
// This means: Increase page number to keep fetching untilwe reach the most recent pub date.
} else {
nextCursor = {
lastCompletionDate: cursor.lastCompletionDate,
lastCompletionDate: mostRecentPubDate,
pageNumber: page + 1,
mostRecentPubDate,
leastRecentPubDate,
Expand Down Expand Up @@ -264,7 +264,6 @@ export class RssDataSource extends BaseDataSource implements DataSource {
// }

async fetchPage(url: URL): Promise<string> {
// console.log('FETCH', url.toString())
const maxRetries = 50
let timeout = 1
let retries = 0
Expand Down Expand Up @@ -303,14 +302,23 @@ export class RssDataSource extends BaseDataSource implements DataSource {

async fetchUpdates(cursorInput: string | null): Promise<FetchUpdatesResult> {
const cursor = parseCursor(cursorInput)
const nextCursor = cursor
const date = new Date()
const { url, xml } = await this._crawlNewestUntil(cursor.newest)

try {
const feed = await this.parser.parseString(xml)
feed.items = feed.items.filter((item) => item.link != undefined)
cursor.newest = this.extractNextCursor(cursor.newest, feed)
const nextNewestCursor = this.extractNextCursor(cursor.newest, feed)

// If the cursor didn't change, there are no new records on the page, so do early return
if (JSON.stringify(nextNewestCursor) === JSON.stringify(cursor.newest)) {
return { cursor: JSON.stringify(cursor), records: [] }
}

const nextCursor = {
newest: nextNewestCursor,
oldest: cursor.oldest,
}

const sourceUri = new URL(this.endpoint)
sourceUri.hash = date.toISOString()
Expand All @@ -327,9 +335,8 @@ export class RssDataSource extends BaseDataSource implements DataSource {
}
} catch (err) {
log.error(`Failed to parse feed from ${url.toString()}: ${err}`)
if (nextCursor.newest.pageNumber) nextCursor.newest.pageNumber += 1
return {
cursor: JSON.stringify(nextCursor),
cursor: JSON.stringify(cursor),
records: [],
}
}
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