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Fixing a bug where failing to fetch a feed could make Bubo hang

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This commit is contained in:
George Mandis 2023-06-03 15:28:29 -04:00
parent 04696e9df6
commit 5ebc0d4952
1 changed files with 19 additions and 16 deletions
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35
src/index.ts
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@ -66,7 +66,11 @@ let completed = 0;
* and we want to build the static output. * and we want to build the static output.
*/ */
const finishBuild: () => void = async () => { const finishBuild: () => void = async () => {
console.log("\nDone fetching everything!"); completed++;
// if this isn't the last feed, just return early
if (completed !== feedListLength) return;
process.stdout.write("\nDone fetching everything!\n");
// generate the static HTML output from our template renderer // generate the static HTML output from our template renderer
const output = render({ const output = render({
@ -77,10 +81,10 @@ const finishBuild: () => void = async () => {
// write the output to public/index.html // write the output to public/index.html
await writeFile("./public/index.html", output); await writeFile("./public/index.html", output);
console.log( process.stdout.write(
`\nFinished writing to output:\n- ${feedListLength} feeds in ${benchmark( `\nFinished writing to output:\n- ${feedListLength} feeds in ${benchmark(
initTime initTime
)}\n- ${errors.length} errors` )}\n- ${errors.length} errors\n`
); );
}; };
@ -103,8 +107,7 @@ const processFeed =
}) => }) =>
async (response: Response): Promise<void> => { async (response: Response): Promise<void> => {
const body = await parseFeed(response); const body = await parseFeed(response);
completed++; //skip to the next one if this didn't work out
// skip to the next one if this didn't work out
if (!body) return; if (!body) return;
try { try {
@ -124,20 +127,19 @@ const processFeed =
}); });
contentFromAllFeeds[group].push(contents as object); contentFromAllFeeds[group].push(contents as object);
console.log( process.stdout.write(
`${success("Successfully fetched:")} ${feed} - ${benchmark(startTime)}` `${success("Successfully fetched:")} ${feed} - ${benchmark(startTime)}\n`
); );
} catch (err) { } catch (err) {
console.log( process.stdout.write(
`${error("Error processing:")} ${feed} - ${benchmark( `${error("Error processing:")} ${feed} - ${benchmark(
startTime startTime
)}\n${err}` )}\n${err}\n`
); );
errors.push(`Error processing: ${feed}\n\t${err}`); errors.push(`Error processing: ${feed}\n\t${err}`);
} }
// if this is the last feed, go ahead and build the output finishBuild();
completed === feedListLength && finishBuild();
}; };
// go through each group of feeds and process // go through each group of feeds and process
@ -150,15 +152,16 @@ const processFeeds = () => {
for (const feed of feeds) { for (const feed of feeds) {
const startTime = Date.now(); const startTime = Date.now();
setTimeout(() => { setTimeout(() => {
console.log(`Fetching: ${feed}...`); process.stdout.write(`Fetching: ${feed}...\n`);
fetch(feed) fetch(feed)
.then(processFeed({ group, feed, startTime })) .then(processFeed({ group, feed, startTime }))
.catch(err => { .catch(err => {
console.log( process.stdout.write(
error(`Error fetching ${feed} ${benchmark(startTime)}`) error(`Error fetching ${feed} ${benchmark(startTime)}\n`)
); );
errors.push(`Error fetching ${feed} ${err.toString()}`); errors.push(`Error fetching ${feed} ${err.toString()}\n`);
finishBuild();
}); });
}, (idx % (feedListLength / MAX_CONNECTIONS)) * DELAY_MS); }, (idx % (feedListLength / MAX_CONNECTIONS)) * DELAY_MS);
idx++; idx++;
@ -166,4 +169,4 @@ const processFeeds = () => {
} }
}; };
processFeeds(); processFeeds();