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fix: retry all streaming errors #687

Merged
merged 3 commits into from
Dec 19, 2024
Merged

fix: retry all streaming errors #687

merged 3 commits into from
Dec 19, 2024

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kwasniew
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@kwasniew kwasniew commented Dec 19, 2024

About the changes

Improving retry on streaming behavior.
Previously we were only retrying on 500 codes.

Details:

  • handling unleash-connected event but we ignore it on first connect. First connect is done with a regular fetch for a safety fallback e.g. when server doesn't support streaming
  • telling eventsource client to retry all types of errors so when some network proxy ends the connection without sending HTTP code we still re-connect and refetch the features from the unleash-connected event data (no data updated during proxy downtime is lost as a result)

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@coveralls
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coveralls commented Dec 19, 2024

Coverage Status

coverage: 90.377% (-0.01%) from 90.39%
when pulling 33c250d on retry-all-streaming-errors
into 098551c on main.

const before = repo.getToggles();
t.deepEqual(before, []);
t.deepEqual(before, [{ ...feature, name: 'initialFetch' }]);
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test showing initial fetch is outside of the streaming flow

// first connection is ignored, since we do regular fetch
eventSource.emit('unleash-connected', {
type: 'unleash-connected',
data: JSON.stringify({ meta: {}, features: [{ ...feature, name: 'intialConnectedIgnored' }] }),
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show that initial streaming connect is ignored

thomasheartman
thomasheartman previously approved these changes Dec 19, 2024
@kwasniew kwasniew merged commit 60807bf into main Dec 19, 2024
4 checks passed
@kwasniew kwasniew deleted the retry-all-streaming-errors branch December 19, 2024 10:22
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3 participants