Retry upload requests under certain conditions #210
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zachmullen
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I've tested this manually, so I'm marking it ready for review. One thing I discovered is that shutting down my minio worked well to simulate an axios network error, but Chrome devtools switching to "offline" mode triggers a different error type that I'm not sure we should attempt to catch. There is no test framework in this repository yet, so I haven't added any unit tests. I think it would be good to do so, but I didn't want to blow up the scope of the PR. |
| const axiosErr = (error as AxiosError); | ||
| return axiosErr.isAxiosError && ( | ||
| !axiosErr.response | ||
| || [429, 500, 502, 503, 504].includes(axiosErr.response.status) |
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Why not all 5xx errors?
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@danlamanna suggested this list, and I added one extra code to his suggestion. I think I prefer a whitelist of specific codes, such that any "unexpected" situation will break out of our retry loop, but I'm happy to expand that list if there are other codes you want to add.
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429 makes sense, but I think we should retry the entire range of 5xx errors unless we know it's inappropriate. @danlamanna what do you think?
| ); | ||
| } | ||
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| async function retry<T>( |
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What do you think about using one of these:
I prefer https://www.npmjs.com/package/retry-axios , since it uses proper Axios interceptors.
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Personally I'd prefer not to have to rewrite this, but if you think using one of those libraries is going to be a better experience, go ahead and make the decision.
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Using https://www.npmjs.com/package/retry-axios has the potential to remove most of the code (and maintenance burden) here, I think it would be worth trying. @zachmullen If you don't have time, I'd be happy to try adding it.
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FWIW, I'm using axios-retry in NLI, and it works fine. retry-axios does look a little more refined though.
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@brianhelba that would be great if you want to take a crack at it. 👍
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Not 100% sure, but from the README it looks like axios-retry doesn't have a callback when retry is happening, but retry-axios does.
| @@ -140,15 +186,18 @@ export default class S3FileFieldClient { | |||
| protected async completeUpload( | |||
| multipartInfo: MultipartInfo, parts: UploadedPart[], | |||
| ): Promise<void> { | |||
| const response = await this.api.post('upload-complete/', { | |||
| const response = await retry<AxiosResponse>(() => this.api.post('upload-complete/', { | |||
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Since POST is not necessarily idempotent, do we know what happens if a client re-calls the endpoint mistakenly (perhaps due to the network dropping only the response)?
If this endpoint is actually idempotent, maybe we should change it to a PUT request.
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I think either the endpoint should be idempotent, or if not, it should return 400 if a duplicate happens, which would break us out of the loop.
| @@ -168,8 +219,10 @@ export default class S3FileFieldClient { | |||
| * @param multipartInfo Signed information returned from /upload-complete/. | |||
| */ | |||
| protected async finalize(multipartInfo: MultipartInfo): Promise<string> { | |||
| const response = await this.api.post('finalize/', { | |||
| const response = await retry<AxiosResponse>(() => this.api.post('finalize/', { | |||
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Again, do we know what happens when this is called repeatedly?
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Hopefully either 200 OK or 400 bad request. I don't know for sure.
| // Send the CompleteMultipartUpload operation to S3 | ||
| await axios.post(completeUrl, body, { | ||
| await retry<AxiosResponse>(() => axios.post(completeUrl, body, { |
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I assume that if this is called repeatedly, AWS will either:
- idempotently succeed again, which is fine
- return an error in the body, which is unrecoverable (and the retries should stop)
I don't think we need to do anything more here, but we should be sure to handle this with #209.
Just posting this as a draft for preliminary review. I still need to test it manually. It's also a reasonable target for automated testing.