Add Metrics to RetryableHTTPClient #4545
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…tedTransport to RetryableHTTPClient
amanfcp
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Nov 7, 2025
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| // wrap the response body to count bytes read | ||
| resp.Body = &responseSizeCounterReadCloser{ | ||
| ReadCloser: resp.Body, | ||
| recordSizeFunc: func(size int) { | ||
| // Record response body size | ||
| recordResponseBodySize(sanitizedURL, size) | ||
| }, | ||
| } |
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This would also start generating metrics for SaneHTTPClient. Just wanna make sure if this is intentional.
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Description:
This PR adds a new HTTP response body size metric to
InstrumentedTransport, which is the currentTransportforSaneHTTPClient.InstrumentedTransportis also set to be used as theTransportforRetryableHTTPClient.Challenge with Response Body Size Calculation:
Responseobject has aContentLengthfield that may have exactly what we're looking for, but it is not guaranteed to be provided by the server. Also it is never available for a chunked response.RoundTrip()call, and would require restoring the body so that downstream code can read it again.Solution:
To address this, a
responseSizeCounterReadCloseris introduced to measure the size of the response body WHILE the downstream code reads it. This ensures no overhead is added in theRoundTrip()call. This however will not work if the downstream code never reads the body (e.g. detectors where only theStatusCodeis used to verify), so to handle this, we add a check in theClose()method of theReadCloserto drain the body if it's not consumed.Checklist:
make test-community)?make lintthis requires golangci-lint)?