Limit per-host concurrency and add retries #217
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Configuration minimizes impact of retries
theunrepentantgeek
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| @@ -280,6 +275,39 @@ func (hT *HTMLTest) checkExternal(ref *htmldoc.Reference) { | |||
| // TODO check a hash id exists in external page if present in reference (URL.Fragment) | |||
| } | |||
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| var hostChannelsLock sync.Mutex // Lock used to prevent concurrent updates to hostChannels | |||
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I initially added this as a member of HTMLTest but that in turn required setRedirectLimitCheck() to be modified by passing a reference instead of a value; this broke redirection tests by increasing the number of issues found from 1 to 2.
Making this a global is slightly suboptimal, but seemed to be a reasonable compromise. Happy to move it back into HTMLTest if that's a better spot for it to live.
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Limits the number of concurrent requests to a single host in order to reduce (hopefully to eliminate) errors where the server objects. Also adds automatic retries (with exponential backoff) to further mitigate transient errors.
Partial mitigation of #152.
Closes #103
Closes #25
The introduction of retries has required update of the VCR recordings; the actual changes are fairly limited in scope - I deliberately chose
retryablehttpbecause it was a near seamless drop in replacement.Marked as draft because too many commits have been pulled in by Github.Fixed by rebasing this PR. Might have conflicts if #215 is merged first; I'll remedy those if that happens.