[Code red] handle HOSTUNREACH and EADDRNOTAVAIL syscall errors (version 3.5.0) #135
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What?
EHOSTUNREACHandEADDRNOTAVAILsyscall errors asActiveUtils::ConnectionErrorWhy?
Resolves https://github.com/Shopify/shopify/issues/576905 and similar issues
EHOSTUNREACHis returned when a host is unreachable due to network conditions such as firewall rules.EADDRNOTAVAILis returned when the host is address is not valid - this specifically happens in Core when for hosts such aslocalhostwhich are not permitted.Although not highly prevalent, it does create noise among our exceptions and these errors are not exceptional. Below are some rough numbers on these errors (query)

We should raise these as
ActiveUtils::ConnectionErrorbecause they're generally they're not transient and retries would be ineffective. This is also helpful for existing users of this library because most are already handlingActiveUtils::ConnectionErrorappropriately