Fix configuration merging for implicit tproxy upstreams. #16000
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Change the merging logic so that the wildcard upstream has correct proxy-defaults and service-defaults values combined into it. It did not previously merge all fields, and the wildcard upstream did not exist unless service-defaults existed (it ignored proxy-defaults, essentially). Change the way we fetch upstream configuration in the xDS layer so that it falls back to the wildcard when no matching upstream is found. This is what allows implicit peer upstreams to have the correct "merged" config. Change proxycfg to always watch local mesh gateway endpoints whenever a peer upstream is found. This simplifies the logic so that we do not have to inspect the "merged" configuration on peer upstreams to extract the mesh gateway mode.
hashi-derek
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ndhanushkodi
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Fix configuration merging for implicit tproxy upstreams. Change the merging logic so that the wildcard upstream has correct proxy-defaults and service-defaults values combined into it. It did not previously merge all fields, and the wildcard upstream did not exist unless service-defaults existed (it ignored proxy-defaults, essentially). Change the way we fetch upstream configuration in the xDS layer so that it falls back to the wildcard when no matching upstream is found. This is what allows implicit peer upstreams to have the correct "merged" config. Change proxycfg to always watch local mesh gateway endpoints whenever a peer upstream is found. This simplifies the logic so that we do not have to inspect the "merged" configuration on peer upstreams to extract the mesh gateway mode.
hashi-derek
added a commit
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Jan 18, 2023
Fix configuration merging for implicit tproxy upstreams. Change the merging logic so that the wildcard upstream has correct proxy-defaults and service-defaults values combined into it. It did not previously merge all fields, and the wildcard upstream did not exist unless service-defaults existed (it ignored proxy-defaults, essentially). Change the way we fetch upstream configuration in the xDS layer so that it falls back to the wildcard when no matching upstream is found. This is what allows implicit peer upstreams to have the correct "merged" config. Change proxycfg to always watch local mesh gateway endpoints whenever a peer upstream is found. This simplifies the logic so that we do not have to inspect the "merged" configuration on peer upstreams to extract the mesh gateway mode.
hashi-derek
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Jan 19, 2023
…6007) Fix configuration merging for implicit tproxy upstreams. Change the merging logic so that the wildcard upstream has correct proxy-defaults and service-defaults values combined into it. It did not previously merge all fields, and the wildcard upstream did not exist unless service-defaults existed (it ignored proxy-defaults, essentially). Change the way we fetch upstream configuration in the xDS layer so that it falls back to the wildcard when no matching upstream is found. This is what allows implicit peer upstreams to have the correct "merged" config. Change proxycfg to always watch local mesh gateway endpoints whenever a peer upstream is found. This simplifies the logic so that we do not have to inspect the "merged" configuration on peer upstreams to extract the mesh gateway mode.
skpratt
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Jan 25, 2023
Fix configuration merging for implicit tproxy upstreams. Change the merging logic so that the wildcard upstream has correct proxy-defaults and service-defaults values combined into it. It did not previously merge all fields, and the wildcard upstream did not exist unless service-defaults existed (it ignored proxy-defaults, essentially). Change the way we fetch upstream configuration in the xDS layer so that it falls back to the wildcard when no matching upstream is found. This is what allows implicit peer upstreams to have the correct "merged" config. Change proxycfg to always watch local mesh gateway endpoints whenever a peer upstream is found. This simplifies the logic so that we do not have to inspect the "merged" configuration on peer upstreams to extract the mesh gateway mode.
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This PR fixes an issue where tproxy would not correctly use service-defaults and proxy-defaults for implicit upstreams. Normally, we handle this by taking configuration from an auto-generated wildcard
*upstream, but that was not done in all cases -- notably peer upstreams.The changes here are essentially:
It's worth noting that another large issue still needs to be resolved in a different PR (#15956), where the
ServiceDefaults.UpstreamConfig.Overrides[].Peerfield does NOT exist. This manifests in two ways after these changes:agent/configentry/merge_service_config.goandagent/configentry/resolve.goare oblivious to the concept of a peer.default/default/mysvc?peer=cluster-02, but the overrides UID isdefault/default/mysvc. This is technically correct behavior, but it's noted here, because overrides will NOT work for peer upstreams in tproxy mode until theagent/configentrypackage is updated.