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Fix Weighted Invalid Backend Logic #4911

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Dec 13, 2024
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36 changes: 15 additions & 21 deletions internal/xds/translator/route.go
Original file line number Diff line number Diff line change
Expand Up @@ -244,39 +244,33 @@
Weight: &wrapperspb.UInt32Value{Value: backendWeights.Invalid},
}
weightedClusters = append(weightedClusters, invalidCluster)
return &routev3.RouteAction{
// Intentionally route to a non-existent cluster and return a 500 error when it is not found
ClusterNotFoundResponseCode: routev3.RouteAction_INTERNAL_SERVER_ERROR,
ClusterSpecifier: &routev3.RouteAction_WeightedClusters{
WeightedClusters: &routev3.WeightedCluster{
Clusters: weightedClusters,
},
},
}
}

for _, destinationSetting := range settings {
if destinationSetting.Filters != nil {
if len(destinationSetting.Endpoints) > 0 {
validCluster := &routev3.WeightedCluster_ClusterWeight{
Name: backendWeights.Name,
Weight: &wrapperspb.UInt32Value{Value: *destinationSetting.Weight},
}

if len(destinationSetting.Filters.AddRequestHeaders) > 0 {
validCluster.RequestHeadersToAdd = append(validCluster.RequestHeadersToAdd, buildXdsAddedHeaders(destinationSetting.Filters.AddRequestHeaders)...)
}
if destinationSetting.Filters != nil {
if len(destinationSetting.Filters.AddRequestHeaders) > 0 {
validCluster.RequestHeadersToAdd = append(validCluster.RequestHeadersToAdd, buildXdsAddedHeaders(destinationSetting.Filters.AddRequestHeaders)...)
}

if len(destinationSetting.Filters.RemoveRequestHeaders) > 0 {
validCluster.RequestHeadersToRemove = append(validCluster.RequestHeadersToRemove, destinationSetting.Filters.RemoveRequestHeaders...)
}
if len(destinationSetting.Filters.RemoveRequestHeaders) > 0 {
validCluster.RequestHeadersToRemove = append(validCluster.RequestHeadersToRemove, destinationSetting.Filters.RemoveRequestHeaders...)
}

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internal/xds/translator/route.go#L262-L263

Added lines #L262 - L263 were not covered by tests

if len(destinationSetting.Filters.AddResponseHeaders) > 0 {
validCluster.ResponseHeadersToAdd = append(validCluster.ResponseHeadersToAdd, buildXdsAddedHeaders(destinationSetting.Filters.AddResponseHeaders)...)
}
if len(destinationSetting.Filters.AddResponseHeaders) > 0 {
validCluster.ResponseHeadersToAdd = append(validCluster.ResponseHeadersToAdd, buildXdsAddedHeaders(destinationSetting.Filters.AddResponseHeaders)...)
}

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internal/xds/translator/route.go#L266-L267

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if len(destinationSetting.Filters.RemoveResponseHeaders) > 0 {
validCluster.ResponseHeadersToRemove = append(validCluster.ResponseHeadersToRemove, destinationSetting.Filters.RemoveResponseHeaders...)
if len(destinationSetting.Filters.RemoveResponseHeaders) > 0 {
validCluster.ResponseHeadersToRemove = append(validCluster.ResponseHeadersToRemove, destinationSetting.Filters.RemoveResponseHeaders...)
}

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internal/xds/translator/route.go#L270-L271

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}

weightedClusters = append(weightedClusters, validCluster)
}
}
Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -16,3 +16,5 @@
clusters:
- name: invalid-backend-cluster
weight: 1
- name: first-route-dest
weight: 1
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