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dataclients/kubernetes: add metadata route
Adds a special route with a predefined id `kube__metadata` that contains `False` predicate, no filters and endpoints metadata. Endpoints metadata is encoded as JSON via [data URI scheme](https://en.wikipedia.org/wiki/Data_URI_scheme) into the route backend address field. Example eskip: ``` kube__metadata: False() -> "data:application/json;base64,eyJhZGRyZXNzZXMiO..."; ... ``` This route could be used to obtain zone, node and pod names for a given address. A special route pre-processor detects and removes this route, decodes metadata and stores it as EndpointRegistry metrics. TODO: - [ ] add flag to enable metadata route - [ ] tests Fixes #1559 Signed-off-by: Alexander Yastrebov <alexander.yastrebov@zalando.de>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,181 @@ | ||
| package kubernetes | ||
|
|
||
| import ( | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
|
|
||
| log "github.com/sirupsen/logrus" | ||
| "github.com/zalando/skipper/eskip" | ||
| "github.com/zalando/skipper/predicates" | ||
| "github.com/zalando/skipper/routing" | ||
|
|
||
| snet "github.com/zalando/skipper/net" | ||
| ) | ||
|
|
||
| type MetadataPreProcessorOptions struct { | ||
| EndpointRegistry *routing.EndpointRegistry | ||
| } | ||
|
|
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| type metadataPreProcessor struct { | ||
| options MetadataPreProcessorOptions | ||
| } | ||
|
|
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| type kubeRouteMetadata struct { | ||
| Addresses []kubeRouteMetadataAddress `json:"addresses"` | ||
| } | ||
|
|
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| type kubeRouteMetadataAddress struct { | ||
| Address string `json:"address"` | ||
| Zone string `json:"zone"` | ||
| NodeName string `json:"nodeName"` | ||
| TargetRef *objectReference `json:"targetRef"` | ||
| } | ||
|
|
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| // NewMetadataPreProcessor creates pre-processor for metadata route. | ||
| func NewMetadataPreProcessor(options MetadataPreProcessorOptions) routing.PreProcessor { | ||
| return &metadataPreProcessor{options: options} | ||
| } | ||
|
|
||
| func (pp *metadataPreProcessor) Do(routes []*eskip.Route) []*eskip.Route { | ||
| var metadataRoute *eskip.Route | ||
| filtered := make([]*eskip.Route, 0, len(routes)) | ||
|
|
||
| for _, r := range routes { | ||
| if r.Id == MetadataRouteID { | ||
| if metadataRoute == nil { | ||
| metadataRoute = r | ||
| } else { | ||
| log.Errorf("Found multiple metadata routes, using the first one") | ||
| } | ||
| } else { | ||
| filtered = append(filtered, r) | ||
| } | ||
| } | ||
|
|
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| if metadataRoute == nil { | ||
| log.Errorf("Metadata route not found") | ||
| return routes | ||
| } | ||
|
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| metadata, err := decodeMetadata(metadataRoute) | ||
| if err != nil { | ||
| log.Errorf("Failed to decode metadata route: %v", err) | ||
| return filtered | ||
| } | ||
|
|
||
| for _, r := range filtered { | ||
| if r.BackendType == eskip.NetworkBackend { | ||
| pp.addMetadata(metadata, r.Backend) | ||
| } else if r.BackendType == eskip.LBBackend { | ||
| for _, ep := range r.LBEndpoints { | ||
| pp.addMetadata(metadata, ep) | ||
| } | ||
| } | ||
| } | ||
| return filtered | ||
| } | ||
|
|
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| // metadataRoute creates a route with [MetadataRouteID] id that matches no requests and | ||
| // contains metadata for each endpoint address used by Ingresses and RouteGroups. | ||
| func metadataRoute(s *clusterState) *eskip.Route { | ||
| var metadata kubeRouteMetadata | ||
| for id := range s.cachedEndpoints { | ||
| if s.enableEndpointSlices { | ||
| if eps, ok := s.endpointSlices[id.ResourceID]; ok { | ||
| for _, ep := range eps.Endpoints { | ||
| metadata.Addresses = append(metadata.Addresses, kubeRouteMetadataAddress{ | ||
| Address: ep.Address, | ||
| Zone: ep.Zone, | ||
| NodeName: ep.NodeName, | ||
| TargetRef: ep.TargetRef, | ||
| }) | ||
| } | ||
| } | ||
| } else { | ||
| if ep, ok := s.endpoints[id.ResourceID]; ok { | ||
| for _, subset := range ep.Subsets { | ||
| for _, addr := range subset.Addresses { | ||
| metadata.Addresses = append(metadata.Addresses, kubeRouteMetadataAddress{ | ||
| Address: addr.IP, | ||
| NodeName: addr.NodeName, | ||
| TargetRef: addr.TargetRef, | ||
| }) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return &eskip.Route{ | ||
| Id: MetadataRouteID, | ||
| Predicates: []*eskip.Predicate{{Name: predicates.FalseName}}, | ||
| BackendType: eskip.NetworkBackend, | ||
| Backend: encodeDataURI(&metadata), | ||
| } | ||
| } | ||
|
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| func decodeMetadata(r *eskip.Route) (map[string]*kubeRouteMetadataAddress, error) { | ||
| metadata, err := decodeDataURI(r.Backend) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| result := make(map[string]*kubeRouteMetadataAddress, len(metadata.Addresses)) | ||
| for i := range metadata.Addresses { | ||
| addr := &metadata.Addresses[i] | ||
| result[addr.Address] = addr | ||
| } | ||
| return result, nil | ||
| } | ||
|
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| const dataUriPrefix = "data:application/json;base64," | ||
|
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| // encodeDataURI encodes metadata into data URI. | ||
| // See https://datatracker.ietf.org/doc/html/rfc2397 | ||
| func encodeDataURI(metadata *kubeRouteMetadata) string { | ||
| data, _ := json.Marshal(&metadata) | ||
|
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| buf := make([]byte, len(dataUriPrefix)+base64.StdEncoding.EncodedLen(len(data))) | ||
|
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| copy(buf, dataUriPrefix) | ||
| base64.StdEncoding.Encode(buf[len(dataUriPrefix):], data) | ||
|
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| return string(buf) | ||
| } | ||
|
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| // encodeDataURI encodes metadata into data URI. | ||
| // See https://datatracker.ietf.org/doc/html/rfc2397 | ||
| func decodeDataURI(uri string) (*kubeRouteMetadata, error) { | ||
| var metadata kubeRouteMetadata | ||
|
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| data, err := base64.StdEncoding.DecodeString(uri[len(dataUriPrefix):]) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to decode base64: %w", err) | ||
| } | ||
|
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| if err := json.Unmarshal(data, &metadata); err != nil { | ||
| return nil, fmt.Errorf("failed to decode json: %w", err) | ||
| } | ||
| return &metadata, nil | ||
| } | ||
|
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| func (pp *metadataPreProcessor) addMetadata(metadata map[string]*kubeRouteMetadataAddress, endpoint string) { | ||
| _, host, err := snet.SchemeHost(endpoint) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
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| addr, ok := metadata[host] | ||
| if !ok { | ||
| return | ||
| } | ||
|
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| metrics := pp.options.EndpointRegistry.GetMetrics(host) | ||
| metrics.SetTag("zone", addr.Zone) | ||
| metrics.SetTag("nodeName", addr.NodeName) | ||
| if addr.TargetRef != nil && addr.TargetRef.Kind == "Pod" { | ||
| metrics.SetTag("pod", addr.TargetRef.Name) | ||
| metrics.SetTag("namespace", addr.TargetRef.Namespace) | ||
| } | ||
| } |
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