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Implement federated metric metadata API (thanos-io#3686)
* support federated metadata API Signed-off-by: Ben Ye <yb532204897@gmail.com> * update comments Signed-off-by: yeya24 <yb532204897@gmail.com> * use parseInt Signed-off-by: yeya24 <yb532204897@gmail.com> * address Prem's comments Signed-off-by: yeya24 <yb532204897@gmail.com> * update proto comment Signed-off-by: yeya24 <yb532204897@gmail.com> * add changelog Signed-off-by: yeya24 <yb532204897@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| // Copyright (c) The Thanos Authors. | ||
| // Licensed under the Apache License 2.0. | ||
|
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| package metadata | ||
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| import ( | ||
| "context" | ||
|
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| "github.com/pkg/errors" | ||
| "github.com/prometheus/prometheus/storage" | ||
| "github.com/thanos-io/thanos/pkg/metadata/metadatapb" | ||
| ) | ||
|
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| var _ UnaryClient = &GRPCClient{} | ||
|
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| // UnaryClient is gRPC metadatapb.Metadata client which expands streaming metadata API. Useful for consumers that does not | ||
| // support streaming. | ||
| type UnaryClient interface { | ||
| Metadata(ctx context.Context, req *metadatapb.MetadataRequest) (map[string][]metadatapb.Meta, storage.Warnings, error) | ||
| } | ||
|
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| // GRPCClient allows to retrieve metadata from local gRPC streaming server implementation. | ||
| // TODO(bwplotka): Switch to native gRPC transparent client->server adapter once available. | ||
| type GRPCClient struct { | ||
| proxy metadatapb.MetadataServer | ||
| } | ||
|
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| func NewGRPCClient(ts metadatapb.MetadataServer) *GRPCClient { | ||
| return &GRPCClient{ | ||
| proxy: ts, | ||
| } | ||
| } | ||
|
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| func (rr *GRPCClient) Metadata(ctx context.Context, req *metadatapb.MetadataRequest) (map[string][]metadatapb.Meta, storage.Warnings, error) { | ||
| srv := &metadataServer{ctx: ctx, metric: req.Metric, limit: int(req.Limit)} | ||
|
|
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| if req.Limit >= 0 { | ||
| if req.Metric != "" { | ||
| srv.metadataMap = make(map[string][]metadatapb.Meta, 1) | ||
| } else if req.Limit <= 100 { | ||
| srv.metadataMap = make(map[string][]metadatapb.Meta, req.Limit) | ||
| } else { | ||
| srv.metadataMap = make(map[string][]metadatapb.Meta) | ||
| } | ||
| } else { | ||
| srv.metadataMap = make(map[string][]metadatapb.Meta) | ||
| } | ||
|
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| if err := rr.proxy.Metadata(req, srv); err != nil { | ||
| return nil, nil, errors.Wrap(err, "proxy Metadata") | ||
| } | ||
|
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| return srv.metadataMap, srv.warnings, nil | ||
| } | ||
|
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| type metadataServer struct { | ||
| // This field just exist to pseudo-implement the unused methods of the interface. | ||
| metadatapb.Metadata_MetadataServer | ||
| ctx context.Context | ||
|
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| metric string | ||
| limit int | ||
|
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| warnings []error | ||
| metadataMap map[string][]metadatapb.Meta | ||
| } | ||
|
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| func (srv *metadataServer) Send(res *metadatapb.MetadataResponse) error { | ||
| if res.GetWarning() != "" { | ||
| srv.warnings = append(srv.warnings, errors.New(res.GetWarning())) | ||
| return nil | ||
| } | ||
|
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| if res.GetMetadata() == nil { | ||
| return errors.New("no metadata") | ||
| } | ||
|
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| // If limit is set to 0, we don't need to add anything. | ||
| if srv.limit == 0 { | ||
| return nil | ||
| } | ||
|
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| for k, v := range res.GetMetadata().Metadata { | ||
| if metadata, ok := srv.metadataMap[k]; !ok { | ||
| // If limit is set and it is positive, we limit the size of the map. | ||
| if srv.limit < 0 || srv.limit > 0 && len(srv.metadataMap) < srv.limit { | ||
| srv.metadataMap[k] = v.Metas | ||
| } | ||
| } else { | ||
| // There shouldn't be many metadata for one single metric. | ||
| Outer: | ||
| for _, meta := range v.Metas { | ||
| for _, m := range metadata { | ||
| if meta == m { | ||
| continue Outer | ||
| } | ||
| } | ||
| srv.metadataMap[k] = append(srv.metadataMap[k], meta) | ||
| } | ||
| } | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (srv *metadataServer) Context() context.Context { | ||
| return srv.ctx | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| // Copyright (c) The Thanos Authors. | ||
| // Licensed under the Apache License 2.0. | ||
|
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| package metadatapb | ||
|
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| import ( | ||
| "unsafe" | ||
| ) | ||
|
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| func NewMetadataResponse(metadata *MetricMetadata) *MetadataResponse { | ||
| return &MetadataResponse{ | ||
| Result: &MetadataResponse_Metadata{ | ||
| Metadata: metadata, | ||
| }, | ||
| } | ||
| } | ||
|
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| func NewWarningMetadataResponse(warning error) *MetadataResponse { | ||
| return &MetadataResponse{ | ||
| Result: &MetadataResponse_Warning{ | ||
| Warning: warning.Error(), | ||
| }, | ||
| } | ||
| } | ||
|
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| func FromMetadataMap(m map[string][]Meta) *MetricMetadata { | ||
| return &MetricMetadata{Metadata: *(*map[string]MetricMetadataEntry)(unsafe.Pointer(&m))} | ||
| } |
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