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Add gRPC render metadata header #538

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Add gRPC render metadata header #538

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13 changes: 13 additions & 0 deletions carbonserver/render.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ import (

"go.uber.org/zap"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/status"

Expand Down Expand Up @@ -646,6 +647,13 @@ func (listener *CarbonserverListener) streamMetrics(stream grpcv2.CarbonV2_Rende
return
}

const gRPCRenderMetricsCountHeaderKey = "metrics-count"

func sendRenderMetadataHeader(stream grpcv2.CarbonV2_RenderServer, filesCount int) error {
header := metadata.Pairs(gRPCRenderMetricsCountHeaderKey, strconv.Itoa(filesCount))
return stream.SendHeader(header)
}

// Render implements Render rpc of CarbonV2 gRPC service
func (listener *CarbonserverListener) Render(req *protov2.MultiFetchRequest, stream grpcv2.CarbonV2_RenderServer) (rpcErr error) {
t0 := time.Now()
Expand Down Expand Up @@ -726,6 +734,10 @@ func (listener *CarbonserverListener) Render(req *protov2.MultiFetchRequest, str
metricGlobMap := getMetricGlobMapFromExpandedGlobs(expandedGlobs)
tle.MetricGlobMapLength = len(metricGlobMap)
filesCount := countFilesInExpandedGlobs(expandedGlobs)
err = sendRenderMetadataHeader(stream, filesCount)
if err != nil {
return nil, err
}
prepareChan := make(chan response, getStreamingChannelSize(filesCount))
go func() {
prepareT0 := time.Now()
Expand Down Expand Up @@ -768,6 +780,7 @@ func (listener *CarbonserverListener) Render(req *protov2.MultiFetchRequest, str
case res != nil:
atomic.AddUint64(&listener.metrics.QueryCacheHit, 1)
cachedResponses := res.([]response)
err = sendRenderMetadataHeader(stream, len(cachedResponses))
responseChanToStream = make(chan response, getStreamingChannelSize(len(cachedResponses)))
go func() {
for _, r := range cachedResponses {
Expand Down