Cache labels and series results #3315
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| // Copyright (c) The Thanos Authors. | ||
| // Licensed under the Apache License 2.0. | ||
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| package queryfrontend | ||
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| import ( | ||
| "unsafe" | ||
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| "github.com/cortexproject/cortex/pkg/querier/queryrange" | ||
| ) | ||
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| // ThanosResponseExtractor helps extracting specific info from Query Response. | ||
| type ThanosResponseExtractor struct{} | ||
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| // Extract extracts response for specific a range from a response. | ||
| // This interface is not used for labels and series responses. | ||
| func (ThanosResponseExtractor) Extract(_, _ int64, resp queryrange.Response) queryrange.Response { | ||
| return resp | ||
| } | ||
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| // ResponseWithoutHeaders returns the response without HTTP headers. | ||
| func (ThanosResponseExtractor) ResponseWithoutHeaders(resp queryrange.Response) queryrange.Response { | ||
| switch tr := resp.(type) { | ||
| case *ThanosLabelsResponse: | ||
| return &ThanosLabelsResponse{Status: queryrange.StatusSuccess, Data: tr.Data} | ||
| case *ThanosSeriesResponse: | ||
| return &ThanosSeriesResponse{Status: queryrange.StatusSuccess, Data: tr.Data} | ||
| } | ||
| return resp | ||
| } | ||
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| // headersToQueryRangeHeaders convert slice of ResponseHeader to Cortex queryrange.PrometheusResponseHeader in an | ||
| // unsafe manner. It reuses the same memory. | ||
| func headersToQueryRangeHeaders(headers []*ResponseHeader) []*queryrange.PrometheusResponseHeader { | ||
| return *(*[]*queryrange.PrometheusResponseHeader)(unsafe.Pointer(&headers)) | ||
| } | ||
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| // GetHeaders returns the HTTP headers in the response. | ||
| func (m *ThanosLabelsResponse) GetHeaders() []*queryrange.PrometheusResponseHeader { | ||
| return headersToQueryRangeHeaders(m.Headers) | ||
| } | ||
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| // GetHeaders returns the HTTP headers in the response. | ||
| func (m *ThanosSeriesResponse) GetHeaders() []*queryrange.PrometheusResponseHeader { | ||
| return headersToQueryRangeHeaders(m.Headers) | ||
| } |
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What about label names?
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ThanosLabelsRequestalready covers bothlabel_valuesquery andlabel_namesquery. If it is alabel_namesquery, thentr.Labelis just an empty string. Forlabel_valuesquery, that's the queried label name.I am using the same struct for them since their query response is the same []string