github.com/thanos-io/thanos@v0.32.5/pkg/queryfrontend/cache.go (about)

     1  // Copyright (c) The Thanos Authors.
     2  // Licensed under the Apache License 2.0.
     3  
     4  package queryfrontend
     5  
     6  import (
     7  	"fmt"
     8  
     9  	"github.com/thanos-io/thanos/internal/cortex/querier/queryrange"
    10  	"github.com/thanos-io/thanos/pkg/compact/downsample"
    11  )
    12  
    13  // thanosCacheKeyGenerator is a utility for using split interval when determining cache keys.
    14  type thanosCacheKeyGenerator struct {
    15  	interval    queryrange.IntervalFn
    16  	resolutions []int64
    17  }
    18  
    19  func newThanosCacheKeyGenerator(intervalFn queryrange.IntervalFn) thanosCacheKeyGenerator {
    20  	return thanosCacheKeyGenerator{
    21  		interval:    intervalFn,
    22  		resolutions: []int64{downsample.ResLevel2, downsample.ResLevel1, downsample.ResLevel0},
    23  	}
    24  }
    25  
    26  // GenerateCacheKey generates a cache key based on the Request and interval.
    27  // TODO(yeya24): Add other request params as request key.
    28  func (t thanosCacheKeyGenerator) GenerateCacheKey(userID string, r queryrange.Request) string {
    29  	currentInterval := r.GetStart() / t.interval(r).Milliseconds()
    30  	switch tr := r.(type) {
    31  	case *ThanosQueryRangeRequest:
    32  		i := 0
    33  		for ; i < len(t.resolutions) && t.resolutions[i] > tr.MaxSourceResolution; i++ {
    34  		}
    35  		shardInfoKey := generateShardInfoKey(tr)
    36  		return fmt.Sprintf("fe:%s:%s:%d:%d:%d:%s:%d:%s", userID, tr.Query, tr.Step, currentInterval, i, shardInfoKey, tr.LookbackDelta, tr.Engine)
    37  	case *ThanosLabelsRequest:
    38  		return fmt.Sprintf("fe:%s:%s:%s:%d", userID, tr.Label, tr.Matchers, currentInterval)
    39  	case *ThanosSeriesRequest:
    40  		return fmt.Sprintf("fe:%s:%s:%d", userID, tr.Matchers, currentInterval)
    41  	}
    42  	return fmt.Sprintf("fe:%s:%s:%d:%d", userID, r.GetQuery(), r.GetStep(), currentInterval)
    43  }
    44  
    45  func generateShardInfoKey(r *ThanosQueryRangeRequest) string {
    46  	if r.ShardInfo == nil {
    47  		return "-"
    48  	}
    49  	return fmt.Sprintf("%d:%d", r.ShardInfo.TotalShards, r.ShardInfo.ShardIndex)
    50  }