github.com/m3db/m3@v1.5.0/src/query/graphite/ts/consolidation_approach.go (about)

     1  // Copyright (c) 2019 Uber Technologies, Inc.
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    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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    19  // THE SOFTWARE.
    20  
    21  package ts
    22  
    23  import (
    24  	"fmt"
    25  )
    26  
    27  // ConsolidationApproach defines an approach to consolidating multiple datapoints
    28  type ConsolidationApproach string
    29  
    30  // The standard set of consolidation functions
    31  const (
    32  	ConsolidationAvg     ConsolidationApproach = "avg"
    33  	ConsolidationMin     ConsolidationApproach = "min"
    34  	ConsolidationMax     ConsolidationApproach = "max"
    35  	ConsolidationSum     ConsolidationApproach = "sum"
    36  	ConsolidationAverage ConsolidationApproach = "average" // just an alias to avg but for backward-compatibility
    37  	ConsolidationLast    ConsolidationApproach = "last"
    38  )
    39  
    40  // SafeFunc returns a boolean indicating whether this is a valid consolidation approach,
    41  // and if so, the corresponding ConsolidationFunc.
    42  func (ca ConsolidationApproach) SafeFunc() (ConsolidationFunc, bool) {
    43  	f, ok := consolidationFuncs[ca]
    44  	return f, ok
    45  }
    46  
    47  // Func returns the ConsolidationFunc implementing the ConsolidationApproach
    48  func (ca ConsolidationApproach) Func() ConsolidationFunc {
    49  	f, ok := ca.SafeFunc()
    50  	if !ok {
    51  		panic(fmt.Sprintf("No consolidation func for %s", ca))
    52  	}
    53  
    54  	return f
    55  }
    56  
    57  var (
    58  	consolidationFuncs = map[ConsolidationApproach]ConsolidationFunc{
    59  		ConsolidationAvg:     Avg,
    60  		ConsolidationAverage: Avg,
    61  		ConsolidationMin:     Min,
    62  		ConsolidationMax:     Max,
    63  		ConsolidationSum:     Sum,
    64  		ConsolidationLast:    Last,
    65  	}
    66  )