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Merge pull request #1231 from jamessanford/clamp_function

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promql: Add clamp function.
This commit is contained in:
Brian Brazil 2015-11-27 00:05:34 +00:00
parent de21676667 5b53262b7a
commit aa5b35ed94
2 changed files with 57 additions and 0 deletions
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34
promql/functions.go
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@ -228,6 +228,28 @@ func funcBottomk(ev *evaluator, args Expressions) model.Value {
return vector(bottomk)
}
// === clamp_max(vector model.ValVector, max Scalar) Vector ===
func funcClampMax(ev *evaluator, args Expressions) model.Value {
vec := ev.evalVector(args[0])
max := ev.evalFloat(args[1])
for _, el := range vec {
el.Metric.Del(model.MetricNameLabel)
el.Value = model.SampleValue(math.Min(max, float64(el.Value)))
}
return vec
}
// === clamp_min(vector model.ValVector, min Scalar) Vector ===
func funcClampMin(ev *evaluator, args Expressions) model.Value {
vec := ev.evalVector(args[0])
min := ev.evalFloat(args[1])
for _, el := range vec {
el.Metric.Del(model.MetricNameLabel)
el.Value = model.SampleValue(math.Max(min, float64(el.Value)))
}
return vec
}
// === drop_common_labels(node model.ValVector) Vector ===
func funcDropCommonLabels(ev *evaluator, args Expressions) model.Value {
vec := ev.evalVector(args[0])
@ -751,6 +773,18 @@ var functions = map[string]*Function{
ReturnType: model.ValVector,
Call: funcChanges,
},
"clamp_max": {
Name: "clamp_max",
ArgTypes: []model.ValueType{model.ValVector, model.ValScalar},
ReturnType: model.ValVector,
Call: funcClampMax,
},
"clamp_min": {
Name: "clamp_min",
ArgTypes: []model.ValueType{model.ValVector, model.ValScalar},
ReturnType: model.ValVector,
Call: funcClampMin,
},
"count_over_time": {
Name: "count_over_time",
ArgTypes: []model.ValueType{model.ValMatrix},

23
promql/testdata/functions.test vendored
View file

@ -170,3 +170,26 @@ eval instant at 0m vector(1)
eval instant at 60m vector(time())
{} 3600
clear
# Tests for clamp_max and clamp_min().
load 5m
test_clamp{src="clamp-a"} -50
test_clamp{src="clamp-b"} 0
test_clamp{src="clamp-c"} 100
eval instant at 0m clamp_max(test_clamp, 75)
{src="clamp-a"} -50
{src="clamp-b"} 0
{src="clamp-c"} 75
eval instant at 0m clamp_min(test_clamp, -25)
{src="clamp-a"} -25
{src="clamp-b"} 0
{src="clamp-c"} 100
eval instant at 0m clamp_max(clamp_min(test_clamp, -20), 70)
{src="clamp-a"} -20
{src="clamp-b"} 0
{src="clamp-c"} 70