gomonop/pkg/perfdata/range.go

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package perfdata // import nocternity.net/gomonop/pkg/perfdata
import (
"fmt"
"strconv"
)
// Performance data range.
type Range struct {
start string
end string
inside bool
}
// Creates a performance data range from -inf to 0 and from the specified
// value to +inf.
func RangeMax(max string) *Range {
if !valueCheck.MatchString(max) {
panic("invalid performance data range maximum value")
}
pdRange := &Range{}
pdRange.start = "0"
pdRange.end = max
return pdRange
}
// Creates a performance data range from -inf to the specified minimal value
// and from the specified maximal value to +inf.
func RangeMinMax(min, max string) *Range {
if !valueCheck.MatchString(max) {
panic("invalid performance data range maximum value")
}
if !rangeMinCheck.MatchString(min) {
panic("invalid performance data range minimum value")
}
pdRange := &Range{}
if min == "~" {
min = ""
}
pdRange.start = min
pdRange.end = max
return pdRange
}
// Inverts the range.
func (r *Range) Inside() *Range {
r.inside = true
return r
}
// Generates the range's string representation so it can be sent to the
// monitoring system.
func (r *Range) String() string {
var start, inside string
switch r.start {
case "":
start = "~"
case "0":
start = ""
default:
start = r.start
}
if r.inside {
inside = "@"
}
return inside + start + ":" + r.end
}
// Contains checks whether a numeric value is within the range.
func (r *Range) Contains(value float64) bool {
var inStart, inEnd bool
if r.start != "" {
startValue, err := strconv.ParseFloat(r.start, 64)
if err != nil {
panic(fmt.Sprintf("invalid performance data range start value: %v", err))
}
inStart = value < startValue
}
if r.end != "" {
endValue, err := strconv.ParseFloat(r.end, 64)
if err != nil {
panic(fmt.Sprintf("invalid performance data range end value: %v", err))
}
inEnd = value > endValue
}
return (inStart || inEnd) != r.inside
}