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duration.go
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duration.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package configutil
import (
"fmt"
"strconv"
"strings"
"time"
"unicode"
)
var durationUnitMap = map[string]time.Duration{
"us": time.Microsecond,
"ms": time.Millisecond,
"s": time.Second,
"m": time.Minute,
}
var allSuffixes = []string{"us", "ms", "s", "m"}
// DurationOptions can be used to specify the minimum accepted duration unit
// for ParseDurationOptions.
type DurationOptions struct {
MinimumDurationUnit time.Duration
}
// ParseDuration parses s as a duration, accepting a subset
// of the syntax supported by time.ParseDuration.
//
// Valid time units are "ms", "s", "m".
func ParseDuration(s string) (time.Duration, error) {
return ParseDurationOptions(s, DurationOptions{
MinimumDurationUnit: time.Millisecond,
})
}
// ParseDurationOptions parses s as a duration, accepting a subset of the
// syntax supported by time.ParseDuration. It allows a DurationOptions to
// be passed to specify the minimum time.Duration unit allowed.
//
// Valid time units are "us", "ms", "s", "m".
func ParseDurationOptions(s string, opts DurationOptions) (time.Duration, error) {
orig := s
mul := time.Nanosecond
if strings.HasPrefix(s, "-") {
mul = -1
s = s[1:]
}
sep := -1
for i, c := range s {
if sep == -1 {
if c < '0' || c > '9' {
sep = i
break
}
}
}
allowedUnitsString := computeAllowedUnitsString(opts.MinimumDurationUnit)
if sep == -1 {
return 0, fmt.Errorf("missing unit in duration %s (allowed units: %s)",
orig, allowedUnitsString,
)
}
n, err := strconv.ParseInt(s[:sep], 10, 32)
if err != nil {
return 0, fmt.Errorf("invalid duration %s", orig)
}
mul, ok := durationUnitMap[s[sep:]]
if ok {
if mul < opts.MinimumDurationUnit {
return 0, fmt.Errorf("invalid unit in duration %s (allowed units: %s)",
orig, allowedUnitsString,
)
}
return mul * time.Duration(n), nil
}
for _, c := range s[sep:] {
if unicode.IsSpace(c) {
return 0, fmt.Errorf("invalid character %q in duration %s", c, orig)
}
}
return 0, fmt.Errorf("invalid unit in duration %s (allowed units: %s)",
orig, allowedUnitsString,
)
}
func computeAllowedUnitsString(minUnit time.Duration) string {
for i, d := range allSuffixes {
if minUnit == durationUnitMap[d] {
return strings.Join(allSuffixes[i:], ", ")
}
}
return strings.Join(allSuffixes, ", ")
}