131 lines
3.6 KiB
Go
131 lines
3.6 KiB
Go
/*
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*
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* Copyright 2023 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package serviceconfig
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import (
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"encoding/json"
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"fmt"
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"math"
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"strconv"
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"strings"
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"time"
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)
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// Duration defines JSON marshal and unmarshal methods to conform to the
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// protobuf JSON spec defined [here].
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//
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// [here]: https://protobuf.dev/reference/protobuf/google.protobuf/#duration
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type Duration time.Duration
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func (d Duration) String() string {
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return fmt.Sprint(time.Duration(d))
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}
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// MarshalJSON converts from d to a JSON string output.
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func (d Duration) MarshalJSON() ([]byte, error) {
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ns := time.Duration(d).Nanoseconds()
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sec := ns / int64(time.Second)
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ns = ns % int64(time.Second)
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var sign string
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if sec < 0 || ns < 0 {
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sign, sec, ns = "-", -1*sec, -1*ns
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}
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// Generated output always contains 0, 3, 6, or 9 fractional digits,
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// depending on required precision.
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str := fmt.Sprintf("%s%d.%09d", sign, sec, ns)
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str = strings.TrimSuffix(str, "000")
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str = strings.TrimSuffix(str, "000")
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str = strings.TrimSuffix(str, ".000")
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return []byte(fmt.Sprintf("\"%ss\"", str)), nil
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}
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// UnmarshalJSON unmarshals b as a duration JSON string into d.
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func (d *Duration) UnmarshalJSON(b []byte) error {
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var s string
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if err := json.Unmarshal(b, &s); err != nil {
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return err
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}
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if !strings.HasSuffix(s, "s") {
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return fmt.Errorf("malformed duration %q: missing seconds unit", s)
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}
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neg := false
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if s[0] == '-' {
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neg = true
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s = s[1:]
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}
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ss := strings.SplitN(s[:len(s)-1], ".", 3)
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if len(ss) > 2 {
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return fmt.Errorf("malformed duration %q: too many decimals", s)
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}
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// hasDigits is set if either the whole or fractional part of the number is
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// present, since both are optional but one is required.
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hasDigits := false
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var sec, ns int64
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if len(ss[0]) > 0 {
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var err error
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if sec, err = strconv.ParseInt(ss[0], 10, 64); err != nil {
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return fmt.Errorf("malformed duration %q: %v", s, err)
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}
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// Maximum seconds value per the durationpb spec.
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const maxProtoSeconds = 315_576_000_000
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if sec > maxProtoSeconds {
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return fmt.Errorf("out of range: %q", s)
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}
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hasDigits = true
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}
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if len(ss) == 2 && len(ss[1]) > 0 {
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if len(ss[1]) > 9 {
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return fmt.Errorf("malformed duration %q: too many digits after decimal", s)
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}
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var err error
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if ns, err = strconv.ParseInt(ss[1], 10, 64); err != nil {
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return fmt.Errorf("malformed duration %q: %v", s, err)
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}
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for i := 9; i > len(ss[1]); i-- {
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ns *= 10
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}
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hasDigits = true
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}
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if !hasDigits {
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return fmt.Errorf("malformed duration %q: contains no numbers", s)
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}
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if neg {
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sec *= -1
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ns *= -1
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}
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// Maximum/minimum seconds/nanoseconds representable by Go's time.Duration.
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const maxSeconds = math.MaxInt64 / int64(time.Second)
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const maxNanosAtMaxSeconds = math.MaxInt64 % int64(time.Second)
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const minSeconds = math.MinInt64 / int64(time.Second)
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const minNanosAtMinSeconds = math.MinInt64 % int64(time.Second)
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if sec > maxSeconds || (sec == maxSeconds && ns >= maxNanosAtMaxSeconds) {
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*d = Duration(math.MaxInt64)
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} else if sec < minSeconds || (sec == minSeconds && ns <= minNanosAtMinSeconds) {
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*d = Duration(math.MinInt64)
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} else {
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*d = Duration(sec*int64(time.Second) + ns)
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}
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return nil
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}
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