1 // Go support for Protocol Buffers - Google's data interchange format 2 // 3 // Copyright 2016 The Go Authors. All rights reserved. 4 // https://github.com/golang/protobuf 5 // 6 // Redistribution and use in source and binary forms, with or without 7 // modification, are permitted provided that the following conditions are 8 // met: 9 // 10 // * Redistributions of source code must retain the above copyright 11 // notice, this list of conditions and the following disclaimer. 12 // * Redistributions in binary form must reproduce the above 13 // copyright notice, this list of conditions and the following disclaimer 14 // in the documentation and/or other materials provided with the 15 // distribution. 16 // * Neither the name of Google Inc. nor the names of its 17 // contributors may be used to endorse or promote products derived from 18 // this software without specific prior written permission. 19 // 20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 32 package types 33 34 // This file implements conversions between google.protobuf.Duration 35 // and time.Duration. 36 37 import ( 38 "errors" 39 "fmt" 40 "time" 41 ) 42 43 const ( 44 // Range of a Duration in seconds, as specified in 45 // google/protobuf/duration.proto. This is about 10,000 years in seconds. 46 maxSeconds = int64(10000 * 365.25 * 24 * 60 * 60) 47 minSeconds = -maxSeconds 48 ) 49 50 // validateDuration determines whether the Duration is valid according to the 51 // definition in google/protobuf/duration.proto. A valid Duration 52 // may still be too large to fit into a time.Duration (the range of Duration 53 // is about 10,000 years, and the range of time.Duration is about 290). 54 func validateDuration(d *Duration) error { 55 if d == nil { 56 return errors.New("duration: nil Duration") 57 } 58 if d.Seconds < minSeconds || d.Seconds > maxSeconds { 59 return fmt.Errorf("duration: %#v: seconds out of range", d) 60 } 61 if d.Nanos <= -1e9 || d.Nanos >= 1e9 { 62 return fmt.Errorf("duration: %#v: nanos out of range", d) 63 } 64 // Seconds and Nanos must have the same sign, unless d.Nanos is zero. 65 if (d.Seconds < 0 && d.Nanos > 0) || (d.Seconds > 0 && d.Nanos < 0) { 66 return fmt.Errorf("duration: %#v: seconds and nanos have different signs", d) 67 } 68 return nil 69 } 70 71 // DurationFromProto converts a Duration to a time.Duration. DurationFromProto 72 // returns an error if the Duration is invalid or is too large to be 73 // represented in a time.Duration. 74 func DurationFromProto(p *Duration) (time.Duration, error) { 75 if err := validateDuration(p); err != nil { 76 return 0, err 77 } 78 d := time.Duration(p.Seconds) * time.Second 79 if int64(d/time.Second) != p.Seconds { 80 return 0, fmt.Errorf("duration: %#v is out of range for time.Duration", p) 81 } 82 if p.Nanos != 0 { 83 d += time.Duration(p.Nanos) * time.Nanosecond 84 if (d < 0) != (p.Nanos < 0) { 85 return 0, fmt.Errorf("duration: %#v is out of range for time.Duration", p) 86 } 87 } 88 return d, nil 89 } 90 91 // DurationProto converts a time.Duration to a Duration. 92 func DurationProto(d time.Duration) *Duration { 93 nanos := d.Nanoseconds() 94 secs := nanos / 1e9 95 nanos -= secs * 1e9 96 return &Duration{ 97 Seconds: secs, 98 Nanos: int32(nanos), 99 } 100 } 101