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 ptypes 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 durpb "github.com/golang/protobuf/ptypes/duration" 43 ) 44 45 const ( 46 // Range of a durpb.Duration in seconds, as specified in 47 // google/protobuf/duration.proto. This is about 10,000 years in seconds. 48 maxSeconds = int64(10000 * 365.25 * 24 * 60 * 60) 49 minSeconds = -maxSeconds 50 ) 51 52 // validateDuration determines whether the durpb.Duration is valid according to the 53 // definition in google/protobuf/duration.proto. A valid durpb.Duration 54 // may still be too large to fit into a time.Duration (the range of durpb.Duration 55 // is about 10,000 years, and the range of time.Duration is about 290). 56 func validateDuration(d *durpb.Duration) error { 57 if d == nil { 58 return errors.New("duration: nil Duration") 59 } 60 if d.Seconds < minSeconds || d.Seconds > maxSeconds { 61 return fmt.Errorf("duration: %v: seconds out of range", d) 62 } 63 if d.Nanos <= -1e9 || d.Nanos >= 1e9 { 64 return fmt.Errorf("duration: %v: nanos out of range", d) 65 } 66 // Seconds and Nanos must have the same sign, unless d.Nanos is zero. 67 if (d.Seconds < 0 && d.Nanos > 0) || (d.Seconds > 0 && d.Nanos < 0) { 68 return fmt.Errorf("duration: %v: seconds and nanos have different signs", d) 69 } 70 return nil 71 } 72 73 // Duration converts a durpb.Duration to a time.Duration. Duration 74 // returns an error if the durpb.Duration is invalid or is too large to be 75 // represented in a time.Duration. 76 func Duration(p *durpb.Duration) (time.Duration, error) { 77 if err := validateDuration(p); err != nil { 78 return 0, err 79 } 80 d := time.Duration(p.Seconds) * time.Second 81 if int64(d/time.Second) != p.Seconds { 82 return 0, fmt.Errorf("duration: %v is out of range for time.Duration", p) 83 } 84 if p.Nanos != 0 { 85 d += time.Duration(p.Nanos) 86 if (d < 0) != (p.Nanos < 0) { 87 return 0, fmt.Errorf("duration: %v is out of range for time.Duration", p) 88 } 89 } 90 return d, nil 91 } 92 93 // DurationProto converts a time.Duration to a durpb.Duration. 94 func DurationProto(d time.Duration) *durpb.Duration { 95 nanos := d.Nanoseconds() 96 secs := nanos / 1e9 97 nanos -= secs * 1e9 98 return &durpb.Duration{ 99 Seconds: secs, 100 Nanos: int32(nanos), 101 } 102 } 103
