1 // Copyright 2016 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package ptypes 6 7 import ( 8 "errors" 9 "fmt" 10 "time" 11 12 timestamppb "github.com/golang/protobuf/ptypes/timestamp" 13 ) 14 15 // Range of google.protobuf.Duration as specified in timestamp.proto. 16 const ( 17 // Seconds field of the earliest valid Timestamp. 18 // This is time.Date(1, 1, 1, 0, 0, 0, 0, time.UTC).Unix(). 19 minValidSeconds = -62135596800 20 // Seconds field just after the latest valid Timestamp. 21 // This is time.Date(10000, 1, 1, 0, 0, 0, 0, time.UTC).Unix(). 22 maxValidSeconds = 253402300800 23 ) 24 25 // Timestamp converts a timestamppb.Timestamp to a time.Time. 26 // It returns an error if the argument is invalid. 27 // 28 // Unlike most Go functions, if Timestamp returns an error, the first return 29 // value is not the zero time.Time. Instead, it is the value obtained from the 30 // time.Unix function when passed the contents of the Timestamp, in the UTC 31 // locale. This may or may not be a meaningful time; many invalid Timestamps 32 // do map to valid time.Times. 33 // 34 // A nil Timestamp returns an error. The first return value in that case is 35 // undefined. 36 // 37 // Deprecated: Call the ts.AsTime and ts.CheckValid methods instead. 38 func Timestamp(ts *timestamppb.Timestamp) (time.Time, error) { 39 // Don't return the zero value on error, because corresponds to a valid 40 // timestamp. Instead return whatever time.Unix gives us. 41 var t time.Time 42 if ts == nil { 43 t = time.Unix(0, 0).UTC() // treat nil like the empty Timestamp 44 } else { 45 t = time.Unix(ts.Seconds, int64(ts.Nanos)).UTC() 46 } 47 return t, validateTimestamp(ts) 48 } 49 50 // TimestampNow returns a google.protobuf.Timestamp for the current time. 51 // 52 // Deprecated: Call the timestamppb.Now function instead. 53 func TimestampNow() *timestamppb.Timestamp { 54 ts, err := TimestampProto(time.Now()) 55 if err != nil { 56 panic("ptypes: time.Now() out of Timestamp range") 57 } 58 return ts 59 } 60 61 // TimestampProto converts the time.Time to a google.protobuf.Timestamp proto. 62 // It returns an error if the resulting Timestamp is invalid. 63 // 64 // Deprecated: Call the timestamppb.New function instead. 65 func TimestampProto(t time.Time) (*timestamppb.Timestamp, error) { 66 ts := ×tamppb.Timestamp{ 67 Seconds: t.Unix(), 68 Nanos: int32(t.Nanosecond()), 69 } 70 if err := validateTimestamp(ts); err != nil { 71 return nil, err 72 } 73 return ts, nil 74 } 75 76 // TimestampString returns the RFC 3339 string for valid Timestamps. 77 // For invalid Timestamps, it returns an error message in parentheses. 78 // 79 // Deprecated: Call the ts.AsTime method instead, 80 // followed by a call to the Format method on the time.Time value. 81 func TimestampString(ts *timestamppb.Timestamp) string { 82 t, err := Timestamp(ts) 83 if err != nil { 84 return fmt.Sprintf("(%v)", err) 85 } 86 return t.Format(time.RFC3339Nano) 87 } 88 89 // validateTimestamp determines whether a Timestamp is valid. 90 // A valid timestamp represents a time in the range [0001-01-01, 10000-01-01) 91 // and has a Nanos field in the range [0, 1e9). 92 // 93 // If the Timestamp is valid, validateTimestamp returns nil. 94 // Otherwise, it returns an error that describes the problem. 95 // 96 // Every valid Timestamp can be represented by a time.Time, 97 // but the converse is not true. 98 func validateTimestamp(ts *timestamppb.Timestamp) error { 99 if ts == nil { 100 return errors.New("timestamp: nil Timestamp") 101 } 102 if ts.Seconds < minValidSeconds { 103 return fmt.Errorf("timestamp: %v before 0001-01-01", ts) 104 } 105 if ts.Seconds >= maxValidSeconds { 106 return fmt.Errorf("timestamp: %v after 10000-01-01", ts) 107 } 108 if ts.Nanos < 0 || ts.Nanos >= 1e9 { 109 return fmt.Errorf("timestamp: %v: nanos not in range [0, 1e9)", ts) 110 } 111 return nil 112 } 113