| // Go support for Protocol Buffers - Google's data interchange format |
| // |
| // Copyright 2016 The Go Authors. All rights reserved. |
| // https://github.com/golang/protobuf |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| package ptypes |
| |
| // This file implements operations on google.protobuf.Timestamp. |
| |
| import ( |
| "errors" |
| "fmt" |
| "time" |
| |
| tspb "github.com/golang/protobuf/ptypes/timestamp" |
| ) |
| |
| const ( |
| // Seconds field of the earliest valid Timestamp. |
| // This is time.Date(1, 1, 1, 0, 0, 0, 0, time.UTC).Unix(). |
| minValidSeconds = -62135596800 |
| // Seconds field just after the latest valid Timestamp. |
| // This is time.Date(10000, 1, 1, 0, 0, 0, 0, time.UTC).Unix(). |
| maxValidSeconds = 253402300800 |
| ) |
| |
| // validateTimestamp determines whether a Timestamp is valid. |
| // A valid timestamp represents a time in the range |
| // [0001-01-01, 10000-01-01) and has a Nanos field |
| // in the range [0, 1e9). |
| // |
| // If the Timestamp is valid, validateTimestamp returns nil. |
| // Otherwise, it returns an error that describes |
| // the problem. |
| // |
| // Every valid Timestamp can be represented by a time.Time, but the converse is not true. |
| func validateTimestamp(ts *tspb.Timestamp) error { |
| if ts == nil { |
| return errors.New("timestamp: nil Timestamp") |
| } |
| if ts.Seconds < minValidSeconds { |
| return fmt.Errorf("timestamp: %v before 0001-01-01", ts) |
| } |
| if ts.Seconds >= maxValidSeconds { |
| return fmt.Errorf("timestamp: %v after 10000-01-01", ts) |
| } |
| if ts.Nanos < 0 || ts.Nanos >= 1e9 { |
| return fmt.Errorf("timestamp: %v: nanos not in range [0, 1e9)", ts) |
| } |
| return nil |
| } |
| |
| // Timestamp converts a google.protobuf.Timestamp proto to a time.Time. |
| // It returns an error if the argument is invalid. |
| // |
| // Unlike most Go functions, if Timestamp returns an error, the first return value |
| // is not the zero time.Time. Instead, it is the value obtained from the |
| // time.Unix function when passed the contents of the Timestamp, in the UTC |
| // locale. This may or may not be a meaningful time; many invalid Timestamps |
| // do map to valid time.Times. |
| // |
| // A nil Timestamp returns an error. The first return value in that case is |
| // undefined. |
| func Timestamp(ts *tspb.Timestamp) (time.Time, error) { |
| // Don't return the zero value on error, because corresponds to a valid |
| // timestamp. Instead return whatever time.Unix gives us. |
| var t time.Time |
| if ts == nil { |
| t = time.Unix(0, 0).UTC() // treat nil like the empty Timestamp |
| } else { |
| t = time.Unix(ts.Seconds, int64(ts.Nanos)).UTC() |
| } |
| return t, validateTimestamp(ts) |
| } |
| |
| // TimestampNow returns a google.protobuf.Timestamp for the current time. |
| func TimestampNow() *tspb.Timestamp { |
| ts, err := TimestampProto(time.Now()) |
| if err != nil { |
| panic("ptypes: time.Now() out of Timestamp range") |
| } |
| return ts |
| } |
| |
| // TimestampProto converts the time.Time to a google.protobuf.Timestamp proto. |
| // It returns an error if the resulting Timestamp is invalid. |
| func TimestampProto(t time.Time) (*tspb.Timestamp, error) { |
| seconds := t.Unix() |
| nanos := int32(t.Sub(time.Unix(seconds, 0))) |
| ts := &tspb.Timestamp{ |
| Seconds: seconds, |
| Nanos: nanos, |
| } |
| if err := validateTimestamp(ts); err != nil { |
| return nil, err |
| } |
| return ts, nil |
| } |
| |
| // TimestampString returns the RFC 3339 string for valid Timestamps. For invalid |
| // Timestamps, it returns an error message in parentheses. |
| func TimestampString(ts *tspb.Timestamp) string { |
| t, err := Timestamp(ts) |
| if err != nil { |
| return fmt.Sprintf("(%v)", err) |
| } |
| return t.Format(time.RFC3339Nano) |
| } |