mirror of
https://github.com/miniflux/v2.git
synced 2024-08-29 23:57:21 +02:00
135 lines
4.8 KiB
Go
135 lines
4.8 KiB
Go
|
// 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)
|
||
|
}
|