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package timetype
// code adapted from https://github.com/moby/moby/blob/master/api/types/time/timestamp.go
import (
"fmt"
"math"
"strconv"
"strings"
"time"
)
// These are additional predefined layouts for use in Time.Format and Time.Parse
// with --since and --until parameters for `docker logs` and `docker events`
const (
rFC3339Local = "2006-01-02T15:04:05" // RFC3339 with local timezone
rFC3339NanoLocal = "2006-01-02T15:04:05.999999999" // RFC3339Nano with local timezone
dateWithZone = "2006-01-02Z07:00" // RFC3339 with time at 00:00:00
dateLocal = "2006-01-02" // RFC3339 with local timezone and time at 00:00:00
)
// GetTimestamp tries to parse given string as golang duration,
// then RFC3339 time and finally as a Unix timestamp. If
// any of these were successful, it returns a Unix timestamp
// as string otherwise returns the given value back.
// In case of duration input, the returned timestamp is computed
// as the given reference time minus the amount of the duration.
func GetTimestamp(value string, reference time.Time) (string, error) {
if d, err := time.ParseDuration(value); value != "0" && err == nil {
return strconv.FormatInt(reference.Add(-d).Unix(), 10), nil
}
var format string
// if the string has a Z or a + or three dashes use parse otherwise use parseinlocation
parseInLocation := !(strings.ContainsAny(value, "zZ+") || strings.Count(value, "-") == 3)
switch {
case strings.Contains(value, "."):
if parseInLocation {
format = rFC3339NanoLocal
} else {
format = time.RFC3339Nano
}
case strings.Contains(value, "T"):
// we want the number of colons in the T portion of the timestamp
tcolons := strings.Count(value, ":")
// if parseInLocation is off and we have a +/- zone offset (not Z) then
// there will be an extra colon in the input for the tz offset subtract that
// colon from the tcolons count
if !parseInLocation && !strings.ContainsAny(value, "zZ") && tcolons > 0 {
tcolons--
}
if parseInLocation {
switch tcolons {
case 0:
format = "2006-01-02T15"
case 1:
format = "2006-01-02T15:04"
default:
format = rFC3339Local
}
} else {
switch tcolons {
case 0:
format = "2006-01-02T15Z07:00"
case 1:
format = "2006-01-02T15:04Z07:00"
default:
format = time.RFC3339
}
}
case parseInLocation:
format = dateLocal
default:
format = dateWithZone
}
var t time.Time
var err error
if parseInLocation {
t, err = time.ParseInLocation(format, value, time.FixedZone(reference.Zone()))
} else {
t, err = time.Parse(format, value)
}
if err != nil {
// if there is a `-` then it's an RFC3339 like timestamp
if strings.Contains(value, "-") {
return "", err // was probably an RFC3339 like timestamp but the parser failed with an error
}
if _, _, err := parseTimestamp(value); err != nil {
return "", fmt.Errorf("failed to parse value as time or duration: %q", value)
}
return value, nil // unix timestamp in and out case (meaning: the value passed at the command line is already in the right format for passing to the server)
}
return fmt.Sprintf("%d.%09d", t.Unix(), int64(t.Nanosecond())), nil
}
// ParseTimestamps returns seconds and nanoseconds from a timestamp that has the
// format "%d.%09d", time.Unix(), int64(time.Nanosecond()))
// if the incoming nanosecond portion is longer or shorter than 9 digits it is
// converted to nanoseconds. The expectation is that the seconds and
// seconds will be used to create a time variable. For example:
// seconds, nanoseconds, err := ParseTimestamp("1136073600.000000001",0)
// if err == nil since := time.Unix(seconds, nanoseconds)
// returns seconds as def(aultSeconds) if value == ""
func ParseTimestamps(value string, def int64) (int64, int64, error) {
if value == "" {
return def, 0, nil
}
return parseTimestamp(value)
}
func parseTimestamp(value string) (int64, int64, error) {
sa := strings.SplitN(value, ".", 2)
s, err := strconv.ParseInt(sa[0], 10, 64)
if err != nil {
return s, 0, err
}
if len(sa) != 2 {
return s, 0, nil
}
n, err := strconv.ParseInt(sa[1], 10, 64)
if err != nil {
return s, n, err
}
// should already be in nanoseconds but just in case convert n to nanoseconds
n = int64(float64(n) * math.Pow(float64(10), float64(9-len(sa[1]))))
return s, n, nil
}
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