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) if strings.Contains(value, ".") { if parseInLocation { format = rFC3339NanoLocal } else { format = time.RFC3339Nano } } else if 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 } } } else if parseInLocation { format = dateLocal } else { 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 }