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