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134 lines
3.4 KiB
Go
134 lines
3.4 KiB
Go
package protocol
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import (
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"bytes"
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"fmt"
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"math"
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"strconv"
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"time"
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"github.com/aws/aws-sdk-go/internal/sdkmath"
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)
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// Names of time formats supported by the SDK
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const (
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RFC822TimeFormatName = "rfc822"
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ISO8601TimeFormatName = "iso8601"
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UnixTimeFormatName = "unixTimestamp"
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)
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// Time formats supported by the SDK
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// Output time is intended to not contain decimals
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const (
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// RFC 7231#section-7.1.1.1 timetamp format. e.g Tue, 29 Apr 2014 18:30:38 GMT
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RFC822TimeFormat = "Mon, 2 Jan 2006 15:04:05 GMT"
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rfc822TimeFormatSingleDigitDay = "Mon, _2 Jan 2006 15:04:05 GMT"
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rfc822TimeFormatSingleDigitDayTwoDigitYear = "Mon, _2 Jan 06 15:04:05 GMT"
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// This format is used for output time without seconds precision
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RFC822OutputTimeFormat = "Mon, 02 Jan 2006 15:04:05 GMT"
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// RFC3339 a subset of the ISO8601 timestamp format. e.g 2014-04-29T18:30:38Z
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ISO8601TimeFormat = "2006-01-02T15:04:05.999999999Z"
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iso8601TimeFormatNoZ = "2006-01-02T15:04:05.999999999"
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// This format is used for output time with fractional second precision up to milliseconds
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ISO8601OutputTimeFormat = "2006-01-02T15:04:05.999999999Z"
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)
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// IsKnownTimestampFormat returns if the timestamp format name
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// is know to the SDK's protocols.
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func IsKnownTimestampFormat(name string) bool {
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switch name {
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case RFC822TimeFormatName:
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fallthrough
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case ISO8601TimeFormatName:
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fallthrough
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case UnixTimeFormatName:
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return true
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default:
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return false
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}
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}
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// FormatTime returns a string value of the time.
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func FormatTime(name string, t time.Time) string {
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t = t.UTC().Truncate(time.Millisecond)
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switch name {
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case RFC822TimeFormatName:
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return t.Format(RFC822OutputTimeFormat)
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case ISO8601TimeFormatName:
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return t.Format(ISO8601OutputTimeFormat)
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case UnixTimeFormatName:
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ms := t.UnixNano() / int64(time.Millisecond)
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return strconv.FormatFloat(float64(ms)/1e3, 'f', -1, 64)
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default:
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panic("unknown timestamp format name, " + name)
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}
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}
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// ParseTime attempts to parse the time given the format. Returns
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// the time if it was able to be parsed, and fails otherwise.
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func ParseTime(formatName, value string) (time.Time, error) {
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switch formatName {
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case RFC822TimeFormatName: // Smithy HTTPDate format
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return tryParse(value,
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RFC822TimeFormat,
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rfc822TimeFormatSingleDigitDay,
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rfc822TimeFormatSingleDigitDayTwoDigitYear,
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time.RFC850,
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time.ANSIC,
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)
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case ISO8601TimeFormatName: // Smithy DateTime format
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return tryParse(value,
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ISO8601TimeFormat,
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iso8601TimeFormatNoZ,
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time.RFC3339Nano,
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time.RFC3339,
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)
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case UnixTimeFormatName:
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v, err := strconv.ParseFloat(value, 64)
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_, dec := math.Modf(v)
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dec = sdkmath.Round(dec*1e3) / 1e3 //Rounds 0.1229999 to 0.123
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if err != nil {
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return time.Time{}, err
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}
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return time.Unix(int64(v), int64(dec*(1e9))), nil
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default:
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panic("unknown timestamp format name, " + formatName)
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}
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}
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func tryParse(v string, formats ...string) (time.Time, error) {
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var errs parseErrors
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for _, f := range formats {
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t, err := time.Parse(f, v)
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if err != nil {
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errs = append(errs, parseError{
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Format: f,
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Err: err,
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})
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continue
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}
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return t, nil
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}
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return time.Time{}, fmt.Errorf("unable to parse time string, %v", errs)
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}
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type parseErrors []parseError
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func (es parseErrors) Error() string {
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var s bytes.Buffer
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for _, e := range es {
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fmt.Fprintf(&s, "\n * %q: %v", e.Format, e.Err)
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}
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return "parse errors:" + s.String()
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}
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type parseError struct {
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Format string
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Err error
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}
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