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parser.go
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parser.go
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package timeutils // import "github.com/open-telemetry/opentelemetry-collector-contrib/internal/coreinternal/timeutils"
import (
"fmt"
"strings"
"time"
strptime "github.com/observiq/ctimefmt"
)
func ParseStrptime(layout string, value any, location *time.Location) (time.Time, error) {
goLayout, err := strptime.ToNative(layout)
if err != nil {
return time.Time{}, err
}
return ParseGotime(goLayout, value, location)
}
func GetLocation(location *string, layout *string) (*time.Location, error) {
if location != nil && *location != "" {
// If location is specified, it must be in the local timezone database
loc, err := time.LoadLocation(*location)
if err != nil {
return nil, fmt.Errorf("failed to load location %s: %w", *location, err)
}
return loc, nil
}
if layout != nil && strings.HasSuffix(*layout, "Z") {
// If a timestamp ends with 'Z', it should be interpreted at Zulu (UTC) time
return time.UTC, nil
}
return time.Local, nil
}
func ParseGotime(layout string, value any, location *time.Location) (time.Time, error) {
timeValue, err := parseGotime(layout, value, location)
if err != nil {
return time.Time{}, err
}
return SetTimestampYear(timeValue), nil
}
func parseGotime(layout string, value interface{}, location *time.Location) (time.Time, error) {
var str string
switch v := value.(type) {
case string:
str = v
case []byte:
str = string(v)
default:
return time.Time{}, fmt.Errorf("type %T cannot be parsed as a time", value)
}
result, err := time.ParseInLocation(layout, str, location)
// Depending on the timezone database, we may get a pseudo-matching timezone
// This is apparent when the zone is not "UTC", but the offset is still 0
zone, offset := result.Zone()
if offset != 0 || zone == "UTC" {
return result, err
}
// Manually look up the location based on the zone
loc, locErr := time.LoadLocation(zone)
if locErr != nil {
// can't correct offset, just return what we have
return result, fmt.Errorf("failed to load location %s: %w", zone, locErr)
}
// Reparse the timestamp, with the location
resultLoc, locErr := time.ParseInLocation(layout, str, loc)
if locErr != nil {
// can't correct offset, just return original result
return result, err
}
return resultLoc, locErr
}
// SetTimestampYear sets the year of a timestamp to the current year.
// This is needed because year is missing from some time formats, such as rfc3164.
func SetTimestampYear(t time.Time) time.Time {
if t.Year() > 0 {
return t
}
n := Now()
d := time.Date(n.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), t.Location())
// Assume the timestamp is from last year if its month and day are
// more than 7 days past the current date.
// i.e. If today is January 1, but the timestamp is February 1, it's safe
// to assume the timestamp is from last year.
if d.After(n.AddDate(0, 0, 7)) {
d = d.AddDate(-1, 0, 0)
}
return d
}
// Allows tests to override with deterministic value
var Now = time.Now