65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
package log
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import (
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"time"
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"github.com/go-stack/stack"
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)
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// A Valuer generates a log value. When passed to With or WithPrefix in a
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// value element (odd indexes), it represents a dynamic value which is re-
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// evaluated with each log event.
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type Valuer func() interface{}
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// bindValues replaces all value elements (odd indexes) containing a Valuer
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// with their generated value.
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func bindValues(keyvals []interface{}) {
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for i := 1; i < len(keyvals); i += 2 {
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if v, ok := keyvals[i].(Valuer); ok {
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keyvals[i] = v()
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}
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}
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}
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// containsValuer returns true if any of the value elements (odd indexes)
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// contain a Valuer.
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func containsValuer(keyvals []interface{}) bool {
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for i := 1; i < len(keyvals); i += 2 {
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if _, ok := keyvals[i].(Valuer); ok {
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return true
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}
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}
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return false
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}
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// Timestamp returns a Valuer that invokes the underlying function when bound,
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// returning a time.Time. Users will probably want to use DefaultTimestamp or
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// DefaultTimestampUTC.
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func Timestamp(t func() time.Time) Valuer {
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return func() interface{} { return t() }
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}
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// Caller returns a Valuer that returns a file and line from a specified depth
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// in the callstack. Users will probably want to use DefaultCaller.
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func Caller(depth int) Valuer {
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return func() interface{} { return stack.Caller(depth) }
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}
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var (
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// DefaultTimestamp is a Valuer that returns the current wallclock time,
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// respecting time zones, when bound.
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DefaultTimestamp = Valuer(func() interface{} {
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return time.Now().Format(time.RFC3339Nano)
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})
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// DefaultTimestampUTC is a Valuer that returns the current time in UTC
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// when bound.
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DefaultTimestampUTC = Valuer(func() interface{} {
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return time.Now().UTC().Format(time.RFC3339Nano)
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})
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// DefaultCaller is a Valuer that returns the file and line where the Log
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// method was invoked. It can only be used with log.With.
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DefaultCaller = Caller(3)
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)
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