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65 lines
1.5 KiB
65 lines
1.5 KiB
package log
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import (
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"context"
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"runtime"
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"strconv"
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"strings"
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"time"
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)
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var (
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// DefaultCaller is a Valuer that returns the file and line.
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DefaultCaller = Caller(4)
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// DefaultTimestamp is a Valuer that returns the current wallclock time.
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DefaultTimestamp = Timestamp(time.RFC3339)
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)
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// Valuer is returns a log value.
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type Valuer func(ctx context.Context) interface{}
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// Value return the function value.
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func Value(ctx context.Context, v interface{}) interface{} {
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if v, ok := v.(Valuer); ok {
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return v(ctx)
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}
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return v
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}
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// Caller returns a Valuer that returns a pkg/file:line description of the caller.
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func Caller(depth int) Valuer {
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return func(context.Context) interface{} {
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_, file, line, _ := runtime.Caller(depth)
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idx := strings.LastIndexByte(file, '/')
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if idx == -1 {
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return file[idx+1:] + ":" + strconv.Itoa(line)
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}
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idx = strings.LastIndexByte(file[:idx], '/')
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return file[idx+1:] + ":" + strconv.Itoa(line)
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}
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}
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// Timestamp returns a timestamp Valuer with a custom time format.
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func Timestamp(layout string) Valuer {
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return func(context.Context) interface{} {
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return time.Now().Format(layout)
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}
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}
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func bindValues(ctx context.Context, 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(ctx)
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}
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}
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}
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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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