65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
package zipkintracer
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"log"
|
|
"strings"
|
|
)
|
|
|
|
// ErrMissingValue adds a Missing Value Error when the Logging Parameters are
|
|
// not even in number
|
|
var ErrMissingValue = errors.New("(MISSING)")
|
|
|
|
// Logger is the fundamental interface for all log operations. Log creates a
|
|
// log event from keyvals, a variadic sequence of alternating keys and values.
|
|
// The signature is compatible with the Go kit log package.
|
|
type Logger interface {
|
|
Log(keyvals ...interface{}) error
|
|
}
|
|
|
|
// NewNopLogger provides a Logger that discards all Log data sent to it.
|
|
func NewNopLogger() Logger {
|
|
return &nopLogger{}
|
|
}
|
|
|
|
// LogWrapper wraps a standard library logger into a Logger compatible with this
|
|
// package.
|
|
func LogWrapper(l *log.Logger) Logger {
|
|
return &wrappedLogger{l: l}
|
|
}
|
|
|
|
// wrappedLogger implements Logger
|
|
type wrappedLogger struct {
|
|
l *log.Logger
|
|
}
|
|
|
|
// Log implements Logger
|
|
func (l *wrappedLogger) Log(k ...interface{}) error {
|
|
if len(k)%2 == 1 {
|
|
k = append(k, ErrMissingValue)
|
|
}
|
|
o := make([]string, len(k)/2)
|
|
for i := 0; i < len(k); i += 2 {
|
|
o[i/2] = fmt.Sprintf("%s=%q", k[i], k[i+1])
|
|
}
|
|
l.l.Println(strings.Join(o, " "))
|
|
return nil
|
|
}
|
|
|
|
// nopLogger implements Logger
|
|
type nopLogger struct{}
|
|
|
|
// Log implements Logger
|
|
func (*nopLogger) Log(_ ...interface{}) error { return nil }
|
|
|
|
// LoggerFunc is an adapter to allow use of ordinary functions as Loggers. If
|
|
// f is a function with the appropriate signature, LoggerFunc(f) is a Logger
|
|
// object that calls f.
|
|
type LoggerFunc func(...interface{}) error
|
|
|
|
// Log implements Logger by calling f(keyvals...).
|
|
func (f LoggerFunc) Log(keyvals ...interface{}) error {
|
|
return f(keyvals...)
|
|
}
|