46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
package monitoring
|
|
|
|
import (
|
|
"github.com/btcsuite/btclog"
|
|
"github.com/lightningnetwork/lnd/build"
|
|
)
|
|
|
|
// log is a logger that is initialized with no output filters. This means the
|
|
// package will not perform any logging by default until the caller requests
|
|
// it.
|
|
var log btclog.Logger
|
|
|
|
// The default amount of logging is none.
|
|
func init() {
|
|
UseLogger(build.NewSubLogger("PROM", nil))
|
|
}
|
|
|
|
// DisableLog disables all library log output. Logging output is disabled by
|
|
// default until UseLogger is called.
|
|
func DisableLog() {
|
|
UseLogger(btclog.Disabled)
|
|
}
|
|
|
|
// UseLogger uses a specified Logger to output package logging info. This
|
|
// should be used in preference to SetLogWriter if the caller is also using
|
|
// btclog.
|
|
func UseLogger(logger btclog.Logger) {
|
|
log = logger
|
|
}
|
|
|
|
// logClosure is used to provide a closure over expensive logging operations so
|
|
// don't have to be performed when the logging level doesn't warrant it.
|
|
type logClosure func() string
|
|
|
|
// String invokes the underlying function and returns the result.
|
|
func (c logClosure) String() string {
|
|
return c()
|
|
}
|
|
|
|
// newLogClosure returns a new closure over a function that returns a string
|
|
// which itself provides a Stringer interface so that it can be used with the
|
|
// logging system.
|
|
func newLogClosure(c func() string) logClosure {
|
|
return logClosure(c)
|
|
}
|