lnd.xprv/lnrpc/routerrpc/log.go

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package routerrpc
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
// Subsystem defines the logging code for this subsystem.
const Subsystem = "RRPC"
// The default amount of logging is none.
func init() {
UseLogger(build.NewSubLogger(Subsystem, 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.
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type logClosure func() string // nolint:unused
// 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.
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func newLogClosure(c func() string) logClosure { // nolint:unused
return logClosure(c)
}