diff --git a/contractcourt/log.go b/contractcourt/log.go new file mode 100644 index 00000000..0168177c --- /dev/null +++ b/contractcourt/log.go @@ -0,0 +1,42 @@ +package contractcourt + +import "github.com/btcsuite/btclog" + +// 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() { + DisableLog() +} + +// DisableLog disables all library log output. Logging output is disabled +// by default until UseLogger is called. +func DisableLog() { + log = 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) +}