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log.go
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log.go
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// Copyright (c) 2020-2021 Blockwatch Data Inc.
// Author: alex@blockwatch.cc
//nolint:unused,deadcode
package rpc
import logpkg "github.com/echa/log"
// 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 logpkg.Logger = logpkg.Log
// The default amount of logging is none.
func init() {
DisableLog()
}
// DisableLog disables all library log output. Logging output is disabled
// by default until either UseLogger or SetLogWriter are called.
func DisableLog() {
log = logpkg.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 logpkg.
func UseLogger(logger logpkg.Logger) {
log = logger
}
// LogClosure is a closure that can be printed with %v to be used to
// generate expensive-to-create data for a detailed log level and avoid doing
// the work if the data isn't printed.
type logClosure func() string
// String invokes the log closure and returns the results string.
func (c logClosure) String() string {
return c()
}
// newLogClosure returns a new closure over the passed function which allows
// it to be used as a parameter in a logging function that is only invoked when
// the logging level is such that the message will actually be logged.
func newLogClosure(c func() string) logClosure {
return logClosure(c)
}
func logDebug(c func()) {
if log.Level() <= logpkg.LevelDebug {
c()
}
}