66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
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// Copyright (c) 2013 Conformal Systems LLC.
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package btcchain
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import (
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"errors"
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"github.com/conformal/seelog"
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"io"
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)
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// log is a logger that is initialized with no output filters. This
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// means the package will not perform any logging by default until the caller
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// requests it.
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var log seelog.LoggerInterface
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// The default amount of logging is none.
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func init() {
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DisableLog()
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}
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// DisableLog disables all library log output. Logging output is disabled
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// by default until either UseLogger or SetLogWriter are called.
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func DisableLog() {
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log = seelog.Disabled
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}
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// UseLogger uses a specified Logger to output package logging info.
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// This should be used in preference to SetLogWriter if the caller is also
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// using seelog.
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func UseLogger(logger seelog.LoggerInterface) {
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log = logger
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}
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// SetLogWriter uses a specified io.Writer to output package logging info.
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// This allows a caller to direct package logging output without needing a
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// dependency on seelog. If the caller is also using seelog, UseLogger should
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// be used instead.
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func SetLogWriter(w io.Writer) error {
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if w == nil {
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return errors.New("nil writer")
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}
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l, err := seelog.LoggerFromWriterWithMinLevel(w, seelog.TraceLvl)
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if err != nil {
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return err
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}
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UseLogger(l)
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return nil
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}
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// LogClosure is a closure that can be printed with %v to be used to
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// generate expensive-to-create data for a detailed log level and avoid doing
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// the work if the data isn't printed.
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type logClosure func() string
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func (c logClosure) String() string {
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return c()
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}
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func newLogClosure(c func() string) logClosure {
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return logClosure(c)
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}
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