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71 lines
1.8 KiB
71 lines
1.8 KiB
// Copyright (c) 2013-2014 The btcsuite developers |
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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 blockchain |
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import ( |
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"errors" |
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"io" |
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"github.com/btcsuite/btclog" |
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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 btclog.Logger |
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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 = btclog.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 btclog. |
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func UseLogger(logger btclog.Logger) { |
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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 btclog, UseLogger should |
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// be used instead. |
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func SetLogWriter(w io.Writer, level string) 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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lvl, ok := btclog.LogLevelFromString(level) |
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if !ok { |
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return errors.New("invalid log level") |
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} |
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l, err := btclog.NewLoggerFromWriter(w, lvl) |
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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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