100 lines
3 KiB
Go
100 lines
3 KiB
Go
/*
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* Copyright (c) 2013, 2014 Conformal Systems LLC <info@conformal.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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package main
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import (
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"fmt"
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"github.com/conformal/seelog"
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"os"
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)
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var (
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log = seelog.Disabled
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)
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// logClosure is used to provide a closure over expensive logging operations
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// so don't have to be performed when the logging level doesn't warrant it.
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type logClosure func() string
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// String invokes the underlying function and returns the result.
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func (c logClosure) String() string {
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return c()
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}
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// newLogClosure returns a new closure over a function that returns a string
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// which itself provides a Stringer interface so that it can be used with the
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// logging system.
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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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// newLogger creates a new seelog logger using the provided logging level and
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// log message prefix.
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func newLogger(level string, prefix string) seelog.LoggerInterface {
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//<seelog type="adaptive" mininterval="2000000" maxinterval="100000000"
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// critmsgcount="500" minlevel="%s">
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fmtstring := `
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<seelog type="sync" minlevel="%s">
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<outputs formatid="all">
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<console/>
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</outputs>
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<formats>
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<format id="all" format="%%Time %%Date [%%LEV] %s: %%Msg%%n" />
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</formats>
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</seelog>`
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config := fmt.Sprintf(fmtstring, level, prefix)
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logger, err := seelog.LoggerFromConfigAsString(config)
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if err != nil {
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fmt.Fprintf(os.Stderr, "failed to create logger: %v", err)
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os.Exit(1)
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}
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return logger
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}
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// useLogger sets the btcd logger to the passed logger.
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func useLogger(logger seelog.LoggerInterface) {
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log = logger
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}
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// setLogLevel sets the log level for the logging system. It initializes a
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// logger for each subsystem at the provided level.
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func setLogLevel(logLevel string) []seelog.LoggerInterface {
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var loggers []seelog.LoggerInterface
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// Define sub-systems.
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subSystems := []struct {
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level string
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prefix string
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useLogger func(seelog.LoggerInterface)
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}{
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{logLevel, "BTCW", useLogger},
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}
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// Configure all sub-systems with new loggers while keeping track of
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// the created loggers to return so they can be flushed.
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for _, s := range subSystems {
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newLog := newLogger(s.level, s.prefix)
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loggers = append(loggers, newLog)
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s.useLogger(newLog)
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}
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return loggers
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}
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