github.com/palcoin-project/palcd@v1.0.0/txscript/log.go (about)

     1  // Copyright (c) 2013-2015 The btcsuite developers
     2  // Use of this source code is governed by an ISC
     3  // license that can be found in the LICENSE file.
     4  
     5  package txscript
     6  
     7  import "github.com/palcoin-project/palclog"
     8  
     9  // log is a logger that is initialized with no output filters.  This
    10  // means the package will not perform any logging by default until the caller
    11  // requests it.
    12  var log palclog.Logger
    13  
    14  // The default amount of logging is none.
    15  func init() {
    16  	DisableLog()
    17  }
    18  
    19  // DisableLog disables all library log output.  Logging output is disabled
    20  // by default until UseLogger is called.
    21  func DisableLog() {
    22  	log = palclog.Disabled
    23  }
    24  
    25  // UseLogger uses a specified Logger to output package logging info.
    26  func UseLogger(logger palclog.Logger) {
    27  	log = logger
    28  }
    29  
    30  // LogClosure is a closure that can be printed with %v to be used to
    31  // generate expensive-to-create data for a detailed log level and avoid doing
    32  // the work if the data isn't printed.
    33  type logClosure func() string
    34  
    35  func (c logClosure) String() string {
    36  	return c()
    37  }
    38  
    39  func newLogClosure(c func() string) logClosure {
    40  	return logClosure(c)
    41  }