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// Package buflog provides a buffered logging class that accumulates logs in
// memory until the flush threshold is reached which release stored logs, the
// buffered logger then act as a normal logger.
//
// Basic example:
//
// logger := buflog.New(os.Stdout, log.Info, log.Error)
// logger.Info("Connecting to the server...") // Outputs nothing
// logger.Error("Connection failed") // Outputs both lines
package buflog
import (
"bufio"
"io"
"github.com/alexcesaro/log"
"github.com/alexcesaro/log/golog"
)
// A Logger represents an active buffered logging object.
type Logger struct {
*golog.Logger
flush log.Level
buffer *bufio.Writer
}
// New creates a new Logger. The out variable sets the destination to which
// log data will be written. The threshold variable defines the level under
// which logging will be ignored. The flushThreshold variable defines the
// level above which logging will be output.
func New(out io.Writer, threshold log.Level, flushThreshold log.Level) *Logger {
logger := &Logger{
Logger: golog.New(out, threshold),
flush: flushThreshold,
buffer: bufio.NewWriter(out),
}
replaceWriter(logger)
return logger
}
func replaceWriter(logger *Logger) {
oldWriter := logger.Logger.Writer
logger.Logger.Writer = func(out io.Writer, logLine []byte, level log.Level) {
if level > logger.flush {
logger.buffer.Write(logLine)
} else {
logger.buffer.Flush()
logger.Logger.Writer = oldWriter
logger.Logger.Writer(out, logLine, level)
}
}
}
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