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log.go
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log.go
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// This code is available on the terms of the project LICENSE.md file,
// also available online at https://blueoakcouncil.org/license/1.0.0.
package main
import (
"fmt"
"os"
"decred.org/dcrdex/dex"
"github.com/jrick/logrotate/rotator"
)
var (
// logRotator is one of the logging outputs. It should be closed on
// application shutdown.
logRotator *rotator.Rotator
log dex.Logger
)
// logWriter implements an io.Writer that outputs to stdout
// and a rotating log file.
type logWriter struct{}
// Write writes the data in p to both destinations.
func (w logWriter) Write(p []byte) (n int, err error) {
os.Stdout.Write(p)
return logRotator.Write(p)
}
// initLogging initializes the logging rotater to write logs to logFile and
// create roll files in the same directory. initLogging must be called before
// the package-global log rotator variables are used.
func initLogging(lvl string, utc bool) *dex.LoggerMaker {
err := os.MkdirAll(logDirectory, 0700)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to create log directory: %v\n", err)
os.Exit(1)
}
logRotator, err = rotator.New(logFilename, 32*1024, false, maxLogRolls)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to create file rotator: %v\n", err)
os.Exit(1)
}
lm, err := dex.NewLoggerMaker(logWriter{}, lvl, utc)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to create custom logger: %v\n", err)
os.Exit(1)
}
log = lm.Logger("APP")
return lm
}
// closeFileLogger closes the log rotator.
func closeFileLogger() {
if logRotator != nil {
logRotator.Close()
}
}