/
log.go
executable file
·56 lines (47 loc) · 1.49 KB
/
log.go
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// Logging
package scanner
import (
"io"
"log"
"os"
"strings"
)
// SetupLogging will return a log.Logger object that can be used for logging.
// It will write the logs to all io.Writers designated in logs.
// If there are any errors, it will return nil and the appropriate error.
// Usage:
// SetupLogging("log1.txt") = only log to one file
// SetupLogging("log1.txt", "os.Stdout") = log to both os.Stdout and file
// SetupLogging("log1.txt", "log2.txt") = log to two files
// SetupLogging("os.Stdout") = only log to stdout
// SetupLogging("os.Stderr", "os.Stdout") = log to both os.Stdout and os.Stderr
func SetupLogging(logwriters ...string) (*log.Logger, error) {
var writers []io.Writer
// Add all logwriters
for _, log := range logwriters {
// Add os.Stdout and os.Stderr if provided
if strings.ToLower(log) == "os.stdout" {
writers = append(writers, os.Stdout)
continue
}
if strings.ToLower(log) == "os.stderr" {
writers = append(writers, os.Stderr)
continue
}
// Otherwise attempt to create/open a file with that name/path
logFile, err := os.Create(log)
if err != nil {
return nil, err
}
writers = append(writers, logFile)
}
// If nothing is provided, use os.Stdout
if len(logwriters) == 0 {
writers = append(writers, os.Stdout)
}
// Create a multiwriter from all writers
multiW := io.MultiWriter(writers...)
// Create logger and return
logger := log.New(multiW, LogPrefix, LogFlag)
return logger, nil
}