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error.go
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error.go
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//
// (C) Copyright 2019-2021 Intel Corporation.
//
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
package logging
import (
"fmt"
"io"
"log"
"os"
)
const errorLogFlags = log.LstdFlags
// NewCommandLineErrorLogger returns an ErrorLogger configured
// for outputting unadorned error messages (i.e. no timestamps,
// source info, etc); typically used for CLI utility logging.
func NewCommandLineErrorLogger(output io.Writer) *DefaultErrorLogger {
return &DefaultErrorLogger{
baseLogger{
dest: output,
log: log.New(output, "ERROR: ", emptyLogFlags),
},
}
}
// NewErrorLogger returns an ErrorLogger configured for outputting
// error messages with standard formatting (e.g. to stderr, logfile, etc.)
func NewErrorLogger(prefix string, output io.Writer) *DefaultErrorLogger {
loggerPrefix := "ERROR "
if prefix != "" {
loggerPrefix = prefix + " " + loggerPrefix
}
return &DefaultErrorLogger{
baseLogger{
dest: output,
prefix: prefix,
log: log.New(output, loggerPrefix, errorLogFlags),
},
}
}
// DefaultErrorLogger implements the ErrorLogger interface.
type DefaultErrorLogger struct {
baseLogger
}
// Errorf emits a formatted error message.
func (l *DefaultErrorLogger) Errorf(format string, args ...interface{}) {
out := fmt.Sprintf(format, args...)
if err := l.log.Output(logOutputDepth, out); err != nil {
fmt.Fprintf(os.Stderr, "logger Errorf() failed: %s\n", err)
}
}