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formatters.go
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/
formatters.go
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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package capnslog
import (
"bufio"
"fmt"
"io"
"strings"
"time"
)
type Formatter interface {
Format(pkg string, level LogLevel, depth int, entries ...interface{})
Flush()
}
func NewStringFormatter(w io.Writer) *StringFormatter {
return &StringFormatter{
w: bufio.NewWriter(w),
}
}
type StringFormatter struct {
w *bufio.Writer
}
func (s *StringFormatter) Format(pkg string, l LogLevel, i int, entries ...interface{}) {
now := time.Now()
y, m, d := now.Date()
h, min, sec := now.Clock()
s.w.WriteString(fmt.Sprintf("%d/%02d/%d %02d:%02d:%02d ", y, m, d, h, min, sec))
s.writeEntries(pkg, l, i, entries...)
}
func (s *StringFormatter) writeEntries(pkg string, _ LogLevel, _ int, entries ...interface{}) {
if pkg != "" {
s.w.WriteString(pkg + ": ")
}
str := fmt.Sprint(entries...)
endsInNL := strings.HasSuffix(str, "\n")
s.w.WriteString(str)
if !endsInNL {
s.w.WriteString("\n")
}
s.Flush()
}
func (s *StringFormatter) Flush() {
s.w.Flush()
}