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encoder.go
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encoder.go
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// Copyright 2016 IBM Corporation
//
// 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 replication
import (
"fmt"
"io"
"strings"
)
var (
encFields = []struct {
prefix string
value func(event) string
}{
{"id: ", event.ID},
{"event: ", event.Event},
{"data: ", event.Data},
}
)
type encoder struct {
w io.Writer
}
func newEncoder(w io.Writer) *encoder {
return &encoder{w: w}
}
func (enc *encoder) Encode(ev event) (err error) {
for _, field := range encFields {
prefix, value := field.prefix, field.value(ev)
if len(value) == 0 {
continue
}
value = strings.Replace(value, "\n", "\n"+prefix, -1)
if _, err = io.WriteString(enc.w, prefix+value+"\n"); err != nil {
err = fmt.Errorf("Encode: %s", err)
return
}
}
if _, err = io.WriteString(enc.w, "\n"); err != nil {
err = fmt.Errorf("Fail Encode: %s", err)
}
return
}