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separator.go
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/
separator.go
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// Copyright (c) 2017 Tigera, Inc. All rights reserved.
// 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 yaml
import (
"bufio"
"bytes"
"io"
)
const (
yamlSeparator = "\n---"
maxDocumentLength = 10 * 1024 * 1024 // 10MB.
)
type Separator interface {
Next() ([]byte, error)
}
type YAMLSeparator struct {
scanner *bufio.Scanner
}
func NewYAMLDocumentSeparator(reader io.Reader) Separator {
scanner := bufio.NewScanner(reader)
scanner.Buffer(make([]byte, 1024), maxDocumentLength)
scanner.Split(splitYAMLDocument)
return &YAMLSeparator{
scanner: scanner,
}
}
// Copyright 2014 The Kubernetes Authors.
// Function originally from:
// https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apimachinery/pkg/util/yaml/decoder.go .
func splitYAMLDocument(data []byte, atEOF bool) (advance int, token []byte, err error) {
if atEOF && len(data) == 0 {
return 0, nil, nil
}
sep := len([]byte(yamlSeparator))
if i := bytes.Index(data, []byte(yamlSeparator)); i >= 0 {
// We have a potential document terminator
i += sep
after := data[i:]
if len(after) == 0 {
// we can't read any more characters
if atEOF {
return len(data), data[:len(data)-sep], nil
}
return 0, nil, nil
}
if j := bytes.IndexByte(after, '\n'); j >= 0 {
return i + j + 1, data[0 : i-sep], nil
}
return 0, nil, nil
}
// If we're at EOF, we have a final, non-terminated line. Return it.
if atEOF {
return len(data), data, nil
}
// Request more data.
return 0, nil, nil
}
func (t *YAMLSeparator) Next() ([]byte, error) {
if !t.scanner.Scan() {
err := t.scanner.Err()
if err == nil {
err = io.EOF
}
return []byte{}, err
}
return t.scanner.Bytes(), nil
}