body_fns.go

/*
Copyright 2022 The Workpieces LLC.

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 httpc

import (
	"bytes"
	"encoding/gob"
	"encoding/json"
	"io"
)

// BodyFn provides a writer to which a value will be written to
// that will make it's way into the HTTP request.
type BodyFn func(w io.Writer) (header string, headerVal string, err error)

// BodyEmpty returns an empty body.
func BodyEmpty(io.Writer) (string, string, error) {
	return "", "", nil
}

// BodyGob gob encodes the value provided for the HTTP request. Sets the
// Content-Encoding to application/gob.
func BodyGob(v interface{}) BodyFn {
	return func(w io.Writer) (string, string, error) {
		return headerContentEncoding, "application/gob", gob.NewEncoder(w).Encode(v)
	}
}

// BodyJSON JSON encodes the value provided for the HTTP request. Sets the
// Content-Type to application/json.
func BodyJSON(v interface{}) BodyFn {
	return func(w io.Writer) (string, string, error) {
		return headerContentType, "application/json", json.NewEncoder(w).Encode(v)
	}
}

type nopBufCloser struct {
	bytes.Buffer
}

func (*nopBufCloser) Close() error {
	return nil
}