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// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
package elastic
import (
"bytes"
"compress/gzip"
"encoding/json"
"io"
"io/ioutil"
"net/http"
"runtime"
"strings"
)
// Elasticsearch-specific HTTP request
type Request http.Request
// NewRequest is a http.Request and adds features such as encoding the body.
func NewRequest(method, url string) (*Request, error) {
req, err := http.NewRequest(method, url, nil)
if err != nil {
return nil, err
}
req.Header.Add("User-Agent", "elastic/"+Version+" ("+runtime.GOOS+"-"+runtime.GOARCH+")")
req.Header.Add("Accept", "application/json")
req.Header.Set("Content-Type", "application/json")
return (*Request)(req), nil
}
// SetBasicAuth wraps http.Request's SetBasicAuth.
func (r *Request) SetBasicAuth(username, password string) {
((*http.Request)(r)).SetBasicAuth(username, password)
}
// SetBody encodes the body in the request. Optionally, it performs GZIP compression.
func (r *Request) SetBody(body interface{}, gzipCompress bool) error {
switch b := body.(type) {
case string:
if gzipCompress {
return r.setBodyGzip(b)
} else {
return r.setBodyString(b)
}
default:
if gzipCompress {
return r.setBodyGzip(body)
} else {
return r.setBodyJson(body)
}
}
}
// setBodyJson encodes the body as a struct to be marshaled via json.Marshal.
func (r *Request) setBodyJson(data interface{}) error {
body, err := json.Marshal(data)
if err != nil {
return err
}
r.Header.Set("Content-Type", "application/json")
r.setBodyReader(bytes.NewReader(body))
return nil
}
// setBodyString encodes the body as a string.
func (r *Request) setBodyString(body string) error {
return r.setBodyReader(strings.NewReader(body))
}
// setBodyGzip gzip's the body. It accepts both strings and structs as body.
// The latter will be encoded via json.Marshal.
func (r *Request) setBodyGzip(body interface{}) error {
switch b := body.(type) {
case string:
buf := new(bytes.Buffer)
w := gzip.NewWriter(buf)
if _, err := w.Write([]byte(b)); err != nil {
return err
}
if err := w.Close(); err != nil {
return err
}
r.Header.Add("Content-Encoding", "gzip")
r.Header.Add("Vary", "Accept-Encoding")
return r.setBodyReader(bytes.NewReader(buf.Bytes()))
default:
data, err := json.Marshal(b)
if err != nil {
return err
}
buf := new(bytes.Buffer)
w := gzip.NewWriter(buf)
if _, err := w.Write(data); err != nil {
return err
}
if err := w.Close(); err != nil {
return err
}
r.Header.Add("Content-Encoding", "gzip")
r.Header.Add("Vary", "Accept-Encoding")
r.Header.Set("Content-Type", "application/json")
return r.setBodyReader(bytes.NewReader(buf.Bytes()))
}
}
// setBodyReader writes the body from an io.Reader.
func (r *Request) setBodyReader(body io.Reader) error {
rc, ok := body.(io.ReadCloser)
if !ok && body != nil {
rc = ioutil.NopCloser(body)
}
r.Body = rc
if body != nil {
switch v := body.(type) {
case *strings.Reader:
r.ContentLength = int64(v.Len())
case *bytes.Buffer:
r.ContentLength = int64(v.Len())
}
}
return nil
}
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