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client.go
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client.go
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// Copyright (c) 2021 The Jaeger Authors.
//
// 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 client
import (
"bytes"
"fmt"
"io"
"net/http"
)
// ResponseError holds information about a request error
type ResponseError struct {
// Error returned by the http client
Err error
// StatusCode is the http code returned by the server (if any)
StatusCode int
// Body is the bytes readed in the response (if any)
Body []byte
}
// Error returns the error string of the Err field
func (r ResponseError) Error() string {
return r.Err.Error()
}
func (r ResponseError) prefixMessage(message string) ResponseError {
return ResponseError{
Err: fmt.Errorf("%s, %w", message, r.Err),
StatusCode: r.StatusCode,
Body: r.Body,
}
}
func newResponseError(err error, code int, body []byte) ResponseError {
return ResponseError{
Err: err,
StatusCode: code,
Body: body,
}
}
// Client is a generic client to make requests to ES
type Client struct {
// Http client.
Client *http.Client
// ES server endpoint.
Endpoint string
// Basic authentication string.
BasicAuth string
}
type elasticRequest struct {
endpoint string
body []byte
method string
}
func (c *Client) request(esRequest elasticRequest) ([]byte, error) {
var reader *bytes.Buffer
var r *http.Request
var err error
if len(esRequest.body) > 0 {
reader = bytes.NewBuffer(esRequest.body)
r, err = http.NewRequest(esRequest.method, fmt.Sprintf("%s/%s", c.Endpoint, esRequest.endpoint), reader)
} else {
r, err = http.NewRequest(esRequest.method, fmt.Sprintf("%s/%s", c.Endpoint, esRequest.endpoint), nil)
}
if err != nil {
return []byte{}, err
}
c.setAuthorization(r)
r.Header.Add("Content-Type", "application/json")
res, err := c.Client.Do(r)
if err != nil {
return []byte{}, err
}
if res.StatusCode != http.StatusOK {
return []byte{}, c.handleFailedRequest(res)
}
body, err := io.ReadAll(res.Body)
if err != nil {
return []byte{}, err
}
return body, nil
}
func (c *Client) setAuthorization(r *http.Request) {
if c.BasicAuth != "" {
r.Header.Add("Authorization", fmt.Sprintf("Basic %s", c.BasicAuth))
}
}
func (c *Client) handleFailedRequest(res *http.Response) error {
if res.Body != nil {
bodyBytes, err := io.ReadAll(res.Body)
if err != nil {
return newResponseError(fmt.Errorf("request failed and failed to read response body, status code: %d, %w", res.StatusCode, err), res.StatusCode, nil)
}
body := string(bodyBytes)
return newResponseError(fmt.Errorf("request failed, status code: %d, body: %s", res.StatusCode, body), res.StatusCode, bodyBytes)
}
return newResponseError(fmt.Errorf("request failed, status code: %d", res.StatusCode), res.StatusCode, nil)
}