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request.go
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request.go
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/**
* @license
* Copyright 2020 Dynatrace 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 rest
import (
"bytes"
"io"
"io/ioutil"
"net/http"
"runtime"
"github.com/dynatrace-oss/dynatrace-monitoring-as-code/pkg/util"
"github.com/dynatrace-oss/dynatrace-monitoring-as-code/pkg/version"
"github.com/google/uuid"
)
type Response struct {
StatusCode int
Body []byte
Headers map[string][]string
}
func get(client *http.Client, url string, apiToken string) (Response, error) {
req, err := request(http.MethodGet, url, apiToken)
if err != nil {
return Response{}, err
}
return executeRequest(client, req), nil
}
// the name delete() would collide with the built-in function
func deleteConfig(client *http.Client, url string, apiToken string, id string) error {
req, err := request(http.MethodDelete, url+"/"+id, apiToken)
if err != nil {
return err
}
executeRequest(client, req)
return nil
}
func post(client *http.Client, url string, data []byte, apiToken string) (Response, error) {
req, err := requestWithBody(http.MethodPost, url, bytes.NewBuffer(data), apiToken)
if err != nil {
return Response{}, err
}
return executeRequest(client, req), nil
}
func postMultiPartFile(client *http.Client, url string, data *bytes.Buffer, contentType string, apiToken string) (Response, error) {
req, err := requestWithBody(http.MethodPost, url, data, apiToken)
if err != nil {
return Response{}, err
}
req.Header.Set("Content-type", contentType)
return executeRequest(client, req), nil
}
func put(client *http.Client, url string, data []byte, apiToken string) (Response, error) {
req, err := requestWithBody(http.MethodPut, url, bytes.NewBuffer(data), apiToken)
if err != nil {
return Response{}, err
}
return executeRequest(client, req), nil
}
func request(method string, url string, apiToken string) (*http.Request, error) {
return requestWithBody(method, url, nil, apiToken)
}
func requestWithBody(method string, url string, body io.Reader, apiToken string) (*http.Request, error) {
req, err := http.NewRequest(method, url, body)
if err != nil {
return nil, err
}
req.Header.Set("Authorization", "Api-Token "+apiToken)
req.Header.Set("Content-type", "application/json")
req.Header.Set("User-Agent", "Dynatrace Monitoring as Code/"+version.MonitoringAsCode+" "+(runtime.GOOS+" "+runtime.GOARCH))
return req, nil
}
func executeRequest(client *http.Client, request *http.Request) Response {
var requestId string
if util.IsRequestLoggingActive() {
requestId = uuid.NewString()
err := util.LogRequest(requestId, request)
if err != nil {
util.Log.Warn("error while writing request log for id `%s`: %v", requestId, err)
}
}
rateLimitStrategy := createRateLimitStrategy()
response, err := rateLimitStrategy.executeRequest(util.NewTimelineProvider(), func() (Response, error) {
resp, err := client.Do(request)
if err != nil {
util.Log.Error("HTTP Request failed with Error: " + err.Error())
return Response{}, err
}
defer func() {
err = resp.Body.Close()
}()
body, err := ioutil.ReadAll(resp.Body)
if util.IsResponseLoggingActive() {
err := util.LogResponse(requestId, resp)
if err != nil {
if requestId != "" {
util.Log.Warn("error while writing response log for id `%s`: %v", requestId, err)
} else {
util.Log.Warn("error while writing response log: %v", requestId, err)
}
}
}
return Response{
StatusCode: resp.StatusCode,
Body: body,
Headers: resp.Header,
}, err
})
if err != nil {
// TODO properly handle error
return Response{}
}
return response
}