mirror of
https://github.com/arangodb/kube-arangodb.git
synced 2024-12-14 11:57:37 +00:00
138 lines
3.2 KiB
Go
138 lines
3.2 KiB
Go
//
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// DISCLAIMER
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//
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// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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package exporter
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import (
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"crypto/tls"
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"io/ioutil"
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"net/http"
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"strings"
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"time"
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"github.com/arangodb/kube-arangodb/pkg/util/errors"
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)
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var _ http.Handler = &passthru{}
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func NewPassthru(arangodbEndpoint string, auth Authentication, sslVerify bool, timeout time.Duration) (http.Handler, error) {
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return &passthru{
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factory: newHttpClientFactory(arangodbEndpoint, auth, sslVerify, timeout),
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}, nil
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}
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type httpClientFactory func() (*http.Client, *http.Request, error)
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func newHttpClientFactory(arangodbEndpoint string, auth Authentication, sslVerify bool, timeout time.Duration) httpClientFactory {
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return func() (*http.Client, *http.Request, error) {
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transport := &http.Transport{}
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req, err := http.NewRequest("GET", arangodbEndpoint, nil)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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if !sslVerify {
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transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true}
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}
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jwt, err := auth()
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if err != nil {
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return nil, nil, err
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}
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if jwt != "" {
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hdr, err := CreateArangodJwtAuthorizationHeader(jwt)
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if err != nil {
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return nil, nil, errors.WithStack(err)
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}
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req.Header.Add("Authorization", hdr)
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}
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req.Header.Add("x-arango-allow-dirty-read", "true") // Allow read from follower in AF mode
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client := &http.Client{
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Transport: transport,
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Timeout: timeout,
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}
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return client, req, nil
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}
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}
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type passthru struct {
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factory httpClientFactory
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}
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func (p passthru) get() (*http.Response, error) {
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c, req, err := p.factory()
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if err != nil {
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return nil, err
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}
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return c.Do(req)
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}
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func (p passthru) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
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data, err := p.get()
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if err != nil {
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// Ignore error
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resp.WriteHeader(http.StatusInternalServerError)
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resp.Write([]byte(err.Error()))
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return
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}
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if data.Body == nil {
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// Ignore error
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resp.WriteHeader(http.StatusInternalServerError)
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resp.Write([]byte("Body is empty"))
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return
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}
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defer data.Body.Close()
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response, err := ioutil.ReadAll(data.Body)
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if err != nil {
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// Ignore error
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resp.WriteHeader(http.StatusInternalServerError)
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resp.Write([]byte(err.Error()))
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return
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}
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responseStr := string(response)
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// Fix Header response
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responseStr = strings.ReplaceAll(responseStr, "guage", "gauge")
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// Attach monitor data
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monitorData := currentMembersStatus.Load()
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if monitorData != nil {
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responseStr = responseStr + monitorData.(string)
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}
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resp.WriteHeader(data.StatusCode)
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_, err = resp.Write([]byte(responseStr))
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if err != nil {
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// Ignore error
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resp.WriteHeader(http.StatusInternalServerError)
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resp.Write([]byte("Unable to write body"))
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return
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}
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}
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