mirror of https://github.com/kubernetes/kops.git
134 lines
3.3 KiB
Go
134 lines
3.3 KiB
Go
/*
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Copyright 2020 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package kopscontrollerclient
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import (
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"bufio"
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"bytes"
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"context"
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"fmt"
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"net"
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"net/http"
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"net/url"
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"os"
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"path"
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"time"
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"k8s.io/klog/v2"
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"k8s.io/kops/pkg/bootstrap"
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"k8s.io/kops/upup/pkg/fi"
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"k8s.io/kops/upup/pkg/fi/cloudup"
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)
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type Client struct {
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// Authenticator generates authentication credentials for requests.
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Authenticator bootstrap.Authenticator
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// CAs are the CA certificates for kops-controller.
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CAs []byte
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// BaseURL is the base URL for the server
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BaseURL url.URL
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httpClient *http.Client
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}
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func (b *Client) Query(ctx context.Context, req any, resp any) error {
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if b.httpClient == nil {
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certPool := x509.NewCertPool()
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certPool.AppendCertsFromPEM(b.CAs)
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transport := &http.Transport{
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TLSClientConfig: &tls.Config{
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RootCAs: certPool,
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MinVersion: tls.VersionTLS12,
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},
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}
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httpClient := &http.Client{
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Timeout: time.Duration(15) * time.Second,
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Transport: transport,
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}
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b.httpClient = httpClient
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}
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// Sanity-check DNS to provide clearer diagnostic messages.
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if ips, err := net.LookupIP(b.BaseURL.Hostname()); err != nil {
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if dnsErr, ok := err.(*net.DNSError); ok && dnsErr.IsNotFound {
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return fi.NewTryAgainLaterError(fmt.Sprintf("kops-controller DNS not setup yet (not found: %v)", dnsErr))
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}
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return err
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} else if len(ips) == 1 && (ips[0].String() == cloudup.PlaceholderIP || ips[0].String() == cloudup.PlaceholderIPv6) {
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return fi.NewTryAgainLaterError(fmt.Sprintf("kops-controller DNS not setup yet (placeholder IP found: %v)", ips))
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}
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reqBytes, err := json.Marshal(req)
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if err != nil {
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return err
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}
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bootstrapURL := b.BaseURL
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bootstrapURL.Path = path.Join(bootstrapURL.Path, "/bootstrap")
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httpReq, err := http.NewRequestWithContext(ctx, "POST", bootstrapURL.String(), bytes.NewReader(reqBytes))
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if err != nil {
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return err
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}
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httpReq.Header.Set("Content-Type", "application/json")
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token, err := b.Authenticator.CreateToken(reqBytes)
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if err != nil {
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return err
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}
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httpReq.Header.Set("Authorization", token)
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response, err := b.httpClient.Do(httpReq)
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if err != nil {
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return err
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}
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if response.Body != nil {
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defer response.Body.Close()
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}
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// if we receive StatusConflict it means that we should exit gracefully
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if response.StatusCode == http.StatusConflict {
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klog.Infof("kops-controller returned status code %d", response.StatusCode)
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os.Exit(0)
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}
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if response.StatusCode != http.StatusOK {
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detail := ""
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if response.Body != nil {
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scanner := bufio.NewScanner(response.Body)
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if scanner.Scan() {
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detail = scanner.Text()
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}
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}
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return fmt.Errorf("kops-controller returned status code %d: %s", response.StatusCode, detail)
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}
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return json.NewDecoder(response.Body).Decode(resp)
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}
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func (b *Client) Close() {
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if b.httpClient != nil {
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b.httpClient.CloseIdleConnections()
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}
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}
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