/
client.go
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/
client.go
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/*
Copyright 2021 The Everoute 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 (
"context"
"crypto/tls"
"encoding/json"
"fmt"
"net/http"
"net/url"
"sync"
"time"
"github.com/gorilla/websocket"
"k8s.io/apimachinery/pkg/util/uuid"
"k8s.io/klog"
"github.com/everoute/everoute/plugin/tower/pkg/schema"
"github.com/everoute/everoute/plugin/tower/pkg/utils"
)
type Client struct {
URL string `yaml:"url"`
UserInfo *UserInfo `yaml:"user_info"`
// AllowInsecure set whether to check the server certificates
AllowInsecure bool
// Dialer dial websocket connecting to graphql server for subscription.
// If nil, websocket.DefaultDialer will be used.
Dialer *websocket.Dialer
// HTTPClient dial http connecting to graphql server for query.
// If nil, http.DefaultClient will be used.
HTTPClient *http.Client
// If set, mutation will wait task down.
TaskMonitor TaskMonitor
tokenLock sync.RWMutex
token string
}
const (
responseChanLenth = 10
)
// Subscription subscribe change of objects, subscribe will stop when get response error, subscribe
// also could be stopped by run return function stopWatch().
func (c *Client) Subscription(req *Request) (respCh <-chan Response, stopWatch func(), err error) {
var respChan = make(chan Response, responseChanLenth)
msg := Message{
ID: string(uuid.NewUUID()),
Type: StartMsg,
}
msg.PayLoad, err = json.Marshal(req)
if err != nil {
return nil, nil, fmt.Errorf("failed to marshal request: %s", err)
}
conn, err := c.newWebsocketConn()
if err != nil {
return nil, nil, err
}
if err = conn.WriteJSON(msg); err != nil {
conn.Close()
return nil, nil, fmt.Errorf("failed to write message %v: %s", msg, err)
}
var stopChan = make(chan struct{})
go loopReadMessage(conn, respChan, stopChan)
return respChan, closeChanFunc(stopChan), nil
}
// Query send query request to tower
func (c *Client) Query(req *Request) (*Response, error) {
request, err := EncodeRequest(req)
if err != nil {
return nil, fmt.Errorf("failed to encode request: %s", err)
}
klog.V(10).Infof("query request body %s", request.String())
r, err := http.NewRequestWithContext(context.TODO(), http.MethodPost, c.URL, request.GetReader())
if err != nil {
return nil, fmt.Errorf("failed call http.NewRequest: %s", err)
}
c.setScheme(r.URL, false)
c.setHeader(r.Header, request.ContentType(), false)
httpResp, err := c.httpClient().Do(r)
if err != nil {
return nil, err
}
defer httpResp.Body.Close()
var resp Response
if err := json.NewDecoder(httpResp.Body).Decode(&resp); err != nil {
return nil, fmt.Errorf("server response code: %d, err: %s", httpResp.StatusCode, err)
}
if taskID := httpResp.Header.Get("x-task-id"); taskID != "" && c.TaskMonitor != nil {
task, err := c.TaskMonitor.WaitForTask(context.Background(), taskID)
if err != nil {
return nil, err
}
if task.ErrorCode != nil && task.ErrorMessage != nil {
return nil, &ResponseError{
Message: *task.ErrorMessage,
Code: ErrorCode(*task.ErrorCode),
}
}
}
return &resp, nil
}
// Auth send login request to tower, and save token
func (c *Client) Auth() (string, error) {
var token string
if c.UserInfo == nil {
return "", fmt.Errorf("anonymous login to server not allow")
}
authRequest := &Request{
Query: "mutation($data: LoginInput!) {login(data: $data) {token}}",
Variables: map[string]interface{}{"data": c.UserInfo},
}
resp, err := c.Query(authRequest)
if err != nil {
return "", fmt.Errorf("failed to login tower: %s", err)
}
if len(resp.Errors) != 0 {
return "", fmt.Errorf("receive unexpected errors: %v", resp.Errors)
}
tokenRaw := utils.LookupJSONRaw(resp.Data, "login", "token")
err = json.Unmarshal(tokenRaw, &token)
if err != nil {
return "", fmt.Errorf("failed to unmarshal %s to token: %s", tokenRaw, err)
}
c.SetToken(token)
return token, nil
}
func (c *Client) newWebsocketConn() (*websocket.Conn, error) {
header := http.Header{}
u, err := url.Parse(c.URL)
if err != nil {
return nil, fmt.Errorf("failed to parse url %s: %s", c.URL, err)
}
c.setScheme(u, true)
c.setHeader(header, "", true)
conn, resp, err := c.dialer().Dial(u.String(), header)
if err != nil {
return nil, fmt.Errorf("failed to dialer %s: %s", u, err)
}
resp.Body.Close()
err = c.initWebsocketConn(conn)
if err != nil {
conn.Close()
return nil, fmt.Errorf("failed to init connection: %s", err)
}
return conn, nil
}
func (c *Client) initWebsocketConn(conn *websocket.Conn) error {
initMsg := Message{Type: ConnectionInitMsg}
initPayload := make(map[string]interface{})
if token := c.getToken(); token != "" {
initPayload["Authorization"] = token
}
if err := conn.WriteJSON(initMsg); err != nil {
return fmt.Errorf("send connection init message: %s", err)
}
var msg Message
if err := conn.ReadJSON(&msg); err != nil {
return fmt.Errorf("read connection ack message: %s", err)
}
if msg.Type != ConnectionAckMsg {
return fmt.Errorf("expect receieve ack message")
}
return nil
}
func (c *Client) setHeader(header http.Header, contentType string, websocket bool) {
header.Set("Content-Type", contentType)
header.Set("Accept", "application/json")
if token := c.getToken(); token != "" {
header.Set("Authorization", token)
}
if websocket {
header.Set("Sec-Websocket-Protocol", "graphql-ws")
}
}
// when use http, set scheme https/http; when use ws, set scheme wss/ws.
func (c *Client) setScheme(u *url.URL, websocket bool) {
var secure bool
switch u.Scheme {
case "https", "wss":
secure = true
}
u.Scheme = "http"
if websocket {
u.Scheme = "ws"
}
if secure {
u.Scheme = fmt.Sprintf("%ss", u.Scheme)
}
}
func (c *Client) SetToken(token string) {
c.tokenLock.Lock()
defer c.tokenLock.Unlock()
c.token = token
}
func (c *Client) getToken() string {
c.tokenLock.RLock()
defer c.tokenLock.RUnlock()
return c.token
}
func (c *Client) dialer() *websocket.Dialer {
if c.Dialer == nil {
// #nosec G402
return &websocket.Dialer{
Proxy: http.ProxyFromEnvironment,
HandshakeTimeout: 45 * time.Second,
TLSClientConfig: &tls.Config{InsecureSkipVerify: c.AllowInsecure},
}
}
return c.Dialer
}
// we reuse the insecureClient to reuse the underlay tcp connection
var insecureClient = func() *http.Client {
transport := http.DefaultTransport.(*http.Transport).Clone()
transport.TLSClientConfig = &tls.Config{InsecureSkipVerify: true} // #nosec G402
return &http.Client{Transport: transport}
}()
func (c *Client) httpClient() *http.Client {
if c.HTTPClient == nil {
if c.AllowInsecure {
return insecureClient
}
return http.DefaultClient
}
return c.HTTPClient
}
// loopReadMessage loop read message from conn until read error or get signal from stopChan
func loopReadMessage(conn *websocket.Conn, respChan chan<- Response, stopChan chan struct{}) {
// we close the connection before return
// goroutines read from the connection would get an error
defer conn.Close()
// we start a new goroutine to handle WebSocket response
// make sure when stopChan close, we can return immediately
go func() {
// to make sure no data race happens, we should close respChan
// and write to respChan in the same goroutine
defer close(respChan)
for {
resp := readConnResponse(conn)
select {
case <-stopChan:
// check if already stop before send to response chan
return
default:
respChan <- resp
if len(resp.Errors) != 0 {
// stop watch when get response error
closeChanFunc(stopChan)()
return
}
}
}
}()
<-stopChan
}
// readConnResponse would block until message from the connection or the connection closed
func readConnResponse(conn *websocket.Conn) Response {
var msg Message
var resp Response
loopread:
for {
if err := conn.ReadJSON(&msg); err != nil {
return connectErrorMessage("error read response message: %s", err)
}
switch msg.Type {
case ConnectionKeepAliveMsg:
continue // ignore keepalived request message
case DataMsg:
break loopread
case ErrorMsg, ConnectionErrorMsg:
return connectErrorMessage(string(msg.PayLoad))
case CompleteMsg:
return connectErrorMessage("unexpect complete msg, payload: %+v", string(msg.PayLoad))
default:
return connectErrorMessage("unknow message type %s, payload: %+v", msg.Type, string(msg.PayLoad))
}
}
if err := json.Unmarshal(msg.PayLoad, &resp); err != nil {
return connectErrorMessage("error unmarshal json message: %s", err)
}
return resp
}
func connectErrorMessage(format string, a ...interface{}) Response {
var resp Response
resp.Errors = append(resp.Errors, ResponseError{
Message: fmt.Sprintf(format, a...),
Code: WebsocketConnectError,
})
return resp
}
// closeChanFunc close chan once, prevent panic of multiple close chan.
func closeChanFunc(ch chan struct{}) func() {
return func() {
select {
case _, ok := <-ch:
// skipped when chan already closed
if ok {
close(ch)
}
default:
close(ch)
}
}
}
type TaskMonitor interface {
WaitForTask(ctx context.Context, taskID string) (*schema.Task, error)
}