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client.go
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client.go
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package cycloneserver
import (
"bufio"
"fmt"
"io"
"net/http"
"net/url"
"strings"
"time"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
websocketutil "github.com/caicloud/cyclone/pkg/util/websocket"
)
const (
cycloneAPIVersion = "/apis/v1alpha1"
apiPathForLogStream = "/workflowruns/%s/streamlogs"
)
// Client ...
type Client interface {
PushLogStream(ns, workflowrun, stage, container string, reader io.Reader, close chan struct{}) error
}
type client struct {
baseURL string
client *http.Client
}
// NewClient ...
func NewClient(cycloneServer string) Client {
baseURL := strings.TrimRight(cycloneServer, "/")
if !strings.Contains(baseURL, "://") {
baseURL = "http://" + baseURL
}
return &client{
baseURL: baseURL,
client: http.DefaultClient,
}
}
// PushLogStream ...
func (c *client) PushLogStream(ns, workflowrun, stage, container string, reader io.Reader, close chan struct{}) error {
path := fmt.Sprintf(apiPathForLogStream, workflowrun)
host := strings.TrimPrefix(c.baseURL, "http://")
host = strings.TrimPrefix(host, "https://")
requestURL := url.URL{
Host: host,
Path: cycloneAPIVersion + path,
RawQuery: fmt.Sprintf("namespace=%s&stage=%s&container=%s", ns, stage, container),
Scheme: "ws",
}
log.Infof("Path: %s", requestURL.String())
header := http.Header{
"Connection": []string{"Upgrade"},
"Upgrade": []string{"websocket"},
"Host": []string{host},
"Sec-Websocket-Key": []string{"SGVsbG8sIHdvcmxkIQ=="},
"Sec-Websocket-Version": []string{"13"},
}
filteredHeader := websocketutil.FilterHeader(header)
ws, _, err := websocket.DefaultDialer.Dial(requestURL.String(), filteredHeader)
if err != nil {
log.Errorf("Fail to new the WebSocket connection as %s", err.Error())
return err
}
defer ws.Close()
return watchLogs(ws, reader, close)
}
func watchLogs(ws *websocket.Conn, reader io.Reader, close chan struct{}) error {
//logFile, err := os.Open(filePath)
//if err != nil {
// log.Error(err.Error())
// return err
//}
//defer logFile.Close()
buf := bufio.NewReader(reader)
ticker := time.NewTicker(10 * time.Millisecond)
for {
select {
case <-ticker.C:
line, errRead := buf.ReadBytes('\n')
if errRead != nil {
if errRead == io.EOF {
continue
}
log.Errorf("watch log file errs: %v", errRead)
err := ws.WriteMessage(websocket.CloseMessage, []byte(errRead.Error()))
if err != nil {
log.Warningf("write close message error:%v", err)
}
return errRead
}
err := ws.WriteMessage(websocket.TextMessage, line)
if err != nil {
log.Warningf("write text message error:%v", err)
}
case <-close:
log.Info("Close the watch of log file")
return nil
}
}
}