forked from gojek/proctor
/
handler.go
105 lines (86 loc) · 2.65 KB
/
handler.go
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package logs
import (
"bufio"
"github.com/getsentry/raven-go"
"io"
"net/http"
"strings"
"github.com/gojektech/proctor/proctord/config"
"github.com/gojektech/proctor/proctord/kubernetes"
_logger "github.com/gojektech/proctor/proctord/logger"
"github.com/gojektech/proctor/proctord/utility"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
ReadBufferSize: config.LogsStreamReadBufferSize(),
WriteBufferSize: config.LogsStreamWriteBufferSize(),
}
type logger struct {
kubeClient kubernetes.Client
}
type Logger interface {
Stream() http.HandlerFunc
}
func NewLogger(kubeClient kubernetes.Client) Logger {
return &logger{
kubeClient: kubeClient,
}
}
func CloseWebSocket(message string, conn *websocket.Conn) {
err := conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, message))
if err != nil {
_logger.Error("Error closing connection with client after logs are read")
raven.CaptureError(err, nil)
}
return
}
func (l *logger) Stream() http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
conn, err := upgrader.Upgrade(w, req, nil)
if err != nil {
_logger.Error("Error upgrading connection to websocket protocol: ", err)
raven.CaptureError(err, nil)
w.WriteHeader(http.StatusBadRequest)
w.Write([]byte(utility.ClientError))
return
}
defer conn.Close()
jobName := strings.TrimLeft(req.URL.RawQuery, "job_name=")
if jobName == "" {
_logger.Error("No job name provided as part of URL: ", req.URL.RawQuery)
CloseWebSocket("No job name provided while requesting for logs", conn)
return
}
logStream, err := l.kubeClient.StreamJobLogs(jobName)
if err != nil {
_logger.Error("Error streaming logs from kube client: ", err)
raven.CaptureError(err, map[string]string{"job_name": jobName})
CloseWebSocket("Something went wrong", conn)
return
}
defer logStream.Close()
bufioReader := bufio.NewReader(logStream)
for {
jobLogSingleLine, _, err := bufioReader.ReadLine()
if err != nil {
if err == io.EOF {
_logger.Debug("Finished streaming logs for job: ", jobName)
CloseWebSocket("All logs are read", conn)
return
}
_logger.Error("Error reading from reader: ", err.Error())
raven.CaptureError(err, nil)
CloseWebSocket("Something went wrong", conn)
return
}
_logger.Debug("writing to web socket ", string(jobLogSingleLine[:]))
err = conn.WriteMessage(websocket.TextMessage, jobLogSingleLine[:])
if err != nil {
_logger.Error("Error writing logs to client: ", err)
raven.CaptureError(err, nil)
CloseWebSocket("Something went wrong", conn)
return
}
}
}
}