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Connection.go
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Connection.go
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/*
* Copyright (c) 2020 Devtron Labs
*
* 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 sse
import (
"net/http"
"time"
)
type Connection struct {
request *http.Request
response http.ResponseWriter
createdTime time.Time
outboundMessage chan []byte
namespace string
}
func NewConnection(response http.ResponseWriter, request *http.Request, namespace string) *Connection {
conn := Connection{
request: request,
response: response,
createdTime: time.Now(),
outboundMessage: make(chan []byte, 256),
namespace: namespace,
}
return &conn
}
func (conn *Connection) BroadcastMessage(receive <-chan int) {
keepAliveTime := time.NewTicker(5 * time.Second)
keepAliveMsg := []byte(":keepalive\n")
defer keepAliveTime.Stop()
for {
select {
case msg, ok := <-conn.outboundMessage:
if !ok {
return
}
_, err := conn.response.Write(msg)
if err != nil {
return
}
if flusher, ok := conn.response.(http.Flusher); ok {
flusher.Flush()
}
case <-keepAliveTime.C:
_, err := conn.response.Write(keepAliveMsg)
if err != nil {
return
}
if flusher, ok := conn.response.(http.Flusher); ok {
flusher.Flush()
}
case <-conn.request.Context().Done():
return
case <-receive:
return
}
}
}