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server.go
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server.go
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/*
Copyright 2019 NetFoundry Inc.
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
https://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 console
import (
"github.com/sirupsen/logrus"
"golang.org/x/net/websocket"
"net/http"
)
func NewServer() *Server {
return &Server{
clients: make(map[int]*Client),
addCh: make(chan *Client),
delCh: make(chan *Client),
sendAllCh: make(chan *Message),
doneCh: make(chan struct{}),
errCh: make(chan error),
routers: make(map[string]bool),
links: make(map[string]*Link),
}
}
func (server *Server) Add(c *Client) {
server.addCh <- c
}
func (server *Server) Del(c *Client) {
server.delCh <- c
}
func (server *Server) Done() {
close(server.doneCh)
}
func (server *Server) SendAll(msg *Message) {
server.sendAllCh <- msg
}
func (server *Server) sendAll(msg *Message) {
for _, c := range server.clients {
c.Write(msg)
}
}
func (server *Server) Listen() {
logrus.Infof("listening")
onConnected := func(ws *websocket.Conn) {
defer func() {
if err := ws.Close(); err != nil {
server.errCh <- err
}
}()
client := NewClient(ws, server)
server.Add(client)
client.Listen()
}
http.Handle("/metrics", websocket.Handler(onConnected))
for {
select {
case client := <-server.addCh:
server.clients[client.id] = client
server.sendNetwork(client)
case client := <-server.delCh:
delete(server.clients, client.id)
case msg := <-server.sendAllCh:
server.sendAll(msg)
case err := <-server.errCh:
logrus.Errorf("error (%v)", err)
case <-server.doneCh:
return
}
}
}
func (server *Server) sendNetwork(c *Client) {
msg := &Message{}
for id := range server.routers {
msg.Routers = append(msg.Routers, id)
}
for _, link := range server.links {
msg.Links = append(msg.Links, link)
}
c.Write(msg)
}
type Server struct {
clients map[int]*Client
addCh chan *Client
delCh chan *Client
sendAllCh chan *Message
doneCh chan struct{}
errCh chan error
routers map[string]bool
links map[string]*Link
}