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server.go
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server.go
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package gaelv
import (
"fmt"
"html/template"
"log"
"net/http"
"strings"
)
type SSEServer struct {
connected chan chan *RequestLog
disconnected chan chan *RequestLog
clients map[chan *RequestLog]bool
Logc chan *RequestLog
provider *Provider
}
func NewSSEServer(provider *Provider) *SSEServer {
return &SSEServer{
connected: make(chan (chan *RequestLog)),
disconnected: make(chan (chan *RequestLog)),
clients: make(map[chan *RequestLog]bool),
Logc: make(chan *RequestLog),
provider: provider,
}
}
func (s *SSEServer) Start() {
go func() {
for {
select {
case client := <-s.connected:
s.clients[client] = true
log.Println("client connected")
// send latest logs to the connected client
logs, err := s.provider.GetLatestLogs(100)
if err != nil {
log.Fatal(err)
}
for _, l := range logs {
client <- l
}
case client := <-s.disconnected:
delete(s.clients, client)
close(client)
log.Println("client disconnected")
case l := <-s.Logc:
if len(s.clients) > 0 {
for client, _ := range s.clients {
client <- l
}
log.Println("sent new log")
}
}
}
}()
}
func (s *SSEServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("Connection", "keep-alive")
w.Header().Set("Cache-Control", "no-cache")
c := make(chan *RequestLog)
s.connected <- c
notify := w.(http.CloseNotifier).CloseNotify()
go func() {
<-notify
s.disconnected <- c
}()
for {
l, ok := <-c
if !ok {
// client disconnected
break
}
fmt.Fprintf(w, "data: %s\n\n", l.ToJSON())
w.(http.Flusher).Flush()
}
}
func IndexHandler(w http.ResponseWriter, r *http.Request) {
if strings.HasPrefix(r.URL.Path, "/static/") {
data, err := Asset(strings.TrimLeft(r.URL.Path, "/"))
if err != nil {
w.WriteHeader(http.StatusNotFound)
return
}
if strings.HasSuffix(r.URL.Path, "css") {
w.Header().Set("Content-Type", "text/css; charset=utf-8")
}
if strings.HasSuffix(r.URL.Path, "js") {
w.Header().Set("Content-Type", "application/javascript")
}
fmt.Fprintln(w, string(data))
return
}
if r.URL.Path != "/" {
w.WriteHeader(http.StatusNotFound)
return
}
data, err := Asset("templates/index.html")
if err != nil {
log.Fatal(err)
}
t, err := template.New("").Parse(string(data))
if err != nil {
log.Fatalf("error parsing template: %s", err)
}
err = t.Execute(w, nil)
if err != nil {
log.Fatalf("error creating html: %s", err)
}
}