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server.go
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server.go
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package main
import (
"io/ioutil"
"log"
"net/http"
"os"
"strings"
"time"
"github.com/jpillora/go-realtime"
)
type Foo struct {
realtime.Object
Lines []string
}
func main() {
i := 0
const size = 1000
b, err := ioutil.ReadFile("data.txt")
if err != nil {
log.Fatal(err)
}
lines := strings.Split(string(b), "\n")
foo := &Foo{Lines: lines[i : size+i]}
//create a go-realtime (websockets) http.Handler
rt := realtime.NewHandler()
//register foo
rt.Add("foo", foo)
go func() {
for {
i++
if size+i == len(lines) {
break
}
foo.Lines = lines[i : size+i]
//mark updated
foo.Update()
//do other stuff...
time.Sleep(10 * time.Millisecond)
}
}()
//realtime handlers
http.Handle("/realtime", rt)
http.Handle("/realtime.js", realtime.JS)
//index handler
http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.Write(indexhtml)
})
port := os.Getenv("PORT")
if port == "" {
port = "3000"
}
log.Printf("Listening on localhost:%s...", port)
http.ListenAndServe(":"+port, nil)
}
var indexhtml = []byte(`
<pre id="out"></pre>
<script src="realtime.js"></script>
<script>
var foo = {};
var rt = realtime("/realtime");
//keep in sync with the server
rt.add("foo", foo, function onupdate() {
out.innerHTML = foo.Lines.join("\n");
});
</script>
`)
//NOTE: deltas are not sent in the example since the target object is too small