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Merged
deadprogram merged 1 commit into from
Apr 25, 2026
Merged

examples: improve webserver example to use less memory #36

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2 changes: 0 additions & 2 deletions examples/webserver/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,6 @@
</head>
<body><div class="c">
<h1>TinyGo HTTP Server</h1>
<p>access: {{ACCESS}}</p>

<ul class="links">
<li><a href="/hello">/hello</a></li>
<li><a href="/6">/6 (Tetris)</a></li>
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51 changes: 3 additions & 48 deletions examples/webserver/webserver.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,23 +22,6 @@ var indexHTML string
//go:embed sixlines.html
var sixlinesHTML string

// indexBefore and indexAfter are the two halves of index.html split at the
// access counter insertion point. Populated by init().
var indexBefore, indexAfter string

const accessMarker = "{{ACCESS}}"

func init() {
for i := 0; i <= len(indexHTML)-len(accessMarker); i++ {
if indexHTML[i:i+len(accessMarker)] == accessMarker {
indexBefore = indexHTML[:i]
indexAfter = indexHTML[i+len(accessMarker):]
return
}
}
indexBefore = indexHTML
}

var (
ssid string
password string
Expand All @@ -49,10 +32,7 @@ func main() {
// wait a bit for serial
time.Sleep(2 * time.Second)

link := link.Esplink{
// link needs a 48k arena pool to handle the blob allocations for WiFi.
ArenaPoolSize: 48 * 1024,
}
link := link.Esplink{}
netdev.UseNetdev(&link)

println("Connecting to WiFi...")
Expand Down Expand Up @@ -88,37 +68,12 @@ func logRequest(h http.HandlerFunc) http.Handler {
}

func root(w http.ResponseWriter, r *http.Request) {
access := 1

cookie, err := r.Cookie("access")
if err != nil {
if err == http.ErrNoCookie {
cookie = &http.Cookie{
Name: "access",
Value: "1",
}
} else {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
} else {
v, err := strconv.ParseInt(cookie.Value, 10, 0)
if err != nil {
http.Error(w, "invalid cookie.Value : "+cookie.Value, http.StatusBadRequest)
return
}
cookie.Value = strconv.Itoa(int(v) + 1)
access = int(v) + 1
}
http.SetCookie(w, cookie)
w.WriteHeader(http.StatusOK)

io.WriteString(w, indexBefore)
io.WriteString(w, strconv.Itoa(access))
io.WriteString(w, indexAfter)
io.WriteString(w, indexHTML)
}

func sixlines(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
io.WriteString(w, sixlinesHTML)
}

Expand Down
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