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cmd/wol-proxy: show a loading page for / (#381)

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When requesting / wol-proxy will show a loading page that polls /status
every second. When the upstream server is ready the loading page will
refresh causing the actual root page to be displayed
This commit is contained in:
Benson Wong
2025-11-03 22:37:06 -05:00
committed by GitHub
parent b24467ab89
commit 6aedbe121a
3 changed files with 78 additions and 1 deletions
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2
CLAUDE.md
View File

@@ -11,7 +11,7 @@ llama-swap is a light weight, transparent proxy server that provides automatic m
## Testing
- `make test-dev` - Use this when making iterative changes. Runs `go test` and `staticcheck`. Fix any static checking errors.
- `make test-dev` - Use this when making iterative changes. Runs `go test` and `staticcheck`. Fix any static checking errors. Use this only when changes are made to any code under the `proxy/` directory
- `make test-all` - runs at the end before completing work. Includes long running concurrency tests.
## Workflow Tasks

64
cmd/wol-proxy/index.html Normal file
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@@ -0,0 +1,64 @@
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Loading...</title>
<style>
body {
font-family: sans-serif;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
margin: 0;
background: #f5f5f5;
}
.loader {
text-align: center;
}
.stats {
font-size: 18px;
color: #333;
margin: 20px 0;
}
.stats-label {
color: #666;
font-size: 14px;
}
</style>
</head>
<body>
<div class="loader">
<p>Waking up upstream server...</p>
<div class="stats">
<div><span class="stats-label">Time elapsed:</span> <span id="elapsed">0s</span></div>
<div><span id="attempts">&nbsp;</span></div>
</div>
</div>
<script>
var startTime = Date.now();
var attempts = 0;
setInterval(function() {
var elapsed = (Date.now() - startTime) / 1000;
document.getElementById('elapsed').textContent = elapsed.toFixed(1) + 's';
}, 100);
// Check status every second
setInterval(function() {
attempts++;
var dots = '.'.repeat((attempts % 10) || 10);
document.getElementById('attempts').textContent = dots;
fetch('/status')
.then(function(r) { return r.text(); })
.then(function(t) {
if (t.indexOf('status: ready') !== -1) {
location.reload();
}
})
.catch(function() {});
}, 1000);
</script>
</body>
</html>

13
cmd/wol-proxy/wol-proxy.go
View File

@@ -3,6 +3,7 @@ package main
import (
"bufio"
"context"
_ "embed"
"errors"
"flag"
"fmt"
@@ -19,6 +20,9 @@ import (
"time"
)
//go:embed index.html
var loadingPageHTML string
var (
flagMac = flag.String("mac", "", "mac address to send WoL packet to")
flagUpstream = flag.String("upstream", "", "upstream proxy address to send requests to")
@@ -230,6 +234,15 @@ func (p *proxyServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if err := sendMagicPacket(*flagMac); err != nil {
slog.Warn("failed to send magic WoL packet", "error", err)
}
// For root path requests, return loading page with status polling
if path == "/" {
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.WriteHeader(http.StatusOK)
fmt.Fprint(w, loadingPageHTML)
return
}
ticker := time.NewTicker(250 * time.Millisecond)
timeout, cancel := context.WithTimeout(context.Background(), time.Duration(*flagTimeout)*time.Second)
defer cancel()