refactor: remove web flamegrapher and keep TUI-only

author: Paul Buetow <paul@buetow.org> 2026-03-06 15:35:24 +0200
committer: Paul Buetow <paul@buetow.org> 2026-03-06 15:35:24 +0200
commit: 99b02bf8c389a793df5d5986db05eed7e459f7b1 (patch)
tree: bc4e36cfcd3c9ef9b067beed2eb5b68a75a45aa2 /internal/flamegraph/webserver.go
parent: 4ff17c30120d657b966f8a55188ba167dc875e64 (diff)
1 files changed, 0 insertions, 199 deletions
diff --git a/internal/flamegraph/webserver.go b/internal/flamegraph/webserver.go
deleted file mode 100644
index c472dfb..0000000
--- a/internal/flamegraph/webserver.go
+++ /dev/null
@@ -1,199 +0,0 @@
-package flamegraph
-
-import (
-	"context"
-	"fmt"
-	"net"
-	"net/http"
-	"os"
-	"os/signal"
-	"path/filepath"
-	"strings"
-	"syscall"
-	"time"
-)
-
-type serverTimeouts struct {
-	readTimeout  time.Duration
-	writeTimeout time.Duration
-	idleTimeout  time.Duration
-}
-
-var defaultServerTimeouts = serverTimeouts{
-	readTimeout:  10 * time.Second,
-	writeTimeout: 30 * time.Second,
-	idleTimeout:  60 * time.Second,
-}
-
-// ServeSVG starts a small HTTP server that serves a single flamegraph SVG.
-//
-// It prints a URL of the form http://HOSTNAME:PORT/abs/path/to.svg and blocks until
-// the user presses Ctrl+C or the process receives SIGTERM, at which point the server
-// is shut down gracefully.
-func ServeSVG(svgFile string) error {
-	absPath, err := filepath.Abs(svgFile)
-	if err != nil {
-		return fmt.Errorf("resolve svg path: %w", err)
-	}
-	urlPath := buildURLPath(absPath)
-	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer stop()
-	return runServer(ctx, buildSVGHandler(absPath, urlPath), defaultServerTimeouts, func(hostname string, port int) {
-		printServerURL(hostname, port, urlPath)
-	})
-}
-
-// ServeSVGAutoReload serves an SVG viewer page that periodically reloads the SVG.
-//
-// The SVG file itself is still served directly at its absolute URL path, while "/"
-// serves a small HTML wrapper that appends a cache-busting query parameter on each
-// refresh interval to pick up newly written SVG content.
-func ServeSVGAutoReload(svgFile string, refreshInterval time.Duration) error {
-	if refreshInterval <= 0 {
-		return fmt.Errorf("refresh interval must be > 0")
-	}
-
-	absPath, err := filepath.Abs(svgFile)
-	if err != nil {
-		return fmt.Errorf("resolve svg path: %w", err)
-	}
-	urlPath := buildURLPath(absPath)
-	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer stop()
-
-	mux := buildSVGAutoReloadHandler(absPath, urlPath, refreshInterval)
-	return runServer(ctx, mux, defaultServerTimeouts, func(hostname string, port int) {
-		printServerURL(hostname, port, "/")
-	})
-}
-
-func buildURLPath(absPath string) string {
-	urlPath := filepath.ToSlash(absPath)
-	if !strings.HasPrefix(urlPath, "/") {
-		return "/" + urlPath
-	}
-	return urlPath
-}
-
-func buildSVGHandler(absPath, urlPath string) *http.ServeMux {
-	mux := http.NewServeMux()
-	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		http.Redirect(w, r, urlPath, http.StatusFound)
-	})
-	mux.HandleFunc(urlPath, func(w http.ResponseWriter, r *http.Request) {
-		http.ServeFile(w, r, absPath)
-	})
-	return mux
-}
-
-func buildSVGAutoReloadHandler(absPath, urlPath string, refreshInterval time.Duration) *http.ServeMux {
-	intervalMs := refreshInterval.Milliseconds()
-	mux := http.NewServeMux()
-	mux.HandleFunc("/", func(w http.ResponseWriter, _ *http.Request) {
-		w.Header().Set("Content-Type", "text/html; charset=utf-8")
-		_, _ = fmt.Fprintf(w, `<!doctype html>
-<html>
-<head>
-  <meta charset="utf-8"/>
-  <meta name="viewport" content="width=device-width, initial-scale=1"/>
-  <title>I/O Flamegraph (Auto-Reload)</title>
-  <style>
-    body { margin: 0; font-family: monospace; }
-    .bar { padding: 8px 12px; border-bottom: 1px solid #ddd; }
-    .viewer { width: 100%%; height: calc(100vh - 42px); border: 0; display: block; }
-  </style>
-</head>
-<body>
-  <div class="bar">
-    Auto-refresh every %d ms.
-    <button type="button" onclick="refreshNow()">Refresh now</button>
-  </div>
-  <iframe id="fg" class="viewer" src="%s"></iframe>
-  <script>
-    const base = %q;
-    function refreshNow() {
-      document.getElementById("fg").src = base + "?t=" + Date.now();
-    }
-    setInterval(refreshNow, %d);
-  </script>
-</body>
-</html>
-`, intervalMs, urlPath, urlPath, intervalMs)
-	})
-	mux.HandleFunc(urlPath, func(w http.ResponseWriter, r *http.Request) {
-		http.ServeFile(w, r, absPath)
-	})
-	return mux
-}
-
-func listenRandomPort() (net.Listener, error) {
-	listener, err := net.Listen("tcp", ":0")
-	if err != nil {
-		return nil, fmt.Errorf("start web server: %w", err)
-	}
-	return listener, nil
-}
-
-func serverHostPort(listener net.Listener) (string, int) {
-	hostname, err := os.Hostname()
-	if err != nil {
-		hostname = "localhost"
-	}
-	port := listener.Addr().(*net.TCPAddr).Port
-	return hostname, port
-}
-
-func printServerURL(hostname string, port int, urlPath string) {
-	fmt.Printf("Flamegraph available at http://%s:%d%s\n", hostname, port, urlPath)
-	fmt.Println("Press Ctrl+C to stop the web server.")
-}
-
-func newHTTPServer(mux *http.ServeMux, timeouts serverTimeouts) *http.Server {
-	return &http.Server{
-		Handler:      mux,
-		ReadTimeout:  timeouts.readTimeout,
-		WriteTimeout: timeouts.writeTimeout,
-		IdleTimeout:  timeouts.idleTimeout,
-	}
-}
-
-func runServer(ctx context.Context, mux *http.ServeMux, timeouts serverTimeouts, printURL func(hostname string, port int)) error {
-	srv := newHTTPServer(mux, timeouts)
-
-	listener, err := listenRandomPort()
-	if err != nil {
-		return err
-	}
-	defer listener.Close()
-
-	hostname, port := serverHostPort(listener)
-	if printURL != nil {
-		printURL(hostname, port)
-	}
-
-	errCh := make(chan error, 1)
-	go func() {
-		errCh <- srv.Serve(listener)
-	}()
-
-	select {
-	case <-ctx.Done():
-	case serveErr := <-errCh:
-		if serveErr != nil && serveErr != http.ErrServerClosed {
-			return serveErr
-		}
-		return nil
-	}
-
-	shutdownCtx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
-	defer cancel()
-	if err := srv.Shutdown(shutdownCtx); err != nil {
-		return fmt.Errorf("shutdown web server: %w", err)
-	}
-
-	serveErr := <-errCh
-	if serveErr != nil && serveErr != http.ErrServerClosed {
-		return serveErr
-	}
-	return nil
-}
author	Paul Buetow <paul@buetow.org>	2026-03-06 15:35:24 +0200
committer	Paul Buetow <paul@buetow.org>	2026-03-06 15:35:24 +0200
commit	99b02bf8c389a793df5d5986db05eed7e459f7b1 (patch)
tree	bc4e36cfcd3c9ef9b067beed2eb5b68a75a45aa2 /internal/flamegraph/webserver.go
parent	4ff17c30120d657b966f8a55188ba167dc875e64 (diff)