Add on-demand pprof profiling grouped by route

Expose pprof at /debug/pprof via -pprof flag, tag each handler with runtime/pprof route label, add handleRoute helper to avoid repeating patterns, and document UI workflow in README.

1 files changed, 9 insertions, 5 deletions

diff --git a/cli/cli.go b/cli/cli.go
index 68a86a6..bd54b35 100644
--- a/cli/cli.go
+++ b/cli/cli.go
@@ -21,10 +21,11 @@ import (
 )
 
 var (
-	fetchOSM   = flag.Bool("fetch-osm", false, "download the France OSM PBF (resumable) into france-latest.osm.pbf")
-	extractOSM = flag.String("extract-osm", "", "extract mountain passes from an OSM PBF file into the database")
-	backfill   = flag.Bool("backfill", false, "recompute all stored ride values")
-	backtest   = flag.Bool("backtest", false, "run data benchmarks comparing computed values against stored reference values")
+	fetchOSM    = flag.Bool("fetch-osm", false, "download the France OSM PBF (resumable) into france-latest.osm.pbf")
+	extractOSM  = flag.String("extract-osm", "", "extract mountain passes from an OSM PBF file into the database")
+	backfill    = flag.Bool("backfill", false, "recompute all stored ride values")
+	backtest    = flag.Bool("backtest", false, "run data benchmarks comparing computed values against stored reference values")
+	enablePprof = flag.Bool("pprof", false, "expose pprof endpoints at /debug/pprof")
 )
 
 const (
@@ -52,7 +53,10 @@ func Run(db *sql.DB, configPath string, appConfig config.Config) {
 }
 
 func runServer(db *sql.DB, configPath string, appConfig config.Config) {
-	server := web.NewServer(db, configPath)
+	server := web.NewServer(db, configPath).WithPprof(*enablePprof)
+	if *enablePprof {
+		slog.Info("pprof enabled", "endpoint", appConfig.Server.PublicURL+"/debug/pprof/")
+	}
 	slog.Info("Starting web server", "address", appConfig.Server.PublicURL)
 	kcore.Expect(server.ListenAndServe(appConfig.Server.Address), "web server stopped")
 }