Serve expvars and pprof on the API port

cmd/ipfs/daemon.go

 package main
 
 import (
+	_ "expvar"
 	"fmt"
+	"net/http"
+	_ "net/http/pprof"
 	"os"
 	"strings"
 
@@ -76,6 +79,17 @@ the port as you would other services or database (firewall, authenticated proxy,
 	Run:         daemonFunc,
 }
 
+// defaultMux tells mux to serve path using the default muxer. This is
+// mostly useful to hook up things that register in the default muxer,
+// and don't provide a convenient http.Handler entry point, such as
+// expvar and http/pprof.
+func defaultMux(path string) func(node *core.IpfsNode, mux *http.ServeMux) (*http.ServeMux, error) {
+	return func(node *core.IpfsNode, mux *http.ServeMux) (*http.ServeMux, error) {
+		mux.Handle(path, http.DefaultServeMux)
+		return mux, nil
+	}
+}
+
 func daemonFunc(req cmds.Request, res cmds.Response) {
 	// let the user know we're going.
 	fmt.Printf("Initializing daemon...\n")
@@ -281,6 +295,8 @@ func daemonFunc(req cmds.Request, res cmds.Response) {
 		corehttp.WebUIOption,
 		gateway.ServeOption(),
 		corehttp.VersionOption(),
+		defaultMux("/debug/vars"),
+		defaultMux("/debug/pprof/"),
 	}
 
 	if rootRedirect != nil {