Add option to disable browser in HTTP mode (#462)

CONTRIBUTORS

 Hyoun Kyu Cho <netforce@google.com>
 Martin Spier <spiermar@gmail.com>
 Taco de Wolff <tacodewolff@gmail.com>
+Andrew Hunter <andrewhhunter@gmail.com>

internal/driver/cli.go

 	DiffBase  bool
 	Normalize bool
 
-	Seconds      int
-	Timeout      int
-	Symbolize    string
-	HTTPHostport string
-	Comment      string
+	Seconds            int
+	Timeout            int
+	Symbolize          string
+	HTTPHostport       string
+	HTTPDisableBrowser bool
+	Comment            string
 }
 
 // parseFlags parses the command lines through the specified flags package
 	flagMeanDelay := flag.Bool("mean_delay", false, "Display mean delay at each region")
 	flagTools := flag.String("tools", os.Getenv("PPROF_TOOLS"), "Path for object tool pathnames")
 
-	flagHTTP := flag.String("http", "", "Present interactive web based UI at the specified http host:port")
+	flagHTTP := flag.String("http", "", "Present interactive web UI at the specified http host:port")
+	flagNoBrowser := flag.Bool("no_browser", false, "Skip opening a browswer for the interactive web UI")
 
 	// Flags used during command processing
 	installedFlags := installFlags(flag)
 		return nil, nil, errors.New("-http is not compatible with an output format on the command line")
 	}
 
+	if *flagNoBrowser && *flagHTTP == "" {
+		return nil, nil, errors.New("-no_browser only makes sense with -http")
+	}
+
 	si := pprofVariables["sample_index"].value
 	si = sampleIndex(flagTotalDelay, si, "delay", "-total_delay", o.UI)
 	si = sampleIndex(flagMeanDelay, si, "delay", "-mean_delay", o.UI)
 	}
 
 	source := &source{
-		Sources:      args,
-		ExecName:     execName,
-		BuildID:      *flagBuildID,
-		Seconds:      *flagSeconds,
-		Timeout:      *flagTimeout,
-		Symbolize:    *flagSymbolize,
-		HTTPHostport: *flagHTTP,
-		Comment:      *flagAddComment,
+		Sources:            args,
+		ExecName:           execName,
+		BuildID:            *flagBuildID,
+		Seconds:            *flagSeconds,
+		Timeout:            *flagTimeout,
+		Symbolize:          *flagSymbolize,
+		HTTPHostport:       *flagHTTP,
+		HTTPDisableBrowser: *flagNoBrowser,
+		Comment:            *flagAddComment,
 	}
 
 	if err := source.addBaseProfiles(*flagBase, *flagDiffBase); err != nil {
 
 var usageMsgVars = "\n\n" +
 	"  Misc options:\n" +
-	"   -http              Provide web based interface at host:port.\n" +
+	"   -http              Provide web interface at host:port.\n" +
 	"                      Host is optional and 'localhost' by default.\n" +
 	"                      Port is optional and a randomly available port by default.\n" +
+	"   -no_browser        Skip opening a browser for the interactive web UI.\n" +
 	"   -tools             Search path for object tools\n" +
 	"\n" +
 	"  Legacy convenience options:\n" +

internal/driver/driver.go

 	}
 
 	if src.HTTPHostport != "" {
-		return serveWebInterface(src.HTTPHostport, p, o)
+		return serveWebInterface(src.HTTPHostport, p, o, src.HTTPDisableBrowser)
 	}
 	return interactive(p, o)
 }

internal/driver/webui.go

 	FlameGraph  template.JS
 }
 
-func serveWebInterface(hostport string, p *profile.Profile, o *plugin.Options) error {
+func serveWebInterface(hostport string, p *profile.Profile, o *plugin.Options, disableBrowser bool) error {
 	host, port, err := getHostAndPort(hostport)
 	if err != nil {
 		return err
 		},
 	}
 
-	if o.UI.WantBrowser() {
-		go openBrowser("http://"+args.Hostport, o)
+	url := "http://" + args.Hostport
+
+	o.UI.Print("Serving web UI on ", url)
+
+	if o.UI.WantBrowser() && !disableBrowser {
+		go openBrowser(url, o)
 	}
 	return server(args)
 }

internal/driver/webui_test.go

 		Obj:        fakeObjTool{},
 		UI:         &proftest.TestUI{},
 		HTTPServer: creator,
-	})
+	}, false)
 	<-serverCreated
 	defer server.Close()