Merge pull request #4470 from influxdata/er-perf

Improve asset loading performance on low power devices

CHANGELOG.md

@@ -25,6 +25,7 @@
 1.  [#4449](https://github.com/influxdata/chronograf/pull/4449): Add ability to use single stat graph visualizations for flux query
 1.  [#4454](https://github.com/influxdata/chronograf/pull/4454): Save log line wrap/truncate preference
 1.  [#4461](https://github.com/influxdata/chronograf/pull/4461): Add ability to use table graph visualizations for flux query
+1.  [#4470](https://github.com/influxdata/chronograf/pull/4470): Add option to disable gzip compression
 
 
 ### UI Improvements

server/mux.go

@@ -33,6 +33,7 @@ type MuxOpts struct {
 	StatusFeedURL string            // JSON Feed URL for the client Status page News Feed
 	CustomLinks   map[string]string // Any custom external links for client's User menu
 	PprofEnabled  bool              // Mount pprof routes for profiling
+	DisableGZip   bool              // Optionally disable gzip.
 }
 
 // NewMux attaches all the route handlers; handler returned servers chronograf.
@@ -45,16 +46,20 @@ func NewMux(opts MuxOpts, service Service) http.Handler {
 		Logger:  opts.Logger,
 	})
 
+	if opts.Basepath != "" {
 		// Prefix any URLs found in the React assets with any configured basepath
-	prefixedAssets := NewDefaultURLPrefixer(opts.Basepath, assets, opts.Logger)
+		assets = NewDefaultURLPrefixer(opts.Basepath, assets, opts.Logger)
+	}
 
 	// Compress the assets with gzip if an accepted encoding
-	compressed := gziphandler.GzipHandler(prefixedAssets)
+	if !opts.DisableGZip {
+		assets = gziphandler.GzipHandler(assets)
+	}
 
 	// The react application handles all the routing if the server does not
 	// know about the route.  This means that we never have unknown routes on
 	// the server.
-	hr.NotFound = compressed
+	hr.NotFound = assets
 
 	var router chronograf.Router = hr
 

server/server.go

@@ -40,6 +40,7 @@ func init() {
 type Server struct {
 	Host        string `long:"host" description:"The IP to listen on" default:"0.0.0.0" env:"HOST"`
 	Port        int    `long:"port" description:"The port to listen on for insecure connections, defaults to a random value" default:"8888" env:"PORT"`
+	DisableGZip bool   `long:"disable-gzip" description:"Disables gzip compression, even if client requests it. Useful if running on a low-cpu device" env:"DISABLE_GZIP"`
 
 	PprofEnabled bool `long:"pprof-enabled" description:"Enable the /debug/pprof/* HTTP routes" env:"PPROF_ENABLED"`
 
@@ -376,6 +377,7 @@ func (s *Server) Serve(ctx context.Context) error {
 		StatusFeedURL: s.StatusFeedURL,
 		CustomLinks:   s.CustomLinks,
 		PprofEnabled:  s.PprofEnabled,
+		DisableGZip:   s.DisableGZip,
 	}, service)
 
 	// Add chronograf's version header to all requests