internal/debug: show new View information in the debug page

Add View Type, EnvOverlay, and Root to the view debug page. Also inline
the View debug page into the Session debug page, to save a click.

For golang/go#57979

Change-Id: Id6fbf86a55329078adcada049e34607ee918da11
Reviewed-on: https://go-review.googlesource.com/c/tools/+/555197
Auto-Submit: Robert Findley <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Alan Donovan <[email protected]>

gopls/internal/debug/serve.go

@@ -462,7 +462,6 @@ func (i *Instance) Serve(ctx context.Context, addr string) (string, error) {
 		mux.HandleFunc("/analysis/", render(AnalysisTmpl, i.getAnalysis))
 		mux.HandleFunc("/cache/", render(CacheTmpl, i.getCache))
 		mux.HandleFunc("/session/", render(SessionTmpl, i.getSession))
-		mux.HandleFunc("/view/", render(ViewTmpl, i.getView))
 		mux.HandleFunc("/client/", render(ClientTmpl, i.getClient))
 		mux.HandleFunc("/server/", render(ServerTmpl, i.getServer))
 		mux.HandleFunc("/file/", render(FileTmpl, i.getFile))
@@ -644,12 +643,17 @@ var BaseTemplate = template.Must(template.New("").Parse(`
 	width:6rem;
 }
 td.value {
-  text-align: right;
+	text-align: right;
 }
 ul.spans {
 	font-family: monospace;
 	font-size:   85%;
 }
+body {
+	font-family: sans-serif;
+	font-size: 1rem;
+	line-height: normal;
+}
 </style>
 {{block "head" .}}{{end}}
 </head>
@@ -674,7 +678,6 @@ Unknown page
 {{define "clientlink"}}<a href="/client/{{.}}">Client {{.}}</a>{{end}}
 {{define "serverlink"}}<a href="/server/{{.}}">Server {{.}}</a>{{end}}
 {{define "sessionlink"}}<a href="/session/{{.}}">Session {{.}}</a>{{end}}
-{{define "viewlink"}}<a href="/view/{{.}}">View {{.}}</a>{{end}}
 `)).Funcs(template.FuncMap{
 	"fuint64":  fuint64,
 	"fuint32":  fuint32,
@@ -706,7 +709,7 @@ Unknown page
 })
 
 var MainTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
-{{define "title"}}GoPls server information{{end}}
+{{define "title"}}Gopls server information{{end}}
 {{define "body"}}
 <h2>Caches</h2>
 <ul>{{range .State.Caches}}<li>{{template "cachelink" .ID}}</li>{{end}}</ul>
@@ -722,7 +725,7 @@ var MainTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
 `))
 
 var InfoTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
-{{define "title"}}GoPls version information{{end}}
+{{define "title"}}Gopls version information{{end}}
 {{define "body"}}
 {{.}}
 {{end}}
@@ -771,6 +774,13 @@ var CacheTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
 {{define "body"}}
 <h2>memoize.Store entries</h2>
 <ul>{{range $k,$v := .MemStats}}<li>{{$k}} - {{$v}}</li>{{end}}</ul>
+<h2>File stats</h2>
+<p>
+{{- $stats := .FileStats -}}
+Total: <b>{{$stats.Total}}</b><br>
+Largest: <b>{{$stats.Largest}}</b><br>
+Errors: <b>{{$stats.Errs}}</b><br>
+</p>
 {{end}}
 `))
 
@@ -806,7 +816,16 @@ var SessionTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
 {{define "body"}}
 From: <b>{{template "cachelink" .Cache.ID}}</b><br>
 <h2>Views</h2>
-<ul>{{range .Views}}<li>{{.Folder.Name}} is {{template "viewlink" .ID}} in {{.Folder.Dir}}</li>{{end}}</ul>
+<ul>{{range .Views}}
+{{- $envOverlay := .EnvOverlay -}}
+<li>ID: <b>{{.ID}}</b><br>
+Type: <b>{{.Type}}</b><br>
+Root: <b>{{.Root}}</b><br>
+{{- if $envOverlay}}
+Env overlay: <b>{{$envOverlay}})</b><br>
+{{end -}}
+Folder: <b>{{.Folder.Name}}:{{.Folder.Dir}}</b></li>
+{{end}}</ul>
 <h2>Overlays</h2>
 {{$session := .}}
 <ul>{{range .Overlays}}
@@ -816,14 +835,6 @@ From: <b>{{template "cachelink" .Cache.ID}}</b><br>
 {{end}}
 `))
 
-var ViewTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
-{{define "title"}}View {{.ID}}{{end}}
-{{define "body"}}
-Name: <b>{{.Folder.Name}}</b><br>
-Folder: <b>{{.Folder.Dir}}</b><br>
-{{end}}
-`))
-
 var FileTmpl = template.Must(template.Must(BaseTemplate.Clone()).Parse(`
 {{define "title"}}Overlay {{.Identity.Hash}}{{end}}
 {{define "body"}}

gopls/internal/debug/template_test.go

@@ -36,7 +36,6 @@ var templates = map[string]struct {
 	"TraceTmpl":    {debug.TraceTmpl, debug.TraceResults{}},
 	"CacheTmpl":    {debug.CacheTmpl, &cache.Cache{}},
 	"SessionTmpl":  {debug.SessionTmpl, &cache.Session{}},
-	"ViewTmpl":     {debug.ViewTmpl, &cache.View{}},
 	"ClientTmpl":   {debug.ClientTmpl, &debug.Client{}},
 	"ServerTmpl":   {debug.ServerTmpl, &debug.Server{}},
 	"FileTmpl":     {debug.FileTmpl, &cache.Overlay{}},

gopls/internal/lsp/cache/cache.go

@@ -11,6 +11,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"golang.org/x/tools/gopls/internal/lsp/command"
 	"golang.org/x/tools/gopls/internal/lsp/protocol"
 	"golang.org/x/tools/internal/event"
 	"golang.org/x/tools/internal/gocommand"
@@ -76,6 +77,7 @@ func (c *Cache) MemStats() map[reflect.Type]int { return c.store.Stats() }
 
 // FileStats returns information about the set of files stored in the cache.
 // It is intended for debugging only.
-func (c *Cache) FileStats() (files, largest, errs int) {
-	return c.fileStats()
+func (c *Cache) FileStats() (stats command.FileStats) {
+	stats.Total, stats.Largest, stats.Errs = c.fileStats()
+	return
 }

gopls/internal/server/command.go

@@ -1052,7 +1052,7 @@ func (c *commandHandler) MemStats(ctx context.Context) (command.MemStatsResult,
 // about the current state of the loaded workspace for the current session.
 func (c *commandHandler) WorkspaceStats(ctx context.Context) (command.WorkspaceStatsResult, error) {
 	var res command.WorkspaceStatsResult
-	res.Files.Total, res.Files.Largest, res.Files.Errs = c.s.session.Cache().FileStats()
+	res.Files = c.s.session.Cache().FileStats()
 
 	for _, view := range c.s.session.Views() {
 		vs, err := collectViewStats(ctx, view)

gopls/internal/test/integration/debug/debug_test.go

@@ -65,7 +65,7 @@ func TestStartDebugging(t *testing.T) {
 		if err != nil {
 			t.Fatalf("reading HTTP response body: %v", err)
 		}
-		const want = "<title>GoPls"
+		const want = "<title>Gopls"
 		if !strings.Contains(string(data), want) {
 			t.Errorf("GET %s response does not contain %q: <<%s>>", debugURL, want, data)
 		}