feat: add pprof

plugin/debug/pkg/internal/driver/webhtml.go

@@ -0,0 +1,85 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package driver
+
+import (
+	"embed"
+	"fmt"
+	"html/template"
+	"os"
+	"sync"
+
+	"m7s.live/v5/plugin/debug/pkg/internal/report"
+)
+
+var (
+	htmlTemplates    *template.Template // Lazily loaded templates
+	htmlTemplateInit sync.Once
+)
+
+// getHTMLTemplates returns the set of HTML templates used by pprof,
+// initializing them if necessary.
+func getHTMLTemplates() *template.Template {
+	htmlTemplateInit.Do(func() {
+		htmlTemplates = template.New("templategroup")
+		addTemplates(htmlTemplates)
+		report.AddSourceTemplates(htmlTemplates)
+	})
+	return htmlTemplates
+}
+
+//go:embed html
+var embeddedFiles embed.FS
+
+// addTemplates adds a set of template definitions to templates.
+func addTemplates(templates *template.Template) {
+	// Load specified file.
+	loadFile := func(fname string) string {
+		data, err := embeddedFiles.ReadFile(fname)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "internal/driver: embedded file %q not found\n",
+				fname)
+			os.Exit(1)
+		}
+		return string(data)
+	}
+	loadCSS := func(fname string) string {
+		return `<style type="text/css">` + "\n" + loadFile(fname) + `</style>` + "\n"
+	}
+	loadJS := func(fname string) string {
+		return `<script>` + "\n" + loadFile(fname) + `</script>` + "\n"
+	}
+
+	// Define a named template with specified contents.
+	def := func(name, contents string) {
+		sub := template.New(name)
+		template.Must(sub.Parse(contents))
+		template.Must(templates.AddParseTree(name, sub.Tree))
+	}
+
+	// Embedded files.
+	def("css", loadCSS("html/common.css"))
+	def("header", loadFile("html/header.html"))
+	def("graph", loadFile("html/graph.html"))
+	def("graph_css", loadCSS("html/graph.css"))
+	def("script", loadJS("html/common.js"))
+	def("top", loadFile("html/top.html"))
+	def("sourcelisting", loadFile("html/source.html"))
+	def("plaintext", loadFile("html/plaintext.html"))
+	// TODO: Rename "stacks" to "flamegraph" to seal moving off d3 flamegraph.
+	def("stacks", loadFile("html/stacks.html"))
+	def("stacks_css", loadCSS("html/stacks.css"))
+	def("stacks_js", loadJS("html/stacks.js"))
+}