Initial QSfera import

Server/vendor/go.opentelemetry.io/contrib/zpages/templates.go

@@ -0,0 +1,90 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+// Copyright 2017, OpenCensus Authors
+//
+// 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 zpages // import "go.opentelemetry.io/contrib/zpages"
+
+import (
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+
+	"go.opentelemetry.io/contrib/zpages/internal"
+)
+
+var (
+	templateFunctions = template.FuncMap{
+		"even":    even,
+		"spanRow": spanRowFormatter,
+	}
+	headerTemplate       = parseTemplate("header")
+	summaryTableTemplate = parseTemplate("summary")
+	tracesTableTemplate  = parseTemplate("traces")
+	footerTemplate       = parseTemplate("footer")
+)
+
+// headerData contains data for the header template.
+type headerData struct {
+	Title string
+}
+
+func parseTemplate(name string) *template.Template {
+	f, err := internal.Templates.Open("templates/" + name + ".html")
+	if err != nil {
+		log.Panicf("%v: %v", name, err) //nolint:revive  // Called during initialization.
+	}
+	defer func() {
+		if err = f.Close(); err != nil {
+			log.Panicf("%v: %v", name, err) //nolint:revive  // Called during initialization.
+		}
+	}()
+	text, err := io.ReadAll(f)
+	if err != nil {
+		log.Panicf("%v: %v", name, err) //nolint:revive  // Called during initialization.
+	}
+	return template.Must(template.New(name).Funcs(templateFunctions).Parse(string(text)))
+}
+
+func spanRowFormatter(r spanRow) template.HTML {
+	if !r.IsValid() {
+		return ""
+	}
+	col := "black"
+	if r.IsSampled() {
+		col = "blue"
+	}
+
+	tpl := fmt.Sprintf(
+		`trace_id: <b style="color:%s">%s</b> span_id: %s`,
+		col,
+		r.TraceID(),
+		r.SpanID(),
+	)
+	if r.ParentSpanContext.IsValid() {
+		tpl += fmt.Sprintf(` parent_span_id: %s`, r.ParentSpanContext.SpanID())
+	}
+
+	//nolint:gosec // G203: None of the dynamic attributes (TraceID/SpanID) can
+	// contain characters that need escaping so this lint issue is a false
+	// positive.
+	return template.HTML(tpl)
+}
+
+func even(x int) bool {
+	return x%2 == 0
+}