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// 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.SpanContext.IsValid() {
return ""
}
col := "black"
if r.SpanContext.IsSampled() {
col = "blue"
}
tpl := fmt.Sprintf(
`trace_id: <b style="color:%s">%s</b> span_id: %s`,
col,
r.SpanContext.TraceID(),
r.SpanContext.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
}
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