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writers.go
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/
writers.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package sysdump
import (
"bytes"
_ "embed"
"fmt"
"html/template"
"os"
"sort"
"strings"
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/cli-runtime/pkg/printers"
"k8s.io/client-go/kubernetes/scheme"
)
//go:embed eventSummary.html
var eventSummaryHTML string
func writeBytes(p string, b []byte) error {
return os.WriteFile(p, b, fileMode)
}
func writeString(p, v string) error {
return writeBytes(p, []byte(v))
}
func writeTable(p string, o *metav1.Table) error {
var b bytes.Buffer
if err := printers.NewTablePrinter(printers.PrintOptions{
Wide: true,
WithNamespace: true,
}).PrintObj(o, &b); err != nil {
return err
}
return writeString(p, b.String())
}
func writeYaml(p string, o runtime.Object) error {
var j printers.YAMLPrinter
w, err := printers.NewTypeSetter(scheme.Scheme).WrapToPrinter(&j, nil)
if err != nil {
return err
}
var b bytes.Buffer
if err := w.PrintObj(o, &b); err != nil {
return err
}
return writeString(p, b.String())
}
// writeEventTable writes a html summary of cluster events.
func makeEventTable(events []corev1.Event) []byte {
// sort events by time
sort.Slice(events, func(i, j int) bool {
return events[i].LastTimestamp.Time.Before(events[j].LastTimestamp.Time)
})
t := template.Must(template.New("events").Funcs(template.FuncMap{
"formatTime": func(created, firstSeen, lastSeen metav1.Time, count int32) template.HTML {
countMsg := ""
if count > 1 {
countMsg = fmt.Sprintf(" <small>(x%d)</small>", count)
}
if lastSeen.IsZero() {
lastSeen = created
}
firstSeenUTC := firstSeen.In(time.UTC)
lastSeenUTC := lastSeen.In(time.UTC)
//nolint:gosec
return template.HTML(fmt.Sprintf(`<time datetime="%s" title="First Seen: %s">%s</time>%s`, lastSeenUTC.String(), firstSeenUTC.Format("15:04:05Z"), lastSeenUTC.Format("15:04:05Z"), countMsg))
},
"reasonClass": func(r string) template.HTMLAttr {
cssClass := "text-muted"
switch {
case strings.Contains(strings.ToLower(r), "fail"),
strings.Contains(strings.ToLower(r), "error"),
strings.Contains(strings.ToLower(r), "kill"),
strings.Contains(strings.ToLower(r), "backoff"):
cssClass = "text-danger"
case strings.Contains(strings.ToLower(r), "notready"),
strings.Contains(strings.ToLower(r), "unhealthy"),
strings.Contains(strings.ToLower(r), "missing"):
cssClass = "text-warning"
}
//nolint:gosec
return template.HTMLAttr(fmt.Sprintf(`class="%s"`, cssClass))
},
}).Parse(eventSummaryHTML))
out := bytes.NewBuffer([]byte{})
if err := t.Execute(out, events); err != nil {
panic(err) // unreachable
}
return out.Bytes()
}