/
dashboard.go
217 lines (201 loc) · 6.06 KB
/
dashboard.go
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// Copyright 2017, The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.md file.
package main
import (
"bytes"
"io"
"net/http"
"sort"
"strconv"
"strings"
"time"
"github.com/dsnet/golib/unitconv"
)
func (zs *zsyncer) ServeHTTP() {
zs.log.Printf("starting http server")
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
var bb bytes.Buffer
defer func() { w.Write(bb.Bytes()) }()
bb.WriteString(`
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>ZSync Dashboard</title>
<style>body { font-family: monospace; } th, td { padding: 5px; } table, th, td { border: 1px solid black; }</style>
</head>
<body>
`[1:])
defer bb.WriteString("</body>\n</html>\n")
// Print pool statuses.
{
table := [][]string{{"Pool", "Status"}}
styles := make(map[[2]int]string)
var pools []string
for pool := range zs.poolMonitors {
pools = append(pools, pool)
}
sort.Strings(pools)
for _, pool := range pools {
var state, style string
switch zs.poolMonitors[pool].Status().State {
case +2:
state = "✅ HEALTHY"
style = "background-color:#d0ffd0;" // green
case +1:
state = "✅ HEALTHY"
style = "background-color:#ffffd0;" // yellow
case -1:
state = "❌ UNHEALTHY"
style = "background-color:#ffffd0;" // yellow
case -2:
state = "❌ UNHEALTHY"
style = "background-color:#ffd0d0;" // red
default:
state = "❓ UNKNOWN"
style = "background-color:#ffffd0;" // yellow
}
styles[[2]int{len(table), 1}] = style
table = append(table, []string{pool, state})
}
writeTable(&bb, table, styles)
}
io.WriteString(&bb, "<br>\n")
// Print snapshot statuses.
{
table := [][]string{{"Dataset", "Latest Snapshot"}}
styles := make(map[[2]int]string)
var ids []string
for id := range zs.snapshotManagers {
ids = append(ids, id)
}
sort.Strings(ids)
for _, id := range ids {
sm := zs.snapshotManagers[id]
srcLatest := sm.srcDataset.latestSnapshot.Load()
switch srcLatest {
case "":
styles[[2]int{len(table), 1}] = "background-color:#ffffd0;" // yellow
table = append(table, []string{id, "❓ UNKNOWN"})
default:
styles[[2]int{len(table), 1}] = "background-color:#d0ffd0;" // green
table = append(table, []string{id, "✅ " + srcLatest})
}
for i, dst := range sm.dstDatasets {
label := "├── " + dst.DatasetPath()
if i == len(sm.dstDatasets)-1 {
label = "└── " + dst.DatasetPath()
}
dstLatest := dst.latestSnapshot.Load()
switch dstLatest {
case "":
styles[[2]int{len(table), 1}] = "background-color:#ffffd0;" // yellow
table = append(table, []string{label, "❓ UNKNOWN"})
case srcLatest:
styles[[2]int{len(table), 1}] = "background-color:#d0ffd0;" // green
table = append(table, []string{label, "✅ " + dstLatest})
default:
styles[[2]int{len(table), 1}] = "background-color:#ffd0d0;" // red
table = append(table, []string{label, "❌ " + dstLatest})
}
}
}
writeTable(&bb, table, styles)
}
io.WriteString(&bb, "<br>\n")
// Print replication statuses.
{
table := [][]string{{"Started", "Source", "Destination", "Transferred", "Status"}}
styles := make(map[[2]int]string)
var ids []string
for id := range zs.replicaManagers {
ids = append(ids, id)
}
sort.Strings(ids)
for _, source := range ids {
for i, status := range zs.replicaManagers[source].Status() {
var started, transferred, state, style string
destination := zs.replicaManagers[source].dstDatasets[i].DatasetPath()
if !status.Started.IsZero() {
started = formatDate(status.Started)
var duration time.Duration
if status.Finished.IsZero() {
duration = time.Now().Sub(status.Started)
} else {
duration = status.Finished.Sub(status.Started)
}
transferred = unitconv.FormatPrefix(float64(status.Transferred), unitconv.IEC, 2) + "B at " +
unitconv.FormatPrefix(float64(status.Transferred)/duration.Seconds(), unitconv.IEC, 2) + "B/s"
switch {
case status.Finished.IsZero():
state = "❗ COPYING"
style = "background-color:#ffffd0;" // yellow
case status.FaultReason != "":
state = "❌ FAULT<pre>" + status.FaultReason + "</pre>"
style = "background-color:#ffd0d0;" // red
default:
state = "✅ FINISHED"
style = "background-color:#d0ffd0;" // green
}
}
styles[[2]int{len(table), 4}] = style
table = append(table, []string{started, source, destination, transferred, state})
}
}
writeTable(&bb, table, styles)
}
})
for {
if err := http.ListenAndServe(zs.http.Address, nil); err != nil {
zs.log.Printf("http.ListenAndServe error: %v", err)
time.Sleep(30 * time.Second)
}
}
}
func writeTable(w io.Writer, table [][]string, styles map[[2]int]string) {
io.WriteString(w, "<table>\n<tbody>\n")
defer io.WriteString(w, "</tbody>\n</table>\n")
for i, row := range table {
tag := "th"
if i > 0 {
tag = "td"
}
func() {
io.WriteString(w, "<tr>\n")
defer io.WriteString(w, "</tr>\n")
for j, column := range row {
style := styles[[2]int{i, j}]
if style != "" {
style = ` style="` + style + `"`
}
io.WriteString(w, "<"+tag+style+">"+column+"</"+tag+">\n")
}
}()
}
}
func formatDate(t time.Time) string {
suffix := "th"
switch t.Day() {
case 1, 21, 31:
suffix = "st"
case 2, 22:
suffix = "nd"
case 3, 23:
suffix = "rd"
}
var ago string
switch d := time.Now().Sub(t); {
case d < time.Second:
ago = d.Round(time.Millisecond).String()
case d < time.Minute:
ago = d.Round(time.Second).String()
case d < time.Hour:
ago = strings.TrimSuffix(d.Round(time.Minute).String(), "0s")
case d < 24*time.Hour:
ago = strings.TrimSuffix(d.Round(time.Hour).String(), "0m0s")
default:
ago = strconv.Itoa(int(d.Hours()/24)) + "days"
}
return t.Format("Jan 2"+suffix+", 3:04pm") + " (" + ago + " ago)"
}