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haproxy.go
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haproxy.go
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package command
import (
"encoding/json"
"flag"
"fmt"
"net/http"
"net/url"
"sort"
"strings"
"time"
"github.com/funkygao/columnize"
"github.com/funkygao/gafka/ctx"
"github.com/funkygao/gocli"
"github.com/funkygao/golib/gofmt"
"github.com/funkygao/golib/top"
)
type Haproxy struct {
Ui cli.Ui
Cmd string
zone string
svc string
}
func (this *Haproxy) Run(args []string) (exitCode int) {
var topMode bool
cmdFlags := flag.NewFlagSet("haproxy", flag.ContinueOnError)
cmdFlags.Usage = func() { this.Ui.Output(this.Help()) }
cmdFlags.StringVar(&this.zone, "z", ctx.DefaultZone(), "")
cmdFlags.StringVar(&this.svc, "svc", "", "")
cmdFlags.BoolVar(&topMode, "top", true, "")
if err := cmdFlags.Parse(args); err != nil {
return 1
}
zone := ctx.Zone(this.zone)
if topMode {
header, _ := this.getStats(zone.HaProxyStatsUri[0])
t := top.New(header, "%8s %4s %21s %21s %9s %6s %8s %12s %8s %8s %7s %7s %14s %6s")
go func() {
for {
rows := make([]string, 0)
for _, uri := range zone.HaProxyStatsUri {
_, r := this.getStats(uri)
rows = append(rows, r...)
}
t.Refresh(rows)
time.Sleep(time.Second * 3)
}
}()
if err := t.Start(); err != nil {
panic(err)
}
} else {
for _, uri := range zone.HaProxyStatsUri {
this.fetchStats(uri)
}
}
return
}
func (*Haproxy) Synopsis() string {
return "Query ehaproxy cluster for load stats"
}
func (this *Haproxy) getStats(statsUri string) (header string, rows []string) {
client := http.Client{Timeout: time.Second * 30}
resp, err := client.Get(statsUri)
swallow(err)
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
swallow(fmt.Errorf("fetch[%s] stats got status: %d", statsUri, resp.StatusCode))
}
var records map[string]map[string]int64
reader := json.NewDecoder(resp.Body)
err = reader.Decode(&records)
swallow(err)
u, err := url.Parse(statsUri)
swallow(err)
var shortHostname string
if strings.Contains(u.Host, ":") {
u.Host = u.Host[:strings.Index(u.Host, ":")]
}
tuples := strings.SplitN(u.Host, ".", 4)
if len(tuples) < 4 {
shortHostname = u.Host
} else {
shortHostname = tuples[3]
}
if len(shortHostname) > 8 {
shortHostname = shortHostname[:8]
}
sortedSvcs := make([]string, 0)
for svc := range records {
sortedSvcs = append(sortedSvcs, svc)
}
sort.Strings(sortedSvcs)
sortedCols := make([]string, 0)
for k := range records["pub"] {
sortedCols = append(sortedCols, k)
}
sort.Strings(sortedCols)
header = strings.Join(append([]string{"host", "svc"}, sortedCols...), "|")
for _, svc := range sortedSvcs {
if this.svc != "" && this.svc != svc {
continue
}
stats := records[svc]
var vals = []string{shortHostname, svc}
for _, k := range sortedCols {
v := stats[k]
vals = append(vals, gofmt.Comma(v))
}
rows = append(rows, strings.Join(vals, "|"))
}
return
}
func (this *Haproxy) fetchStats(statsUri string) {
client := http.Client{Timeout: time.Second * 30}
resp, err := client.Get(statsUri)
swallow(err)
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
swallow(fmt.Errorf("fetch[%s] stats got status: %d", statsUri, resp.StatusCode))
}
var records map[string]map[string]int64
reader := json.NewDecoder(resp.Body)
err = reader.Decode(&records)
swallow(err)
u, err := url.Parse(statsUri)
swallow(err)
this.Ui.Info(u.Host)
sortedSvcs := make([]string, 0)
for svc := range records {
sortedSvcs = append(sortedSvcs, svc)
}
sort.Strings(sortedSvcs)
sortedCols := make([]string, 0)
for k := range records["pub"] {
sortedCols = append(sortedCols, k)
}
sort.Strings(sortedCols)
lines := []string{strings.Join(append([]string{"svc"}, sortedCols...), "|")}
for _, svc := range sortedSvcs {
stats := records[svc]
var vals = []string{svc}
for _, k := range sortedCols {
v := stats[k]
vals = append(vals, gofmt.Comma(v))
}
lines = append(lines, strings.Join(vals, "|"))
}
this.Ui.Output(columnize.SimpleFormat(lines))
}
func (this *Haproxy) Help() string {
help := fmt.Sprintf(`
Usage: %s haproxy [options]
%s
Options:
-z zone
-svc name
Filter by svc name
-top
Top mode
`, this.Cmd, this.Synopsis())
return strings.TrimSpace(help)
}