internal/cli/status.go
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package cli
import (
"bytes"
"flag"
"fmt"
"os"
"sort"
"strings"
"text/tabwriter"
"time"
"j3s.sh/cascade/api"
)
type statusCommand struct {
flagAPIAddr string
}
func (c statusCommand) Usage() {
fmt.Printf(`usage: cascade status [flags]
high-level overview of the cascade cluster: member counts,
status breakdown, and agent reachability.
flags:
-api
address of the cascade http api to target (default = 127.0.0.1:8500)
`)
}
func (c *statusCommand) Init(args []string) {
flags := flag.NewFlagSet("", flag.ContinueOnError)
flags.Usage = c.Usage
flags.StringVar(&c.flagAPIAddr, "api", "", "")
if err := flags.Parse(args); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func RunStatus(args []string) {
c := statusCommand{}
c.Init(args)
cfg := api.DefaultConfig()
if c.flagAPIAddr != "" {
cfg.Address = c.flagAPIAddr
}
client, err := api.NewClient(cfg)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
agent := client.Agent()
start := time.Now()
nodes, err := agent.Members()
apiRTT := time.Since(start)
if err != nil {
fmt.Printf("error fetching nodes from %s: %s\n", cfg.Address, err)
os.Exit(1)
}
self, err := agent.SelfTyped()
nodeName := "<unknown>"
var dnsAddr, httpAddr, serfAddr, dnsDomain string
if err == nil {
nodeName = self.Config.NodeName
dnsAddr = self.Config.DNSBindAddr
httpAddr = self.Config.HTTPBindAddr
serfAddr = self.Config.SerfBindAddr
dnsDomain = self.Config.DNSDomain
}
statusCounts := map[string]int{}
tagKeyCounts := map[string]int{}
for _, n := range nodes {
statusCounts[n.StatusPretty()]++
for k := range n.Tags {
tagKeyCounts[k]++
}
}
localServices, _ := agent.Services()
catalogServices, _ := client.Catalog().Services()
total := len(nodes)
alive := statusCounts["alive"]
healthPct := 0.0
if total > 0 {
healthPct = 100 * float64(alive) / float64(total)
}
var b bytes.Buffer
tw := tabwriter.NewWriter(&b, 0, 2, 2, ' ', 0)
fmt.Fprintln(tw, "cluster")
fmt.Fprintf(tw, " agent\t%s\n", nodeName)
fmt.Fprintf(tw, " api\t%s\n", cfg.Address)
fmt.Fprintf(tw, " api rtt\t%s\n", apiRTT.Round(time.Microsecond))
fmt.Fprintf(tw, " nodes\t%d\n", total)
fmt.Fprintf(tw, " health\t%.1f%% alive (%d/%d)\n", healthPct, alive, total)
fmt.Fprintln(tw)
if dnsAddr != "" || httpAddr != "" || serfAddr != "" {
fmt.Fprintln(tw, "bind addrs")
fmt.Fprintf(tw, " dns\t%s\n", dnsAddr)
fmt.Fprintf(tw, " http\t%s\n", httpAddr)
fmt.Fprintf(tw, " serf\t%s\n", serfAddr)
if dnsDomain != "" {
fmt.Fprintf(tw, " domain\t.%s\n", dnsDomain)
}
fmt.Fprintln(tw)
}
fmt.Fprintln(tw, "services")
fmt.Fprintf(tw, " local agent\t%s\n", summarizeLocalServices(localServices))
fmt.Fprintf(tw, " cluster\t%s\n", summarizeCatalog(catalogServices))
fmt.Fprintln(tw)
fmt.Fprintln(tw, "status")
for _, s := range sortedKeys(statusCounts) {
fmt.Fprintf(tw, " %s\t%d\n", s, statusCounts[s])
}
if len(tagKeyCounts) > 0 {
fmt.Fprintln(tw)
fmt.Fprintln(tw, "tags")
for _, k := range sortedKeys(tagKeyCounts) {
fmt.Fprintf(tw, " %s\t%d nodes\n", k, tagKeyCounts[k])
}
}
if err := tw.Flush(); err != nil {
fmt.Printf("error flushing tabwriter: %s", err)
os.Exit(1)
}
fmt.Print(b.String())
if alive < total {
os.Exit(1)
}
}
func sortedKeys(m map[string]int) []string {
out := make([]string, 0, len(m))
for k := range m {
out = append(out, k)
}
sort.Strings(out)
return out
}
func summarizeLocalServices(services map[string]*api.AgentService) string {
if len(services) == 0 {
return "none"
}
names := make([]string, 0, len(services))
for _, s := range services {
names = append(names, s.Service)
}
sort.Strings(names)
return fmt.Sprintf("%d (%s)", len(names), strings.Join(names, ", "))
}
func summarizeCatalog(services map[string][]string) string {
if len(services) == 0 {
return "none"
}
return fmt.Sprintf("%d unique services", len(services))
}