Some output tweaks; and some additional transition events upon resume (paused->unknown->{up|down})

cmd/maglevc/commands.go

@@ -5,8 +5,9 @@ package main
 import (
 	"context"
 	"fmt"
-	"text/tabwriter"
 	"os"
+	"strings"
+	"text/tabwriter"
 	"time"
 
 	"git.ipng.ch/ipng/vpp-maglev/internal/grpcapi"
@@ -195,16 +196,27 @@ func runShowBackend(ctx context.Context, client grpcapi.MaglevClient, args []str
 	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
 	fmt.Fprintf(w, "name\t%s\n", info.Name)
 	fmt.Fprintf(w, "address\t%s\n", info.Address)
-	fmt.Fprintf(w, "state\t%s\n", info.State)
+	stateDur := ""
+	if len(info.Transitions) > 0 {
+		since := time.Since(time.Unix(0, info.Transitions[0].AtUnixNs))
+		stateDur = " for " + formatDuration(since)
+	}
+	fmt.Fprintf(w, "state\t%s%s\n", info.State, stateDur)
 	fmt.Fprintf(w, "enabled\t%v\n", info.Enabled)
 	fmt.Fprintf(w, "weight\t%d\n", info.Weight)
 	fmt.Fprintf(w, "healthcheck\t%s\n", info.Healthcheck)
 	for i, t := range info.Transitions {
+		ts := time.Unix(0, t.AtUnixNs)
+		label := ""
 		if i == 0 {
-			fmt.Fprintf(w, "transitions\t%s → %s\n", t.From, t.To)
-		} else {
-			fmt.Fprintf(w, "\t%s → %s\n", t.From, t.To)
+			label = "transitions"
 		}
+		fmt.Fprintf(w, "%s\t%s → %s\t%s\t%s\n",
+			label,
+			t.From, t.To,
+			ts.Format("2006-01-02 15:04:05.000"),
+			formatAgo(time.Since(ts)),
+		)
 	}
 	return w.Flush()
 }
@@ -305,3 +317,38 @@ func runNotImplemented(_ context.Context, _ grpcapi.MaglevClient, _ []string) er
 	fmt.Println("not implemented yet")
 	return nil
 }
+
+// formatDuration formats a duration as Xd Xh Xm Xs without milliseconds.
+func formatDuration(d time.Duration) string {
+	if d < 0 {
+		d = 0
+	}
+	d = d.Truncate(time.Second)
+
+	days := int(d.Hours()) / 24
+	d -= time.Duration(days) * 24 * time.Hour
+	hours := int(d.Hours())
+	d -= time.Duration(hours) * time.Hour
+	minutes := int(d.Minutes())
+	d -= time.Duration(minutes) * time.Minute
+	seconds := int(d.Seconds())
+
+	var b strings.Builder
+	if days > 0 {
+		fmt.Fprintf(&b, "%dd", days)
+	}
+	if hours > 0 {
+		fmt.Fprintf(&b, "%dh", hours)
+	}
+	if minutes > 0 {
+		fmt.Fprintf(&b, "%dm", minutes)
+	}
+	if seconds > 0 || b.Len() == 0 {
+		fmt.Fprintf(&b, "%ds", seconds)
+	}
+	return b.String()
+}
+
+func formatAgo(d time.Duration) string {
+	return formatDuration(d) + " ago"
+}