feat: enhance evobgp with new command-line tools for bundle management, including pull, verify, and apply functionalities. Update go.mod to include necessary dependencies and complete todos in architecture plan for improved observability and deployment practices.

internal/birdfmt/protocols.go

@@ -0,0 +1,52 @@
+package birdfmt
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"os/exec"
+	"strings"
+)
+
+// ShowProtocols runs `birdc [-s socket] show protocols all` and returns stdout (BIRD 2).
+func ShowProtocols(ctx context.Context, socket, birdcBin string) (string, error) {
+	if birdcBin == "" {
+		birdcBin = "birdc"
+	}
+	args := []string{"show", "protocols", "all"}
+	if s := strings.TrimSpace(socket); s != "" {
+		args = append([]string{"-s", s}, args...)
+	}
+	cmd := exec.CommandContext(ctx, birdcBin, args...)
+	var stdout, stderr bytes.Buffer
+	cmd.Stdout = &stdout
+	cmd.Stderr = &stderr
+	if err := cmd.Run(); err != nil {
+		msg := strings.TrimSpace(stderr.String())
+		if msg != "" {
+			return "", fmt.Errorf("birdc show protocols: %w: %s", err, msg)
+		}
+		return "", fmt.Errorf("birdc show protocols: %w", err)
+	}
+	return stdout.String(), nil
+}
+
+// CountEstablishedBGPSessions counts BGP protocol rows whose line contains "Established"
+// (heuristic for `birdc show protocols` / `show protocols all` output).
+func CountEstablishedBGPSessions(showProtocolsOutput string) int {
+	lines := strings.Split(showProtocolsOutput, "\n")
+	n := 0
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "name") || strings.HasPrefix(strings.ToLower(line), "table") {
+			continue
+		}
+		if !strings.Contains(strings.ToLower(line), "bgp") {
+			continue
+		}
+		if strings.Contains(strings.ToLower(line), "established") {
+			n++
+		}
+	}
+	return n
+}