feat: enhance EvoBGP with new command-line options for the evobgp-agent, including a watch command for periodic configuration updates. Update go.mod with additional dependencies and improve Docker Compose setup for new services, including NATS and various worker components.

internal/db/apply.go

@@ -0,0 +1,55 @@
+package db
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io/fs"
+	"path"
+	"sort"
+	"strings"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+// ApplyPostgresMigrations runs ordered *.up.sql from an embedded subtree (idempotent via schema_migrations).
+func ApplyPostgresMigrations(ctx context.Context, pool *pgxpool.Pool, fsys fs.FS, subdir string) error {
+	if _, err := pool.Exec(ctx, `CREATE TABLE IF NOT EXISTS schema_migrations (version TEXT NOT NULL PRIMARY KEY)`); err != nil {
+		return fmt.Errorf("db: schema_migrations: %w", err)
+	}
+	entries, err := fs.ReadDir(fsys, subdir)
+	if err != nil {
+		return err
+	}
+	var ups []string
+	for _, e := range entries {
+		if e.IsDir() || !strings.HasSuffix(e.Name(), ".up.sql") {
+			continue
+		}
+		ups = append(ups, e.Name())
+	}
+	sort.Strings(ups)
+	for _, name := range ups {
+		ver := strings.TrimSuffix(name, ".up.sql")
+		var dummy int
+		err := pool.QueryRow(ctx, `SELECT 1 FROM schema_migrations WHERE version = $1`, ver).Scan(&dummy)
+		if err == nil {
+			continue
+		}
+		if !errors.Is(err, pgx.ErrNoRows) {
+			return err
+		}
+		body, err := fs.ReadFile(fsys, path.Join(subdir, name))
+		if err != nil {
+			return err
+		}
+		if _, err := pool.Exec(ctx, string(body)); err != nil {
+			return fmt.Errorf("db: migrate %s: %w", name, err)
+		}
+		if _, err := pool.Exec(ctx, `INSERT INTO schema_migrations (version) VALUES ($1)`, ver); err != nil {
+			return err
+		}
+	}
+	return nil
+}