feat: 实现配置校验与运维命令及优雅停机

cmd/nixmsg/healthcheck.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+func cmdHealthcheck(_ []string) error {
+	cfg, err := loadAndValidateConfig()
+	if err != nil {
+		return err
+	}
+	addrBytes, err := os.ReadFile(filepath.Join(cfg.DataDir, "listen.addr"))
+	if err != nil {
+		return fmt.Errorf("read listen.addr: %w", err)
+	}
+	addr := strings.TrimSpace(string(addrBytes))
+	if addr == "" {
+		return fmt.Errorf("listen.addr is empty")
+	}
+	url := "http://" + addr + "/healthz"
+	client := &http.Client{Timeout: 5 * time.Second}
+	resp, err := client.Get(url)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = resp.Body.Close() }()
+	body, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("healthz status %d: %s", resp.StatusCode, strings.TrimSpace(string(body)))
+	}
+	return nil
+}