optimize: DNS查询日志增加cost。

packages/mitmproxy/src/lib/dns/https.js

@@ -38,22 +38,23 @@ module.exports = class DNSOverHTTPS extends BaseDNS {
     }
 
     // 未预设当前域名的IP列表，则从dns服务器获取
+    const start = new Date()
     try {
       const result = await dohQueryAsync({ url: this.dnsServer }, [{ type: 'A', name: hostname }])
       if (result.answers.length === 0) {
         // 说明没有获取到ip
-        log.info('该域名没有ip地址解析:', hostname)
+        log.info('该域名没有ip地址解析:', hostname, ', cost:', (new Date() - start), 'ms')
         return []
       }
       const ret = result.answers.filter(item => item.type === 'A').map(item => item.data)
       if (ret.length === 0) {
-        log.info('该域名没有IPv4地址解析:', hostname)
+        log.info('该域名没有IPv4地址解析:', hostname, ', cost:', (new Date() - start), 'ms')
       } else {
-        log.info('获取到域名地址：', hostname, JSON.stringify(ret))
+        log.info('获取到域名地址：', hostname, JSON.stringify(ret), ', cost:', (new Date() - start), 'ms')
       }
       return ret
     } catch (e) {
-      log.warn('DNS query error:', hostname, ', dns:', this.dnsServer, ', error:', e)
+      log.warn('DNS query error:', hostname, ', dns:', this.dnsServer, ', cost:', (new Date() - start), 'ms, error:', e)
       return []
     }
   }