optimize DNS client performance

[ii2day]

No description provided.

[codecov]

Codecov Report

Merging #357 (e8c354c) into main (0a82158) will increase coverage by 10.04%.
The diff coverage is 94.94%.

@@             Coverage Diff             @@
##             main     #357       +/-   ##
===========================================
+ Coverage   31.56%   41.61%   +10.04%     
===========================================
  Files           6        8        +2     
  Lines         453      495       +42     
===========================================
+ Hits          143      206       +63     
+ Misses        299      285       -14     
+ Partials       11        4        -7     

Flag	Coverage Δ
unittests	41.61% <94.94%> (+10.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/loadRequest/loadDns/dns_reporter.go	85.71% <85.71%> (ø)
pkg/loadRequest/loadDns/dns.go	91.89% <93.33%> (+13.57%)	⬆️
pkg/loadRequest/loadDns/dns_requester.go	97.50% <97.50%> (ø)

[ii2day]

"Detail": {
	"Detail": [
		{
			"FailureReason": "",
			"MeanDelay": 8.1,
			"Metrics": {
				"start": "2023-05-23T13:14:00.021766571Z",
				"end": "2023-05-23T13:14:10.040998222Z",
				"target_domain": "baidu.com.",
				"dns_server": "172.18.0.1:53",
				"Method": "udp",
				"duration": "10.019231651s",
				"requests": 100,
				"success": 100,
				"failed": 0,
				"TPS": 9.980805263647058,
				"latencies": {
					"Mean_inMs": 8.1,
					"P50_inMs": 7,
					"P90_inMs": 14,
					"P95_inMs": 14,
					"P99_inMs": 15,
					"Max_inMs": 15,
					"Min_inMs": 4
				},
				"errors": {},
				"reply_code": {
					"NOERROR": 100
				}
			},
			"Succeed": "true",
			"SucceedRate": "1",
			"TargetName": "typeA_172.18.0.1:53_baidu.com",
			"TargetProtocol": "udp",
			"TargetServer": "172.18.0.1:53"
		}
	],
	"FailureReason": "",
	"Succeed": "true",
	"TargetNumber": "1",
	"TargetType": "spiderdoctor agent"
}