Alamofire4.x开源代码分析(四)Timeline和cURL Command Output

Timeline(时间统计)

Timeline是Alamofire提供的贯穿整个request生命周期的时间统计方案,可以通过response.timeline来访问.

1Alamofire.request("https://httpbin.org/get").responseJSON { response in
2    print(response.timeline)
3}

如下打印

1Timeline: 
2    { 
3    "Latency": 1.474 secs, //请求到服务器响应
4    "Request Duration": 1.478 secs,//请求开始到完成
5    "Serialization Duration": 0.013 secs,//序列化时间
6    "Total Duration": 1.491 secs //总时间
7      }

URL Session Task Metrics

在iOS10中,苹果提供了URLSessionTaskMetrics的API,和timeline非常相似,它支持更多的统计数据,并支持任何类型的响应.

1Alamofire.request("https://httpbin.org/get").responseJSON { response in
2    //版本限定
3    if #available(iOS 10.0, *) {
4        print(response.metrics)
5    }
6}
7
8
9Request) <NSURLRequest: 0x60000001f9a0> { URL: https://httpbin.org/get }
10(Response) <NSHTTPURLResponse: 0x600000223f60> { URL: https://httpbin.org/get } { status code: 200, headers {
11    "Access-Control-Allow-Credentials" = true;
12    "Access-Control-Allow-Origin" = "*";
13    Connection = "keep-alive";
14    "Content-Length" = 375;
15    "Content-Type" = "application/json";
16    Date = "Tue, 04 Jul 2017 00:43:51 GMT";
17    Server = "meinheld/0.6.1";
18    Via = "1.1 vegur";
19    "X-Powered-By" = Flask;
20    "X-Processed-Time" = "0.00100803375244";
21} }
22(Fetch Start) 2017-07-04 00:43:54 +0000
23(Domain Lookup Start) 2017-07-04 00:43:54 +0000
24(Domain Lookup End) 2017-07-04 00:43:54 +0000
25(Connect Start) 2017-07-04 00:43:54 +0000
26(Secure Connection Start) 2017-07-04 00:43:55 +0000
27(Secure Connection End) 2017-07-04 00:43:55 +0000
28(Connect End) 2017-07-04 00:43:55 +0000
29(Request Start) 2017-07-04 00:43:55 +0000
30(Request End) 2017-07-04 00:43:55 +0000
31(Response Start) 2017-07-04 00:43:55 +0000
32(Response End) 2017-07-04 00:43:55 +0000
33(Protocol Name) http/1.1
34(Proxy Connection) NO
35(Reused Connection) NO
36(Fetch Type) Network Load

cURL Command Output(输出请求url)

开发过程中我们都有自己拼接参数到url的经历,幸运的是Alamofire实现调试过程中直接输出请求url和参数,方便了我们在xcode以外做接口调试,比如浏览器,postman等工具.

1let request = Alamofire.request("https://httpbin.org/get", parameters: ["foo": "bar"])
2debugPrint(request)

输出

1$ curl -i \
2    -H "User-Agent: Alamofire/4.0.0" \
3    -H "Accept-Encoding: gzip;q=1.0, compress;q=0.5" \
4    -H "Accept-Language: en;q=1.0,fr;q=0.9,de;q=0.8,zh-Hans;q=0.7,zh-Hant;q=0.6,ja;q=0.5" \
5    "https://httpbin.org/get?foo=bar"