feat: implement request tracer

[GregoryAlbouy]

Description

Implement and add profiling features to the request benchmarks.

Instead of measuring the total duration only, we now have access to a timestamp for each step of an http request.
This will allow for more insightful data for the user.

Example

• Local request (http)

  ./bin/benchttp -requests 1 -url "http://localhost:9999"
  

  Output

  [
    {
      "Cost": 0,
      "Code": 200,
      "Bytes": 0,
      "Error": null,
      "Profile": [
        {
          "Name": "GetConn",
          "Time": 70
        },
        {
          "Name": "DNSStart",
          "Time": 38155
        },
        {
          "Name": "DNSDone",
          "Time": 836820
        },
        {
          "Name": "ConnectStart",
          "Time": 866851
        },
        {
          "Name": "ConnectDone",
          "Time": 1072322
        },
        {
          "Name": "ConnectStart",
          "Time": 1125989
        },
        {
          "Name": "ConnectDone",
          "Time": 1257758
        },
        {
          "Name": "GotConn",
          "Time": 1290506
        },
        {
          "Name": "WroteHeaders",
          "Time": 1358900
        },
        {
          "Name": "WroteRequest",
          "Time": 1361062
        },
        {
          "Name": "GotFirstResponseByte",
          "Time": 1473155
        },
        {
          "Name": "PutIdleConn",
          "Time": 1528966
        }
      ]
    }
  ]
  

• Remote request (https)

  ./bin/benchttp -requests 1 -url "https://example.com"
  

  Output

  [
    {
      "Cost": 0,
      "Code": 200,
      "Bytes": 1256,
      "Error": null,
      "Profile": [
        {
          "Name": "GetConn",
          "Time": 74
        },
        {
          "Name": "DNSStart",
          "Time": 42508
        },
        {
          "Name": "DNSDone",
          "Time": 10587412
        },
        {
          "Name": "ConnectStart",
          "Time": 10655260
        },
        {
          "Name": "ConnectDone",
          "Time": 89404642
        },
        {
          "Name": "TLSHandshakeStart",
          "Time": 89554213
        },
        {
          "Name": "TLSHandshakeDone",
          "Time": 414801212
        },
        {
          "Name": "GotConn",
          "Time": 415041317
        },
        {
          "Name": "WroteHeaders",
          "Time": 415092642
        },
        {
          "Name": "WroteRequest",
          "Time": 415092837
        },
        {
          "Name": "GotFirstResponseByte",
          "Time": 497572965
        }
      ]
    }
  ]
  

Changes

Notes

[codecov-commenter]

Codecov Report

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[c1-ra]

Nice 👍

[moreirathomas]

Small misc nitpicks.
Otherwise good !

[c1-ra]

👍