refactor: reorganize code structure and improve request handling

[kazeburo]

PR Type

Enhancement, Tests

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Description

• Adopt flagrun command execution framework.

• Extract HTTP request handling into request.go.

• Add client-wide timeout and statistical calculations.

• Add comprehensive request and metrics tests.

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Diagram Walkthrough

flowchart LR
  Opt["CLI options"] 
  Flagrun["flagrun command runner"]
  Client["Configured HTTP client"]
  Request["Request timing helper"]
  Metrics["RTT metrics output"]
  Opt -- "runs through" --> Flagrun
  Opt -- "creates" --> Client
  Client -- "executes" --> Request
  Request -- "produces timings for" --> Metrics

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File Walkthrough

	Relevant files
Enhancement	main.go Refactor command execution and RTT metric collection          main.go Replace manual CLI parsing with flagrun. Convert options into the exported Opt command type. Build configured HTTP clients with whole-request timeouts. Calculate RTT metrics through stats and write to a supplied writer. +59/-93  request.go Extract and harden HTTP request timing                                      request.go Extract request creation into an Opt method. Move first-byte response timing into doRequest. Safely drain and close response bodies. Handle EOF reads using errors.Is. +32/-0
Tests	main_test.go Add comprehensive HTTP statistics command tests                    main_test.go Add end-to-end tests for metric collection scenarios. Cover invalid URLs, failures, redirects, intervals, and keepalive settings. Validate output format and calculated statistics. Add getStats benchmark coverage. +303/-0  request_test.go Test HTTP request creation and timing                                        request_test.go Test request creation for valid and invalid URLs. Cover response statuses, client errors, timeouts, and body handling. Verify large responses and trailing-slash requests. Add a request timing benchmark. +150/-0  testutil_test.go Add reusable HTTP metrics test utilities                                  testutil_test.go Add reusable HTTP server and client test helpers. Provide metric parsing and assertion utilities. Support both tests and benchmarks through testingT. +105/-0
Dependencies	go.mod Add command statistics and test dependencies                          go.mod Add flagrun for command parsing and execution. Add stats for RTT aggregate calculations. Add testify and its indirect test dependencies. Update indirect golang.org/x/sys dependency. +13/-2

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PR Reviewer Guide 🔍

(Review updated until commit af66d2c)

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⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ No major issues detected

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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Persistent review updated to latest commit af66d2c

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