docs: update README for new cli handling options

.envrc

@@ -0,0 +1 @@
+use flake

.github/workflows/go.yml

@@ -15,10 +15,10 @@ jobs:
     - name: "Set up Go"
       uses: actions/setup-go@v4
       with:
-        go-version: '1.22'
+        go-version: '1.24'
 
     - name: "Build"
       run: go build -v ./.
 
     - name: "Test"
-      run: go test -v ./.
+      run: go test -v ./...

.gitignore

@@ -1,22 +1,9 @@
-# If you prefer the allow list template instead of the deny list, see community template:
-# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
-#
-# Binaries for programs and plugins
-*.exe
-*.exe~
-*.dll
-*.so
-*.dylib
+# Built binary
+/tct
 
 # Test binary, built with `go test -c`
 *.test
 
-# Output of the go coverage tool, specifically when used with LiteIDE
-*.out
-
-# Dependency directories (remove the comment below to include it)
-# vendor/
-
-# Go workspace file
-go.work
-go.work.sum
+# Nix
+/.direnv/
+/result*

README.md

@@ -1,8 +1,8 @@
 # tct
 
-**tct** (**t**cp **c**onnection **t**imer) is a quick and minimal program (< 70
-LoC!) that helps determine the "optimal" number of parallel TCP requests for
-your network connection.
+**t**cp **c**onnection **t**imer (tct) is a miniscule utility to help determinee
+the "optimal" number of parallel TCP requests for your network connection, for a
+given target.
 
 It performs a series of tests (following your desired configuration) by
 incrementally increasing the number of parallel requests and measuring the time
@@ -11,6 +11,48 @@ taken for each test.
 The optimal number is identified as the point where adding more parallel
 requests does not significantly reduce the overall time taken.
 
+## Usage
+
+```bash
+Usage:
+  tct [flags]
+
+Flags:
+  -d, --delay duration   Delay between requests
+  -h, --help             help for tct
+  -m, --max int          Maximum number of parallel requests (default 100)
+  -u, --url string       URL to fetch (default "http://example.com")
+  -v, --version          version for tct
+```
+
+For example:
+
+```bash
+tct --max 200 --delay 100ms --url "http://yourtargeturl.com"
+```
+
+Replace `"http://yourtargeturl.com"` with the actual URL you wish to test
+against. You can also omit the URL and use an IP address instead. For example,
+`8.8.8.8` for Google or `1.1.1.1` for Cloudflare. You may notice differences
+between target URLs as a result of different distances to different hosts, or
+different network setups.
+
+The `--max` parameter specifies the maximum number of parallel requests to test,
+and `--delay` sets the interval between each request.
+
+> [!TIP]
+> You are strongly advised to use the delay option. I have observed high latency
+> while running with the default 0 second delay, which is likely some form of
+> throttling by the host. If you test against an URL that you _know_ does not
+> throttle connections, then you may consider omitting `-delay`.
+
+### Flags
+
+- `--url`: The URL to fetch.
+- `--max`: Maximum number of parallel requests to test. Default is `100`
+- `--delay`: Delay between requests. Can be specified as a duration (e.g.,
+  `500ms`). Default is `0` (i.e. no delay)
+
 ## Motivation
 
 The [Nix Package Manager](https://github.com/NixOS/nix) has an option called
@@ -25,37 +67,6 @@ set `http-connections` in.
 Do keep in mind that this is not 100% accurate. There are many factors that may
 affect the results of network related tests.
 
-## Usage
-
-```bash
-tct -url="http://yourtargeturl.com" -max=200 -delay=500ms
-```
-
-Replace `"http://yourtargeturl.com"` with the actual URL you wish to test
-against. You can also omit the URL and use an IP address instead, for example,
-`8.8.8.8` for Google or `1.1.1.1` for Cloudflare. You may notice differences
-between target URLs.
-
-The `-max` parameter specifies the maximum number of parallel requests to test,
-and `-delay` sets the interval between each request.
-
-<!-- deno-fmt-ignore-start -->
-
-> [!NOTE]
-> You are strongly advised to use the delay option. I have observed high
-> latency while running with the default 0 second delay, which is likely some
-> form of throttling by the host. If you test against an URL that you _know_
-> does not throttle connections, then you may consider omitting `-delay`.
-
-<!-- deno-fmt-ignore-end -->
-
-## Flags
-
-- `-url`: The URL to fetch.
-- `-max`: Maximum number of parallel requests to test. Default is `100`
-- `-delay`: Delay between requests. Can be specified as a duration (e.g.,
-  `500ms`). Default is `0` (i.e. no delay)
-
 ## Notes
 
 - Remember to adjust the `-max` and `-delay` parameters based on your network
@@ -63,7 +74,7 @@ and `-delay` sets the interval between each request.
   any assumptions, but the default values will not be suitable for all testing
   conditions.
 - tct will try to always exit gracefully when you, e.g., kill the program with
-  <kbd>ctrl+c</kbd>.
+  <kbd>Ctrl+C</kbd>.
 
 ## Contributing
 

cmd/root.go

@@ -0,0 +1,91 @@
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"os/signal"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/spf13/cobra"
+	"notashelf.dev/tct/internal/tct"
+)
+
+var (
+	url         string
+	maxRequests int
+	delay       time.Duration
+	Version     string // will be set by main package
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "tct",
+	Short: "TCP Connection Timer - find optimal parallel request count",
+	Long:  `A tool to measure and find the optimal number of parallel TCP requests for a given URL.`,
+	Run:   run,
+}
+
+func Execute() {
+	if Version != "" {
+		rootCmd.Version = Version
+	}
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	rootCmd.Flags().StringVarP(&url, "url", "u", "http://example.com", "URL to fetch")
+	rootCmd.Flags().IntVarP(&maxRequests, "max", "m", 100, "Maximum number of parallel requests")
+	rootCmd.Flags().DurationVarP(&delay, "delay", "d", 0, "Delay between requests")
+}
+
+func run(cmd *cobra.Command, args []string) {
+	client := tct.NewClient()
+
+	// Context that listens for the interrupt signal
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	optimal := 0
+	minTime := time.Duration(0)
+
+	for i := 1; i <= maxRequests; i++ {
+		// Check for cancellation before starting the loop
+		if ctx.Err() != nil {
+			break
+		}
+
+		start := time.Now()
+		wg := &sync.WaitGroup{}
+		wg.Add(i)
+
+		for range i {
+			go func() {
+				defer wg.Done()
+				select {
+				case <-ctx.Done():
+					fmt.Println("Operation cancelled.")
+					return
+				default:
+					time.Sleep(delay)
+					client.MakeRequest(url)
+				}
+			}()
+		}
+
+		wg.Wait()
+		duration := time.Since(start)
+		fmt.Printf("Parallel Requests: %d, Time Taken: %s\n", i, duration)
+
+		if minTime == 0 || duration < minTime {
+			minTime = duration
+			optimal = i
+		}
+	}
+
+	fmt.Printf("\nOptimal Number of Parallel TCP Requests: %d\n", optimal)
+}

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1750134718,
+        "narHash": "sha256-v263g4GbxXv87hMXMCpjkIxd/viIF7p3JpJrwgKdNiI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9e83b64f727c88a7711a2c463a7b16eedb69a84c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,25 @@
+{
+  description = "Fast and minimal parallel TCP connection testing utility ";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
+
+  outputs = {
+    self,
+    nixpkgs,
+    ...
+  }: let
+    systems = ["x86_64-linux" "aarch64-linux"];
+    forEachSystem = nixpkgs.lib.genAttrs systems;
+
+    pkgsForEach = nixpkgs.legacyPackages;
+  in {
+    packages = forEachSystem (system: {
+      default = pkgsForEach.${system}.callPackage ./nix/package.nix {};
+    });
+
+    devShells = forEachSystem (system: {
+      default = pkgsForEach.${system}.callPackage ./nix/shell.nix {};
+    });
+
+    hydraJobs = self.packages;
+  };
+}

go.mod

@@ -1,12 +1,10 @@
 module notashelf.dev/tct
 
-go 1.22.2
+go 1.24.3
 
-require github.com/stretchr/testify v1.9.0
+require github.com/spf13/cobra v1.9.1
 
 require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/stretchr/objx v0.5.2 // indirect
-	gopkg.in/yaml.v3 v3.0.1 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.6 // indirect
 )

go.sum

@@ -1,12 +1,10 @@
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.5.2 h1:xuMeJ0Sdp5ZMRXx/aWO6RZxdr3beISkG5/G/aIRr3pY=
-github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
-github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.9.1 h1:CXSaggrXdbHK9CF+8ywj8Amf7PBRmPCOJugH954Nnlo=
+github.com/spf13/cobra v1.9.1/go.mod h1:nDyEzZ8ogv936Cinf6g1RU9MRY64Ir93oCnqb9wxYW0=
+github.com/spf13/pflag v1.0.6 h1:jFzHGLGAlb3ruxLB8MhbI6A8+AQX/2eW4qeyNZXNp2o=
+github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/tct/client.go

@@ -0,0 +1,32 @@
+package tct
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+type HttpClient interface {
+	Get(url string) (*http.Response, error)
+}
+
+type Client struct {
+	httpClient HttpClient
+}
+
+func NewClient() *Client {
+	return &Client{
+		httpClient: &http.Client{},
+	}
+}
+
+func (c *Client) MakeRequest(url string) {
+	resp, err := c.httpClient.Get(url)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	defer resp.Body.Close()
+	body, _ := io.ReadAll(resp.Body)
+	_ = body
+}

internal/tct/client_test.go

@@ -0,0 +1,46 @@
+package tct
+
+import (
+	"net/http"
+	"testing"
+)
+
+type MockHttpClient struct {
+	GetFunc func(url string) (*http.Response, error)
+}
+
+func (m *MockHttpClient) Get(url string) (*http.Response, error) {
+	return m.GetFunc(url)
+}
+
+func TestClientMakeRequest(t *testing.T) {
+	tests := []struct {
+		name string
+		url  string
+	}{
+		{
+			name: "valid URL",
+			url:  "http://example.com",
+		},
+		{
+			name: "another valid URL",
+			url:  "https://google.com",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			mockClient := &MockHttpClient{
+				GetFunc: func(url string) (*http.Response, error) {
+					return &http.Response{
+						StatusCode: 200,
+						Body:       http.NoBody,
+					}, nil
+				},
+			}
+
+			client := &Client{httpClient: mockClient}
+			client.MakeRequest(tt.url)
+		})
+	}
+}

main.go

@@ -1,79 +1,10 @@
 package main
 
-import (
-	"context"
-	"flag"
-	"fmt"
-	"io"
-	"net/http"
-	"os"
-	"os/signal"
-	"sync"
-	"syscall"
-	"time"
-)
+import "notashelf.dev/tct/cmd"
 
-type HttpClient interface {
-	Get(url string) (*http.Response, error)
-}
-
-var httpClient HttpClient = &http.Client{}
+var version = "dev" // will be set by build process
 
 func main() {
-	urlPtr := flag.String("url", "http://example.com", "URL to fetch")
-	maxRequestsPtr := flag.Int("max", 100, "Maximum number of parallel requests")
-	delayPtr := flag.Duration("delay", 0, "Delay between requests")
-
-	flag.Parse()
-	url := *urlPtr
-	maxRequests := *maxRequestsPtr
-	delay := *delayPtr
-
-	// context that listens for the interrupt signal.
-	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer stop()
-
-	optimal := 0
-	minTime := time.Duration(0)
-	for i := 1; i <= maxRequests; i++ {
-		// check for cancellation before starting the loop
-		if ctx.Err() != nil {
-			break
-		}
-		start := time.Now()
-		wg := &sync.WaitGroup{}
-		wg.Add(i)
-		for j := 0; j < i; j++ {
-			go func() {
-				defer wg.Done()
-				select {
-				case <-ctx.Done():
-					fmt.Println("Operation cancelled.")
-					return
-				default:
-					time.Sleep(delay)
-					makeRequest(httpClient, url)
-				}
-			}()
-		}
-		wg.Wait()
-		duration := time.Since(start)
-		fmt.Printf("Parallel Requests: %d, Time Taken: %s\n", i, duration)
-		if minTime == 0 || duration < minTime {
-			minTime = duration
-			optimal = i
-		}
-	}
-	fmt.Printf("\nOptimal Number of Parallel TCP Requests: %d\n", optimal)
-}
-
-func makeRequest(client HttpClient, url string) {
-	resp, err := client.Get(url)
-	if err != nil {
-		fmt.Println(err)
-		return
-	}
-	defer resp.Body.Close()
-	body, _ := io.ReadAll(resp.Body)
-	_ = body
+	cmd.Version = version
+	cmd.Execute()
 }

main_test.go

@@ -1,62 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"errors"
-	"io"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/stretchr/testify/mock"
-)
-
-type MockHttpClient struct {
-	mock.Mock
-}
-
-func (m *MockHttpClient) Get(url string) (*http.Response, error) {
-	args := m.Called(url)
-	return args.Get(0).(*http.Response), args.Error(1)
-}
-
-func TestMakeRequest(t *testing.T) {
-	tests := []struct {
-		name          string
-		statusCode    int
-		responseBody  string
-		expectedError error
-	}{
-		{
-			name:         "Successful request",
-			statusCode:   http.StatusOK,
-			responseBody: "OK",
-		},
-		{
-			name:          "Failed request",
-			statusCode:    http.StatusInternalServerError,
-			responseBody:  "",
-			expectedError: errors.New("request failed"),
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			mockClient := new(MockHttpClient)
-			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-				w.WriteHeader(tt.statusCode)
-				w.Write([]byte(tt.responseBody))
-			}))
-			defer server.Close()
-
-			mockClient.On("Get", server.URL).Return(&http.Response{
-				StatusCode: tt.statusCode,
-				Body:       io.NopCloser(bytes.NewBufferString(tt.responseBody)),
-			}, tt.expectedError)
-
-			makeRequest(mockClient, server.URL)
-
-			mockClient.AssertExpectations(t)
-		})
-	}
-}

nix/package.nix

@@ -0,0 +1,28 @@
+{
+  lib,
+  buildGoModule,
+}: let
+  fs = lib.fileset;
+  s = ../.;
+in
+  buildGoModule (finalAttrs: {
+    pname = "tct";
+    version = "0.1.0";
+
+    src = fs.toSource {
+      root = s;
+      fileset = fs.unions [
+        (fs.fileFilter (file: builtins.any file.hasExt ["go"]) s)
+        ../go.mod
+        ../go.sum
+      ];
+    };
+
+    vendorHash = "sha256-m5mBubfbXXqXKsygF5j7cHEY+bXhAMcXUts5KBKoLzM=";
+
+    ldflags = [
+      "-s"
+      "-w"
+      "-X main.version=${finalAttrs.version}"
+    ];
+  })

nix/shell.nix

@@ -0,0 +1,14 @@
+{
+  mkShell,
+  go,
+  gopls,
+  delve,
+}:
+mkShell {
+  name = "go";
+  packages = [
+    delve
+    go
+    gopls
+  ];
+}