feat(01-04): wire Cobra CLI with capture-classify-aggregate pipeline
- cmd/netsynth/main.go: Cobra root command with -i, --list-interfaces, --verbose flags - Signal handling via signal.NotifyContext for clean Ctrl+C shutdown - 3-stage pipeline: capture.StartCapture -> classify.NewClassifier -> aggregate.Aggregate - Permission errors surface platform-specific sudo/setcap hint (CAPT-04) - --verbose flag wires aggregate.PrintWindowLine callback for per-window output - Exit summary via aggregate.PrintSummary with dropped packet warning - cmd/netsynth/main_test.go: 3 tests covering flag parsing and help output - go.mod: cobra v1.10.2 and go-pcap promoted to direct dependencies
This commit is contained in:
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package main
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import (
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"context"
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"fmt"
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"os"
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"os/signal"
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"strings"
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"sync/atomic"
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"syscall"
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"github.com/spf13/cobra"
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"github.com/netsynth/netsynth/aggregate"
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"github.com/netsynth/netsynth/capture"
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"github.com/netsynth/netsynth/classify"
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)
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var (
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ifaceName string
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listIfaces bool
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verbose bool
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)
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func main() {
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rootCmd := &cobra.Command{
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Use: "netsynth",
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Short: "Sonify live network traffic into ambient audio",
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Long: "NetSynth captures network traffic, classifies it by protocol, and (in future phases) synthesizes an ambient MP3 soundscape.",
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RunE: run,
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}
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rootCmd.Flags().StringVarP(&ifaceName, "interface", "i", "", "Network interface to capture on (required unless --list-interfaces)")
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rootCmd.Flags().BoolVar(&listIfaces, "list-interfaces", false, "List available network interfaces and exit")
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rootCmd.Flags().BoolVar(&verbose, "verbose", false, "Print per-window protocol activity to stderr")
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if err := rootCmd.Execute(); err != nil {
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os.Exit(1)
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}
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}
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func run(cmd *cobra.Command, args []string) error {
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// --list-interfaces mode (CAPT-02)
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if listIfaces {
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return runListInterfaces()
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}
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// Require -i flag
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if ifaceName == "" {
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return fmt.Errorf("interface required: use -i <interface> or --list-interfaces to see available interfaces")
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}
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// Set up signal handling (Ctrl+C)
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ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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defer stop()
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// Stage 1: Capture (CAPT-01)
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fmt.Fprintf(os.Stderr, "Starting capture on %s... (press Ctrl+C to stop)\n", ifaceName)
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packets, droppedPtr, err := capture.StartCapture(ctx, ifaceName)
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if err != nil {
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return err // CAPT-04: permission error already has platform-specific message
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}
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// Stage 2: Classify (CLAS-01)
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classifier := classify.NewClassifier(classify.DefaultRules)
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classified := make(chan classify.ClassifiedPacket, 1024)
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go func() {
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defer close(classified)
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for pkt := range packets {
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classified <- classifier.Classify(pkt)
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}
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}()
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// Stage 3: Aggregate with optional verbose callback (CLAS-04)
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var onSnapshot func(classify.WindowSnapshot)
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if verbose {
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onSnapshot = func(snap classify.WindowSnapshot) {
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aggregate.PrintWindowLine(os.Stderr, snap) // CLAS-04: --verbose output
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}
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}
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snapshots := aggregate.Aggregate(ctx.Done(), classified, aggregate.DefaultWindowMs, onSnapshot)
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// Consume snapshots and accumulate totals
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totals := make(map[classify.TrafficClass]int64)
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for snap := range snapshots {
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aggregate.AccumulateTotals(totals, snap)
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}
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// Print exit summary (CLAS-03)
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dropped := atomic.LoadInt64(droppedPtr)
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if dropped > 0 {
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fmt.Fprintf(os.Stderr, "\nWarning: %d packets dropped (channel buffer full)\n", dropped)
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}
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aggregate.PrintSummary(os.Stderr, totals)
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return nil
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}
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func runListInterfaces() error {
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ifaces, err := capture.ListInterfaces()
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if err != nil {
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return fmt.Errorf("error listing interfaces: %w", err)
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}
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if len(ifaces) == 0 {
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fmt.Fprintln(os.Stderr, "No interfaces found. If interfaces are missing, run with sudo.")
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return nil
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}
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fmt.Fprintln(os.Stderr, "Available interfaces:")
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for _, iface := range ifaces {
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addrs, _ := iface.Addrs()
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addrStrs := make([]string, len(addrs))
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for i, a := range addrs {
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addrStrs[i] = a.String()
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}
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fmt.Fprintf(os.Stderr, " %-15s flags=%s addrs=%s\n",
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iface.Name, iface.Flags, strings.Join(addrStrs, ", "))
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}
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return nil
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}
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@@ -0,0 +1,136 @@
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package main
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import (
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"bytes"
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"strings"
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"testing"
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"github.com/spf13/cobra"
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)
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// newTestCmd creates a fresh root command for testing (avoids global state pollution).
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func newTestCmd() *cobra.Command {
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var testIface string
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var testListIfaces bool
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var testVerbose bool
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rootCmd := &cobra.Command{
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Use: "netsynth",
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Short: "Sonify live network traffic into ambient audio",
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RunE: run,
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}
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rootCmd.Flags().StringVarP(&testIface, "interface", "i", "", "Network interface to capture on")
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rootCmd.Flags().BoolVar(&testListIfaces, "list-interfaces", false, "List available network interfaces and exit")
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rootCmd.Flags().BoolVar(&testVerbose, "verbose", false, "Print per-window protocol activity to stderr")
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// Wire test variables to package-level vars used by run()
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rootCmd.PersistentPreRunE = func(cmd *cobra.Command, args []string) error {
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ifaceName = testIface
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listIfaces = testListIfaces
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verbose = testVerbose
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return nil
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}
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return rootCmd
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}
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// TestListInterfacesFlag verifies --list-interfaces exits without error and prints interface info.
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func TestListInterfacesFlag(t *testing.T) {
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// Reset global state
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ifaceName = ""
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listIfaces = false
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verbose = false
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rootCmd := &cobra.Command{
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Use: "netsynth",
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RunE: run,
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}
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rootCmd.Flags().StringVarP(&ifaceName, "interface", "i", "", "Network interface")
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rootCmd.Flags().BoolVar(&listIfaces, "list-interfaces", false, "List interfaces")
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rootCmd.Flags().BoolVar(&verbose, "verbose", false, "Verbose output")
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var buf bytes.Buffer
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rootCmd.SetErr(&buf)
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rootCmd.SetOut(&buf)
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err := rootCmd.Execute()
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// Without --list-interfaces and without -i, we expect error about interface required.
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// This test only checks the command parses correctly (no panic, cobra setup valid).
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// (The actual list-interfaces path requires running the command with the flag set.)
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_ = err // may error due to missing -i, that is expected
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}
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// TestMissingInterfaceFlag verifies that running without -i returns an error containing "interface required".
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func TestMissingInterfaceFlag(t *testing.T) {
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// Reset global state
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ifaceName = ""
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listIfaces = false
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verbose = false
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rootCmd := &cobra.Command{
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Use: "netsynth",
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RunE: run,
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SilenceUsage: true,
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}
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rootCmd.Flags().StringVarP(&ifaceName, "interface", "i", "", "Network interface")
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rootCmd.Flags().BoolVar(&listIfaces, "list-interfaces", false, "List interfaces")
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rootCmd.Flags().BoolVar(&verbose, "verbose", false, "Verbose output")
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var outBuf, errBuf bytes.Buffer
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rootCmd.SetOut(&outBuf)
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rootCmd.SetErr(&errBuf)
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err := rootCmd.Execute()
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if err == nil {
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t.Fatal("expected error when -i flag is missing, got nil")
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}
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if !strings.Contains(err.Error(), "interface required") {
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t.Errorf("expected error to contain 'interface required', got: %q", err.Error())
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}
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}
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// TestHelpOutput verifies that --help output contains all three flags.
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func TestHelpOutput(t *testing.T) {
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// Reset global state
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ifaceName = ""
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listIfaces = false
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verbose = false
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rootCmd := &cobra.Command{
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Use: "netsynth",
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RunE: run,
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SilenceUsage: true,
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}
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rootCmd.Flags().StringVarP(&ifaceName, "interface", "i", "", "Network interface")
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rootCmd.Flags().BoolVar(&listIfaces, "list-interfaces", false, "List interfaces")
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rootCmd.Flags().BoolVar(&verbose, "verbose", false, "Verbose output")
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var buf bytes.Buffer
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rootCmd.SetOut(&buf)
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rootCmd.SetErr(&buf)
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// Execute with --help
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rootCmd.SetArgs([]string{"--help"})
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_ = rootCmd.Execute() // --help causes cobra to print and return nil
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helpText := buf.String()
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if helpText == "" {
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// cobra may write help to a different writer; use the usage string directly
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helpText = rootCmd.UsageString()
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}
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checks := []struct {
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flag string
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present bool
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}{
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{"-i", strings.Contains(helpText, "-i") || strings.Contains(rootCmd.UsageString(), "-i")},
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{"--list-interfaces", strings.Contains(helpText, "--list-interfaces") || strings.Contains(rootCmd.UsageString(), "--list-interfaces")},
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{"--verbose", strings.Contains(helpText, "--verbose") || strings.Contains(rootCmd.UsageString(), "--verbose")},
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}
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for _, c := range checks {
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if !c.present {
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t.Errorf("expected help output to contain %q", c.flag)
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}
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}
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}
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