docs(phase-03): complete phase execution
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@@ -4,7 +4,7 @@ milestone: v1.0
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milestone_name: milestone
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status: Ready to plan
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stopped_at: "Completed 03-pipeline-integration-and-mvp 03-02-PLAN.md (checkpoint: Task 2 awaiting human-verify)"
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last_updated: "2026-03-26T12:16:38.625Z"
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last_updated: "2026-03-26T12:47:14.960Z"
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progress:
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total_phases: 4
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completed_phases: 3
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@@ -23,7 +23,7 @@ See: .planning/PROJECT.md (updated 2026-03-24)
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## Current Position
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Phase: 3
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Phase: 4
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Plan: Not started
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## Performance Metrics
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---
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phase: 03-pipeline-integration-and-mvp
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verified: 2026-03-26T00:00:00Z
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status: human_needed
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score: 9/9 must-haves verified
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re_verification: false
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human_verification:
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- test: "Run netsynth on loopback, generate traffic, press Ctrl+C, inspect MP3"
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expected: "Valid non-zero MP3 at specified path; stderr shows protocol summary, then 'Encoding N windows to <path>...', then 'Saved <path> (Xs, N KB, encoded in Xs)'"
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why_human: "Live capture requires CAP_NET_RAW privileges and real packet traffic; ffprobe validation of produced MP3 cannot be done without running the binary against a live interface"
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- test: "Run netsynth on loopback and immediately press Ctrl+C before any traffic"
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expected: "Error message like 'synthesis failed: no packets captured...'; no output file created at specified path"
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why_human: "Zero-packet path requires confirming no file is left on disk, which requires executing the binary"
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---
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# Phase 03: Pipeline Integration and MVP Verification Report
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**Phase Goal:** Wire capture into synthesis, Ctrl+C with valid MP3 output, auto-clustering of unknown traffic
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**Verified:** 2026-03-26
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**Status:** human_needed — all automated checks pass; live end-to-end MP3 production needs human testing
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**Re-verification:** No — initial verification
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---
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## Goal Achievement
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### Observable Truths (Plan 03-01: CLAS-02)
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| # | Truth | Status | Evidence |
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|----|-----------------------------------------------------------------------------------------------|------------|---------------------------------------------------------------------------------------------|
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| 1 | AllClasses() returns exactly 14 classes with no ClassUnknown | VERIFIED | `classify/types.go` lines 18-29: 14 constants, no bare "unknown" constant; `TestAllClassesCount` asserts exactly 14 |
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| 2 | Unrecognized TCP/UDP packets are deterministically assigned to ClassUnknown1-4 via hash-bucketing | VERIFIED | `classify/classifier.go` lines 80-101: `hashBucket()` with formula `(dstPort*31 + protoNum*7) % 4`; `TestHashBucketDistribution` passes |
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| 3 | Packets with no transport layer (ARP etc.) are assigned to an unknown bucket, not silently dropped | VERIFIED | `classifier.go` line 73: `result.Class = hashBucket(result.DstPort, result.Protocol)` on the no-transport-layer path; `TestClassifyUnknown` (ARP packet) passes |
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| 4 | Each unknown bucket has a distinct tone in the 850-1100 Hz dissonant range | VERIFIED | `synth/config.go` lines 43-46: ClassUnknown1=862 Hz, ClassUnknown2=920 Hz, ClassUnknown3=981 Hz, ClassUnknown4=1047 Hz; `TestFrequenciesInRange` and `TestFrequenciesUnique` pass |
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| 5 | GainPerLayer is 1/14 so 14 layers mix without clipping | VERIFIED | `synth/config.go` line 10: `GainPerLayer = 1.0 / float64(NumLayers)` where `NumLayers = 14`; `TestMixerNoClip` passes with all 14 classes at count=1000 |
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### Observable Truths (Plan 03-02: CAPT-03)
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| # | Truth | Status | Evidence |
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|----|-----------------------------------------------------------------------------------------------|--------------|----------------------------------------------------------------------------------------------|
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| 6 | User runs `netsynth -i <iface> -o out.mp3`, generates traffic, presses Ctrl+C, receives a valid playable MP3 | HUMAN_NEEDED | `encode.RunSynthesis` is wired in `main.go` line 110 and build succeeds; live MP3 playability needs human test |
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| 7 | Protocol summary prints to stderr BEFORE encoding begins | VERIFIED | `main.go` line 105: `aggregate.PrintSummary` at line 105 before `encode.RunSynthesis` at line 110 |
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| 8 | User sees "Encoding N windows to <path>..." status message during encoding | VERIFIED | `main.go` line 108: `fmt.Fprintf(os.Stderr, "Encoding %d windows to %s...\n", ...)` |
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| 9 | User sees "Saved <path> (Xs, N KB, encoded in Xs)" confirmation after encoding | VERIFIED | `main.go` lines 121-122: `fmt.Fprintf(os.Stderr, "Saved %s (%.1fs, %d KB, encoded in %.1fs)\n", ...)` |
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| 10 | Zero-packet captures produce an error message, not a corrupt file | VERIFIED | `encode/mp3.go` lines 48-53: zero-packet guard runs before `os.Create`, returns error before any file is written |
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**Score:** 9/9 automated truths verified; 1 truth (live MP3 production) needs human confirmation
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---
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## Required Artifacts
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### Plan 03-01 Artifacts
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| Artifact | Expected | Status | Details |
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|-----------------------------|------------------------------------------------------|----------|----------------------------------------------------------------------------------|
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| `classify/types.go` | ClassUnknown1-4 constants, 14-element AllClasses() | VERIFIED | Lines 18-31: 4 constants plus AllClasses() returning 14-element slice |
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| `classify/classifier.go` | hashBucket() function routing unrecognized traffic | VERIFIED | Lines 80-101: `func hashBucket(dstPort uint16, protocol string) TrafficClass` |
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| `synth/config.go` | FreqConfig entries for all 14 classes, NumLayers=14 | VERIFIED | Line 9: `NumLayers = 14`; lines 31-46: 14 entries in ClassFreqConfigs |
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| `synth/config_test.go` | TestClassFreqConfigsComplete and TestNumLayersMatchesAllClasses | VERIFIED | Lines 53-65: both functions present and passing |
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### Plan 03-02 Artifacts
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| Artifact | Expected | Status | Details |
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|-----------------------------|------------------------------------------------------|----------|----------------------------------------------------------------------------------|
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| `cmd/netsynth/main.go` | End-to-end pipeline wiring with encode.RunSynthesis | VERIFIED | Lines 105-122: full pipeline sequence present; import `encode` at line 19 |
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---
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## Key Link Verification
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### Plan 03-01 Key Links
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| From | To | Via | Status | Details |
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|----------------------------|-----------------------|------------------------------------------|----------|-------------------------------------------------------------|
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| `classify/classifier.go` | `classify/types.go` | hashBucket returns ClassUnknown1-4 constants | WIRED | Lines 93-99: explicit `return ClassUnknown1/2/3/4` in switch cases |
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| `synth/config.go` | `classify/types.go` | ClassFreqConfigs map keys include all 14 classes | WIRED | Lines 43-46: `classify.ClassUnknown1` through `classify.ClassUnknown4` present as map keys |
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### Plan 03-02 Key Links
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| From | To | Via | Status | Details |
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|----------------------------|-----------------------|-------------------------------------------------------|----------|--------------------------------------------------------------|
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| `cmd/netsynth/main.go` | `encode/mp3.go` | `encode.RunSynthesis(collectedSnapshots, outputPath)` | WIRED | Line 110: `if err := encode.RunSynthesis(collectedSnapshots, outputPath)` |
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| `cmd/netsynth/main.go` | `aggregate/summary.go` | PrintSummary called before RunSynthesis (D-08) | WIRED | Line 105 (PrintSummary) precedes line 110 (RunSynthesis); verified by line numbers |
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---
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## Data-Flow Trace (Level 4)
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`cmd/netsynth/main.go` accumulates snapshots from the real packet capture pipeline (lines 94-98) and passes the populated slice to `encode.RunSynthesis`. `encode.RunSynthesis` counts total packets across snapshots before proceeding, ensuring zero-packet captures are rejected. The data path is: live interface -> `capture.StartCapture` -> `classify.Classify` -> `aggregate.Aggregate` -> `collectedSnapshots` -> `encode.RunSynthesis`. No static empty data is returned along the path.
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| Artifact | Data Variable | Source | Produces Real Data | Status |
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|-------------------------|-----------------------|-------------------------------------|--------------------|-----------|
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| `cmd/netsynth/main.go` | `collectedSnapshots` | `aggregate.Aggregate` over `snapshots` channel | Yes (from live capture) | FLOWING |
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| `encode/mp3.go` | `snapshots []classify.WindowSnapshot` | caller (`main.go`) | Yes — zero-packet guard verifies | FLOWING |
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---
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## Behavioral Spot-Checks
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| Behavior | Command | Result | Status |
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|---------------------------------------------|-------------------------------------------------------------------------|---------------------|----------|
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| Binary builds without errors | `go build -o /tmp/netsynth-verify ./cmd/netsynth` | exit 0, "BUILD OK" | PASS |
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| Full test suite passes | `go test ./... -count=1` | All 6 packages pass | PASS |
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| No bare ClassUnknown in production code | `grep -rn 'ClassUnknown[^1-4]' classify/ synth/ encode/ cmd/ aggregate/ \| grep -v test \| grep -v //` | No output | PASS |
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| No TODO(phase-3) stubs remaining | `grep -rn 'TODO(phase-3)\|_ = collectedSnapshots' cmd/` | No output | PASS |
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| Commits documented in summaries exist | `git log --oneline -5` | ff3ec7e and 0ab2c6e confirmed | PASS |
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---
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## Requirements Coverage
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| Requirement | Source Plan | Description | Status | Evidence |
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|-------------|-------------|--------------------------------------------------------------------------|-------------|---------------------------------------------------------------------------------|
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| CLAS-02 | 03-01 | Unrecognized traffic is auto-clustered and assigned unique tones automatically | SATISFIED | hashBucket routes to ClassUnknown1-4 (classifier.go:80-101); 4 distinct FreqConfigs in synth/config.go:43-46 |
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| CAPT-03 | 03-02 | Capture runs until user presses Ctrl+C, then gracefully flushes and saves MP3 | SATISFIED (automated) / HUMAN_NEEDED (live MP3) | signal.NotifyContext(main.go:63), RunSynthesis call(main.go:110), Saved message(main.go:121) — live MP3 playability requires human test |
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No orphaned requirements: REQUIREMENTS.md maps CLAS-02 and CAPT-03 exclusively to Phase 3 and both are covered by the phase plans.
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---
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## Anti-Patterns Found
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| File | Line | Pattern | Severity | Impact |
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|------|------|---------|----------|--------|
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| None | — | — | — | — |
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No TODOs, FIXMEs, placeholders, empty returns, or hardcoded empty data found in production files modified by this phase.
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---
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## Human Verification Required
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### 1. End-to-End Live Capture to MP3
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**Test:**
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1. Build: `go build -o ./netsynth ./cmd/netsynth`
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2. Run: `sudo ./netsynth -i lo -o /tmp/test-mvp.mp3`
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3. In another terminal: `ping -c 5 127.0.0.1`
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4. Press Ctrl+C
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**Expected:**
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- stderr shows: protocol summary (packet counts per class), then `Encoding N windows to /tmp/test-mvp.mp3...`, then `Saved /tmp/test-mvp.mp3 (Xs, N KB, encoded in Xs)`
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- `ls -la /tmp/test-mvp.mp3` shows a non-zero file
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- `ffprobe /tmp/test-mvp.mp3 2>&1 | head -20` reports a valid MP3 stream
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**Why human:** Live packet capture requires CAP_NET_RAW and a real network interface. Confirming the MP3 is playable (not corrupt, correct duration) requires execution in a privileged environment.
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### 2. Zero-Packet Error Handling
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**Test:**
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1. Run: `sudo ./netsynth -i lo -o /tmp/test-zero.mp3`
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2. Press Ctrl+C immediately (before any traffic)
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**Expected:**
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- stderr shows an error such as `synthesis failed: no packets captured: output MP3 not written (empty capture produces no audio)`
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- `ls /tmp/test-zero.mp3` shows the file does NOT exist
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**Why human:** Confirming no file is left on disk and the error message is clear requires executing the binary with real timing.
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---
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## Gaps Summary
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No automated gaps found. All 9 programmatically verifiable must-haves are confirmed. The single item requiring human verification (live MP3 production on a real interface) was anticipated in Plan 03-02 as a `checkpoint:human-verify` task and is expected pending human sign-off.
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---
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_Verified: 2026-03-26_
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_Verifier: Claude (gsd-verifier)_
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