49 lines
2.0 KiB
Markdown
49 lines
2.0 KiB
Markdown
 
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# Retrospective
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## Milestone: v1.0 — MVP
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**Shipped:** 2026-03-26
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**Phases:** 4 | **Plans:** 11 | **Timeline:** 3 days (2026-03-24 -> 2026-03-26)
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**LOC:** 3,254 Go | **Files:** 84 modified
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### What Was Built
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- Config-driven packet classifier with 12 protocol rules and 4 hash-bucketed unknown classes
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- Live packet capture via pure Go go-pcap with privilege detection and non-blocking channel pipeline
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- Additive synthesis engine: per-class oscillators, EMA amplitude smoothing, constant-power stereo mixing
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- MP3 encoding via embedded LAME, zero-packet guard
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- End-to-end pipeline with clean Ctrl+C shutdown
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- BPF filter and offline pcap file sonification with timestamp-based windowing
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### What Worked
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- Risk-ordered phases: hardest foundation first (capture), then synthesis in isolation, then integration — no phase blocked on another's bugs
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- TDD approach in executor agents caught signature mismatches early
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- Pure Go capture layer (go-pcap) avoided libpcap dependency headaches
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- Hand-rolled synthesis kept dependencies minimal and code understandable
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- Wave-based parallel execution for independent plans
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### What Was Inefficient
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- Some SUMMARY.md files had empty one-liner fields, causing noisy milestone extraction
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- Phase 4 research could have been lighter — BPF/pcap APIs were straightforward
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### Patterns Established
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- Ordered []Rule slice for classifier (first-match-wins, extensible)
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- io.Writer injection for testable stderr output
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- Buffered channels between pipeline stages (512-1024) to absorb bursts
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- Package-level globals for Cobra flag binding
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- Timestamp-based windowing for non-live sources
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### Key Lessons
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- Embedding C source (go-lame) is a good tradeoff: CGo at build time only, no runtime dependency
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- go-audio/wav was unnecessary — writing PCM bytes directly to LameWriter is simpler
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- Hash-bucketed unknowns (4 classes) are sufficient for audio distinction without k-means complexity
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## Cross-Milestone Trends
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| Metric | v1.0 |
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|--------|------|
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| Phases | 4 |
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| Plans | 11 |
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| Days | 3 |
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| LOC | 3,254 |
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| Avg plan duration | ~8 min |
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