yoloyolo/.planning/phases/01-capture-and-classification/01-03-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
01-capture-and-classification	03	aggregation	go channels goroutines time-windows io-writer stderr-output	phase provides 01-capture-and-classification classify.ClassifiedPacket and classify.WindowSnapshot types from classify/types.go (Plan 01)	Ticker-driven Aggregate function reading ClassifiedPackets, emitting WindowSnapshots per time window PrintSummary for final per-protocol packet counts with percentages to io.Writer PrintWindowLine for verbose per-window activity output AccumulateTotals for merging snapshot counts into cumulative totals	02-audio-synthesis audio-engine-phase	added patterns Aggregate pattern: done+events+ticker select loop with flush-on-done io.Writer injection for testable output (bytes.Buffer in tests, os.Stderr in main) Sorted output via sort.Strings on map keys for deterministic stderr display	created modified aggregate/window.go aggregate/window_test.go aggregate/summary.go aggregate/summary_test.go	DefaultWindowMs=500: 500ms windows balance temporal resolution against snapshot frequency onSnapshot callback in Aggregate for optional verbose mode, nil-safe (no overhead when not verbose) io.Writer injection in PrintSummary/PrintWindowLine enables unit-test capture via bytes.Buffer and production use via os.Stderr	Pattern: aggregate package bridges classify output to Phase 2 audio synthesis via WindowSnapshot channel Pattern: AccumulateTotals + PrintSummary separation keeps formatting logic independent of accumulation	CLAS-03 CLAS-04	8min	2026-03-25

Phase 01 Plan 03: Aggregation and Stats Reporting Summary

Ticker-driven window aggregator with per-class packet counting, verbose per-window stdout lines, and sorted exit protocol summary — bridging packet classification to Phase 2 audio synthesis

Performance

• Duration: ~8 min
• Started: 2026-03-25T11:15:42Z
• Completed: 2026-03-25T11:23:00Z
• Tasks: 2
• Files modified: 4

Accomplishments

• Aggregate goroutine accumulates ClassifiedPackets into time windows using done+events+ticker select loop, emitting WindowSnapshot per tick and flushing partial window on done
• PrintSummary renders per-protocol packet counts with percentages and TOTAL line to any io.Writer, sorted alphabetically for deterministic output
• PrintWindowLine renders per-window verbose activity line in "[window N] CLASS:count (total: N)" format
• AccumulateTotals merges snapshot counts into cumulative totals for use with PrintSummary on exit
• 11 unit tests total passing across both files (no race detector — CGO_ENABLED=0 environment)

Task Commits

Each task was committed atomically:

1. Task 1: Ticker-driven window aggregator - 2a8fd7d (feat)
2. Task 2: Exit summary and verbose window output - f2bebaf (feat)

Plan metadata: TBD (docs: complete plan)

Note: TDD tasks had test → feat commit pattern per task.

Files Created/Modified

• aggregate/window.go - Aggregate function with done/events/ticker select loop and DefaultWindowMs constant
• aggregate/window_test.go - 5 tests: EmitsSnapshot, MultipleClasses, DoneFlushesPartial, EmptyWindow, WindowIndex
• aggregate/summary.go - PrintSummary, PrintWindowLine, AccumulateTotals functions
• aggregate/summary_test.go - 6 tests: PrintSummary, PrintSummaryEmpty, PrintSummarySorted, PrintWindowLine, PrintWindowLineEmpty, AccumulateTotals

Decisions Made

• DefaultWindowMs set to 500ms (0.5 seconds) — matches typical human perception granularity for network bursts without overwhelming snapshot channel
• onSnapshot callback passed as nil-safe function pointer into Aggregate; main.go will set this to PrintWindowLine when --verbose flag is active, zero overhead otherwise
• io.Writer interface chosen over os.Stderr hardcoding — allows test capture with bytes.Buffer while production code passes os.Stderr

Deviations from Plan

None — plan executed exactly as written.

One note: -race flag requires CGO_ENABLED=1, which is not available in this build environment. Tests were run without the race detector (go test -v -count=1 ./aggregate/...) and passed. The race-detector requirement from the plan verification section cannot be satisfied without CGO. This is a pre-existing environment constraint, not a code issue.

Issues Encountered

• go test -race requires CGO_ENABLED=1 (LAME's CGo requirement). Environment has CGO_ENABLED=0. Tests ran and passed without -race flag.

User Setup Required

None — no external service configuration required.

Next Phase Readiness

• aggregate package ready for Phase 2 audio synthesis wiring
• Aggregate output channel (WindowSnapshot) is the contract Phase 2 audio engine consumes
• Main CLI (cmd/) will wire: capture → classify → Aggregate → audio synthesis, passing os.Stderr and --verbose flag to PrintWindowLine

Self-Check: PASSED

All claimed files exist and both task commits are present in git history.

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Phase: 01-capture-and-classification Completed: 2026-03-25