gurix
31564ba0f5
- Add 01-03-SUMMARY.md with window aggregator and formatting outcomes - Advance STATE.md plan counter to 3/4, update progress to 75% - Record execution metrics: 8min, 2 tasks, 4 files - Mark CLAS-03 and CLAS-04 requirements complete in REQUIREMENTS.md - Update ROADMAP.md phase 1 progress (3/4 summaries)
123 lines
5.2 KiB
Markdown
123 lines
5.2 KiB
Markdown
---
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phase: 01-capture-and-classification
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plan: 03
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subsystem: aggregation
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tags: [go, channels, goroutines, time-windows, io-writer, stderr-output]
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# Dependency graph
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requires:
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- phase: 01-capture-and-classification
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provides: classify.ClassifiedPacket and classify.WindowSnapshot types from classify/types.go (Plan 01)
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provides:
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- Ticker-driven Aggregate function reading ClassifiedPackets, emitting WindowSnapshots per time window
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- PrintSummary for final per-protocol packet counts with percentages to io.Writer
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- PrintWindowLine for verbose per-window activity output
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- AccumulateTotals for merging snapshot counts into cumulative totals
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affects: [02-audio-synthesis, audio-engine-phase]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Aggregate pattern: done+events+ticker select loop with flush-on-done"
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- "io.Writer injection for testable output (bytes.Buffer in tests, os.Stderr in main)"
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- "Sorted output via sort.Strings on map keys for deterministic stderr display"
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key-files:
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created:
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- aggregate/window.go
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- aggregate/window_test.go
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- aggregate/summary.go
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- aggregate/summary_test.go
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modified: []
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key-decisions:
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- "DefaultWindowMs=500: 500ms windows balance temporal resolution against snapshot frequency"
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- "onSnapshot callback in Aggregate for optional verbose mode, nil-safe (no overhead when not verbose)"
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- "io.Writer injection in PrintSummary/PrintWindowLine enables unit-test capture via bytes.Buffer and production use via os.Stderr"
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patterns-established:
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- "Pattern: aggregate package bridges classify output to Phase 2 audio synthesis via WindowSnapshot channel"
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- "Pattern: AccumulateTotals + PrintSummary separation keeps formatting logic independent of accumulation"
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requirements-completed: [CLAS-03, CLAS-04]
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# Metrics
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duration: 8min
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completed: 2026-03-25
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---
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# Phase 01 Plan 03: Aggregation and Stats Reporting Summary
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**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**
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## Performance
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- **Duration:** ~8 min
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- **Started:** 2026-03-25T11:15:42Z
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- **Completed:** 2026-03-25T11:23:00Z
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- **Tasks:** 2
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- **Files modified:** 4
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## Accomplishments
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- Aggregate goroutine accumulates ClassifiedPackets into time windows using done+events+ticker select loop, emitting WindowSnapshot per tick and flushing partial window on done
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- PrintSummary renders per-protocol packet counts with percentages and TOTAL line to any io.Writer, sorted alphabetically for deterministic output
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- PrintWindowLine renders per-window verbose activity line in "[window N] CLASS:count (total: N)" format
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- AccumulateTotals merges snapshot counts into cumulative totals for use with PrintSummary on exit
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- 11 unit tests total passing across both files (no race detector — CGO_ENABLED=0 environment)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Ticker-driven window aggregator** - `2a8fd7d` (feat)
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2. **Task 2: Exit summary and verbose window output** - `f2bebaf` (feat)
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**Plan metadata:** TBD (docs: complete plan)
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_Note: TDD tasks had test → feat commit pattern per task._
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## Files Created/Modified
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- `aggregate/window.go` - Aggregate function with done/events/ticker select loop and DefaultWindowMs constant
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- `aggregate/window_test.go` - 5 tests: EmitsSnapshot, MultipleClasses, DoneFlushesPartial, EmptyWindow, WindowIndex
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- `aggregate/summary.go` - PrintSummary, PrintWindowLine, AccumulateTotals functions
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- `aggregate/summary_test.go` - 6 tests: PrintSummary, PrintSummaryEmpty, PrintSummarySorted, PrintWindowLine, PrintWindowLineEmpty, AccumulateTotals
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## Decisions Made
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- DefaultWindowMs set to 500ms (0.5 seconds) — matches typical human perception granularity for network bursts without overwhelming snapshot channel
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- 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
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- io.Writer interface chosen over os.Stderr hardcoding — allows test capture with bytes.Buffer while production code passes os.Stderr
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## Deviations from Plan
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None — plan executed exactly as written.
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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.
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## Issues Encountered
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- `go test -race` requires CGO_ENABLED=1 (LAME's CGo requirement). Environment has CGO_ENABLED=0. Tests ran and passed without -race flag.
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## User Setup Required
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None — no external service configuration required.
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## Next Phase Readiness
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- aggregate package ready for Phase 2 audio synthesis wiring
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- Aggregate output channel (WindowSnapshot) is the contract Phase 2 audio engine consumes
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- Main CLI (cmd/) will wire: capture → classify → Aggregate → audio synthesis, passing os.Stderr and --verbose flag to PrintWindowLine
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## Self-Check: PASSED
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All claimed files exist and both task commits are present in git history.
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---
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*Phase: 01-capture-and-classification*
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*Completed: 2026-03-25*
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