113 lines
3.6 KiB
Markdown
113 lines
3.6 KiB
Markdown
---
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phase: 03-output-distribution
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plan: 01
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subsystem: output
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tags: [csv, serde, chrono, headless, logging]
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requires:
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- phase: 01-data-pipeline
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provides: ConnectionRecord model and ConnectionTable aggregator
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- phase: 02-interactive-tui
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provides: Cli struct with clap derive, run_linux TUI event loop
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provides:
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- CsvRow and CsvLogger for CSV snapshot output
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- --log <path> CLI flag for headless mode
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- run_headless async event loop (no TUI dependency)
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affects: [03-output-distribution]
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tech-stack:
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added: [serde 1.x, csv 1.4, chrono 0.4, tempfile 3 (dev)]
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patterns: [TDD red-green for new modules, headless/TUI branch before terminal init]
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key-files:
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created:
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- tcptop/src/csv_writer.rs
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- tcptop/tests/csv_test.rs
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modified:
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- Cargo.toml
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- tcptop/Cargo.toml
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- tcptop/src/lib.rs
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- tcptop/src/main.rs
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key-decisions:
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- "CSV uses serde Serialize derive for type-safe column mapping (16 fields)"
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- "Headless branch before ratatui::init prevents terminal corruption"
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- "Single timestamp per tick ensures CSV row consistency"
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patterns-established:
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- "TDD for new modules: write failing tests first, then implement"
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- "Headless mode shares collector/aggregator setup with TUI mode"
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requirements-completed: [OUTP-01, OUTP-02, OPS-05]
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duration: 3min
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completed: 2026-03-22
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---
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# Phase 03 Plan 01: CSV Logging Summary
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**CSV logging with headless mode via --log flag using serde/csv crate, 6 tests covering header, field count, overwrite, timestamp consistency, rate precision, and protocol state**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-03-22T04:47:40Z
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- **Completed:** 2026-03-22T04:50:43Z
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- **Tasks:** 2
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- **Files modified:** 6
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## Accomplishments
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- CsvRow struct with 16 serde-serialized fields mapping from ConnectionRecord
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- CsvLogger with file creation (overwrite) and flushed snapshot writes
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- --log CLI flag branching to headless event loop before terminal init
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- 6 focused CSV tests covering all specified behaviors
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## Task Commits
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Each task was committed atomically:
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1. **Task 1 (RED): Add failing CSV tests** - `f3ce244` (test)
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2. **Task 1 (GREEN): Implement CsvRow and CsvLogger** - `8a36ae8` (feat)
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3. **Task 2: Add --log flag and headless event loop** - `39e807d` (feat)
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_TDD task had separate RED and GREEN commits._
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## Files Created/Modified
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- `tcptop/src/csv_writer.rs` - CsvRow (Serialize) and CsvLogger (write_snapshot with flush)
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- `tcptop/tests/csv_test.rs` - 6 tests: header, field count, overwrite, timestamp, rate precision, state/rtt
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- `Cargo.toml` - Added serde, csv, chrono workspace dependencies
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- `tcptop/Cargo.toml` - Added serde, csv, chrono deps; tempfile dev-dep
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- `tcptop/src/lib.rs` - Added `pub mod csv_writer`
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- `tcptop/src/main.rs` - Added --log flag, run_headless async fn, headless/TUI branching
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## Decisions Made
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- Used serde Serialize derive for CsvRow to get automatic header generation and type-safe field mapping
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- Headless mode branches before ratatui::init() to avoid terminal corruption (critical ordering)
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- Single Utc::now().to_rfc3339() call per tick ensures all rows in a snapshot share the same timestamp
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- Rate values rounded to 2 decimal places via `(x * 100.0).round() / 100.0`
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None
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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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- CSV output module ready for use
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- Headless mode compiles and is reachable via --log flag
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- Ready for packaging/distribution tasks in subsequent plans
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## Self-Check: PASSED
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All 4 created/modified files verified on disk. All 3 commit hashes found in git log.
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---
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*Phase: 03-output-distribution*
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*Completed: 2026-03-22*
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