Mikkel Georgsen
85b83b2b17
Tasks completed: 1/1 - Create ClaudeSubprocess module with spawn, I/O, and lifecycle management SUMMARY: .planning/phases/01-session-process-foundation/01-02-SUMMARY.md
122 lines
5 KiB
Markdown
122 lines
5 KiB
Markdown
---
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phase: 01-session-process-foundation
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plan: 02
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subsystem: infra
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tags: [asyncio, subprocess, python, claude-code-cli, stream-json, process-management]
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# Dependency graph
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requires:
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- phase: 01-session-process-foundation
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provides: Session metadata and directory management
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provides:
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- Claude Code subprocess lifecycle management with crash recovery
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- Stream-json event parsing and routing to callbacks
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- Concurrent stdout/stderr reading to prevent pipe deadlocks
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- Message queueing during Claude processing
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- Graceful process termination without zombies
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affects: [01-03, telegram-integration, message-handling]
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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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- "Asyncio subprocess management with concurrent stream readers"
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- "Stream-json event routing to callback functions"
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- "Crash recovery with --continue flag"
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- "terminate() + wait_for() + kill() fallback pattern"
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key-files:
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created:
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- telegram/claude_subprocess.py
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modified: []
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key-decisions:
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- "Use asyncio.gather for concurrent stdout/stderr reading (prevents pipe deadlock)"
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- "Queue messages during processing, send after completion"
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- "Auto-restart on crash with --continue flag (max 3 retries)"
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- "Spawn fresh process per turn (not stdin piping) for Phase 1 simplicity"
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patterns-established:
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- "Pattern 1: Concurrent stream reading - Always use asyncio.gather() for stdout/stderr to prevent pipe buffer overflow deadlocks"
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- "Pattern 2: Process lifecycle - terminate() + wait_for(timeout) + kill() + wait() ensures no zombies"
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- "Pattern 3: Stream-json parsing - Line-by-line JSON.loads() with try/except, route by event type"
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- "Pattern 4: Callback architecture - on_output/on_error/on_complete/on_status for decoupled communication"
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# Metrics
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duration: 9min
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completed: 2026-02-04
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---
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# Phase 1 Plan 2: ClaudeSubprocess Module Summary
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**Asyncio-based Claude Code subprocess engine with concurrent stream reading, message queueing, crash recovery, and stream-json event routing via callbacks**
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## Performance
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- **Duration:** 9 minutes
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- **Started:** 2026-02-04T17:32:07Z
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- **Completed:** 2026-02-04T17:41:16Z
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- **Tasks:** 1
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- **Files modified:** 1
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## Accomplishments
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- Created ClaudeSubprocess class that spawns Claude Code CLI with stream-json output
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- Implemented concurrent stdout/stderr reading via asyncio.gather to prevent pipe deadlocks
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- Built message queueing system for messages received during Claude processing
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- Implemented crash recovery with auto-restart using --continue flag (max 3 retries)
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- Added graceful process termination with terminate → wait_for → kill → wait pattern (no zombies)
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- Established callback-based architecture for decoupled communication with session manager
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create ClaudeSubprocess module with spawn, I/O, and lifecycle management** - `8fce10c` (feat)
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## Files Created/Modified
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- `telegram/claude_subprocess.py` - Claude Code subprocess lifecycle management with asyncio, handles spawning with persona settings, concurrent stream reading, stream-json event parsing, message queueing, crash recovery, and graceful termination
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## Decisions Made
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1. **Concurrent stream reading pattern**: Use `asyncio.gather()` to read stdout and stderr concurrently, preventing pipe buffer deadlock (verified by research as critical pattern)
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2. **Message queueing strategy**: Queue messages in `asyncio.Queue` while subprocess is busy, process queue after completion callback. This ensures messages don't interrupt active processing.
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3. **Crash recovery approach**: Auto-restart with `--continue` flag up to 3 times with 1-second backoff. Claude Code's session persistence in `.claude/` directory enables context preservation across crashes.
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4. **Fresh process per turn**: Spawn new `claude -p` invocation for each turn rather than piping to stdin. Simpler for Phase 1; Phase 2+ might use `--input-format stream-json` for live piping.
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5. **Callback architecture**: Decouple subprocess management from session management via callbacks (on_output, on_error, on_complete, on_status). Enables clean separation of concerns.
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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 - implementation followed research patterns without issues.
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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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**Ready for Plan 03 (Telegram Integration):**
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- ClaudeSubprocess provides complete subprocess lifecycle management
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- Callback architecture enables clean integration with Telegram bot message handlers
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- Message queueing handles concurrent messages during processing
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- Process termination and crash recovery are production-ready
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**Integration points for Plan 03:**
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- Pass Telegram message text to `send_message()`
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- Route `on_output` callback to Telegram message sending
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- Route `on_error` callback to Telegram error notifications
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- Use `on_status` callback for typing indicators
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- Call `terminate()` during session cleanup/switching
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**No blockers or concerns.**
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---
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*Phase: 01-session-process-foundation*
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*Completed: 2026-02-04*
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