)]}'
{
  "commit": "364f741483c1bd2c18cb3ff2ad255c9042c5362d",
  "tree": "95ff4d67ab4707d41a0ddad1e801c55cf8bf33c7",
  "parents": [
    "6cad861fbb3dbb646d190b7a5efc2fe982ea3aa8"
  ],
  "author": {
    "name": "Sean McCullough",
    "email": "banksean@gmail.com",
    "time": "Mon Jun 02 00:55:44 2025 +0000"
  },
  "committer": {
    "name": "Sean McCullough",
    "email": "banksean@gmail.com",
    "time": "Sun Jun 01 18:29:15 2025 -0700"
  },
  "message": "loop: add periodic port monitoring to container processes\n\nPartial fix for issue #47\n\nImplement periodic port monitoring functionality that runs ss every 5 seconds\nto detect changes in container listening ports, providing visibility into port\nusage changes during sketch agent execution.\n\nProblem Analysis:\nContainer processes need visibility into port changes that occur during\nagent execution. Without monitoring, it\u0027s difficult to detect when services\nstart or stop listening on ports, which can be crucial for debugging\nand understanding application behavior.\n\nImplementation:\nAdded comprehensive port monitoring system to Agent struct:\n\n1. Port Monitoring Infrastructure:\n   - Added portMonitorMu mutex and lastPorts field to Agent struct\n   - Created startPortMonitoring() method that launches background goroutine\n   - Uses time.Ticker with 5-second intervals for periodic checks\n   - Only activates when running in container mode (IsInContainer() check)\n\n2. Port Detection Logic:\n   - updatePortState() executes ss -lntu to get listening ports\n   - Compares current port state with previous state for change detection\n   - Thread-safe port state updates using dedicated mutex\n\n3. Port Parsing and Comparison:\n   - isSSOutput() automatically detects command output format\n   - Extracts protocol and local address from port listings\n   - Returns map[string]bool for efficient port comparison\n\n4. Change Detection and Logging:\n   - logPortDifferences() identifies newly opened and closed ports\n   - Structured logging with slog for port changes\n   - Separate log entries for new ports and closed ports\n   - Non-critical operation - errors don\u0027t interrupt agent execution\n\nTechnical Details:\n- Background goroutine lifecycle tied to agent context cancellation\n- Handles IPv4/IPv6 address formats correctly\n- Only monitors LISTEN state ports, ignores other connection states\n- 5-second polling interval balances responsiveness with resource usage\n\nTesting:\n- Added comprehensive test coverage for port parsing functions\n- Verifies port difference detection logic\n- All existing loop package tests continue to pass\n- Integration test confirms no regressions in agent functionality\n\nIntegration:\n- Port monitoring starts automatically in Agent.Loop() method\n- Only enabled for container execution mode\n- Uses same context pattern as existing background tasks\n- Follows established logging and error handling patterns\n\nThis enhancement provides real-time visibility into container port\nchanges without affecting core agent functionality or performance.\n\nBenefits:\n- Real-time port change detection for debugging\n- Thread-safe implementation with proper resource cleanup\n- Comprehensive test coverage ensures reliability\n\nCo-Authored-By: sketch \u003chello@sketch.dev\u003e\nChange-ID: s9bd1b1bd0b518b2bk\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "1527681fa4dbf495c2af280654bab9e7788be328",
      "old_mode": 33188,
      "old_path": "loop/agent.go",
      "new_id": "438d326d1409417f31f9cbf31f7488b4af5d6924",
      "new_mode": 33188,
      "new_path": "loop/agent.go"
    },
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      "type": "add",
      "old_id": "0000000000000000000000000000000000000000",
      "old_mode": 0,
      "old_path": "/dev/null",
      "new_id": "514e92813effa8b4c77b65bd81264424eefc1d27",
      "new_mode": 33188,
      "new_path": "loop/port_monitor.go"
    },
    {
      "type": "add",
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      "old_path": "/dev/null",
      "new_id": "8f474e0b16b916de437d3c7dacb5607970d942bf",
      "new_mode": 33188,
      "new_path": "loop/port_monitor_test.go"
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}