98 lines
4.4 KiB
Markdown
98 lines
4.4 KiB
Markdown
# AGENTS.md
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Guidance for AI coding agents working in this repository.
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## What this is
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A single-host computer dashboard and task manager: FastAPI (Python ≥ 3.12,
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managed with `uv`) backend serving htmx + Chart.js HTML fragments to one
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browser page. Binds to `127.0.0.1:8501`, no auth by design (see the README
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security section). Tabs: Overview, Disks, Processes, Journal, Services
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(systemd), Plugins (llama.cpp, sleep, LACT). Licensed under the Unlicense
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(see `LICENSE`).
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## Commands
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```sh
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uv sync # install dependencies
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uv run python main.py # run the server on http://127.0.0.1:8501
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```
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There is no test suite. Verify changes with:
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```sh
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uv run python -m compileall -q app
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curl -s -o /dev/null -w "%{http_code}\n" http://127.0.0.1:8501/api/overview
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# ... other endpoints: /api/disks /api/processes /api/journal /api/services
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# /api/plugins /api/history
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grep -c Traceback /tmp/dash.log
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```
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### Restarting the dev server
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The server usually runs detached in the background. To restart it:
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```sh
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PID=$(pgrep -f "python main\.py" | head -1)
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[ -n "$PID" ] && kill "$PID"
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setsid nohup uv run python main.py > /tmp/dash.log 2>&1 < /dev/null & disown
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```
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Never use `pkill -f "uv run python main.py"` — the pattern also matches the
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agent's own shell command line and kills the session.
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## Architecture
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- `app/collect/*` — collectors (cpu/mem/gpu/disks/procs/net/power) read
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psutil + sysfs; `app/sampling.py` runs them every `DASH_SAMPLE_INTERVAL`
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(default 2 s) into an in-memory ring buffer (`app/state.py`).
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- `app/routers/*` — each tab endpoint is an idempotent GET returning an htmx
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HTML fragment; templates live in `templates/` and self-poll via
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`hx-get` + `hx-trigger="every Ns"` + `hx-swap="outerHTML"`.
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- `templates/*.html` auto-reload on file change — no restart needed for
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template-only edits. Python changes require a restart.
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- `app/systemd/units.py` — systemd unit listing/detail/actions;
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`app/journal.py` — `journalctl -o export` parser with cursors.
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- `app/plugins/` — `base.Plugin` (optional `open`/`close` lifecycle hooks run
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from app lifespan) + llamacpp plugin (talks to a router-mode `llama-server`
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on port 8080) + sleep plugin (lists block-mode `systemd-inhibit` locks;
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holds its own sleep lock via a `systemd-inhibit ... sleep infinity` child
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while the UI switch is on, reaps stale locks by `who` marker on startup)
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+ lact plugin (shells out to `lact cli`: per-GPU profile dropdown with
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set/reload, active profile polled every 5 s, GPU names shortened with
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`app/collect/gpu.py:shorten` like the overview card).
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## Conventions
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- Google-style docstrings for every function and class: one-line imperative
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summary, an `Args:` section for each parameter, and `Returns:`/`Raises:`
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where non-obvious. Complex functions (parsers, subprocess wrappers,
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anything touching the pitfalls below) get extra prose explaining the
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behaviour, not just the signature.
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- Inline comments are allowed only for `Sample` dataclass field docs.
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- basedpyright is configured as linter, use with `uvx`.
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- Match surrounding style; keep functions small and typed where the codebase already is.
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- Keep polling endpoints cheap: collectors may cache lookups (unit names,
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enabled-state maps, SSID, temperature paths) with short TTLs.
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## Hard-won pitfalls
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- Jinja autoescape renders `↓` as literal text — use literal unicode
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(e.g. `↓`) in templates.
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- `journalctl -o export` output contains NUL bytes (grep treats it as
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binary); journalctl rejects negated matches (`!`/`!=`) — filter entries in
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Python instead.
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- psutil gotchas: there is no `psutil.AF_INET` (use `socket`);
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`net_if_addrs()` / `net_if_stats()` take no arguments;
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`sensors_battery().power_plugged` can be `None` — use
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`/sys/class/power_supply/*` (type/capacity/status/online) for battery + AC
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state.
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- `iw dev <if> link` prints `SSID: name` **unquoted**; the working regex is
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`SSID:\s+(\S.*)` (a `$` anchor fails without MULTILINE).
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- `/api/history` window-averages the ring buffer down to at most
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`chart_max_points` (default 200) points, emitting `{avg, min, max}` per key,
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and pads each of the three arrays with `null` for windows missing a key so
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they stay aligned with the timestamps — keep that behaviour if you touch it.
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- AMD sysfs: GPU busy/VRAM/temp under
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`/sys/class/drm/card*/device` (+ `hwmon`), CPU temp from the `k10temp`
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hwmon (fallback `acpitz` thermal zone), both in millidegrees.
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