146 lines
5.3 KiB
Markdown
146 lines
5.3 KiB
Markdown
# Pi Dashboard Servers
|
||
|
||
WebSocket servers that feed system stats, alarm audio, and status images to the ESP32-S3 RLCD dashboard.
|
||
|
||
## File Structure
|
||
|
||
```
|
||
run_all.py # Launches both servers as child processes
|
||
stats_server.py # Real system stats over WebSocket (port 8765)
|
||
contents_server.py # Alarm audio + status images over WebSocket (port 8766)
|
||
mock_server.py # Drop-in replacement for stats_server with random data
|
||
audio_handler.py # WAV loading, PCM chunking, alarm streaming
|
||
image_handler.py # PNG to 1-bit monochrome conversion, alpha compositing
|
||
alarm_scheduler.py # Loads and validates alarm config, checks firing schedule
|
||
requirements.txt
|
||
config/
|
||
alarms.json # Alarm schedule configuration
|
||
assets/
|
||
alarm/ # WAV files for alarm audio
|
||
img/ # Status images (idle.png, on_alarm.png, sleep.png)
|
||
scripts/
|
||
setup.sh # Install deps + create and enable systemd service
|
||
edit.sh # Edit alarm config and restart service
|
||
remove.sh # Stop, disable, and remove systemd service
|
||
```
|
||
|
||
## Requirements
|
||
|
||
Python 3.10+
|
||
|
||
```
|
||
pip install -r requirements.txt
|
||
```
|
||
|
||
Dependencies: `websockets`, `psutil`, `Pillow`
|
||
|
||
## Running
|
||
|
||
Start both servers:
|
||
|
||
```
|
||
python run_all.py # both servers, default config
|
||
python run_all.py --config path/to.json # both servers, custom config
|
||
```
|
||
|
||
Or run individually:
|
||
|
||
```
|
||
python stats_server.py # port 8765 only
|
||
python contents_server.py --config path/to.json # port 8766, custom config
|
||
python mock_server.py # port 8765, random data (no psutil needed)
|
||
```
|
||
|
||
### Running as a systemd service
|
||
|
||
Use the helper scripts in `scripts/` to manage a `pi-dashboard` systemd service:
|
||
|
||
```bash
|
||
bash scripts/setup.sh # install deps, create + enable service
|
||
bash scripts/edit.sh # edit alarm config, restart service
|
||
bash scripts/remove.sh # stop + remove service
|
||
```
|
||
|
||
## Servers
|
||
|
||
### stats_server.py -- port 8765
|
||
|
||
Pushes a JSON object every 2 seconds with real system metrics from `psutil`:
|
||
|
||
- `cpu_pct`, `mem_pct`, `mem_used_mb`, `disk_pct`
|
||
- `cpu_temp` (reads `/sys/class/thermal/` as fallback)
|
||
- `uptime_hrs`, `net_rx_kbps`, `net_tx_kbps` (values are in kB/s despite the field names)
|
||
- `services` — live Docker container statuses via `docker ps -a`, with a ternary status model (`running`, `warning`, `stopped`). Monitored containers: gitea, samba, pihole, qbittorrent, frpc (ny), pinepods, frpc (ssh), jellyfin.
|
||
- `local_time` fields for RTC sync (`y`, `mo`, `d`, `h`, `m`, `s`)
|
||
|
||
### contents_server.py -- port 8766
|
||
|
||
Serves alarm audio and status images. Protocol:
|
||
|
||
**Status image:**
|
||
1. Text frame: `{"type":"status_image","width":200,"height":200}`
|
||
2. Binary frame: 1-bit monochrome bitmap (5000 bytes)
|
||
|
||
**Alarm audio:**
|
||
1. Text frame: `{"type":"alarm_start","sample_rate":N,"channels":N,"bits":N}`
|
||
2. Binary frames: raw PCM chunks (4096 bytes each, paced at ~90% real-time)
|
||
3. Text frame: `{"type":"alarm_stop"}`
|
||
|
||
Loads alarm config from `config/alarms.json` (override with `--config`). Checks schedule every 5 seconds, fires once per matched minute. If no config or empty config, sends idle image and blocks forever. On alarm: switches to alarm image, streams audio, switches back to idle.
|
||
|
||
### mock_server.py -- port 8765
|
||
|
||
Same JSON schema and 2-second push interval as `stats_server.py`, but all values are randomized. No `psutil` dependency -- useful for development on non-Pi machines.
|
||
|
||
Does not include `local_time` fields.
|
||
|
||
## Alarm Configuration
|
||
|
||
Config file: `config/alarms.json` -- a single alarm object or an array of alarm objects.
|
||
|
||
Example with two alarms:
|
||
|
||
```json
|
||
[
|
||
{
|
||
"alarm_time": "0730",
|
||
"alarm_days": ["Mon", "Tue", "Wed", "Thu", "Fri"],
|
||
"alarm_audio": "assets/alarm/alarm_test.wav",
|
||
"alarm_image": "assets/img/on_alarm.png"
|
||
},
|
||
{
|
||
"alarm_time": "2300",
|
||
"alarm_audio": "assets/alarm/sleep.wav",
|
||
"alarm_image": "assets/img/sleep.png"
|
||
}
|
||
]
|
||
```
|
||
|
||
| Field | Type | Required | Description |
|
||
|-------|------|----------|-------------|
|
||
| `alarm_time` | `string` | Yes | 4-digit HHMM, 24-hour. Fires on the matched minute. |
|
||
| `alarm_days` | `string[]` | No | 3-letter abbreviations: `Mon`–`Sun`. If omitted, fires every day. |
|
||
| `alarm_dates` | `string[]` | No | `MM/DD` strings. Ignored if `alarm_days` is also set. |
|
||
| `alarm_audio` | `string` | No | WAV path, relative to project root. Default: `assets/alarm/alarm_test.wav`. |
|
||
| `alarm_image` | `string` | No | Status PNG path, relative to project root. Default: `assets/img/on_alarm.png`. |
|
||
|
||
If both `alarm_days` and `alarm_dates` are present, `alarm_days` takes priority.
|
||
|
||
## Modules
|
||
|
||
### audio_handler.py
|
||
|
||
- `find_wav(path=None)` -- uses the given path if it exists, otherwise falls back to glob in `assets/alarm/`
|
||
- `read_wav(path)` -- reads WAV, normalizes audio to 0 dBFS, returns `(pcm_bytes, sample_rate, channels, bits)`
|
||
- `stream_alarm(ws, pcm, sr, ch, bits)` -- streams one alarm cycle over WebSocket
|
||
|
||
### image_handler.py
|
||
|
||
- `load_status_image(path)` -- loads PNG, composites transparency onto white, converts to 1-bit 200x200 monochrome bitmap (black=1, MSB-first)
|
||
- `send_status_image(ws, img_bytes)` -- sends status image header + binary over WebSocket
|
||
|
||
### alarm_scheduler.py
|
||
|
||
- `load_config(path)` -- reads and validates alarm JSON; returns list of alarm dicts or `None`
|
||
- `should_fire(config)` -- checks a single alarm entry against current local time
|