130 lines
3.6 KiB
Python
130 lines
3.6 KiB
Python
#!/usr/bin/env python3
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import math
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import time
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import sqlite3
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from datetime import datetime
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import serial
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import click
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seg_map = {
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" ": 0x00,
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"a": 0x2e,
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"b": 0xd6,
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"c": 0xd0,
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"d": 0xc5,
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"e": 0x59,
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"f": 0x98,
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"g": 0xd4,
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"h": 0x8c,
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"i": 0x5c,
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"j": 0x78,
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"k": 0x8e,
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"l": 0xc0,
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"m": 0xa3,
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"n": 0xa5,
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"o": 0xf0,
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"p": 0x93,
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"q": 0xf4,
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"r": 0x9e,
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"s": 0x55,
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"t": 0xc8,
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"u": 0xe0,
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"v": 0x8a,
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"w": 0xac,
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"x": 0x0f,
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"y": 0x0b,
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"z": 0x5a,
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"0": 0x13,
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"1": 0x20,
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"2": 0x16,
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"3": 0x56,
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"4": 0x23,
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"5": 0x1c,
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"6": 0x4e,
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"7": 0x1a,
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"8": 0x5f,
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"9": 0x33,
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"/": 0x0a,
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"\\": 0x05,
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".": 0x04,
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",": 0x08,
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"_": 0x40,
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"!": 0x53,
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"?": 0x52,
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"*": 0x0f,
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":": 0x50,
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"(": 0x06,
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"<": 0x06,
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"[": 0xd0,
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")": 0x09,
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">": 0x09,
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"]": 0x70,
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"|": 0x20,
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"#": 0xff,
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}
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@click.command()
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@click.option('-b', '--baudrate', type=int, default=9600)
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@click.option('-w', '--display-width', type=int, default=32)
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@click.option('-i', '--message-interval', type=float, default=30)
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@click.argument('database')
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@click.argument('port')
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def cli(database, port, baudrate, message_interval, display_width):
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db = sqlite3.connect(database)
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ser = serial.Serial(port, baudrate)
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discard = 0
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while True:
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count, = db.execute('''
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SELECT COUNT(*) FROM messages
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WHERE suppress_display = 0 AND timestamp_displayed IS NULL
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ORDER BY timestamp_received''').fetchone()
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if count == 0:
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print(f'Queue is empty. Sleeping.')
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time.sleep(1)
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continue
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queue_pressure = max(0, min((math.log10(max(1, count-3)) - 0.3) * message_interval*2/3, message_interval*1/3))
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interval = message_interval - queue_pressure
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rowid, message, timestamp, remote_ip, suppress_display = db.execute('''
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SELECT rowid, message, timestamp_received, remote_ip, suppress_display FROM messages
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WHERE timestamp_displayed IS NULL
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ORDER BY timestamp_received LIMIT 1
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''').fetchone()
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timestamp = datetime.fromisoformat(timestamp)
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delta = (datetime.utcnow() - timestamp).total_seconds()
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db.execute('UPDATE messages SET timestamp_displayed = datetime("now") WHERE rowid=?', (rowid,))
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db.commit()
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if suppress_display:
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discard += 1
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else:
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if discard > 0:
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print(f'Discarded {discard} messages.')
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discard = 0
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print(f'Queueing message by {remote_ip} received at {timestamp} ({delta//60:.0f}m {delta%60:.0f}s ago):')
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print(' ', repr(message))
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lines = [ line for line in message.splitlines() if line.strip() ]
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interval = max(5, interval/len(lines))
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for i, line in enumerate(lines):
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print(f' [Line {i+1}/{len(lines)}] Waiting interval of {message_interval:.1f} s with queue pressure {queue_pressure:.1f} from n={count} items for a total of {interval:.1f} s')
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line = line.center(display_width)[:display_width]
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line_mapped = [seg_map.get(c, seg_map['#']) for c in line]
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formatted = ''.join(f'{d:02x}' for d in line_mapped) + '\n'
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time.sleep(interval)
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ser.write(formatted)
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ser.flush()
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if __name__ == '__main__':
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cli()
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