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https://github.com/smittix/intercept.git
synced 2026-04-24 06:40:00 -07:00
feat: Add VHF DSC Channel 70 monitoring and decoding
- Implement DSC message decoding (Distress, Urgency, Safety, Routine) - Add MMSI country identification via MID lookup - Integrate position extraction and map markers for distress alerts - Implement device conflict detection to prevent SDR collisions with AIS - Add permanent storage for critical alerts and visual UI overlays
This commit is contained in:
Marc
@@ -352,6 +352,39 @@ def init_db() -> None:
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ON tscm_cases(status, created_at)
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''')
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# =====================================================================
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# DSC (Digital Selective Calling) Tables
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# =====================================================================
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# DSC Alerts - Permanent storage for DISTRESS/URGENCY messages
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conn.execute('''
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CREATE TABLE IF NOT EXISTS dsc_alerts (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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received_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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source_mmsi TEXT NOT NULL,
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source_name TEXT,
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dest_mmsi TEXT,
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format_code TEXT NOT NULL,
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category TEXT NOT NULL,
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nature_of_distress TEXT,
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latitude REAL,
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longitude REAL,
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raw_message TEXT,
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acknowledged BOOLEAN DEFAULT 0,
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notes TEXT
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)
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''')
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conn.execute('''
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CREATE INDEX IF NOT EXISTS idx_dsc_alerts_category
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ON dsc_alerts(category, received_at)
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''')
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conn.execute('''
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CREATE INDEX IF NOT EXISTS idx_dsc_alerts_mmsi
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ON dsc_alerts(source_mmsi, received_at)
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''')
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logger.info("Database initialized successfully")
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@@ -1455,3 +1488,192 @@ def get_sweep_capabilities(sweep_id: int) -> dict | None:
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'limitations': json.loads(row['limitations']) if row['limitations'] else [],
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'recorded_at': row['recorded_at']
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}
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# =============================================================================
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# DSC (Digital Selective Calling) Functions
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# =============================================================================
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def store_dsc_alert(
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source_mmsi: str,
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format_code: str,
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category: str,
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source_name: str | None = None,
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dest_mmsi: str | None = None,
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nature_of_distress: str | None = None,
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latitude: float | None = None,
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longitude: float | None = None,
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raw_message: str | None = None
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) -> int:
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"""
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Store a DSC alert (typically DISTRESS or URGENCY) to permanent storage.
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Returns:
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The ID of the created alert
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"""
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with get_db() as conn:
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cursor = conn.execute('''
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INSERT INTO dsc_alerts
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(source_mmsi, source_name, dest_mmsi, format_code, category,
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nature_of_distress, latitude, longitude, raw_message)
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VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
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''', (
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source_mmsi, source_name, dest_mmsi, format_code, category,
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nature_of_distress, latitude, longitude, raw_message
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))
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return cursor.lastrowid
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def get_dsc_alerts(
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category: str | None = None,
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acknowledged: bool | None = None,
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source_mmsi: str | None = None,
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limit: int = 100,
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offset: int = 0
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) -> list[dict]:
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"""
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Get DSC alerts with optional filters.
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Args:
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category: Filter by category (DISTRESS, URGENCY, SAFETY, ROUTINE)
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acknowledged: Filter by acknowledgement status
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source_mmsi: Filter by source MMSI
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limit: Maximum number of results
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offset: Offset for pagination
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Returns:
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List of DSC alert records
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"""
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conditions = []
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params = []
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if category is not None:
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conditions.append('category = ?')
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params.append(category)
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if acknowledged is not None:
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conditions.append('acknowledged = ?')
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params.append(1 if acknowledged else 0)
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if source_mmsi is not None:
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conditions.append('source_mmsi = ?')
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params.append(source_mmsi)
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where_clause = f'WHERE {" AND ".join(conditions)}' if conditions else ''
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params.extend([limit, offset])
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with get_db() as conn:
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cursor = conn.execute(f'''
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SELECT * FROM dsc_alerts
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{where_clause}
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ORDER BY received_at DESC
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LIMIT ? OFFSET ?
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''', params)
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results = []
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for row in cursor:
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results.append({
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'id': row['id'],
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'received_at': row['received_at'],
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'source_mmsi': row['source_mmsi'],
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'source_name': row['source_name'],
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'dest_mmsi': row['dest_mmsi'],
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'format_code': row['format_code'],
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'category': row['category'],
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'nature_of_distress': row['nature_of_distress'],
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'latitude': row['latitude'],
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'longitude': row['longitude'],
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'raw_message': row['raw_message'],
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'acknowledged': bool(row['acknowledged']),
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'notes': row['notes']
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})
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return results
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def get_dsc_alert(alert_id: int) -> dict | None:
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"""Get a specific DSC alert by ID."""
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with get_db() as conn:
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cursor = conn.execute(
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'SELECT * FROM dsc_alerts WHERE id = ?',
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(alert_id,)
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)
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row = cursor.fetchone()
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if not row:
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return None
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return {
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'id': row['id'],
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'received_at': row['received_at'],
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'source_mmsi': row['source_mmsi'],
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'source_name': row['source_name'],
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'dest_mmsi': row['dest_mmsi'],
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'format_code': row['format_code'],
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'category': row['category'],
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'nature_of_distress': row['nature_of_distress'],
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'latitude': row['latitude'],
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'longitude': row['longitude'],
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'raw_message': row['raw_message'],
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'acknowledged': bool(row['acknowledged']),
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'notes': row['notes']
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}
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def acknowledge_dsc_alert(alert_id: int, notes: str | None = None) -> bool:
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"""
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Acknowledge a DSC alert.
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Args:
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alert_id: The alert ID to acknowledge
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notes: Optional notes about the acknowledgement
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Returns:
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True if alert was found and updated, False otherwise
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"""
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with get_db() as conn:
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if notes:
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cursor = conn.execute(
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'UPDATE dsc_alerts SET acknowledged = 1, notes = ? WHERE id = ?',
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(notes, alert_id)
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)
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else:
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cursor = conn.execute(
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'UPDATE dsc_alerts SET acknowledged = 1 WHERE id = ?',
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(alert_id,)
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)
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return cursor.rowcount > 0
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def get_dsc_alert_summary() -> dict:
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"""Get summary counts of DSC alerts by category."""
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with get_db() as conn:
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cursor = conn.execute('''
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SELECT category, COUNT(*) as count
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FROM dsc_alerts
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WHERE acknowledged = 0
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GROUP BY category
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''')
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summary = {'distress': 0, 'urgency': 0, 'safety': 0, 'routine': 0, 'total': 0}
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for row in cursor:
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cat = row['category'].lower()
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if cat in summary:
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summary[cat] = row['count']
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summary['total'] += row['count']
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return summary
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def cleanup_old_dsc_alerts(max_age_days: int = 30) -> int:
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"""
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Remove old acknowledged DSC alerts (keeps unacknowledged ones).
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Args:
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max_age_days: Maximum age in days for acknowledged alerts
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Returns:
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Number of deleted alerts
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"""
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with get_db() as conn:
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cursor = conn.execute('''
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DELETE FROM dsc_alerts
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WHERE acknowledged = 1
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AND received_at < datetime('now', ?)
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''', (f'-{max_age_days} days',))
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return cursor.rowcount
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