FASE 4-5-6: Infraestructura, CRM, Service Orders, Notificaciones, Ahorro, Logistica, API Publica
FASE 4: - Redis cache de stock con fallback graceful - Multi-moneda (MXN/USD) con contabilidad en MXN - Proveedores y ordenes de compra completo - Meilisearch 1.5M+ partes indexadas - Metabase KPIs con dashboard auto-generado FASE 5: - CRM mejorado: activities, tags, loyalty program, analytics - Imagenes de partes: upload, resize, thumbnails WebP - Ordenes de servicio Kanban: received->diagnosis->repair->ready->delivered - Garantias/RMA, alertas de reorden, multi-sucursal - Stubs BNPL (APLAZO) y ERP Sync (Aspel/Contpaqi) FASE 6: - Notificaciones automaticas: push/WhatsApp/email/in-app - Reportes de ahorro vs retail_price - Logistica + tracking: DHL, FedEx, Estafeta, 99min, Uber - API Publica: API keys, rate limiting, catalog search Migraciones: v1.9-v3.0 Tests: 93/93 pasando Backup: nexus_backup_20260427_045859.tar.gz
This commit is contained in:
Nexus Dev
422
pos/services/notification_engine.py
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422
pos/services/notification_engine.py
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"""Notification Engine: event-driven notifications via push, email, WhatsApp, in-app.
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Integrates with existing push_service.py for Web Push.
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Supports template rendering with Jinja2-style variable substitution.
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"""
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import re
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import json
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from datetime import datetime, timedelta
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def _render_template(template, context):
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"""Simple variable substitution: {var_name} -> value."""
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if not template:
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return ''
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result = template
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for key, value in context.items():
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if value is None:
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value = ''
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result = result.replace(f'{{{key}}}', str(value))
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return result
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def get_templates(conn, tenant_id, event_type=None, channel=None):
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cur = conn.cursor()
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params = [tenant_id]
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filters = "tenant_id = %s"
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if event_type:
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filters += " AND event_type = %s"
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params.append(event_type)
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if channel:
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filters += " AND channel = %s"
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params.append(channel)
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cur.execute(f"""
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SELECT id, event_type, channel, name, subject_template, body_template, is_active
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FROM notification_templates
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WHERE {filters}
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ORDER BY event_type, channel
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""", params)
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templates = []
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for r in cur.fetchall():
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templates.append({
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'id': r[0], 'event_type': r[1], 'channel': r[2], 'name': r[3],
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'subject_template': r[4], 'body_template': r[5], 'is_active': r[6],
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})
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cur.close()
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return templates
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def create_template(conn, tenant_id, event_type, channel, name, body_template,
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subject_template=None, is_active=True):
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cur = conn.cursor()
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cur.execute("""
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INSERT INTO notification_templates
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(tenant_id, event_type, channel, name, subject_template, body_template, is_active)
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VALUES (%s, %s, %s, %s, %s, %s, %s)
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ON CONFLICT (tenant_id, event_type, channel) DO UPDATE SET
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name = EXCLUDED.name,
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subject_template = EXCLUDED.subject_template,
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body_template = EXCLUDED.body_template,
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is_active = EXCLUDED.is_active,
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updated_at = NOW()
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RETURNING id
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""", (tenant_id, event_type, channel, name, subject_template, body_template, is_active))
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tid = cur.fetchone()[0]
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conn.commit()
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cur.close()
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return tid
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def update_template(conn, template_id, data):
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cur = conn.cursor()
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allowed = ['event_type', 'channel', 'name', 'subject_template', 'body_template', 'is_active']
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sets = []
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vals = []
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for field in allowed:
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if field in data:
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sets.append(f"{field} = %s")
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vals.append(data[field])
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if not sets:
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cur.close()
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return False
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vals.append(template_id)
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cur.execute(f"UPDATE notification_templates SET {', '.join(sets)} WHERE id = %s", vals)
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conn.commit()
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cur.close()
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return True
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# ─── Event Dispatch ─────────────────────────────
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def dispatch_notification(conn, tenant_id, event_type, context, recipient_type='owner',
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recipient_id=None, channels=None):
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"""Dispatch a notification event to all configured channels.
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Args:
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conn: DB connection
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tenant_id: tenant ID
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event_type: e.g. 'low_stock', 'order_ready'
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context: dict with template variables
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recipient_type: 'owner', 'employee', 'customer', 'role'
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recipient_id: specific recipient ID
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channels: list of channels to use, or None for all active templates
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Returns:
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list of notification log IDs
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"""
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cur = conn.cursor()
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# Get active templates for this event
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if channels:
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placeholders = ','.join(['%s'] * len(channels))
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cur.execute(f"""
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SELECT id, channel, subject_template, body_template
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FROM notification_templates
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WHERE tenant_id = %s AND event_type = %s AND is_active = true
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AND channel IN ({placeholders})
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""", [tenant_id, event_type] + list(channels))
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else:
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cur.execute("""
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SELECT id, channel, subject_template, body_template
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FROM notification_templates
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WHERE tenant_id = %s AND event_type = %s AND is_active = true
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""", (tenant_id, event_type))
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templates = cur.fetchall()
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if not templates:
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cur.close()
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return []
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log_ids = []
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for tid, channel, subject_tmpl, body_tmpl in templates:
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subject = _render_template(subject_tmpl, context)
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body = _render_template(body_tmpl, context)
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# Insert log as pending
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cur.execute("""
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INSERT INTO notification_logs
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(tenant_id, recipient_type, recipient_id, event_type, channel,
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subject, body, status, metadata)
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VALUES (%s, %s, %s, %s, %s, %s, %s, 'pending', %s)
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RETURNING id
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""", (tenant_id, recipient_type, recipient_id, event_type, channel,
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subject, body, json.dumps(context) if isinstance(context, dict) else None))
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log_id = cur.fetchone()[0]
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log_ids.append(log_id)
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conn.commit()
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cur.close()
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# Send asynchronously (in production, this would go to a queue)
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for log_id in log_ids:
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_send_notification(conn, log_id)
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return log_ids
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def _send_notification(conn, log_id):
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"""Send a single notification by its log entry."""
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cur = conn.cursor()
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cur.execute("""
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SELECT channel, subject, body, recipient_type, recipient_id, metadata, tenant_id
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FROM notification_logs WHERE id = %s
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""", (log_id,))
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row = cur.fetchone()
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if not row:
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cur.close()
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return
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channel, subject, body, recipient_type, recipient_id, metadata, tenant_id = row
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try:
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if channel == 'push':
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_send_push(conn, tenant_id, recipient_type, recipient_id, subject, body, metadata)
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elif channel == 'whatsapp':
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_send_whatsapp(conn, tenant_id, recipient_type, recipient_id, body, metadata)
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elif channel == 'email':
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_send_email(conn, tenant_id, recipient_type, recipient_id, subject, body, metadata)
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elif channel == 'in_app':
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# In-app is just the log entry; UI polls notification_logs
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pass
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cur.execute("""
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UPDATE notification_logs SET status = 'sent', sent_at = NOW() WHERE id = %s
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""", (log_id,))
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conn.commit()
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except Exception as e:
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conn.rollback()
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cur2 = conn.cursor()
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try:
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cur2.execute("""
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UPDATE notification_logs SET status = 'failed', error_message = %s WHERE id = %s
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""", (str(e)[:500], log_id))
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conn.commit()
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except Exception:
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conn.rollback()
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finally:
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cur2.close()
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finally:
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cur.close()
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def _send_push(conn, tenant_id, recipient_type, recipient_id, title, body, metadata):
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"""Send Web Push notification."""
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try:
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from services.push_service import notify_owner
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# Try to find push subscriptions for recipient
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cur = conn.cursor()
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if recipient_type == 'owner':
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cur.execute("""
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SELECT s.subscription_json
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FROM push_subscriptions s
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JOIN employees e ON s.employee_id = e.id
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WHERE e.tenant_id = %s AND e.role = 'owner' AND s.is_active = true
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""", (tenant_id,))
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elif recipient_type == 'employee' and recipient_id:
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cur.execute("""
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SELECT subscription_json FROM push_subscriptions
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WHERE employee_id = %s AND is_active = true
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""", (recipient_id,))
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else:
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cur.close()
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return
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subs = [r[0] for r in cur.fetchall()]
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cur.close()
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if not subs:
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return
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# Send to all subscriptions
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for sub_json in subs:
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try:
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from services.push_service import send_push
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send_push(sub_json, title, body, metadata)
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except Exception:
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pass
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except ImportError:
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pass
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def _send_whatsapp(conn, tenant_id, recipient_type, recipient_id, body, metadata):
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"""Send WhatsApp notification via existing service."""
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try:
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from services.whatsapp_service import send_message
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cur = conn.cursor()
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phone = None
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if recipient_type == 'customer' and recipient_id:
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cur.execute("SELECT phone FROM customers WHERE id = %s", (recipient_id,))
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row = cur.fetchone()
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if row:
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phone = row[0]
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cur.close()
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if phone:
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send_message(phone, body)
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except Exception:
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pass
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def _send_email(conn, tenant_id, recipient_type, recipient_id, subject, body, metadata):
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"""Send email notification. Stub — requires SMTP config."""
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# Stub: would integrate with SMTP or SendGrid/Postmark
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pass
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# ─── Convenience Event Dispatchers ─────────────────────────────
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def notify_low_stock(conn, tenant_id, inventory_id, stock, reorder_point, branch_id=None):
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"""Notify when stock is below reorder point."""
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cur = conn.cursor()
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cur.execute("SELECT part_number, name FROM inventory WHERE id = %s", (inventory_id,))
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row = cur.fetchone()
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cur.close()
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if not row:
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return []
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return dispatch_notification(
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conn, tenant_id, 'low_stock',
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{
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'part_number': row[0], 'part_name': row[1],
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'stock': stock, 'reorder_point': reorder_point,
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'inventory_id': inventory_id,
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},
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recipient_type='owner',
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)
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def notify_order_ready(conn, tenant_id, service_order_id, customer_id):
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"""Notify customer when service order is ready."""
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cur = conn.cursor()
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cur.execute("""
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SELECT order_number, c.name, c.phone
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FROM service_orders so
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LEFT JOIN customers c ON so.customer_id = c.id
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WHERE so.id = %s
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""", (service_order_id,))
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row = cur.fetchone()
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cur.close()
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if not row:
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return []
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order_number, customer_name, phone = row
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# Push to owners
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push_ids = dispatch_notification(
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conn, tenant_id, 'order_ready',
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{'order_number': order_number, 'customer_name': customer_name or 'Cliente'},
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recipient_type='owner',
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)
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# WhatsApp to customer if phone exists
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if phone:
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wa_ids = dispatch_notification(
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conn, tenant_id, 'order_ready',
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{'order_number': order_number, 'customer_name': customer_name or 'Cliente'},
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recipient_type='customer', recipient_id=customer_id,
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channels=['whatsapp'],
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)
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return push_ids + wa_ids
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return push_ids
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def notify_maintenance_due(conn, tenant_id, vehicle_id, schedule_id):
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"""Notify when vehicle maintenance is due."""
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cur = conn.cursor()
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cur.execute("""
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SELECT v.plate, v.current_mileage, s.maintenance_type, s.next_due_km, s.next_due_at
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FROM fleet_vehicles v
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JOIN fleet_maintenance_schedules s ON s.vehicle_id = v.id
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WHERE v.id = %s AND s.id = %s
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""", (vehicle_id, schedule_id))
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row = cur.fetchone()
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cur.close()
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if not row:
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return []
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plate, mileage, mtype, next_km, next_at = row
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return dispatch_notification(
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conn, tenant_id, 'maintenance_due',
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{
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'vehicle_plate': plate, 'current_mileage': mileage or 0,
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'maintenance_type': mtype,
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'next_due_km': next_km or 'N/A',
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'next_due_date': str(next_at)[:10] if next_at else 'N/A',
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},
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recipient_type='owner',
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)
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def notify_new_sale(conn, tenant_id, sale_id, total, payment_method, employee_id=None):
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"""Notify owners of new sale."""
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return dispatch_notification(
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conn, tenant_id, 'new_sale',
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{
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'sale_id': sale_id, 'total': f"${float(total):,.2f}",
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'payment_method': payment_method or 'N/A',
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},
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recipient_type='owner',
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)
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def notify_po_received(conn, tenant_id, po_id, total):
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"""Notify when purchase order is received."""
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return dispatch_notification(
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conn, tenant_id, 'po_received',
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{'po_id': po_id, 'total': f"${float(total):,.2f}"},
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recipient_type='owner',
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)
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def get_notification_logs(conn, tenant_id, recipient_type=None, recipient_id=None,
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status=None, event_type=None, limit=50):
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cur = conn.cursor()
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where = ["tenant_id = %s"]
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params = [tenant_id]
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if recipient_type:
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where.append("recipient_type = %s")
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params.append(recipient_type)
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if recipient_id:
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where.append("recipient_id = %s")
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params.append(recipient_id)
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if status:
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where.append("status = %s")
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params.append(status)
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if event_type:
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where.append("event_type = %s")
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params.append(event_type)
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cur.execute(f"""
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SELECT id, event_type, channel, subject, body, status,
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sent_at, read_at, created_at
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FROM notification_logs
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WHERE {' AND '.join(where)}
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ORDER BY created_at DESC
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LIMIT %s
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""", params + [limit])
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logs = []
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for r in cur.fetchall():
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logs.append({
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'id': r[0], 'event_type': r[1], 'channel': r[2],
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'subject': r[3], 'body': r[4], 'status': r[5],
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'sent_at': str(r[6]) if r[6] else None,
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'read_at': str(r[7]) if r[7] else None,
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'created_at': str(r[8]),
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})
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cur.close()
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return logs
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def mark_as_read(conn, log_id):
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cur = conn.cursor()
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cur.execute("""
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UPDATE notification_logs SET status = 'read', read_at = NOW() WHERE id = %s
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""", (log_id,))
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conn.commit()
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cur.close()
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return True
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