[ADD] Parse the request and response to ease debug

1. Also the requests are stored and enable to trace posible errors
2. When the invoice is not received with success there is no error, store the problems in ws.request.errors and enable the user to retry later.

models/ws.py

+# -*- coding: utf-8 -*-
+from openerp import models, fields, api, exceptions, _
+from lxml import etree
+import re
+from suds.client import Client
+import logging
+
+_logger = logging.getLogger(__name__)
+
+
+class ws_request(models.Model):
+    _name = 'ws.request'
+    _description = 'WS Request'
+
+    date = fields.Datetime(default=fields.Datetime.now)
+    invoice_id = fields.Many2one('account.invoice')
+    xml_req = fields.Text('XML Request')
+    xml_res = fields.Text('XML Response')
+    detail_ids = fields.One2many('ws.request.detail', 'req_id')
+    errors_ids = fields.One2many('ws.request.error', 'req_id')
+    success = fields.Boolean()
+
+    @api.multi
+    def send(self):
+        self.ensure_one()
+        conf_obj = self.env['ir.config_parameter'].sudo()
+        ws_url = (conf_obj.get_param('financing.ws.url') or 'http://servicioscpz.credipaz.com/wsMIL/wsMIL.asmx') + '?WSDL'
+        ws_user = conf_obj.sudo().get_param('financing.ws.user')
+        ws_pass = conf_obj.sudo().get_param('financing.ws.pass')
+        ws_pin = conf_obj.sudo().get_param('financing.ws.pin')
+        ws_client = Client(ws_url)
+        try:
+            self.xml_res = ws_client.service.RegistrarVentaMil(sUsuario=ws_user, sPassword=ws_pass, sPin=ws_pin, xmlVenta=self.xml_req)
+        except Exception as e:
+            self.write({
+                'errors_ids': [(0, 0, {'name': _('Connection Error'), 'desc': e})]
+            })
+            _logger.warning('Unable to send data to credipaz')
+            _logger.warning('<<<DATA SENT TO CREDIPAZ>>>\n%s' % ws_client.last_sent())
+            _logger.warning('<<<DATA RECEIVED FROM CREDIPAZ>>>\n%s' % ws_client.last_received())
+            retcode = 1
+        else:
+            retcode = self.parse_response()
+        return retcode
+
+    @api.multi
+    def parse_response(self):
+        self.ensure_one()
+        root = etree.fromstring(self.xml_res.encode('utf-8'))
+        err_lst = []
+        for err_obj in root.findall('./ERRORES/ERROR'):
+            match_obj = re.match(r'^(\w*):\s?(.*)', err_obj.text)
+            if match_obj:
+                name = match_obj.group(1)
+                desc = match_obj.group(2)
+            else:
+                name = '_'
+                desc = err_obj.text
+            err_lst.append({'name': name, 'desc': desc})
+        if not err_lst:
+            self.success = True
+            return 0
+        else:
+            self.write({
+                'errors_ids': [(0, 0, v) for v in err_lst]
+            })
+            return 1
+        return 0
+
+    def create(self, vals):
+        xml_as_str = vals['xml_req']
+        root = etree.fromstring(xml_as_str)
+        det_vals = []
+        # Catch element that do not require iteration
+        non_it_elements = [
+            './/Fecha/*',
+            './/Hora/*',
+            './/Lugar/Sucursal',
+            './/Lugar/Operador',
+            './/Lugar/Terminal',
+            './/Venta/TipoOperacion',
+            './/Venta/DocumentoComprador',
+            './/Venta/IdVenta',
+            './/Venta/FormaPago',
+            './/Venta/PrecioVenta',
+            './/Venta/DescuentoAplicado',
+            './/Venta/AgenteVentas',
+            './/Comprador/Nombre',
+            './/Comprador/TipoDoc',
+            './/Comprador/Documento',
+        ]
+        for el_path in non_it_elements:
+            el_obj = root.find(el_path)
+            det_vals.append({'name': el_obj.tag, 'content': el_obj.text})
+        # Iterate on productos
+        for pos, el_obj in enumerate(root.findall('.//Productos/Producto')):
+            for sub_el_obj in el_obj.findall('./'):
+                prod_tag_name = 'Prod(%s): %s' % (pos, sub_el_obj.tag)
+                det_vals.append({'name': prod_tag_name, 'content': sub_el_obj.text})
+        # Iterate on productos
+        for pos, el_obj in enumerate(root.findall('.//FormasDePago/FormaDePago')):
+            for sub_el_obj in el_obj.findall('./'):
+                pago_tag_name = 'Pago(%s): %s' % (pos, sub_el_obj.tag)
+                det_vals.append({'name': pago_tag_name, 'content': sub_el_obj.text})
+
+        vals['detail_ids'] = [(0, 0, v) for v in det_vals]
+        res = super(ws_request, self).create(vals)
+        return res
+
+
+class ws_request_detail(models.Model):
+    _name = 'ws.request.detail'
+    _description = 'Details of WS Request'
+
+    req_id = fields.Many2one('ws.request', required=True)
+    name = fields.Char('Field')
+    content = fields.Char('Content')
+
+
+class ws_request_error(models.Model):
+    _name = 'ws.request.error'
+    _description = 'Error of WS Request'
+
+    req_id = fields.Many2one('ws.request')
+    name = fields.Char('Field')
+    desc = fields.Char('Description')