Add initial Rattail -> CORE-POS export logic

only allows "update" for Vendor model so far.  more to come after testing...

rattail_corepos/datasync/corepos.py

@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2018 Lance Edgar
+#  Copyright © 2010-2020 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -27,7 +27,7 @@ DataSync for CORE POS
 from corepos.db.office_op import Session as CoreSession, model as corepos
 
 from rattail.db import model
-from rattail.datasync import DataSyncWatcher
+from rattail.datasync import DataSyncWatcher, NewDataSyncImportConsumer
 
 
 class CoreOfficeOpWatcher(DataSyncWatcher):
@@ -130,3 +130,66 @@ class COREPOSProductWatcher(DataSyncWatcher):
 
         session.close()
         return changes
+
+
+class FromRattailToCore(NewDataSyncImportConsumer):
+    """
+    Rattail -> CORE POS datasync consumer
+    """
+    handler_spec = 'rattail_corepos.corepos.importing.rattail:FromRattailToCore'
+
+    def begin_transaction(self):
+        self.corepos_session = CoreSession()
+
+    def rollback_transaction(self):
+        self.corepos_session.rollback()
+        self.corepos_session.close()
+
+    def commit_transaction(self):
+        self.corepos_session.commit()
+        self.corepos_session.close()
+
+    def process_changes(self, session, changes):
+        """
+        Process all the given changes, coming from Rattail.
+        """
+        # TODO: this probably doesn't accomplish anything here?
+        if self.runas_username:
+            session.set_continuum_user(self.runas_username)
+
+        # update all importers with current Rattail/CORE sessions
+        for importer in self.importers.values():
+            importer.host_session = session
+            importer.session = self.corepos_session
+            # also establish the API client for each!
+            importer.establish_api()
+
+        # next pass syncs all Vendor changes
+        types = [
+            'Vendor',
+            'VendorPhoneNumber',
+            'VendorEmailAddress',
+        ]
+        for change in [c for c in changes if c.payload_type in types]:
+            vendor = self.get_host_vendor(session, change)
+            if vendor:
+                # TODO: what about "deletions" - not sure what happens yet
+                self.process_change(session, self.importers['Vendor'],
+                                    host_object=vendor)
+                # self.process_change(session, self.importers['VendorContact'],
+                #                     host_object=vendor)
+
+    def get_host_vendor(self, session, change):
+
+        if change.payload_type == 'Vendor':
+            return session.query(model.Vendor).get(change.payload_key)
+
+        if change.payload_type == 'VendorPhoneNumber':
+            phone = session.query(model.VendorPhoneNumber).get(change.payload_key)
+            if phone:
+                return phone.vendor
+
+        if change.payload_type == 'VendorEmailAddress':
+            email = session.query(model.VendorEmailAddress).get(change.payload_key)
+            if email:
+                return email.vendor