WIP server sql backend adapter handle duplicates

chainqueue/adapters/eth.py

@@ -16,5 +16,6 @@ class EthAdapter:
     def add(self, chain_spec, bytecode):
         tx = unpack(bytecode, chain_spec)
         session = self.backend.create_session()
-        self.backend.create(chain_spec, tx['nonce'], tx['from'], tx['hash'], add_0x(bytecode.hex()), session=session)
+        r = self.backend.create(chain_spec, tx['nonce'], tx['from'], tx['hash'], add_0x(bytecode.hex()), session=session)
         session.close()
+        return r

chainqueue/error.py

@@ -27,4 +27,3 @@ class BackendIntegrityError(ChainQueueException):
     """
     pass
 
-

chainqueue/runnable/server.py

@@ -124,6 +124,7 @@ if __name__ == '__main__':
         data_in = srvs.recv(1024)
         data_in_str = data_in.decode('utf-8')
         data = bytes.fromhex(strip_0x(data_in_str))
-        adapter.add(chain_spec, data)
+        r = adapter.add(chain_spec, data)
+        srvs.send(r.to_bytes(4, byteorder='big'))
 
     ctrl.shutdown(None, None)

chainqueue/sql/backend.py

@@ -1,13 +1,31 @@
+# standard imports
+import logging
+
+# external imports
+from sqlalchemy.exc import (
+    IntegrityError,
+    )
+
 # local imports
-from chainqueue.sql.tx import create
+from chainqueue.sql.tx import create as queue_create
 from chainqueue.db.models.base import SessionBase
 
+logg = logging.getLogger(__name__)
+
 
 class SQLBackend:
 
     def __init__(self, conn_spec, *args, **kwargs):
         SessionBase.connect(conn_spec, pool_size=kwargs.get('poolsize', 0), debug=kwargs.get('debug', False))
-        self.create = create
+
+
+    def create(self, chain_spec, nonce, holder_address, tx_hash, signed_tx, obsolete_predecessors=True, session=None):
+        try:
+            queue_create(chain_spec, nonce, holder_address, tx_hash, signed_tx, obsolete_predecessors=True, session=None)
+        except IntegrityError as e:
+            logg.warning('skipped possible duplicate insert {}'.format(e))
+            return 1
+        return 0
 
 
     def create_session(self):