Implement rpc dialect arg setting

chainlib/cli/arg.py

@@ -137,6 +137,7 @@ class ArgumentParser(argparse.ArgumentParser):
             self.add_argument('--env-prefix', default=env.get('CONFINI_ENV_PREFIX'), dest='env_prefix', type=str, help='environment prefix for variables to overwrite configuration')
         if arg_flags & Flag.PROVIDER:
             self.add_argument('-p', '--provider', dest='p', type=str, help='RPC HTTP(S) provider url')
+            self.add_argument('--rpc-dialect', dest='rpc_dialect', type=str, help='RPC HTTP(S) backend dialect')
             self.add_argument('--height', default='latest', help='Block height to execute against')
         if arg_flags & Flag.CHAIN_SPEC:
             self.add_argument('-i', '--chain-spec', dest='i', type=str, help='Chain specification string')

chainlib/cli/config.py

@@ -159,6 +159,7 @@ class Config(confini.Config):
 
         if arg_flags & Flag.PROVIDER:
             args_override['RPC_HTTP_PROVIDER'] = getattr(args, 'p')
+            args_override['RPC_DIALECT'] = getattr(args, 'rpc_dialect')
         if arg_flags & Flag.CHAIN_SPEC:
             args_override['CHAIN_SPEC'] = getattr(args, 'i')
         if arg_flags & Flag.KEY_FILE:

chainlib/cli/rpc.py

@@ -29,6 +29,7 @@ class Rpc:
         self.wallet = wallet
         self.nonce_oracle = None
         self.fee_oracle = None
+        self.error_parser = None
 
 
     def connect_by_config(self, config):

chainlib/data/config/config.ini

@@ -3,6 +3,7 @@ http_provider =
 http_authentication = 
 http_username =
 http_password =
+dialect = default
 
 [chain]
 spec = 

chainlib/error.py

@@ -20,3 +20,25 @@ class ExecutionError(Exception):
 class SignerMissingException(Exception):
     """Raised when attempting to retrieve a signer when none has been added
     """
+
+
+class RPCNonceException(RPCException):
+    """RPC error for invalid nonce in transaction
+    """
+
+
+class DefaultErrorParser:
+    """Base class for parsing RPC error repsonses
+    """
+
+    def translate(self, error):
+        """Interface method called by unspeficied rpc when encountering an error
+
+        This class method should be overriden to provide more fine-grained context for both general and implementation specific errors.
+
+        :param error: RPC error response object
+        :type error: dict
+        :rtype: chainlib.error.JSONRPCException
+        :returns: Descriptiv JSONRPCException 
+        """
+        return RPCException('default parser code {}'.format(error))