fixing invalid token problems

Token where the smartcontract was destroyed have invalid balance
  breaking dbt tranformation.

Signed-off-by: Alexis Pentori <alexis@status.im>

source_wallet_fetcher/schemas/token.json

@@ -35,13 +35,13 @@
     "balance": {
       "type": [
         "null",
-        "numeric"
+        "number"
       ]
     },
     "decimal": {
       "type": [
         "null",
-        "integer"
+        "number"
       ]
     }
   }

source_wallet_fetcher/source.py

@@ -55,7 +55,10 @@ class Token(HttpStream):
         logging.info("Fetching Tokens balance information")
         tokens_data=response.json()['tokens']
         for t in tokens_data:
-           yield extract_token(t) 
+            try:
+                yield extract_token(t)
+            except Exception as e:
+                logger.error('Dropping token not valid %s' % t )
 # Source
 class SourceWalletFetcher(AbstractSource):
     def check_connection(self, logger, config) -> Tuple[bool, any]:

source_wallet_fetcher/utils.py

@@ -3,22 +3,22 @@ import json
 
 
 def extract_token(token_data):
-    name= 'No Name' if 'name' not in token_data['tokenInfo'] else token_data['tokenInfo']['name']
     description= 'No description available' if 'description' not in token_data['tokenInfo'] else token_data['tokenInfo']['description']
     symbol= 'No Symbol' if 'symbol' not in token_data['tokenInfo'] else token_data['tokenInfo']['symbol']
     try:
+        if token_data['tokenInfo']['decimals'] == '22270923681254677845691103109158760375340177724800803888364822332811285364736':
+            # The data is not valid, droping it.
+            raise Exception('Not a valid token')
         token = {
-            "name": name,
+            "name": token_data['tokenInfo']['name'],
             "symbol": symbol,
             "description": description,
             "address":token_data['tokenInfo']['address'],
             "chain": "Ethereum",
-            "balance": token_data['rawBalance'],
+            "balance": token_data['balance'],
             "decimal": token_data['tokenInfo']['decimals']
         }
         return token
     except KeyError:
-        logging.error("Error when trying to extract data from token %s"  % tokens_data)
-        return None
-
+        raise Exception('Not a  valid token')