Applying fixes for validation error from koszti [https://github.com/koszti/target-postgres/tree/fix/multipleOf-validation-error] (#2)

Author: robmoore

target_postgres/__init__.py

@@ -13,13 +13,25 @@
 from tempfile import NamedTemporaryFile
 
 import pkg_resources
-from jsonschema.validators import Draft4Validator
+from jsonschema import Draft4Validator, FormatChecker
+from decimal import Decimal
 import singer
 from target_postgres.db_sync import DbSync
 
 logger = singer.get_logger()
 
 
+def float_to_decimal(value):
+    '''Walk the given data structure and turn all instances of float into
+    double.'''
+    if isinstance(value, float):
+        return Decimal(str(value))
+    if isinstance(value, list):
+        return [float_to_decimal(child) for child in value]
+    if isinstance(value, dict):
+        return {k: float_to_decimal(v) for k, v in value.items()}
+    return value
+
 def emit_state(state):
     if state is not None:
         line = json.dumps(state)
@@ -65,7 +77,7 @@ def persist_lines(config, lines):
             stream = o['stream']
 
             # Validate record
-            validators[stream].validate(o['record'])
+            validators[stream].validate(float_to_decimal(o['record']))
 
             sync = stream_to_sync[stream]
 
@@ -93,7 +105,8 @@ def persist_lines(config, lines):
                 raise Exception("Line is missing required key 'stream': {}".format(line))
             stream = o['stream']
             schemas[stream] = o
-            validators[stream] = Draft4Validator(o['schema'])
+            schema = float_to_decimal(o['schema'])
+            validators[stream] = Draft4Validator(schema, format_checker=FormatChecker())
             if 'key_properties' not in o:
                 raise Exception("key_properties field is required")
             key_properties[stream] = o['key_properties']