Fix multiple issues

setup.py

@@ -11,7 +11,7 @@
     py_modules=["target_postgres"],
     install_requires=[
         "singer-python==5.1.1",
-        "psycopg2==2.7.5",
+        "psycopg2==2.8.4",
         "inflection==0.3.1"
     ],
     entry_points="""

target_postgres/__init__.py

@@ -13,13 +13,25 @@
 from tempfile import TemporaryFile
 
 import pkg_resources
-from jsonschema.validators import Draft4Validator
+from jsonschema import validators, 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']

target_postgres/db_sync.py

@@ -150,7 +150,7 @@ def record_to_csv_line(self, record):
         flatten = flatten_record(record)
         return ','.join(
             [
-                json.dumps(flatten[name]) if name in flatten and flatten[name] else ''
+                json.dumps(flatten[name], ensure_ascii=False) if name in flatten and (flatten[name] == 0 or flatten[name]) else ''
                 for name in self.flatten_schema
             ]
         )