add

ccxt/async_support/base/ws/functions.py

@@ -0,0 +1,59 @@
+# -*- coding: utf-8 -*-
+
+from zlib import decompress, MAX_WBITS
+from base64 import b64decode
+from gzip import GzipFile
+from io import BytesIO
+import time
+import datetime
+
+
+def inflate(data):
+    return decompress(data, -MAX_WBITS)
+
+
+def inflate64(data):
+    return inflate(b64decode(data))
+
+
+def gunzip(data):
+    return GzipFile('', 'rb', 9, BytesIO(data)).read().decode('utf-8')
+
+
+#  Tmp : added methods below to avoid circular imports between exchange.py and aiohttp.py
+
+def milliseconds():
+    return int(time.time() * 1000)
+
+
+def iso8601(timestamp=None):
+    if timestamp is None:
+        return timestamp
+    if not isinstance(timestamp, int):
+        return None
+    if int(timestamp) < 0:
+        return None
+    try:
+        utc = datetime.datetime.fromtimestamp(timestamp // 1000, datetime.timezone.utc)
+        return utc.strftime('%Y-%m-%dT%H:%M:%S.%f')[:-6] + "{:03d}".format(int(timestamp) % 1000) + 'Z'
+    except (TypeError, OverflowError, OSError):
+        return None
+
+
+def is_json_encoded_object(input):
+    return (isinstance(input, str) and
+            (len(input) >= 2) and
+            ((input[0] == '{') or (input[0] == '[')))
+
+
+def deep_extend(*args):
+    result = None
+    for arg in args:
+        if isinstance(arg, dict):
+            if not isinstance(result, dict):
+                result = {}
+            for key in arg:
+                result[key] = deep_extend(result[key] if key in result else None, arg[key])
+        else:
+            result = arg
+    return result