Merge branch 'stable-2.6' into devel-2.6

[ganeti-local] / lib / serializer.py

diff --git a/lib/serializer.py b/lib/serializer.py
index 5b80675..cbc11fa 100644 (file)
--- a/lib/serializer.py
+++ b/lib/serializer.py
@@ -29,62 +29,32 @@ backend (currently json).
 # C0103: Invalid name, since pylint doesn't see that Dump points to a
 # function and not a constant
 
-try:
-  import json
-except ImportError:
-  # The "json" module was only added in Python 2.6. Earlier versions must use
-  # the separate "simplejson" module.
-  import simplejson as json
-
 import re
 
+# Python 2.6 and above contain a JSON module based on simplejson. Unfortunately
+# the standard library version is significantly slower than the external
+# module. While it should be better from at least Python 3.2 on (see Python
+# issue 7451), for now Ganeti needs to work well with older Python versions
+# too.
+import simplejson
+
 from ganeti import errors
 from ganeti import utils
 
 
-_JSON_INDENT = 2
-
 _RE_EOLSP = re.compile("[ \t]+$", re.MULTILINE)
 
 
-def _GetJsonDumpers(_encoder_class=json.JSONEncoder):
-  """Returns two JSON functions to serialize data.
-
-  @rtype: (callable, callable)
-  @return: The function to generate a compact form of JSON and another one to
-           generate a more readable, indented form of JSON (if supported)
-
-  """
-  plain_encoder = _encoder_class(sort_keys=True)
-
-  # Check whether the simplejson module supports indentation
-  try:
-    indent_encoder = _encoder_class(indent=_JSON_INDENT, sort_keys=True)
-  except TypeError:
-    # Indentation not supported
-    indent_encoder = plain_encoder
-
-  return (plain_encoder.encode, indent_encoder.encode)
-
-
-(_DumpJson, _DumpJsonIndent) = _GetJsonDumpers()
-
-
-def DumpJson(data, indent=True):
+def DumpJson(data):
   """Serialize a given object.
 
   @param data: the data to serialize
-  @param indent: whether to indent output (depends on simplejson version)
-
   @return: the string representation of data
 
   """
-  if indent:
-    fn = _DumpJsonIndent
-  else:
-    fn = _DumpJson
+  encoded = simplejson.dumps(data)
 
-  txt = _RE_EOLSP.sub("", fn(data))
+  txt = _RE_EOLSP.sub("", encoded)
   if not txt.endswith("\n"):
     txt += "\n"
 
@@ -99,7 +69,7 @@ def LoadJson(txt):
   @return: the original data
 
   """
-  return json.loads(txt)
+  return simplejson.loads(txt)
 
 
 def DumpSignedJson(data, key, salt=None, key_selector=None):
@@ -112,7 +82,7 @@ def DumpSignedJson(data, key, salt=None, key_selector=None):
   @return: the string representation of data signed by the hmac key
 
   """
-  txt = DumpJson(data, indent=False)
+  txt = DumpJson(data)
   if salt is None:
     salt = ""
   signed_dict = {
@@ -127,7 +97,7 @@ def DumpSignedJson(data, key, salt=None, key_selector=None):
 
   signed_dict["hmac"] = utils.Sha1Hmac(key, txt, salt=salt + key_selector)
 
-  return DumpJson(signed_dict, indent=False)
+  return DumpJson(signed_dict)
 
 
 def LoadSignedJson(txt, key):