roshanjrajan-zip opened a new pull request, #2824:
URL: https://github.com/apache/thrift/pull/2824
<!-- Explain the changes in the pull request below: -->
When serializing and deserializing Enums for Structs, we convert the Enum to
a string instead of keeping it as an Enum. What this means is that the thrift
file shows that an Enum is passed in the struct, when actually a string is
passed in. This is very confusing, breaks the thrift contract and can
arbitrarily lead to KeyError and such in the serialization/deserialization
logic.
Given a thrift file like the following:
```
enum TestEnum {
TestEnum0 = 0,
TestEnum1 = 1,
}
struct TestStruct {
1: optional string param1
2: optional TestEnum param2
}
```
this is how you would create a struct before and after the change.
```python
# Before
TestStruct(param1="test_string", param2=TestEnum.TestEnum1.name) # or pass
in "TestEnum1"
# After
TestStruct(param1="test_string", param2=TestEnum.TestEnum1)
```
Serialization/Deserialization Code Change Example-
```python
class TestStruct(object):
"""
Attributes:
- param1
- param2
"""
def __init__(self, param1=None, param2=None,):
self.param1 = param1
self.param2 = param2
def read(self, iprot):
if iprot._fast_decode is not None and isinstance(iprot.trans,
TTransport.CReadableTransport) and self.thrift_spec is not None:
iprot._fast_decode(self, iprot, [self.__class__,
self.thrift_spec])
return
iprot.readStructBegin()
while True:
(fname, ftype, fid) = iprot.readFieldBegin()
if ftype == TType.STOP:
break
if fid == 1:
if ftype == TType.STRING:
self.param1 = iprot.readString().decode('utf-8',
errors='replace') if sys.version_info[0] == 2 else iprot.readString()
else:
iprot.skip(ftype)
elif fid == 2:
if ftype == TType.I32:
-- self.param2 = TestEnum(iprot.readI32()).name
++ self.param2 = TestEnum(iprot.readI32())
else:
iprot.skip(ftype)
else:
iprot.skip(ftype)
iprot.readFieldEnd()
iprot.readStructEnd()
def write(self, oprot):
if oprot._fast_encode is not None and self.thrift_spec is not None:
oprot.trans.write(oprot._fast_encode(self, [self.__class__,
self.thrift_spec]))
return
oprot.writeStructBegin('TestStruct')
if self.param1 is not None:
oprot.writeFieldBegin('param1', TType.STRING, 1)
oprot.writeString(self.param1.encode('utf-8') if
sys.version_info[0] == 2 else self.param1)
oprot.writeFieldEnd()
if self.param2 is not None:
oprot.writeFieldBegin('param2', TType.I32, 2)
-- oprot.writeI32(TestEnum[self.param2].value)
++ oprot.writeI32(self.param2.value)
oprot.writeFieldEnd()
oprot.writeFieldStop()
oprot.writeStructEnd()
def validate(self):
return
def __repr__(self):
L = ['%s=%r' % (key, value)
for key, value in self.__dict__.items()]
return '%s(%s)' % (self.__class__.__name__, ', '.join(L))
def __eq__(self, other):
return isinstance(other, self.__class__) and self.__dict__ ==
other.__dict__
def __ne__(self, other):
return not (self == other)
all_structs.append(TestStruct)
TestStruct.thrift_spec = (
None, # 0
(1, TType.STRING, 'param1', 'UTF8', None, ), # 1
(2, TType.I32, 'param2', None, None, ), # 2
)
fix_spec(all_structs)
del all_structs
```
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