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ThriftSerializationContext.py
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ThriftSerializationContext.py
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#
# A port of the Java ThriftSerializationContext, used for reading/writing
# DynamicSerialize objects to/from thrift.
#
# For serialization, it has no knowledge of the expected types in other
# languages, it is instead all based on inspecting the types of the objects
# passed to it. Therefore, ensure the types of python objects and primitives
# match what they should be in the destination language.
#
#
# SOFTWARE HISTORY
#
# Date Ticket# Engineer Description
# ------------ ---------- ----------- --------------------------
# 06/09/10 njensen Initial Creation.
# 06/12/13 #2099 dgilling Implement readObject() and
# writeObject().
# Apr 24, 2015 4425 nabowle Add Double support
# Oct 17, 2016 5919 njensen Optimized for speed
# Sep 06, 2018 mjames@ucar Python3 compliance
#
#
import inspect
import sys
import types
import six
import numpy
from thrift.Thrift import TType
import dynamicserialize
from dynamicserialize import dstypes, adapters
from dynamicserialize import SelfDescribingBinaryProtocol
DS_LEN = len('dynamicserialize.dstypes.')
dsObjTypes = {}
def buildObjMap(module):
if '__all__' in module.__dict__:
for i in module.__all__:
name = module.__name__ + '.' + i
__import__(name)
buildObjMap(sys.modules[name])
else:
clzName = module.__name__[module.__name__.rfind('.') + 1:]
clz = module.__dict__[clzName]
tname = module.__name__
tname = tname[DS_LEN:]
dsObjTypes[tname] = clz
buildObjMap(dstypes)
if six.PY2:
pythonToThriftMap = {
types.StringType: TType.STRING,
types.IntType: TType.I32,
types.LongType: TType.I64,
types.ListType: TType.LIST,
unicode: TType.STRING,
types.DictionaryType: TType.MAP,
type(set([])): TType.SET,
types.FloatType: SelfDescribingBinaryProtocol.FLOAT,
# types.FloatType: TType.DOUBLE,
types.BooleanType: TType.BOOL,
types.InstanceType: TType.STRUCT,
types.NoneType: TType.VOID,
numpy.float32: SelfDescribingBinaryProtocol.FLOAT,
numpy.int32: TType.I32,
numpy.ndarray: TType.LIST,
numpy.object_: TType.STRING, # making an assumption here
numpy.string_: TType.STRING,
numpy.float64: TType.DOUBLE,
numpy.int16: TType.I16,
numpy.int8: TType.BYTE,
numpy.int64: TType.I64
}
else:
pythonToThriftMap = {
bytes: TType.STRING,
int: TType.I32,
int: TType.I64,
list: TType.LIST,
dict: TType.MAP,
type(set([])): TType.SET,
float: SelfDescribingBinaryProtocol.FLOAT,
# types.FloatType: TType.DOUBLE,
bool: TType.BOOL,
object: TType.STRUCT,
str: TType.STRING,
type(None): TType.VOID,
numpy.float32: SelfDescribingBinaryProtocol.FLOAT,
numpy.int32: TType.I32,
numpy.ndarray: TType.LIST,
numpy.object_: TType.STRING, # making an assumption here
numpy.string_: TType.STRING,
numpy.float64: TType.DOUBLE,
numpy.int16: TType.I16,
numpy.int8: TType.BYTE,
numpy.int64: TType.I64
}
primitiveSupport = (TType.BYTE, TType.I16, TType.I32, TType.I64,
SelfDescribingBinaryProtocol.FLOAT, TType.DOUBLE)
class ThriftSerializationContext(object):
def __init__(self, serializationManager, selfDescribingBinaryProtocol):
self.serializationManager = serializationManager
self.protocol = selfDescribingBinaryProtocol
self.typeDeserializationMethod = {
TType.STRING: self.protocol.readString,
TType.I16: self.protocol.readI16,
TType.I32: self.protocol.readI32,
TType.LIST: self._deserializeArray,
TType.MAP: self._deserializeMap,
TType.SET: self._deserializeSet,
SelfDescribingBinaryProtocol.FLOAT: self.protocol.readFloat,
TType.BYTE: self.protocol.readByte,
TType.I64: self.protocol.readI64,
TType.DOUBLE: self.protocol.readDouble,
TType.BOOL: self.protocol.readBool,
TType.STRUCT: self.deserializeMessage,
TType.VOID: lambda: None
}
self.typeSerializationMethod = {
TType.STRING: self.protocol.writeString,
TType.I16: self.protocol.writeI16,
TType.I32: self.protocol.writeI32,
TType.LIST: self._serializeArray,
TType.MAP: self._serializeMap,
TType.SET: self._serializeSet,
SelfDescribingBinaryProtocol.FLOAT: self.protocol.writeFloat,
TType.BYTE: self.protocol.writeByte,
TType.I64: self.protocol.writeI64,
TType.DOUBLE: self.protocol.writeDouble,
TType.BOOL: self.protocol.writeBool,
TType.STRUCT: self.serializeMessage,
TType.VOID: lambda x: None
}
self.listDeserializationMethod = {
TType.BYTE: self.protocol.readI8List,
TType.I16: self.protocol.readI16List,
TType.I32: self.protocol.readI32List,
TType.I64: self.protocol.readI64List,
SelfDescribingBinaryProtocol.FLOAT: self.protocol.readF32List,
TType.DOUBLE: self.protocol.readF64List
}
self.listSerializationMethod = {
TType.BYTE: self.protocol.writeI8List,
TType.I16: self.protocol.writeI16List,
TType.I32: self.protocol.writeI32List,
TType.I64: self.protocol.writeI64List,
SelfDescribingBinaryProtocol.FLOAT: self.protocol.writeF32List,
TType.DOUBLE: self.protocol.writeF64List
}
def readMessageStart(self):
msg = self.protocol.readMessageBegin()
return msg[0]
def readMessageEnd(self):
self.protocol.readMessageEnd()
def deserializeMessage(self):
name = self.protocol.readStructBegin()
name = name.decode('cp437')
name = name.replace('_', '.')
if name.isdigit():
obj = self._deserializeType(int(name))
return obj
if name in adapters.classAdapterRegistry:
return adapters.classAdapterRegistry[name].deserialize(self)
elif '$' in name:
# it's an inner class, we're going to hope it's an enum, treat it
# special
fieldName, fieldType, fieldId = self.protocol.readFieldBegin()
if fieldName.decode('utf8') != '__enumValue__':
raise dynamicserialize.SerializationException(
"Expected to find enum payload. Found: " + fieldName)
obj = self.protocol.readString()
self.protocol.readFieldEnd()
return obj
else:
clz = dsObjTypes[name]
obj = clz()
while self._deserializeField(obj):
pass
self.protocol.readStructEnd()
return obj
def _deserializeType(self, b):
try:
return self.typeDeserializationMethod[b]()
except KeyError:
raise dynamicserialize.SerializationException(
"Unsupported type value " + str(b))
def _deserializeField(self, obj):
fieldName, fieldType, fieldId = self.protocol.readFieldBegin()
if fieldType == TType.STOP:
return False
elif fieldType != TType.VOID:
result = self._deserializeType(fieldType)
fn_str = bytes.decode(fieldName)
lookingFor = "set" + fn_str[0].upper() + fn_str[1:]
try:
setMethod = getattr(obj, lookingFor)
setMethod(result)
except ValueError:
raise dynamicserialize.SerializationException(
"Couldn't find setter method " + lookingFor)
self.protocol.readFieldEnd()
return True
def _deserializeArray(self):
listType, size = self.protocol.readListBegin()
result = []
if size:
if listType not in primitiveSupport:
m = self.typeDeserializationMethod[listType]
result = [m() for __ in range(size)]
else:
result = self.listDeserializationMethod[listType](size)
self.protocol.readListEnd()
return result
def _deserializeMap(self):
keyType, valueType, size = self.protocol.readMapBegin()
result = {}
for __ in range(size):
# can't go off the type, due to java generics limitations dynamic serialize is
# serializing keys and values as void
key = self.typeDeserializationMethod[TType.STRUCT]()
value = self.typeDeserializationMethod[TType.STRUCT]()
result[key] = value
self.protocol.readMapEnd()
return result
def _deserializeSet(self):
setType, setSize = self.protocol.readSetBegin()
result = set([])
for __ in range(setSize):
result.add(self.typeDeserializationMethod[TType.STRUCT]())
self.protocol.readSetEnd()
return result
def _lookupType(self, obj):
pyt = type(obj)
if pyt in pythonToThriftMap:
return pythonToThriftMap[pyt]
elif pyt.__module__[:DS_LEN - 1] == ('dynamicserialize.dstypes'):
if six.PY2:
return pythonToThriftMap[types.InstanceType]
return pythonToThriftMap[object]
raise dynamicserialize.SerializationException(
"Don't know how to serialize object of type: " + str(pyt))
def serializeMessage(self, obj):
tt = self._lookupType(obj)
if tt == TType.STRUCT:
fqn = obj.__module__[DS_LEN:]
if fqn in adapters.classAdapterRegistry:
# get proper class name when writing class name to serialization stream
# in case we have a special inner-class case
m = sys.modules[adapters.classAdapterRegistry[fqn].__name__]
if isinstance(m.ClassAdapter, list):
fqn = m.ClassAdapter[0]
self.protocol.writeStructBegin(fqn)
adapters.classAdapterRegistry[fqn].serialize(self, obj)
return
else:
self.protocol.writeStructBegin(fqn)
methods = inspect.getmembers(obj, inspect.ismethod)
fid = 1
for m in methods:
methodName = m[0]
if methodName.startswith('get'):
fieldname = methodName[3].lower() + methodName[4:]
val = m[1]()
ft = self._lookupType(val)
if ft == TType.STRUCT:
self._serializeField(fieldname, ft, fid, val)
else:
self._serializeField(fieldname, ft, fid, val)
fid += 1
self.protocol.writeFieldStop()
self.protocol.writeStructEnd()
else:
# basic types
self.protocol.writeStructBegin(str(tt))
self._serializeType(obj, tt)
self.protocol.writeStructEnd()
def _serializeField(self, fieldName, fieldType, fieldId, fieldValue):
self.protocol.writeFieldBegin(fieldName, fieldType, fieldId)
self._serializeType(fieldValue, fieldType)
self.protocol.writeFieldEnd()
def _serializeType(self, fieldValue, fieldType):
if fieldType in self.typeSerializationMethod:
return self.typeSerializationMethod[fieldType](fieldValue)
else:
raise dynamicserialize.SerializationException(
"Unsupported type value " + str(fieldType))
def _serializeArray(self, obj):
size = len(obj)
if size:
if isinstance(obj, numpy.ndarray):
t = pythonToThriftMap[obj.dtype.type]
size = obj.size
else:
t = self._lookupType(obj[0])
else:
t = TType.STRUCT
self.protocol.writeListBegin(t, size)
if t == TType.STRING:
if isinstance(obj, numpy.ndarray):
if len(obj.shape) == 1:
for x in obj:
s = str(x).strip()
self.typeSerializationMethod[t](s)
else:
for x in obj:
for y in x:
s = str(y).strip()
self.typeSerializationMethod[t](s)
else:
for x in obj:
s = str(x)
self.typeSerializationMethod[t](s)
elif t not in primitiveSupport:
for x in obj:
self.typeSerializationMethod[t](x)
else:
self.listSerializationMethod[t](obj)
self.protocol.writeListEnd()
def _serializeMap(self, obj):
size = len(obj)
self.protocol.writeMapBegin(TType.VOID, TType.VOID, size)
for k in list(obj.keys()):
self.typeSerializationMethod[TType.STRUCT](k)
self.typeSerializationMethod[TType.STRUCT](obj[k])
self.protocol.writeMapEnd()
def _serializeSet(self, obj):
size = len(obj)
self.protocol.writeSetBegin(TType.VOID, size)
for x in obj:
self.typeSerializationMethod[TType.STRUCT](x)
self.protocol.writeSetEnd()
def writeMessageStart(self, name):
self.protocol.writeMessageBegin(name, TType.VOID, 0)
def writeMessageEnd(self):
self.protocol.writeMessageEnd()
def readBool(self):
return self.protocol.readBool()
def writeBool(self, b):
self.protocol.writeBool(b)
def readByte(self):
return self.protocol.readByte()
def writeByte(self, b):
self.protocol.writeByte(b)
def readDouble(self):
return self.protocol.readDouble()
def writeDouble(self, d):
self.protocol.writeDouble(d)
def readFloat(self):
return self.protocol.readFloat()
def writeFloat(self, f):
self.protocol.writeFloat(f)
def readI16(self):
return self.protocol.readI16()
def writeI16(self, i):
self.protocol.writeI16(i)
def readI32(self):
return self.protocol.readI32()
def writeI32(self, i):
self.protocol.writeI32(i)
def readI64(self):
return self.protocol.readI64()
def writeI64(self, i):
self.protocol.writeI64(i)
def readString(self):
return self.protocol.readString()
def writeString(self, s):
self.protocol.writeString(s)
def readBinary(self):
numBytes = self.protocol.readI32()
return self.protocol.readI8List(numBytes)
def readFloatArray(self):
size = self.protocol.readI32()
return self.protocol.readF32List(size)
def writeFloatArray(self, floats):
self.protocol.writeI32(len(floats))
self.protocol.writeF32List(floats)
def readObject(self):
return self.deserializeMessage()
def writeObject(self, obj):
self.serializeMessage(obj)