1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
"""Serializer/Deserializer objects for usage with SQLAlchemy structures.
Any SQLAlchemy structure, including Tables, Columns, expressions, mappers,
Query objects etc. can be serialized in a minimally-sized format,
and deserialized when given a Metadata and optional ScopedSession object
to use as context on the way out.
Usage is nearly the same as that of the standard Python pickle module::
from sqlalchemy.ext.serializer import loads, dumps
metadata = MetaData(bind=some_engine)
Session = scoped_session(sessionmaker())
# ... define mappers
query = Session.query(MyClass).filter(MyClass.somedata=='foo').order_by(MyClass.sortkey)
# pickle the query
serialized = dumps(query)
# unpickle. Pass in metadata + scoped_session
query2 = loads(serialized, metadata, Session)
print query2.all()
Similar restrictions as when using raw pickle apply; mapped classes must be
themselves be pickleable, meaning they are importable from a module-level
namespace.
Note that instances of user-defined classes do not require this extension
in order to be pickled; these contain no references to engines, sessions
or expression constructs in the typical case and can be serialized directly.
This module is specifically for ORM and expression constructs.
"""
from sqlalchemy.orm import class_mapper, Query
from sqlalchemy.orm.session import Session
from sqlalchemy.orm.mapper import Mapper
from sqlalchemy.orm.attributes import QueryableAttribute
from sqlalchemy import Table, Column
from sqlalchemy.engine import Engine
from sqlalchemy.util import pickle
import re
import base64
# Py3K
#from io import BytesIO as byte_buffer
# Py2K
from cStringIO import StringIO as byte_buffer
# end Py2K
# Py3K
#def b64encode(x):
# return base64.b64encode(x).decode('ascii')
#def b64decode(x):
# return base64.b64decode(x.encode('ascii'))
# Py2K
b64encode = base64.b64encode
b64decode = base64.b64decode
# end Py2K
__all__ = ['Serializer', 'Deserializer', 'dumps', 'loads']
def Serializer(*args, **kw):
pickler = pickle.Pickler(*args, **kw)
def persistent_id(obj):
#print "serializing:", repr(obj)
if isinstance(obj, QueryableAttribute):
cls = obj.impl.class_
key = obj.impl.key
id = "attribute:" + key + ":" + b64encode(pickle.dumps(cls))
elif isinstance(obj, Mapper) and not obj.non_primary:
id = "mapper:" + b64encode(pickle.dumps(obj.class_))
elif isinstance(obj, Table):
id = "table:" + str(obj)
elif isinstance(obj, Column) and isinstance(obj.table, Table):
id = "column:" + str(obj.table) + ":" + obj.key
elif isinstance(obj, Session):
id = "session:"
elif isinstance(obj, Engine):
id = "engine:"
else:
return None
return id
pickler.persistent_id = persistent_id
return pickler
our_ids = re.compile(r'(mapper|table|column|session|attribute|engine):(.*)')
def Deserializer(file, metadata=None, scoped_session=None, engine=None):
unpickler = pickle.Unpickler(file)
def get_engine():
if engine:
return engine
elif scoped_session and scoped_session().bind:
return scoped_session().bind
elif metadata and metadata.bind:
return metadata.bind
else:
return None
def persistent_load(id):
m = our_ids.match(id)
if not m:
return None
else:
type_, args = m.group(1, 2)
if type_ == 'attribute':
key, clsarg = args.split(":")
cls = pickle.loads(b64decode(clsarg))
return getattr(cls, key)
elif type_ == "mapper":
cls = pickle.loads(b64decode(args))
return class_mapper(cls)
elif type_ == "table":
return metadata.tables[args]
elif type_ == "column":
table, colname = args.split(':')
return metadata.tables[table].c[colname]
elif type_ == "session":
return scoped_session()
elif type_ == "engine":
return get_engine()
else:
raise Exception("Unknown token: %s" % type_)
unpickler.persistent_load = persistent_load
return unpickler
def dumps(obj):
buf = byte_buffer()
pickler = Serializer(buf)
pickler.dump(obj)
return buf.getvalue()
def loads(data, metadata=None, scoped_session=None, engine=None):
buf = byte_buffer(data)
unpickler = Deserializer(buf, metadata, scoped_session, engine)
return unpickler.load()
|
