|
|
|
|
@@ -0,0 +1,271 @@
|
|
|
|
|
Metadata-Version: 2.1
|
|
|
|
|
Name: msgpack
|
|
|
|
|
Version: 1.1.0
|
|
|
|
|
Summary: MessagePack serializer
|
|
|
|
|
Author-email: Inada Naoki <songofacandy@gmail.com>
|
|
|
|
|
License: Apache 2.0
|
|
|
|
|
Project-URL: Homepage, https://msgpack.org/
|
|
|
|
|
Project-URL: Documentation, https://msgpack-python.readthedocs.io/
|
|
|
|
|
Project-URL: Repository, https://github.com/msgpack/msgpack-python/
|
|
|
|
|
Project-URL: Tracker, https://github.com/msgpack/msgpack-python/issues
|
|
|
|
|
Project-URL: Changelog, https://github.com/msgpack/msgpack-python/blob/main/ChangeLog.rst
|
|
|
|
|
Keywords: msgpack,messagepack,serializer,serialization,binary
|
|
|
|
|
Classifier: Development Status :: 5 - Production/Stable
|
|
|
|
|
Classifier: Operating System :: OS Independent
|
|
|
|
|
Classifier: Programming Language :: Python
|
|
|
|
|
Classifier: Programming Language :: Python :: 3
|
|
|
|
|
Classifier: Programming Language :: Python :: 3.8
|
|
|
|
|
Classifier: Programming Language :: Python :: 3.9
|
|
|
|
|
Classifier: Programming Language :: Python :: 3.10
|
|
|
|
|
Classifier: Programming Language :: Python :: 3.11
|
|
|
|
|
Classifier: Programming Language :: Python :: 3.12
|
|
|
|
|
Classifier: Programming Language :: Python :: Implementation :: CPython
|
|
|
|
|
Classifier: Programming Language :: Python :: Implementation :: PyPy
|
|
|
|
|
Classifier: Intended Audience :: Developers
|
|
|
|
|
Classifier: License :: OSI Approved :: Apache Software License
|
|
|
|
|
Requires-Python: >=3.8
|
|
|
|
|
Description-Content-Type: text/markdown
|
|
|
|
|
License-File: COPYING
|
|
|
|
|
|
|
|
|
|
# MessagePack for Python
|
|
|
|
|
|
|
|
|
|
[](https://github.com/msgpack/msgpack-python/actions/workflows/wheel.yml)
|
|
|
|
|
[](https://msgpack-python.readthedocs.io/en/latest/?badge=latest)
|
|
|
|
|
|
|
|
|
|
## What's this
|
|
|
|
|
|
|
|
|
|
[MessagePack](https://msgpack.org/) is an efficient binary serialization format.
|
|
|
|
|
It lets you exchange data among multiple languages like JSON.
|
|
|
|
|
But it's faster and smaller.
|
|
|
|
|
This package provides CPython bindings for reading and writing MessagePack data.
|
|
|
|
|
|
|
|
|
|
## Install
|
|
|
|
|
|
|
|
|
|
```
|
|
|
|
|
$ pip install msgpack
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
### Pure Python implementation
|
|
|
|
|
|
|
|
|
|
The extension module in msgpack (`msgpack._cmsgpack`) does not support PyPy.
|
|
|
|
|
|
|
|
|
|
But msgpack provides a pure Python implementation (`msgpack.fallback`) for PyPy.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Windows
|
|
|
|
|
|
|
|
|
|
When you can't use a binary distribution, you need to install Visual Studio
|
|
|
|
|
or Windows SDK on Windows.
|
|
|
|
|
Without extension, using pure Python implementation on CPython runs slowly.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## How to use
|
|
|
|
|
|
|
|
|
|
### One-shot pack & unpack
|
|
|
|
|
|
|
|
|
|
Use `packb` for packing and `unpackb` for unpacking.
|
|
|
|
|
msgpack provides `dumps` and `loads` as an alias for compatibility with
|
|
|
|
|
`json` and `pickle`.
|
|
|
|
|
|
|
|
|
|
`pack` and `dump` packs to a file-like object.
|
|
|
|
|
`unpack` and `load` unpacks from a file-like object.
|
|
|
|
|
|
|
|
|
|
```pycon
|
|
|
|
|
>>> import msgpack
|
|
|
|
|
>>> msgpack.packb([1, 2, 3])
|
|
|
|
|
'\x93\x01\x02\x03'
|
|
|
|
|
>>> msgpack.unpackb(_)
|
|
|
|
|
[1, 2, 3]
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
Read the docstring for options.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Streaming unpacking
|
|
|
|
|
|
|
|
|
|
`Unpacker` is a "streaming unpacker". It unpacks multiple objects from one
|
|
|
|
|
stream (or from bytes provided through its `feed` method).
|
|
|
|
|
|
|
|
|
|
```py
|
|
|
|
|
import msgpack
|
|
|
|
|
from io import BytesIO
|
|
|
|
|
|
|
|
|
|
buf = BytesIO()
|
|
|
|
|
for i in range(100):
|
|
|
|
|
buf.write(msgpack.packb(i))
|
|
|
|
|
|
|
|
|
|
buf.seek(0)
|
|
|
|
|
|
|
|
|
|
unpacker = msgpack.Unpacker(buf)
|
|
|
|
|
for unpacked in unpacker:
|
|
|
|
|
print(unpacked)
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Packing/unpacking of custom data type
|
|
|
|
|
|
|
|
|
|
It is also possible to pack/unpack custom data types. Here is an example for
|
|
|
|
|
`datetime.datetime`.
|
|
|
|
|
|
|
|
|
|
```py
|
|
|
|
|
import datetime
|
|
|
|
|
import msgpack
|
|
|
|
|
|
|
|
|
|
useful_dict = {
|
|
|
|
|
"id": 1,
|
|
|
|
|
"created": datetime.datetime.now(),
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
def decode_datetime(obj):
|
|
|
|
|
if '__datetime__' in obj:
|
|
|
|
|
obj = datetime.datetime.strptime(obj["as_str"], "%Y%m%dT%H:%M:%S.%f")
|
|
|
|
|
return obj
|
|
|
|
|
|
|
|
|
|
def encode_datetime(obj):
|
|
|
|
|
if isinstance(obj, datetime.datetime):
|
|
|
|
|
return {'__datetime__': True, 'as_str': obj.strftime("%Y%m%dT%H:%M:%S.%f")}
|
|
|
|
|
return obj
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
packed_dict = msgpack.packb(useful_dict, default=encode_datetime)
|
|
|
|
|
this_dict_again = msgpack.unpackb(packed_dict, object_hook=decode_datetime)
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
`Unpacker`'s `object_hook` callback receives a dict; the
|
|
|
|
|
`object_pairs_hook` callback may instead be used to receive a list of
|
|
|
|
|
key-value pairs.
|
|
|
|
|
|
|
|
|
|
NOTE: msgpack can encode datetime with tzinfo into standard ext type for now.
|
|
|
|
|
See `datetime` option in `Packer` docstring.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Extended types
|
|
|
|
|
|
|
|
|
|
It is also possible to pack/unpack custom data types using the **ext** type.
|
|
|
|
|
|
|
|
|
|
```pycon
|
|
|
|
|
>>> import msgpack
|
|
|
|
|
>>> import array
|
|
|
|
|
>>> def default(obj):
|
|
|
|
|
... if isinstance(obj, array.array) and obj.typecode == 'd':
|
|
|
|
|
... return msgpack.ExtType(42, obj.tostring())
|
|
|
|
|
... raise TypeError("Unknown type: %r" % (obj,))
|
|
|
|
|
...
|
|
|
|
|
>>> def ext_hook(code, data):
|
|
|
|
|
... if code == 42:
|
|
|
|
|
... a = array.array('d')
|
|
|
|
|
... a.fromstring(data)
|
|
|
|
|
... return a
|
|
|
|
|
... return ExtType(code, data)
|
|
|
|
|
...
|
|
|
|
|
>>> data = array.array('d', [1.2, 3.4])
|
|
|
|
|
>>> packed = msgpack.packb(data, default=default)
|
|
|
|
|
>>> unpacked = msgpack.unpackb(packed, ext_hook=ext_hook)
|
|
|
|
|
>>> data == unpacked
|
|
|
|
|
True
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Advanced unpacking control
|
|
|
|
|
|
|
|
|
|
As an alternative to iteration, `Unpacker` objects provide `unpack`,
|
|
|
|
|
`skip`, `read_array_header` and `read_map_header` methods. The former two
|
|
|
|
|
read an entire message from the stream, respectively de-serialising and returning
|
|
|
|
|
the result, or ignoring it. The latter two methods return the number of elements
|
|
|
|
|
in the upcoming container, so that each element in an array, or key-value pair
|
|
|
|
|
in a map, can be unpacked or skipped individually.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## Notes
|
|
|
|
|
|
|
|
|
|
### string and binary type in old msgpack spec
|
|
|
|
|
|
|
|
|
|
Early versions of msgpack didn't distinguish string and binary types.
|
|
|
|
|
The type for representing both string and binary types was named **raw**.
|
|
|
|
|
|
|
|
|
|
You can pack into and unpack from this old spec using `use_bin_type=False`
|
|
|
|
|
and `raw=True` options.
|
|
|
|
|
|
|
|
|
|
```pycon
|
|
|
|
|
>>> import msgpack
|
|
|
|
|
>>> msgpack.unpackb(msgpack.packb([b'spam', 'eggs'], use_bin_type=False), raw=True)
|
|
|
|
|
[b'spam', b'eggs']
|
|
|
|
|
>>> msgpack.unpackb(msgpack.packb([b'spam', 'eggs'], use_bin_type=True), raw=False)
|
|
|
|
|
[b'spam', 'eggs']
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
### ext type
|
|
|
|
|
|
|
|
|
|
To use the **ext** type, pass `msgpack.ExtType` object to packer.
|
|
|
|
|
|
|
|
|
|
```pycon
|
|
|
|
|
>>> import msgpack
|
|
|
|
|
>>> packed = msgpack.packb(msgpack.ExtType(42, b'xyzzy'))
|
|
|
|
|
>>> msgpack.unpackb(packed)
|
|
|
|
|
ExtType(code=42, data='xyzzy')
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
You can use it with `default` and `ext_hook`. See below.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Security
|
|
|
|
|
|
|
|
|
|
To unpacking data received from unreliable source, msgpack provides
|
|
|
|
|
two security options.
|
|
|
|
|
|
|
|
|
|
`max_buffer_size` (default: `100*1024*1024`) limits the internal buffer size.
|
|
|
|
|
It is used to limit the preallocated list size too.
|
|
|
|
|
|
|
|
|
|
`strict_map_key` (default: `True`) limits the type of map keys to bytes and str.
|
|
|
|
|
While msgpack spec doesn't limit the types of the map keys,
|
|
|
|
|
there is a risk of the hashdos.
|
|
|
|
|
If you need to support other types for map keys, use `strict_map_key=False`.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### Performance tips
|
|
|
|
|
|
|
|
|
|
CPython's GC starts when growing allocated object.
|
|
|
|
|
This means unpacking may cause useless GC.
|
|
|
|
|
You can use `gc.disable()` when unpacking large message.
|
|
|
|
|
|
|
|
|
|
List is the default sequence type of Python.
|
|
|
|
|
But tuple is lighter than list.
|
|
|
|
|
You can use `use_list=False` while unpacking when performance is important.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
## Major breaking changes in the history
|
|
|
|
|
|
|
|
|
|
### msgpack 0.5
|
|
|
|
|
|
|
|
|
|
Package name on PyPI was changed from `msgpack-python` to `msgpack` from 0.5.
|
|
|
|
|
|
|
|
|
|
When upgrading from msgpack-0.4 or earlier, do `pip uninstall msgpack-python` before
|
|
|
|
|
`pip install -U msgpack`.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
### msgpack 1.0
|
|
|
|
|
|
|
|
|
|
* Python 2 support
|
|
|
|
|
|
|
|
|
|
* The extension module does not support Python 2 anymore.
|
|
|
|
|
The pure Python implementation (`msgpack.fallback`) is used for Python 2.
|
|
|
|
|
|
|
|
|
|
* msgpack 1.0.6 drops official support of Python 2.7, as pip and
|
|
|
|
|
GitHub Action (setup-python) no longer support Python 2.7.
|
|
|
|
|
|
|
|
|
|
* Packer
|
|
|
|
|
|
|
|
|
|
* Packer uses `use_bin_type=True` by default.
|
|
|
|
|
Bytes are encoded in bin type in msgpack.
|
|
|
|
|
* The `encoding` option is removed. UTF-8 is used always.
|
|
|
|
|
|
|
|
|
|
* Unpacker
|
|
|
|
|
|
|
|
|
|
* Unpacker uses `raw=False` by default. It assumes str types are valid UTF-8 string
|
|
|
|
|
and decode them to Python str (unicode) object.
|
|
|
|
|
* `encoding` option is removed. You can use `raw=True` to support old format (e.g. unpack into bytes, not str).
|
|
|
|
|
* Default value of `max_buffer_size` is changed from 0 to 100 MiB to avoid DoS attack.
|
|
|
|
|
You need to pass `max_buffer_size=0` if you have large but safe data.
|
|
|
|
|
* Default value of `strict_map_key` is changed to True to avoid hashdos.
|
|
|
|
|
You need to pass `strict_map_key=False` if you have data which contain map keys
|
|
|
|
|
which type is not bytes or str.
|
pacnpal