MessagePack Erlang

Prerequisites for runtime

Erlang/OTP, >= 17.0 Also based on the new msgpack spec 0b8f5a.

edit rebar.config to use in your application

{deps, [
  {msgpack, ".*",
    {git, "git://github.com/msgpack/msgpack-erlang.git", {branch, "master"}}}
]}.

Simple deserialization

Ham = msgpack:pack(Spam),
{ok, Spam} = msgpack:unpack(Ham).

Stream deserialization

{Term0, Rest0} = msgpack:unpack_stream(Binary),
{Term1, Rest1} = msgpack:unpack_stream(Rest0),
...

Options, for packing and unpacking

{spec, new|old}

Both for packing and unpacking. Default is new. Major difference between old and new spec is:

• raw family (0xa0~0xbf, 0xda, 0xdb) becomes new str family
• 0xd9 is new as str8
• new bin space (0xc4, 0xc5, 0xc6 as bin8, bin16, bin32)
• new ext space (0xc7, 0xc8, 0xc9 as ext8, ext16, ext32)
• new fixext space (0xd4, 0xd5, 0xd6, 0xd7, 0xd8 as fixext1, fixext2, fixext4, fixext8, fixext16),

The default is new spec. Old spec mode does not handle these new types but returns error. To use old spec mode, this option is explicitly added.

OldHam = msgpack:pack(Spam, [{spec, old}]),
{ok, Spam} = msgpack:unpack(OldHam, [{spec, old}]).

{allow_atom, none|pack}

Only in packing. Atoms are packed as binaries. Default value is pack.

{known_atoms, [atom()]}

Both in packing and unpacking. In packing, if an atom is in this list a binary is encoded as a binary. In unpacking, msgpacked binaries are decoded as atoms with erlang:binary_to_existing_atom/2 with encoding utf8. Default value is an empty list.

{str, as_binary|as_list}

Both in packing and unpacking. Only available at new spec. Default is as_list.

This option indicates str type family is treated as binary or list in Erlang world.

mode        as_binary    as_list
-----------+------------+-------
packing
binary()    str          bin
string()    bin*         str*
list()      array        array
-----------+------------+-------
unpacking
bin         string()     binary()
str         binary()     string()

• (*) fallback to list() handling if any error found

Opt = [{enable_str, true}]
{ok, "埼玉"} = msgpack:unpack(msgpack:pack("埼玉", Opt), Opt).
 => {ok,[22524,29577]}

{validate_string, boolean()}

Both in packing and unpacking. UTF-8 validation in encoding to str and decoding from str type will be enabled. Default value is true.

{map_format, maps|jiffy|jsx}

Both at packing and unpacking. Default value is maps.

msgpack:pack(#{ <<"key">> => <<"value">> }, []).
msgpack:pack({[{<<"key">>, <<"value">>}]}, [{format, jiffy}]),
msgpack:pack([{<<"key">>, <<"value">>}], [{format, jsx}]).

{ext, {msgpack_ext_packer(), msgpack_ext_unpacker()}|module()}

At both. The default behaviour in case of facing ext data at decoding is to ignore them as its length is known.

Now msgpack-erlang supports ext type. Now you can serialize everything with your original (de)serializer. That will enable us to handle erlang- native types like pid(), ref() contained in tuple(). See test/msgpack_ext_example_tests.erl for example code.

Packer = fun({ref, Ref}, Opt) when is_reference(Ref) -> {ok, {12, term_to_binary(Ref)}} end,
Unpacker = fun(12, Bin) -> {ok, {ref, binary_to_term(Bin)}} end,
Ref = make_ref(),
Opt = [{ext,{Packer,Unpacker}}],
{ok, {ref, Ref}} = msgpack:unpack(msgpack:pack({ref, Ref}, Opt), Opt).

License

Apache License 2.0

Release Notes

0.5.0

• Renewed optional arguments to pack/unpack interface. This is incompatible change from 0.4 series.

0.4.0

• Deprecate nil
• Moved to rebar3
• Promote default map unpacker as default format when OTP is >= 17
• Added QuickCheck tests
• Since this version OTP older than R16B03-1 are no more supported

0.3.5 / 0.3.4

• 0.3 series will be the last versions that supports R16B or older versions of OTP.
• OTP 18.0 support
• Promote default map unpacker as default format when OTP is >= 18

0.3.3

• Add OTP 17 series to Travis-CI tests
• Fix wrong numbering for ext types
• Allow packing maps even when {format,map} is not set
• Fix Dialyzer invalid contract warning
• Proper use of null for jiffy-style encoding/decoding

0.3.2

• set back default style as jiffy
• fix bugs around nil/null handling

0.3.0

• supports map new in 17.0
• jiffy-style maps will be deprecated in near future
• set default style as map

0.2.8

0.2 series works with OTP 17.0, R16, R15, and with MessagePack's new and old format. But does not support map type introduced in OTP 17.0.

It also supports JSX-compatible mode.