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https://github.com/ngerakines/erlang_protobuffs
A set of Protocol Buffers tools and modules for Erlang applications.
https://github.com/ngerakines/erlang_protobuffs
Last synced: 3 days ago
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A set of Protocol Buffers tools and modules for Erlang applications.
- Host: GitHub
- URL: https://github.com/ngerakines/erlang_protobuffs
- Owner: ngerakines
- Created: 2008-12-19T07:56:27.000Z (about 16 years ago)
- Default Branch: master
- Last Pushed: 2020-06-04T10:39:52.000Z (over 4 years ago)
- Last Synced: 2024-12-11T15:47:14.744Z (12 days ago)
- Language: Erlang
- Homepage:
- Size: 340 KB
- Stars: 130
- Watchers: 11
- Forks: 41
- Open Issues: 8
-
Metadata Files:
- Readme: README.markdown
- Changelog: ChangeLog
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README
# README
This module is a composite of other open source modules and original code to
make interfacing with the Protocol Buffers protocol easy.## Encode / Decode
Encoding is simple.
1> protobuffs:encode(1, 1, uint32).
<<8,1>>
2> erlang:iolist_to_binary([
protobuffs:encode(1, <<"Nick">>, string),
protobuffs:encode(2, 25, uint32)
]).
<<10,4,78,105,99,107,16,25>>Decoding is simple too.
1> protobuffs:decode(<<8, 1>>, uint32).
{{1, 1}, <<>>}
2> protobuffs:decode(<<10,4,78,105,99,107,16,25>>, bytes).
{{1, <<"Nick">>}, <<16,25>>}
3> protobuffs:decode(<<16,25>>, bytes).
{{2, 25}, <<>>}## Using .proto Files
The main objective of this module is to allow developers to use .proto files
easily. This module provides very basic functionality to do so.Consider the `t/simple.proto` file.
message Person {
required string name = 1;
required string address = 2;
required string phone_number = 3;
required int32 age = 4;
}From that file we can create an Erlang module that can encode and decode the
Person message into records.1> protobuffs_compile:scan_file("simple.proto").
ok
2> simple_pb:decode_person(<<10,4,78,105,99,107,18,13,77,111,...>>).
{person,<<"Nick">>,<<"Mountain View">>, <<"+1 (000) 555-1234">>,25}
3> simple_pb:encode_person({person, <<"Nick">>, <<"Mountain View">>,
<<"+1 (000) 555-1234">>,25}).
<<10,4,78,105,99,107,18,13,77,111,117,110,116,97,105,110,32,86,105,...>>How cool is that? From .proto files, we create modules that export encode and
decode functions for the messages defined.## CAVEATS
Support for parsing proto files and creating code from it is volatile and
should be considered alpha software at best. It currently only supports flat
messages, simple types (ints, strings, etc) and will break on ENUM types and
any sort of nesting. Please do not use this in production.## no_debug_info
The protobuffs_compile module relies on the pokemon_pb module being compiled
with debug info. This is because pokemon_pb serves as a template for generated
_pb modules. Running protobuffs_compile:scan_file/1 reads the erlang forms from
the pokemon_pb.beam file and expands and alters those forms to create the generated
module.## CREDITS
Some of the protobuffs.erl module came from code written by Brian Buchanan.
Some of the protobuffs\_compile.erl module came from code written by Tim
Fletcher.The rest of it and it's test suite was written by Nick Gerakines. Major
contributions have been made by Jacob Vorreuter.