Release v2.0.0 · ruby-protobuf/protobuf

New option --ruby_out to specify the output directory to place generated ruby files. If not provided, ruby code will not be generated.
Extends libprotoc to hook in directly to google's provided compiler mechanism.
Removed all previous compiler code including the racc parser, node visitors, etc.
See protoc --help for default options.

Import requires now occur outside of any module or class declaration which solves ruby vm warnings previously seen.
Empty inherited Message and Enum classes are pre-defined in the file, then reopened and their fields applied. This solves the issue of recursive field dependencies of two or more types in the same file.
Generated DSL lines for message fields include the fully qualified name of the type (e.g. optional ::Protobuf::Field::StringField, :name, 1)
Support for any combination of packed, deprecated, and default as options to pass to a field definition.
Services are now generated in the corresponding .pb.rb file instead of their own *_service.rb files as before.

Removed --env option. The running application or program is solely in charge of ensuring it's environment is properly loaded.
Removed reading of PB_CLIENT_TYPE, PB_SERVER_TYPE environment variables. Should use mode switches or custom requires (see below) instead.
Removed --client_socket in favor of using mode switches. This also means client calls made by the rpc_server will run as the same connector type as the given mode (socket, zmq, or evented).
Removed --pre-cache-definitions switch in favor of always pre-caching for performance.
Removed --gc-pause-serialization since using --gc-pause-request in conjunction was redundant.
Removed --client-type in favor of mode switches.
Removed --server-type in favor of mode switches.
Added mode switch --evented.
Added --threads to specify number of ZMQ Worker threads to use. Ignored if mode is not zmq.
Added --print-deprecation-warnings switch to tell the server whether or not to print deprecation warnings on field usage. Enabled by default.
See rpc_server help start for all options and usage. Note: the start task is the default and not necessary when running the rpc_server.

Message#get_field usage should now specify either Message#get_field_by_name or Message#get_field_by_tag, depending on your lookup criteria.
Support for STDERR output when accessing a message field which has been defined as [deprecated=true]. Deprecated warnings can be skipped by running your application or program with PB_IGNORE_DEPRECATIONS=1.
Significant internal refactoring which provides huge boosts in speed and efficiency both in accessing/writing Message field values, as well as serialization and deserialization routines.
Refactor Message#to_hash to delegate hash representations to the field values, simply collecting the display values and returning a hash of fields that are set. This also affects to_json output.

Add Enum.fetch class method to polymorphically retrieve an EnumValue object.
Add Enum.value_by_name to retrieve the corresponding EnumValue to the given symbol name.
Add Enum.enum_by_value to retrieve the corresponding EnumValue to the given integer value.

async_responder paradigm is no longer supported.
self.response= paradigm should be converted to using respond_with(object).
Significant internal changes that should not bleed beyond the API but which make maintaining the code much easier.

In the absence of PB_CLIENT_TYPE environment var, you should be requiring the specific connector type specifically. For instance, if you wish to run in zmq mode for client requests, update your Gemfile: gem 'protobuf', :require => 'protobuf/zmq'.
:async option on client calls is no longer recognized.

Moved files out of lib/protobuf/common folder into lib/protobuf. Files affected are logger, wire_type, util. The only update would need to be the require path to these files since the modules were always Protobuf::{TYPE}.

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