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Releases: protocolbuffers/protobuf

Protocol Buffers v3.2.0

17 Feb 19:53
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General

  • Added protoc version number to protoc plugin protocol. It can be used by
    protoc plugin to detect which version of protoc is used with the plugin and
    mitigate known problems in certain version of protoc.

C++

  • The default parsing byte size limit has been raised from 64MB to 2GB.
  • Added rvalue setters for non-arena string fields.
  • Enabled debug logging for Android.
  • Fixed a double-free problem when using Reflection::SetAllocatedMessage()
    with extension fields.
  • Fixed several deterministic serialization bugs:
  • MessageLite::SerializeAsString() now respects the global deterministic
    serialization flag.
  • Extension fields are serialized deterministically as well. Fixed protocol
    compiler to correctly report importing-self as an error.
  • Fixed FileDescriptor::DebugString() to print custom options correctly.
  • Various performance/codesize optimizations and cleanups.

Java

  • The default parsing byte size limit has been raised from 64MB to 2GB.
  • Added recursion limit when parsing JSON.
  • Fixed a bug that enumType.getDescriptor().getOptions() doesn't have custom
    options.
  • Fixed generated code to support field numbers up to 2^29-1.

Python

  • You can now assign NumPy scalars/arrays (np.int32, np.int64) to protobuf
    fields, and assigning other numeric types has been optimized for
    performance.
  • Pure-Python: message types are now garbage-collectable.
  • Python/C++: a lot of internal cleanup/refactoring.

PHP (Alpha)

  • For 64-bit integers type (int64/uint64/sfixed64/fixed64/sint64), use PHP
    integer on 64-bit environment and PHP string on 32-bit environment.
  • PHP generated code also conforms to PSR-4 now.
  • Fixed ZTS build for c extension.
  • Fixed c extension build on Mac.
  • Fixed c extension build on 32-bit linux.
  • Fixed the bug that message without namespace is not found in the descriptor
    pool. (#2240)
  • Fixed the bug that repeated field is not iterable in c extension.
  • Message names Empty will be converted to GPBEmpty in generated code.
  • Added phpdoc in generated files.
  • The released API is almost stable. Unless there is large problem, we won't
    change it. See
    https://developers.google.com/protocol-buffers/docs/reference/php-generated
    for more details.

Objective-C

  • Added support for push/pop of the stream limit on CodedInputStream for
    anyone doing manual parsing.

C#

  • No changes.

Ruby

  • Message objects now support #respond_to? for field getters/setters.
  • You can now compare “message == non_message_object” and it will return false
    instead of throwing an exception.
  • JRuby: fixed #hashCode to properly reflect the values in the message.

Javascript

  • Deserialization of repeated fields no longer has quadratic performance
    behavior.
  • UTF-8 encoding/decoding now properly supports high codepoints.
  • Added convenience methods for some well-known types: Any, Struct, and
    Timestamp. These make it easier to convert data between native JavaScript
    types and the well-known protobuf types.

Protocol Buffers v3.2.0rc2

19 Jan 01:25
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Pre-release

Release candidate for v3.2.0.

Protocol Buffers v3.1.0

24 Sep 02:39
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General

  • Proto3 support in PHP (alpha).
  • Various bug fixes.

C++

  • Added MessageLite::ByteSizeLong() that’s equivalent to
    MessageLite::ByteSize() but returns the value in size_t. Useful to check
    whether a message is over the 2G size limit that protobuf can support.
  • Moved default_instances to global variables. This allows default_instance
    addresses to be known at compile time.
  • Adding missing generic gcc 64-bit atomicops.
  • Restore New*Callback into google::protobuf namespace since these are used
    by the service stubs code
  • JSON support.
    • Fixed some conformance issues.
  • Fixed a JSON serialization bug for bytes fields.

Java

  • Fixed a bug in TextFormat that doesn’t accept empty repeated fields (i.e.,
    “field: [ ]”).
  • JSON support
    • Fixed JsonFormat to do correct snake_case-to-camelCase conversion for
      non-style-conforming field names.
    • Fixed JsonFormat to parse empty Any message correctly.
    • Added an option to JsonFormat.Parser to ignore unknown fields.
  • Experimental API
    • Added UnsafeByteOperations.unsafeWrap(byte[]) to wrap a byte array into
      ByteString without copy.

Python

  • JSON support
    • Fixed some conformance issues.

PHP (Alpha)

  • We have added the proto3 support for PHP via both a pure PHP package and a
    native c extension. The pure PHP package is intended to provide usability
    to wider range of PHP platforms, while the c extension is intended to
    provide higher performance. Both implementations provide the same runtime
    APIs and share the same generated code. Users don’t need to re-generate
    code for the same proto definition when they want to switch the
    implementation later. The pure PHP package is included in the php/src
    directory, and the c extension is included in the php/ext directory.

    Both implementations provide idiomatic PHP APIs:

    • All messages and enums are defined as PHP classes.
    • All message fields can only be accessed via getter/setter.
    • Both repeated field elements and map elements are stored in containers
      that act like a normal PHP array.

    Unlike several existing third-party PHP implementations for protobuf, our
    implementations are built on a "strongly-typed" philosophy: message fields
    and array/map containers will throw exceptions eagerly when values of the
    incorrect type (not including those that can be type converted, e.g.,
    double <-> integer <-> numeric string) are inserted.

    Currently, pure PHP runtime supports php5.5, 5.6 and 7 on linux. C
    extension runtime supports php5.5 and 5.6 on linux.

    See php/README.md for more details about installment. See
    https://developers.google.com/protocol-buffers/docs/phptutorial for more
    details about APIs.

Objective-C

  • Helpers are now provided for working the the Any well known type (see
    GPBWellKnownTypes.h for the api additions).
  • Some improvements in startup code (especially when extensions aren’t used).

Javascript

  • Fixed missing import of jspb.Map
  • Fixed valueWriterFn variable name

Ruby

  • Fixed hash computation for JRuby's RubyMessage
  • Make sure map parsing frames are GC-rooted.
  • Added API support for well-known types.

C#

  • Removed check on dependency in the C# reflection API.

Protocol Buffers v3.0.2

06 Sep 22:54
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General

  • Various bug fixes.

Objective C

  • Fix for oneofs in proto3 syntax files where fields were set to the zero
    value.
  • Fix for embedded null character in strings.
  • CocoaDocs support

Ruby

  • Fixed memory corruption bug in parsing that could occur under GC pressure.

Javascript

  • jspb.Map is now properly exported to CommonJS modules.

C#

  • Removed legacy_enum_values flag.

Protocol Buffers v3.0.0

28 Jul 05:03
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Version 3.0.0

This change log summarizes all the changes since the last stable release
(v2.6.1). See the last section about changes since v3.0.0-beta-4.

Proto3

  • Introduced Protocol Buffers language version 3 (aka proto3).

    When protocol buffers was initially open sourced it implemented Protocol
    Buffers language version 2 (aka proto2), which is why the version number
    started from v2.0.0. From v3.0.0, a new language version (proto3) is
    introduced while the old version (proto2) will continue to be supported.

    The main intent of introducing proto3 is to clean up protobuf before pushing
    the language as the foundation of Google's new API platform. In proto3, the
    language is simplified, both for ease of use and to make it available in a
    wider range of programming languages. At the same time a few features are
    added to better support common idioms found in APIs.

    The following are the main new features in language version 3:

    1. Removal of field presence logic for primitive value fields, removal of
      required fields, and removal of default values. This makes proto3
      significantly easier to implement with open struct representations, as
      in languages like Android Java, Objective C, or Go.
    2. Removal of unknown fields.
    3. Removal of extensions, which are instead replaced by a new standard
      type called Any.
    4. Fix semantics for unknown enum values.
    5. Addition of maps (back-ported to proto2)
    6. Addition of a small set of standard types for representation of time,
      dynamic data, etc (back-ported to proto2)
    7. A well-defined encoding in JSON as an alternative to binary proto
      encoding.

    A new notion "syntax" is introduced to specify whether a .proto file
    uses proto2 or proto3:

    // foo.proto
    syntax = "proto3";
    message Bar {...}
    

    If omitted, the protocol buffer compiler generates a warning and "proto2" is
    used as the default. This warning will be turned into an error in a future
    release.

    We recommend that new Protocol Buffers users use proto3. However, we do not
    generally recommend that existing users migrate from proto2 from proto3 due
    to API incompatibility, and we will continue to support proto2 for a long
    time.

    Other significant changes in proto3.

  • Explicit "optional" keyword are disallowed in proto3 syntax, as fields are
    optional by default; required fields are no longer supported.

  • Removed non-zero default values and field presence logic for non-message
    fields. e.g. has_xxx() methods are removed; primitive fields set to default
    values (0 for numeric fields, empty for string/bytes fields) will be skipped
    during serialization.

  • Group fields are no longer supported in proto3 syntax.

  • Changed repeated primitive fields to use packed serialization by default in
    proto3 (implemented for C++, Java, Python in this release). The user can
    still disable packed serialization by setting packed to false for now.

  • Added well-known type protos (any.proto, empty.proto, timestamp.proto,
    duration.proto, etc.). Users can import and use these protos just like
    regular proto files. Additional runtime support are available for each
    language.

  • Proto3 JSON is supported in several languages (fully supported in C++, Java,
    Python and C# partially supported in Ruby). The JSON spec is defined in the
    proto3 language guide:

    https://developers.google.com/protocol-buffers/docs/proto3#json

    We will publish a more detailed spec to define the exact behavior of
    proto3-conformant JSON serializers and parsers. Until then, do not rely
    on specific behaviors of the implementation if it’s not documented in
    the above spec.

  • Proto3 enforces strict UTF-8 checking. Parsing will fail if a string
    field contains non UTF-8 data.

General

  • Introduced new language implementations (C#, JavaScript, Ruby, Objective-C)
    to proto3.

  • Added support for map fields (implemented in both proto2 and proto3).
    Map fields can be declared using the following syntax:

    message Foo {
      map<string, string> values = 1;
    }
    

    The data of a map field is stored in memory as an unordered map and
    can be accessed through generated accessors.

  • Added a "reserved" keyword in both proto2 and proto3 syntax. Users can use
    this keyword to declare reserved field numbers and names to prevent them
    from being reused by other fields in the same message.

    To reserve field numbers, add a reserved declaration in your message:

    message TestMessage {
      reserved 2, 15, 9 to 11, 3;
    }
    

    This reserves field numbers 2, 3, 9, 10, 11 and 15. If a user uses any of
    these as field numbers, the protocol buffer compiler will report an error.

    Field names can also be reserved:

    message TestMessage {
      reserved "foo", "bar";
    }
    
  • Added a deterministic serialization API (currently available in C++). The
    deterministic serialization guarantees that given a binary, equal messages
    will be serialized to the same bytes. This allows applications like
    MapReduce to group equal messages based on the serialized bytes. The
    deterministic serialization is, however, NOT canonical across languages; it
    is also unstable across different builds with schema changes due to unknown
    fields. Users who need canonical serialization, e.g. persistent storage in
    a canonical form, fingerprinting, etc, should define their own
    canonicalization specification and implement the serializer using reflection
    APIs rather than relying on this API.

  • Added a new field option "json_name". By default proto field names are
    converted to "lowerCamelCase" in proto3 JSON format. This option can be
    used to override this behavior and specify a different JSON name for the
    field.

  • Added conformance tests to ensure implementations are following proto3 JSON
    specification.

C++

  • Added arena allocation support (for both proto2 and proto3).

    Profiling shows memory allocation and deallocation constitutes a significant
    fraction of CPU-time spent in protobuf code and arena allocation is a
    technique introduced to reduce this cost. With arena allocation, new
    objects are allocated from a large piece of preallocated memory and
    deallocation of these objects is almost free. Early adoption shows 20% to
    50% improvement in some Google binaries.

    To enable arena support, add the following option to your .proto file:

    option cc_enable_arenas = true;
    

    The protocol buffer compiler will generate additional code to make the generated
    message classes work with arenas. This does not change the existing API
    of protobuf messages and does not affect wire format. Your existing code
    should continue to work after adding this option. In the future we will
    make this option enabled by default.

    To actually take advantage of arena allocation, you need to use the arena
    APIs when creating messages. A quick example of using the arena API:

    {
      google::protobuf::Arena arena;
      // Allocate a protobuf message in the arena.
      MyMessage* message = Arena::CreateMessage<MyMessage>(&arena);
      // All submessages will be allocated in the same arena.
      if (!message->ParseFromString(data)) {
        // Deal with malformed input data.
      }
      // Must not delete the message here. It will be deleted automatically
      // when the arena is destroyed.
    }
    

    Currently arena allocation does not work with map fields. Enabling arenas in a .proto
    file containing map fields will result in compile errors in the generated
    code. This will be addressed in a future release.

  • Added runtime support for the Any type. To use Any in your proto file, first
    import the definition of Any:

    // foo.proto
    import "google/protobuf/any.proto";
    message Foo {
      google.protobuf.Any any_field = 1;
    }
    message Bar {
      int32 value = 1;
    }
    

    Then in C++ you can access the Any field using PackFrom()/UnpackTo()
    methods:

    Foo foo;
    Bar bar = ...;
    foo.mutable_any_field()->PackFrom(bar);
    ...
    if (foo.any_field().IsType<Bar>()) {
      foo.any_field().UnpackTo(&bar);
      ...
    }
    
  • In text format, the entries of a map field will be sorted by key.

  • Introduced new utility functions/classes in the google/protobuf/util
    directory:

    • MessageDifferencer: compare two proto messages and report their
      differences.
    • JsonUtil: support converting protobuf binary format to/from JSON.
    • TimeUtil: utility functions to work with well-known types Timestamp
      and Duration.
    • FieldMaskUtil: utility functions to work with FieldMask.
  • Introduced a deterministic serialization API in
    CodedOutputStream::SetSerializationDeterministic(bool). See the notes about
    deterministic serialization in the General section.

Java

  • Introduced a new util package that will be distributed as a separate
    artifact in maven. It contains:
    • JsonFormat: convert proto messages to/from JSON.
    • Timestamps/Durations: utility functions to work with Timestamp and Duration.
    • FieldMaskUtil: utility functions to work with FieldMask.
  • Introduced an ExperimentalApi annotation. Annotated APIs are experimental
    and are subject to change in a backward incompatible way in future releases.
  • Introduced zero-copy serialization as an ExperimentalApi
    • Introduction of the ByteOutput interface. This is similar to
      OutputStream but provides semantics for lazy writing (i.e. no
      immediate copy required) of fields that are considered to be immutable.
    • ByteString now supports writing to a ByteOutput, which will directly
      expose the internals of the ByteString (i.e. byte[] or ByteBuffer)
      to the ByteOutput without copying.
    • CodedOutputStream now supports writing to a ByteOutput. ByteString
      instances that are too large to fit in the internal buffer will be
      (lazily) written to the ByteOutput directly.
      ...
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Protocol Buffers v3.0.0-beta-4

20 Jul 00:40
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Version 3.0.0-beta-4

General

  • Added a deterministic serialization API for C++. The deterministic
    serialization guarantees that given a binary, equal messages will be
    serialized to the same bytes. This allows applications like MapReduce to
    group equal messages based on the serialized bytes. The deterministic
    serialization is, however, NOT canonical across languages; it is also
    unstable across different builds with schema changes due to unknown fields.
    Users who need canonical serialization, e.g. persistent storage in a
    canonical form, fingerprinting, etc, should define their own
    canonicalization specification and implement the serializer using reflection
    APIs rather than relying on this API.

  • Added OneofOptions. You can now define custom options for oneof groups.

    import "google/protobuf/descriptor.proto";
    extend google.protobuf.OneofOptions {
      optional int32 my_oneof_extension = 12345;
    }
    message Foo {
      oneof oneof_group {
        (my_oneof_extension) = 54321;
        ...
      }
    }
    

C++ (beta)

  • Introduced a deterministic serialization API in
    CodedOutputStream::SetSerializationDeterministic(bool). See the notes about
    deterministic serialization in the General section.
  • Added google::protobuf::Map::swap() to swap two map fields.
  • Fixed a memory leak when calling Reflection::ReleaseMessage() on a message
    allocated on arena.
  • Improved error reporting when parsing text format protos.
  • JSON
    • Added a new parser option to ignore unknown fields when parsing JSON.
    • Added convenient methods for message to/from JSON conversion.
  • Various performance optimizations.

Java (beta)

  • File option "java_generate_equals_and_hash" is now deprecated. equals() and
    hashCode() methods are generated by default.
  • Added a new JSON printer option "omittingInsignificantWhitespace" to produce
    a more compact JSON output. The printer will pretty-print by default.
  • Updated Java runtime to be compatible with 2.5.0/2.6.1 generated protos.

Python (beta)

  • Added support to pretty print Any messages in text format.
  • Added a flag to ignore unknown fields when parsing JSON.
  • Bugfix: "@type" field of a JSON Any message is now correctly put before
    other fields.

Objective-C (beta)

  • Updated the code to support compiling with more compiler warnings
    enabled. (Issue 1616)
  • Exposing more detailed errors for parsing failures. (PR 1623)
  • Small (breaking) change to the naming of some methods on the support classes
    for map<>. There were collisions with the system provided KVO support, so
    the names were changed to avoid those issues. (PR 1699)
  • Fixed for proper Swift bridging of error handling during parsing. (PR 1712)
  • Complete support for generating sources that will go into a Framework and
    depend on generated sources from other Frameworks. (Issue 1457)

C# (beta)

  • RepeatedField optimizations.
  • Support for .NET Core.
  • Minor bug fixes.
  • Ability to format a single value in JsonFormatter (advanced usage only).
  • Modifications to attributes applied to generated code.

Javascript (alpha)

  • Maps now have a real map API instead of being treated as repeated fields.
  • Well-known types are now provided in the google-protobuf package, and the
    code generator knows to require() them from that package.
  • Bugfix: non-canonical varints are correctly decoded.

Ruby (alpha)

  • Accessors for oneof fields now return default values instead of nil.

Java Lite

  • Java lite support is removed from protocol compiler. It will be supported
    as a protocol compiler plugin in a separate code branch.

Protocol Buffers v3.0.0-beta-3.1

14 Jun 18:42
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Fix iOS framework.

Protocol Buffers v3.0.0-beta-3

16 May 20:32
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Version 3.0.0-beta-3

General

  • Supported Proto3 lite-runtime in C++/Java for mobile platforms.
  • Any type now supports APIs to specify prefixes other than
    type.googleapis.com
  • Removed javanano_use_deprecated_package option; Nano will always has its own
    ".nano" package.

C++ (Beta)

  • Improved hash maps.
    • Improved hash maps comments. In particular, please note that equal hash
      maps will not necessarily have the same iteration order and
      serialization.
    • Added a new hash maps implementation that will become the default in a
      later release.
  • Arenas
    • Several inlined methods in Arena were moved to out-of-line to improve
      build performance and code size.
    • Added SpaceAllocatedAndUsed() to report both space used and allocated
    • Added convenient class UnsafeArenaAllocatedRepeatedPtrFieldBackInserter
  • Any
    • Allow custom type URL prefixes in Any packing.
    • TextFormat now expand the Any type rather than printing bytes.
  • Performance optimizations and various bug fixes.

Java (Beta)

  • Introduced an ExperimentalApi annotation. Annotated APIs are experimental
    and are subject to change in a backward incompatible way in future releases.
  • Introduced zero-copy serialization as an ExperimentalApi
    • Introduction of the ByteOutput interface. This is similar to
      OutputStream but provides semantics for lazy writing (i.e. no
      immediate copy required) of fields that are considered to be immutable.
    • ByteString now supports writing to a ByteOutput, which will directly
      expose the internals of the ByteString (i.e. byte[] or ByteBuffer)
      to the ByteOutput without copying.
    • CodedOutputStream now supports writing to a ByteOutput. ByteString
      instances that are too large to fit in the internal buffer will be
      (lazily) written to the ByteOutput directly.
    • This allows applications using large ByteString fields to avoid
      duplication of these fields entirely. Such an application can supply a
      ByteOutput that chains together the chunks received from
      CodedOutputStream before forwarding them onto the IO system.
  • Other related changes to CodedOutputStream
    • Additional use of sun.misc.Unsafe where possible to perform fast
      access to byte[] and ByteBuffer values and avoiding unnecessary
      range checking.
    • ByteBuffer-backed CodedOutputStream now writes directly to the
      ByteBuffer rather than to an intermediate array.
  • Improved lite-runtime.
    • Lite protos now implement deep equals/hashCode/toString
    • Significantly improved the performance of Builder#mergeFrom() and
      Builder#mergeDelimitedFrom()
  • Various bug fixes and small feature enhancement.
    • Fixed stack overflow when in hashCode() for infinite recursive oneofs.
    • Fixed the lazy field parsing in lite to merge rather than overwrite.
    • TextFormat now supports reporting line/column numbers on errors.
    • Updated to add appropriate @OverRide for better compiler errors.

Python (Beta)

  • Added JSON format for Any, Struct, Value and ListValue
  • "[ ]" is now accepted for both repeated scalar fields and repeated message
    fields in text format parser.
  • Numerical field name is now supported in text format.
  • Added DiscardUnknownFields API for python protobuf message.

Objective-C (Beta)

  • Proto comments now come over as HeaderDoc comments in the generated sources
    so Xcode can pick them up and display them.
  • The library headers have been updated to use HeaderDoc comments so Xcode can
    pick them up and display them.
  • The per message and per field overhead in both generated code and runtime
    object sizes was reduced.
  • Generated code now include deprecated annotations when the proto file
    included them.

C# (Beta)

In general: some changes are breaking, which require regenerating messages.
Most user-written code will not be impacted except for the renaming of enum
values.

  • Allow custom type URL prefixes in Any packing, and ignore them when
    unpacking
  • protoc is now in a separate NuGet package (Google.Protobuf.Tools)
  • New option: internal_access to generate internal classes
  • Enum values are now PascalCased, and if there's a prefix which matches the
    name of the enum, that is removed (so an enum COLOR with a value
    COLOR_BLUE would generate a value of just Blue). An option
    (legacy_enum_values) is temporarily available to disable this, but the
    option will be removed for GA.
  • json_name option is now honored
  • If group tags are encountered when parsing, they are validated more
    thoroughly (although we don't support actual groups)
  • NuGet dependencies are better specified
  • Breaking: Preconditions is renamed to ProtoPreconditions
  • Breaking: GeneratedCodeInfo is renamed to GeneratedClrTypeInfo
  • JsonFormatter now allows writing to a TextWriter
  • New interface, ICustomDiagnosticMessage to allow more compact
    representations from ToString
  • CodedInputStream and CodedOutputStream now implement IDisposable,
    which simply disposes of the streams they were constructed with
  • Map fields no longer support null values (in line with other languages)
  • Improvements in JSON formatting and parsing

Javascript (Alpha)

  • Better support for "bytes" fields: bytes fields can be read as either a
    base64 string or UInt8Array (in environments where TypedArray is supported).
  • New support for CommonJS imports. This should make it easier to use the
    JavaScript support in Node.js and tools like WebPack. See js/README.md for
    more information.
  • Some significant internal refactoring to simplify and modularize the code.

Ruby (Alpha)

  • JSON serialization now properly uses camelCased names, with a runtime option
    that will preserve original names from .proto files instead.
  • Well-known types are now included in the distribution.
  • Release now includes binary gems for Windows, Mac, and Linux instead of just
    source gems.
  • Bugfix for serializing oneofs.

C++/Java Lite (Alpha)

A new "lite" generator parameter was introduced in the protoc for C++ and
Java for Proto3 syntax messages. Example usage:

 ./protoc --cpp_out=lite:$OUTPUT_PATH foo.proto

The protoc will treat the current input and all the transitive dependencies
as LITE. The same generator parameter must be used to generate the
dependencies.

In Proto3 syntax files, "optimized_for=LITE_RUNTIME" is no longer supported.

Protocol Buffers v3.0.0-beta-2

30 Dec 21:36
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Version 3.0.0-beta-2

General

  • Introduced a new language implementation: JavaScript.
  • Added a new field option "json_name". By default proto field names are
    converted to "lowerCamelCase" in proto3 JSON format. This option can be
    used to override this behavior and specify a different JSON name for the
    field.
  • Added conformance tests to ensure implementations are following proto3 JSON
    specification.

C++ (Beta)

  • Various bug fixes and improvements to the JSON support utility:
    • Duplicate map keys in JSON are now rejected (i.e., translation will
      fail).
    • Fixed wire-format for google.protobuf.Value/ListValue.
    • Fixed precision loss when converting google.protobuf.Timestamp.
    • Fixed a bug when parsing invalid UTF-8 code points.
    • Fixed a memory leak.
    • Reduced call stack usage.

Java (Beta)

  • Cleaned up some unused methods on CodedOutputStream.
  • Presized lists for packed fields during parsing in the lite runtime to
    reduce allocations and improve performance.
  • Improved the performance of unknown fields in the lite runtime.
  • Introduced UnsafeByteStrings to support zero-copy ByteString creation.
  • Various bug fixes and improvements to the JSON support utility:
    • Fixed a thread-safety bug.
    • Added a new option “preservingProtoFieldNames” to JsonFormat.
    • Added a new option “includingDefaultValueFields” to JsonFormat.
    • Updated the JSON utility to comply with proto3 JSON specification.

Python (Beta)

  • Added proto3 JSON format utility. It includes support for all field types
    and a few well-known types except for Any and Struct.
  • Added runtime support for Any, Timestamp, Duration and FieldMask.
  • "[ ]" is now accepted for repeated scalar fields in text format parser.

Objective-C (Beta)

  • Various bug-fixes and code tweaks to pass more strict compiler warnings.
  • Now has conformance test coverage and is passing all tests.

C# (Beta)

  • Various bug-fixes.
  • Code generation: Files generated in directories based on namespace.
  • Code generation: Include comments from .proto files in XML doc
    comments (naively)
  • Code generation: Change organization/naming of "reflection class" (access
    to file descriptor)
  • Code generation and library: Add Parser property to MessageDescriptor,
    and introduce a non-generic parser type.
  • Library: Added TypeRegistry to support JSON parsing/formatting of Any.
  • Library: Added Any.Pack/Unpack support.
  • Library: Implemented JSON parsing.

Javascript (Alpha)

  • Added proto3 support for JavaScript. The runtime is written in pure
    JavaScript and works in browsers and in Node.js. To generate JavaScript
    code for your proto, invoke protoc with "--js_out". See js/README.md
    for more build instructions.

Protocol Buffers v3.0.0-beta-1

27 Aug 07:09
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Pre-release

Version 3.0.0-beta-1

Supported languages

  • C++/Java/Python/Ruby/Nano/Objective-C/C#

About Beta

  • This is the first beta release of protobuf v3.0.0. Not all languages
    have reached beta stage. Languages not marked as beta are still in
    alpha (i.e., be prepared for API breaking changes).

General

  • Proto3 JSON is supported in several languages (fully supported in C++
    and Java, partially supported in Ruby/C#). The JSON spec is defined in
    the proto3 language guide:

    https://developers.google.com/protocol-buffers/docs/proto3#json

    We will publish a more detailed spec to define the exact behavior of
    proto3-conformant JSON serializers and parsers. Until then, do not rely
    on specific behaviors of the implementation if it’s not documented in
    the above spec. More specifically, the behavior is not yet finalized for
    the following:

    • Parsing invalid JSON input (e.g., input with trailing commas).
    • Non-camelCase names in JSON input.
    • The same field appears multiple times in JSON input.
    • JSON arrays contain “null” values.
    • The message has unknown fields.
  • Proto3 now enforces strict UTF-8 checking. Parsing will fail if a string
    field contains non UTF-8 data.

C++ (Beta)

  • Introduced new utility functions/classes in the google/protobuf/util
    directory:
    • MessageDifferencer: compare two proto messages and report their
      differences.
    • JsonUtil: support converting protobuf binary format to/from JSON.
    • TimeUtil: utility functions to work with well-known types Timestamp
      and Duration.
    • FieldMaskUtil: utility functions to work with FieldMask.
  • Performance optimization of arena construction and destruction.
  • Bug fixes for arena and maps support.
  • Changed to use cmake for Windows Visual Studio builds.
  • Added Bazel support.

Java (Beta)

  • Introduced a new util package that will be distributed as a separate
    artifact in maven. It contains:
    • JsonFormat: convert proto messages to/from JSON.
    • TimeUtil: utility functions to work with Timestamp and Duration.
    • FieldMaskUtil: utility functions to work with FieldMask.
  • The static PARSER in each generated message is deprecated, and it will
    be removed in a future release. A static parser() getter is generated
    for each message type instead.
  • Performance optimizations for String fields serialization.
  • Performance optimizations for Lite runtime on Android:
    • Reduced allocations
    • Reduced method overhead after ProGuarding
    • Reduced code size after ProGuarding

Python (Alpha)

  • Removed legacy Python 2.5 support.
  • Moved to a single Python 2.x/3.x-compatible codebase, instead of using 2to3.
  • Fixed build/tests on Python 2.6, 2.7, 3.3, and 3.4.
    • Pure-Python works on all four.
    • Python/C++ implementation works on all but 3.4, due to changes in the
      Python/C++ API in 3.4.
  • Some preliminary work has been done to allow for multiple DescriptorPools
    with Python/C++.

Ruby (Alpha)

  • Many bugfixes:
    • fixed parsing/serialization of bytes, sint, sfixed types
    • other parser bugfixes
    • fixed memory leak affecting Ruby 2.2

JavaNano (Alpha)

  • JavaNano generated code now will be put in a nano package by default to
    avoid conflicts with Java generated code.

Objective-C (Alpha)

  • Added non-null markup to ObjC library. Requires SDK 8.4+ to build.
  • Many bugfixes:
    • Removed the class/enum filter.
    • Renamed some internal types to avoid conflicts with the well-known types
      protos.
    • Added missing support for parsing repeated primitive fields in packed or
      unpacked forms.
    • Added *Count for repeated and map<> fields to avoid auto-create when
      checking for them being set.

C# (Alpha)

  • Namespace changed to Google.Protobuf (and NuGet package will be named
    correspondingly).
  • Target platforms now .NET 4.5 and selected portable subsets only.
  • Removed lite runtime.
  • Reimplementation to use mutable message types.
  • Null references used to represent "no value" for message type fields.
  • Proto3 semantics supported; proto2 files are prohibited for C# codegen.
    Most proto3 features supported:
    • JSON formatting (a.k.a. serialization to JSON), including well-known
      types (except for Any).
    • Wrapper types mapped to nullable value types (or string/ByteString
      allowing nullability). JSON parsing is not supported yet.
    • maps
    • oneof
    • enum unknown value preservation