protoc-gen-php --php_out: protoc-gen-php: Plugin output is unparseable.

背景

业务需要用protobuffer 进行通讯。

client: php

server: c++

在github 上找到 Protobuf-PHP （https://github.com/drslump/Protobuf-PHP） 的评分不错，故采用它作为协议生成库来生成PHP侧的交互协议。

问题

生成php proto

protoc --plugin=/usr/local/php/bin/protoc-gen-php --php_out=. -I. tutorial.proto

报错：--php_out: protoc-gen-php: Plugin output is unparseable.

proto 文件 tutorial.proto 如下：

package tutorial;

message Person {
   required string name = ;
   required int32 id = ;
   optional string email = ;

    enum PhoneType {
        MOBILE = ;
        HOME = ;
        WORK = ;
   }

   message PhoneNumber {
        required string number = ;
        optional PhoneType type =  [default = HOME];
   }

   repeated PhoneNumber phone = ;
}  

message AddressBook {
   repeated Person person = ;
}

定位与解决

PHP日志跟踪发现：

[-Apr- :: GMT] PHP Warning:  Missing argument  for DrSlump\Protobuf\Codec\Binary::getWireType(), called in /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Codec/Binary.php on line  and defined in /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Codec/Binary.php on line
[-Apr- :: GMT] PHP Stack trace:
[-Apr- :: GMT] PHP   . {main}() /usr/local/services/php-5.4./bin/protoc-gen-php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Compiler\Cli::run() /usr/local/services/php-5.4./bin/protoc-gen-php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Compiler->compile() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Compiler/Cli.php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Message->__construct() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Compiler.php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Message->parse() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Message.php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Codec\Binary->decode() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Message.php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Codec/Binary.php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Codec/Binary.php:
[-Apr- :: GMT] PHP   . DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Codec/Binary.php:
[-Apr- :: GMT] PHP  . DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Codec/Binary.php:
[-Apr- :: GMT] PHP  . DrSlump\Protobuf\Codec\Binary->getWireType() /usr/local/services/php-5.4./lib/php/DrSlump/Protobuf/Codec/Binary.php:

跟入代码发现：/usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php 中的第249行，

$wire = $this->getWireType($type);

参数传递异常。

发现需要传入2个参数，于是修改为：

$wire = $this->getWireType($type, null);

重新执行

protoc-gen-php --out=./ -i. -Dsuffix=.proto.php tutorial.proto

生成成功：tutorial.proto.php

另一种方式：

protoc --plugin=/usr/local/php/bin/protoc-gen-php --php_out=. -I. tutorial.proto

生成成功：tutorial.php

协议已经成功生成。