Once you have the DynamicMessage, you can use the JsonFormat API the same
way you would use it with ordinary messages.
On Fri, Feb 24, 2023 at 1:52 PM ritesh singh <riteshdvp...@gmail.com> wrote:
> Thanks, any leads on generating json at run time using dynamicMessage. Any
> existing api util if you can point me to.
>
> On Saturday, February 25, 2023 at 2:44:14 AM UTC+5:30 Adam Cozzette wrote:
>
>> I think DynamicMessage is the right approach since you need to work with
>> proto files that are only known at run time. This will also allow you to
>> generate JSON.
>>
>> On Fri, Feb 24, 2023 at 11:19 AM ritesh singh <ritesh...@gmail.com>
>> wrote:
>>
>>>
>>> Or if there's a better different approach instead of relying on
>>> FileDescriptorSet and DynamicMessage - considering i have access to only
>>> .pb (generate by proto-lite) or .proto file.
>>> On Saturday, February 25, 2023 at 12:46:44 AM UTC+5:30 ritesh singh
>>> wrote:
>>>
>>>> Thanks Adam, so basically i am writing an Intellij plugin for Android
>>>> Studio.
>>>> The plugin will just take the .pb file and .proto file, run the protoc
>>>> compiler, generate FileDescriptorSet for proto and create a DynamicMessage
>>>> using generated fileDescriptorSet and .pb.
>>>>
>>>> I was wondering if there a way to generate the json schema, as in
>>>> key-value pair. As we know, lite version doesn't include fileds, is it
>>>> possible to do it at run-time, as in extract keys in any phase?
>>>>
>>>> On Saturday, February 25, 2023 at 12:30:54 AM UTC+5:30 Adam Cozzette
>>>> wrote:
>>>>
>>>>> A serialized protocol buffer doesn't include any type information, so
>>>>> before you can parse one you have to know in advance which type you're
>>>>> expecting. If you want to be prepared to accept either A or B, then a good
>>>>> solution is to put both types inside a oneof in a parent message, and then
>>>>> just parse the parent message normally.
>>>>>
>>>>> It doesn't matter which protobuf implementation created the .pb file,
>>>>> since all implementations use the same wire format.
>>>>>
>>>>> That is true that the Java lite implementation doesn't support
>>>>> reflection and doesn't include descriptors, so it cannot serialize protos
>>>>> to JSON. If you can stick to the binary format then that would be ideal
>>>>> since that format is useable everywhere.
>>>>>
>>>>> On Thu, Feb 23, 2023 at 5:33 PM ritesh singh <ritesh...@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Also does it matter if .pb was created using proto lite and android
>>>>>> end.
>>>>>>
>>>>>> I believe the lite version doesn't store fields, so converting it to
>>>>>> json using proto-util won't work and i need to make use of reflection.
>>>>>>
>>>>>> On Fri, 24 Feb, 2023, 6:54 am ritesh singh, <ritesh...@gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Thanks Adam. I will give it a shot. I thought of using *protoc*
>>>>>>> compiler, but what if my proto file contains nested messages
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> *message A { B b = 1}*
>>>>>>> *message B {*
>>>>>>> *}*
>>>>>>>
>>>>>>>
>>>>>>> After running *protoc *on the proto file, it will generate 2 java
>>>>>>> classes. I won't know which generated class to use against my .pb file,
>>>>>>> as
>>>>>>> my plugin is only aware of .pb and .proto file.
>>>>>>>
>>>>>>> Please correct me, if am wrong.
>>>>>>> On Friday, February 24, 2023 at 6:42:05 AM UTC+5:30 Adam Cozzette
>>>>>>> wrote:
>>>>>>>
>>>>>>>> I suspect that your code is getting an error because it's trying to
>>>>>>>> parse a .proto file as a serialized protocol buffer. (This won't work
>>>>>>>> since
>>>>>>>> .proto files use a text representation very different from the standard
>>>>>>>> protobuf binary format.) Probably the best way to fix this problem
>>>>>>>> would be
>>>>>>>> to invoke protoc with --descriptor_set_out to parse the proto file and
>>>>>>>> convert it into a serialized FileDescriptorSet. A FileDescriptorSet is
>>>>>>>> just
>>>>>>>> a protocol buffer, so once you have it in that form you can easily
>>>>>>>> parse it
>>>>>>>> like you would parse any other serialized proto.
>>>>>>>>
>>>>>>>> On Thu, Feb 23, 2023 at 4:59 PM ritesh singh <ritesh...@gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>> Hello,
>>>>>>>>>
>>>>>>>>> I am working on creating a Android Studio plugin for proto data
>>>>>>>>> store.
>>>>>>>>> Android uses proto-lite, my current approach, i get the .pb file
>>>>>>>>> and .proto file and use the same in intellij plugin to deserialise it.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> *val psiFile = PsiManager.getInstance(project).findFile(protoFile)
>>>>>>>>> val protoFileContent = psiFile!!.text val fileDescriptorProto:
>>>>>>>>> DescriptorProtos.FileDescriptorProto =
>>>>>>>>> DescriptorProtos.FileDescriptorProto.parseFrom(protoFileContent.byteInputStream())
>>>>>>>>> val fileDescriptor =
>>>>>>>>> Descriptors.FileDescriptor.buildFrom(fileDescriptorProto,
>>>>>>>>> arrayOfNulls(0))
>>>>>>>>> val messageDescriptor = fileDescriptor.messageTypes[0] val buffer =
>>>>>>>>> pbFile.contentsToByteArray() val messageBuilder:
>>>>>>>>> DynamicMessage.Builder =
>>>>>>>>> DynamicMessage.newBuilder(messageDescriptor)
>>>>>>>>> messageBuilder.mergeFrom(buffer) val message = messageBuilder.build()
>>>>>>>>> val
>>>>>>>>> text: String = TextFormat.printToString(message)*
>>>>>>>>>
>>>>>>>>> Above code is throwing error in parsing step,* Protocol message
>>>>>>>>> tag had invalid wire type.*
>>>>>>>>>
>>>>>>>>> Thanks in advance.
>>>>>>>>>
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>>>>>>>>>
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