jhump/goprotoc

Library for writing protoc plugins in Go; also includes a pure-Go protoc replacement

Go-protoc

This repo makes it easy to work in the protobuf tool chain using Go.

Writing Plugins for protoc

First and foremost, the included plugins package makes it easy to implement protoc plugins in Go. It defines an interface that plugins implement as well as facilities to actually integrate with protoc (e.g. implementing the proper plugin protocol). It also provides "name resolution" logic: computing qualified names in Go source code for elements in proto descriptors. This makes it a snap to write plugins in Go that generate additional Go code from your proto sources.

Pure Go version of protoc

This repo also contains a pure-Go re-implementation of protoc. This new version of protoc, named goprotoc (of course!), will delegate to a protoc executable on the path, driving it as if it were a plugin, for generating C++, C#, Objective-C, Java, JavaScript, Python, PHP, and Ruby code (since they are implemented in protoc itself). But it provides descriptors to protoc, parsed by goprotoc, instead of having protoc re-parse all of the source code. And it can invoke any other plugins (such as protoc-gen-go) the same way that protoc would.

In addition to the goprotoc command, this repo provides a package that other Go programs can use as the entry-point to running Protocol Buffer code gen, without having to shell out to an external program.

Extras

You'll also find a protoc plugin named protoc-gen-gox that can be the entry point for generating Go code. It will delegate to protoc-gen-go for standard code gen and gRPC code gen, but it can also be configured to execute other plugins that emit additional Go code. It's sort of like a plugin multiplexer that supports a configuration file for enabling and configuring the various plugins that it invokes.

goprotoc's Issues

opts.pluginDefs is always nil, panics when using --plugin

I'm trying to use --plugin, but doing so breaks, as opts.pluginDefs is always nil, and never an allocated map.

panic: assignment to entry in nil map

goroutine 1 [running]:
github.com/jhump/goprotoc/app/goprotoc.parseFlags(0x0, 0x0, 0x7ffcc6e22009, 0x8, 0xc0000101f0, 0x5, 0x5, 0x7f7380, 0xc00000e018, 0xc000041e08, ...)
	/home/jake/go/pkg/mod/github.com/jhump/[email protected]/app/goprotoc/options.go:174 +0x13b5
github.com/jhump/goprotoc/app/goprotoc.run(0xc0000101e0, 0x6, 0x6, 0x7f7360, 0xc00000e010, 0x7f7380, 0xc00000e018, 0x7f7380, 0xc00000e020, 0xc000073a01, ...)
	/home/jake/go/pkg/mod/github.com/jhump/[email protected]/app/goprotoc/goprotoc.go:48 +0x157
github.com/jhump/goprotoc/app/goprotoc.Run(0xc0000101e0, 0x6, 0x6, 0x7f7360, 0xc00000e010, 0x7f7380, 0xc00000e018, 0x7f7380, 0xc00000e020, 0x6d1df7)
	/home/jake/go/pkg/mod/github.com/jhump/[email protected]/app/goprotoc/goprotoc.go:35 +0x97
github.com/jhump/goprotoc/app/goprotoc.Main()
	/home/jake/go/pkg/mod/github.com/jhump/[email protected]/app/goprotoc/goprotoc.go:30 +0x8a
main.main()
	/home/jake/go/pkg/mod/github.com/jhump/[email protected]/cmd/goprotoc/goprotoc.go:22 +0x20

Recommendation: add disclaimer regarding using this to implement protoc plugins

Howdy, what's the status of this project?

I ask as, in the process of attempting to implement a protoc plugin (a while ago - I've kinda forgotten the details), I ran into significant issues with the name (and maybe type, I don't remember unfortunately) resolution, provided by this module.

I believe that the core problem was in the general vicinity of

goprotoc/plugins/names.go

Line 20 in 70c8197

type GoNames struct {

, and related to the generated field name resolution not being 1-1 with the protoc-gen-go implementation. I'd imagine it'd be possible to trigger at least similar issues if there are fields which collide with generated getters.

Anyway, you're probably aware that google.golang.org/protobuf/compiler/protogen is a thing, nowadays. IMO it would be best to advertise the official protogen package in the readme of this package, particularly due to #37 .

This project seems kinda like a connector for https://github.com/jhump/gopoet , which I did end up using, and quite liked. It did what I needed and was easy to understand and use. It's just something I slapped together, but I've implemented a vaguely similar type cache myself, connecting gopoet and the official protogen packages (I don't mean that as a self plug, just a FYI).

mentioned above: https://github.com/joeycumines/gopoet-protogen
example usage of the above module: https://github.com/joeycumines/protoc-gen-go-copy

goprotoc does not correctly generate a ZIP or JAR file when that is given as output location

If I give an output location that is a ZIP or JAR file, goprotoc instead just creates files in the parent directory of the expected location.

Dependency management needed for testing when Golang Modules not used

Right now, when Golang Modules are not used in testing, the latest version of each dependency is pulled, not a specific version. This is going to cause breakages with tests at some point, and also makes it difficult for users who do not use Golang Modules to know what versions of dependencies to use.

This probably just means setting up https://github.com/golang/dep so this repository has a Gopkg.toml and Gopkg.lock.

Plugins Usage Example

The plugins package has some decent documentation, but I can't tell how it's actually intended to be used. Could you create an example, perhaps in plugins/README.md?

As an idea, what if I wanted to codegen a copy of the structs created by protoc-gen-go, but with different struct tags? How would that look? I get a little taste of it from the docs but I feel like I'm missing a lot of context.

Finish the goprotoc command

The plugins package is fairly complete (though could likely use more tests). But the goprotoc command is unfinished and hasn't been touched in a while. This issue is just a reminder to myself to finish it.

This command was referenced recently in a protoc proposal to supply an alternative CLI written in Go.

While looking around, I found a similar project that appears to have been started 5 years ago and then never finished either: https://github.com/dropbox/goprotoc

Since the dropbox one appears to be abandon-ware, this repo could be a reasonable home for an open-source fork of protoc that is an all-Go alternative.

How to get extend options of a message?

Hi, sometimes we need to defined some extend options, but it seems that goprotoc does not expose any interface for us to get our options. For example, here is my .proto file:

syntax = "proto3";

import "google/protobuf/descriptor.proto";

extend google.protobuf.MessageOptions {
    string my_option = 51234;
}

message A {
    option (my_option) = "Hello world!";
}

If I print out the message options in the example callback, like this:

func doCodeGen(req *plugins.CodeGenRequest, rsp *plugins.CodeGenResponse) error {
    fmt.Println(req.Files[0].GetMessageTypes()[0].GetMessageOptions())
}

I will get these output in console:

51234:"Hello world!" 

It seems that user defined options is recorded in some map, but there is no way for me to get the option my_option by myself. By the way, I tried to find the option by GetUninterpretedOption method, but the following code returns 0.

len(req.Files[0].GetMessageTypes()[0].GetMessageOptions().GetUninterpretedOption())

Different FileDescriptorProto ordering when --include_imports not set

This used goprotoc and protoc to compare.

Package: https://github.com/googleapis/googleapis/tree/master/google/cloud/vision/v1p4beta1
Effective command (run from root of googleapis): [protoc,goprotoc] -I . google/cloud/vision/v1p4beta1/*;proto

The issue is the ordering of the FileDescriptorProtos when --include_imports is not set.

protoc order:

"google/cloud/vision/v1p4beta1/geometry.proto"
"google/cloud/vision/v1p4beta1/product_search_service.proto"
"google/cloud/vision/v1p4beta1/product_search.proto"
"google/cloud/vision/v1p4beta1/text_annotation.proto"
"google/cloud/vision/v1p4beta1/web_detection.proto"
"google/cloud/vision/v1p4beta1/image_annotator.proto"

goprotoc order:

"google/cloud/vision/v1p4beta1/geometry.proto"
"google/cloud/vision/v1p4beta1/image_annotator.proto"
"google/cloud/vision/v1p4beta1/product_search.proto"
"google/cloud/vision/v1p4beta1/product_search_service.proto"
"google/cloud/vision/v1p4beta1/text_annotation.proto"
"google/cloud/vision/v1p4beta1/web_detection.proto"

protoc FileDescriptorSet JSON dump:

{
  "file": [
    {
      "name": "google/cloud/vision/v1p4beta1/geometry.proto",
      "package": "google.cloud.vision.v1p4beta1",
      "dependency": [
        "google/api/annotations.proto"
      ],
      "messageType": [
        {
          "name": "Vertex",
          "field": [
            {
              "name": "x",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "x"
            },
            {
              "name": "y",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "y"
            }
          ]
        },
        {
          "name": "NormalizedVertex",
          "field": [
            {
              "name": "x",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_FLOAT",
              "jsonName": "x"
            },
            {
              "name": "y",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_FLOAT",
              "jsonName": "y"
            }
          ]
        },
        {
          "name": "BoundingPoly",
          "field": [
            {
              "name": "vertices",
              "number": 1,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.Vertex",
              "jsonName": "vertices"
            },
            {
              "name": "normalized_vertices",
              "number": 2,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.NormalizedVertex",
              "jsonName": "normalizedVertices"
            }
          ]
        },
        {
          "name": "Position",
          "field": [
            {
              "name": "x",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_FLOAT",
              "jsonName": "x"
            },
            {
              "name": "y",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_FLOAT",
              "jsonName": "y"
            },
            {
              "name": "z",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_FLOAT",
              "jsonName": "z"
            }
          ]
        }
      ],
      "options": {
        "javaPackage": "com.google.cloud.vision.v1p4beta1",
        "javaOuterClassname": "GeometryProto",
        "javaMultipleFiles": true,
        "goPackage": "google.golang.org/genproto/googleapis/cloud/vision/v1p4beta1;vision",
        "ccEnableArenas": true,
        "objcClassPrefix": "GCVN"
      },
      "syntax": "proto3"
    },
    {
      "name": "google/cloud/vision/v1p4beta1/product_search_service.proto",
      "package": "google.cloud.vision.v1p4beta1",
      "dependency": [
        "google/api/annotations.proto",
        "google/cloud/vision/v1p4beta1/geometry.proto",
        "google/longrunning/operations.proto",
        "google/protobuf/empty.proto",
        "google/protobuf/field_mask.proto",
        "google/protobuf/timestamp.proto",
        "google/rpc/status.proto"
      ],
      "messageType": [
        {
          "name": "Product",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            },
            {
              "name": "display_name",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "displayName"
            },
            {
              "name": "description",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "description"
            },
            {
              "name": "product_category",
              "number": 4,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "productCategory"
            },
            {
              "name": "product_labels",
              "number": 5,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.Product.KeyValue",
              "jsonName": "productLabels"
            }
          ],
          "nestedType": [
            {
              "name": "KeyValue",
              "field": [
                {
                  "name": "key",
                  "number": 1,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "key"
                },
                {
                  "name": "value",
                  "number": 2,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "value"
                }
              ]
            }
          ]
        },
        {
          "name": "ProductSet",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            },
            {
              "name": "display_name",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "displayName"
            },
            {
              "name": "index_time",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.protobuf.Timestamp",
              "jsonName": "indexTime"
            },
            {
              "name": "index_error",
              "number": 4,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.rpc.Status",
              "jsonName": "indexError"
            }
          ]
        },
        {
          "name": "ReferenceImage",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            },
            {
              "name": "uri",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "uri"
            },
            {
              "name": "bounding_polys",
              "number": 3,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.BoundingPoly",
              "jsonName": "boundingPolys"
            }
          ]
        },
        {
          "name": "CreateProductRequest",
          "field": [
            {
              "name": "parent",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "parent"
            },
            {
              "name": "product",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.Product",
              "jsonName": "product"
            },
            {
              "name": "product_id",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "productId"
            }
          ]
        },
        {
          "name": "ListProductsRequest",
          "field": [
            {
              "name": "parent",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "parent"
            },
            {
              "name": "page_size",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "pageSize"
            },
            {
              "name": "page_token",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "pageToken"
            }
          ]
        },
        {
          "name": "ListProductsResponse",
          "field": [
            {
              "name": "products",
              "number": 1,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.Product",
              "jsonName": "products"
            },
            {
              "name": "next_page_token",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "nextPageToken"
            }
          ]
        },
        {
          "name": "GetProductRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            }
          ]
        },
        {
          "name": "UpdateProductRequest",
          "field": [
            {
              "name": "product",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.Product",
              "jsonName": "product"
            },
            {
              "name": "update_mask",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.protobuf.FieldMask",
              "jsonName": "updateMask"
            }
          ]
        },
        {
          "name": "DeleteProductRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            }
          ]
        },
        {
          "name": "CreateProductSetRequest",
          "field": [
            {
              "name": "parent",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "parent"
            },
            {
              "name": "product_set",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.ProductSet",
              "jsonName": "productSet"
            },
            {
              "name": "product_set_id",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "productSetId"
            }
          ]
        },
        {
          "name": "ListProductSetsRequest",
          "field": [
            {
              "name": "parent",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "parent"
            },
            {
              "name": "page_size",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "pageSize"
            },
            {
              "name": "page_token",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "pageToken"
            }
          ]
        },
        {
          "name": "ListProductSetsResponse",
          "field": [
            {
              "name": "product_sets",
              "number": 1,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.ProductSet",
              "jsonName": "productSets"
            },
            {
              "name": "next_page_token",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "nextPageToken"
            }
          ]
        },
        {
          "name": "GetProductSetRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            }
          ]
        },
        {
          "name": "UpdateProductSetRequest",
          "field": [
            {
              "name": "product_set",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.ProductSet",
              "jsonName": "productSet"
            },
            {
              "name": "update_mask",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.protobuf.FieldMask",
              "jsonName": "updateMask"
            }
          ]
        },
        {
          "name": "DeleteProductSetRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            }
          ]
        },
        {
          "name": "CreateReferenceImageRequest",
          "field": [
            {
              "name": "parent",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "parent"
            },
            {
              "name": "reference_image",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.ReferenceImage",
              "jsonName": "referenceImage"
            },
            {
              "name": "reference_image_id",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "referenceImageId"
            }
          ]
        },
        {
          "name": "ListReferenceImagesRequest",
          "field": [
            {
              "name": "parent",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "parent"
            },
            {
              "name": "page_size",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "pageSize"
            },
            {
              "name": "page_token",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "pageToken"
            }
          ]
        },
        {
          "name": "ListReferenceImagesResponse",
          "field": [
            {
              "name": "reference_images",
              "number": 1,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.ReferenceImage",
              "jsonName": "referenceImages"
            },
            {
              "name": "page_size",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "pageSize"
            },
            {
              "name": "next_page_token",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "nextPageToken"
            }
          ]
        },
        {
          "name": "GetReferenceImageRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            }
          ]
        },
        {
          "name": "DeleteReferenceImageRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            }
          ]
        },
        {
          "name": "AddProductToProductSetRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            },
            {
              "name": "product",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "product"
            }
          ]
        },
        {
          "name": "RemoveProductFromProductSetRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            },
            {
              "name": "product",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "product"
            }
          ]
        },
        {
          "name": "ListProductsInProductSetRequest",
          "field": [
            {
              "name": "name",
              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "name"
            },
            {
              "name": "page_size",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "pageSize"
            },
            {
              "name": "page_token",
              "number": 3,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "pageToken"
            }
          ]
        },
        {
          "name": "ListProductsInProductSetResponse",
          "field": [
            {
              "name": "products",
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        {
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            {
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            {
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            {
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            {
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              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
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              "jsonName": "productSearchResults"
            },
            {
              "name": "error",
              "number": 9,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.rpc.Status",
              "jsonName": "error"
            },
            {
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            {
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          ]
        },
        {
          "name": "InputConfig",
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            {
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              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.GcsSource",
              "jsonName": "gcsSource"
            },
            {
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          ]
        },
        {
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              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.GcsDestination",
              "jsonName": "gcsDestination"
            },
            {
              "name": "batch_size",
              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
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        },
        {
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        {
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        },
        {
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              "jsonName": "state"
            },
            {
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              "number": 5,
              "label": "LABEL_OPTIONAL",
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              "jsonName": "createTime"
            },
            {
              "name": "update_time",
              "number": 6,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.protobuf.Timestamp",
              "jsonName": "updateTime"
            }
          ],
          "enumType": [
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              "value": [
                {
                  "name": "STATE_UNSPECIFIED",
                  "number": 0
                },
                {
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                  "number": 1
                },
                {
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                },
                {
                  "name": "DONE",
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                },
                {
                  "name": "CANCELLED",
                  "number": 4
                }
              ]
            }
          ]
        }
      ],
      "enumType": [
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          "value": [
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              "name": "UNKNOWN",
              "number": 0
            },
            {
              "name": "VERY_UNLIKELY",
              "number": 1
            },
            {
              "name": "UNLIKELY",
              "number": 2
            },
            {
              "name": "POSSIBLE",
              "number": 3
            },
            {
              "name": "LIKELY",
              "number": 4
            },
            {
              "name": "VERY_LIKELY",
              "number": 5
            }
          ]
        }
      ],
      "service": [
        {
          "name": "ImageAnnotator",
          "method": [
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              "name": "BatchAnnotateImages",
              "inputType": ".google.cloud.vision.v1p4beta1.BatchAnnotateImagesRequest",
              "outputType": ".google.cloud.vision.v1p4beta1.BatchAnnotateImagesResponse",
              "options": {

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            },
            {
              "name": "BatchAnnotateFiles",
              "inputType": ".google.cloud.vision.v1p4beta1.BatchAnnotateFilesRequest",
              "outputType": ".google.cloud.vision.v1p4beta1.BatchAnnotateFilesResponse",
              "options": {

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            },
            {
              "name": "AsyncBatchAnnotateImages",
              "inputType": ".google.cloud.vision.v1p4beta1.AsyncBatchAnnotateImagesRequest",
              "outputType": ".google.longrunning.Operation",
              "options": {

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            },
            {
              "name": "AsyncBatchAnnotateFiles",
              "inputType": ".google.cloud.vision.v1p4beta1.AsyncBatchAnnotateFilesRequest",
              "outputType": ".google.longrunning.Operation",
              "options": {

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            }
          ]
        }
      ],
      "options": {
        "javaPackage": "com.google.cloud.vision.v1p4beta1",
        "javaOuterClassname": "ImageAnnotatorProto",
        "javaMultipleFiles": true,
        "goPackage": "google.golang.org/genproto/googleapis/cloud/vision/v1p4beta1;vision",
        "ccEnableArenas": true,
        "objcClassPrefix": "GCVN"
      },
      "syntax": "proto3"
    }
  ]
}

goprotoc FileDescriptorSet JSON dump:

{
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      "messageType": [
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              "label": "LABEL_OPTIONAL",
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              "jsonName": "y"
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        {
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              "jsonName": "x"
            },
            {
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              "label": "LABEL_OPTIONAL",
              "type": "TYPE_FLOAT",
              "jsonName": "y"
            }
          ]
        },
        {
          "name": "BoundingPoly",
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              "number": 1,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.Vertex",
              "jsonName": "vertices"
            },
            {
              "name": "normalized_vertices",
              "number": 2,
              "label": "LABEL_REPEATED",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.NormalizedVertex",
              "jsonName": "normalizedVertices"
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          ]
        },
        {
          "name": "Position",
          "field": [
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              "name": "x",
              "number": 1,
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            },
            {
              "name": "y",
              "number": 2,
              "label": "LABEL_OPTIONAL",
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              "jsonName": "y"
            },
            {
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            }
          ]
        }
      ],
      "options": {
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        "javaOuterClassname": "GeometryProto",
        "javaMultipleFiles": true,
        "goPackage": "google.golang.org/genproto/googleapis/cloud/vision/v1p4beta1;vision",
        "ccEnableArenas": true,
        "objcClassPrefix": "GCVN"
      },
      "syntax": "proto3"
    },
    {
      "name": "google/cloud/vision/v1p4beta1/image_annotator.proto",
      "package": "google.cloud.vision.v1p4beta1",
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        "google/cloud/vision/v1p4beta1/geometry.proto",
        "google/cloud/vision/v1p4beta1/product_search.proto",
        "google/cloud/vision/v1p4beta1/text_annotation.proto",
        "google/cloud/vision/v1p4beta1/web_detection.proto",
        "google/longrunning/operations.proto",
        "google/protobuf/field_mask.proto",
        "google/protobuf/timestamp.proto",
        "google/rpc/status.proto",
        "google/type/color.proto",
        "google/type/latlng.proto"
      ],
      "messageType": [
        {
          "name": "Feature",
          "field": [
            {
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              "number": 1,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_ENUM",
              "typeName": ".google.cloud.vision.v1p4beta1.Feature.Type",
              "jsonName": "type"
            },
            {
              "name": "max_results",
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              "label": "LABEL_OPTIONAL",
              "type": "TYPE_INT32",
              "jsonName": "maxResults"
            },
            {
              "name": "model",
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              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "model"
            }
          ],
          "enumType": [
            {
              "name": "Type",
              "value": [
                {
                  "name": "TYPE_UNSPECIFIED",
                  "number": 0
                },
                {
                  "name": "FACE_DETECTION",
                  "number": 1
                },
                {
                  "name": "LANDMARK_DETECTION",
                  "number": 2
                },
                {
                  "name": "LOGO_DETECTION",
                  "number": 3
                },
                {
                  "name": "LABEL_DETECTION",
                  "number": 4
                },
                {
                  "name": "TEXT_DETECTION",
                  "number": 5
                },
                {
                  "name": "DOCUMENT_TEXT_DETECTION",
                  "number": 11
                },
                {
                  "name": "SAFE_SEARCH_DETECTION",
                  "number": 6
                },
                {
                  "name": "IMAGE_PROPERTIES",
                  "number": 7
                },
                {
                  "name": "CROP_HINTS",
                  "number": 9
                },
                {
                  "name": "WEB_DETECTION",
                  "number": 10
                },
                {
                  "name": "PRODUCT_SEARCH",
                  "number": 12
                },
                {
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                  "number": 19
                }
              ]
            }
          ]
        },
        {
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              "jsonName": "gcsImageUri"
            },
            {
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              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_STRING",
              "jsonName": "imageUri"
            }
          ]
        },
        {
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              "jsonName": "content"
            },
            {
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              "number": 2,
              "label": "LABEL_OPTIONAL",
              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.ImageSource",
              "jsonName": "source"
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          ]
        },
        {
          "name": "FaceAnnotation",
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              "type": "TYPE_MESSAGE",
              "typeName": ".google.cloud.vision.v1p4beta1.BoundingPoly",
              "jsonName": "boundingPoly"
            },
            {
              "name": "fd_bounding_poly",
              "number": 2,
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                  "name": "score",
                  "number": 2,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_FLOAT",
                  "jsonName": "score"
                },
                {
                  "name": "description",
                  "number": 3,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "description"
                }
              ]
            },
            {
              "name": "WebImage",
              "field": [
                {
                  "name": "url",
                  "number": 1,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "url"
                },
                {
                  "name": "score",
                  "number": 2,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_FLOAT",
                  "jsonName": "score"
                }
              ]
            },
            {
              "name": "WebLabel",
              "field": [
                {
                  "name": "label",
                  "number": 1,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "label"
                },
                {
                  "name": "language_code",
                  "number": 2,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "languageCode"
                }
              ]
            },
            {
              "name": "WebPage",
              "field": [
                {
                  "name": "url",
                  "number": 1,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "url"
                },
                {
                  "name": "score",
                  "number": 2,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_FLOAT",
                  "jsonName": "score"
                },
                {
                  "name": "page_title",
                  "number": 3,
                  "label": "LABEL_OPTIONAL",
                  "type": "TYPE_STRING",
                  "jsonName": "pageTitle"
                },
                {
                  "name": "full_matching_images",
                  "number": 4,
                  "label": "LABEL_REPEATED",
                  "type": "TYPE_MESSAGE",
                  "typeName": ".google.cloud.vision.v1p4beta1.WebDetection.WebImage",
                  "jsonName": "fullMatchingImages"
                },
                {
                  "name": "partial_matching_images",
                  "number": 5,
                  "label": "LABEL_REPEATED",
                  "type": "TYPE_MESSAGE",
                  "typeName": ".google.cloud.vision.v1p4beta1.WebDetection.WebImage",
                  "jsonName": "partialMatchingImages"
                }
              ]
            }
          ]
        }
      ],
      "options": {
        "javaPackage": "com.google.cloud.vision.v1p4beta1",
        "javaOuterClassname": "WebDetectionProto",
        "javaMultipleFiles": true,
        "goPackage": "google.golang.org/genproto/googleapis/cloud/vision/v1p4beta1;vision",
        "ccEnableArenas": true,
        "objcClassPrefix": "GCVN"
      },
      "syntax": "proto3"
    }
  ]
}

Support `--*_opt` flags, as additional way to pass arguments to plugins

This syntax is supported by protoc so should also be supported by goprotoc.