How to Resolve Protobuf Import Errors: Can't Find 'google/api/annotations.proto'?

Troubleshooting Protobuf Import Errors: Adding "google/api/annotations.proto" as a Dependency

When following the documentation for setting up a gRPC gateway, users may encounter an import error related to "google/api/annotations.proto." This article provides guidance on how to resolve this dependency issue.

The error occurs when the following line is added to the code:

import "google/api/annotations.proto";

As the documentation mentions, users need to provide the required third-party protobuf files to the "protoc" compiler. However, the specific method for doing so is not explicitly explained. This article aims to clarify the process of adding "google/api/annotations.proto" as a dependency.

Solution:

One approach to solving this issue is to add the required third-party Google APIs and their content to the root directory of the project. This method is considered acceptable by the documentation.

Implementation:

1. Download the Google API protobuf files from the GitHub repository: https://github.com/googleapis/googleapis/tree/main/google/api
2. Unzip the downloaded file and copy the "google/api" directory containing the protobuf files to the root directory of your project.
3. Ensure that you have the "protoc" compiler installed and available in your PATH.
4. Compile your proto files as usual, making sure to include the dependency on the Google APIs:

protoc --proto_path=<path_to_google_api_proto_files> --proto_path=<path_to_my_proto_files> <my_proto_files.proto>

This method will successfully resolve the dependency error and allow you to proceed with the gRPC gateway generation.

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