Why Does Importing Proto Files from Different Packages Lead to a \"Missing Method Protoreflect\" Error in Go?

Importing proto files from different packages causes 'missing method protoreflect'

Problem

I recently created a package in my Go project to manage all of my .proto files. I moved all of my .proto files to the new package and imported it into another package where I wanted to use them. However, when I tried to use proto.Unmarshal in the other package, I received the following error:

var sensorData *prototemps.Sensor
cannot use sensorData (variable of type *prototemps.Sensor) as protoreflect.ProtoMessage value in argument to proto.Unmarshal: missing method ProtoReflect

Solution

The error message indicates that the type *prototemps.Sensor does not implement the ProtoReflect method. This method is required by proto.Unmarshal to unmarshal the binary data into the target message.

To fix this issue, I needed to import the correct package that contains the ProtoReflect method for the *prototemps.Sensor type. There are two options for this:

1. Import the package "github.com/golang/protobuf/proto".
2. Import the package "google.golang.org/protobuf/proto".

Once I updated the import statement, the error was resolved and I was able to successfully use proto.Unmarshal to parse the binary data.

Updated .go File (Reader Package)

<code class="go">package reader

import (
    "github.com/golang/protobuf/proto" // Import the correct package containing ProtoReflect

    prototemps "github.com/your-org/your-repo/prototemps" // Import the prototemps package containing the Sensor
)

func main() {
    sensorData := &prototemps.Sensor{}
    err := proto.Unmarshal(msg.Payload(), sensorData) 
    if err != nil {
        // Handle error
    }
}</code>

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