How is typeName mapped to exact type in implementation?

[Vyom Yadav]

Hi Folks,

Consider the following snippet: (Explicitly doing it in markdown format)

```go

env, err := cel.NewEnv(
cel.Types(&rpcpb.AttributeContext_Request{}),
cel.Variable("request", cel.ObjectType("google.rpc.context.AttributeContext.Request")),
)

```

In the snippet above, we supply `rpcpb.AttributeContext_Request` and `google.rpc.context.AttributeContext.Request`.

Now rpcpb.AttributeContext_Request(google.golang.org/genproto/googleapis/rpc/context/attribute_context)
nowhere contains `google.rpc.context.AttributeContext.Request` as a variable or anything, the package name `google.rpc.context` is present in the .proto file BUT no in the .pb.go file.

`google.rpc.context.AttributeContext.Request` is present as a comment in generated protobuf file.

I am pretty new to this and am keen to know how this mapping from `google.rpc.context.AttributeContext.Request` ->  `rpcpb.AttributeContext_Request` exactly happens.

I would be grateful if you could explain this to me and provide a link to the actual part of code in the implementation.

Thanking You,

Vyom

[Tristan Swadell]

Hi Vyom,

Sorry for the late reply,

The type-name would be the protobuf type name, so proto package `google.rpc.context` and proto type name `AttributeContext.Request`. 

It's the same syntax you would use when referring to a type-name within another proto file.

-Tristan

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