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Fix wrong error code when subscribing to a non-existing path #586

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merged 1 commit into from
Jul 3, 2023
Merged

Fix wrong error code when subscribing to a non-existing path #586

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11 changes: 9 additions & 2 deletions kuksa_databroker/databroker/src/grpc/kuksa_val_v1/val.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ use tracing::debug;

use crate::broker;
use crate::broker::ReadError;
use crate::broker::SubscriptionError;
use crate::permissions::Permissions;

#[tonic::async_trait]
Expand Down Expand Up @@ -326,10 +327,16 @@ impl proto::val_server::Val for broker::DataBroker {
let stream = convert_to_proto_stream(stream);
Ok(tonic::Response::new(Box::pin(stream)))
}
Err(e) => Err(tonic::Status::new(
Err(SubscriptionError::NotFound) => {
Err(tonic::Status::new(tonic::Code::NotFound, "Path not found"))
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Couldn't you use

Err(ReadError::NotFound) => {
                        errors.push(proto::DataEntryError {
                            path: request.path,
                            error: Some(proto::Error {
                                code: 404,
                                reason: "not_found".to_owned(),
                                message: "Path not found".to_owned(),
                            }),
                        });
                    }

and exchange ReadError::NotFound with SubscriptionError::NotFound Not an expert but what I think could be done. But as erik mentioned we need to agree which error codes we want. Personally I like the 404 and so on better. But I can see that grpc codes could be good for debugging and more understanding the error without having a look to deep in the code.

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For other methods like 'get,' it would be feasible as you suggest because the proto response contains a 'proto::DataEntryError' vector. However, in the case of the subscribe method, it is not possible because the response does not contain such a field and any similar proto error.
I also agree with you and Erik; I prefer using 404 and making improvements in the error information. However, with the current proto schema, it is not possible to fix it in any other way.

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It is part of the bigger decision - do we prefer to use gRPC error codes or our own. Even if we would define our own error solution in proto files (like we partially have today) clients would anyway need to check the gRPC error code first, as there are a lot of error codes that can be generated by the framework (see https://grpc.github.io/grpc/core/md_doc_statuscodes.html) which we cannot control

}
Err(SubscriptionError::InvalidInput) => Err(tonic::Status::new(
tonic::Code::InvalidArgument,
format!("{e:?}"),
"Invalid Argument",
)),
Err(SubscriptionError::InternalError) => {
Err(tonic::Status::new(tonic::Code::Internal, "Internal Error"))
}
}
}

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