[apache/incubator-teaclave] Support grpc (Issue #668)

[GeminiCarrie <no...@github.com.INVALID>]

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### Motivation & problem statement
The rpc used by Teaclave is not universal and does not support async.

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### Proposed solution

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Replace current rpc with grpc (e.g. Tonic).

I noticed that there is an example based on tonic and tokio in rust-sgx-sdk.

https://github.com/apache/incubator-teaclave-sgx-sdk/tree/v2.0.0-preview/samplecode/rpc

Tonic supports  async/await and has a high performance.

To do mutual attestation, we can establish trusted gRPC channel through attested TLS.

Grpc based on tonic, rustls and tokio is easier to maintain, and has better compatibility and performance.


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Re: [apache/incubator-teaclave] Support grpc (Issue #668)

[He Sun <no...@github.com.INVALID>]

Closed #668 as completed.

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