JSON-RPC communication between Native Chain and Meta Chain

[DieHard073055]

What would you like to be added:

JSON-RPC communication between Native Chain and Meta Chain.

This includes creating *.proto definitions on the NativeChain side that auto-generate client code for DMC to call.

Why is this needed:

For the JSON RPC client generator to generate code for the RPC calls.

related

• Add RPCs required at the DMC side #10
• Secured connectivity between Meta Chain and Native Chain #45

PR

DeFiCh/libain-rs#19

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[fuxingloh]

Why protobuf instead of simple JSON-RPC?

[DieHard073055]

@wafflespeanut

Why protobuf instead of simple JSON-RPC?

[wafflespeanut]

Protobuf offers strict typing and aids versioning for various messages used in RPC calls, so we decided to have a protobuf spec which represents the existing JSON RPC implementation and support both gRPC and JSON RPC endpoints (JSON schema is autogenerated from protobuf types and is meant to be backward-compatible). If defid needs to invoke an RPC endpoint, then it's easier to add the protobuf spec and use the generated client code directly (which will provide the necessary types and functions to perform that call). Long-term goal is to segregate the RPC handling (both server and client) out of ain.

[wafflespeanut]

It should be noted that this doesn't change anything in metachain (the incoming RPC request will still be JSON) - it's only a matter of how we decided to go about RPC implementation in ain.

[fuxingloh]

Protobuf offers strict typing and aids versioning for various messages used in RPC calls, so we decided to have a protobuf spec which represents the existing JSON RPC implementation and support both gRPC and JSON RPC endpoints (JSON schema is autogenerated from protobuf types and is meant to be backward-compatible). If defid needs to invoke an RPC endpoint, then it's easier to add the protobuf spec and use the generated client code directly (which will provide the necessary types and functions to perform that call). Long-term goal is to segregate the RPC handling (both server and client) out of ain.

Sounds good! Do we have an integration timeline for this?

[fuxingloh]

It should be noted that this doesn't change anything in metachain (the incoming RPC request will still be JSON) - it's only a matter of how we decided to go about RPC implementation in ain.

For the avoidance of doubt, is this what you mean?

graph LR

nb --JSON RPC---> ma

subgraph DeFiCh/metachain
ma[RPC Server] --> mb[MetaChain Consensus]
end

subgraph DeFiCh/ain
na[NativeChain Consensus]
nb["NativeChain 'RPC Client'"]
nc["*.proto Defintions"]

na --> nb
nb --> nc
end

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[wafflespeanut]

Sounds good! Do we have an integration timeline for this?

As for the protobuf-based RPC client code, the work is already in place, it's just a matter of fixing library linkage on different platforms. Hopefully will be able to merge it today or tomorrow.

For the avoidance of doubt, is this what you mean?

That's accurate.

[fuxingloh]

Sounds good! Do we have an integration timeline for this?

As for the protobuf-based RPC client code, the work is already in place, it's just a matter of fixing library linkage on different platforms. Hopefully will be able to merge it today or tomorrow.

For the avoidance of doubt, is this what you mean?

That's accurate.

Awesome thanks!

[fuxingloh]

/assign @wafflespeanut let me assign this to you since you're working on #106
/area ain meta