Will motoko canister/dfx support protobuf?

flyq · June 13, 2021, 8:59am

I found that ledger canister has some interfaces that use protobuf for canister interface:

dfinity/ic/blob/master/rs/rosetta-api/ledger_canister/src/main.rs#L648

    
      
          /// See caveats of use on send_dfx
          #[export_name = "canister_query account_balance_dfx"]
          fn account_balance_dfx_() {
              over(candid_one, |AccountBalanceArgs { account }| {
                  account_balance(account)
              })
          }
          
          
#[export_name = "canister_query total_supply_pb"]
          fn total_supply_() {
              over(protobuf, |_: TotalSupplyArgs| total_supply())
          }
          
          
/// Get multiple blocks by *offset into the container* (not BlockHeight) and
          /// length. Note that this simply iterates the blocks available in the Ledger
          /// without taking into account the archive. For example, if the ledger contains
          /// blocks with heights [100, 199] then iter_blocks(0, 1) will return the block
          /// with height 100.
          #[export_name = "canister_query iter_blocks_pb"]
          fn iter_blocks_() {
              over(protobuf, |IterBlocksArgs { start, length }| {

I guess this is done for efficiency.

But currently dfx and motoko canister only support candid-based interface calls, and cannot call this protobuf-based interface:

The Replica returned an error: code 4, message: "IC0503: Canister ryjl3-tyaaa-aaaaa-aaaba-cai trapped explicitly: Panicked at 'Deserialization Failed: "failed to decode Protobuf message: unexpected end group tag"', /home/peter/ic/rs/rust_canisters/dfn_core/src/endpoint.rs:34:41"

So will motoko canister/dfx support protobuf?

wang · June 14, 2021, 6:44am

Related: https://twitter.com/floatfloatboat/status/1399955112915726345?s=19

It seems like if you want to integrate the registry from a motoko canister, you’ll have to build protobufs yourself

nomeata · June 14, 2021, 9:59am

Plus Motoko doesn’t even allow you to send “raw” IC messages, i.e. it only talks Candid.

You see, Candid is the official interop language for the Internet Computer, but not the only one. Or something like that…

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Will motoko canister/dfx support protobuf?

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