A proxy canister that can help query the protobuf interfaces of NNS canisters

Developers
1

Hello everyone, because some canister interfaces in NNS use protobuf as the data communication standard, so these interfaces to be unable to use dfx or candid-based canister to directly access.

And exporting the state in NNS is a just-needed:

So I made a tool: A proxy canister that can help query the protobuf interfaces of NNS canisters.

Part of the interface of Ledger canister and registry canister is currently implemented, such as:

  • get balance in Ledger canister:

    dfx canister --no-wallet --network ic call read_rs account_balance_pb '(record {account="073ca335431d6b6f6916068b5784a241730d2e3452ae650025b4bf7a975a81f0"})'
(record { e8s = 47_110_000 : nat64 })

  • get transaction record block in Ledger canister:

    dfx canister --no-wallet --network ic call read_rs block_pb '(507504:nat64)'
(
  record {
    transaction = record {
      memo = 182_884_116_570_714_352 : nat64;
      created_at_time = record {
        timestamp_nanos = 1_630_776_083_125_587_176 : nat64;
      };
      transfer = variant {
        Send = record {
          to = "4dfa940def17f1427ae47378c440f10185867677109a02bc8374fc25b9dee8af";
          fee = record { e8s = 10_000 : nat64 };
          from = "4acd7ec9e1411fd23b2ed84fc173aacd220872408c1ff77a29961ab0f70d6ef6";
          amount = record { e8s = 32_616_390_000 : nat64 };
        }
      };
    };
    timestamp = record { timestamp_nanos = 1_630_776_086_437_763_870 : nat64 };
    parent_hash = opt record {
      inner = blob "\eaJ!\c8\17H\94\89\d8\d0z\e9\a0$.\12\d2\d8\0d?\c4\84\be\f3n\a2\8e\14u\0a\af)";
    };
  },
)
```

  • get the totalSupply in Ledger canister:

    dfx canister --no-wallet --network ic call read_rs total_supply_pb
(record { e8s = 47_278_350_104_315_648 : nat64 })

  • get the latest version in Registry canister:

    dfx canister --no-wallet --network ic call read_rs get_latest_version
(record { version = 17_011 : nat64 })

The canister id is chu2x-jyaaa-aaaah-aaqra-cai, which you can use to replace the read_rs in the command above to call the read_rs canister:

dfx canister --no-wallet --network ic call chu2x-jyaaa-aaaah-aaqra-cai get_latest_version
(record { version = 17_016 : nat64 })

next to do

  • support more protobuf interfaces
  • change update to query after inter canister query calls enabled:
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