Feature: Download canister .did and .most

[vporton]

Please add a command to download canister's .did and .most.

Currently I do my code hacky:

%.install: %.wasm FORCE
    dfx canister create $(*F)
    dfx canister install --network=$(NETWORK) -m install --wasm=$< $(*F)

%.upgrade: %.wasm %.most FORCE
    mkdir -p $(DFXDIR)/.dfx/local/canisters/$(*F)
    cp -f $*.most $(DFXDIR)/.dfx/local/canisters/$(*F)/ # hack!
    cp -f $*.did $(DFXDIR)/.dfx/local/canisters/$(*F)/constructor.did # hack!
    dfx canister install --network=$(NETWORK) -m upgrade --wasm=$< $(*F)

I want to use moc --stable-compatible explicitly to avoid hacks, what is possible only when I get direct access to such canister data.

[chenyan-dfinity]

To get it from deployed canisters: dfx canister metadata <canister_id> motoko:stable-types. To get it from wasm: ic-wasm <my.wasm> metadata motoko:stable-types.

If you want to make it everything explicit and scriptable, I encourage you to try ic-repl.

[vporton]

OK, dfx canister metadata <canister_id> motoko:stable-types gives .did. But how to get .most? (And I don't really understand what is the distinction between .did and .most.)

Also, the following demonstrates that stresser does have main shared method, but it is missing in the actor:

$ dfx canister metadata stresser motoko:stable-types && dfx canister call stresser main '()'
// Version: 1.0.0
actor {

};
Error: Failed update call.
Caused by: Failed update call.
  The replica returned a replica error: reject code CanisterReject, reject message IC0501: Canister bkyz2-fmaaa-aaaaa-qaaaq-cai is out of cycles, error code None

$ dfx --version
dfx 0.18.0

[chenyan-dfinity]

motoko:stable-types gives you .most. candid:service gives you .did

[lwshang]

This doesn't seem to be an issue with Rust CDK but rather with general development using dfx.