Taggr canister has no Candid metadata

Developers Rust
1

Hey everyone,

since months we’re struggling with the issue that the Taggr canister has no Candid interface exposed on the IC dashboard.

The dfx.json file has the “name”: “candid:service” values and the did file gets correctly auto-exported. But for some reason it will not get included in the WASM file.

I have not many clues about what the issue is and would appreciate any help. Thanks!

PS: unfortunately I cannot include links here (probably as a new user), but the source-code repo is linked from the main Taggr-link webpage (see footer).

2

Hey there

Assuming you mean this repo: GitHub - TaggrNetwork/Taggr: Decentralized social network and publishing platform.

I just tried it locally and dfx deploy followed by dfx --identity anonymous canister metadata taggr candid:service returns the .did file just fine.

Suspicion: You have a makefile, build.sh, release.sh, and maybe something I overlooked. dfx only adds the metadata if you call dfx build, and the only file that will contain the metadata is in .dfx/<network>/canisters/<canister name>. Is this the file you are grabbing after a build? Or are you using the output of build.sh, which dfx doesn’t touch?

1 Like
3

Thanks so much Severin! We definitely do not use this file as I assumed the Candid metadata is addid using export_candid!() macro call… I will change the release file to export the dfx build and let you know in a few weeks (we have a pipeline of changes) if it worked.

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4

Actually, what you say does not seem to hold for our staging canister which is deployed like this:

  staging_deploy:
      NODE_ENV=production DFX_NETWORK=staging make fe
      FEATURES=staging dfx build
      FEATURES=staging dfx --identity prod deploy --network staging taggr

This is a very simple deployment only using build.sh configured in dfx.json.

Yet, the canister (e4i5g-biaaa-aaaao-ai7ja-cai) has no Candid interface on the IC dashboard…

5

If you want to check locally if the metadata is included:

[unzip file somehow]
ic-wasm <file.wasm> metadata # will show metadata sections
ic-wasm <file.wasm> metadata candid:service # will show the content of that section. candid:service is the one the dashboard and all our tooling uses

Your dfx.json says

            "metadata": [
                {
                    "name": "candid:service",
                    "networks": ["local", "ic"],
                    "visibility": "public"
                }
            ]

If you add "staging" to the networks then I would expect it to show up

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6

You were right! This fixed it and the interface description just appeared for the staging canister!

Now I know what to do for the production release.

Thank you so much, Severin! :pray:

PS: could you please let me know your Taggr nickname if you have one? If not I’ll create an invite for you and then tip you with $TAGGR.

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