Call smart contract method with WalletConnect v1 and ethers.js provider on mobile in Clojure

Question

Here I would like to allow calling a method of my smart contract from a ethers provider that uses WalletConnect.

I proceed as follows to connect a user to WalletConnect :

    (ns my.project
      (:require
        ["@walletconnect/client" :default WalletConnect]
        ["@walletconnect/qrcode-modal" :as QRCodeModal]
        ["ethers" :as ethers]))
    
    (defn create-connector []
        (let [connector (WalletConnect.
                          #js{ "bridge" "https://bridge.walletconnect.org" 
                               "qrcodeModal" QRCodeModal})]
          (-> (.createSession connector)
              (.then
                  #(.on connector "connect" #(my-function connector DATAS))))))

Once the user is connected I launch the my-function method that calls the contract method:

    (defn my-function [connector DATAS]
      (let [{:keys [abi address params]} DATAS
            provider connector
            signer (.getSigner provider)
            contract (ethers/Contract. address abi signer)
            contract (.connect contract signer)]
        (-> (.contract-method contract params)
            (.then
              #(println "SUCCESS CALL.")))))

The connection to the account goes well, I am redirected correctly on my wallet app (Metamask iOS), however at the time of the call to the contract method nothing happens at the level of my mobile wallet application.

I tried another way to create my provider, in this way but without any results either:

    (let [...
          provider (ethers/providers.Web3Provider. connector)
          ...] 
   ...
)

Note that when I try on desktop my call to the method using this provider, it works perfectly, my Metamask extension is well called:

    (let [...
          provider (ethers/providers.Web3Provider. (object/get js/window "ethereum"))
          ...] 
   ...
)

What would be useful here is to be able to retrieve the signature from the walletconnect client.

WalletConnect v1 is going to be disabled in few days, so there is no point building anything against it today. — Mikko Ohtamaa, Apr 13 '23 at 10:30

score 0 · Answer 1 · answered Apr 14 '23 at 09:08

I know nothing about any of the wallet specifics, but in general you should add a .catch to handle promise rejections, aka. failed .contract-method calls.

So, try changing it to this. Maybe that surfaces the actual error.

    (defn my-function [connector DATAS]
      (let [{:keys [abi address params]} DATAS
            provider connector
            signer (.getSigner provider)
            contract (ethers/Contract. address abi signer)
            contract (.connect contract signer)]
        (-> (.contract-method contract params)
            (.then #(println "SUCCESS CALL."))
            (.catch #(println "FAILED CALL." %)))))

Maybe use js/console.log instead of println. That might yield more usable output.

Call smart contract method with WalletConnect v1 and ethers.js provider on mobile in Clojure

1 Answers1