Run ABI Get Method

Run ABI compatible get methods

• Run get method

• Source code

Run get method

With low level SDK get method is executed in 3 steps:

1. Download the latest Account State (BOC)

2. Encode message that calls the method

3. Execute the message locally on the downloaded state:

Here is the sample that executes the get method getTimestamp on the latest account's state.

1. account boc is downloaded with blockchain API

2. message that calls contract's function getTimestamp is encoded with encode_message function

3. message is executed on local TVM with run_tvm method

 async function getAccount(address) {

    // `boc` or bag of cells - native blockchain data layout. Account's boc contains full account state (code and data) that
    // we will  need to execute get methods.
    const query = `
        query {
          blockchain {
            account(
              address: "${address}"
            ) {
               info {
                balance(format: DEC)
                boc
              }
            }
          }
        }`
    const {result}  = await client.net.query({query})
    const info = result.data.blockchain.account.info
    return info
}
async function runGetMethod(methodName, address, accountState) {
    // Execute the get method `getTimestamp` on the latest account's state
    // This can be managed in 3 steps:
    // 1. Download the latest Account State (BOC) 
    // 2. Encode message
    // 3. Execute the message locally on the downloaded state

    // Encode the message with `getTimestamp` call
    const { message } = await client.abi.encode_message({
        // Define contract ABI in the Application
        // See more info about ABI type here:
        // https://github.com/tonlabs/ever-sdk/blob/master/docs/reference/types-and-methods/mod_abi.md#abi
        abi: {
            type: 'Contract',
            value: HelloWallet.abi,
        },
        address,
        call_set: {
            function_name: methodName,
            input: {},
        },
        signer: { type: 'None' },
    });

    // Execute `getTimestamp` get method  (execute the message locally on TVM)
    // See more info about run_tvm method here:
    // https://github.com/tonlabs/ever-sdk/blob/master/docs/reference/types-and-methods/mod_tvm.md#run_tvm
    console.log('Run `getTimestamp` get method');
    const response = await client.tvm.run_tvm({
        message,
        account: accountState,
        abi: {
            type: 'Contract',
            value: HelloWallet.abi,
        },
    });
    return response.decoded.output
}

Source code

https://github.com/tonlabs/sdk-samples/blob/master/core-examples/node-js/hello-wallet/index.js

Check out AppKit documentation for this use case.