Solana: Example test doesn’t work
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February 13, 2025
Here’s an article with a solution on how to call the getFeeForMessage RPC function in Solana using Web3.js@2.
Getting Started
To use the getFeeForMessage RPC function, you’ll need to have installed and configured Web3.js@2. Here are some steps to get started:
- Install Web3.js@2:
npm install web3 @web3/solidity-abi-transformer solana
- Initialize the Web3 provider:
const Web3 = require("web3");
const providerUrl = "
const provider = new Web3(new Web3.providers.HttpProvider(providerUrl));
Calling getFeeForMessage
The getFeeForMessage RPC function is called with a message that contains the data to be paid for. Here’s an example of how you can call it:
const messages = [
{
id: "fairy",
message: "10 SOL"
},
//Add more messages as needed
];
const feeMessage = messages[0].message; // 10 SOL
Calling getFeeForMessage with a JSON object
If you have a JSON object containing the data to be paid for, you can call getFeeForMessage like this:
const jsonData = {
id: "fairy",
message: { type: "solidity", address: "0x...your_solana_address...", amount: 10 }
};
const feeJsonObject = JSON.stringify(jsonData);
Passing the data to getFeeForMessage
The getFeeForMessage function takes a string or a JSON object as an argument. To pass the data, you’ll need to use either of the following methods:
Method 1: Passing as a string
You can convert the JSON object to a string and pass it as an argument:
const feeJsonString = JSON.stringify(jsonData);
getFeeForMessage(feeJsonString); // Note: This will not work, as getFeeForMessage expects a string or a JSON object.
Method 2: Passing directly to the function
Alternatively, you can pass the data directly to the getFeeForMessage function:
const fee = {
id: "fairy",
message: {
type: "solidity",
address: "0x...your_solana_address...",
amount: 10
}
};
getFeeForMessage(JSON.stringify(fee));
Example
Here’s an example of how to call the getFeeForMessage function with a JSON object:
const jsonData = {
id: "fairy",
message: { type: "solidity", address: "0x...your_solana_address...", amount: 10 }
};
const feeJsonObject = JSON.stringify(jsonData);
provider.send("getFeeForMessage", [feeJsonObject]).then((result) => {
console.log(result);
}).catch((error) => {
console.error(error);
});
By following these steps and using the correct method to pass the data, you should be able to call the getFeeForMessage RPC function successfully in your Solana application.
