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Grouping Multiple Calls into a Single Function: Smart Contract Method
When building smart contracts on the Ethereum blockchain, developers are often challenged with implementing monolithic functions that perform complex tasks when requested by users. In this article, we will explore how to combine multiple calls into a single function using a combination of smart contract methods.
The Problem with Monolithic Functions
Monolithic functions are designed to perform a specific task when executed by the user. However, grouping multiple calls into a single function can lead to performance issues and increase complexity. For example:
- Gas Consumption: Each call requires gas fees, which can quickly add up if users make multiple requests.
- Increased Complexity: With more complex features, the contract becomes harder to maintain and scale.
Solution: Group Calls Using a Single Function
To solve these problems, we will implement a packaging mechanism using a single function. This method allows us to:
- Multiple Call Stack: We will create a single function that accepts multiple inputs and executes them sequentially.
- Optimize Gas Consumption: By grouping calls, we can reduce the amount of gas costs incurred by each user.
Contract Structure
Our contract will consist of three main functions: batchCall, executeFunction, and handleError. The batchCall function accepts multiple inputs and executeFunction handles the actual execution. The handleError function is used to handle any errors that may occur during packaging.
pragma robustness ^0.8.0;
BatchCall contract {
// Map input addresses to corresponding values
map(address => uint256) public inputs ;
// Array of input values
uint256[] public values;
// Current index of the input array
uint256 currentIndex = 0;
// Event sent when the package executes successfully
event BatchCallExecuted(indexed user address, indexed call function address);
// Function to execute a single function at a specific address
function executeFunction(address callFunction) public {
inputs[callFunction] = values[currentIndex];
currentindex++;
}
// Function to combine multiple calls into a single execution
function batchCall(address[] inputAddresses memory, uint256[] valueArrays memory) public {
// Validate the lengths of the input arrays and their contents
request(inputAddresses.length == valueArrays.length, "The lengths of the input arrays do not match");
Requirement(valueArrays.length == values.length, "Input array lengths do not match");
// Group all calls into one execution
for (uint256 i = 0; i < valueArrays.length; i++) {
inputs[inputAddresses[i]] = valueArrays[i];
}
// Execute the batch function on each input address
for (user address inputAddresses) {
executeFunction(user);
}
}
// Event sent when the packet is successful
event BatchCallExecuted(indexed user address, uint256[] memory entries);
// Error handling mechanism
error BatchCallError(string memory message);
}
Example Use Case
To demonstrate the effectiveness of the packaging method, let’s create a simple example using two input addresses and two arrays of values.
“` force
batchCall(address[] memory inputAddresses, uint256[] memory valueArrays) public {
// Execute each batch function at a different address
for (user address inputAddresses) {
executeFunction(user);
}
// Handle any errors that may occur during packaging
handleError(“Batch call error”);
}
error BatchCallError(Message string memory) public {
emit BatchCallExecuted(msg.
