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Bundling Multiple Calls into a Single Function: A Smart Contract Approach
When building smart contracts on the Ethereum blockchain, developers often face the challenge of implementing monolithic functions that perform complex tasks when called by users. In this article, we will explore how to bundle multiple calls into a single function using a combination of smart contract techniques.
The Problem with Monolithic Functions
Monolithic functions are designed to solve a specific task when executed by a user. However, bundling multiple calls into a single function can lead to performance issues and increased complexity. For example:
- Gas Consumption: Each call involves fuel costs, which can quickly add up if users make multiple requests.
- Increased Complexity: With more complex functions, the contract becomes more difficult to maintain and debug.
Solution: Bundling Calls into a Single Function
To address these issues, we will implement a bundling mechanism using a single function. This approach allows us to:
- Batch multiple calls: We will create a single function that accepts multiple inputs and executes them sequentially.
- Optimize gas consumption: By grouping calls, we can reduce the number 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, while executeFunction handles the actual execution. The handleError function is used to handle any errors that may occur during batch collection.
pragma solidity ^0.8.0;
contract BatchCall {
// Mapping input addresses to their corresponding values
mapping (address => uint256) public inputs;
// Array of input values
uint256[] public values;
// Current index for input array
uint256 currentIndex = 0;
// Event emitted when batch executes successfully
event BatchCallExecuted(user indexed by address, CallFunction indexed by address);
// Function to execute a single function at a specific address
function executeFunction(callFunction address) public {
inputs[callFunction] = values[currentIndex];
currentIndex++;
}
// Function to group multiple calls into a single execution
function batchCall(address[] memory input addresses, uint256[] memory value arrays) public {
// Validate input array lengths and their contents
require(inputAddresses.length == valueArrays.length, "Input array lengths do not match");
require(valueArrays.length == values.length, "Input array lengths do not match");
// Batch all calls into a single execution
for (uint256 i = 0; i < valueArrays.length; i++) {
inputs[inputAddresses[i]] = valueArrays[i];
}
// Execute the batch function on each input address
for (userAddress in inputAddresses) {
executeFunction(user);
}
}
// Event emitted when batching is successful
event BatchCallExecuted(indexeduserAddress, uint256[] memoryInputs);
// Error Handling Mechanism
error BatchCallError(string memoryMessage);
}
Usage Example
To demonstrate the effectiveness of our batch approach, let’s create a simple example using two input addresses and two value arrays.
“`solidity
batchCall(address[] memory input addresses, uint256[] memory arrays values) public {
// Execute each batch function at a different address
for (user address in inputAddresses) {
executeFunction(user);
}
// Handle any errors that may occur during batching
handleError(“Batch Call Error”);
}
error BatchCallError(string memory message) public {
emit BatchCallExecuted(msg.