with Soroban, the Smart Contract Platform on Stellar we can know what the address of an smart contract will be, when we deploy the contract using a Deployer contract or Factory contract.
In fact, from after soroban-sdk version 20.0.0-rc2 we can use the deployed_address method for a DeployerWithAddress struct. For more information please check the documentation here: https://docs.rs/soroban-sdk/20.0.0-rc2/soroban_sdk/deploy/struct.DeployerWithAddress.html#method.deployed_address
We can calculate the contract address like this:
pub fn calculate_address(
env: Env,
deployer: Address,
salt: BytesN<32>,
) -> Address {
let deployer_with_address = env.deployer().with_address(deployer.clone(), salt);
// Calculate deterministic address:
// This function can be called at anytime, before or after the contract is deployed, because contract addresses are deterministic.
// https://docs.rs/soroban-sdk/20.0.0-rc2/soroban_sdk/deploy/struct.DeployerWithAddress.html#method.deployed_address
let deterministic_address = deployer_with_address.deployed_address();
deterministic_address
}
I wrote a playground repo available here: https://github.com/paltalabs/deterministic-address-soroban
Where we answer the following questions:
1. Same WASM, different salt ✅
Can a deployer deploy 2 contracts with same WASM and different salt?
Answer: ✅ Yes!
Check test_deploy_from_contract_twice_same_wasm_different_salt
2. Same WASM, same salt ❌
Can a deployer deploys 2 contracts with same WASM and same salt?
Answer: ❌ No!
Check test_deploy_from_contract_twice_same_wasm_same_salt_should_panic
3. Different WASM, same salt ❌
Can a deployer deploys 2 different contracts (different WASM) with same salt?
Answer: ❌ No!
Check test_deploy_from_contract_different_wasm_same_salt_should_panic
This proves that in fact the contract addresses does not depend on the WASM, but on the combination of address & salt
4. Two deployers, same WASM, same salt ✅
Can one deployer deploys a (wasm/salt) and another deployer deploys the same (wasm/salt)?
Answer: ✅ Yes!
Check test_deploy_from_two_contract_deployers_same_wasm_same_salt
They have indeed different contract addreess, because, again, the contract address depends on the combination of address&salt.!!
5. Calculate a deterministic address
Can we calculate the address of a contract only knowing the address of the factory that will (or that already did) deploy the contract and the salt used (or to be used)?
Answer: ✅ Yes!
Check test_calculate_address
After soroban-sdk = { version = "20.0.0-rc2" }, we can use the deployed_address method for a DeployerWithAddress struct. For more information please check the documentation here: https://docs.rs/soroban-sdk/20.0.0-rc2/soroban_sdk/deploy/struct.DeployerWithAddress.html#method.deployed_address
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