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feat: (de/in)crease allowance (#56)

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Adam Uhlíř 2023-10-16 10:23:58 +02:00 committed by GitHub
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commit 620b402a7d
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18
ethers/erc20.nim
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@ -54,6 +54,24 @@ method approve*(token: Erc20Token,
amount: UInt256): ?TransactionResponse {.base, contract.}
## Sets `amount` as the allowance of `spender` over the caller's tokens.
method increaseAllowance*(token: Erc20Token,
spender: Address,
addedValue: UInt256): ?TransactionResponse {.base, contract.}
## Atomically increases the allowance granted to spender by the caller.
## This is an alternative to approve that can be used as a mitigation for problems described in IERC20.approve.
## Emits an Approval event indicating the updated allowance.
##
## WARNING: THIS IS NON-STANDARD ERC-20 FUNCTION, DOUBLE CHECK THAT YOUR TOKEN HAS IT!
method decreaseAllowance*(token: Erc20Token,
spender: Address,
addedValue: UInt256): ?TransactionResponse {.base, contract.}
## Atomically decreases the allowance granted to spender by the caller.
## This is an alternative to approve that can be used as a mitigation for problems described in IERC20.approve.
## Emits an Approval event indicating the updated allowance.
##
## WARNING: THIS IS NON-STANDARD ERC-20 FUNCTION, DOUBLE CHECK THAT YOUR TOKEN HAS IT!
method transferFrom*(token: Erc20Token,
spender: Address,
recipient: Address,

26
testmodule/testErc20.nim
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@ -69,6 +69,32 @@ for url in ["ws://localhost:8545", "http://localhost:8545"]:
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
test "increase/decrease allowance":
discard await testToken.mint(accounts[0], 100.u256)
check (await token.allowance(accounts[0], accounts[1])) == 0.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.increaseAllowance(accounts[1], 50.u256)
check (await token.allowance(accounts[0], accounts[1])) == 50.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.increaseAllowance(accounts[1], 50.u256)
check (await token.allowance(accounts[0], accounts[1])) == 100.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
discard await token.decreaseAllowance(accounts[1], 50.u256)
check (await token.allowance(accounts[0], accounts[1])) == 50.u256
check (await token.balanceOf(accounts[0])) == 100.u256
check (await token.balanceOf(accounts[1])) == 0.u256
test "transferFrom tokens":
let senderAccount = accounts[0]
let receiverAccount = accounts[1]