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I deployed a ERC20Mintable token in truffle environment(the source file is ERC20Mintable.sol).

The mint function is declared with onlyMinter modifer:

contract ERC20Mintable is ERC20, MinterRole { function mint(address account, uint256 amount) public onlyMinter returns (bool) { _mint(account, amount); return true; } }

Minter role info is:

truffle(develop)> instance.isMinter(accounts[0]) true truffle(develop)> instance.isMinter(accounts[1]) false truffle(develop)> instance.isMinter(accounts[2]) false truffle(develop)> instance.isMinter(accounts[3]) false

However,when I try to mint token, I found the modifier can not take effect to control the function call right:

For the first account:

truffle(develop)> instance.mint(accounts[0],1000) { tx: '0x323ff19c7b79cbe545914465c9bda87aa5169cdaa3be6f4ccbebcd7e7eb76617', receipt: { transactionHash: ... truffle(develop)> instance.totalSupply() <BN: 3e8>//1000

For the second account:

truffle(develop)> instance.mint(accounts[1],1000) { tx: '0xc13da9ca6ba8b74e998b4b158eb1be02208e2bc8f08c789f4a6a306bedadc7a1', receipt: { transactionHash: truffle(develop)> instance.totalSupply() <BN: 7d0>//2000 truffle(develop)> instance.balanceOf(accounts[0]) <BN: 3e8>//1000 truffle(develop)> instance.balanceOf(accounts[1]) <BN: 3e8>//1000 truffle(develop)> instance.balanceOf(accounts[2]) <BN: 0>

From the result, every account is able to mint token, onlyMinter has no capability to control function call role.

How can I fix the problem? Thanks.

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  • 1
    read the comments for the mint function github.com/OpenZeppelin/openzeppelin-solidity/blob/…. The argument passed is the recipient. That is not the caller of the function. Commented Jul 8, 2019 at 4:36
  • 1
    Got it! how can I change the account in truffle env in order to test other account's function? Commented Jul 8, 2019 at 6:50
  • token.mint(accounts[9], "10000000000000000000", {from:accounts[0]}) Commented Jul 8, 2019 at 9:16

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To manually test the MinterRole you need to change the account you are sending the transaction from. e.g. accounts[0] has the MinterRole, accounts[1] does not have the MinterRole so reverts when you attempt to mint.

truffle(develop)> accounts = await web3.eth.getAccounts() truffle(develop)> token.mint(accounts[9], "10000000000000000000", {from:accounts[0]}) { tx: .... truffle(develop)> token.mint(accounts[9], "10000000000000000000", {from:accounts[1]}) Thrown: { Error: Returned error: VM Exception while processing transaction: revert MinterRole: caller does not have the Minter role -- Reason given: MinterRole: caller does not have the Minter role.

OpenZeppelin documentation has a guide on tokens: https://docs.openzeppelin.org/v2.3.0/tokens

If you have questions about using OpenZeppelin you can also ask questions in the community forum: https://forum.zeppelin.solutions

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