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* test: add the tests * ci: enable integration test * ci: always run integration tests * ci: build integration tests deps * ci: cache integration test deps * ci: properly cache yarn deps * fix(integration-tests): clone the provider instead of referencing Otherwise it interferes with test isolation * chore: yarn lint
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| // SPDX-License-Identifier: MIT | ||
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| pragma solidity >=0.6.2 <0.8.0; | ||
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| /** | ||
| * @dev Collection of functions related to the address type | ||
| */ | ||
| library Address { | ||
| /** | ||
| * @dev Returns true if `account` is a contract. | ||
| * | ||
| * [IMPORTANT] | ||
| * ==== | ||
| * It is unsafe to assume that an address for which this function returns | ||
| * false is an externally-owned account (EOA) and not a contract. | ||
| * | ||
| * Among others, `isContract` will return false for the following | ||
| * types of addresses: | ||
| * | ||
| * - an externally-owned account | ||
| * - a contract in construction | ||
| * - an address where a contract will be created | ||
| * - an address where a contract lived, but was destroyed | ||
| * ==== | ||
| */ | ||
| function isContract(address account) internal view returns (bool) { | ||
| // This method relies on extcodesize, which returns 0 for contracts in | ||
| // construction, since the code is only stored at the end of the | ||
| // constructor execution. | ||
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| uint256 size; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly { size := extcodesize(account) } | ||
| return size > 0; | ||
| } | ||
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| /** | ||
| * @dev Replacement for Solidity's `transfer`: sends `amount` wei to | ||
| * `recipient`, forwarding all available gas and reverting on errors. | ||
| * | ||
| * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost | ||
| * of certain opcodes, possibly making contracts go over the 2300 gas limit | ||
| * imposed by `transfer`, making them unable to receive funds via | ||
| * `transfer`. {sendValue} removes this limitation. | ||
| * | ||
| * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. | ||
| * | ||
| * IMPORTANT: because control is transferred to `recipient`, care must be | ||
| * taken to not create reentrancy vulnerabilities. Consider using | ||
| * {ReentrancyGuard} or the | ||
| * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. | ||
| */ | ||
| function sendValue(address payable recipient, uint256 amount) internal { | ||
| require(address(this).balance >= amount, "Address: insufficient balance"); | ||
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| // solhint-disable-next-line avoid-low-level-calls, avoid-call-value | ||
| (bool success, ) = recipient.call{ value: amount }(""); | ||
| require(success, "Address: unable to send value, recipient may have reverted"); | ||
| } | ||
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| /** | ||
| * @dev Performs a Solidity function call using a low level `call`. A | ||
| * plain`call` is an unsafe replacement for a function call: use this | ||
| * function instead. | ||
| * | ||
| * If `target` reverts with a revert reason, it is bubbled up by this | ||
| * function (like regular Solidity function calls). | ||
| * | ||
| * Returns the raw returned data. To convert to the expected return value, | ||
| * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. | ||
| * | ||
| * Requirements: | ||
| * | ||
| * - `target` must be a contract. | ||
| * - calling `target` with `data` must not revert. | ||
| * | ||
| * _Available since v3.1._ | ||
| */ | ||
| function functionCall(address target, bytes memory data) internal returns (bytes memory) { | ||
| return functionCall(target, data, "Address: low-level call failed"); | ||
| } | ||
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| /** | ||
| * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with | ||
| * `errorMessage` as a fallback revert reason when `target` reverts. | ||
| * | ||
| * _Available since v3.1._ | ||
| */ | ||
| function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { | ||
| return functionCallWithValue(target, data, 0, errorMessage); | ||
| } | ||
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| /** | ||
| * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], | ||
| * but also transferring `value` wei to `target`. | ||
| * | ||
| * Requirements: | ||
| * | ||
| * - the calling contract must have an ETH balance of at least `value`. | ||
| * - the called Solidity function must be `payable`. | ||
| * | ||
| * _Available since v3.1._ | ||
| */ | ||
| function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { | ||
| return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); | ||
| } | ||
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| /** | ||
| * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but | ||
| * with `errorMessage` as a fallback revert reason when `target` reverts. | ||
| * | ||
| * _Available since v3.1._ | ||
| */ | ||
| function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { | ||
| require(address(this).balance >= value, "Address: insufficient balance for call"); | ||
| require(isContract(target), "Address: call to non-contract"); | ||
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| // solhint-disable-next-line avoid-low-level-calls | ||
| (bool success, bytes memory returndata) = target.call{ value: value }(data); | ||
| return _verifyCallResult(success, returndata, errorMessage); | ||
| } | ||
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| /** | ||
| * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], | ||
| * but performing a static call. | ||
| * | ||
| * _Available since v3.3._ | ||
| */ | ||
| function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { | ||
| return functionStaticCall(target, data, "Address: low-level static call failed"); | ||
| } | ||
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| /** | ||
| * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], | ||
| * but performing a static call. | ||
| * | ||
| * _Available since v3.3._ | ||
| */ | ||
| function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { | ||
| require(isContract(target), "Address: static call to non-contract"); | ||
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| // solhint-disable-next-line avoid-low-level-calls | ||
| (bool success, bytes memory returndata) = target.staticcall(data); | ||
| return _verifyCallResult(success, returndata, errorMessage); | ||
| } | ||
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| /** | ||
| * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], | ||
| * but performing a delegate call. | ||
| * | ||
| * _Available since v3.4._ | ||
| */ | ||
| function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { | ||
| return functionDelegateCall(target, data, "Address: low-level delegate call failed"); | ||
| } | ||
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| /** | ||
| * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], | ||
| * but performing a delegate call. | ||
| * | ||
| * _Available since v3.4._ | ||
| */ | ||
| function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { | ||
| require(isContract(target), "Address: delegate call to non-contract"); | ||
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| // solhint-disable-next-line avoid-low-level-calls | ||
| (bool success, bytes memory returndata) = target.delegatecall(data); | ||
| return _verifyCallResult(success, returndata, errorMessage); | ||
| } | ||
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| function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { | ||
| if (success) { | ||
| return returndata; | ||
| } else { | ||
| // Look for revert reason and bubble it up if present | ||
| if (returndata.length > 0) { | ||
| // The easiest way to bubble the revert reason is using memory via assembly | ||
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| // solhint-disable-next-line no-inline-assembly | ||
| assembly { | ||
| let returndata_size := mload(returndata) | ||
| revert(add(32, returndata), returndata_size) | ||
| } | ||
| } else { | ||
| revert(errorMessage); | ||
| } | ||
| } | ||
| } | ||
| } |
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