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The owner can update contract addresses so that a contract name always points to the latest version of the given contract. Other contracts can query the registry to get updated addresses instead of depending on specific addresses. Note that contract names are limited to 32 bytes UTF8 encoded ASCII strings to optimize gas costs\",\"events\":{\"AddressUpdate(bytes32,address)\":{\"details\":\"triggered when an address pointed to by a contract name is modified\",\"params\":{\"_contractAddress\":\"new contract address\",\"_contractName\":\"contract name\"}}},\"kind\":\"dev\",\"methods\":{\"acceptOwnership()\":{\"details\":\"used by a new owner to accept an ownership transfer\"},\"addressOf(bytes32)\":{\"details\":\"returns the address associated with the given contract name\",\"params\":{\"_contractName\":\"contract name\"},\"returns\":{\"_0\":\"contract address\"}},\"getAddress(bytes32)\":{\"details\":\"deprecated, backward compatibility\"},\"itemCount()\":{\"details\":\"returns the number of items in the registry\",\"returns\":{\"_0\":\"number of items\"}},\"registerAddress(bytes32,address)\":{\"details\":\"registers a new address for the contract name in the registry\",\"params\":{\"_contractAddress\":\"contract address\",\"_contractName\":\"contract name\"}},\"transferOwnership(address)\":{\"details\":\"allows transferring the contract ownership the new owner still needs to accept the transfer can only be called by the contract owner\",\"params\":{\"_newOwner\":\"new contract owner\"}},\"unregisterAddress(bytes32)\":{\"details\":\"removes an existing contract address from the registry\",\"params\":{\"_contractName\":\"contract name\"}}},\"version\":1},\"userdoc\":{\"kind\":\"user\",\"methods\":{},\"version\":1}},\"settings\":{\"compilationTarget\":{\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/ContractRegistry.sol\":\"ContractRegistry\"},\"evmVersion\":\"istanbul\",\"libraries\":{},\"metadata\":{\"bytecodeHash\":\"ipfs\"},\"optimizer\":{\"enabled\":true,\"runs\":200},\"remappings\":[]},\"sources\":{\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/ContractRegistry.sol\":{\"keccak256\":\"0x2c528338138def339adcf2cff6003747add2baec544025f9e00e8ac7ca3ae9a5\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://3bf4a4cd09bf05a9c83a7255989bddf55afe82e201e83492ca7d5dc3bb95eb22\",\"dweb:/ipfs/QmUBkzUfk5x8sAW4Xm9krmBkQCYx9nziKNdhMehbCCtoWT\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/Owned.sol\":{\"keccak256\":\"0x6ef69d9dcc80a8a36d5eb37783375cd5e4831c6d20c723fa6f6b6a06c0aeb53d\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://5a5d087e2c5b47739615ef22e1f29749de44b43c9a37cfae32b3dfc498a258c4\",\"dweb:/ipfs/Qmd1mXKEQbmBxqHk326LGVzNoayXsam8gZNecknnYpBnyh\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/Utils.sol\":{\"keccak256\":\"0x073efa69fcd6b5e60f841b28b366d63b62ff48ab12a06ce3f5a7f41afd6ce885\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://e8b8ecb2d29197ca77f0ed98f728ace54e6edcfdf5cd1194ae22701607eaf608\",\"dweb:/ipfs/QmcsR6Q35Hurh3TrPkYAboicz9bQQoGCWmZLzUCDyhotH8\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/interfaces/IContractRegistry.sol\":{\"keccak256\":\"0x3551889a83738b621c29ed66f1ecb6a843cca4217e54c9357198559b9cc92259\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://231a59c8f2665adeda8c7e6930832409c9b991fd27ad84b3a24335e7bf269bbe\",\"dweb:/ipfs/QmeJJbn1EAUbZenruTEdJAnwUn3dxsVNeJvxPe81qKEGqL\"]},\"/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/interfaces/IOwned.sol\":{\"keccak256\":\"0xc60a9d197abc28c1906ed4d18b59caa0242db754a0e1f67af6e6277593530dae\",\"license\":\"SEE LICENSE IN LICENSE\",\"urls\":[\"bzz-raw://a8c6f3e6525a81a5165ccbf04f73f6c389c14b74135d11a7b5f70b1c9bdac75c\",\"dweb:/ipfs/QmaPu4Z7yUPc9sMADmoTZVY6AnyDSYHtNNCx3mm4VkJwhP\"]}},\"version\":1}",
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"source": "// SPDX-License-Identifier: SEE LICENSE IN LICENSE\r\npragma solidity 0.6.12;\r\nimport \"./Owned.sol\";\r\nimport \"./Utils.sol\";\r\nimport \"./interfaces/IContractRegistry.sol\";\r\n\r\n/**\r\n * @dev Contract Registry\r\n *\r\n * The contract registry keeps contract addresses by name.\r\n * The owner can update contract addresses so that a contract name always points to the latest version\r\n * of the given contract.\r\n * Other contracts can query the registry to get updated addresses instead of depending on specific\r\n * addresses.\r\n *\r\n * Note that contract names are limited to 32 bytes UTF8 encoded ASCII strings to optimize gas costs\r\n*/\r\ncontract ContractRegistry is IContractRegistry, Owned, Utils {\r\n struct RegistryItem {\r\n address contractAddress; // contract address\r\n uint256 nameIndex; // index of the item in the list of contract names\r\n }\r\n\r\n mapping (bytes32 => RegistryItem) private items; // name -> RegistryItem mapping\r\n string[] public contractNames; // list of all registered contract names\r\n\r\n /**\r\n * @dev triggered when an address pointed to by a contract name is modified\r\n *\r\n * @param _contractName contract name\r\n * @param _contractAddress new contract address\r\n */\r\n event AddressUpdate(bytes32 indexed _contractName, address _contractAddress);\r\n\r\n /**\r\n * @dev returns the number of items in the registry\r\n *\r\n * @return number of items\r\n */\r\n function itemCount() public view returns (uint256) {\r\n return contractNames.length;\r\n }\r\n\r\n /**\r\n * @dev returns the address associated with the given contract name\r\n *\r\n * @param _contractName contract name\r\n *\r\n * @return contract address\r\n */\r\n function addressOf(bytes32 _contractName) public view override returns (address) {\r\n return items[_contractName].contractAddress;\r\n }\r\n\r\n /**\r\n * @dev registers a new address for the contract name in the registry\r\n *\r\n * @param _contractName contract name\r\n * @param _contractAddress contract address\r\n */\r\n function registerAddress(bytes32 _contractName, address _contractAddress)\r\n public\r\n ownerOnly\r\n validAddress(_contractAddress)\r\n {\r\n // validate input\r\n require(_contractName.length > 0, \"ERR_INVALID_NAME\");\r\n\r\n // check if any change is needed\r\n address currentAddress = items[_contractName].contractAddress;\r\n if (_contractAddress == currentAddress)\r\n return;\r\n\r\n if (currentAddress == address(0)) {\r\n // update the item's index in the list\r\n items[_contractName].nameIndex = contractNames.length;\r\n\r\n // add the contract name to the name list\r\n contractNames.push(bytes32ToString(_contractName));\r\n }\r\n\r\n // update the address in the registry\r\n items[_contractName].contractAddress = _contractAddress;\r\n\r\n // dispatch the address update event\r\n emit AddressUpdate(_contractName, _contractAddress);\r\n }\r\n\r\n /**\r\n * @dev removes an existing contract address from the registry\r\n *\r\n * @param _contractName contract name\r\n */\r\n function unregisterAddress(bytes32 _contractName) public ownerOnly {\r\n // validate input\r\n require(_contractName.length > 0, \"ERR_INVALID_NAME\");\r\n require(items[_contractName].contractAddress != address(0), \"ERR_INVALID_NAME\");\r\n\r\n // remove the address from the registry\r\n items[_contractName].contractAddress = address(0);\r\n\r\n // if there are multiple items in the registry, move the last element to the deleted element's position\r\n // and modify last element's registryItem.nameIndex in the items collection to point to the right position in contractNames\r\n if (contractNames.length > 1) {\r\n string memory lastContractNameString = contractNames[contractNames.length - 1];\r\n uint256 unregisterIndex = items[_contractName].nameIndex;\r\n\r\n contractNames[unregisterIndex] = lastContractNameString;\r\n bytes32 lastContractName = stringToBytes32(lastContractNameString);\r\n RegistryItem storage registryItem = items[lastContractName];\r\n registryItem.nameIndex = unregisterIndex;\r\n }\r\n\r\n // remove the last element from the name list\r\n contractNames.pop();\r\n // zero the deleted element's index\r\n items[_contractName].nameIndex = 0;\r\n\r\n // dispatch the address update event\r\n emit AddressUpdate(_contractName, address(0));\r\n }\r\n\r\n /**\r\n * @dev utility, converts bytes32 to a string\r\n * note that the bytes32 argument is assumed to be UTF8 encoded ASCII string\r\n *\r\n * @return string representation of the given bytes32 argument\r\n */\r\n function bytes32ToString(bytes32 _bytes) private pure returns (string memory) {\r\n bytes memory byteArray = new bytes(32);\r\n for (uint256 i = 0; i < 32; i++) {\r\n byteArray[i] = _bytes[i];\r\n }\r\n\r\n return string(byteArray);\r\n }\r\n\r\n /**\r\n * @dev utility, converts string to bytes32\r\n * note that the bytes32 argument is assumed to be UTF8 encoded ASCII string\r\n *\r\n * @return string representation of the given bytes32 argument\r\n */\r\n function stringToBytes32(string memory _string) private pure returns (bytes32) {\r\n bytes32 result;\r\n assembly {\r\n result := mload(add(_string,32))\r\n }\r\n return result;\r\n }\r\n\r\n /**\r\n * @dev deprecated, backward compatibility\r\n */\r\n function getAddress(bytes32 _contractName) public view returns (address) {\r\n return addressOf(_contractName);\r\n }\r\n}\r\n",
"sourcePath": "/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/ContractRegistry.sol",
"ast": {
"absolutePath": "/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/ContractRegistry.sol",
"exportedSymbols": {
"ContractRegistry": [
21514
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},
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"license": "SEE LICENSE IN LICENSE",
"nodeType": "SourceUnit",
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{
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{
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"file": "./Owned.sol",
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"src": "77:21:55",
"symbolAliases": [],
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{
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{
"absolutePath": "/home/lash/src/ext/cic/grassrootseconomics/bancor-contracts/solidity/contracts/utility/interfaces/IContractRegistry.sol",
"file": "./interfaces/IContractRegistry.sol",
"id": 21217,
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"src": "123:44:55",
"symbolAliases": [],
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{
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"baseName": {
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"id": 21219,
"name": "IContractRegistry",
"nodeType": "UserDefinedTypeName",
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"src": "662:17:55",
"typeDescriptions": {
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"typeString": "contract IContractRegistry"
}
},
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"nodeType": "UserDefinedTypeName",
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"src": "681:5:55",
"typeDescriptions": {
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"typeString": "contract Owned"
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{
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"src": "688:5:55",
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22661,
22831,
22847
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"contractKind": "contract",
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"id": 21218,
"nodeType": "StructuredDocumentation",
"src": "171:460:55",
"text": " @dev Contract Registry\n The contract registry keeps contract addresses by name.\n The owner can update contract addresses so that a contract name always points to the latest version\n of the given contract.\n Other contracts can query the registry to get updated addresses instead of depending on specific\n addresses.\n Note that contract names are limited to 32 bytes UTF8 encoded ASCII strings to optimize gas costs"
},
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"id": 21514,
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"src": "732:23:55",
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{
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