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EbakusDB.json
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{
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"source": "pragma solidity ^0.5.0;\n\n/**\n * @title EbakusDB\n * @author Ebakus\n * @notice Library for giving access to EbakusDB\n */\nlibrary EbakusDB {\n\n /**\n * @notice Create a table at EbakusDB\n * @dev This has to be called once per table. Usually it makes sense to occur in contract's constructor,\n * as it will run once and will be removed from the deployed code.\n * Important, \"Id\" field has to exist in every table/struct.\n * @param tableName Table name\n * @param indexes List of indexed fields (comma separated)\n * @param tablesAbi ABI represantation of the solidity struct defining the table\n *\n * Example solidity struct:\n *\n * struct User {\n * uint64 Id;\n * string Name;\n * }\n *\n * Example table ABI:\n *\n * [{\n * \"type\": \"table\",\n * \"name\": \"Users\",\n * \"inputs\": [\n * {\"name\": \"Id\", \"type\": \"uint64\"},\n * {\"name\": \"Name\", \"type\": \"string\"},\n * ]\n * }]\n */\n function createTable(string memory tableName, string memory indexes, string memory tablesAbi) internal {\n bytes memory input = abi.encodeWithSignature(\"createTable(string,string,string)\", tableName, indexes, tablesAbi);\n\n assembly {\n let size := mload(input)\n let x := add(input, 0x20)\n\n if iszero(call(not(0), 0x102, 0, x, size, x, 0x00)) {\n revert(0, 0)\n }\n }\n }\n\n /**\n * @notice Get a single entry from EbakusDB\n * @dev Transaction will fail if nothing is mathed in EbakusDB\n * @param tableName Table name\n * @param whereClause WhereClause for finding an entry\n * Supported conditions are \"<\", \">\", \"=\", \"==\", \"<=\", \">=\", \"!=\", \"LIKE\"\n * Example use case: Phone = \"555-1111\"\n * Id >= 3\n * @param orderClause OrderClause for sorting the results using \"ASC\" or \"DESC\"\n * Example use case: Phone DESC\n * @return ABI encoded object, read using abi.decode(...)\n */\n function get(string memory tableName, string memory whereClause, string memory orderClause) internal view returns (bytes memory o) {\n bytes memory input = abi.encodeWithSignature(\"get(string,string,string)\", tableName, whereClause, orderClause);\n return getBytes(input);\n }\n\n /**\n * @notice Select entries from EbakusDB\n * @param tableName Table name\n * @param whereClause WhereClause for finding an entry\n * Supported conditions are \"<\", \">\", \"=\", \"==\", \"<=\", \">=\", \"!=\", \"LIKE\"\n * Example use case: Phone = \"555-1111\"\n * Id >= 3\n * @param orderClause OrderClause for sorting the results using \"ASC\" or \"DESC\"\n * Example use case: Phone DESC\n * @return Select iterator that has to be passed in EbakusDB.next(...)\n */\n function select(string memory tableName, string memory whereClause, string memory orderClause) internal view returns (bytes32 o) {\n bytes memory input = abi.encodeWithSignature(\"select(string,string,string)\", tableName, whereClause, orderClause);\n\n assembly {\n let size := mload(input)\n let x := add(input, 0x20)\n\n if iszero(staticcall(not(0), 0x102, x, size, o, 0x20)) {\n revert(0, 0)\n }\n o := mload(o)\n }\n }\n\n /**\n * @notice Insert/Update an entry in EbakusDB\n * @param tableName Table name\n * @param data ABI encoded object, encode using abi.encode(...)\n * @return true if entry has been inserted/updated\n */\n function insertObj(string memory tableName, bytes memory data) internal returns (bool o) {\n bytes memory input = abi.encodeWithSignature(\"insertObj(string,bytes)\", tableName, data);\n return getBool(input);\n }\n\n /**\n * @notice Delete an entry in EbakusDB\n * @param tableName Table name\n * @param data ABI encoded object's \"Id\" value, encode using abi.encode(...)\n * @return true if entry has been deleted\n */\n function deleteObj(string memory tableName, bytes memory data) internal returns (bool o) {\n bytes memory input = abi.encodeWithSignature(\"deleteObj(string,bytes)\", tableName, data);\n return getBool(input);\n }\n\n /**\n * @notice Get next entry for a select query made at EbakusDB\n * @param iter Select's iterator retrieved by EbakusDB.select(...)\n * @return ABI encoded object, read using abi.decode(...)\n */\n function next(bytes32 iter) internal view returns (bytes memory o, bool found) {\n bytes memory input = abi.encodeWithSignature(\"next(bytes32)\", iter);\n o = getBytes(input);\n return (o, o.length > 0);\n }\n\n /**\n * @notice Call EbakusDB system contract and fetch back some bytes\n * @param input ABI encoded EbakusDB system contract command\n * @return ABI encoded object, read using abi.decode(...)\n */\n function getBytes(bytes memory input) private view returns (bytes memory o) {\n assembly {\n let size := mload(input)\n let x := add(input, 0x20)\n\n if iszero(staticcall(not(0), 0x102, x, size, o, 0xffff)) {\n revert(0, 0)\n }\n\n let osize := mload(o)\n mstore(0x40, add(mload(0x40), add(osize, 0x20)))\n }\n }\n\n /**\n * @notice Call EbakusDB system contract and fetch back a boolean value\n * @param input ABI encoded EbakusDB system contract command\n * @return boolean\n */\n function getBool(bytes memory input) private returns (bool o) {\n assembly {\n let size := mload(input)\n let x := add(input, 0x20)\n\n if iszero(call(not(0), 0x102, 0, x, size, o, 0x20)) {\n revert(0, 0)\n }\n o := mload(o)\n }\n }\n}",
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