{
    "Function": "_openPosition",
    "File": "contracts/ClearingHouse.sol",
    "Parent Contracts": [
        "contracts/legos/HubbleBase.sol",
        "node_modules/@openzeppelin/contracts/metatx/ERC2771Context.sol",
        "node_modules/@openzeppelin/contracts/security/Pausable.sol",
        "node_modules/@openzeppelin/contracts/utils/Context.sol",
        "contracts/legos/Governable.sol",
        "node_modules/@openzeppelin/contracts/proxy/utils/Initializable.sol",
        "contracts/legos/Governable.sol",
        "contracts/Interfaces.sol"
    ],
    "High-Level Calls": [
        "IMarginAccount",
        "IAMM"
    ],
    "Internal Calls": [
        "require(bool,string)",
        "_blockTimestamp",
        "_chargeFeeAndRealizePnL",
        "isAboveMinAllowableMargin",
        "require(bool,string)",
        "updatePositions"
    ],
    "Library Calls": [],
    "Low-Level Calls": [],
    "Code": "function _openPosition(address trader, uint idx, int256 baseAssetQuantity, uint quoteAssetLimit) internal {\n        require(baseAssetQuantity != 0, \"CH: baseAssetQuantity == 0\");\n\n        updatePositions(trader); // adjust funding payments\n\n        (int realizedPnl, uint quoteAsset, bool isPositionIncreased) = amms[idx].openPosition(trader, baseAssetQuantity, quoteAssetLimit);\n        uint _tradeFee = _chargeFeeAndRealizePnL(trader, realizedPnl, quoteAsset, false /* isLiquidation */);\n        marginAccount.transferOutVusd(address(insuranceFund), _tradeFee);\n\n        if (isPositionIncreased) {\n            require(isAboveMinAllowableMargin(trader), \"CH: Below Minimum Allowable Margin\");\n        }\n        emit PositionModified(trader, idx, baseAssetQuantity, quoteAsset, _blockTimestamp());\n    }"
}