Strategy Router

Strategy Router contract for managing multi-strategy fund allocation

Overview

The StrategyRouter manages fund allocation across multiple DeFi strategies, handles rebalancing, and coordinates strategy operations like harvesting and deleveraging.

Contract Architecture

contract StrategyRouter is Ownable {
    // Vault that holds the tokens
    IVault public immutable vault;
    
    // Strategy list
    address[] public strategies;
    
    // Allocation targets in basis points (10000 = 100%)
    mapping(address => uint256) public targetBps;
}

Source: contracts/strategy/StrategyRouter.sol:18-27

Constructor

constructor(address _vault, address _owner) Ownable(_owner) {
    require(_vault != address(0), "vault=0");
    vault = IVault(_vault);
}

Source: contracts/strategy/StrategyRouter.sol:36-39

Strategy Management

Set Strategies

Configure strategies and their target allocations:

function setStrategies(
    address[] calldata _strats,
    uint256[] calldata _bps
) external onlyOwner {
    require(_strats.length == _bps.length, "len mismatch");
    
    delete strategies;
    
    uint256 total;
    for (uint256 i = 0; i < _strats.length; i++) {
        require(_strats[i] != address(0), "zero strat");
        strategies.push(_strats[i]);
        targetBps[_strats[i]] = _bps[i];
        total += _bps[i];
    }
    
    require(total == 10000, "targets must sum 10000");
    
    emit StrategiesUpdated();
}

Source: contracts/strategy/StrategyRouter.sol:45-64

Target allocations must sum to exactly 10000 basis points (100%).

Get Strategy Stats

function getStrategyStats(address strat)
    external view
    returns (
        uint256 balance,
        uint256 target,
        uint256 actualPct
    )
{
    balance = IStrategy(strat).strategyBalance();
    target = targetBps[strat];
    uint256 total = _computeTotalManaged();
    actualPct = total == 0 ? 0 : (balance * 10000) / total;
}

Source: contracts/strategy/StrategyRouter.sol:70-82

Get Portfolio State

function getPortfolioState()
    external view
    returns (
        address[] memory strats,
        uint256[] memory balances,
        uint256[] memory targets
    )
{
    strats = strategies;
    balances = new uint256[](strats.length);
    targets = new uint256[](strats.length);
    
    for (uint256 i = 0; i < strats.length; i++) {
        balances[i] = IStrategy(strats[i]).strategyBalance();
        targets[i] = targetBps[strats[i]];
    }
}

Source: contracts/strategy/StrategyRouter.sol:84-96

Fund Management

Move Funds to Strategy

function moveFundsToStrategy(address strat, uint256 amount) external onlyOwner {
    require(amount > 0, "zero amount");
    
    // vault → strategy
    vault.moveToStrategy(strat, amount);
    
    // strategy invests (with error handling)
    try IStrategy(strat).invest(amount) {
        // success
    } catch {
        emit StrategyWithdrawFailed(strat, "invest failed");
    }
}

Source: contracts/strategy/StrategyRouter.sol:105-120

Withdraw from Strategies

Called by vault when liquidity is needed:

function withdrawFromStrategies(uint256 amount) external returns (uint256) {
    require(msg.sender == address(vault), "not vault");
    require(amount > 0, "zero amount");
    
    IERC20 asset = IERC20(vault.asset());
    uint256 pulled = 0;
    uint256 requested = amount;
    
    for (uint256 i = 0; i < strategies.length && pulled < requested; i++) {
        address strat = strategies[i];
        uint256 need = requested - pulled;
        
        uint256 before = asset.balanceOf(address(vault));
        
        // Call withdraw on strategy with error handling
        try IStrategy(strat).withdrawToVault(need) {
            // success
        } catch (bytes memory reason) {
            string memory msgStr = _decodeRevertReason(reason);
            emit StrategyWithdrawFailed(strat, msgStr);
            continue;
        }
        
        uint256 afterBal = asset.balanceOf(address(vault));
        uint256 got = 0;
        if (afterBal > before) got = afterBal - before;
        pulled += got;
    }
    
    emit WithdrawnFromStrategies(requested, pulled);
    require(pulled >= requested, "strategies insufficient");
    
    return pulled;
}

Source: contracts/strategy/StrategyRouter.sol:135-170

Rebalancing

Automatic portfolio rebalancing to target allocations:

function rebalance() external onlyOwner {
    // Calculate initial total managed assets
    uint256 totalManaged = _computeTotalManaged();
    
    // Pull excess from overweight strategies
    for (uint256 i = 0; i < strategies.length; i++) {
        address strat = strategies[i];
        uint256 current = IStrategy(strat).strategyBalance();
        uint256 desired = (totalManaged * targetBps[strat]) / 10000;
        
        if (current > desired) {
            uint256 excess = current - desired;
            
            try IStrategy(strat).withdrawToVault(excess) returns (uint256 withdrawn) {
                if (withdrawn > 0) {
                    vault.receiveFromStrategy(withdrawn);
                }
            } catch (bytes memory reason) {
                emit StrategyWithdrawFailed(strat, _decodeRevertReason(reason));
            }
        }
    }
    
    // Recalculate after withdrawals
    totalManaged = _computeTotalManaged();
    uint256 vaultBal = vault.totalAssets();
    
    // Push to underweight strategies
    for (uint256 i = 0; i < strategies.length; i++) {
        address strat = strategies[i];
        uint256 current = IStrategy(strat).strategyBalance();
        uint256 desired = (totalManaged * targetBps[strat]) / 10000;
        
        if (current < desired && vaultBal > 0) {
            uint256 need = desired - current;
            uint256 amt = need <= vaultBal ? need : vaultBal;
            
            if (amt > 0) {
                vault.moveToStrategy(strat, amt);
                
                try IStrategy(strat).invest(amt) {
                    vaultBal -= amt;
                } catch (bytes memory reason) {
                    emit StrategyWithdrawFailed(strat, _decodeRevertReason(reason));
                }
            }
        }
    }
    
    emit Rebalanced(_computeTotalManaged());
}

Source: contracts/strategy/StrategyRouter.sol:176-232

Harvesting

Collect profits from all strategies:

function harvestAll() external onlyOwner {
    address[] memory list = strategies;
    
    for (uint256 i = 0; i < list.length; i++) {
        address strat = list[i];
        
        uint256 beforeBal = vault.totalAssets();
        
        // Trigger strategy harvest (tolerates failures)
        try IStrategy(strat).harvest() {
        } catch (bytes memory reason) {
            emit StrategyWithdrawFailed(strat, _decodeRevertReason(reason));
            continue;
        }
        
        uint256 afterBal = vault.totalAssets();
        
        if (afterBal > beforeBal) {
            uint256 profit = afterBal - beforeBal;
            // Vault will apply the fee internally
            vault.handleHarvestProfit(profit);
            
            emit Harvested(strat, profit);
        }
    }
}

Source: contracts/strategy/StrategyRouter.sol:273-298

Deleveraging

Trigger leverage unwinding for specific strategies:

function triggerDeleverage(address strat, uint256 maxLoops) external onlyOwner {
    require(strat != address(0), "zero strat");
    require(maxLoops > 0, "maxLoops must be > 0");
    
    try IStrategy(strat).deleverageAll(maxLoops) {
        emit DeleverageTriggered(strat, maxLoops);
    } catch (bytes memory reason) {
        emit StrategyWithdrawFailed(strat, _decodeRevertReason(reason));
    }
}

Source: contracts/strategy/StrategyRouter.sol:246-267

Helper Functions

Compute Total Managed

function _computeTotalManaged() internal view returns (uint256 total) {
    total = vault.totalAssets();
    for (uint256 i = 0; i < strategies.length; i++) {
        total += IStrategy(strategies[i]).strategyBalance();
    }
}

Source: contracts/strategy/StrategyRouter.sol:238-243

Decode Revert Reason

function _decodeRevertReason(bytes memory reason) internal pure returns (string memory) {
    if (reason.length >= 4) {
        bytes4 selector;
        assembly { selector := mload(add(reason, 32)) }
        if (selector == 0x08c379a0) {
            // decode Error(string)
            // ... assembly code to extract string
        }
    }
    return "revert";
}

Source: contracts/strategy/StrategyRouter.sol:302-332

Events

event StrategiesUpdated();
event Rebalanced(uint256 totalManaged);
event Harvested(address indexed strat, uint256 profit);
event WithdrawnFromStrategies(uint256 requested, uint256 pulled);
event DeleverageTriggered(address indexed strat, uint256 maxLoops);
event StrategyWithdrawFailed(address indexed strat, string reason);

Source: contracts/strategy/StrategyRouter.sol:29-34

Vault Interface

interface IVault {
    function asset() external view returns (address);
    function totalAssets() external view returns (uint256);
    function moveToStrategy(address strategy, uint256 amount) external;
    function receiveFromStrategy(uint256 amount) external;
    function handleHarvestProfit(uint256 profit) external;
}

Source: contracts/strategy/StrategyRouter.sol:9-16

Error Handling

The router includes comprehensive error handling:

• Try-Catch Blocks: All strategy interactions wrapped in try-catch
• Revert Decoding: Extracts readable error messages from reverts
• Graceful Degradation: Continues operations even if one strategy fails
• Event Emissions: Logs all failures for monitoring

Security Features

1. Access Control: Only owner can manage strategies and rebalance
2. Vault-Only Withdrawals: Only vault can request fund withdrawals
3. Strategy Validation: Checks for zero addresses
4. Allocation Validation: Ensures targets sum to 100%

Integration Example

// Deploy router
StrategyRouter router = new StrategyRouter(vaultAddress, ownerAddress);

// Set strategies with allocations
address[] memory strats = new address[](2);
strats[0] = aaveStrategyAddress;
strats[1] = leverageStrategyAddress;

uint256[] memory bps = new uint256[](2);
bps[0] = 7000; // 70% to Aave
bps[1] = 3000; // 30% to Leverage

router.setStrategies(strats, bps);

// Connect vault to router
vault.setRouter(address(router));

Next Steps

• Vault Contract Development
• Strategy Development
• Contract Deployment