About Batch Call

The host contract provides a bespoke solution for batching super token operations, agreements operations and app actions.

Operation Data

Each operation is described by this struct:

    /**
     * @dev Batch operation data
     */
    struct Operation {
        // Operation type. Defined in BatchOperation (Definitions.sol)
        uint32 operationType;
        // Operation target
        address target;
        // Data specific to the operation
        bytes data;
    }

operationType is a set of enumerable constants defined in BatchOperation library (NB! to be moved to global scope soon).

Plain Old `batchCall`

The most simple version of the batch call is to call batchCall directly.
This can be used for operations to be executed on behalf of the transaction sender itself.

EIP-2771 `forwardBatchCall`

ERC-2771 defines a contract-level protocol for Recipient contracts to accept meta-transactions through trusted Forwarder contracts.

By being a trusted forwarder (checked through getTrustedForwarderConfigKey governance method), a contract can call forwardBatchCall on behalf of any address. Due to this power, there are very strict requirements on which contracts can be trusted forwarder; usually they should be immutable, verified and perhaps audited.