Implementations of the present specification include receiving, from a smart contract, and by a function controller executing within the blockchain network, a function call to execute a function, the function call including data for execution of the function, transmitting, by the function controller, the data of the function call to a function component, the function component executing the function based on the data of the function call, receiving, by the function controller, a function result from the function component, and providing, by the function controller, the function result to the smart contract.