Log

Log an event

class Log:
    def __init__(self,
                 data,
                 topic1=None,
                 topic2=None,
                 topic3=None,
                 topic4=None):
        
        self.data = data
        self.topic1 = topic1
        self.topic2 = topic2
        self.topic3 = topic3
        self.topic4 = topic4

    def __str__(self): return f"Log: {self.data}"

def calc_gas(topic_count, size, memory_expansion_cost=0):
    # 375 := static_gas
    return 375 * topic_count + 8 * size + memory_expansion_cost

def log0(evm):
    offset, size = evm.stack.pop(), evm.stack.pop()

    data = evm.memory.access(offset, size)
    log = Log(data)
    evm.append_log(log)

    evm.pc += 1
    evm.gas_dec(calc_gas(0, size)) # TODO: memory expansion cost

def log1(evm):
    offset, size = evm.stack.pop(), evm.stack.pop()
    topic = evm.stack.pop().value

    data = evm.memory.access(offset, size)
    log = Log(data, topic)
    evm.append_log(log)

    evm.pc += 1
    evm.gas_dec(calc_gas(1, size)) # TODO: memory expansion cost

def log2(evm):
    offset, size = evm.stack.pop(), evm.stack.pop()
    topic1, topic2 = evm.stack.pop(), evm.stack.pop()

    data = evm.memory.access(offset, size)
    log = Log(data, topic1, topic2)
    evm.append_log(log)

    evm.pc += 1
    evm.gas_dec(calc_gas(2, size)) # TODO: memory expansion cost

def log3(evm):
    offset, size = evm.stack.pop(), evm.stack.pop()
    topic1 = evm.stack.pop()
    topic2 = evm.stack.pop()
    topic3 = evm.stack.pop()

    data = evm.memory.access(offset, size)
    log = Log(data, topic1, topic2, topic3)
    evm.append_log(log)

    evm.pc += 1
    evm.gas_dec(calc_gas(3, size)) # TODO: memory expansion cost

def log4(cpu):
    offset, size = evm.stack.pop(), evm.stack.pop()
    topic1 = evm.stack.pop()
    topic2 = evm.stack.pop()
    topic3 = evm.stack.pop()
    topic4 = evm.stack.pop()

    data = evm.memory.access(offset, size)
    log = Log(data, topic1, topic2, topic3, topic4)
    evm.append_log(log)

    evm.pc += 1
    evm.gas_dec(calc_gas(4, size)) # TODO: memory expansion cost