exceptions.py

import datetime
import time


class BadFunctionCallOutput(Exception):
    """
    We failed to decode ABI output.

    Most likely ABI mismatch.
    """
    pass


class BlockNumberOutofRange(Exception):
    '''
    block_identifier passed does not match known block.
    '''
    pass


class CannotHandleRequest(Exception):
    """
    Raised by a provider to signal that it cannot handle an RPC request and
    that the manager should proceed to the next provider.
    """
    pass


class InvalidAddress(ValueError):
    """
    The supplied address does not have a valid checksum, as defined in EIP-55
    """
    pass


class NameNotFound(ValueError):
    """
    Raised when a caller provides an Ethereum Name Service name that
    does not resolve to an address.
    """
    pass


class StaleBlockchain(Exception):
    """
    Raised by the stalecheck_middleware when the latest block is too old.
    """
    def __init__(self, block, allowable_delay):
        last_block_date = datetime.datetime.fromtimestamp(block.timestamp).strftime('%c')
        message = (
            "The latest block, #%d, is %d seconds old, but is only allowed to be %d s old. "
            "The date of the most recent block is %s. Continue syncing and try again..." %
            (block.number, time.time() - block.timestamp, allowable_delay, last_block_date)
        )
        super().__init__(message, block, allowable_delay)

    def __str__(self):
        return self.args[0]


class UnhandledRequest(Exception):
    """
    Raised by the manager when none of it's providers responds to a request.
    """
    pass


class MismatchedABI(Exception):
    """
    Raised when an ABI does not match with supplied parameters, or when an
    attempt is made to access a function/event that does not exist in the ABI.
    """
    pass


class FallbackNotFound(Exception):
    """
    Raised when fallback function doesn't exist in contract.
    """
    pass


class ValidationError(Exception):
    """
    Raised when a supplied value is invalid.
    """
    pass


class NoABIFunctionsFound(AttributeError):
    """
    Raised when an ABI doesn't contain any functions.
    """
    pass


class NoABIEventsFound(AttributeError):
    """
    Raised when an ABI doesn't contain any events.
    """
    pass


class InsufficientData(Exception):
    """
    Raised when there are insufficient data points to
    complete a calculation
    """
    pass