errors.py

#
# Copyright 2015 Quantopian, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from textwrap import dedent

from zipline.utils.memoize import lazyval


class ZiplineError(Exception):
    msg = None

    def __init__(self, **kwargs):
        self.kwargs = kwargs

    @lazyval
    def message(self):
        return str(self)

    def __str__(self):
        msg = self.msg.format(**self.kwargs)
        return msg

    __unicode__ = __str__
    __repr__ = __str__


class NoTradeDataAvailable(ZiplineError):
    pass


class NoTradeDataAvailableTooEarly(NoTradeDataAvailable):
    msg = "{sid} does not exist on {dt}. It started trading on {start_dt}."


class NoTradeDataAvailableTooLate(NoTradeDataAvailable):
    msg = "{sid} does not exist on {dt}. It stopped trading on {end_dt}."


class BenchmarkAssetNotAvailableTooEarly(NoTradeDataAvailableTooEarly):
    pass


class BenchmarkAssetNotAvailableTooLate(NoTradeDataAvailableTooLate):
    pass


class InvalidBenchmarkAsset(ZiplineError):
    msg = """
{sid} cannot be used as the benchmark because it has a stock \
dividend on {dt}.  Choose another asset to use as the benchmark.
""".strip()


class WrongDataForTransform(ZiplineError):
    """
    Raised whenever a rolling transform is called on an event that
    does not have the necessary properties.
    """
    msg = "{transform} requires {fields}. Event cannot be processed."


class UnsupportedSlippageModel(ZiplineError):
    """
    Raised if a user script calls the set_slippage magic
    with a slipage object that isn't a VolumeShareSlippage or
    FixedSlipapge
    """
    msg = """
You attempted to set slippage with an unsupported class. \
Please use VolumeShareSlippage or FixedSlippage.
""".strip()


class SetSlippagePostInit(ZiplineError):
    # Raised if a users script calls set_slippage magic
    # after the initialize method has returned.
    msg = """
You attempted to set slippage outside of `initialize`. \
You may only call 'set_slippage' in your initialize method.
""".strip()


class SetCancelPolicyPostInit(ZiplineError):
    # Raised if a users script calls set_cancel_policy
    # after the initialize method has returned.
    msg = """
You attempted to set the cancel policy outside of `initialize`. \
You may only call 'set_cancel_policy' in your initialize method.
""".strip()


class RegisterTradingControlPostInit(ZiplineError):
    # Raised if a user's script register's a trading control after initialize
    # has been run.
    msg = """
You attempted to set a trading control outside of `initialize`. \
Trading controls may only be set in your initialize method.
""".strip()


class RegisterAccountControlPostInit(ZiplineError):
    # Raised if a user's script register's a trading control after initialize
    # has been run.
    msg = """
You attempted to set an account control outside of `initialize`. \
Account controls may only be set in your initialize method.
""".strip()


class UnsupportedCommissionModel(ZiplineError):
    """
    Raised if a user script calls the set_commission magic
    with a commission object that isn't a PerShare, PerTrade or
    PerDollar commission
    """
    msg = """
You attempted to set commission with an unsupported class. \
Please use PerShare or PerTrade.
""".strip()


class UnsupportedCancelPolicy(ZiplineError):
    """
    Raised if a user script calls set_cancel_policy with an object that isn't
    a CancelPolicy.
    """
    msg = """
You attempted to set the cancel policy with an unsupported class.  Please use
an instance of CancelPolicy.
""".strip()


class SetCommissionPostInit(ZiplineError):
    """
    Raised if a users script calls set_commission magic
    after the initialize method has returned.
    """
    msg = """
You attempted to override commission outside of `initialize`. \
You may only call 'set_commission' in your initialize method.
""".strip()


class TransactionWithNoVolume(ZiplineError):
    """
    Raised if a transact call returns a transaction with zero volume.
    """
    msg = """
Transaction {txn} has a volume of zero.
""".strip()


class TransactionWithWrongDirection(ZiplineError):
    """
    Raised if a transact call returns a transaction with a direction that
    does not match the order.
    """
    msg = """
Transaction {txn} not in same direction as corresponding order {order}.
""".strip()


class TransactionWithNoAmount(ZiplineError):
    """
    Raised if a transact call returns a transaction with zero amount.
    """
    msg = """
Transaction {txn} has an amount of zero.
""".strip()


class TransactionVolumeExceedsOrder(ZiplineError):
    """
    Raised if a transact call returns a transaction with a volume greater than
the corresponding order.
    """
    msg = """
Transaction volume of {txn} exceeds the order volume of {order}.
""".strip()


class UnsupportedOrderParameters(ZiplineError):
    """
    Raised if a set of mutually exclusive parameters are passed to an order
    call.
    """
    msg = "{msg}"


class CannotOrderDelistedAsset(ZiplineError):
    """
    Raised if an order is for a delisted asset.
    """
    msg = "{msg}"


class BadOrderParameters(ZiplineError):
    """
    Raised if any impossible parameters (nan, negative limit/stop)
    are passed to an order call.
    """
    msg = "{msg}"


class OrderDuringInitialize(ZiplineError):
    """
    Raised if order is called during initialize()
    """
    msg = "{msg}"


class SetBenchmarkOutsideInitialize(ZiplineError):
    """
    Raised if set_benchmark is called outside initialize()
    """
    msg = "'set_benchmark' can only be called within initialize function."


class AccountControlViolation(ZiplineError):
    """
    Raised if the account violates a constraint set by a AccountControl.
    """
    msg = """
Account violates account constraint {constraint}.
""".strip()


class TradingControlViolation(ZiplineError):
    """
    Raised if an order would violate a constraint set by a TradingControl.
    """
    msg = """
Order for {amount} shares of {asset} at {datetime} violates trading constraint
{constraint}.
""".strip()


class IncompatibleHistoryFrequency(ZiplineError):
    """
    Raised when a frequency is given to history which is not supported.
    At least, not yet.
    """
    msg = """
Requested history at frequency '{frequency}' cannot be created with data
at frequency '{data_frequency}'.
""".strip()


class HistoryInInitialize(ZiplineError):
    """
    Raised when an algorithm calls history() in initialize.
    """
    msg = "history() should only be called in handle_data()"


class OrderInBeforeTradingStart(ZiplineError):
    """
    Raised when an algorithm calls an order method in before_trading_start.
    """
    msg = "Cannot place orders inside before_trading_start."


class MultipleSymbolsFound(ZiplineError):
    """
    Raised when a symbol() call contains a symbol that changed over
    time and is thus not resolvable without additional information
    provided via as_of_date.
    """
    msg = """
Multiple symbols with the name '{symbol}' found. Use the
as_of_date' argument to to specify when the date symbol-lookup
should be valid.

Possible options: {options}
    """.strip()


class SymbolNotFound(ZiplineError):
    """
    Raised when a symbol() call contains a non-existant symbol.
    """
    msg = """
Symbol '{symbol}' was not found.
""".strip()


class RootSymbolNotFound(ZiplineError):
    """
    Raised when a lookup_future_chain() call contains a non-existant symbol.
    """
    msg = """
Root symbol '{root_symbol}' was not found.
""".strip()


class SidsNotFound(ZiplineError):
    """
    Raised when a retrieve_asset() or retrieve_all() call contains a
    non-existent sid.
    """
    @lazyval
    def plural(self):
        return len(self.sids) > 1

    @lazyval
    def sids(self):
        return self.kwargs['sids']

    @lazyval
    def msg(self):
        if self.plural:
            return "No assets found for sids: {sids}."
        return "No asset found for sid: {sids[0]}."


class EquitiesNotFound(SidsNotFound):
    """
    Raised when a call to `retrieve_equities` fails to find an asset.
    """
    @lazyval
    def msg(self):
        if self.plural:
            return "No equities found for sids: {sids}."
        return "No equity found for sid: {sids[0]}."


class FutureContractsNotFound(SidsNotFound):
    """
    Raised when a call to `retrieve_futures_contracts` fails to find an asset.
    """
    @lazyval
    def msg(self):
        if self.plural:
            return "No future contracts found for sids: {sids}."
        return "No future contract found for sid: {sids[0]}."


class ConsumeAssetMetaDataError(ZiplineError):
    """
    Raised when AssetFinder.consume() is called on an invalid object.
    """
    msg = """
AssetFinder can not consume metadata of type {obj}. Metadata must be a dict, a
DataFrame, or a tables.Table. If the provided metadata is a Table, the rows
must contain both or one of 'sid' or 'symbol'.
""".strip()


class MapAssetIdentifierIndexError(ZiplineError):
    """
    Raised when AssetMetaData.map_identifier_index_to_sids() is called on an
    index of invalid objects.
    """
    msg = """
AssetFinder can not map an index with values of type {obj}. Asset indices of
DataFrames or Panels must be integer sids, string symbols, or Asset objects.
""".strip()


class SidAssignmentError(ZiplineError):
    """
    Raised when an AssetFinder tries to build an Asset that does not have a sid
    and that AssetFinder is not permitted to assign sids.
    """
    msg = """
AssetFinder metadata is missing a SID for identifier '{identifier}'.
""".strip()


class NoSourceError(ZiplineError):
    """
    Raised when no source is given to the pipeline
    """
    msg = """
No data source given.
""".strip()


class PipelineDateError(ZiplineError):
    """
    Raised when only one date is passed to the pipeline
    """
    msg = """
Only one simulation date given. Please specify both the 'start' and 'end' for
the simulation, or neither. If neither is given, the start and end of the
DataSource will be used. Given start = '{start}', end = '{end}'
""".strip()


class WindowLengthTooLong(ZiplineError):
    """
    Raised when a trailing window is instantiated with a lookback greater than
    the length of the underlying array.
    """
    msg = (
        "Can't construct a rolling window of length "
        "{window_length} on an array of length {nrows}."
    ).strip()


class WindowLengthNotPositive(ZiplineError):
    """
    Raised when a trailing window would be instantiated with a length less than
    1.
    """
    msg = (
        "Expected a window_length greater than 0, got {window_length}."
    ).strip()


class NonWindowSafeInput(ZiplineError):
    """
    Raised when a Pipeline API term that is not deemed window safe is specified
    as an input to another windowed term.

    This is an error because it's generally not safe to compose windowed
    functions on split/dividend adjusted data.
    """
    msg = (
        "Can't compute windowed expression {parent} with "
        "windowed input {child}."
    )


class TermInputsNotSpecified(ZiplineError):
    """
    Raised if a user attempts to construct a term without specifying inputs and
    that term does not have class-level default inputs.
    """
    msg = "{termname} requires inputs, but no inputs list was passed."


class TermOutputsEmpty(ZiplineError):
    """
    Raised if a user attempts to construct a term with an empty outputs list.
    """
    msg = (
        "{termname} requires at least one output when passed an outputs "
        "argument."
    )


class InvalidOutputName(ZiplineError):
    """
    Raised if a term's output names conflict with any of its attributes.
    """
    msg = (
        "{output_name!r} cannot be used as an output name for {termname}. "
        "Output names cannot start with an underscore or be contained in the "
        "following list: {disallowed_names}."
    )


class WindowLengthNotSpecified(ZiplineError):
    """
    Raised if a user attempts to construct a term without specifying window
    length and that term does not have a class-level default window length.
    """
    msg = (
        "{termname} requires a window_length, but no window_length was passed."
    )


class InvalidTermParams(ZiplineError):
    """
    Raised if a user attempts to construct a Term using ParameterizedTermMixin
    without specifying a `params` list in the class body.
    """
    msg = (
        "Expected a list of strings as a class-level attribute for "
        "{termname}.params, but got {value} instead."
    )


class DTypeNotSpecified(ZiplineError):
    """
    Raised if a user attempts to construct a term without specifying dtype and
    that term does not have class-level default dtype.
    """
    msg = (
        "{termname} requires a dtype, but no dtype was passed."
    )


class NotDType(ZiplineError):
    """
    Raised when a pipeline Term is constructed with a dtype that isn't a numpy
    dtype object.
    """
    msg = (
        "{termname} expected a numpy dtype "
        "object for a dtype, but got {dtype} instead."
    )


class UnsupportedDType(ZiplineError):
    """
    Raised when a pipeline Term is constructed with a dtype that's not
    supported.
    """
    msg = (
        "Failed to construct {termname}.\n"
        "Pipeline terms of dtype {dtype} are not yet supported."
    )


class BadPercentileBounds(ZiplineError):
    """
    Raised by API functions accepting percentile bounds when the passed bounds
    are invalid.
    """
    msg = (
        "Percentile bounds must fall between 0.0 and 100.0, and min must be "
        "less than max."
        "\nInputs were min={min_percentile}, max={max_percentile}."
    )


class UnknownRankMethod(ZiplineError):
    """
    Raised during construction of a Rank factor when supplied a bad Rank
    method.
    """
    msg = (
        "Unknown ranking method: '{method}'. "
        "`method` must be one of {choices}"
    )


class AttachPipelineAfterInitialize(ZiplineError):
    """
    Raised when a user tries to call add_pipeline outside of initialize.
    """
    msg = (
        "Attempted to attach a pipeline after initialize()."
        "attach_pipeline() can only be called during initialize."
    )


class PipelineOutputDuringInitialize(ZiplineError):
    """
    Raised when a user tries to call `pipeline_output` during initialize.
    """
    msg = (
        "Attempted to call pipeline_output() during initialize. "
        "pipeline_output() can only be called once initialize has completed."
    )


class NoSuchPipeline(ZiplineError, KeyError):
    """
    Raised when a user tries to access a non-existent pipeline by name.
    """
    msg = (
        "No pipeline named '{name}' exists. Valid pipeline names are {valid}. "
        "Did you forget to call attach_pipeline()?"
    )


class UnsupportedDataType(ZiplineError):
    """
    Raised by CustomFactors with unsupported dtypes.
    """
    msg = "{typename} instances with dtype {dtype} are not supported."


class NoFurtherDataError(ZiplineError):
    """
    Raised by calendar operations that would ask for dates beyond the extent of
    our known data.
    """
    # This accepts an arbitrary message string because it's used in more places
    # that can be usefully templated.
    msg = '{msg}'

    @classmethod
    def from_lookback_window(cls,
                             initial_message,
                             first_date,
                             lookback_start,
                             lookback_length):
        return cls(
            msg=dedent(
                """
                {initial_message}

                lookback window started at {lookback_start}
                earliest known date was {first_date}
                {lookback_length} extra rows of data were required
                """
            ).format(
                initial_message=initial_message,
                first_date=first_date,
                lookback_start=lookback_start,
                lookback_length=lookback_length,
            )
        )


class UnsupportedDatetimeFormat(ZiplineError):
    """
    Raised when an unsupported datetime is passed to an API method.
    """
    msg = ("The input '{input}' passed to '{method}' is not "
           "coercible to a pandas.Timestamp object.")


class PositionTrackerMissingAssetFinder(ZiplineError):
    """
    Raised by a PositionTracker if it is asked to update an Asset but does not
    have an AssetFinder
    """
    msg = (
        "PositionTracker attempted to update its Asset information but does "
        "not have an AssetFinder. This may be caused by a failure to properly "
        "de-serialize a TradingAlgorithm."
    )


class AssetDBVersionError(ZiplineError):
    """
    Raised by an AssetDBWriter or AssetFinder if the version number in the
    versions table does not match the ASSET_DB_VERSION in asset_writer.py.
    """
    msg = (
        "The existing Asset database has an incorrect version: {db_version}. "
        "Expected version: {expected_version}. Try rebuilding your asset "
        "database or updating your version of Zipline."
    )


class AssetDBImpossibleDowngrade(ZiplineError):
    msg = (
        "The existing Asset database is version: {db_version} which is lower "
        "than the desired downgrade version: {desired_version}."
    )


class HistoryWindowStartsBeforeData(ZiplineError):
    msg = (
        "History window extends before {first_trading_day}. To use this "
        "history window, start the backtest on or after {suggested_start_day}."
        )


class NonExistentAssetInTimeFrame(ZiplineError):
    msg = (
        "The target asset '{asset}' does not exist for the entire timeframe "
        "between {start_date} and {end_date}."
    )


class InvalidCalendarName(ZiplineError):
    """
    Raised when a calendar with an invalid name is requested.
    """
    msg = (
        "The requested TradingCalendar, {calendar_name}, does not exist."
    )


class CalendarNameCollision(ZiplineError):
    """
    Raised when the static calendar registry already has a calendar with a
    given name.
    """
    msg = (
        "A calendar with the name {calendar_name} is already registered."
    )


class ScheduleFunctionWithoutCalendar(ZiplineError):
    """
    Raised when schedule_function is called but there is not a calendar to be
    used in the construction of an event rule.
    """
    # TODO update message when new TradingSchedules are built
    msg = (
        "To use schedule_function, the TradingAlgorithm must be running on an "
        "ExchangeTradingSchedule, rather than {schedule}."
    )


class UnsupportedPipelineOutput(ZiplineError):
    """
    Raised when a 1D term is added as a column to a pipeline.
    """
    msg = (
        "Cannot add column {column_name!r} with term {term}. Adding slices or "
        "single-column-output terms as pipeline columns is not currently "
        "supported."
    )


class NonSliceableTerm(ZiplineError):
    """
    Raised when attempting to index into a non-sliceable term, e.g. instances
    of `zipline.pipeline.term.LoadableTerm`.
    """
    msg = "Taking slices of {term} is not currently supported."


class IncompatibleTerms(ZiplineError):
    """
    Raised when trying to compute correlations/regressions between two 2D
    factors with different masks.
    """
    msg = (
        "{term_1} and {term_2} must have the same mask in order to compute "
        "correlations and regressions asset-wise."
    )