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scheduled_event_hook

Vinay Rawal answered on April 2, 2023 Popularity 1/10 Helpfulness 1/10

answer scheduled_event_hook

scheduled_event_hook

Comment

Carries out actions for the scheduled event type.

from datetime import datetime
from decimal import Decimal, ROUND_HALF_DOWN
from typing import Optional
from contracts_api import (
    ActivationHookArguments,
    ActivationHookResult,
    BalancesObservationFetcher,
    CustomInstruction,
    DEFAULT_ADDRESS,
    DEFAULT_ASSET,
    DefinedDateTime,
    fetch_account_data,
    NumberShape,
    Parameter,
    ParameterLevel,
    ParameterUpdatePermission,
    Phase,
    Posting,
    PostingInstructionsDirective,
    requires,
    ScheduledEvent,
    ScheduledEventHookArguments,
    ScheduledEventHookResult,
    ScheduleExpression,
    SmartContractEventType,
    TransactionCode,
    Tside,
)
api = "4.0.0"
version = "1.0.0"
tside = Tside.ASSET
data_fetchers = [
    BalancesObservationFetcher(
        fetcher_id="latest_balances",
        at=DefinedDateTime.EFFECTIVE_DATETIME,
    ),
]
parameters = [
    Parameter(
        name="daily_interest_rate",
        shape=NumberShape(min_value=Decimal("0"), max_value=Decimal("1"), step=Decimal("0.00001")),
        level=ParameterLevel.TEMPLATE,
        display_name="Interest rate (daily).",
        description="Interest rate (daily).",
        update_permission=ParameterUpdatePermission.USER_EDITABLE,
    ),
]
event_types = [
    SmartContractEventType(name="ACCRUE_INTEREST"),
]
def activation_hook(vault, hook_arguments: ActivationHookArguments):
    return ActivationHookResult(
        scheduled_events_return_value={
            "ACCRUE_INTEREST": ScheduledEvent(
                expression=ScheduleExpression(hour=0, minute=0, second=0)
            ),
        }
    )
@requires(event_type="ACCRUE_INTEREST", parameters=True)
@fetch_account_data(event_type="ACCRUE_INTEREST", balances=["latest_balances"])
def scheduled_event_hook(vault, hook_arguments: ScheduledEventHookArguments):
    event_type = hook_arguments.event_type
    effective_datetime = hook_arguments.effective_datetime
    pi_directives: list[PostingInstructionsDirective] = []
    if event_type == "ACCRUE_INTEREST":
        pi_directives.extend(_accrue_interest(vault, effective_datetime))
    if pi_directives:
        return ScheduledEventHookResult(posting_instructions_directives=pi_directives)
def _accrue_interest(vault, effective_datetime: datetime) -> list[PostingInstructionsDirective]:
    directives = []
    # Get Balance on which we accrue interest on
    accrue_balance = Decimal(
        sum(
            balance.net
            for coord, balance in vault.get_balances_observation(
                fetcher_id="latest_balances"
            ).balances
            if coord.phase in (Phase.PENDING_OUT, Phase.COMMITTED)
            and coord.account_address in (DEFAULT_ADDRESS, "ACCRUED_INCOMING", "ACCRUED_OUTGOING")
            and coord.denomination == "GBP"
            and coord.asset == DEFAULT_ASSET
        )
    )
    daily_interest_rate = Decimal(
        vault.get_parameter_timeseries(name="daily_interest_rate").latest()
    )
    interest_due = (
        (daily_interest_rate * accrue_balance)
        .copy_abs()
        .quantize(Decimal(".01"), rounding=ROUND_HALF_DOWN)
    )
    # Accrue incoming interest
    if interest_due > 0:
        posting_ins = make_internal_transfer_instructions(
            amount=interest_due,
            denomination="GBP",
            from_account_id="1",
            from_account_address="ACCRUED_OUTGOING",
            to_account_id=vault.account_id,
            to_account_address="ACCRUED_INCOMING",
            asset=DEFAULT_ASSET,
        )
        directives.append(
            PostingInstructionsDirective(
                posting_instructions=posting_ins,
                value_datetime=effective_datetime,
            )
        )
    return directives
def make_internal_transfer_instructions(
    amount: Decimal,
    denomination: str,
    from_account_id: str,
    from_account_address: str,
    to_account_id: str,
    to_account_address: str,
    asset: str = DEFAULT_ASSET,
    instruction_details: Optional[dict[str, str]] = None,
    transaction_code: Optional[TransactionCode] = None,
    override_all_restrictions: Optional[bool] = None,
)

Popularity 1/10 Helpfulness 1/10 Language python

Source: Grepper

Tags: python

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Contributed on Apr 02 2023

Vinay Rawal

0 Answers Avg Quality 2/10

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