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post_posting_hook

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

answer post_posting_hook

post_posting_hook

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Carries out actions after deciding on whether to accept a batch of posting instructions in the pre_posting_hook hook.

This hook is called after the accepted posting instructions were inserted into the Vault posting ledger.

For a product that wants to rebalance postings (for example, a product with credit lines), rebalancing would be done here.

from contracts_api import (
    BalanceCoordinate,
    CustomInstruction,
    DEFAULT_ADDRESS,
    DEFAULT_ASSET,
    DefinedDateTime,
    fetch_account_data,
    Phase,
    Posting,
    PostingInstructionsDirective,
    PostingsIntervalFetcher,
    PostPostingHookArguments,
    PostPostingHookResult,
    RelativeDateTime,
    Shift,
    Tside,
)
api = "4.0.0"
version = "1.0.0"
tside = Tside.LIABILITY
data_fetchers = [
    PostingsIntervalFetcher(
        fetcher_id="month_of_postings",
        start=RelativeDateTime(shift=Shift(months=-1), origin=DefinedDateTime.EFFECTIVE_TIME),
    ),
]
@fetch_account_data(postings=["month_of_postings"])
def post_posting_hook(vault, hook_arguments: PostPostingHookArguments):
    new_posting_instructions = hook_arguments.posting_instructions
    new_posting_instructions_balances = sum(
        (posting_instruction.balances() for posting_instruction in new_posting_instructions)
    )
    historic_posting_instructions = vault.get_posting_instructions(fetcher_id="month_of_postings")
    historic_posting_instructions_balances = sum(
        [pi.balances() for pi in historic_posting_instructions]
    )
    pending_in_coordinate = BalanceCoordinate(
        account_address=DEFAULT_ADDRESS,
        asset=DEFAULT_ASSET,
        denomination="GBP",
        phase=Phase.PENDING_IN,
    )
    new_net_balance_in = new_posting_instructions_balances[pending_in_coordinate].net
    historic_net_balance_in = historic_posting_instructions_balances[pending_in_coordinate].net
    # If the amount coming in is greater than some savings threshold, transfer the remainder to a separate fund
    savings_threshold = _calculate_savings_threshold(historic_net_balance_in)
    if new_net_balance_in > savings_threshold:
        posting_instruction_directive = PostingInstructionsDirective(
            value_datetime=hook_arguments.effective_datetime,
            client_batch_id=vault.get_hook_execution_id(),
            posting_instructions=[
                CustomInstruction(
                    postings=[
                        Posting(
                            credit=False,
                            amount=new_net_balance_in-savings_threshold,
                            denomination="GBP",
                            account_id=vault.account_id,
                            account_address=DEFAULT_ADDRESS,
                            asset=DEFAULT_ASSET,
                            phase=Phase.COMMITTED,
                        ),
                        Posting(
                            credit=True,
                            amount=new_net_balance_in-savings_threshold,
                            denomination="GBP",
                            account_id=vault.account_id,
                            account_address="PLAN_C_FUNDS",
                            asset=DEFAULT_ASSET,
                            phase=Phase.COMMITTED,
                        ),
                    ],
                    instruction_details={
                        "instruction_identifier_key": vault.account_id,
                    },
                )
            ],
        )
        return PostPostingHookResult(
            posting_instructions_directives=[posting_instruction_directive],
        )

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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