padreug
ca2ce1dfcc
Updates the expense tracking system to store payables and receivables in fiat currency within Beancount. This ensures accurate debt representation and simplifies balance calculations. Changes include: - Converting `format_expense_entry` and `format_receivable_entry` to use fiat amounts. - Introducing `format_net_settlement_entry` for net settlement payments. - Modifying `format_payment_entry` to use cost syntax for fiat tracking. - Adjusting Fava client to correctly process new amount formats and metadata. - Adding average cost basis posting format The use of fiat amounts and cost basis aims to provide better accuracy and compatibility with existing Beancount workflows.
703 lines
22 KiB
Python
703 lines
22 KiB
Python
"""
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Format Castle entries as Beancount transactions for Fava API.
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All entries submitted to Fava must follow Beancount syntax.
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This module converts Castle data models to Fava API format.
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Key concepts:
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- Amounts are strings: "200000 SATS" or "100.00 EUR"
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- Cost basis syntax: "200000 SATS {100.00 EUR}"
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- Flags: "*" (cleared), "!" (pending), "#" (flagged), "?" (unknown)
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- Entry type: "t": "Transaction" (required by Fava)
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"""
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from datetime import date, datetime
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from decimal import Decimal
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from typing import Any, Dict, List, Optional
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def format_transaction(
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date_val: date,
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flag: str,
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narration: str,
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postings: List[Dict[str, Any]],
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payee: str = "",
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tags: Optional[List[str]] = None,
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links: Optional[List[str]] = None,
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meta: Optional[Dict[str, Any]] = None
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) -> Dict[str, Any]:
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"""
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Format a transaction for Fava's add_entries API.
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Args:
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date_val: Transaction date
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flag: Beancount flag (* = cleared, ! = pending, # = flagged)
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narration: Description
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postings: List of posting dicts (formatted by format_posting)
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payee: Optional payee
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tags: Optional tags (e.g., ["expense-entry", "approved"])
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links: Optional links (e.g., ["castle-abc123", "^invoice-xyz"])
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meta: Optional transaction metadata
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Returns:
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Fava API entry dict
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Example:
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entry = format_transaction(
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date_val=date.today(),
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flag="*",
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narration="Grocery shopping",
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postings=[
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format_posting_with_cost(
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account="Expenses:Food",
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amount_sats=36930,
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fiat_currency="EUR",
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fiat_amount=Decimal("36.93")
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),
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format_posting_with_cost(
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account="Liabilities:Payable:User-abc",
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amount_sats=-36930,
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fiat_currency="EUR",
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fiat_amount=Decimal("36.93")
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)
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],
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tags=["expense-entry"],
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links=["castle-abc123"],
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meta={"user-id": "abc123", "source": "castle-expense-entry"}
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)
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"""
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return {
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"t": "Transaction", # REQUIRED by Fava API
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"date": str(date_val),
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"flag": flag,
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"payee": payee or "", # Empty string, not None
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"narration": narration,
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"tags": tags or [],
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"links": links or [],
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"postings": postings,
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"meta": meta or {}
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}
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def format_posting_with_cost(
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account: str,
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amount_sats: int,
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fiat_currency: Optional[str] = None,
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fiat_amount: Optional[Decimal] = None,
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metadata: Optional[Dict[str, Any]] = None
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) -> Dict[str, Any]:
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"""
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Format a posting with cost basis for Fava API.
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This is the RECOMMENDED format for all Castle transactions.
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Uses Beancount's cost basis syntax to preserve exchange rates.
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IMPORTANT: Beancount cost syntax uses PER-UNIT cost, not total cost.
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This function calculates per-unit cost automatically.
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Args:
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account: Account name (e.g., "Expenses:Food:Groceries")
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amount_sats: Amount in satoshis (signed: positive = debit, negative = credit)
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fiat_currency: Fiat currency (EUR, USD, etc.)
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fiat_amount: Fiat amount TOTAL (Decimal, unsigned) - will be converted to per-unit
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metadata: Optional posting metadata
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Returns:
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Fava API posting dict
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Example:
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posting = format_posting_with_cost(
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account="Expenses:Food",
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amount_sats=200000,
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fiat_currency="EUR",
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fiat_amount=Decimal("100.00") # Total cost
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)
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# Calculates per-unit: 100.00 / 200000 = 0.0005 EUR per SAT
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# Returns: {
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# "account": "Expenses:Food",
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# "amount": "200000 SATS {0.0005 EUR}",
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# "meta": {}
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# }
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"""
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# Build amount string with cost basis
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if fiat_currency and fiat_amount and fiat_amount > 0 and amount_sats != 0:
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# Calculate per-unit cost (Beancount requires per-unit, not total)
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# Example: 1000.00 EUR / 1097994 SATS = 0.000911268 EUR per SAT
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amount_sats_abs = abs(amount_sats)
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per_unit_cost = abs(fiat_amount) / Decimal(str(amount_sats_abs))
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# Use high precision for per-unit cost (8 decimal places)
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# Cost basis syntax: "200000 SATS {0.00050000 EUR}"
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# Sign is on the sats amount, cost is always positive per-unit value
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amount_str = f"{amount_sats} SATS {{{per_unit_cost:.8f} {fiat_currency}}}"
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else:
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# No cost basis: "200000 SATS"
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amount_str = f"{amount_sats} SATS"
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# Build metadata - include total fiat amount to avoid rounding errors in balance calculations
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posting_meta = metadata or {}
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if fiat_currency and fiat_amount and fiat_amount > 0:
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# Store the exact total fiat amount as metadata
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# This preserves the original amount exactly, avoiding rounding errors from per-unit calculations
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posting_meta["fiat-amount-total"] = f"{abs(fiat_amount):.2f}"
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posting_meta["fiat-currency"] = fiat_currency
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return {
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"account": account,
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"amount": amount_str,
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"meta": posting_meta
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}
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def format_posting_at_average_cost(
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account: str,
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amount_sats: int,
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cost_currency: Optional[str] = None,
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metadata: Optional[Dict[str, Any]] = None
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) -> Dict[str, Any]:
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"""
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Format a posting to reduce at average cost for Fava API.
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Use this for payments/settlements to reduce positions at average cost.
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Specifying the cost currency tells Beancount which lots to reduce.
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Args:
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account: Account name
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amount_sats: Amount in satoshis (signed)
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cost_currency: Currency of the original cost basis (e.g., "EUR")
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metadata: Optional posting metadata
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Returns:
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Fava API posting dict
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Example:
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posting = format_posting_at_average_cost(
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account="Assets:Receivable:User-abc",
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amount_sats=-996896,
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cost_currency="EUR"
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)
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# Returns: {
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# "account": "Assets:Receivable:User-abc",
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# "amount": "-996896 SATS {EUR}",
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# "meta": {}
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# }
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# Beancount will automatically reduce EUR balance proportionally
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"""
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# Cost currency specification: "996896 SATS {EUR}"
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# This reduces positions with EUR cost at average cost
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from loguru import logger
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if cost_currency:
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amount_str = f"{amount_sats} SATS {{{cost_currency}}}"
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logger.info(f"format_posting_at_average_cost: Generated amount_str='{amount_str}' with cost_currency='{cost_currency}'")
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else:
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# No cost
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amount_str = f"{amount_sats} SATS {{}}"
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logger.warning(f"format_posting_at_average_cost: cost_currency is None, using empty cost basis")
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posting_meta = metadata or {}
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return {
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"account": account,
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"amount": amount_str,
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"meta": posting_meta
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}
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def format_posting_simple(
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account: str,
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amount_sats: int,
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metadata: Optional[Dict[str, Any]] = None
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) -> Dict[str, Any]:
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"""
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Format a simple posting (SATS only, no cost basis).
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Use this for:
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- Lightning payments (no fiat conversion)
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- SATS-only transactions
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- Internal transfers
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Args:
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account: Account name
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amount_sats: Amount in satoshis (signed)
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metadata: Optional posting metadata
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Returns:
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Fava API posting dict
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Example:
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posting = format_posting_simple(
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account="Assets:Bitcoin:Lightning",
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amount_sats=200000
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)
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# Returns: {
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# "account": "Assets:Bitcoin:Lightning",
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# "amount": "200000 SATS",
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# "meta": {}
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# }
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"""
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return {
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"account": account,
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"amount": f"{amount_sats} SATS",
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"meta": metadata or {}
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}
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def format_expense_entry(
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user_id: str,
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expense_account: str,
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user_account: str,
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amount_sats: int,
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description: str,
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entry_date: date,
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is_equity: bool = False,
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fiat_currency: Optional[str] = None,
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fiat_amount: Optional[Decimal] = None,
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reference: Optional[str] = None
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) -> Dict[str, Any]:
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"""
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Format an expense entry for submission to Fava.
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Creates a pending transaction (flag="!") that requires admin approval.
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Stores payables in EUR (or other fiat) as this is the actual debt amount.
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SATS amount stored as metadata for reference.
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Args:
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user_id: User ID
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expense_account: Expense account name (e.g., "Expenses:Food:Groceries")
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user_account: User's liability/equity account name
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amount_sats: Amount in satoshis (for reference/metadata)
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description: Entry description
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entry_date: Date of entry
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is_equity: Whether this is an equity contribution
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fiat_currency: Fiat currency (EUR, USD) - REQUIRED
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fiat_amount: Fiat amount (unsigned) - REQUIRED
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reference: Optional reference (invoice ID, etc.)
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Returns:
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Fava API entry dict
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Example:
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entry = format_expense_entry(
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user_id="abc123",
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expense_account="Expenses:Food:Groceries",
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user_account="Liabilities:Payable:User-abc123",
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amount_sats=200000,
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description="Grocery shopping",
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entry_date=date.today(),
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fiat_currency="EUR",
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fiat_amount=Decimal("100.00")
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)
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"""
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fiat_amount_abs = abs(fiat_amount) if fiat_amount else None
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if not fiat_currency or not fiat_amount_abs:
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raise ValueError("fiat_currency and fiat_amount are required for expense entries")
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# Build narration
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narration = description
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narration += f" ({fiat_amount_abs:.2f} {fiat_currency})"
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# Build postings in EUR (debts are in operating currency)
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postings = [
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{
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"account": expense_account,
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"amount": f"{fiat_amount_abs:.2f} {fiat_currency}",
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"meta": {"sats-equivalent": str(abs(amount_sats))}
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},
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{
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"account": user_account,
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"amount": f"-{fiat_amount_abs:.2f} {fiat_currency}",
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"meta": {"sats-equivalent": str(abs(amount_sats))}
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}
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]
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# Build entry metadata
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entry_meta = {
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"user-id": user_id,
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"source": "castle-api",
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"sats-amount": str(abs(amount_sats))
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}
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# Build links
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links = []
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if reference:
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links.append(reference)
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# Build tags
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tags = ["expense-entry"]
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if is_equity:
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tags.append("equity-contribution")
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return format_transaction(
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date_val=entry_date,
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flag="!", # Pending approval
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narration=narration,
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postings=postings,
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tags=tags,
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links=links,
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meta=entry_meta
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)
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def format_receivable_entry(
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user_id: str,
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revenue_account: str,
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receivable_account: str,
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amount_sats: int,
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description: str,
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entry_date: date,
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fiat_currency: Optional[str] = None,
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fiat_amount: Optional[Decimal] = None,
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reference: Optional[str] = None
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) -> Dict[str, Any]:
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"""
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Format a receivable entry (user owes castle).
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Creates a pending transaction that starts as receivable.
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Args:
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user_id: User ID
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revenue_account: Revenue account name
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receivable_account: User's receivable account name (Assets:Receivable:User-{id})
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amount_sats: Amount in satoshis (unsigned)
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description: Entry description
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entry_date: Date of entry
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fiat_currency: Optional fiat currency
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fiat_amount: Optional fiat amount (unsigned)
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reference: Optional reference
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Returns:
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Fava API entry dict
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"""
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fiat_amount_abs = abs(fiat_amount) if fiat_amount else None
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if not fiat_currency or not fiat_amount_abs:
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raise ValueError("fiat_currency and fiat_amount are required for receivable entries")
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narration = description
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narration += f" ({fiat_amount_abs:.2f} {fiat_currency})"
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# Build postings in EUR (debts are in operating currency)
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postings = [
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{
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"account": receivable_account,
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"amount": f"{fiat_amount_abs:.2f} {fiat_currency}",
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"meta": {"sats-equivalent": str(abs(amount_sats))}
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},
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{
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"account": revenue_account,
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"amount": f"-{fiat_amount_abs:.2f} {fiat_currency}",
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"meta": {"sats-equivalent": str(abs(amount_sats))}
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}
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]
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entry_meta = {
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"user-id": user_id,
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"source": "castle-api",
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"sats-amount": str(abs(amount_sats))
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}
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links = []
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if reference:
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links.append(reference)
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return format_transaction(
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date_val=entry_date,
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flag="*", # Receivables are immediately cleared (approved)
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narration=narration,
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postings=postings,
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tags=["receivable-entry"],
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links=links,
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meta=entry_meta
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)
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def format_payment_entry(
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user_id: str,
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payment_account: str,
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payable_or_receivable_account: str,
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amount_sats: int,
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description: str,
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entry_date: date,
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is_payable: bool = True,
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fiat_currency: Optional[str] = None,
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fiat_amount: Optional[Decimal] = None,
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payment_hash: Optional[str] = None,
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reference: Optional[str] = None
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) -> Dict[str, Any]:
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"""
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Format a payment entry (Lightning payment recorded).
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Creates a cleared transaction (flag="*") since payment already happened.
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Args:
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user_id: User ID
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payment_account: Payment method account (e.g., "Assets:Bitcoin:Lightning")
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payable_or_receivable_account: User's account being settled
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amount_sats: Amount in satoshis (unsigned)
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description: Payment description
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entry_date: Date of payment
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is_payable: True if castle paying user (payable), False if user paying castle (receivable)
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fiat_currency: Optional fiat currency
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fiat_amount: Optional fiat amount (unsigned)
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payment_hash: Lightning payment hash
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reference: Optional reference
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Returns:
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Fava API entry dict
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"""
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amount_sats_abs = abs(amount_sats)
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fiat_amount_abs = abs(fiat_amount) if fiat_amount else None
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# For payment settlements with fiat tracking, use cost syntax with per-unit cost
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# This allows Beancount to match against existing lots and reduce them
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# The per-unit cost is calculated from: fiat_amount / sats_amount
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# Example: 908.44 EUR / 996896 SATS = 0.000911268 EUR/SAT (matches original receivable rate)
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if fiat_currency and fiat_amount_abs and amount_sats_abs > 0:
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if is_payable:
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# Castle paying user: DR Payable, CR Lightning
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postings = [
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format_posting_with_cost(
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account=payable_or_receivable_account,
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amount_sats=amount_sats_abs,
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fiat_currency=fiat_currency,
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fiat_amount=fiat_amount_abs # Will be converted to per-unit cost
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),
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format_posting_simple(
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account=payment_account,
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amount_sats=-amount_sats_abs,
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metadata={"payment-hash": payment_hash} if payment_hash else None
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)
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]
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else:
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# User paying castle: DR Lightning, CR Receivable
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postings = [
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format_posting_simple(
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account=payment_account,
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amount_sats=amount_sats_abs,
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metadata={"payment-hash": payment_hash} if payment_hash else None
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),
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format_posting_with_cost(
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account=payable_or_receivable_account,
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amount_sats=-amount_sats_abs,
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fiat_currency=fiat_currency,
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fiat_amount=fiat_amount_abs # Will be converted to per-unit cost
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)
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]
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else:
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# No fiat tracking, use simple postings
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if is_payable:
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postings = [
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format_posting_simple(account=payable_or_receivable_account, amount_sats=amount_sats_abs),
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format_posting_simple(account=payment_account, amount_sats=-amount_sats_abs,
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metadata={"payment-hash": payment_hash} if payment_hash else None)
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]
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else:
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postings = [
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format_posting_simple(account=payment_account, amount_sats=amount_sats_abs,
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metadata={"payment-hash": payment_hash} if payment_hash else None),
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format_posting_simple(account=payable_or_receivable_account, amount_sats=-amount_sats_abs)
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]
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# Note: created-via is redundant with #lightning-payment tag
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# Note: payer/payee can be inferred from transaction direction and accounts
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entry_meta = {
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"user-id": user_id,
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"source": "lightning_payment"
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}
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if payment_hash:
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entry_meta["payment-hash"] = payment_hash
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|
|
|
links = []
|
|
if reference:
|
|
links.append(reference)
|
|
if payment_hash:
|
|
links.append(f"ln-{payment_hash[:16]}")
|
|
|
|
return format_transaction(
|
|
date_val=entry_date,
|
|
flag="*", # Cleared (payment already happened)
|
|
narration=description,
|
|
postings=postings,
|
|
tags=["lightning-payment"],
|
|
links=links,
|
|
meta=entry_meta
|
|
)
|
|
|
|
|
|
def format_net_settlement_entry(
|
|
user_id: str,
|
|
payment_account: str,
|
|
receivable_account: str,
|
|
payable_account: str,
|
|
amount_sats: int,
|
|
net_fiat_amount: Decimal,
|
|
total_receivable_fiat: Decimal,
|
|
total_payable_fiat: Decimal,
|
|
fiat_currency: str,
|
|
description: str,
|
|
entry_date: date,
|
|
payment_hash: Optional[str] = None,
|
|
reference: Optional[str] = None
|
|
) -> Dict[str, Any]:
|
|
"""
|
|
Format a net settlement payment entry (user paying net balance).
|
|
|
|
Creates a three-posting transaction:
|
|
1. Lightning payment in SATS with @@ total price notation
|
|
2. Clear receivables in EUR
|
|
3. Clear payables in EUR
|
|
|
|
Example:
|
|
Assets:Bitcoin:Lightning 565251 SATS @@ 517.00 EUR
|
|
Assets:Receivable:User -555.00 EUR
|
|
Liabilities:Payable:User 38.00 EUR
|
|
= 517 - 555 + 38 = 0 ✓
|
|
|
|
Args:
|
|
user_id: User ID
|
|
payment_account: Payment account (e.g., "Assets:Bitcoin:Lightning")
|
|
receivable_account: User's receivable account
|
|
payable_account: User's payable account
|
|
amount_sats: SATS amount paid
|
|
net_fiat_amount: Net fiat amount (receivable - payable)
|
|
total_receivable_fiat: Total receivables to clear
|
|
total_payable_fiat: Total payables to clear
|
|
fiat_currency: Currency (EUR, USD)
|
|
description: Payment description
|
|
entry_date: Date of payment
|
|
payment_hash: Lightning payment hash
|
|
reference: Optional reference
|
|
|
|
Returns:
|
|
Fava API entry dict
|
|
"""
|
|
# Build postings for net settlement
|
|
postings = [
|
|
{
|
|
"account": payment_account,
|
|
"amount": f"{abs(amount_sats)} SATS @@ {abs(net_fiat_amount):.2f} {fiat_currency}",
|
|
"meta": {"payment-hash": payment_hash} if payment_hash else {}
|
|
},
|
|
{
|
|
"account": receivable_account,
|
|
"amount": f"-{abs(total_receivable_fiat):.2f} {fiat_currency}",
|
|
"meta": {"sats-equivalent": str(abs(amount_sats))}
|
|
},
|
|
{
|
|
"account": payable_account,
|
|
"amount": f"{abs(total_payable_fiat):.2f} {fiat_currency}",
|
|
"meta": {}
|
|
}
|
|
]
|
|
|
|
entry_meta = {
|
|
"user-id": user_id,
|
|
"source": "lightning_payment",
|
|
"payment-type": "net-settlement"
|
|
}
|
|
|
|
if payment_hash:
|
|
entry_meta["payment-hash"] = payment_hash
|
|
|
|
links = []
|
|
if reference:
|
|
links.append(reference)
|
|
if payment_hash:
|
|
links.append(f"ln-{payment_hash[:16]}")
|
|
|
|
return format_transaction(
|
|
date_val=entry_date,
|
|
flag="*", # Cleared (payment already happened)
|
|
narration=description,
|
|
postings=postings,
|
|
tags=["lightning-payment", "net-settlement"],
|
|
links=links,
|
|
meta=entry_meta
|
|
)
|
|
|
|
|
|
def format_revenue_entry(
|
|
payment_account: str,
|
|
revenue_account: str,
|
|
amount_sats: int,
|
|
description: str,
|
|
entry_date: date,
|
|
fiat_currency: Optional[str] = None,
|
|
fiat_amount: Optional[Decimal] = None,
|
|
reference: Optional[str] = None
|
|
) -> Dict[str, Any]:
|
|
"""
|
|
Format a revenue entry (castle receives payment directly).
|
|
|
|
Creates a cleared transaction (flag="*") since payment was received.
|
|
|
|
Example: Cash sale, Lightning payment received, bank transfer received.
|
|
|
|
Args:
|
|
payment_account: Payment method account (e.g., "Assets:Bitcoin:Lightning", "Assets:Cash")
|
|
revenue_account: Revenue account name (e.g., "Income:Sales", "Income:Services")
|
|
amount_sats: Amount in satoshis (unsigned)
|
|
description: Entry description
|
|
entry_date: Date of payment
|
|
fiat_currency: Optional fiat currency
|
|
fiat_amount: Optional fiat amount (unsigned)
|
|
reference: Optional reference
|
|
|
|
Returns:
|
|
Fava API entry dict
|
|
|
|
Example:
|
|
entry = format_revenue_entry(
|
|
payment_account="Assets:Cash",
|
|
revenue_account="Income:Sales",
|
|
amount_sats=100000,
|
|
description="Product sale",
|
|
entry_date=date.today(),
|
|
fiat_currency="EUR",
|
|
fiat_amount=Decimal("50.00")
|
|
)
|
|
"""
|
|
amount_sats_abs = abs(amount_sats)
|
|
fiat_amount_abs = abs(fiat_amount) if fiat_amount else None
|
|
|
|
narration = description
|
|
if fiat_currency and fiat_amount_abs:
|
|
narration += f" ({fiat_amount_abs:.2f} {fiat_currency})"
|
|
|
|
postings = [
|
|
format_posting_with_cost(
|
|
account=payment_account,
|
|
amount_sats=amount_sats_abs, # Positive = debit (asset increase)
|
|
fiat_currency=fiat_currency,
|
|
fiat_amount=fiat_amount_abs
|
|
),
|
|
format_posting_with_cost(
|
|
account=revenue_account,
|
|
amount_sats=-amount_sats_abs, # Negative = credit (revenue increase)
|
|
fiat_currency=fiat_currency,
|
|
fiat_amount=fiat_amount_abs
|
|
)
|
|
]
|
|
|
|
# Note: created-via is redundant with #revenue-entry tag
|
|
entry_meta = {
|
|
"source": "castle-api"
|
|
}
|
|
|
|
links = []
|
|
if reference:
|
|
links.append(reference)
|
|
|
|
return format_transaction(
|
|
date_val=entry_date,
|
|
flag="*", # Cleared (payment received)
|
|
narration=narration,
|
|
postings=postings,
|
|
tags=["revenue-entry"],
|
|
links=links,
|
|
meta=entry_meta
|
|
)
|