prices.py

# Copyright (c) 2022 Graham Lea
#
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import logging
from datetime import date
from typing import List, Iterable, Union

import amberelectric
from amberelectric.api import AmberApi
from amberelectric.model.actual_interval import ActualInterval
from amberelectric.model.current_interval import CurrentInterval
from amberelectric.model.forecast_interval import ForecastInterval

from util import chunked, date_stream


def stream_price_data(client: AmberApi, site_id: str, start_date: date, end_date: date) -> Iterable[ActualInterval]:
    """
    Uses the given client to query the Amber API for all Prices data for the specified Site between the given dates
    (both inclusive), and returns a generator that streams Price Interval objects.
    """
    # Do requests in batches. API couldn't handle large responses in testing. (2021-09-11)
    for date_range in chunked(date_stream(start_date, end_date), 20):
        batch_start = date_range[0]
        batch_end = date_range[-1]
        try:
            logging.info(f"Retrieving prices: {batch_start} -> {batch_end}")
            price_records: List[Union[ActualInterval, CurrentInterval, ForecastInterval]] = \
                client.get_prices(site_id, start_date=batch_start, end_date=batch_end)
            logging.info("    Done")
            for pr in price_records:
                if isinstance(pr, ActualInterval):
                    yield pr
        except amberelectric.ApiException as ex:
            raise RuntimeError(f"We failed to retrieve your Amber prices because of an error: {ex}") from ex