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65 lines
1.7 KiB
Python
65 lines
1.7 KiB
Python
from datetime import datetime
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from matplotlib import pyplot as plt
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from chart.function.gen_unique_name import generate_unique_name
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from ..database.server import create_pool
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async def create_chart(from_currency: str, conv_currency: str, start_date: str, end_date: str) -> (str, None):
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pool = await create_pool()
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if not validate_date(start_date) or not validate_date(end_date):
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return None
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start_date_obj = datetime.strptime(start_date, '%Y-%m-%d').date()
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end_date_obj = datetime.strptime(end_date, '%Y-%m-%d').date()
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async with pool.acquire() as conn:
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data = await conn.fetch(
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'SELECT date, rate FROM currency '
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'WHERE (date BETWEEN $1 AND $2) AND from_currency = $3 AND conv_currency = $4',
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start_date_obj,
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end_date_obj,
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from_currency.upper(),
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conv_currency.upper()
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)
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if not data or len(data) <= 1:
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return None
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date, rate = [], []
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for row in data:
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date.append(str(row['date']))
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rate.append(row['rate'])
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if rate[0] < rate[-1]:
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plt.plot(date, rate, color='green', marker='o')
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elif rate[0] > rate[-1]:
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plt.plot(date, rate, color='red', marker='o')
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else:
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plt.plot(date, rate, color='grey')
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plt.xlabel('Date')
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plt.ylabel('Rate')
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fig = plt.gcf()
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fig.set_size_inches(18.5, 9.5)
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name = await generate_unique_name(
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f'{from_currency.upper()}_{conv_currency.upper()}',
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datetime.now()
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)
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fig.savefig(f'../charts/{name}.png')
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fig.clear()
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return name
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def validate_date(date_str: str) -> bool:
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try:
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datetime.strptime(date_str, '%Y-%m-%d')
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return True
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except ValueError:
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return False
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