From 90c1717b6b87c4ddbc7dde9a0e63f789bedd7cc4 Mon Sep 17 00:00:00 2001
From: Redume <danilivasenko09@gmail.com>
Date: Wed, 8 Jan 2025 22:52:12 +0300
Subject: [PATCH] refactor(convert): Rewrote the requests to aiohttp. Reverted
 the old query algorithm, first kekkai, then ddg

---
 functions/convert.py | 74 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 functions/convert.py

diff --git a/functions/convert.py b/functions/convert.py
new file mode 100644
index 0000000..7c18700
--- /dev/null
+++ b/functions/convert.py
@@ -0,0 +1,74 @@
+from utils.format_number import format_number
+
+import yaml
+
+import aiohttp
+import json
+import re
+
+from datetime import datetime
+from http import HTTPStatus
+from decimal import Decimal, ROUND_DOWN
+from utils.format_number import format_number
+
+config = yaml.safe_load(open('config.yaml'))
+
+class Converter:
+    def __init__(self):
+        self.amount: float = 1.0
+        self.conv_amount: float = 0.0
+        self.from_currency: str = ''
+        self.conv_currency: str = ''
+    
+    async def convert(self) -> None:
+        if not await self.kekkai():
+            await self.ddg()
+
+        number = Decimal(str(self.conv_amount))
+        self.conv_amount = format_number(number.quantize(Decimal('1.0000'), rounding=ROUND_DOWN))
+
+
+    async def kekkai(self) -> bool:
+        date = datetime.today().strftime('%Y-%m-%d')
+
+        async with aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=3)) as session:
+            async with session.get(f'{config['kekkai_instance']}/api/getRate/', params={
+                'from_currency': self.from_currency,
+                'conv_currency': self.conv_currency,
+                'date': date,
+                'conv_amount': self.amount
+            },
+            timeout=3) as res:
+                if not HTTPStatus(res.status).is_success:
+                    return False
+
+                data = await res.json()
+                self.conv_amount = data.get('conv_amount', 0.0)
+
+                return True
+
+
+    async def ddg(self) -> None:
+        async with aiohttp.ClientSession(timeout=aiohttp.ClientTimeout(total=3)) as session:
+            async with session.get(
+                'https://duckduckgo.com/js/spice/currency/'
+                f'{self.amount}/{self.from_currency}/{self.conv_currency}'
+                ) as res:
+
+                data_text = await res.text()
+            
+                data = json.loads(re.findall(r'\(\s*(.*)\s*\);$', data_text)[0])
+
+                for key in ['terms', 'privacy', 'timestamp']:
+                    data.pop(key, None)
+
+                if len(data.get('to')) == 0:
+                    raise RuntimeError('Failed to get the exchange rate from DuckDuckGo')
+
+                conv = data.get('to')[0]
+                conv_amount = conv.get('mid')
+
+                if conv_amount is None:
+                    raise RuntimeError('Error when converting currency via DuckDuckGo')
+
+                self.conv_amount = float(conv_amount)