[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed in async module

Just to leave a reminder about this bug. I know you are aware of it but the other bug that was closed was for the sync module of ccxt.

• OS: OSX
• Language: Python
• CCXT version: 1.10.443
• Exchange:kraken, bitfinex
• Method: fetch_balance() (async version)

import asyncio
import os
import sys

root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
sys.path.append(root + '/python')

import ccxt.async as ccxt  # noqa: E402


async def test(exchange):
    print(await exchange.fetch_balance())


kraken = ccxt.kraken({
    'apiKey': "hEvQNMDIeoCJbr7W/ZBb5CGOrx3G0lWF5B3zqa1JBxdZlEaL8EK+D0Mw",
    'secret': "JaE9wI6Nwgh5oRxiHcVxurwzwBxwc05W/qv/k1srGg4s3EYuXPpNkLLM5NYbbWpM8rCyijIeDavRuqWbU0ZV9A==",
    'verbose': True,  # switch it to False if you don't want the HTTP log
})
bitfinex = ccxt.bitfinex({
    'apiKey': "4FlEDtxDl35gdEiobnfZ72vJeZteE4Bb7JdvqzjIjHq",
    'secret': "D4DXM8DZdHuAq9YptUsb42aWT1XBnGlIJgLi8a7tzFH",
    'verbose': True,  # switch it to False if you don't want the HTTP log
})

[asyncio.ensure_future(test(exchange)) for exchange in [kraken, bitfinex]]
pending = asyncio.Task.all_tasks()
loop = asyncio.get_event_loop()
loop.run_until_complete(asyncio.gather(*pending))

/Users/hexdump/Developing/Python/arbitragebot/venv/bin/python /Users/hexdump/Developing/Python/arbitragebot/asyncmain.py
https://api.kraken.com/0/public/AssetPairs GET https://api.kraken.com/0/public/AssetPairs 
Request: {'Accept-Encoding': 'gzip, deflate'} None
https://api.bitfinex.com/v1/symbols_details GET https://api.bitfinex.com/v1/symbols_details 
Request: {'Accept-Encoding': 'gzip, deflate'} None
Traceback (most recent call last):
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/connector.py", line 796, in _wrap_create_connection
    return (yield from self._loop.create_connection(*args, **kwargs))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/base_events.py", line 803, in create_connection
    sock, protocol_factory, ssl, server_hostname)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/base_events.py", line 829, in _create_connection_transport
    yield from waiter
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/sslproto.py", line 503, in data_received
    ssldata, appdata = self._sslpipe.feed_ssldata(data)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/sslproto.py", line 201, in feed_ssldata
    self._sslobj.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 683, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/async/base/exchange.py", line 104, in fetch
    async with session_method(url, data=encoded_body, headers=headers, timeout=(self.timeout / 1000), proxy=self.aiohttp_proxy) as response:
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/client.py", line 690, in __aenter__
    self._resp = yield from self._coro
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/client.py", line 267, in _request
    conn = yield from self._connector.connect(req)
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/connector.py", line 402, in connect
    proto = yield from self._create_connection(req)
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/connector.py", line 748, in _create_connection
    _, proto = yield from self._create_direct_connection(req)
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/connector.py", line 859, in _create_direct_connection
    raise last_exc
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/connector.py", line 831, in _create_direct_connection
    req=req, client_error=client_error)
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/aiohttp/connector.py", line 801, in _wrap_create_connection
    raise ClientConnectorSSLError(req.connection_key, exc) from exc
aiohttp.client_exceptions.ClientConnectorSSLError: Cannot connect to host api.bitfinex.com:443 ssl:True [[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748)]

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/hexdump/Developing/Python/arbitragebot/asyncmain.py", line 29, in <module>
    loop.run_until_complete(asyncio.gather(*pending))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/asyncio/base_events.py", line 467, in run_until_complete
    return future.result()
  File "/Users/hexdump/Developing/Python/arbitragebot/asyncmain.py", line 12, in test
    print(await exchange.fetch_balance())
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/async/bitfinex.py", line 280, in fetch_balance
    await self.load_markets()
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/async/base/exchange.py", line 126, in load_markets
    markets = await self.fetch_markets()
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/async/bitfinex.py", line 238, in fetch_markets
    markets = await self.publicGetSymbolsDetails()
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/async/bitfinex.py", line 646, in request
    response = await self.fetch2(path, api, method, params, headers, body)
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/async/base/exchange.py", line 84, in fetch2
    return await self.fetch(request['url'], request['method'], request['headers'], request['body'])
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/async/base/exchange.py", line 115, in fetch
    self.raise_error(ExchangeError, url, method, e, None)
  File "/Users/hexdump/Developing/Python/arbitragebot/venv/lib/python3.6/site-packages/ccxt/base/exchange.py", line 271, in raise_error
    details,
ccxt.base.errors.ExchangeError: bitfinex GET https://api.bitfinex.com/v1/symbols_details Cannot connect to host api.bitfinex.com:443 ssl:True [[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:748)] 

Process finished with exit code 1

[kroitor]

Not very easy to find an adequate implementation of python-requests in an async environment… But as a temporary workaround you can do the following:

1. Install certifi with pip3 install certifi

2. Get the path of the new cert.pem CA file from certifi:

   python -c "import certifi; print(certifi.where())"
   

3. Get default system path for old CA files:

   python -c "import ssl; print(ssl.get_default_verify_paths())"
   

4. Copy (or replace) the CA file from path 2 to path 3.

[jochem-brouwer]

Hey, I had a similiar issue, and fixed it by updating requests.

pip install --upgrade requests