pymongo.errors.ConfigurationError: Resolver configuration could not be read or specified no nameservers.

Penguin Master

Hello, I'm trying to use PyMongo on Pythonista, and I got the link and all that right, but I'm getting this error:


Traceback (most recent call last):
  File "/private/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/spike-bot 4/main.py", line 34, in <module>
    db = pymongo.MongoClient("mongodb+srv://spike-bot:password@spike-db.bpn5m.mongodb.net/spike-db?retryWrites=true&w=majority")
  File "/private/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/spike-bot 4/pymongo/mongo_client.py", line 641, in __init__
    connect_timeout=timeout)
  File "/private/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/spike-bot 4/pymongo/uri_parser.py", line 500, in parse_uri
    nodes = dns_resolver.get_hosts()
  File "/private/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/spike-bot 4/pymongo/srv_resolver.py", line 102, in get_hosts
    _, nodes = self._get_srv_response_and_hosts(True)
  File "/private/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/spike-bot 4/pymongo/srv_resolver.py", line 83, in _get_srv_response_and_hosts
    results = self._resolve_uri(encapsulate_errors)
  File "/private/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/spike-bot 4/pymongo/srv_resolver.py", line 79, in _resolve_uri
    raise ConfigurationError(str(exc))
pymongo.errors.ConfigurationError: Resolver configuration could not be read or specified no nameservers.

thanks

JonB

I gather it is complaining about the uri format (mongodb+srv://). Maybe try with just the host name?

Penguin Master

@JonB Host name?

ccc

import platform
print(platform.node())

Penguin Master

@JonB OK, I tried putting the host name, but it gives an error. I also tried doing mongodb:// instead of mongodb+srv:// but then it wouldnt connect. Any other ideas?

Penguin Master

@JonB also, the it needs to start with mongodb+srv:// or mongodb:// or it will say that it needs to be one of those

JonB

Ok, in second look, the issue seems to be dnspython. You should test whether dnspython works at all on pythonista. Try using it standalone.

You may be able to shim the dns resolver stuff, and just monkey patch to hard code whatever is expected...

JonB

indeed, the problem is that dnspython tries to open /etc/resolv.conf, which is forbidden on iOS.

luckily, dns.resolver lets you skip configuration, and configure the default resolver manually. so, the following should work -- do this before importing pymongo

import dns.resolver
dns.resolver.default_resolver=dns.resolver.Resolver(configure=False)
dns.resolver.default_resolver.nameservers=['8.8.8.8'] # this is a google public dns server,  use whatever dns server you like here
# as a test, dns.resolver.query('www.google.com') should return an answer, not an exception

Just adde this code to the top of your main code, and that should be sufficient to get you past this hurdle..

Penguin Master

@JonB thank you so much! It works perfectly!