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How to use resolve_hostname method in localstack

Best Python code snippet using localstack_python

update_mdns_test.py

Source:update_mdns_test.py

1from update_mdns import process_event2import subprocess3import time4def resolve_hostname(hostname):5    result = subprocess.run(["avahi-resolve-host-name", "-4", "-n", hostname], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, input="Hello from the other side")6    if result.returncode != 0 or result.stderr.startswith('Fail'):7        return None8    return result.stdout.rstrip().split()[1]9# Add service with no public ip10process_event({11    "type":"ADDED",12    "object":{13        "metadata":{14            "uid":"cedfd733-0b43-433c-b5dd-844efde8d0f1"15        },16        "status":{"loadBalancer":{}}17    }18})19time.sleep(5)20# Modified service with hostname but no public ip21process_event({22    "type":"MODIFIED",23    "object":{24        "metadata":{25            "uid":"cedfd733-0b43-433c-b5dd-844efde8d0f1",26            "annotations": {27                "mdns.johntrimble.com/hostname": "billybob779.local"28            }29        },30        "status":{"loadBalancer":{}}31    }32})33time.sleep(5)34assert resolve_hostname("billybob779.local") is None35# Modified so we now have an IP address36process_event({37    "type":"MODIFIED",38    "object":{39        "metadata":{40            "uid":"cedfd733-0b43-433c-b5dd-844efde8d0f1",41            "annotations": {42                "mdns.johntrimble.com/hostname": "billybob779.local"43            }44        },45        "status":{"loadBalancer":{"ingress":[{"ip":"192.168.0.199"}]}}46    }47})48time.sleep(5)49assert resolve_hostname("billybob779.local") == "192.168.0.199"50# Change hostname51process_event({52    "type":"MODIFIED",53    "object":{54        "metadata":{55            "uid":"cedfd733-0b43-433c-b5dd-844efde8d0f1",56            "annotations": {57                "mdns.johntrimble.com/hostname": "frank779.local"58            }59        },60        "status":{"loadBalancer":{"ingress":[{"ip":"192.168.0.199"}]}}61    }62})63time.sleep(5)64assert resolve_hostname("billybob779.local") is None65assert resolve_hostname("frank779.local") == "192.168.0.199"66# Change IP address67process_event({68    "type":"MODIFIED",69    "object":{70        "metadata":{71            "uid":"cedfd733-0b43-433c-b5dd-844efde8d0f1",72            "annotations": {73                "mdns.johntrimble.com/hostname": "frank779.local"74            }75        },76        "status":{"loadBalancer":{"ingress":[{"ip":"192.168.0.198"}]}}77    }78})79time.sleep(10)80assert resolve_hostname("frank779.local") == "192.168.0.198"81# Remove service82process_event({83    "type":"DELETED",84    "object":{85        "metadata":{86            "uid":"cedfd733-0b43-433c-b5dd-844efde8d0f1",87            "annotations": {88                "mdns.johntrimble.com/hostname": "frank779.local"89            }90        },91        "status":{"loadBalancer":{"ingress":[{"ip":"192.168.0.198"}]}}92    }93})94time.sleep(5)...

dnsmail.py

Source:dnsmail.py

...6"""78import argparse,dns.resolver910def resolve_hostname(hostname, indent=''):11    "Print an A or AAAA record for `hostname`; follow CNAMEs if necessary."12    indent = indent + ' '13    answer = dns.resolver.query(hostname, 'A')14    if answer.rrset is not None:15        for record in answer:16            print(indent, hostname, 'has A address', record.address)17        return18    answer = dns.resolver.query(hostname, 'AAAA')19    20    if answer.rrset is not None:21        for record in answer:22            print(indent, hostname, 'has AAAA address', record.address)23        return24    answer = dns.resolver.query(hostname, 'CNAME')25    if answer.rrset is not None:26        record = answer[0]27        cname = record.address28        print(indent, hostname, 'is a CNAME alias for', cname) #?29        resolve_hostname(cname, indent)30        return31    print(indent, 'ERROR: no A, AAAA, or CNAME records for', hostname)32    33def resolve_email_domain(domain):34    "For an email address `name@domain` find its mail server IP addresses."35    try:36        answer = dns.resolver.query(domain, 'MX', raise_on_no_answer=False)37    except dns.resolver.NXDOMAIN:38        print('Error: No such domain', domain)39        return40    if answer.rrset is not None:41        records = sorted(answer, key=lambda record: record.preference)42        for record in records:43            name = record.exchange.to_text(omit_final_dot=True)44            print('Priority', record.preference)45            resolve_hostname(name)46    else:47        print('This domain has no explicit MX records')48        print('Attempting to resolve it as an A, AAAA, or CNAME')49        resolve_hostname(domain)50        51if __name__ == '__main__':52    parser = argparse.ArgumentParser(description='Find mailserver IP address')53    parser.add_argument('domain', help='domain that you want to send mail to')54    resolve_email_domain(parser.parse_args().domain)55    56    
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test_net_utils.py

Source:test_net_utils.py

2from localstack.constants import LOCALHOST3from localstack.utils.common import short_uid4from localstack.utils.net import resolve_hostname5@pytest.mark.skip_offline6def test_resolve_hostname():7    assert "127." in resolve_hostname(LOCALHOST)8    assert resolve_hostname("example.com")...

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