Re: [syslog-ng] syslog-ng Digest, Vol 206, Issue 2

10 Jun 2022

      i'm not sure that *format-flat-json* works with lists same as with nested
dicts.
My example uses format-flat-json, but without an additional filter on
pothon, I was unable to flatten it
There is original message

{
	"operation": "CLIENT_RESPONSE",
	"identity": "ns-server.example.com",
	"family": "INET",
	"protocol": "TCP",
	"query-ip": "192.168.xx.zz",
	"query-port": "51000",
	"response-ip": "192.168.yy.zz",
	"response-port": "53",
	"length": 691,
	"rcode": "NOERROR",
	"qname": "_dnsaddr.bootstrap.libp2p.io",
	"qtype": "TXT",
	"latency": "0.000000",
	"timestamp-rfc3339": "2022-06-06T08:47:58.797332215Z",
	"answers": [{
		"name": "_dnsaddr.bootstrap.libp2p.io",
		"rdatatype": "TXT",
		"ttl": 600,
		"rdata": "dnsaddr=/dnsaddr/ams-2.bootstrap.libp2p.io/p2p/QmbLHAnMoJPWSCR5Zhtx6BHJX9KiKNN6tpvbUcqanj75Nb"
	}, {
		"name": "_dnsaddr.bootstrap.libp2p.io",
		"rdatatype": "TXT",
		"ttl": 600,
		"rdata": "dnsaddr=/dnsaddr/sjc-1.bootstrap.libp2p.io/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN"
	}, {
		"name": "_dnsaddr.bootstrap.libp2p.io",
		"rdatatype": "TXT",
		"ttl": 600,
		"rdata": "dnsaddr=/dnsaddr/ewr-1.bootstrap.libp2p.io/p2p/QmQCU2EcMqAqQPR2i9bChDtGNJchTbq5TbXJJ16u19uLTa"
	}, {
		"name": "_dnsaddr.bootstrap.libp2p.io",
		"rdatatype": "TXT",
		"ttl": 600,
		"rdata": "dnsaddr=/dnsaddr/ams-rust.bootstrap.libp2p.io/p2p/12D3KooWEZXjE41uU4EL2gpkAQeDXYok6wghN7wwNVPF5bwkaNfS"
	}, {
		"name": "_dnsaddr.bootstrap.libp2p.io",
		"rdatatype": "TXT",
		"ttl": 600,
		"rdata": "dnsaddr=/dnsaddr/sjc-2.bootstrap.libp2p.io/p2p/QmZa1sAxajnQjVM8WjWXoMbmPd7NsWhfKsPkErzpm9wGkp"
	}, {
		"name": "_dnsaddr.bootstrap.libp2p.io",
		"rdatatype": "TXT",
		"ttl": 600,
		"rdata": "dnsaddr=/dnsaddr/nrt-1.bootstrap.libp2p.io/p2p/QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt"
	}],
	"country-isocode": "-"
}

I would be very grateful to you if you have a solution using the built-in
functions of syslog-ng.

пт, 10 июн. 2022 г. в 15:00, <syslog-ng-request@lists.balabit.hu>:
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Today's Topics:
1.  need help with parser to make flat nested json list of
      dictionaries (????????? ???????????)
   2. Re:  need help with parser to make flat nested json list of
      dictionaries (Peter Kokai (pkokai))
----------------------------------------------------------------------
Message: 1
Date: Fri, 10 Jun 2022 11:02:55 +0300
From: ????????? ???????????  <alexander.a.maslennikov@gmail.com>
To: syslog-ng@lists.balabit.hu
Subject: [syslog-ng] need help with parser to make flat nested json
        list of dictionaries
Message-ID:
        <CA+G0nAjp1b6_50LbCROVPje1_B4R_AzNYiZ-_dT0m=
fXcqwmHA@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
hi all
i have a json message that contains a nested json list of dicts
{"a":1,"b":[{"c":1},{"c":2},{"c":3}]}
i want to flat that message, so expected result looks like {
"a": 1,
"b_0_c": 1,
"b_1_c": 2,
"b_2_c": 3
}
My approach is a python implemented parser.
Is it possible to achieve the same result using the built-in syslog-ng
tools?
My solution below
@define kafka-implementation kafka-c
python {
import collections
import json
class FlattenedJson(object):
def parse(self, log_message, flat_message=None):
        def flatten(d, parent_key='', sep='_'):
            items = []
            for k, v in d.items():
                new_key = parent_key + sep + k if parent_key else k
                if isinstance(v, collections.MutableMapping):
                    items.extend(flatten(v, new_key, sep=sep).items())
                elif isinstance(v, list):
                    for idx, value in enumerate(v):
                        items.extend(flatten(value, new_key + sep +
str(idx), sep).items())
                else:
                    items.append((new_key, v))
            return dict(items)
        try:
            decoded_msg =
json.loads(log_message['MESSAGE'].decode('utf-8'))
            flat_message = flatten(decoded_msg)
            final_message =
str(json.dumps(flat_message)).encode(encoding='utf-8')
            log_message['MESSAGE'] = final_message
        except Exception as error:
            log_message['python_error'] = 'An exception occurred:
{}'.format(error)
        return True
};
destination d_kafka_dnstap {
  kafka(
    topic("mytopic")
    bootstrap-servers("localhost:9092")
    message("$(format-flat-json  --scope all-nv-pairs
application_name=myapp @timestamp=${ISODATE} )")
  );
};
source s_net_dnstap { network( transport(udp) port(514) flags(no-parse) );
};
parser p_dnstap { channel {
    parser { python(class("FlattenedJson")); };
    parser { json-parser(prefix("dnstap.")); };
  };
};
log { source(s_net_dnstap); parser(p_dnstap); destination(d_kafka_dnstap);
};

Re: [syslog-ng] syslog-ng Digest, Vol 206, Issue 2

Александр Масленников