SpringBoot MongoDB: how to find the CLOSEST POSITIVE DIFF document? - mongodb

Question

Considering a collection with the following documents:
[{
"_id" : ObjectId("5f984d04093a1a0be1237db2"),
"postalCode" : "",
"latitude" : -33.4939994812012,
"longitude" : 143.210403442383,
"accuracyRadius" : 1000,
"network" : "1.0.0.0/24",
"geoNameID" : 2077456,
"registeredCountryGeoNameID" : 2077456,
"anonymousProxy" : false,
"satelliteProvider" : false,
"_class" : "project.domain.maxmind.block.GeoLite2CityBlockIPv4"
},
{
"_id" : ObjectId("5f984d04093a1a0be1237db3"),
"postalCode" : "",
"latitude" : 34.7724990844727,
"longitude" : 113.726600646973,
"accuracyRadius" : 50,
"network" : "1.0.1.0/24",
"geoNameID" : 1814991,
"registeredCountryGeoNameID" : 1814991,
"anonymousProxy" : false,
"satelliteProvider" : false,
"_class" : "project.domain.maxmind.block.GeoLite2CityBlockIPv4"
},
{
"_id" : ObjectId("5f984d04093a1a0be1237db4"),
"postalCode" : "",
"latitude" : 34.7724990844727,
"longitude" : 113.726600646973,
"accuracyRadius" : 50,
"network" : "1.0.2.0/23",
"geoNameID" : 1814991,
"registeredCountryGeoNameID" : 1814991,
"anonymousProxy" : false,
"satelliteProvider" : false,
"_class" : "project.domain.maxmind.block.GeoLite2CityBlockIPv4"
}]
How can I write an efficient query for the closest network, starting from an IP address (string) as the input?
E.g. considering the network 1.0.1.0/24
and the IPv4 1.0.1.200
I should convert the IPv4 to its corresponding integer value
1.0.1.200 --> 16777672
and do the same for each network
network 1.0.0.0/24 --> 16777216
host min 1.0.0.1 --> 16777217
host max 1.0.0.254 --> 16777470
network 1.0.1.0/24 --> 16777472
host min 1.0.1.1 --> 16777473
host max 1.0.1.254 --> 16777726
network 1.0.2.0/23 --> 16777728
host min 1.0.2.1 --> 16777729
host max 1.0.3.254 --> 16778238
Then I would need to do a diff among the IP and the network to find the closest positive one:
16777672 - 16777216 = 456
16777672 - 16777472 = 200
16777672 - 16777728 = -56
How could I write such a query, considering that both the IPs and networks are Strings?
I could do just the conversion of the IP to its integer value, before passing it to the #Repository, but then I would need to convert the network addresses inside the #Query.
#Repository
public interface GeoLite2CityBlockIPv4Repository extends ReactiveMongoRepository<GeoLite2CityBlockIPv4, BigInteger>, ReactiveQuerydslPredicateExecutor<GeoLite2CityBlockIPv4> {
Mono<GeoLite2CityBlockIPv4> findOneByNetwork(String network);
#Query("{?}")
Mono<GeoLite2CityBlockIPv4> findOneByIP(Integer ip);
}