Add geoip db (#477)

* Use geoip for ipv4 city lookup

Signed-off-by: i1i1 <vanyarybin1@live.ru>

* Add support for ipv6

Signed-off-by: i1i1 <vanyarybin1@live.ru>

* Wrap locator into a blocking task

* Dummy change to try and trigger CI pipeline.

Co-authored-by: James Wilson <james@jsdw.me>

backend/Cargo.lock

@@ -750,6 +750,15 @@ version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "68f2d64f2edebec4ce84ad108148e67e1064789bee435edc5b60ad398714a3a9"
 
+[[package]]
+name = "ipnetwork"
+version = "0.18.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4088d739b183546b239688ddbc79891831df421773df95e236daf7867866d355"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "itertools"
 version = "0.10.1"
@@ -831,6 +840,18 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
 
+[[package]]
+name = "maxminddb"
+version = "0.23.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe2ba61113f9f7a9f0e87c519682d39c43a6f3f79c2cc42c3ba3dda83b1fa334"
+dependencies = [
+ "ipnetwork",
+ "log",
+ "memchr",
+ "serde",
+]
+
 [[package]]
 name = "memchr"
 version = "2.4.0"
@@ -1613,6 +1634,7 @@ dependencies = [
  "hyper",
  "jemallocator",
  "log",
+ "maxminddb",
  "num_cpus",
  "once_cell",
  "parking_lot",