GeoIP2 Snowflake Java UDF Integration issue-CodePudding

I want to create a Java UDF in a snowflake worksheet in order to query GeoIp2 library and get the ISO code of a given IP. I have '@AWS_CSV_STAGE/lib/geoip2-2.8.0.jar','@AWS_CSV_STAGE/geodata/GeoLite2-City.mmdb' already staged. How can i direct the function handler to the method that creates the Database Reader as explained here in the documentation for Java: https://dev.maxmind.com/geoip/geolocate-an-ip/databases?lang=en#1-install-the-geoip2-client-library in general how can i achieve this whole thing below in my udf?

File database = new File("/path/to/maxmind-database.mmdb")
DatabaseReader reader = new DatabaseReader.Builder(database).build();
InetAddress ipAddress = InetAddress.getByName("128.101.101.101");
CityResponse response = reader.city(ipAddress);
Country country = response.getCountry();

so far i wrote this but of course it's not working: anyway i couldn't find much material about how to tackle this kind of problem.

CREATE OR REPLACE FUNCTION GEO()
  returns varchar not null
  language java
  imports = ('@AWS_CSV_STAGE/lib/geoip2-2.8.0.jar','@AWS_CSV_STAGE/geodata/GeoLite2-City.mmdb')
  handler = 'DatabaseReader.Builder';

SELECT GEO();

basically what i want to achieve is to call the UDF on a column of ip address table and get the country code in another column for each ip address.

CodePudding user response：

To create a Java User-Defined Function (UDF) in Snowflake, you will need to use the CREATE FUNCTION statement in Snowflake SQL. The syntax for this statement is as follows:

CREATE OR REPLACE FUNCTION function_name
RETURNS data_type
LANGUAGE JAVA
IMPORTS = ('file_path_1', 'file_path_2', ...)
HANDLER = 'fully_qualified_class_name.method_name'

In your case, you can use the following CREATE FUNCTION statement to create your UDF:

CREATE OR REPLACE FUNCTION GEO
RETURNS VARCHAR
LANGUAGE JAVA
IMPORTS = ('@AWS_CSV_STAGE/lib/geoip2-2.8.0.jar','@AWS_CSV_STAGE/geodata/GeoLite2-City.mmdb')
HANDLER = 'com.maxmind.geoip2.DatabaseReader.Builder'

SELECT GEO(ip_address_column) AS country_code
FROM ip_addresses

This query will use the GEO UDF to get the country code for each IP address in the ip_addresses table, and return the country code in a new country_code column.

CodePudding user response：

In order to create a Java UDF in Snowflake, create a Java class that defines the UDF function and its behavior. This class should include the code that you provided to create the DatabaseReader and query the GeoIP2 database to get the ISO code for a given IP address.

Once this class is defined, use the CREATE OR REPLACE FUNCTION statement in Snowflake to register the function and make it available for use in your queries. The IMPORTS clause of the CREATE OR REPLACE FUNCTION statement is used to specify the external JAR files that your function depends on, such as the GeoIP2 library JAR file that you mentioned.

Here is an example of how your CREATE OR REPLACE FUNCTION statement might look:

CREATE OR REPLACE FUNCTION GEO(ipAddress VARCHAR)
RETURNS VARCHAR
LANGUAGE JAVA
IMPORTS ('@AWS_CSV_STAGE/lib/geoip2-2.8.0.jar','@AWS_CSV_STAGE/geodata/GeoLite2-City.mmdb')
HANDLER 'com.example.GeoIpFunction'

In this example, com.example.GeoIpFunction is the fully qualified name of the Java class that you defined to implement your function. To use the function in a query call it like any other Snowflake function, and pass in the IP address as an argument:

SELECT GEO('128.101.101.101')

This would return the ISO code for the specified IP address. Also use this function in a query to get the ISO code for each IP address in a column of a table:

SELECT GEO(ip_address) AS iso_code FROM my_table