When working with microservices, you will find yourself with various apps that need users to select a country or a city.

There are a lot of providers for such services out there, this however is an in-house solution that you can spin in a couple of seconds.

The dataset is based on Juanmah's work, but slightly striped.

• create an azure function app in Azure.
• read the csv.
• respond with the requested data.

1. clone repository.
2. create a dotnet (3.1 we are still waiting for 6) Function App in azure.
3. pulbish to function to the above function.
   1. When publishing make sure the option "run from a package" is false or 0. This makes wwwroot folder in Kudu readonly as the docs state.
   2. Create a folder, "Data" , using Kudu in the wwwwroot folder of the function.
   3. Upload your csv file to the Data folder in Kudu.
4. test your function.

1. without parameter country you will get a list of all countries in the world.
2. with a paramter you will get a list of cities in that given country.

1. Is the data upto date? Yes, cities take time to form. If a city is missing please let me know so that I can update the dataset.
2. Can the data be improved Yes, if the need arises we could add support for continent and other related data.
3. How is the performance? It is just fine, check the response times in the pictures above.
4. I want a faster response, can that be done? Yes, strip the file and remove fields that you don't need.
5. Kudu cannot gives me a ERROR 409 Conflict ! Set WEBSITE_RUN_FROM_PACKAGE to 0 in your function app configuration in Azure. This app service feature makes the wwwroot folder readonly as referenced above.
6. Well my local solution is not working ! Azure and a local development enviromrmnt have diffirent file structures, for debugging puposes change the root directory line to : var rootDirectory = Path.GetFullPath(Path.Combine(binDirectory, "..","..","..",".."));