Macro rusoto_ec2::filter

macro_rules! filter {
    ($key:expr) => { ... };
    ($key:expr, $($value:expr),+) => { ... };
}

Filter structure is a bit verbose to set up, and since it is used in many places filter! macro provides an ergononic way of creating it. filter! expects its arguments to be ToString. The first argument is the name field of the Filter, while the rest of them (if any) become the values.

Filter structure is used in various Ec2Client::describe_*() calls.

For example:

let filter = filter!("region-name", "us-east-1");
let input = DescribeAvailabilityZonesRequest {
    filters: Some(vec![filter]),
    ..DescribeAvailabilityZonesRequest::default()
};

let output = Ec2Client::new(Region::default())
    .describe_availability_zones(input)
    .await?;

let empty = filter!("empty");
let direct = rusoto_ec2::Filter {
    name: Some(String::from("empty")),
    values: Some(vec![])
};

assert_eq!(empty, direct);

let single = filter!("owner", "bozo");
let direct = rusoto_ec2::Filter {
    name: Some(String::from("owner")),
    values: Some(vec![String::from("bozo")])
};

assert_eq!(single, direct);

let list = filter!("groups", "sg-xxxxx", "sg-yyyyy");
let direct = rusoto_ec2::Filter {
    name: Some(String::from("groups")),
    values: Some(
        vec![
            String::from("sg-xxxxx"),
            String::from("sg-yyyyy"),
        ])
};

assert_eq!(list, direct);