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const fetchUser: (id: string) => IO<User> = 
    id => new IO(effects => effects.findById(id));

const notifyUser: (user: User) => IO<void> = 
    id => new IO(effects => effects.notify(user));

const exampleFunc: (id: string) => IO<void> = _do(function* (id) {
  const user: User = yield fetchUser(id);
  yield notifyUser(user);
  log.info('User has been notified')

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export class IO<A>{
    private effect: Effect<A>
    constructor(effect: Effect<A>) {
        this.effect = effect
    }
    static of<T>(val: T) {
        return new IO(() => Promise.resolve(val))
    }
    
    map<B>(f: (val: A) => B): IO<B> {

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resource "aws_alb" "alb" {
  subnets = ["${aws_subnet.pub_subnet_1.id}", "${aws_subnet.pub_subnet_2.id}"]
  internal = false
  security_groups = ["${aws_security_group.alb.id}"]
  depends_on = ["aws_internet_gateway.app_igw", "aws_vpc_dhcp_options_association.dns_resolver"]
}

resource "aws_alb_target_group" "targ" {
  port = 8080
  protocol = "HTTP"

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#### EC2 INSTANCES #################

# bastion ############################
resource "aws_instance" "bastion" {
  ami = "${data.aws_ami.ubuntu.id}"
  vpc_security_group_ids = [
    "${aws_security_group.bastion.id}"
  ]
  instance_type = "${var.aws_instance_type}"
  subnet_id = "${aws_subnet.pub_subnet_1.id}"

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#provision public subnet 1
resource "aws_subnet" "pub_subnet_1"{
  
  vpc_id = "${aws_vpc.app_vpc.id}"
  cidr_block = "${var.aws_pub_subnet_1_cidr}"
  tags {
      Name = "public subnet"
  }
  availability_zone = "${data.aws_availability_zones.available.names[0]}"
}

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# WP SERVERS ############################
resource "aws_instance" "wp" {
  ami = "${data.aws_ami.ubuntu.id}"
  vpc_security_group_ids = [
    "${aws_security_group.wp.id}"
  ]
  instance_type = "${var.aws_instance_type}"
  subnet_id = "${aws_subnet.wp_subnet.id}"

  key_name = "${aws_key_pair.demo_keys.key_name}"

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#provision wordpress subnet
resource "aws_subnet" "wp_subnet" {
  vpc_id = "${aws_vpc.app_vpc.id}"
  cidr_block = "${var.aws_wp_subnet_cidr}"
  tags {
    Name = "WordPress subnet"
  }
  availability_zone = "${data.aws_availability_zones.available.names[0]}"
}

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###### provision RDS
# make db subnet group 
resource "aws_db_subnet_group" "db_subnet" {
  name       = "db_subnet"
  subnet_ids = ["${aws_subnet.db_subnet_1.id}", "${aws_subnet.db_subnet_2.id}"]
}

resource "aws_db_instance" "wp-db" {
  identifier = "wp-db"
  instance_class = "db.t2.micro"

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#### DB subnets
resource "aws_subnet" "db_subnet_1" {
  vpc_id = "${aws_vpc.app_vpc.id}"
  cidr_block = "${var.aws_db_subnet_1_cidr}"
  tags {
    Name = "WordPress subnet 1"
  }
  availability_zone = "${data.aws_availability_zones.available.names[0]}"
}

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### AWS VPC ####################################################################
# provision app vpc
resource "aws_vpc" "app_vpc" {
  cidr_block = "${var.aws_network_cidr}"
  enable_dns_support = true
  enable_dns_hostnames = true
  tags {
    Name = "WP Solution VPC"
  }
}