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virtual_machines.py
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virtual_machines.py
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from flask import (Blueprint, current_app, request, flash,
redirect, url_for, render_template)
import pulumi
import pulumi_aws as aws
import pulumi.automation as auto
import os
from pathlib import Path
bp = Blueprint("virtual_machines", __name__, url_prefix="/vms")
instance_types = ['c5.xlarge', 'p2.xlarge', 'p3.2xlarge']
def create_pulumi_program(keydata: str, instance_type=str):
# Choose the latest minimal amzn2 Linux AMI.
# TODO: Make this something the user can choose.
ami = aws.ec2.get_ami(most_recent=True,
owners=["amazon"],
filters=[aws.GetAmiFilterArgs(name="name", values=["*amzn2-ami-minimal-hvm*"])])
group = aws.ec2.SecurityGroup('web-secgrp',
description='Enable SSH access',
ingress=[aws.ec2.SecurityGroupIngressArgs(
protocol='tcp',
from_port=22,
to_port=22,
cidr_blocks=['0.0.0.0/0'],
)])
public_key = keydata
if public_key is None or public_key == "":
home = str(Path.home())
f = open(os.path.join(home, '.ssh/id_rsa.pub'), 'r')
public_key = f.read()
f.close()
public_key = public_key.strip()
print(f"Public Key: '{public_key}'\n")
keypair = aws.ec2.KeyPair("dlami-keypair", public_key=public_key)
server = aws.ec2.Instance('dlami-server',
instance_type=instance_type,
vpc_security_group_ids=[group.id],
key_name=keypair.id,
ami=ami.id)
pulumi.export('instance_type', server.instance_type)
pulumi.export('public_key', keypair.public_key)
pulumi.export('public_ip', server.public_ip)
pulumi.export('public_dns', server.public_dns)
@bp.route("/new", methods=["GET", "POST"])
def create_vm():
"""creates new VM"""
if request.method == "POST":
stack_name = request.form.get("vm-id")
keydata = request.form.get("vm-keypair")
instance_type = request.form.get("instance_type")
def pulumi_program():
return create_pulumi_program(keydata, instance_type)
try:
# create a new stack, generating our pulumi program on the fly from the POST body
stack = auto.create_stack(
stack_name=str(stack_name),
project_name=current_app.config["PROJECT_NAME"],
program=pulumi_program,
)
stack.set_config("aws:region", auto.ConfigValue("us-east-1"))
# deploy the stack, tailing the logs to stdout
stack.up(on_output=print)
flash(
f"Successfully created VM '{stack_name}'", category="success")
except auto.StackAlreadyExistsError:
flash(
f"Error: VM with name '{stack_name}' already exists, pick a unique name",
category="danger",
)
return redirect(url_for("virtual_machines.list_vms"))
current_app.logger.info(f"Instance types: {instance_types}")
return render_template("virtual_machines/create.html", instance_types=instance_types, curr_instance_type=None)
@bp.route("/", methods=["GET"])
def list_vms():
"""lists all vms"""
vms = []
org_name = current_app.config["PULUMI_ORG"]
project_name = current_app.config["PROJECT_NAME"]
try:
ws = auto.LocalWorkspace(
project_settings=auto.ProjectSettings(
name=project_name, runtime="python")
)
all_stacks = ws.list_stacks()
for stack in all_stacks:
stack = auto.select_stack(
stack_name=stack.name,
project_name=project_name,
# no-op program, just to get outputs
program=lambda: None,
)
outs = stack.outputs()
if 'public_dns' in outs:
vms.append(
{
"name": stack.name,
"dns_name": f"{outs['public_dns'].value}",
"console_url": f"https://app.pulumi.com/{org_name}/{project_name}/{stack.name}",
}
)
except Exception as exn:
flash(str(exn), category="danger")
current_app.logger.info(f"VMS: {vms}")
return render_template("virtual_machines/index.html", vms=vms)
@bp.route("/<string:id>/update", methods=["GET", "POST"])
def update_vm(id: str):
stack_name = id
if request.method == "POST":
current_app.logger.info(
f"Updating VM: {stack_name}, form data: {request.form}")
keydata = request.form.get("vm-keypair")
current_app.logger.info(f"updating keydata: {keydata}")
instance_type = request.form.get("instance_type")
def pulumi_program():
return create_pulumi_program(keydata, instance_type)
try:
stack = auto.select_stack(
stack_name=stack_name,
project_name=current_app.config["PROJECT_NAME"],
program=pulumi_program,
)
stack.set_config("aws:region", auto.ConfigValue("us-east-1"))
# deploy the stack, tailing the logs to stdout
stack.up(on_output=print)
flash(f"VM '{stack_name}' successfully updated!",
category="success")
except auto.ConcurrentUpdateError:
flash(
f"Error: VM '{stack_name}' already has an update in progress",
category="danger",
)
except Exception as exn:
flash(str(exn), category="danger")
return redirect(url_for("virtual_machines.list_vms"))
stack = auto.select_stack(
stack_name=stack_name,
project_name=current_app.config["PROJECT_NAME"],
# noop just to get the outputs
program=lambda: None,
)
outs = stack.outputs()
public_key = outs.get("public_key")
pk = public_key.value if public_key else None
instance_type = outs.get("instance_type")
return render_template("virtual_machines/update.html", name=stack_name, public_key=pk, instance_types=instance_types, curr_instance_type=instance_type.value)
@bp.route("/<string:id>/delete", methods=["POST"])
def delete_vm(id: str):
stack_name = id
try:
stack = auto.select_stack(
stack_name=stack_name,
project_name=current_app.config["PROJECT_NAME"],
# noop program for destroy
program=lambda: None,
)
stack.destroy(on_output=print)
stack.workspace.remove_stack(stack_name)
flash(f"VM '{stack_name}' successfully deleted!", category="success")
except auto.ConcurrentUpdateError:
flash(
f"Error: VM '{stack_name}' already has update in progress",
category="danger",
)
except Exception as exn:
flash(str(exn), category="danger")
return redirect(url_for("virtual_machines.list_vms"))