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#!/usr/bin/env python

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Example of using the Compute Engine API to create and delete instances.

Creates a new compute engine instance and uses it to apply a caption to

an image.

For more information, see the README.md under samples/compute.

"""

import argparse

import os

import time

import googleapiclient.discovery

# [START compute_apiary_list_instances]

def list_instances(compute, project, zone):

result = compute.instances().list(project=project, zone=zone).execute()

return result.get("items")

# [END compute_apiary_list_instances]

# [START compute_apiary_create_instance]

def create_instance(compute, project, zone, name, bucket):

# Get the latest Debian Jessie image.

image_response = (

compute.images()

.getFromFamily(project="debian-cloud", family="debian-11")

.execute()

)

source_disk_image = image_response["selfLink"]

# Configure the machine

machine_type = "zones/%s/machineTypes/n1-standard-1" % zone

startup_script = open(

os.path.join(os.path.dirname(__file__), "startup-script.sh"), "r"

).read()

image_url = "http://storage.googleapis.com/gce-demo-input/photo.jpg"

image_caption = "Ready for dessert?"

config = {

"name": name,

"machineType": machine_type,

# Specify the boot disk and the image to use as a source.

"disks": [

{

"boot": True,

"autoDelete": True,

"initializeParams": {

"sourceImage": source_disk_image,

}

# Specify a network interface with NAT to access the public

# internet.

"networkInterfaces": [

{

"network": "global/networks/default",

"accessConfigs": [{"type": "ONE_TO_ONE_NAT", "name": "External NAT"}],

}

# Allow the instance to access cloud storage and logging.

"serviceAccounts": [

{

"email": "default",

"scopes": [

"https://www.googleapis.com/auth/devstorage.read_write",

"https://www.googleapis.com/auth/logging.write",

}

# Metadata is readable from the instance and allows you to

# pass configuration from deployment scripts to instances.

"metadata": {

"items": [

{

# Startup script is automatically executed by the

# instance upon startup.

"key": "startup-script",

"value": startup_script,

{"key": "url", "value": image_url},

{"key": "text", "value": image_caption},

{"key": "bucket", "value": bucket},

]

}

return compute.instances().insert(project=project, zone=zone, body=config).execute()

# [END compute_apiary_create_instance]

# [START compute_apiary_delete_instance]

def delete_instance(compute, project, zone, name):

return (

compute.instances().delete(project=project, zone=zone, instance=name).execute()

)

# [END compute_apiary_delete_instance]

# [START compute_apiary_wait_for_operation]

def wait_for_operation(compute, project, zone, operation):

print("Waiting for operation to finish...")

while True:

result = (

compute.zoneOperations()

.get(project=project, zone=zone, operation=operation)

.execute()

)

if result["status"] == "DONE":

print("done.")

if "error" in result:

raise Exception(result["error"])

return result

time.sleep(1)

# [END compute_apiary_wait_for_operation]

# [START compute_apiary_run]

def main(project, bucket, zone, instance_name, wait=True):

compute = googleapiclient.discovery.build("compute", "v1")

print("Creating instance.")

operation = create_instance(compute, project, zone, instance_name, bucket)

wait_for_operation(compute, project, zone, operation["name"])

instances = list_instances(compute, project, zone)

print("Instances in project %s and zone %s:" % (project, zone))

for instance in instances:

print(" - " + instance["name"])

print(

"""

Instance created.

It will take a minute or two for the instance to complete work.

Check this URL: http://storage.googleapis.com/{}/output.png

Once the image is uploaded press enter to delete the instance.

""".format(

bucket

)

if wait:

input()

print("Deleting instance.")

operation = delete_instance(compute, project, zone, instance_name)

wait_for_operation(compute, project, zone, operation["name"])

if __name__ == "__main__":

parser = argparse.ArgumentParser(

description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter

)

parser.add_argument("project_id", help="Your Google Cloud project ID.")

parser.add_argument("bucket_name", help="Your Google Cloud Storage bucket name.")

parser.add_argument(

"--zone", default="us-central1-f", help="Compute Engine zone to deploy to."

)

parser.add_argument("--name", default="demo-instance", help="New instance name.")

args = parser.parse_args()

main(args.project_id, args.bucket_name, args.zone, args.name)

# [END compute_apiary_run]

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