💊 capsul.org cloud compute service - python flask web application
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import sys
import json
import aiohttp
from flask import Blueprint
from flask import current_app
from flask import request
from flask.json import jsonify
from werkzeug.exceptions import abort
from capsulflask.shared import my_exec_info_message, authorized_as_hub
bp = Blueprint("spoke", __name__, url_prefix="/spoke")
@bp.route("/heartbeat", methods=("POST",))
def heartbeat():
if authorized_as_hub(request.headers):
url = f"{current_app.config['HUB_URL']}/hub/heartbeat/{current_app.config['SPOKE_HOST_ID']}"
authorization_header = f"Bearer {current_app.config['SPOKE_HOST_TOKEN']}"
result = current_app.config['HTTP_CLIENT'].do_http_sync(url, body=None, authorization_header=authorization_header)
if result.status_code == -1:
current_app.logger.info(f"/spoke/heartbeat returned 503: hub at {url} timed out or cannot be reached")
return abort(503, "Service Unavailable: hub timed out or cannot be reached")
if result.status_code == 401:
current_app.logger.info(f"/spoke/heartbeat returned 502: hub at {url} rejected our token")
return abort(502, "hub rejected our token")
if result.status_code != 200:
current_app.logger.info(f"/spoke/heartbeat returned 502: hub at {url} returned {result.status_code}")
return abort(502, "Bad Gateway: hub did not return 200")
return "OK"
else:
current_app.logger.info(f"/spoke/heartbeat returned 401: invalid hub token")
return abort(401, "invalid hub token")
@bp.route("/operation/<int:operation_id>", methods=("POST",))
def operation_with_id(operation_id: int):
return operation_impl(operation_id)
@bp.route("/operation", methods=("POST",))
def operation_without_id():
return operation_impl(None)
def operation_impl(operation_id: int):
if authorized_as_hub(request.headers):
request_body_json = request.json
request_body = json.loads(request_body_json)
#current_app.logger.info(f"request.json: {request_body}")
handlers = {
"capacity_avaliable": handle_capacity_avaliable,
"get": handle_get,
"get_all_by_id": handle_get_all_by_id,
"create": handle_create,
"destroy": handle_destroy,
"vm_state_command": handle_vm_state_command,
"net_set_dhcp": handle_net_set_dhcp,
}
error_message = ""
types_csv = ", ".join(handlers.keys())
if isinstance(request_body, dict) and 'type' in request_body:
if request_body['type'] in handlers:
try:
return handlers[request_body['type']](operation_id, request_body)
except:
error_message = my_exec_info_message(sys.exc_info())
current_app.logger.error(f"unhandled exception in {request_body['type']} handler: {error_message}")
return jsonify(dict(error_message=error_message))
else:
error_message = f"'type' must be one of {types_csv}"
else:
error_message = "'type' json property is required"
if error_message != "":
current_app.logger.error(f"/hosts/operation returned 400: {error_message}")
return abort(400, f"bad request; {error_message}")
else:
current_app.logger.warning(f"/hosts/operation returned 401: invalid hub token")
return abort(401, "invalid hub token")
def handle_capacity_avaliable(operation_id, request_body):
if 'additional_ram_bytes' not in request_body:
current_app.logger.error(f"/hosts/operation returned 400: additional_ram_bytes is required for capacity_avaliable")
return abort(400, f"bad request; additional_ram_bytes is required for capacity_avaliable")
has_capacity = current_app.config['SPOKE_MODEL'].capacity_avaliable(request_body['additional_ram_bytes'])
return jsonify(dict(assignment_status="assigned", capacity_avaliable=has_capacity))
def handle_get(operation_id, request_body):
if 'id' not in request_body:
current_app.logger.error(f"/hosts/operation returned 400: id is required for get")
return abort(400, f"bad request; id is required for get")
vm = current_app.config['SPOKE_MODEL'].get(request_body['id'], request_body['get_ssh_host_keys'])
if vm is None:
return jsonify(dict(assignment_status="assigned"))
return jsonify(dict(assignment_status="assigned", id=vm.id, host=vm.host, state=vm.state, ipv4=vm.ipv4, ipv6=vm.ipv6, ssh_host_keys=vm.ssh_host_keys))
def handle_get_all_by_id(operation_id, request_body) -> dict:
return jsonify(dict(assignment_status="assigned", vms=current_app.config['SPOKE_MODEL'].get_all_by_id()))
def handle_create(operation_id, request_body):
if not operation_id:
current_app.logger.error(f"/hosts/operation returned 400: operation_id is required for create ")
return abort(400, f"bad request; operation_id is required. try POST /spoke/operation/<id>")
parameters = ["email", "id", "os", "size", "template_image_file_name", "vcpus", "memory_mb", "ssh_authorized_keys"]
error_message = ""
for parameter in parameters:
if parameter not in request_body:
error_message = f"{error_message}\n{parameter} is required for create"
if error_message != "":
current_app.logger.error(f"/hosts/operation returned 400: {error_message}")
return abort(400, f"bad request; {error_message}")
# only one host should create the vm, so we first race to assign this create operation to ourselves.
# only one host will win this race.
authorization_header = f"Bearer {current_app.config['SPOKE_HOST_TOKEN']}"
url = f"{current_app.config['HUB_URL']}/hub/claim-operation/{operation_id}/{current_app.config['SPOKE_HOST_ID']}"
result = current_app.config['HTTP_CLIENT'].do_http_sync(url, body=None, authorization_header=authorization_header)
assignment_status = ""
if result.status_code == 200:
try:
assignment_info = json.loads(result.body)
if not isinstance(assignment_info, dict):
return abort(503, f"hub at '{url}' returned 200, but did not return assignment_info json object")
if 'network_name' not in assignment_info:
return abort(503, f"hub at '{url}' returned 200, but the returned assignment_info object did not include network_name")
if 'public_ipv4' not in assignment_info:
return abort(503, f"hub at '{url}' returned 200, but the returned assignment_info object did not include public_ipv4")
assignment_status = "assigned"
request_body['network_name'] = assignment_info['network_name']
request_body['public_ipv4'] = assignment_info['public_ipv4']
except:
return abort(503, f"hub at '{url}' returned 200, but did not return valid json")
elif result.status_code == 409:
assignment_status = "assigned_to_other_host"
else:
current_app.logger.error(f"{url} returned {result.status_code}: {result.body}")
return abort(503, f"hub did not cleanly handle our request to claim the create operation")
if assignment_status == "assigned":
# TODO this should probably be spun off as a coroutine
# and at the end of that coroutine, we should set the VM's state from "creating" to "booting"
# see the corresponding TODO in hub_api.on_create_claimed
try:
current_app.config['SPOKE_MODEL'].create(
email=request_body['email'],
id=request_body['id'],
template_image_file_name=request_body['template_image_file_name'],
vcpus=request_body['vcpus'],
memory_mb=request_body['memory_mb'],
ssh_authorized_keys=list(map(lambda x: x['content'], request_body['ssh_authorized_keys'])),
network_name=request_body['network_name'],
public_ipv4=request_body['public_ipv4'],
)
except:
error_message = my_exec_info_message(sys.exc_info())
params = f"email='{request_body['email'] if 'email' in request_body else 'KeyError'}', "
params= f"{params} id='{request_body['id'] if 'id' in request_body else 'KeyError'}', "
params= f"{params} template_image_file_name='{request_body['template_image_file_name'] if 'template_image_file_name' in request_body else 'KeyError'}', "
params= f"{params} vcpus='{request_body['vcpus'] if 'vcpus' in request_body else 'KeyError'}', "
params= f"{params} memory_mb='{request_body['memory_mb'] if 'memory_mb' in request_body else 'KeyError'}', "
params= f"{params} ssh_authorized_keys='{request_body['ssh_authorized_keys'] if 'ssh_authorized_keys' in request_body else 'KeyError'}', "
params= f"{params} network_name='{request_body['network_name'] if 'network_name' in request_body else 'KeyError'}', "
params= f"{params} public_ipv4='{request_body['public_ipv4'] if 'public_ipv4' in request_body else 'KeyError'}', "
current_app.logger.error(f"spoke_model.create({params}) failed: {error_message}")
return jsonify(dict(assignment_status=assignment_status, error_message=error_message))
return jsonify(dict(assignment_status=assignment_status))
def handle_destroy(operation_id, request_body):
if 'id' not in request_body:
current_app.logger.error(f"/hosts/operation returned 400: id is required for destroy")
return abort(400, f"bad request; id is required for destroy")
if 'email' not in request_body:
current_app.logger.error(f"/hosts/operation returned 400: email is required for destroy")
return abort(400, f"bad request; email is required for destroy")
try:
vm = current_app.config['SPOKE_MODEL'].get(request_body['id'], False)
current_app.logger.warning(f"destroy {request_body['id']} was called for {request_body['email']}, however the vm does not exist. returning success. ")
if vm is not None:
current_app.config['SPOKE_MODEL'].destroy(id=request_body['id'], email=request_body['email'])
except:
error_message = my_exec_info_message(sys.exc_info())
params = f"email='{request_body['email'] if 'email' in request_body else 'KeyError'}', "
params= f"{params} id='{request_body['id'] if 'id' in request_body else 'KeyError'}', "
current_app.logger.error(f"current_app.config['SPOKE_MODEL'].destroy({params}) failed: {error_message}")
return jsonify(dict(assignment_status="assigned", status="error", error_message=error_message))
return jsonify(dict(assignment_status="assigned", status="success"))
def handle_vm_state_command(operation_id, request_body):
required_properties = ['id', 'email', 'command']
for required_property in required_properties:
if required_property not in request_body:
current_app.logger.error(f"/hosts/operation returned 400: {required_property} is required for vm_state_command")
return abort(400, f"bad request; {required_property} is required for vm_state_command")
if request_body['command'] not in ["stop", "force-stop", "start", "restart"]:
current_app.logger.error(f"/hosts/operation returned 400: command ({request_body['command']}) must be one of stop, force-stop, start, or restart")
return abort(400, f"bad request; command ({request_body['command']}) must be one of stop, force-stop, start, or restart")
try:
current_app.config['SPOKE_MODEL'].vm_state_command(id=request_body['id'], email=request_body['email'], command=request_body['command'])
except:
error_message = my_exec_info_message(sys.exc_info())
params = f"email='{request_body['email'] if 'email' in request_body else 'KeyError'}', "
params= f"{params} id='{request_body['id'] if 'id' in request_body else 'KeyError'}', "
params= f"{params} command='{request_body['command'] if 'command' in request_body else 'KeyError'}', "
current_app.logger.error(f"current_app.config['SPOKE_MODEL'].vm_state_command({params}) failed: {error_message}")
return jsonify(dict(assignment_status="assigned", status="error", error_message=error_message))
return jsonify(dict(assignment_status="assigned", status="success"))
def handle_net_set_dhcp(operation_id, request_body):
required_properties = ['email', 'network_name', 'macs']
for required_property in required_properties:
if required_property not in request_body:
current_app.logger.error(f"/hosts/operation returned 400: {required_property} is required for net_set_dhcp")
return abort(400, f"bad request; {required_property} is required for net_set_dhcp")
remove_is_missing = ('remove_ipv4' not in request_body or request_body['remove_ipv4'] is None)
add_is_missing = ('add_ipv4' not in request_body or request_body['add_ipv4'] is None)
if remove_is_missing and add_is_missing:
current_app.logger.error(f"/hosts/operation returned 400: either remove_ipv4 or add_ipv4 is required for net_set_dhcp")
return abort(400, f"bad request; either remove_ipv4 or add_ipv4 is required for net_set_dhcp")
if remove_is_missing:
request_body['remove_ipv4'] = None
if add_is_missing:
request_body['add_ipv4'] = None
try:
current_app.config['SPOKE_MODEL'].net_set_dhcp(email=request_body['email'], host_id=None, network_name=request_body['network_name'], macs=request_body['macs'], remove_ipv4=request_body['remove_ipv4'], add_ipv4=request_body['add_ipv4'])
except:
error_message = my_exec_info_message(sys.exc_info())
params= f"email='{request_body['email'] if 'email' in request_body else 'KeyError'}', "
params= f"{params} network_name='{request_body['network_name'] if 'network_name' in request_body else 'KeyError'}', "
params= f"{params} macs='{request_body['macs'] if 'macs' in request_body else 'KeyError'}', "
params= f"{params} remove_ipv4='{request_body['remove_ipv4'] if 'remove_ipv4' in request_body else 'KeyError'}', "
params= f"{params} add_ipv4='{request_body['add_ipv4'] if 'add_ipv4' in request_body else 'KeyError'}', "
current_app.logger.error(f"current_app.config['SPOKE_MODEL'].net_set_dhcp({params}) failed: {error_message}")
return jsonify(dict(assignment_status="assigned", status="error", error_message=error_message))
return jsonify(dict(assignment_status="assigned", status="success"))