170 lines
7.9 KiB
Python
170 lines
7.9 KiB
Python
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import sys
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import json
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import aiohttp
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from flask import Blueprint
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from flask import current_app
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from flask import request
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from flask.json import jsonify
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from werkzeug.exceptions import abort
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from capsulflask.shared import my_exec_info_message, authorized_as_hub
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bp = Blueprint("spoke", __name__, url_prefix="/spoke")
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@bp.route("/heartbeat", methods=("POST",))
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def heartbeat():
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if authorized_as_hub(request.headers):
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url = f"{current_app.config['HUB_URL']}/hub/heartbeat/{current_app.config['SPOKE_HOST_ID']}"
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authorization_header = f"Bearer {current_app.config['SPOKE_HOST_TOKEN']}"
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result = current_app.config['HTTP_CLIENT'].do_http_sync(url, body=None, authorization_header=authorization_header)
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if result.status_code == -1:
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current_app.logger.info(f"/spoke/heartbeat returned 503: hub at {url} timed out or cannot be reached")
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return abort(503, "Service Unavailable: hub timed out or cannot be reached")
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if result.status_code == 401:
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current_app.logger.info(f"/spoke/heartbeat returned 502: hub at {url} rejected our token")
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return abort(502, "hub rejected our token")
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if result.status_code != 200:
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current_app.logger.info(f"/spoke/heartbeat returned 502: hub at {url} returned {result.status_code}")
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return abort(502, "Bad Gateway: hub did not return 200")
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return "OK"
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else:
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current_app.logger.info(f"/spoke/heartbeat returned 401: invalid hub token")
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return abort(401, "invalid hub token")
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@bp.route("/operation/<int:operation_id>", methods=("POST",))
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def operation_with_id(operation_id: int):
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return operation_impl(operation_id)
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@bp.route("/operation", methods=("POST",))
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def operation_without_id():
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return operation_impl(None)
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def operation_impl(operation_id: int):
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if authorized_as_hub(request.headers):
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request_body_json = request.json
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request_body = json.loads(request_body_json)
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#current_app.logger.info(f"request.json: {request_body}")
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handlers = {
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"capacity_avaliable": handle_capacity_avaliable,
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"get": handle_get,
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"list_ids": handle_list_ids,
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"create": handle_create,
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"destroy": handle_destroy,
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}
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error_message = ""
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types_csv = ", ".join(handlers.keys())
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if isinstance(request_body, dict) and 'type' in request_body:
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if request_body['type'] in handlers:
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try:
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return handlers[request_body['type']](operation_id, request_body)
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except:
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error_message = my_exec_info_message(sys.exc_info())
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current_app.logger.error(f"unhandled exception in {request_body['type']} handler: {error_message}")
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return jsonify(dict(error_message=error_message))
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else:
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error_message = f"'type' must be one of {types_csv}"
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else:
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error_message = "'type' json property is required"
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if error_message != "":
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current_app.logger.error(f"/hosts/operation returned 400: {error_message}")
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return abort(400, f"bad request; {error_message}")
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else:
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current_app.logger.warning(f"/hosts/operation returned 401: invalid hub token")
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return abort(401, "invalid hub token")
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def handle_capacity_avaliable(operation_id, request_body):
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if 'additional_ram_bytes' not in request_body:
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current_app.logger.error(f"/hosts/operation returned 400: additional_ram_bytes is required for capacity_avaliable")
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return abort(400, f"bad request; additional_ram_bytes is required for capacity_avaliable")
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has_capacity = current_app.config['SPOKE_MODEL'].capacity_avaliable(request_body['additional_ram_bytes'])
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return jsonify(dict(assignment_status="assigned", capacity_avaliable=has_capacity))
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def handle_get(operation_id, request_body):
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if 'id' not in request_body:
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current_app.logger.error(f"/hosts/operation returned 400: id is required for get")
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return abort(400, f"bad request; id is required for get")
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vm = current_app.config['SPOKE_MODEL'].get(request_body['id'], request_body['get_ssh_host_keys'])
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# TODO vm can be None when the capsul exists on this host but has no IP address yet
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# when this happens it logs an "error reading assignment_status"
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# To fix this we need to
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# 1. modify shell script to return does it exist on this host + if it does whats its ip
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# 2. if exists but no ip, return assigned with no ip
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return jsonify(dict(assignment_status="assigned", id=vm.id, host=vm.host, ipv4=vm.ipv4, ipv6=vm.ipv6, ssh_host_keys=vm.ssh_host_keys))
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def handle_list_ids(operation_id, request_body):
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return jsonify(dict(assignment_status="assigned", ids=current_app.config['SPOKE_MODEL'].list_ids()))
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def handle_create(operation_id, request_body):
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if not operation_id:
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current_app.logger.error(f"/hosts/operation returned 400: operation_id is required for create ")
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return abort(400, f"bad request; operation_id is required. try POST /spoke/operation/<id>")
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parameters = ["email", "id", "template_image_file_name", "vcpus", "memory_mb", "ssh_authorized_keys"]
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error_message = ""
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for parameter in parameters:
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if parameter not in request_body:
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error_message = f"{error_message}\n{parameter} is required for create"
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if error_message != "":
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current_app.logger.error(f"/hosts/operation returned 400: {error_message}")
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return abort(400, f"bad request; {error_message}")
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# only one host should create the vm, so we first race to assign this create operation to ourselves.
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# only one host will win this race
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authorization_header = f"Bearer {current_app.config['SPOKE_HOST_TOKEN']}"
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url = f"{current_app.config['HUB_URL']}/hub/claim-operation/{operation_id}/{current_app.config['SPOKE_HOST_ID']}"
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result = current_app.config['HTTP_CLIENT'].do_http_sync(url, body=None, authorization_header=authorization_header)
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assignment_status = ""
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if result.status_code == 200:
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assignment_status = "assigned"
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elif result.status_code == 409:
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assignment_status = "assigned_to_other_host"
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else:
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current_app.logger.error(f"{url} returned {result.status_code}: {result.body}")
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return abort(503, f"hub did not cleanly handle our request to claim the create operation")
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if assignment_status == "assigned":
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try:
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current_app.config['SPOKE_MODEL'].create(
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email=request_body['email'],
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id=request_body['id'],
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template_image_file_name=request_body['template_image_file_name'],
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vcpus=request_body['vcpus'],
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memory_mb=request_body['memory_mb'],
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ssh_authorized_keys=request_body['ssh_authorized_keys'],
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)
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except:
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error_message = my_exec_info_message(sys.exc_info())
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params = f"email='{request_body['email']}', id='{request_body['id']}', "
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params = f"{params}, template_image_file_name='{request_body['template_image_file_name']}', vcpus='{request_body['vcpus']}'"
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params = f"{params}, memory_mb='{request_body['memory_mb']}', ssh_authorized_keys='{request_body['ssh_authorized_keys']}'"
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current_app.logger.error(f"spoke_model.create({params}) failed: {error_message}")
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return jsonify(dict(assignment_status=assignment_status, error_message=error_message))
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return jsonify(dict(assignment_status=assignment_status))
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def handle_destroy(operation_id, request_body):
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if 'id' not in request_body:
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current_app.logger.error(f"/hosts/operation returned 400: id is required for destroy")
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return abort(400, f"bad request; id is required for destroy")
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if 'email' not in request_body:
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current_app.logger.error(f"/hosts/operation returned 400: email is required for destroy")
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return abort(400, f"bad request; email is required for destroy")
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try:
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current_app.config['SPOKE_MODEL'].destroy(id=request_body['id'], email=request_body['email'])
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except:
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error_message = my_exec_info_message(sys.exc_info())
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current_app.logger.error(f"current_app.config['SPOKE_MODEL'].destroy(id='{request_body['id']}', email='{request_body['email']}') failed: {error_message}")
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return jsonify(dict(assignment_status="assigned", status="error", error_message=error_message))
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return jsonify(dict(assignment_status="assigned", status="success")) |