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"""Utility functions.""" |
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import functools |
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from pathlib import Path |
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from flask import request |
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from openapi_core import create_spec |
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from openapi_core.contrib.flask import FlaskOpenAPIRequest |
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from openapi_core.validation.request.validators import RequestValidator |
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from openapi_spec_validator import validate_spec |
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from openapi_spec_validator.readers import read_from_filename |
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from werkzeug.exceptions import BadRequest, UnsupportedMediaType |
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from kytos.core import log |
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from kytos.core.events import KytosEvent |
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def emit_event(controller, name, **kwargs): |
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"""Send an event when something happens with an EVC.""" |
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event_name = f"kytos/mef_eline.{name}" |
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event = KytosEvent(name=event_name, content=kwargs) |
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controller.buffers.app.put(event) |
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def notify_link_available_tags(controller, link): |
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"""Notify link available tags.""" |
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emit_event(controller, "link_available_tags", link=link) |
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def compare_endpoint_trace(endpoint, vlan, trace): |
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"""Compare and endpoint with a trace step.""" |
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return ( |
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endpoint.switch.dpid == trace["dpid"] |
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and endpoint.port_number == trace["port"] |
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and vlan == trace["vlan"] |
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) |
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def load_spec(): |
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"""Validate openapi spec.""" |
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napp_dir = Path(__file__).parent |
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yml_file = napp_dir / "openapi.yml" |
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spec_dict, _ = read_from_filename(yml_file) |
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validate_spec(spec_dict) |
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return create_spec(spec_dict) |
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def validate(spec): |
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"""Decorator to validate a REST endpoint input. |
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Uses the schema defined in the openapi.yml file |
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to validate. |
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""" |
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def validate_decorator(func): |
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@functools.wraps(func) |
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def wrapper_validate(*args, **kwargs): |
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try: |
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data = request.get_json() |
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except BadRequest: |
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result = "The request body is not a well-formed JSON." |
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log.debug("create_circuit result %s %s", result, 400) |
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raise BadRequest(result) from BadRequest |
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if data is None: |
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result = "The request body mimetype is not application/json." |
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log.debug("update result %s %s", result, 415) |
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raise UnsupportedMediaType(result) |
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validator = RequestValidator(spec) |
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openapi_request = FlaskOpenAPIRequest(request) |
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result = validator.validate(openapi_request) |
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if result.errors: |
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errors = result.errors[0] |
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if hasattr(errors, "schema_errors"): |
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schema_errors = errors.schema_errors[0] |
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error_log = { |
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"error_message": schema_errors.message, |
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"error_validator": schema_errors.validator, |
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"error_validator_value": schema_errors.validator_value, |
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"error_path": list(schema_errors.path), |
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"error_schema": schema_errors.schema, |
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"error_schema_path": list(schema_errors.schema_path), |
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} |
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log.debug("error response: %s", error_log) |
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error_response = f"{schema_errors.message} for field" |
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error_response += ( |
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f" {'/'.join(map(str,schema_errors.path))}." |
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) |
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else: |
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error_response = ( |
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"The request body mimetype is not application/json." |
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) |
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raise BadRequest(error_response) from BadRequest |
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return func(*args, data=data, **kwargs) |
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return wrapper_validate |
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return validate_decorator |
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kytos-ng /
mef_eline
