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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 map_evc_event_content(evc): |
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"""Returns a set of values from evc to be used for content""" |
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return {"evc_id": evc.id, |
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"name": evc.name, |
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"metadata": evc.metadata, |
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"active": evc._active, |
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"enabled": evc._enabled, |
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"uni_a": evc.uni_a.as_dict(), |
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"uni_z": evc.uni_z.as_dict()} |
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def emit_event(controller, name, context="kytos/mef_eline", content=None): |
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"""Send an event when something happens with an EVC.""" |
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event_name = f"{context}.{name}" |
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event = KytosEvent(name=event_name, content=content) |
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controller.buffers.app.put(event) |
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def notify_link_available_tags(controller, link, src_func=None): |
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"""Notify link available tags.""" |
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emit_event(controller, "link_available_tags", content={ |
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"link": link, |
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"src_func": src_func |
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}) |
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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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if vlan and "vlan" in trace: |
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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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return ( |
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endpoint.switch.dpid == trace["dpid"] |
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and endpoint.port_number == trace["port"] |
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) |
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def compare_uni_out_trace(uni, trace): |
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"""Check if the trace last step (output) matches the UNI attributes.""" |
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# keep compatibility for old versions of sdntrace-cp |
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if "out" not in trace: |
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return True |
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if not isinstance(trace["out"], dict): |
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return False |
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uni_vlan = uni.user_tag.value if uni.user_tag else None |
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return ( |
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uni.interface.port_number == trace["out"].get("port") |
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and uni_vlan == trace["out"].get("vlan") |
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) |
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def uni_to_str(uni): |
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"""Create a string representation of the uni: intf_id:portno[:vlan].""" |
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dpid = uni.interface.switch.dpid |
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port = uni.interface.port_number |
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uni_str = str(dpid) + ':' + str(port) |
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if uni.user_tag: |
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uni_str += ':' + str(uni.user_tag.value) |
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return uni_str |
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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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error_response = ( |
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"The request body contains invalid API data." |
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) |
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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("Invalid request (API schema): %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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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
