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"""Utility functions.""" |
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from kytos.core.events import KytosEvent |
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5
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def map_evc_event_content(evc, **kwargs): |
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"""Returns a set of values from evc to be used for content""" |
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return kwargs | {"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 map_dl_vlan(value): |
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"""Map dl_vlan value with the following criteria: |
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dl_vlan = untagged or 0 -> None |
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dl_vlan = any or "4096/4096" -> 1 |
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dl_vlan = "num1/num2" -> int in [1, 4095]""" |
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special_untagged = {"untagged", 0} |
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if value in special_untagged: |
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return None |
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special_any = {"any": 1, "4096/4096": 1} |
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value = special_any.get(value, value) |
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if isinstance(value, int): |
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return value |
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value, mask = map(int, value.split('/')) |
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return value & (mask & 4095) |
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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 = map_dl_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 max_power2_divisor(number: int, limit: int = 4096) -> int: |
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"""Get the max power of 2 that is divisor of number""" |
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while number % limit > 0: |
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limit //= 2 |
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return limit |
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def get_vlan_tags_and_masks(start: int, end: int) -> list[tuple[int, int]]: |
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"""Get the minimum number of vlan/mask pairs for a given range.""" |
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limit = end + 1 |
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tags_and_masks = [] |
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while start < limit: |
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divisor = max_power2_divisor(start) |
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while divisor > limit - start: |
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divisor //= 2 |
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tags_and_masks.append((start, 4096-divisor)) |
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start += divisor |
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return tags_and_masks |
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kytos-ng /
mef_eline
