#!/usr/bin/env python3 ''' Transmission setup example: reads from network json (default = examples/edfa/edfa_example_network.json) propagates a 96 channels comb ''' from gnpy.core.equipment import load_equipment, trx_mode_params from gnpy.core.utils import db2lin, lin2db from argparse import ArgumentParser from sys import exit from pathlib import Path from json import loads from collections import Counter from logging import getLogger, basicConfig, INFO, ERROR, DEBUG from numpy import arange from matplotlib.pyplot import show, axis, figure, title from networkx import (draw_networkx_nodes, draw_networkx_edges, draw_networkx_labels, dijkstra_path) from gnpy.core.network import load_network, build_network, set_roadm_loss, set_edfa_dp from gnpy.core.elements import Transceiver, Fiber, Edfa, Roadm from gnpy.core.info import create_input_spectral_information, SpectralInformation, Channel, Power, Pref from gnpy.core.request import Path_request, RequestParams, compute_constrained_path, propagate logger = getLogger(__name__) def plot_results(network, path, source, destination): path_edges = set(zip(path[:-1], path[1:])) edges = set(network.edges()) - path_edges pos = {n: (n.lng, n.lat) for n in network.nodes()} labels = {n: n.location.city for n in network.nodes() if isinstance(n, Transceiver)} city_labels = set(labels.values()) for n in network.nodes(): if n.location.city and n.location.city not in city_labels: labels[n] = n.location.city city_labels.add(n.location.city) label_pos = pos fig = figure() kwargs = {'figure': fig, 'pos': pos} plot = draw_networkx_nodes(network, nodelist=network.nodes(), node_color='#ababab', **kwargs) draw_networkx_nodes(network, nodelist=path, node_color='#ff0000', **kwargs) draw_networkx_edges(network, edgelist=edges, edge_color='#ababab', **kwargs) draw_networkx_edges(network, edgelist=path_edges, edge_color='#ff0000', **kwargs) draw_networkx_labels(network, labels=labels, font_size=14, **{**kwargs, 'pos': label_pos}) title(f'Propagating from {source.loc.city} to {destination.loc.city}') axis('off') show() def main(network, equipment, source, destination, req = None): power_mode = equipment['Spans']['default'].power_mode print('\n'.join([f'Power mode is set to {power_mode}', f'=> it can be modified in eqpt_config.json - Spans'])) set_roadm_loss(network, equipment, False, 0) build_network(network, equipment=equipment) path = compute_constrained_path(network, req) if power_mode: set_edfa_dp(network, path) spans = [s.length for s in path if isinstance(s, Fiber)] print(f'\nThere are {len(spans)} fiber spans over {sum(spans):.0f}m between {source.uid} and {destination.uid}') print(f'\nNow propagating between {source.uid} and {destination.uid}:') pref_span_db = lin2db(req.power*1e3) try: power_range = arange(*equipment['SI']['default'].power_range_db) except TypeError: print('invalid power range definition in eqpt_config, should be power_range_db: [lower, upper, step]') power_range = [0] for dp_db in power_range: p_db = pref_span_db + dp_db pref_roadm_db = equipment['Roadms']['default'].power_mode_pref roadm_loss = p_db - pref_roadm_db #dynamic update the ROADM loss wrto power sweep to keep the same pref_roadm set_roadm_loss(network, equipment, power_mode, roadm_loss) p = db2lin(p_db)*1e-3 req.power = p print(f'\nPropagating with input power = {lin2db(req.power*1e3):.2f}dBm :') propagate(path, req, equipment, show=len(power_range)==1) print(f'\nTransmission result for input power = {lin2db(req.power*1e3):.2f}dBm :') print(destination) return path parser = ArgumentParser() parser.add_argument('-e', '--equipment', type=Path, default=Path(__file__).parent / 'eqpt_config.json') parser.add_argument('-pl', '--plot', action='store_true', default=False) parser.add_argument('-v', '--verbose', action='count') parser.add_argument('-l', '--list-nodes', action='store_true', default=False, help='list all transceiver nodes') parser.add_argument('-po', '--power', default=0, help='channel ref power in dBm') #parser.add_argument('-plb', '--power-lower-bound', default=0, help='power sweep lower bound') #parser.add_argument('-pub', '--power-upper-bound', default=1, help='power sweep upper bound') parser.add_argument('filename', nargs='?', type=Path, default=Path(__file__).parent / 'edfa_example_network.json') parser.add_argument('source', nargs='?', help='source node') parser.add_argument('destination', nargs='?', help='destination node') if __name__ == '__main__': args = parser.parse_args() basicConfig(level={0: ERROR, 1: INFO, 2: DEBUG}.get(args.verbose, ERROR)) equipment = load_equipment(args.equipment) # logger.info(equipment) print(args.filename) network = load_network(args.filename, equipment) # print(network) transceivers = {n.uid: n for n in network.nodes() if isinstance(n, Transceiver)} if not transceivers: exit('Network has no transceivers!') if len(transceivers) < 2: exit('Network has only one transceiver!') if args.list_nodes: for uid in transceivers: print(uid) exit() if args.source: try: source = next(transceivers[uid] for uid in transceivers if uid == args.source) except StopIteration as e: #TODO code a more advanced regex to find nodes match nodes_suggestion = [uid for uid in transceivers \ if args.source.lower() in uid.lower()] source = transceivers[nodes_suggestion[0]] \ if len(nodes_suggestion)>0 else list(transceivers.values())[0] print(f'invalid souce node specified, did you mean:\ \n{nodes_suggestion}?\ \n{args.source!r}, replaced with {source.uid}') del transceivers[source.uid] else: logger.info('No source node specified: picking random transceiver') source = list(transceivers.values())[0] if args.destination: try: destination = next(transceivers[uid] for uid in transceivers if uid == args.destination) except StopIteration as e: nodes_suggestion = [uid for uid in transceivers \ if args.destination.lower() in uid.lower()] destination = transceivers[nodes_suggestion[0]] \ if len(nodes_suggestion)>0 else list(transceivers.values())[0] print(f'invalid destination node specified, did you mean:\ \n{nodes_suggestion}?\ \n{args.destination!r}, replaced with {destination.uid}') else: logger.info('No source node specified: picking random transceiver') destination = list(transceivers.values())[1] logger.info(f'source = {args.source!r}') logger.info(f'destination = {args.destination!r}') params = {} params['request_id'] = 0 params['trx_type'] = '' params['trx_mode'] = '' params['source'] = source.uid params['destination'] = destination.uid params['nodes_list'] = [destination.uid] params['loose_list'] = ['strict'] params['format'] = '' trx_params = trx_mode_params(equipment) if args.power: trx_params['power'] = db2lin(float(args.power))*1e-3 params.update(trx_params) req = Path_request(**params) path = main(network, equipment, source, destination, req) if args.plot: plot_results(network, path, source, destination)