build.graph.KytosGraph.get_metadata_from_link() - Code Metrics - Inspection of "Logic Changes" - kytos/pathfinder - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#58)

unknown

created 2020-06-16 19:18 UTC

build.graph.KytosGraph.get_metadata_from_link() A

↳ Parent: build.graph

Complexity

Conditions

Size

Total Lines	3
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	2

Importance

Changes

Metric	Value
cc	1
eloc	2
nop	3
dl	0
loc	3
rs	10
c	0
b	0
f	0
ccs	0
cts	0
cp	0
crap	2

"""Module Graph of kytos/pathfinder Kytos Network Application."""

from kytos.core import log

try:
    import networkx as nx
    from networkx.exception import NodeNotFound, NetworkXNoPath
except ImportError:
    PACKAGE = 'networkx>=2.2'
    log.error(f"Package {PACKAGE} not found. Please 'pip install {PACKAGE}'")

from itertools import combinations

class Filter:
    '''Class responsible for removing items with disqualifying values'''
    def __init__(self, filter_type, filter_function):
        self._filter_type = filter_type
        self._filter_fun = filter_function

    def run(self,value, items):
        if isinstance(value, self._filter_type):
            return filter(self._filter_fun(value), items)
        else:
            raise TypeError(f"Expected type: {self._filter_type}")

class KytosGraph:
    """Class responsible for the graph generation."""
    def __init__(self):
        self.graph = nx.Graph()
        self._filter_fun_dict = {}
        def filterLEQ(metric):# Lower values are better
            return lambda x: (lambda y: y[2].get(metric,x) <= x)

        def filterGEQ(metric):# Higher values  are better
            return lambda x: (lambda y: y[2].get(metric,x) >= x)

        def filterEEQ(metric):# Equivalence
            return lambda x: (lambda y: y[2].get(metric,x) == x)


        self._filter_fun_dict["ownership"] = Filter(str,filterEEQ("ownership"))
        self._filter_fun_dict["bandwidth"] = Filter((int,float),filterGEQ("bandwidth"))
        self._filter_fun_dict["priority"] = Filter((int,float),filterGEQ("priority"))
        self._filter_fun_dict["reliability"] = Filter((int,float),filterGEQ("reliability"))
        self._filter_fun_dict["utilization"] = Filter((int,float),filterLEQ("utilization"))
        self._filter_fun_dict["delay"] = Filter((int,float),filterLEQ("delay"))
        self._path_fun = nx.all_shortest_paths

    def set_path_fun(self, path_fun):
        self._path_fun = path_fun

    def clear(self):
        """Remove all nodes and links registered."""
        self.graph.clear()

    def update_topology(self, topology):
        """Update all nodes and links inside the graph."""
        self.graph.clear()
        self.update_nodes(topology.switches)
        self.update_links(topology.links)

    def update_nodes(self, nodes):
        """Update all nodes inside the graph."""
        for node in nodes.values():
            try:
                self.graph.add_node(node.id)

                for interface in node.interfaces.values():
                    self.graph.add_node(interface.id)
                    self.graph.add_edge(node.id, interface.id)

            except AttributeError:
                pass

    def update_links(self, links):
        """Update all links inside the graph."""
        keys = []
        for link in links.values():
            if link.is_active():
                self.graph.add_edge(link.endpoint_a.id, link.endpoint_b.id)
                for key, value in link.metadata.items():
                    keys.append(key)
                    endpoint_a = link.endpoint_a.id
                    endpoint_b = link.endpoint_b.id
                    self.graph[endpoint_a][endpoint_b][key] = value

    def get_metadata_from_link(self, endpoint_a, endpoint_b):
        """Return the metadata of a link."""
        return self.graph.edges[endpoint_a, endpoint_b]

    @staticmethod
    def _remove_switch_hops(circuit):
        """Remove switch hops from a circuit hops list."""
        for hop in circuit['hops']:
            if len(hop.split(':')) == 8:
                circuit['hops'].remove(hop)

    def shortest_paths(self, source, destination, parameter=None):
        """Calculate the shortest paths and return them."""
        try:
            paths = list(self._path_fun(self.graph,
                                        source, destination, parameter))
        except (NodeNotFound, NetworkXNoPath):
            return []
        return paths

    def constrained_flexible_paths(self, source, destination, metrics, flexible_metrics, \
                                   flexible = None):   
        '''Calculate the constrained shortest paths with flexibility and return them.'''
        default_edge_list = list(self._filter_edges(self.graph.edges(data=True),**metrics))
        length = len(flexible_metrics)
        if flexible is None:
            flexible = length
        flexible = min(length,max(0,flexible))
        results = []
        stop = False
        i = 0

        while (not stop and i in range(0, flexible+1)):
            combos = combinations(flexible_metrics.items(),length-i)
            for combo in combos:
                tempDict = {}
                for metric,value in combo:
                    tempDict[metric] = value
                edges = self._filter_edges(default_edge_list,**tempDict)
                edges = ((u,v) for u,v,d in edges)

                result = self._constrained_shortest_paths(source,destination,edges)
                if result != []:
                    results.append({"paths":result, "metrics":{**metrics,**tempDict}})
                    stop = True
            i = i + 1
        return results

    def _constrained_shortest_paths(self, source, destination, edges):
        paths = []
        try:
            paths = list(self._path_fun(self.graph.edge_subgraph(edges),
                                        source, destination))
        except NetworkXNoPath:
            pass
        except NodeNotFound:
            if source == destination:
                if source in self.graph.nodes:
                    paths = [[source]]
        return paths

    def _filter_edges(self, edges, **metrics):
        for metric, value in metrics.items():
            fil = self._filter_fun_dict.get(metric, None)
            if fil != None:
                try:
                    edges = fil.run(value,edges)
                except TypeError as err:
                    raise TypeError(f"Error in {metric} filter: {err}")
        return edges


1		"""Module Graph of kytos/pathfinder Kytos Network Application."""
2
3	1	from kytos.core import log
4
5	1	try:
6	1	import networkx as nx
7	1	from networkx.exception import NodeNotFound, NetworkXNoPath
8		except ImportError:
9		PACKAGE = 'networkx>=2.2'
10		log.error(f"Package {PACKAGE} not found. Please 'pip install {PACKAGE}'")
11
12		from itertools import combinations
13	1
14		class Filter:
15		'''Class responsible for removing items with disqualifying values'''
16	1	def __init__(self, filter_type, filter_function):
17	1	self._filter_type = filter_type
18		self._filter_fun = filter_function
19	1
20		def run(self,value, items):
21	1	if isinstance(value, self._filter_type):
22		return filter(self._filter_fun(value), items)
23	1	else:
24		raise TypeError(f"Expected type: {self._filter_type}")
25	1
26	1	class KytosGraph:
27	1	"""Class responsible for the graph generation."""
28		def __init__(self):
29	1	self.graph = nx.Graph()
30		self._filter_fun_dict = {}
31	1	def filterLEQ(metric):# Lower values are better
32	1	return lambda x: (lambda y: y[2].get(metric,x) <= x)
		0 ignored issues – show Comprehensibility Best Practice introduced 2020-05-28 14:34 UTC by Report Bug Copy Issue Report The variable `x` does not seem to be defined. Loading history...
33	1	def filterGEQ(metric):# Higher values are better
34		return lambda x: (lambda y: y[2].get(metric,x) >= x)
		0 ignored issues – show Comprehensibility Best Practice introduced 2020-05-28 14:34 UTC by Report Bug Copy Issue Report The variable `x` does not seem to be defined. Loading history...
35	1	def filterEEQ(metric):# Equivalence
36	1	return lambda x: (lambda y: y[2].get(metric,x) == x)
		0 ignored issues – show Comprehensibility Best Practice introduced 2020-05-28 14:34 UTC by Report Bug Copy Issue Report The variable `x` does not seem to be defined. Loading history...
37	1
38		self._filter_fun_dict["ownership"] = Filter(str,filterEEQ("ownership"))
39		self._filter_fun_dict["bandwidth"] = Filter((int,float),filterGEQ("bandwidth"))
40		self._filter_fun_dict["priority"] = Filter((int,float),filterGEQ("priority"))
41		self._filter_fun_dict["reliability"] = Filter((int,float),filterGEQ("reliability"))
42	1	self._filter_fun_dict["utilization"] = Filter((int,float),filterLEQ("utilization"))
43		self._filter_fun_dict["delay"] = Filter((int,float),filterLEQ("delay"))
44	1	self._path_fun = nx.all_shortest_paths
45	1
46	1	def set_path_fun(self, path_fun):
47	1	self._path_fun = path_fun
48	1
49	1	def clear(self):
50	1	"""Remove all nodes and links registered."""
51	1	self.graph.clear()
52	1
53		def update_topology(self, topology):
54	1	"""Update all nodes and links inside the graph."""
55		self.graph.clear()
56	1	self.update_nodes(topology.switches)
57		self.update_links(topology.links)
58
59		def update_nodes(self, nodes):
60		"""Update all nodes inside the graph."""
61		for node in nodes.values():
62	1	try:
63	1	self.graph.add_node(node.id)
64	1
65	1	for interface in node.interfaces.values():
66		self.graph.add_node(interface.id)
67	1	self.graph.add_edge(node.id, interface.id)
68
69		except AttributeError:
70	1	pass
71	1
72	1	def update_links(self, links):
73		"""Update all links inside the graph."""
74	1	keys = []
75		for link in links.values():
76	1	if link.is_active():
77	1	self.graph.add_edge(link.endpoint_a.id, link.endpoint_b.id)
78		for key, value in link.metadata.items():
79		keys.append(key)
80		endpoint_a = link.endpoint_a.id
81		endpoint_b = link.endpoint_b.id
82	1	self.graph[endpoint_a][endpoint_b][key] = value
83
84		def get_metadata_from_link(self, endpoint_a, endpoint_b):
85		"""Return the metadata of a link."""
86		return self.graph.edges[endpoint_a, endpoint_b]
87
88		@staticmethod
89		def _remove_switch_hops(circuit):
90		"""Remove switch hops from a circuit hops list."""
91		for hop in circuit['hops']:
92		if len(hop.split(':')) == 8:
93		circuit['hops'].remove(hop)
94
95		def shortest_paths(self, source, destination, parameter=None):
96		"""Calculate the shortest paths and return them."""
97		try:
98		paths = list(self._path_fun(self.graph,
99		source, destination, parameter))
100		except (NodeNotFound, NetworkXNoPath):
101		return []
102		return paths
103
104		def constrained_flexible_paths(self, source, destination, metrics, flexible_metrics, \
105		flexible = None):
106		'''Calculate the constrained shortest paths with flexibility and return them.'''
107		default_edge_list = list(self._filter_edges(self.graph.edges(data=True),**metrics))
108		length = len(flexible_metrics)
109		if flexible is None:
110		flexible = length
111		flexible = min(length,max(0,flexible))
112		results = []
113		stop = False
114		i = 0
115
116		while (not stop and i in range(0, flexible+1)):
117		combos = combinations(flexible_metrics.items(),length-i)
118		for combo in combos:
119		tempDict = {}
120		for metric,value in combo:
121		tempDict[metric] = value
122		edges = self._filter_edges(default_edge_list,**tempDict)
123		edges = ((u,v) for u,v,d in edges)
		0 ignored issues – show introduced 2020-06-16 17:15 UTC by Report Bug Copy Issue Report The variable `v` does not seem to be defined for all execution paths. Loading history... introduced 2020-05-28 14:34 UTC by Report Bug Copy Issue Report The variable `u` does not seem to be defined for all execution paths. Loading history...
124		result = self._constrained_shortest_paths(source,destination,edges)
125		if result != []:
126		results.append({"paths":result, "metrics":{metrics,tempDict}})
127		stop = True
128		i = i + 1
129		return results
130
131		def _constrained_shortest_paths(self, source, destination, edges):
132		paths = []
133		try:
134		paths = list(self._path_fun(self.graph.edge_subgraph(edges),
135		source, destination))
136		except NetworkXNoPath:
137		pass
138		except NodeNotFound:
139		if source == destination:
140		if source in self.graph.nodes:
141		paths = [[source]]
142		return paths
143
144		def _filter_edges(self, edges, **metrics):
145		for metric, value in metrics.items():
146		fil = self._filter_fun_dict.get(metric, None)
147		if fil != None:
148		try:
149		edges = fil.run(value,edges)
150		except TypeError as err:
151		raise TypeError(f"Error in {metric} filter: {err}")
152		return edges
153

kytos / pathfinder

Pull Request — master (#58)

build.graph.KytosGraph.get_metadata_from_link() A

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