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from collections import Counter, defaultdict
from itertools import count
from packaging.utils import canonicalize_name
from pygraphviz import AGraph
from resolvelib import BaseReporter
class GraphGeneratingReporter(BaseReporter):
def __init__(self):
self.evolution = [] # List[str]
self._evaluating = None
# Dict[Candidate, Set[Requirement]]
self._dependencies = defaultdict(set)
# Dict[Candidate.name, Counter[Requirement]]
self._active_requirements = defaultdict(Counter)
self._node_names = {}
self._counter = count()
self.graph = AGraph(
directed=True,
rankdir="LR",
labelloc="top",
labeljust="center",
nodesep="0",
concentrate="true",
)
self.graph.add_node("root", label=":root:", shape="Mdiamond")
self._node_names[self._key(None)] = "root"
del self.graph.node_attr["label"]
self.graph.edge_attr.update(
{"arrowhead": "empty", "style": "dashed", "color": "#808080"}
)
#
# Internal Graph-handling API
#
def _prepare_node(self, obj):
cls = obj.__class__.__name__
n = next(self._counter)
node_name = f"{cls}_{n}"
self._node_names[self._key(obj)] = node_name
return node_name
def _key(self, obj):
if obj is None:
return None
return (
obj.__class__.__name__,
repr(obj),
)
def _get_subgraph(self, name, *, must_exist_already=True):
name = canonicalize_name(name)
c_name = f"cluster_{name}"
subgraph = self.graph.get_subgraph(c_name)
if subgraph is None:
if must_exist_already:
existing = [s.name for s in self.graph.subgraphs_iter()]
raise RuntimeError(f"Graph for {name} not found. Existing: {existing}")
else:
subgraph = self.graph.add_subgraph(name=c_name, label=name)
return subgraph
def _add_candidate(self, candidate):
if candidate is None:
return
if self._key(candidate) in self._node_names:
return
node_name = self._prepare_node(candidate)
# A candidate is only seen after a requirement with the same name.
subgraph = self._get_subgraph(candidate.name, must_exist_already=True)
subgraph.add_node(node_name, label=candidate.version, shape="box")
def _add_requirement(self, req):
if self._key(req) in self._node_names:
return
name = self._prepare_node(req)
subgraph = self._get_subgraph(req.name, must_exist_already=False)
subgraph.add_node(name, label=str(req.specifier) or "*", shape="cds")
def _ensure_edge(self, from_, *, to, **attrs):
from_node = self._node_names[self._key(from_)]
to_node = self._node_names[self._key(to)]
try:
existing = self.graph.get_edge(from_node, to_node)
except KeyError:
attrs.update(headport="w", tailport="e")
self.graph.add_edge(from_node, to_node, **attrs)
else:
existing.attr.update(attrs)
def _get_node_for(self, obj):
node_name = self._node_names[self._key(obj)]
node = self.graph.get_node(node_name)
assert node is not None
return node_name, node
def _track_evaluating(self, candidate):
if self._evaluating != candidate:
if self._evaluating is not None:
self.backtracking(self._evaluating, internal=True)
self.evolution.append(self.graph.to_string())
self._evaluating = candidate
#
# Public reporter API
#
def starting(self):
print("starting(self)")
def starting_round(self, index):
print(f"starting_round(self, {index})")
# self.graph.graph_attr["label"] = f"Round {index}"
self.evolution.append(self.graph.to_string())
def ending_round(self, index, state):
print(f"ending_round(self, {index}, state)")
def ending(self, state):
print("ending(self, state)")
def adding_requirement(self, req, parent):
print(f"adding_requirement(self, {req!r}, {parent!r})")
self._track_evaluating(parent)
self._add_candidate(parent)
self._add_requirement(req)
self._ensure_edge(parent, to=req)
self._active_requirements[canonicalize_name(req.name)][req] += 1
self._dependencies[parent].add(req)
if parent is None:
return
# We're seeing the parent candidate (which is being "evaluated"), so
# color all "active" requirements pointing to the it.
# TODO: How does this interact with revisited candidates?
for parent_req in self._active_requirements[canonicalize_name(parent.name)]:
self._ensure_edge(parent_req, to=parent, color="#80CC80")
def backtracking(self, candidate, internal=False):
print(f"backtracking(self, {candidate!r}, internal={internal})")
self._track_evaluating(candidate)
self._evaluating = None
# Update the graph!
node_name, node = self._get_node_for(candidate)
node.attr.update(shape="signature", color="red")
for edge in self.graph.out_edges_iter([node_name]):
edge.attr.update(style="dotted", arrowhead="vee", color="#FF9999")
_, to = edge
to.attr.update(color="black")
for edge in self.graph.in_edges_iter([node_name]):
edge.attr.update(style="dotted", color="#808080")
# Trim "active" requirements to remove anything not relevant now.
for requirement in self._dependencies[candidate]:
active = self._active_requirements[canonicalize_name(requirement.name)]
active[requirement] -= 1
if not active[requirement]:
del active[requirement]
def pinning(self, candidate):
print(f"pinning(self, {candidate!r})")
assert self._evaluating == candidate or self._evaluating is None
self._evaluating = None
self._add_candidate(candidate)
# Update the graph!
node_name, node = self._get_node_for(candidate)
node.attr.update(color="#80CC80")
# Requirement -> Candidate edges, from this candidate.
for req in self._active_requirements[canonicalize_name(candidate.name)]:
self._ensure_edge(req, to=candidate, arrowhead="vee", color="#80CC80")
# Candidate -> Requirement edges, from this candidate.
for edge in self.graph.out_edges_iter([node_name]):
edge.attr.update(style="solid", arrowhead="vee", color="#80CC80")
_, to = edge
to.attr.update(color="#80C080")
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