Now xdist properly reports the collection errors instead of silently failing to execute the test suite.
751 lines
28 KiB
Python
751 lines
28 KiB
Python
import difflib
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from _pytest.runner import CollectReport
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import pytest
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import py
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from xdist.slavemanage import NodeManager
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queue = py.builtin._tryimport('queue', 'Queue')
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class EachScheduling:
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"""Implement scheduling of test items on all nodes
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If a node gets added after the test run is started then it is
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assumed to replace a node which got removed before it finished
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it's collection. In this case it will only be used if a a node
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with the same spec got removed earlier.
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Any nodes added after the run is started will only get items
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assigned if a node with matching spec was removed before it
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finished all it's pending items. The new node will then be
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assigned the remaining items from the removed node.
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"""
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def __init__(self, numnodes, log=None):
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self.numnodes = numnodes
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self.node2collection = {}
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self.node2pending = {}
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self._started = []
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self._removed2pending = {}
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if log is None:
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self.log = py.log.Producer("eachsched")
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else:
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self.log = log.eachsched
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self.collection_is_completed = False
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@property
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def nodes(self):
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"""A list of all nodes in the scheduler."""
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return list(self.node2pending.keys())
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def hasnodes(self):
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return bool(self.node2pending)
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def haspending(self):
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"""Return True if there are pending test items
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This indicates that collection has finished and nodes are
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still processing test items, so can be thought of as "the
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scheduler is active".
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"""
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for pending in self.node2pending.values():
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if pending:
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return True
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return False
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def addnode(self, node):
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assert node not in self.node2pending
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self.node2pending[node] = []
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def tests_finished(self):
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if not self.collection_is_completed:
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return False
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if self._removed2pending:
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return False
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for pending in self.node2pending.values():
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if len(pending) >= 2:
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return False
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return True
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def addnode_collection(self, node, collection):
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"""Add the collected test items from a node
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Collection is complete once all nodes have submitted their
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collection. In this case it's peding list is set to an empty
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list. When the collection is already completed this
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submission is from a node which was restarted to replace a
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dead node. In this case we already assing the pending items
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here. In either case ``.init_distribute()`` will instruct the
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node to start running the required tests.
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"""
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assert node in self.node2pending
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if not self.collection_is_completed:
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self.node2collection[node] = list(collection)
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self.node2pending[node] = []
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if len(self.node2collection) >= self.numnodes:
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self.collection_is_completed = True
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elif self._removed2pending:
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for deadnode in self._removed2pending:
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if deadnode.gateway.spec == node.gateway.spec:
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dead_collection = self.node2collection[deadnode]
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if collection != dead_collection:
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msg = report_collection_diff(dead_collection,
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collection,
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deadnode.gateway.id,
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node.gateway.id)
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self.log(msg)
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return
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pending = self._removed2pending.pop(deadnode)
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self.node2pending[node] = pending
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break
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def remove_item(self, node, item_index, duration=0):
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self.node2pending[node].remove(item_index)
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def remove_node(self, node):
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# KeyError if we didn't get an addnode() yet
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pending = self.node2pending.pop(node)
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if not pending:
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return
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crashitem = self.node2collection[node][pending.pop(0)]
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if pending:
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self._removed2pending[node] = pending
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return crashitem
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def init_distribute(self):
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"""Schedule the test items on the nodes
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If the node's pending list is empty it is a new node which
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needs to run all the tests. If the pending list is already
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populated (by ``.addnode_collection()``) then it replaces a
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died node and we only need to run those tests.
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"""
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assert self.collection_is_completed
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for node, pending in self.node2pending.items():
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if node in self._started:
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continue
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if not pending:
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pending[:] = range(len(self.node2collection[node]))
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node.send_runtest_all()
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else:
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node.send_runtest_some(pending)
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self._started.append(node)
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class LoadScheduling:
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"""Implement load scheduling accross nodes.
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This distributes the tests collected across all nodes so each test
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is run just once. All nodes collect and submit the test suit and
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when all collections are received it is verified they are
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identical collections. Then the collection gets devided up in
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chunks and chunks get submitted to nodes. Whenver a node finishes
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an item they call ``.remove_item()`` which will trigger the
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scheduler to assign more tests if the number of pending tests for
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the node falls below a low-watermark.
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When created ``numnodes`` defines how many nodes are expected to
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submit a collection, this is used to know when all nodes have
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finished collection or how large the chunks need to be created.
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Attributes:
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:numnodes: The expected number of nodes taking part. The actual
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number of nodes will vary during the scheduler's lifetime as
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nodes are added by the DSession as they are brought up and
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removed either because of a died node or normal shutdown. This
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number is primarily used to know when the initial collection is
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completed.
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:node2collection: Map of nodes and their test collection. All
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collections should always be identical.
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:node2pending: Map of nodes and the indices of their pending
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tests. The indices are an index into ``.pending`` (which is
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identical to their own collection stored in
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``.node2collection``).
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:collection: The one collection once it is validated to be
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identical between all the nodes. It is initialised to None
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until ``.init_distribute()`` is called.
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:pending: List of indices of globally pending tests. These are
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tests which have not yet been allocated to a chunk for a node
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to process.
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:log: A py.log.Producer instance.
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:config: Config object, used for handling hooks.
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"""
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def __init__(self, numnodes, log=None, config=None):
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self.numnodes = numnodes
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self.node2collection = {}
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self.node2pending = {}
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self.pending = []
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self.collection = None
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if log is None:
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self.log = py.log.Producer("loadsched")
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else:
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self.log = log.loadsched
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self.config = config
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@property
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def nodes(self):
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"""A list of all nodes in the scheduler."""
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return list(self.node2pending.keys())
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@property
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def collection_is_completed(self):
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"""Boolean indication initial test collection is complete.
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This is a boolean indicating all initial participating nodes
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have finished collection. The required number of initial
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nodes is defined by ``.numnodes``.
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"""
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return len(self.node2collection) >= self.numnodes
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def haspending(self):
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"""Return True if there are pending test items
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This indicates that collection has finished and nodes are
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still processing test items, so can be thought of as "the
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scheduler is active".
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"""
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if self.pending:
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return True
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for pending in self.node2pending.values():
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if pending:
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return True
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return False
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def hasnodes(self):
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"""Return True if nodes exist in the scheduler."""
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return bool(self.node2pending)
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def addnode(self, node):
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"""Add a new node in the scheduler.
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From now on the node will be allocated chunks of tests to
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execute.
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Called by the ``DSession.slave_slaveready`` hook when it
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sucessfully bootstrapped a new node.
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"""
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assert node not in self.node2pending
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self.node2pending[node] = []
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def tests_finished(self):
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"""Return True if all tests have been executed by the nodes."""
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if not self.collection_is_completed:
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return False
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if self.pending:
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return False
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for pending in self.node2pending.values():
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if len(pending) >= 2:
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return False
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return True
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def addnode_collection(self, node, collection):
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"""Add the collected test items from a node
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The collection is stored in the ``.node2collection`` map.
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Called by the ``DSession.slave_collectionfinish`` hook.
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"""
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assert node in self.node2pending
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if self.collection_is_completed:
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# A new node has been added later, perhaps an original one died.
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assert self.collection # .init_distribute() should have
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# been called by now
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if collection != self.collection:
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other_node = next(iter(self.node2collection.keys()))
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msg = report_collection_diff(self.collection,
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collection,
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other_node.gateway.id,
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node.gateway.id)
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self.log(msg)
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return
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self.node2collection[node] = list(collection)
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def remove_item(self, node, item_index, duration=0):
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"""Mark test item as completed by node
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The duration it took to execute the item is used as a hint to
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the scheduler.
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This is called by the ``DSession.slave_testreport`` hook.
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"""
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self.node2pending[node].remove(item_index)
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self.check_schedule(node, duration=duration)
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def check_schedule(self, node, duration=0):
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"""Maybe schedule new items on the node
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If there are any globally pending nodes left then this will
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check if the given node should be given any more tests. The
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``duration`` of the last test is optionally used as a
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heuristic to influence how many tests the node is assigned.
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"""
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if self.pending:
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# how many nodes do we have?
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num_nodes = len(self.node2pending)
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# if our node goes below a heuristic minimum, fill it out to
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# heuristic maximum
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items_per_node_min = max(2, len(self.pending) // num_nodes // 4)
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items_per_node_max = max(2, len(self.pending) // num_nodes // 2)
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node_pending = self.node2pending[node]
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if len(node_pending) < items_per_node_min:
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if duration >= 0.1 and len(node_pending) >= 2:
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# seems the node is doing long-running tests
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# and has enough items to continue
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# so let's rather wait with sending new items
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return
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num_send = items_per_node_max - len(node_pending)
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self._send_tests(node, num_send)
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self.log("num items waiting for node:", len(self.pending))
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def remove_node(self, node):
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"""Remove an node from the scheduler
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This should be called either when the node crashed or at
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shutdown time. In the former case any pending items assigned
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to the node will be re-scheduled. Called by the
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``DSession.slave_slavefinished`` and
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``DSession.slave_errordown`` hooks.
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Return the item which was being executing while the node
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crashed or None if the node has no more pending items.
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"""
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pending = self.node2pending.pop(node)
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if not pending:
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return
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# The node crashed, reassing pending items
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crashitem = self.collection[pending.pop(0)]
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self.pending.extend(pending)
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for node in self.node2pending:
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self.check_schedule(node)
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return crashitem
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def init_distribute(self):
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"""Initiate distribution of the test collection
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Initiate scheduling of the items across the nodes. If this
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gets called again later it behaves the same as calling
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``.check_schedule()`` on all nodes so that newly added nodes
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will start to be used.
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This is called by the ``DSession.slave_collectionfinish`` hook
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if ``.collection_is_completed`` is True.
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XXX Perhaps this method should have been called ".schedule()".
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"""
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assert self.collection_is_completed
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# Initial distribution already happend, reschedule on all nodes
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if self.collection is not None:
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for node in self.nodes:
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self.check_schedule(node)
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return
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# XXX allow nodes to have different collections
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if not self._check_nodes_have_same_collection():
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self.log('**Different tests collected, aborting run**')
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return
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# Collections are identical, create the index of pending items.
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self.collection = list(self.node2collection.values())[0]
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self.pending[:] = range(len(self.collection))
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if not self.collection:
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return
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# how many items per node do we have about?
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items_per_node = len(self.collection) // len(self.node2pending)
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# take a fraction of tests for initial distribution
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node_chunksize = max(items_per_node // 4, 2)
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# and initialize each node with a chunk of tests
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for node in self.nodes:
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self._send_tests(node, node_chunksize)
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def _send_tests(self, node, num):
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tests_per_node = self.pending[:num]
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if tests_per_node:
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del self.pending[:num]
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self.node2pending[node].extend(tests_per_node)
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node.send_runtest_some(tests_per_node)
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def _check_nodes_have_same_collection(self):
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"""Return True if all nodes have collected the same items.
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If collections differ, this method returns False while logging
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the collection differences and posting collection errors to
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pytest_collectreport hook.
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"""
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node_collection_items = list(self.node2collection.items())
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first_node, col = node_collection_items[0]
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same_collection = True
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for node, collection in node_collection_items[1:]:
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msg = report_collection_diff(
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col,
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collection,
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first_node.gateway.id,
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node.gateway.id,
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)
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if msg:
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same_collection = False
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self.log(msg)
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if self.config is not None:
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rep = CollectReport(node.gateway.id, 'failed', longrepr=msg,
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result=[])
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self.config.hook.pytest_collectreport(report=rep)
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return same_collection
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def report_collection_diff(from_collection, to_collection, from_id, to_id):
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"""Report the collected test difference between two nodes.
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:returns: detailed message describing the difference between the given
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collections, or None if they are equal.
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"""
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if from_collection == to_collection:
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return None
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diff = difflib.unified_diff(
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from_collection,
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to_collection,
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fromfile=from_id,
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tofile=to_id,
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)
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error_message = py.builtin._totext(
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'Different tests were collected between {from_id} and {to_id}. '
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'The difference is:\n'
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'{diff}'
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).format(from_id=from_id, to_id=to_id, diff='\n'.join(diff))
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msg = "\n".join([x.rstrip() for x in error_message.split("\n")])
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return msg
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class Interrupted(KeyboardInterrupt):
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""" signals an immediate interruption. """
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class DSession:
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"""A py.test plugin which runs a distributed test session
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At the beginning of the test session this creates a NodeManager
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instance which creates and starts all nodes. Nodes then emit
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events processed in the pytest_runtestloop hook using the slave_*
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methods.
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Once a node is started it will automatically start running the
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py.test mainloop with some custom hooks. This means a node
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automatically starts collecting tests. Once tests are collected
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it will wait for instructions.
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"""
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def __init__(self, config):
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self.config = config
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self.log = py.log.Producer("dsession")
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if not config.option.debug:
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py.log.setconsumer(self.log._keywords, None)
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self.shuttingdown = False
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self.countfailures = 0
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self.maxfail = config.getvalue("maxfail")
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self.queue = queue.Queue()
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self._failed_collection_errors = {}
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self._active_nodes = set()
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try:
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self.terminal = config.pluginmanager.getplugin("terminalreporter")
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except KeyError:
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self.terminal = None
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else:
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self.trdist = TerminalDistReporter(config)
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config.pluginmanager.register(self.trdist, "terminaldistreporter")
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@property
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def session_finished(self):
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"""Return True if the distributed session has finished
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This means all nodes have executed all test items. This is
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used to by pytest_runtestloop to break out of it's loop.
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"""
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return bool(self.shuttingdown and not self._active_nodes)
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def report_line(self, line):
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if self.terminal and self.config.option.verbose >= 0:
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self.terminal.write_line(line)
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@pytest.mark.trylast
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def pytest_sessionstart(self, session):
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"""Creates and starts the nodes.
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The nodes are setup to put their events onto self.queue. As
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soon as nodes start they will emit the slave_slaveready event.
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"""
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self.nodemanager = NodeManager(self.config)
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nodes = self.nodemanager.setup_nodes(putevent=self.queue.put)
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self._active_nodes.update(nodes)
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def pytest_sessionfinish(self, session):
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"""Shutdown all nodes."""
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nm = getattr(self, 'nodemanager', None) # if not fully initialized
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if nm is not None:
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nm.teardown_nodes()
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def pytest_collection(self):
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# prohibit collection of test items in master process
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return True
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def pytest_runtestloop(self):
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numnodes = len(self.nodemanager.specs)
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dist = self.config.getvalue("dist")
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if dist == "load":
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self.sched = LoadScheduling(numnodes, log=self.log,
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config=self.config)
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elif dist == "each":
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self.sched = EachScheduling(numnodes, log=self.log)
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else:
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assert 0, dist
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self.shouldstop = False
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while not self.session_finished:
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self.loop_once()
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if self.shouldstop:
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raise Interrupted(str(self.shouldstop))
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return True
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def loop_once(self):
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"""Process one callback from one of the slaves."""
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while 1:
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try:
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eventcall = self.queue.get(timeout=2.0)
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break
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except queue.Empty:
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continue
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callname, kwargs = eventcall
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assert callname, kwargs
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method = "slave_" + callname
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call = getattr(self, method)
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self.log("calling method", method, kwargs)
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call(**kwargs)
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if self.sched.tests_finished():
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self.triggershutdown()
|
|
|
|
#
|
|
# callbacks for processing events from slaves
|
|
#
|
|
|
|
def slave_slaveready(self, node, slaveinfo):
|
|
"""Emitted when a node first starts up.
|
|
|
|
This adds the node to the scheduler, nodes continue with
|
|
collection without any further input.
|
|
"""
|
|
node.slaveinfo = slaveinfo
|
|
node.slaveinfo['id'] = node.gateway.id
|
|
node.slaveinfo['spec'] = node.gateway.spec
|
|
self.config.hook.pytest_testnodeready(node=node)
|
|
if self.shuttingdown:
|
|
node.shutdown()
|
|
else:
|
|
self.sched.addnode(node)
|
|
|
|
def slave_slavefinished(self, node):
|
|
"""Emitted when node executes its pytest_sessionfinish hook.
|
|
|
|
Removes the node from the scheduler.
|
|
|
|
The node might not be the scheduler if it had not emitted
|
|
slaveready before shutdown was triggered.
|
|
"""
|
|
self.config.hook.pytest_testnodedown(node=node, error=None)
|
|
if node.slaveoutput['exitstatus'] == 2: # keyboard-interrupt
|
|
self.shouldstop = "%s received keyboard-interrupt" % (node,)
|
|
self.slave_errordown(node, "keyboard-interrupt")
|
|
return
|
|
if node in self.sched.nodes:
|
|
crashitem = self.sched.remove_node(node)
|
|
assert not crashitem, (crashitem, node)
|
|
self._active_nodes.remove(node)
|
|
|
|
def slave_errordown(self, node, error):
|
|
"""Emitted by the SlaveController when a node dies."""
|
|
self.config.hook.pytest_testnodedown(node=node, error=error)
|
|
try:
|
|
crashitem = self.sched.remove_node(node)
|
|
except KeyError:
|
|
pass
|
|
else:
|
|
if crashitem:
|
|
self.handle_crashitem(crashitem, node)
|
|
self.report_line("Replacing failed node %s" % node.gateway.id)
|
|
self._clone_node(node)
|
|
self._active_nodes.remove(node)
|
|
|
|
def slave_collectionfinish(self, node, ids):
|
|
"""Slave has finished test collection.
|
|
|
|
This adds the collection for this node to the scheduler. If
|
|
the scheduler indicates collection is finished (i.e. all
|
|
initial nodes have submitted their collection), then tells the
|
|
scheduler to schedule the collected items. When initiating
|
|
scheduling the first time it logs which scheduler is in use.
|
|
"""
|
|
if self.shuttingdown:
|
|
return
|
|
self.sched.addnode_collection(node, ids)
|
|
if self.terminal:
|
|
self.trdist.setstatus(node.gateway.spec, "[%d]" % (len(ids)))
|
|
if self.sched.collection_is_completed:
|
|
if self.terminal and not self.sched.haspending():
|
|
self.trdist.ensure_show_status()
|
|
self.terminal.write_line("")
|
|
self.terminal.write_line("scheduling tests via %s" % (
|
|
self.sched.__class__.__name__))
|
|
self.sched.init_distribute()
|
|
|
|
def slave_logstart(self, node, nodeid, location):
|
|
"""Emitted when a node calls the pytest_runtest_logstart hook."""
|
|
self.config.hook.pytest_runtest_logstart(
|
|
nodeid=nodeid, location=location)
|
|
|
|
def slave_testreport(self, node, rep):
|
|
"""Emitted when a node calls the pytest_runtest_logreport hook.
|
|
|
|
If the node indicates it is finished with a test item remove
|
|
the item from the pending list in the scheduler.
|
|
"""
|
|
if rep.when == "call" or (rep.when == "setup" and not rep.passed):
|
|
self.sched.remove_item(node, rep.item_index, rep.duration)
|
|
#self.report_line("testreport %s: %s" %(rep.id, rep.status))
|
|
rep.node = node
|
|
self.config.hook.pytest_runtest_logreport(report=rep)
|
|
self._handlefailures(rep)
|
|
|
|
def slave_collectreport(self, node, rep):
|
|
"""Emitted when a node calls the pytest_collectreport hook."""
|
|
if rep.failed:
|
|
self._failed_slave_collectreport(node, rep)
|
|
|
|
def _clone_node(self, node):
|
|
"""Return new node based on an existing one.
|
|
|
|
This is normally for when a node died, this will copy the spec
|
|
of the existing node and create a new one with a new id. The
|
|
new node will have been setup so will start calling the
|
|
"slave_*" hooks and do work soon.
|
|
"""
|
|
spec = node.gateway.spec
|
|
spec.id = None
|
|
self.nodemanager.group.allocate_id(spec)
|
|
node = self.nodemanager.setup_node(spec, self.queue.put)
|
|
self._active_nodes.add(node)
|
|
return node
|
|
|
|
def _failed_slave_collectreport(self, node, rep):
|
|
# Check we haven't already seen this report (from
|
|
# another slave).
|
|
if rep.longrepr not in self._failed_collection_errors:
|
|
self._failed_collection_errors[rep.longrepr] = True
|
|
self.config.hook.pytest_collectreport(report=rep)
|
|
self._handlefailures(rep)
|
|
|
|
def _handlefailures(self, rep):
|
|
if rep.failed:
|
|
self.countfailures += 1
|
|
if self.maxfail and self.countfailures >= self.maxfail:
|
|
self.shouldstop = "stopping after %d failures" % (
|
|
self.countfailures)
|
|
|
|
def triggershutdown(self):
|
|
self.log("triggering shutdown")
|
|
self.shuttingdown = True
|
|
for node in self.sched.nodes:
|
|
node.shutdown()
|
|
|
|
def handle_crashitem(self, nodeid, slave):
|
|
# XXX get more reporting info by recording pytest_runtest_logstart?
|
|
# XXX count no of failures and retry N times
|
|
runner = self.config.pluginmanager.getplugin("runner")
|
|
fspath = nodeid.split("::")[0]
|
|
msg = "Slave %r crashed while running %r" % (slave.gateway.id, nodeid)
|
|
rep = runner.TestReport(nodeid, (fspath, None, fspath),
|
|
(), "failed", msg, "???")
|
|
rep.node = slave
|
|
self.config.hook.pytest_runtest_logreport(report=rep)
|
|
|
|
|
|
class TerminalDistReporter:
|
|
def __init__(self, config):
|
|
self.config = config
|
|
self.tr = config.pluginmanager.getplugin("terminalreporter")
|
|
self._status = {}
|
|
self._lastlen = 0
|
|
|
|
def write_line(self, msg):
|
|
self.tr.write_line(msg)
|
|
|
|
def ensure_show_status(self):
|
|
if not self.tr.hasmarkup:
|
|
self.write_line(self.getstatus())
|
|
|
|
def setstatus(self, spec, status, show=True):
|
|
self._status[spec.id] = status
|
|
if show and self.tr.hasmarkup:
|
|
self.rewrite(self.getstatus())
|
|
|
|
def getstatus(self):
|
|
parts = ["%s %s" %(spec.id, self._status[spec.id])
|
|
for spec in self._specs]
|
|
return " / ".join(parts)
|
|
|
|
def rewrite(self, line, newline=False):
|
|
pline = line + " " * max(self._lastlen-len(line), 0)
|
|
if newline:
|
|
self._lastlen = 0
|
|
pline += "\n"
|
|
else:
|
|
self._lastlen = len(line)
|
|
self.tr.rewrite(pline, bold=True)
|
|
|
|
def pytest_xdist_setupnodes(self, specs):
|
|
self._specs = specs
|
|
for spec in specs:
|
|
self.setstatus(spec, "I", show=False)
|
|
self.setstatus(spec, "I", show=True)
|
|
self.ensure_show_status()
|
|
|
|
def pytest_xdist_newgateway(self, gateway):
|
|
if self.config.option.verbose > 0:
|
|
rinfo = gateway._rinfo()
|
|
version = "%s.%s.%s" % rinfo.version_info[:3]
|
|
self.rewrite("[%s] %s Python %s cwd: %s" % (
|
|
gateway.id, rinfo.platform, version, rinfo.cwd),
|
|
newline=True)
|
|
self.setstatus(gateway.spec, "C")
|
|
|
|
def pytest_testnodeready(self, node):
|
|
if self.config.option.verbose > 0:
|
|
d = node.slaveinfo
|
|
infoline = "[%s] Python %s" %(
|
|
d['id'],
|
|
d['version'].replace('\n', ' -- '),)
|
|
self.rewrite(infoline, newline=True)
|
|
self.setstatus(node.gateway.spec, "ok")
|
|
|
|
def pytest_testnodedown(self, node, error):
|
|
if not error:
|
|
return
|
|
self.write_line("[%s] node down: %s" %(node.gateway.id, error))
|
|
|
|
#def pytest_xdist_rsyncstart(self, source, gateways):
|
|
# targets = ",".join([gw.id for gw in gateways])
|
|
# msg = "[%s] rsyncing: %s" %(targets, source)
|
|
# self.write_line(msg)
|
|
#def pytest_xdist_rsyncfinish(self, source, gateways):
|
|
# targets = ", ".join(["[%s]" % gw.id for gw in gateways])
|
|
# self.write_line("rsyncfinish: %s -> %s" %(source, targets))
|
|
|