[Notes] [Git][BuildStream/buildstream][Qinusty/skipped-rework] 4 commits: Rework Skipped usage

[Qinusty <gitlab mg gitlab com>]

Title: GitLab

Qinusty pushed to branch Qinusty/skipped-rework at BuildStream / buildstream

Commits:

• 2b76df33
  by Josh Smith at 2018-09-08T16:40:16Z

  Rework Skipped usage
  
  The SKIPPED message type is now used to indicate the end of a task which
  was successful without having to perform the given task.
  
  This overhauls the use of `Queue.done()` and therefore queues do not
  need to provide a processed/skipped return value from `done()`. Instead
  this is replaced with the action of raising a `SkipJob` exception from
  within `Queue.process()`.
  

• 9c6c66b2
  by Josh Smith at 2018-09-08T16:40:21Z

  tests.py: Test skip on push
  
  Adds a test to ensure that BuildStream alerts the user of a skipped push
  when the remote already has the artifact cached.
  

• 0a703cdc
  by Josh Smith at 2018-09-08T16:40:21Z

  element.py: Remove redundant timed_activity
  
  This removes the timed_activity for an element _push action. This is
  unnecessary as the job is already being timed elsewhere.
  

• 80b265cf
  by Josh Smith at 2018-09-08T16:40:21Z

  element.py: reword Downloaded to Pulled
  
  This changes the info phrase for when an artifact is pulled from a
  remote server.
  

13 changed files:

• buildstream/_artifactcache/cascache.py
• buildstream/_exceptions.py
• buildstream/_scheduler/jobs/job.py
• buildstream/_scheduler/queues/buildqueue.py
• buildstream/_scheduler/queues/fetchqueue.py
• buildstream/_scheduler/queues/pullqueue.py
• buildstream/_scheduler/queues/pushqueue.py
• buildstream/_scheduler/queues/queue.py
• buildstream/_scheduler/queues/trackqueue.py
• buildstream/element.py
• tests/frontend/pull.py
• tests/frontend/push.py
• tests/testutils/runcli.py

Changes:

buildstream/_artifactcache/cascache.py

---

...	...	@@ -252,7 +252,7 @@ class CASCache(ArtifactCache):
252	252	else:
253	253	self.context.message(Message(
254	254	None,
255		- MessageType.SKIPPED,
	255	+ MessageType.INFO,
256	256	"Remote ({}) does not have {} cached".format(
257	257	remote.spec.url, element._get_brief_display_key())
258	258	))
...	...	@@ -363,7 +363,7 @@ class CASCache(ArtifactCache):
363	363	if skipped_remote:
364	364	self.context.message(Message(
365	365	None,
366		- MessageType.SKIPPED,
	366	+ MessageType.INFO,
367	367	"Remote ({}) already has {} cached".format(
368	368	remote.spec.url, element._get_brief_display_key())
369	369	))

buildstream/_exceptions.py

---

...	...	@@ -309,3 +309,17 @@ class StreamError(BstError):
309	309	class AppError(BstError):
310	310	def __init__(self, message, detail=None, reason=None):
311	311	super().__init__(message, detail=detail, domain=ErrorDomain.APP, reason=reason)
	312	+
	313	+
	314	+# SkipJob
	315	+#
	316	+# Raised from a child process within a job when the job should be
	317	+# considered skipped by the parent process.
	318	+#
	319	+class SkipJob(Exception):
	320	+ def __init__(self, *, detail=""):
	321	+ super().__init__()
	322	+ self._detail = detail
	323	+
	324	+ def __str__(self):
	325	+ return self._detail

buildstream/_scheduler/jobs/job.py

---

...	...	@@ -31,7 +31,7 @@ import multiprocessing
31	31	import psutil
32	32
33	33	# BuildStream toplevel imports
34		-from ..._exceptions import ImplError, BstError, set_last_task_error
	34	+from ..._exceptions import ImplError, BstError, set_last_task_error, SkipJob
35	35	from ..._message import Message, MessageType, unconditional_messages
36	36	from ... import _signals, utils
37	37
...	...	@@ -40,6 +40,7 @@ from ... import _signals, utils
40	40	RC_OK = 0
41	41	RC_FAIL = 1
42	42	RC_PERM_FAIL = 2
	43	+RC_SKIPPED = 3
43	44
44	45
45	46	# Used to distinguish between status messages and return values
...	...	@@ -117,7 +118,7 @@ class Job():
117	118	self._max_retries = max_retries # Maximum number of automatic retries
118	119	self._result = None # Return value of child action in the parent
119	120	self._tries = 0 # Try count, for retryable jobs
120		-
	121	+ self._skipped = False # Indicate whether the job was skipped.
121	122	# If False, a retry will not be attempted regardless of whether _tries is less than _max_retries.
122	123	#
123	124	self._retry_flag = True
...	...	@@ -275,6 +276,10 @@ class Job():
275	276	def set_task_id(self, task_id):
276	277	self._task_id = task_id
277	278
	279	+ @property
	280	+ def skipped(self):
	281	+ return self._skipped
	282	+
278	283	#######################################################
279	284	# Abstract Methods #
280	285	#######################################################
...	...	@@ -396,6 +401,13 @@ class Job():
396	401	try:
397	402	# Try the task action
398	403	result = self.child_process()
	404	+ except SkipJob as e:
	405	+ elapsed = datetime.datetime.now() - starttime
	406	+ self.message(MessageType.SKIPPED, str(e),
	407	+ elapsed=elapsed, logfile=filename)
	408	+
	409	+ # Alert parent of skip by return code
	410	+ self._child_shutdown(RC_SKIPPED)
399	411	except BstError as e:
400	412	elapsed = datetime.datetime.now() - starttime
401	413	self._retry_flag = e.temporary
...	...	@@ -441,6 +453,7 @@ class Job():
441	453	self.message(MessageType.SUCCESS, self.action_name, elapsed=elapsed,
442	454	logfile=filename)
443	455
	456	+ # XXX Verify below.
444	457	# Shutdown needs to stay outside of the above context manager,
445	458	# make sure we dont try to handle SIGTERM while the process
446	459	# is already busy in sys.exit()
...	...	@@ -547,14 +560,19 @@ class Job():
547	560	# We don't want to retry if we got OK or a permanent fail.
548	561	# This is set in _child_action but must also be set for the parent.
549	562	#
550		- self._retry_flag = returncode not in (RC_OK, RC_PERM_FAIL)
	563	+ self._retry_flag = returncode not in (RC_OK, RC_PERM_FAIL, RC_SKIPPED)
551	564
552	565	if self._retry_flag and (self._tries <= self._max_retries) and not self._scheduler.terminated:
553	566	self.spawn()
554	567	return
555	568
556		- self.parent_complete(returncode == RC_OK, self._result)
557		- self._scheduler.job_completed(self, returncode == RC_OK)
	569	+ if returncode == RC_SKIPPED:
	570	+ # Set _skipped for parent process.
	571	+ self._skipped = True
	572	+
	573	+ success = (returncode in (RC_OK, RC_SKIPPED))
	574	+ self.parent_complete(success, self._result)
	575	+ self._scheduler.job_completed(self, success)
558	576
559	577	# _parent_process_envelope()
560	578	#

buildstream/_scheduler/queues/buildqueue.py

---

...	...	@@ -54,12 +54,7 @@ class BuildQueue(Queue):
54	54	detail=detail, action_name=self.action_name,
55	55	elapsed=timedelta(seconds=0),
56	56	logfile=logfile)
57		- job = ElementJob(self._scheduler, self.action_name,
58		- logfile, element=element, queue=self,
59		- resources=self.resources,
60		- action_cb=self.process,
61		- complete_cb=self._job_done,
62		- max_retries=self._max_retries)
	57	+ job = self._create_job(element)
63	58	self._done_queue.append(job)
64	59	self.failed_elements.append(element)
65	60	self._scheduler._job_complete_callback(job, False)
...	...	@@ -109,5 +104,3 @@ class BuildQueue(Queue):
109	104	# This has to be done after _assemble_done, such that the
110	105	# element may register its cache key as required
111	106	self._check_cache_size(job, element)
112		-
113		- return True

buildstream/_scheduler/queues/fetchqueue.py

---

...	...	@@ -70,13 +70,8 @@ class FetchQueue(Queue):
70	70	return QueueStatus.READY
71	71
72	72	def done(self, _, element, result, success):
	73	+ if success:
	74	+ element._update_state()
73	75
74		- if not success:
75		- return False
76		-
77		- element._update_state()
78		-
79		- # Successful fetch, we must be CACHED now
80		- assert element._get_consistency() == Consistency.CACHED
81		-
82		- return True
	76	+ # Successful fetch, we must be CACHED now
	77	+ assert element._get_consistency() == Consistency.CACHED

buildstream/_scheduler/queues/pullqueue.py

---

...	...	@@ -21,6 +21,7 @@
21	21	# Local imports
22	22	from . import Queue, QueueStatus
23	23	from ..resources import ResourceType
	24	+from ..._exceptions import SkipJob
24	25
25	26
26	27	# A queue which pulls element artifacts
...	...	@@ -33,7 +34,12 @@ class PullQueue(Queue):
33	34
34	35	def process(self, element):
35	36	# returns whether an artifact was downloaded or not
36		- return element._pull()
	37	+ pulled = element._pull()
	38	+
	39	+ if not pulled:
	40	+ raise SkipJob(detail=self.action_name)
	41	+
	42	+ return pulled
37	43
38	44	def status(self, element):
39	45	# state of dependencies may have changed, recalculate element state
...	...	@@ -53,17 +59,10 @@ class PullQueue(Queue):
53	59	return QueueStatus.SKIP
54	60
55	61	def done(self, _, element, result, success):
	62	+ if success:
	63	+ element._pull_done()
56	64
57		- if not success:
58		- return False
59		-
60		- element._pull_done()
61		-
62		- # Build jobs will check the "approximate" size first. Since we
63		- # do not get an artifact size from pull jobs, we have to
64		- # actually check the cache size.
65		- self._scheduler._check_cache_size_real()
66		-
67		- # Element._pull() returns True if it downloaded an artifact,
68		- # here we want to appear skipped if we did not download.
69		- return result
	65	+ # Build jobs will check the "approximate" size first. Since we
	66	+ # do not get an artifact size from pull jobs, we have to
	67	+ # actually check the cache size.
	68	+ self._scheduler._check_cache_size_real()

buildstream/_scheduler/queues/pushqueue.py

---

...	...	@@ -21,6 +21,7 @@
21	21	# Local imports
22	22	from . import Queue, QueueStatus
23	23	from ..resources import ResourceType
	24	+from ..._exceptions import SkipJob
24	25
25	26
26	27	# A queue which pushes element artifacts
...	...	@@ -33,20 +34,15 @@ class PushQueue(Queue):
33	34
34	35	def process(self, element):
35	36	# returns whether an artifact was uploaded or not
36		- return element._push()
	37	+ pushed = element._push()
	38	+
	39	+ if not pushed:
	40	+ raise SkipJob(detail=self.action_name)
	41	+
	42	+ return pushed
37	43
38	44	def status(self, element):
39	45	if element._skip_push():
40	46	return QueueStatus.SKIP
41	47
42	48	return QueueStatus.READY
43		-
44		- def done(self, _, element, result, success):
45		-
46		- if not success:
47		- return False
48		-
49		- # Element._push() returns True if it uploaded an artifact,
50		- # here we want to appear skipped if the remote already had
51		- # the artifact.
52		- return result

buildstream/_scheduler/queues/queue.py

---

...	...	@@ -136,10 +136,6 @@ class Queue():
136	136	# success (bool): True if the process() implementation did not
137	137	# raise any exception
138	138	#
139		- # Returns:
140		- # (bool): True if the element should appear to be processsed,
141		- # Otherwise False will count the element as "skipped"
142		- #
143	139	def done(self, job, element, result, success):
144	140	pass
145	141
...	...	@@ -158,20 +154,8 @@ class Queue():
158	154	if not elts:
159	155	return
160	156
161		- # Note: The internal lists work with jobs. This is not
162		- # reflected in any external methods (except
163		- # pop/peek_ready_jobs).
164		- def create_job(element):
165		- logfile = self._element_log_path(element)
166		- return ElementJob(self._scheduler, self.action_name,
167		- logfile, element=element, queue=self,
168		- resources=self.resources,
169		- action_cb=self.process,
170		- complete_cb=self._job_done,
171		- max_retries=self._max_retries)
172		-
173	157	# Place skipped elements directly on the done queue
174		- jobs = [create_job(elt) for elt in elts]
	158	+ jobs = [self._create_job(elt) for elt in elts]
175	159	skip = [job for job in jobs if self.status(job.element) == QueueStatus.SKIP]
176	160	wait = [job for job in jobs if job not in skip]
177	161
...	...	@@ -308,8 +292,7 @@ class Queue():
308	292	# and determine if it should be considered as processed
309	293	# or skipped.
310	294	try:
311		- processed = self.done(job, element, result, success)
312		-
	295	+ self.done(job, element, result, success)
313	296	except BstError as e:
314	297
315	298	# Report error and mark as failed
...	...	@@ -339,7 +322,7 @@ class Queue():
339	322	self._done_queue.append(job)
340	323
341	324	if success:
342		- if processed:
	325	+ if not job.skipped:
343	326	self.processed_elements.append(element)
344	327	else:
345	328	self.skipped_elements.append(element)
...	...	@@ -360,3 +343,15 @@ class Queue():
360	343	logfile = "{key}-{action}".format(key=key, action=action)
361	344
362	345	return os.path.join(project.name, element.normal_name, logfile)
	346	+
	347	+ # Note: The internal lists work with jobs. This is not
	348	+ # reflected in any external methods (except
	349	+ # pop/peek_ready_jobs).
	350	+ def _create_job(self, element):
	351	+ logfile = self._element_log_path(element)
	352	+ return ElementJob(self._scheduler, self.action_name,
	353	+ logfile, element=element, queue=self,
	354	+ resources=self.resources,
	355	+ action_cb=self.process,
	356	+ complete_cb=self._job_done,
	357	+ max_retries=self._max_retries)

buildstream/_scheduler/queues/trackqueue.py

---

...	...	@@ -49,20 +49,10 @@ class TrackQueue(Queue):
49	49	return QueueStatus.READY
50	50
51	51	def done(self, _, element, result, success):
	52	+ if success:
	53	+ # Set the new refs in the main process one by one as they complete
	54	+ for unique_id, new_ref in result:
	55	+ source = _plugin_lookup(unique_id)
	56	+ source._save_ref(new_ref)
52	57
53		- if not success:
54		- return False
55		-
56		- changed = False
57		-
58		- # Set the new refs in the main process one by one as they complete
59		- for unique_id, new_ref in result:
60		- source = _plugin_lookup(unique_id)
61		- # We appear processed if at least one source has changed
62		- if source._save_ref(new_ref):
63		- changed = True
64		-
65		- element._tracking_done()
66		-
67		- # We'll appear as a skipped element if tracking resulted in no change
68		- return changed
	58	+ element._tracking_done()

buildstream/element.py

---

...	...	@@ -1746,7 +1746,7 @@ class Element(Plugin):
1746	1746
1747	1747	# Notify successfull download
1748	1748	display_key = self._get_brief_display_key()
1749		- self.info("Downloaded artifact {}".format(display_key))
	1749	+ self.info("Pulled artifact {}".format(display_key))
1750	1750	return True
1751	1751
1752	1752	# _skip_push():
...	...	@@ -1785,16 +1785,15 @@ class Element(Plugin):
1785	1785	self.warn("Not pushing tainted artifact.")
1786	1786	return False
1787	1787
1788		- display_key = self._get_brief_display_key()
1789		- with self.timed_activity("Pushing artifact {}".format(display_key)):
1790		- # Push all keys used for local commit
1791		- pushed = self.__artifacts.push(self, self.__get_cache_keys_for_commit())
1792		- if not pushed:
1793		- return False
	1788	+ # Push all keys used for local commit
	1789	+ pushed = self.__artifacts.push(self, self.__get_cache_keys_for_commit())
	1790	+ if not pushed:
	1791	+ return False
1794	1792
1795		- # Notify successful upload
1796		- self.info("Pushed artifact {}".format(display_key))
1797		- return True
	1793	+ # Notify successful upload
	1794	+ display_key = self._get_brief_display_key()
	1795	+ self.info("Pushed artifact {}".format(display_key))
	1796	+ return True
1798	1797
1799	1798	# _shell():
1800	1799	#

tests/frontend/pull.py

---

...	...	@@ -356,4 +356,5 @@ def test_pull_missing_notifies_user(caplog, cli, tmpdir, datafiles):
356	356	assert not result.get_pulled_elements(), \
357	357	"No elements should have been pulled since the cache was empty"
358	358
359		- assert "SKIPPED Remote ({}) does not have".format(share.repo) in result.stderr
	359	+ assert "INFO Remote ({}) does not have".format(share.repo) in result.stderr
	360	+ assert "SKIPPED Pull" in result.stderr

tests/frontend/push.py

---

...	...	@@ -386,3 +386,25 @@ def test_push_cross_junction(cli, tmpdir, datafiles):
386	386
387	387	cache_key = cli.get_element_key(project, 'junction.bst:import-etc.bst')
388	388	assert share.has_artifact('subtest', 'import-etc.bst', cache_key)
	389	+
	390	+
	391	+@pytest.mark.datafiles(DATA_DIR)
	392	+def test_push_already_cached(caplog, cli, tmpdir, datafiles):
	393	+ project = os.path.join(datafiles.dirname, datafiles.basename)
	394	+ caplog.set_level(1)
	395	+
	396	+ with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
	397	+
	398	+ cli.configure({
	399	+ 'artifacts': {'url': share.repo, 'push': True}
	400	+ })
	401	+ result = cli.run(project=project, args=['build', 'target.bst'])
	402	+
	403	+ result.assert_success()
	404	+ assert "SKIPPED Push" not in result.stderr
	405	+
	406	+ result = cli.run(project=project, args=['push', 'target.bst'])
	407	+
	408	+ assert not result.get_pushed_elements(), "No elements should have been pushed since the cache was populated"
	409	+ assert "INFO Remote ({}) already has ".format(share.repo) in result.stderr
	410	+ assert "SKIPPED Push" in result.stderr

tests/testutils/runcli.py

---

...	...	@@ -178,7 +178,7 @@ class Result():
178	178	return list(pushed)
179	179
180	180	def get_pulled_elements(self):
181		- pulled = re.findall(r'\[\s*pull:(\S+)\s*\]\s*INFO\s*Downloaded artifact', self.stderr)
	181	+ pulled = re.findall(r'\[\s*pull:(\S+)\s*\]\s*INFO\s*Pulled artifact', self.stderr)
182	182	if pulled is None:
183	183	return []
184	184

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