cylc pause

.github/workflows/bash.yml

@@ -44,9 +44,9 @@ jobs:
             tests/functional/cylc-poll/15-job-st-file-no-batch.t \
             tests/functional/events/28-inactivity.t \
             tests/functional/events/34-task-abort.t \
-            tests/functional/hold-release/12-hold-then-retry.t \
             tests/functional/job-file-trap/00-sigusr1.t \
             tests/functional/job-file-trap/02-pipefail.t \
+            tests/functional/pause-resume/12-pause-then-retry.t \
             tests/functional/shutdown/09-now2.t \
             tests/functional/shutdown/13-no-port-file-check.t \
             tests/functional/shutdown/14-no-dir-check.t

CHANGES.md

@@ -66,10 +66,18 @@ queueing logic centralized.
 `cylc register` has been replaced by `cylc install`
 ([#4000](https://github.com/cylc/cylc-flow/pull/4000)).
 
+Added a new command: `cylc clean`, for removing stopped workflows on the local
+and any remote filesystems ([#3961](https://github.com/cylc/cylc-flow/pull/3961),
+[#4017](https://github.com/cylc/cylc-flow/pull/4017)).
+
 `cylc run` and `cylc restart` have been replaced by `cylc play`, simplifying
 how workflows are restarted
 ([#4040](https://github.com/cylc/cylc-flow/pull/4040)).
 
+`cylc pause` and `cylc play` are now used to pause and resume workflows,
+respectively. `cylc hold` and `cylc release` now only hold and release tasks,
+not the whole workflow. ([#4076](https://github.com/cylc/cylc-flow/pull/4076))
+
 "Implicit"/"naked" tasks (tasks that do not have an explicit definition in
 `flow.cylc[runtime]`) are now disallowed by default
 ([#4109](https://github.com/cylc/cylc-flow/pull/4109)). You can allow them by
@@ -167,11 +175,6 @@ hierarchy and ability to set site config directory.
 [#3883](https://github.com/cylc/cylc-flow/pull/3883) - Added a new workflow
 config option `[scheduling]stop after cycle point`.
 
-[#3961](https://github.com/cylc/cylc-flow/pull/3961),
-[#4017](https://github.com/cylc/cylc-flow/pull/4017) - Added a new command:
-`cylc clean`, for removing stopped workflows on the local and any remote
-filesystems.
-
 [#3913](https://github.com/cylc/cylc-flow/pull/3913) - Added the ability to
 use plugins to parse suite templating variables and additional files to
 install. Only one such plugin exists at the time of writing, designed to

cylc/flow/cycling/loader.py

@@ -19,7 +19,9 @@
 Each task may have multiple sequences, e.g. 12-hourly and 6-hourly.
 """
 
-from . import integer
+from typing import Optional, Type
+
+from . import PointBase, integer
 from . import iso8601
 from metomi.isodatetime.data import Calendar
 
@@ -58,18 +60,19 @@ class DefaultCycler:
 
     """Store the default TYPE for Cyclers."""
 
-    TYPE = None
+    TYPE: str
 
 
-def get_point(*args, **kwargs):
+def get_point(
+    value: str, cycling_type: Optional[str] = None
+) -> Optional[PointBase]:
     """Return a cylc.flow.cycling.PointBase-derived object from a string."""
-    if args[0] is None:
+    if value is None:
         return None
-    cycling_type = kwargs.pop("cycling_type", DefaultCycler.TYPE)
-    return get_point_cls(cycling_type=cycling_type)(*args, **kwargs)
+    return get_point_cls(cycling_type=cycling_type)(value)
 
 
-def get_point_cls(cycling_type=None):
+def get_point_cls(cycling_type: Optional[str] = None) -> Type[PointBase]:
     """Return the cylc.flow.cycling.PointBase-derived class we're using."""
     if cycling_type is None:
         cycling_type = DefaultCycler.TYPE

cylc/flow/etc/cylc-bash-completion

@@ -38,7 +38,7 @@ _cylc() {
     cur="${COMP_WORDS[COMP_CWORD]}"
     sec="${COMP_WORDS[1]}"
     opts="$(cylc scan -t name 2>/dev/null)"
-    suite_cmds="broadcast|bcast|cat-log|check-versions|clean|compare|diff|dump|edit|ext-trigger|external-trigger|get-suite-config|get-config|get-suite-version|get-cylc-version|graph|hold|insert|install|kill|list|log|ls|tui|ping|play|poll|print|reinstall|release|unhold|reload|remove|report-timings|reset|scan|search|grep|set-verbosity|show|set-outputs|stop|shutdown|single|suite-state|test-battery|trigger|validate|view|warranty"
+    suite_cmds="broadcast|bcast|cat-log|check-versions|clean|compare|diff|dump|edit|ext-trigger|external-trigger|get-suite-config|get-config|get-suite-version|get-cylc-version|graph|hold|insert|install|kill|list|log|ls|tui|pause|ping|play|poll|print|reinstall|release|unhold|reload|remove|report-timings|reset|scan|search|grep|set-verbosity|show|set-outputs|stop|shutdown|single|suite-state|test-battery|trigger|validate|view|warranty"
 
 
     if [[ ${COMP_CWORD} -eq 1 ]]; then

cylc/flow/network/resolvers.py

@@ -21,6 +21,7 @@
 import logging
 import queue
 from time import time
+from typing import Iterable, Tuple, TYPE_CHECKING
 from uuid import uuid4
 
 from graphene.utils.str_converters import to_snake_case
@@ -34,6 +35,11 @@
     NodesEdges, PROXY_NODES, SUB_RESOLVERS, parse_node_id, sort_elements
 )
 
+if TYPE_CHECKING:
+    from cylc.flow.data_store_mgr import DataStoreMgr
+    from cylc.flow.scheduler import Scheduler
+
+
 logger = logging.getLogger(__name__)
 
 DELTA_SLEEP_INTERVAL = 0.5
@@ -438,15 +444,11 @@ async def subscribe_delta(self, root, info, args):
 class Resolvers(BaseResolvers):
     """Workflow Service context GraphQL query and mutation resolvers."""
 
-    schd = None
+    schd: 'Scheduler'
 
-    def __init__(self, data, **kwargs):
+    def __init__(self, data: 'DataStoreMgr', schd: 'Scheduler') -> None:
         super().__init__(data)
-
-        # Set extra attributes
-        for key, value in kwargs.items():
-            if hasattr(self, key):
-                setattr(self, key, value)
+        self.schd = schd
 
     # Mutations
     async def mutator(self, *m_args):
@@ -520,16 +522,19 @@ def broadcast(
                 cutoff)
         raise ValueError('Unsupported broadcast mode')
 
-    def hold(self, tasks=None, time=None):
-        """Hold the workflow."""
-        self.schd.command_queue.put((
-            'hold',
-            tuple(),
-            filter_none({
-                'tasks': tasks or None,
-                'time': time
-            })
-        ))
+    def hold(self, tasks: Iterable[str]) -> Tuple[bool, str]:
+        """Hold tasks."""
+        self.schd.command_queue.put(('hold', (tasks,), {}))
+        return (True, 'Command queued')
+
+    def set_hold_point(self, point: str) -> Tuple[bool, str]:
+        """Set workflow hold after cycle point."""
+        self.schd.command_queue.put(('set_hold_point', (point,), {}))
+        return (True, 'Command queued')
+
+    def pause(self) -> Tuple[bool, str]:
+        """Pause the workflow."""
+        self.schd.command_queue.put(('pause', tuple(), {}))
         return (True, 'Command queued')
 
     def kill_tasks(self, tasks):
@@ -649,15 +654,19 @@ def reload_suite(self):
         self.schd.command_queue.put(("reload_suite", (), {}))
         return (True, 'Command queued')
 
-    def release(self, tasks=None):
-        """Release (un-hold) the workflow."""
-        self.schd.command_queue.put((
-            "release",
-            (),
-            filter_none({
-                'ids': tasks
-            })
-        ))
+    def release(self, tasks: Iterable[str]) -> Tuple[bool, str]:
+        """Release held tasks."""
+        self.schd.command_queue.put(('release', (tasks,), {}))
+        return (True, 'Command queued')
+
+    def release_hold_point(self) -> Tuple[bool, str]:
+        """Release all tasks and unset workflow hold point."""
+        self.schd.command_queue.put(('release_hold_point', tuple(), {}))
+        return (True, 'Command queued')
+
+    def resume(self) -> Tuple[bool, str]:
+        """Resume the workflow."""
+        self.schd.command_queue.put(('resume', tuple(), {}))
         return (True, 'Command queued')
 
     def set_verbosity(self, level):

cylc/flow/network/scan.py

@@ -343,8 +343,8 @@ async def graphql_query(flow, fields, filters=None):
                # state must be running
                [('state',), 'running']
 
-               # state must be running or held
-               [('state',), ('running', 'held')]
+               # state must be running or paused
+               [('state',), ('running', 'paused')]
 
     """
     query = f'query {{ workflows(ids: ["{flow["name"]}"]) {{ {fields} }} }}'

cylc/flow/network/schema.py

@@ -1532,23 +1532,33 @@ class Arguments:
     result = GenericScalar()
 
 
-class Hold(Mutation):
+class SetHoldPoint(Mutation):
     class Meta:
         description = sstrip('''
-            Hold a workflow or tasks within it.
+            Set workflow hold after cycle point. All tasks after this point
+            will be held.
         ''')
-        resolver = partial(mutator, command='hold')
+        resolver = partial(mutator, command='set_hold_point')
 
     class Arguments:
         workflows = List(WorkflowID, required=True)
-        tasks = List(
-            NamespaceIDGlob,
-            description='Hold the specified tasks rather than the workflow.'
+        point = CyclePoint(
+            description='Hold all tasks after the specified cycle point.',
+            required=True
         )
-        time = TimePoint(description=sstrip('''
-            Get the workflow to hold after the specified wallclock time
-            has passed.
-        '''))
+
+    result = GenericScalar()
+
+
+class Pause(Mutation):
+    class Meta:
+        description = sstrip('''
+            Pause a workflow.
+        ''')
+        resolver = partial(mutator, command='pause')
+
+    class Arguments:
+        workflows = List(WorkflowID, required=True)
 
     result = GenericScalar()
 
@@ -1596,23 +1606,30 @@ class Arguments:
     result = GenericScalar()
 
 
-class Release(Mutation):
+class ReleaseHoldPoint(Mutation):
     class Meta:
         description = sstrip('''
-            Release a held workflow or tasks within it.
+            Release all tasks and unset the workflow hold point, if set.
+        ''')
+        resolver = partial(mutator, command='release_hold_point')
 
-            See also the opposite command `hold`.
+    class Arguments:
+        workflows = List(WorkflowID, required=True)
+
+    result = GenericScalar()
+
+
+class Resume(Mutation):
+    class Meta:
+        description = sstrip('''
+            Resume a paused workflow.
+
+            See also the opposite command `pause`.
         ''')
-        resolver = partial(mutator, command='release')
+        resolver = partial(mutator, command='resume')
 
     class Arguments:
         workflows = List(WorkflowID, required=True)
-        tasks = List(
-            NamespaceIDGlob,
-            description=sstrip('''
-                Release matching tasks rather than the workflow as whole.
-            ''')
-        )
 
     result = GenericScalar()
 
@@ -1763,6 +1780,24 @@ class Arguments:
     result = GenericScalar()
 
 
+class Hold(Mutation, TaskMutation):
+    class Meta:
+        description = sstrip('''
+            Hold tasks within a workflow.
+        ''')
+        resolver = partial(mutator, command='hold')
+
+
+class Release(Mutation, TaskMutation):
+    class Meta:
+        description = sstrip('''
+            Release held tasks within a workflow.
+
+            See also the opposite command `hold`.
+        ''')
+        resolver = partial(mutator, command='release')
+
+
 class Kill(Mutation, TaskMutation):
     # TODO: This should be a job mutation?
     class Meta:
@@ -1851,18 +1886,22 @@ class Mutations(ObjectType):
     # workflow actions
     broadcast = _mut_field(Broadcast)
     ext_trigger = _mut_field(ExtTrigger)
-    hold = _mut_field(Hold)
     message = _mut_field(Message)
+    pause = _mut_field(Pause)
     ping = _mut_field(Ping)
-    release = _mut_field(Release)
     reload = _mut_field(Reload)
+    resume = _mut_field(Resume)
     set_verbosity = _mut_field(SetVerbosity)
     set_graph_window_extent = _mut_field(SetGraphWindowExtent)
     stop = _mut_field(Stop)
+    set_hold_point = _mut_field(SetHoldPoint)
+    release_hold_point = _mut_field(ReleaseHoldPoint)
 
     # task actions
+    hold = _mut_field(Hold)
     kill = _mut_field(Kill)
     poll = _mut_field(Poll)
+    release = _mut_field(Release)
     remove = _mut_field(Remove)
     set_outputs = _mut_field(SetOutputs)
     trigger = _mut_field(Trigger)