workflow-state command back compat.

changes.d/5237.feat.md

@@ -0,0 +1,2 @@
+Back-compat: allow workflow-state xtriggers (and the `cylc workflow-state`
+command) to read Cylc 7 databases.

cylc/flow/dbstatecheck.py

@@ -56,10 +56,13 @@ class CylcWorkflowDBChecker:
         ],
     }
 
-    def __init__(self, rund, workflow):
-        db_path = expand_path(
-            rund, workflow, "log", CylcWorkflowDAO.DB_FILE_BASE_NAME
-        )
+    def __init__(self, rund, workflow, db_path=None):
+        # (Explicit dp_path arg is to make testing easier).
+        if db_path is None:
+            # Infer DB path from workflow name and run dir.
+            db_path = expand_path(
+                rund, workflow, "log", CylcWorkflowDAO.DB_FILE_BASE_NAME
+            )
         if not os.path.exists(db_path):
             raise OSError(errno.ENOENT, os.strerror(errno.ENOENT), db_path)
         self.conn = sqlite3.connect(db_path, timeout=10.0)
@@ -73,7 +76,7 @@ def display_maps(res):
                 sys.stdout.write((", ").join(row) + "\n")
 
     def get_remote_point_format(self):
-        """Query a remote workflow database for a 'cycle point format' entry"""
+        """Query a workflow database for a 'cycle point format' entry"""
         for row in self.conn.execute(
             rf'''
                 SELECT
@@ -87,6 +90,24 @@ def get_remote_point_format(self):
         ):
             return row[0]
 
+    def get_remote_point_format_compat(self):
+        """Query a Cylc 7 suite database for a 'cycle point format' entry.
+
+        Back compat for Cylc 8 workflow state triggers targeting Cylc 7 DBs.
+        """
+        for row in self.conn.execute(
+            rf'''
+                SELECT
+                    value
+                FROM
+                    {CylcWorkflowDAO.TABLE_SUITE_PARAMS}
+                WHERE
+                    key==?
+            ''',  # nosec (table name is code constant)
+            ['cycle_point_format']
+        ):
+            return row[0]
+
     def state_lookup(self, state):
         """allows for multiple states to be searched via a status alias"""
         if state in self.STATE_ALIASES:

cylc/flow/rundb.py

@@ -179,6 +179,13 @@ class CylcWorkflowDAO:
     TABLE_BROADCAST_STATES = "broadcast_states"
     TABLE_INHERITANCE = "inheritance"
     TABLE_WORKFLOW_PARAMS = "workflow_params"
+    # BACK COMPAT: suite_params
+    # This Cylc 7 DB table is needed to allow workflow-state
+    # xtriggers (and the `cylc workflow-state` command) to
+    # work with Cylc 7 workflows.
+    # url: https://github.com/cylc/cylc-flow/issues/5236
+    # remove at: 8.x
+    TABLE_SUITE_PARAMS = "suite_params"
     TABLE_WORKFLOW_FLOWS = "workflow_flows"
     TABLE_WORKFLOW_TEMPLATE_VARS = "workflow_template_vars"
     TABLE_TASK_JOBS = "task_jobs"

cylc/flow/scripts/workflow_state.py

@@ -115,7 +115,13 @@
             sys.stderr.write('\n')
 
         if connected and self.args['cycle']:
-            fmt = self.checker.get_remote_point_format()
+            try:
+                fmt = self.checker.get_remote_point_format()
+            except sqlite3.OperationalError as exc:
+                try:
+                    fmt = self.checker.get_remote_point_format_compat()
+                except sqlite3.OperationalError:
+                    raise exc  # original error
             if fmt:
                 my_parser = TimePointParser()
                 my_point = my_parser.parse(self.args['cycle'], dump_format=fmt)

cylc/flow/xtriggers/workflow_state.py

@@ -90,7 +90,13 @@
     except (OSError, sqlite3.Error):
         # Failed to connect to DB; target workflow may not be started.
         return (False, None)
-    fmt = checker.get_remote_point_format()
+    try:
+        fmt = checker.get_remote_point_format()
+    except sqlite3.OperationalError as exc:
+        try:
+            fmt = checker.get_remote_point_format_compat()
+        except sqlite3.OperationalError:
+            raise exc  # original error
     if fmt:
         my_parser = TimePointParser()
         point = str(my_parser.parse(point, dump_format=fmt))

tests/unit/test_workflow_db_mgr.py

@@ -26,6 +26,7 @@
     CylcWorkflowDAO,
     WorkflowDatabaseManager,
 )
+from cylc.flow.dbstatecheck import CylcWorkflowDBChecker
 
 
 @pytest.fixture
@@ -116,3 +117,22 @@ def test_check_workflow_db_compat(_setup_db, capsys):
 
     with pytest.raises(ServiceFileError, match='99.99'):
         WorkflowDatabaseManager.check_db_compatibility(pri_path)
+
+
+def test_cylc_7_db_wflow_params_table(_setup_db):
+    """Test back-compat needed by workflow state xtrigger for Cylc 7 DBs."""
+    ptformat = "CCYY"
+    create = r'CREATE TABLE suite_params(key TEXT, value TEXT)'
+    insert = (
+        r'INSERT INTO suite_params VALUES'
+        rf'("cycle_point_format", "{ptformat}")'
+    )
+    db_file_name = _setup_db([create, insert])
+    checker = CylcWorkflowDBChecker('foo', 'bar', db_path=db_file_name)
+
+    with pytest.raises(
+        sqlite3.OperationalError, match="no such table: workflow_params"
+    ):
+        checker.get_remote_point_format()
+
+    assert checker.get_remote_point_format_compat() == ptformat

tests/unit/xtriggers/test_workflow_state.py

@@ -14,10 +14,12 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from pathlib import Path
+import sqlite3
 from typing import Callable
 from unittest.mock import Mock
 
-
+from cylc.flow.workflow_files import WorkflowFiles
 from cylc.flow.xtriggers.workflow_state import workflow_state
 from ..conftest import MonkeyMock
 
@@ -38,3 +40,47 @@ def test_inferred_run(tmp_run_dir: Callable, monkeymock: MonkeyMock):
     _, results = workflow_state(id_, task='precious', point='3000')
     mock_db_checker.assert_called_once_with(cylc_run_dir, expected_workflow_id)
     assert results['workflow'] == expected_workflow_id
+
+
+def test_back_compat(tmp_run_dir):
+    """Test workflow_state xtrigger backwards compatibility with Cylc 7
+    database."""
+    id_ = 'celebrimbor'
+    c7_run_dir: Path = tmp_run_dir(id_)
+    (c7_run_dir / WorkflowFiles.FLOW_FILE).rename(
+        c7_run_dir / WorkflowFiles.SUITE_RC
+    )
+    db_file = c7_run_dir / 'log' / 'db'
+    db_file.parent.mkdir(exist_ok=True)
+    # Note: cannot use CylcWorkflowDAO here as creating outdated DB
+    conn = sqlite3.connect(str(db_file))
+    try:
+        conn.execute(r"""
+            CREATE TABLE suite_params(key TEXT, value TEXT, PRIMARY KEY(key));
+        """)
+        conn.execute(r"""
+            CREATE TABLE task_states(
+                name TEXT, cycle TEXT, time_created TEXT, time_updated TEXT,
+                submit_num INTEGER, status TEXT, PRIMARY KEY(name, cycle)
+            );
+        """)
+        conn.executemany(
+            r'INSERT INTO "suite_params" VALUES(?,?);',
+            [('cylc_version', '7.8.12'),
+             ('cycle_point_format', '%Y'),
+             ('cycle_point_tz', 'Z')]
+        )
+        conn.execute(r"""
+           INSERT INTO "task_states" VALUES(
+               'mithril','2012','2023-01-30T18:19:15Z','2023-01-30T18:19:15Z',
+               0,'succeeded'
+            );
+        """)
+        conn.commit()
+    finally:
+        conn.close()
+
+    satisfied, _ = workflow_state(id_, task='mithril', point='2012')
+    assert satisfied
+    satisfied, _ = workflow_state(id_, task='arkenstone', point='2012')
+    assert not satisfied