validate: fail on bad task event handler templates

lib/cylc/config.py

@@ -84,6 +84,8 @@ class SuiteConfig(object):
     """Class for suite configuration items and derived quantities."""
 
     Q_DEFAULT = 'default'
+    TASK_EVENT_TMPL_KEYS = (
+        'event', 'suite', 'point', 'name', 'submit_num', 'id', 'message')
 
     def __init__(self, suite, fpath, template_vars=None,
                  owner=None, run_mode='live', is_validate=False, strict=False,
@@ -1373,7 +1375,27 @@ def check_tasks(self):
                     ('deprecated: [runtime][%s][job]shell=%s: '
                      'use of ksh to run cylc task job file') %
                     (taskdef.name, job_shell))
-
+            # Check custom event handler templates compat with task meta
+            if taskdef.rtconfig['events']:
+                subs = dict((key, key) for key in self.TASK_EVENT_TMPL_KEYS)
+                for key, value in self.cfg['meta'].items():
+                    subs['suite_' + key.lower()] = value
+                subs.update(taskdef.rtconfig['meta'])
+                try:
+                    subs['task_url'] = subs.pop('URL')
+                except KeyError:
+                    pass
+                for key, values in taskdef.rtconfig['events'].items():
+                    if values and (
+                            key == 'handlers' or key.endswith(' handler')):
+                        for value in values:
+                            try:
+                                value % subs
+                            except (KeyError, ValueError) as exc:
+                                raise SuiteConfigError(
+                                    'ERROR: bad task event handler template'
+                                    ' %s: %s: %s' % (
+                                        taskdef.name, value, repr(exc)))
         if cylc.flags.verbose:
             OUT.info("Checking for defined tasks not used in the graph")
             for name in self.cfg['runtime']:

tests/events/36-task-event-bad-custom-template.t

@@ -17,14 +17,17 @@
 #-------------------------------------------------------------------------------
 # Test custom task event handler bad template
 . "$(dirname "$0")/test_header"
-set_test_number 3
+set_test_number 4
 
 OPT_SET=
 if [[ "${TEST_NAME_BASE}" == *-globalcfg ]]; then
     create_test_globalrc '' ''
 fi
 install_suite "${TEST_NAME_BASE}" "${TEST_NAME_BASE}"
-run_ok "${TEST_NAME_BASE}-validate" cylc validate "${SUITE_NAME}"
+run_fail "${TEST_NAME_BASE}-validate" cylc validate "${SUITE_NAME}"
+cmp_ok "${TEST_NAME_BASE}-validate.stderr" <<'__ERR__'
+"ERROR: bad task event handler template t1: echo %(rubbish)s: KeyError('rubbish',)"
+__ERR__
 suite_run_ok "${TEST_NAME_BASE}-run" \
     cylc run --reference-test --debug "${SUITE_NAME}"
 LOG="${SUITE_RUN_DIR}/log/suite/log"

tests/validate/65-bad-task-event-handler-tmpl.t

@@ -0,0 +1,55 @@
+#!/bin/bash
+# THIS FILE IS PART OF THE CYLC SUITE ENGINE.
+# Copyright (C) 2008-2017 NIWA
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#-------------------------------------------------------------------------------
+# Test validation fails on bad task event handler templates.
+. "$(dirname "$0")/test_header"
+
+set_test_number 4
+
+TEST_NAME="${TEST_NAME_BASE}-bad-key"
+cat >'suite.rc' <<'__SUITE_RC__'
+[scheduling]
+    [[dependencies]]
+        graph=t1
+[runtime]
+    [[t1]]
+        script=true
+        [[[events]]]
+            failed handler = echo %(id)s, echo %(rubbish)s
+__SUITE_RC__
+run_fail "${TEST_NAME}" cylc validate 'suite.rc'
+cmp_ok "${TEST_NAME}.stderr" <<'__ERR__'
+"ERROR: bad task event handler template t1: echo %(rubbish)s: KeyError('rubbish',)"
+__ERR__
+
+TEST_NAME="${TEST_NAME_BASE}-bad-value"
+cat >'suite.rc' <<'__SUITE_RC__'
+[scheduling]
+    [[dependencies]]
+        graph=t1
+[runtime]
+    [[t1]]
+        script=true
+        [[[events]]]
+            failed handler = echo %(ids
+__SUITE_RC__
+run_fail "${TEST_NAME}" cylc validate 'suite.rc'
+cmp_ok "${TEST_NAME}.stderr" <<'__ERR__'
+"ERROR: bad task event handler template t1: echo %(ids: ValueError('incomplete format key',)"
+__ERR__
+
+exit