summaryrefslogtreecommitdiff
path: root/yarn
blob: d67c115fe1fb2f3dc57fc5c15cb538378f6e9b76 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
#!/usr/bin/env python
# Copyright 2013  Lars Wirzenius
#
# 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/>.
#
# =*= License: GPL-3+ =*=


import cliapp
import collections
import locale
import logging
import os
import re
import shutil
import sys
import tempfile
import time
import ttystatus

import yarnlib


class YarnRunner(cliapp.Application):

    def add_settings(self):
        self.settings.boolean(
            ['no-act', 'dry-run', 'pretend', 'n'],
            'do not actually run any tests, merely print what would be run')

        self.settings.boolean(
            ['quiet', 'q'],
            'be quiet, avoid progress reporting, only show errors')

        self.settings.boolean(
            ['verbose', 'v'],
            'make progress reporting be more verbose ("wall of text"), '
                'instead of a one-line status info; this is turned '
                'automatically if there is not terminal')

        self.settings.string_list(
            ['shell-library', 's'],
            'include a shell library for the IMPLEMENTS sections to use')

        self.settings.string_list(
            ['run', 'r'],
            'run only SCENARIO (this option can be repeated)',
            metavar='SCENARIO')

        self.settings.string(
            ['tempdir'],
            'use DIR as the temporary directory for tests; '
                'it should be empty or not exist',
            metavar='DIR')

        self.settings.string_list(
            ['env'],
            'add NAME=VALUE to the environment when tests are run',
            metavar='NAME=VALUE')

        self.settings.boolean(
            ['snapshot'],
            'make snapshots of test working directory '
                'after each scenario step; you probably '
                'want to use this with --tempdir')

        self.settings.boolean(
            ['timings'],
            'report wall clock time for each scenario and step')

        self.settings.boolean(
            ['allow-missing-steps'],
            'allow scenarios to reference steps that do not exist, '
            'by warning about them, but otherwise ignoring the scenarios')

        self.settings.boolean(
            ['require-assumptions'],
            'require ASSUMING to always pass')

        self.settings.string(
            ['shell'],
            'run IMPLEMENTS using SHELL',
            metavar='SHELL',
            default='/bin/sh')

        self.settings.string_list(
            ['shell-arg'],
            'use ARG when running shell',
            metavar='ARG',
            default=['-xeu'])

        self.settings.boolean(
            ['cd-datadir'],
            'change to DATADIR when running commands',
            default=False)

        self.settings.boolean(
            ['stop-on-first-fail'],
            "stop if any scenario step fails, don't run more scenarios")

    def stdout(self, msg):
        self._write(sys.stdout, msg)

    def stderr(self, msg):
        self._write(sys.stderr, msg)

    def _write(self, output, msg):
        if isinstance(msg, unicode):
            msg = msg.encode(locale.getpreferredencoding())
        output.write(msg)
        output.flush()

    def info(self, indent, msg):
        if self.settings['verbose']:
            logging.info(msg)
            indent_size = 4
            self.stdout('%*s%s\n' % (indent * indent_size, '', msg))

    def warning(self, msg):
        if self.settings['verbose']:
            logging.warning(msg)
            self.stdout('WARNING: %s\n' % msg)
        elif not self.settings['quiet']:
            self.ts.notify('WARNING: %s' % msg)

    def error(self, msg):
        if self.settings['verbose']:
            logging.info(msg)
            self.stderr('%s\n' % msg)
        elif not self.settings['quiet']:
            self.ts.error(msg)

    def process_args(self, args):
        # Do we have tty? If not, turn on --verbose, unless --quiet.
        if not self.settings['quiet']:
            try:
                open('/dev/tty', 'w')
            except IOError:
                self.settings['verbose'] = True

        self.ts = ttystatus.TerminalStatus(period=0.001)
        if not self.settings['quiet'] and not self.settings['verbose']:
            self.ts.format(
                '%ElapsedTime() %Index(current_step,all_steps): '
                '%String(scenario_name): '
                '%String(step_name)')

        scenarios, implementations = self.parse_scenarios(args)
        self.check_there_are_scenarios(scenarios)
        self.check_for_duplicate_scenario_names(scenarios)
        self.check_for_thens(scenarios)
        scenarios = self.connect_implementations(scenarios, implementations)
        shell_prelude = self.load_shell_libraries()

        self.info(0, 'Found %d scenarios' % len(scenarios))

        all_steps = []
        for scenario in scenarios:
            all_steps.extend(scenario.steps)
        self.ts['all_steps'] = all_steps

        self.scenarios_run = 0
        self.skipped_for_assuming = 0
        self.steps_run = 0
        self.timings = []

        start_time = time.time()
        failed_scenarios = []
        for scenario in self.select_scenarios(scenarios):
            if not self.run_scenario(scenario, shell_prelude):
                failed_scenarios.append(scenario)
                if self.settings['stop-on-first-fail']:
                    break
        duration = time.time() - start_time

        if not self.settings['quiet']:
            self.ts.clear()
            self.ts.finish()

        if failed_scenarios:
            self.stderr('Failed scenarios:\n')
            for scenario in failed_scenarios:
                self.stderr('    - %s\n' % scenario.name)
            raise cliapp.AppException(
                'Test suite FAILED in %s scenarios' % len(failed_scenarios))

        if not self.settings['quiet']:
            self.stdout(
                'Scenario test suite PASS, with %d scenarios '
                '(%d total steps), '
                'in %.1f seconds\n' %
                (self.scenarios_run, self.steps_run, duration))
            if self.skipped_for_assuming:
                self.stdout(
                    'Scenarios SKIPPED due to ASSUMING step failing: %d\n'
                    % self.skipped_for_assuming)

        if self.settings['timings']:
            self.report_timings()

    def parse_scenarios(self, filenames):
        mdparser = yarnlib.MarkdownParser()
        for filename in filenames:
            self.info(0, 'Parsing scenario file %s' % filename)
            blocks = mdparser.parse_file(filename)

        block_parser = yarnlib.BlockParser()
        block_parser.parse_blocks(mdparser.blocks)

        return block_parser.scenarios, block_parser.implementations

    def check_there_are_scenarios(self, scenarios):
        if not scenarios:
            raise cliapp.AppException(
                'There are no scenarios; must have at least one.')

    def check_for_duplicate_scenario_names(self, scenarios):
        counts = collections.Counter()
        for s in scenarios:
            counts[s.name] += 1

        duplicates = [name for name in counts if counts[name] > 1]
        if duplicates:
            duplist = ''.join('  %s\n' % name for name in duplicates)
            raise cliapp.AppException(
                'There are scenarios with duplicate names:\n%s' % duplist)

    def check_for_thens(self, scenarios):
        no_thens = []
        for scenario in scenarios:
            for step in scenario.steps:
                if step.what == 'THEN':
                    break
            else:
                no_thens.append(scenario)

        if no_thens:
            raise cliapp.AppException(
                'Some scenarios have no THENs:\n%s' %
                ''.join('  "%s"\n' % s.name for s in no_thens))

    def connect_implementations(self, scenarios, implementations):
        new_list = []
        for scenario in scenarios:
            missing_step = False
            for step in scenario.steps:
                self.connect_implementation(
                    scenario, step, implementations)
                if step.implementation is None:
                    missing_step = True
            if not missing_step:
                new_list.append(scenario)
        return new_list

    def connect_implementation(self, scenario, step, implementations):
        matching = [i for i in implementations
                    if step.what == i.what and
                       self.implements_matches_step(i, step)]

        if len(matching) == 0:
            if self.settings['allow-missing-steps']:
                self.warning(
                    'Scenario %s has missing step %s %s' %
                    (scenario.name, step.what, step.text))
                return
            raise cliapp.AppException(
                'Scenario "%s", step "%s %s" has no matching '
                'implementation' %
                (scenario.name, step.what, step.text))
        if len(matching) > 1:
            s = '\n'.join(
                'IMPLEMENTS %s %s' % (i.what, i.regexp)
                for i in matching)
            raise cliapp.AppException(
                'Scenario "%s", step "%s %s" has more than one '
                'matching implementations:\n%s' %
                (scenario.name, step.what, step.text, s))

        assert step.implementation is None
        step.implementation = matching[0]

    def load_shell_libraries(self):
        if not self.settings['shell-library']:
            self.info(0, 'No shell libraries defined')
            return ''

        libs = []
        for filename in self.settings['shell-library']:
            self.info(0, 'Loading shell library %s' % filename)
            with open(filename) as f:
                text = f.read()
            libs.append('# Loaded from %s\n\n%s\n\n' % (filename, text))

        return ''.join(libs)

    def select_scenarios(self, scenarios):

        def normalise(s):
            return ' '.join(s.lower().split())

        def matches(a, b):
            return normalise(a) == normalise(b)

        if self.settings['run']:
            result = []
            for name in self.settings['run']:
                for s in scenarios:
                    if matches(s.name, name) and s not in result:
                        result.append(s)
                        break
                else:
                    raise cliapp.AppException(
                        'Requested scenario %s does not exist' %
                        name)
            return result

        return scenarios

    def run_scenario(self, scenario, shell_prelude):
        self.start_scenario_timing(scenario.name)
        started = time.time()

        self.info(0, 'Running scenario %s' % scenario.name)
        self.ts['scenario_name'] = scenario.name.encode('utf-8')
        self.ts.flush()
        self.scenarios_run += 1

        if self.settings['no-act']:
            self.info(0, 'Pretending everything went OK')
            for step in scenario.steps:
                self.ts['current_step'] = step
                self.ts.flush()
            self.remember_scenario_timing(time.time() - started)
            return True

        if self.settings['tempdir']:
            tempdir = os.path.abspath(self.settings['tempdir'])
            if not os.path.exists(tempdir):
                os.mkdir(tempdir)
        else:
            tempdir = tempfile.mkdtemp()

        os.mkdir(self.scenario_dir(tempdir, scenario))
        datadir = self.datadir(tempdir, scenario)
        os.mkdir(datadir)
        self.info(1, 'DATADIR is %s' % datadir)
        homedir = self.homedir(datadir)
        os.mkdir(homedir)
        self.info(1, 'HOME for tests is %s' % homedir)

        assuming = [s for s in scenario.steps if s.what == 'ASSUMING']
        cleanup = [s for s in scenario.steps if s.what == 'FINALLY']
        normal = [s for s in scenario.steps if s not in assuming + cleanup]

        ok = True
        step_number = 0

        for step in assuming:
            exit = self.run_step(datadir, scenario, step, shell_prelude, False)
            step_number += 1
            self.snapshot_datadir(
                tempdir, datadir, scenario, step_number, step)
            if self.settings['require-assumptions'] and exit != 0:
                ok = False
                break
            elif exit != 0:
                self.ts.notify(
                    'Skipping "%s" because "%s %s" failed' %
                    (scenario.name, step.what, step.text))
                self.skipped_for_assuming += 1
                break
        else:
            for step in normal:
                exit = self.run_step(
                    datadir, scenario, step, shell_prelude, True)
                step_number += 1
                self.snapshot_datadir(
                    tempdir, datadir, scenario, step_number, step)
                if exit != 0:
                    ok = False
                    break

            for step in cleanup:
                exit = self.run_step(
                    datadir, scenario, step, shell_prelude, True)
                step_number += 1
                self.snapshot_datadir(
                    tempdir, datadir, scenario, step_number, step)
                if exit != 0:
                    ok = False
                    break

        if not self.settings['snapshot']:
            shutil.rmtree(tempdir, ignore_errors=True)

        self.remember_scenario_timing(time.time() - started)
        return ok

    def homedir(self, datadir):
        return os.path.join(datadir, 'HOME')

    def clean_env(self):
        '''Return a clean environment for running tests.'''

        whitelisted = [
            'PATH',
        ]

        hardcoded = {
            'TERM': 'dumb',
            'SHELL': '/bin/sh',
            'LC_ALL': 'C',
            'USER': 'tomjon',
            'USERNAME': 'tomjon',
            'LOGNAME': 'tomjon',
        }

        env = {}

        for key in whitelisted:
            if key in os.environ:
                env[key] = os.environ[key]

        for key in hardcoded:
            env[key] = hardcoded[key]

        for option_arg in self.settings['env']:
            if '=' not in option_arg:
                raise cliapp.AppException(
                    '--env argument must contain "=" '
                    'to separate environment variable name and value')
            key, value = option_arg.split('=', 1)
            env[key] = value

        return env

    def run_step(self, datadir, scenario, step, shell_prelude, report_error):
        started = time.time()

        self.info(1, 'Running step "%s %s"' % (step.what, step.text))
        self.ts['current_step'] = step
        self.ts['step_name'] = '%s %s' % (step.what, step.text.encode('utf8'))
        self.ts.flush()
        self.steps_run += 1

        m = self.implements_matches_step(step.implementation, step)
        assert m is not None
        env = self.clean_env()
        env['DATADIR'] = datadir
        env['SRCDIR'] = os.getcwd()
        env['HOME'] = self.homedir(datadir)
        for i, match in enumerate(m.groups('')):
            env['MATCH_%d' % (i+1)] = match.encode('utf-8')
        self.add_srcdir_to_pythonpath(env, env['SRCDIR'])

        if self.settings['cd-datadir']:
            cwd = datadir
        else:
            cwd = '.'

        fd, shell_script = tempfile.mkstemp()
        os.close(fd)
        with open(shell_script, 'w') as f:
            f.write(shell_prelude)
            f.write(step.implementation.shell)
            f.flush()
        shell = self.settings['shell']
        shell_args = [x for x in self.settings['shell-arg'] if x]
        logging.debug('shell: %r', shell)
        logging.debug('shell_args: %r', shell_args)
        logging.debug('shell_script: %r', shell_script)
        exit, stdout, stderr = cliapp.runcmd_unchecked(
            [shell] + shell_args + [shell_script],
            env=env, cwd=cwd)
        os.remove(shell_script)

        logging.debug('Exit code: %d' % exit)
        if stdout:
            logging.debug('Standard output:\n%s' % self.indent(stdout))
        else:
            logging.debug('Standard output: empty')
        if stderr:
            logging.debug('Standard error:\n%s' % self.indent(stderr))
        else:
            logging.debug('Standard error: empty')

        if exit != 0 and report_error:
            self.error('ERROR: In scenario "%s"' % scenario.name)
            self.error('step "%s %s" failed,' % (step.what, step.text))
            self.error('with exit code %d:' % exit)
            self.error('Standard output from shell command:\n%s' %
                       self.indent(stdout))
            self.error('Standard error from shell command:\n%s' %
                       self.indent(stderr))

        self.remember_step_timing(
            '%s %s' % (step.what, step.text), time.time() - started)

        return exit

    def add_srcdir_to_pythonpath(self, env, srcdir):
        # Special handling of PYTHONPATH. Add $SRCDIR to it so that
        # Python IMPLEMENTS can use it. But only if --shell=python is
        # used. This is a bit of magic that hopefully won't surprise
        # users too much.

        if 'python' in self.settings['shell']:
            pythonpath = env.get('PYTHONPATH', None)
            if pythonpath:
                pythonpath += ':' + srcdir
            else:
                pythonpath = srcdir
            env['PYTHONPATH'] = pythonpath

    def scenario_dir(self, tempdir, scenario):
        return os.path.join(tempdir, self.nice(scenario.name))

    def datadir(self, tempdir, scenario):
        sd = self.scenario_dir(tempdir, scenario)
        return os.path.join(sd, 'datadir')

    def snapshot_dir(self, tempdir, scenario, step, step_number):
        sd = self.scenario_dir(tempdir, scenario)
        base = '%03d-%s-%s' % (step_number, step.what, self.nice(step.text))
        return os.path.join(sd, base)

    def snapshot_datadir(self, tempdir, datadir, scenario, step_number, step):
        if self.settings['snapshot']:
            snapshot = self.snapshot_dir(tempdir, scenario, step, step_number)
            exit, out, err = cliapp.runcmd_unchecked(
                ['cp', '-ax', datadir, snapshot])
            if exit != 0:
                logging.warning('Snapshot copy failed:\n%s\n%s' % (out, err))

    def nice(self, name):
        # Quote a scenario or step name so it forms a nice filename.
        nice_chars = "abcdefghijklmnopqrstuvwxyz"
        nice_chars += nice_chars.upper()
        nice_chars += "0123456789-."

        nice = []
        for c in name:
            if c in nice_chars:
                nice.append(c)
            elif not nice or nice[-1] != '_':
                nice.append('_')
        nice = ''.join(nice)
        return nice

    def implements_matches_step(self, implements, step):
        '''Return re.Match if implements matches the step.

        Otherwise, return None.

        '''

        m = re.match(implements.regexp, step.text, re.I)
        if m and m.end() != len(step.text):
            return None
        return m

    def indent(self, s):
        return ''.join('    %s\n' % line for line in s.splitlines())

    def start_scenario_timing(self, scenario_name):
        self.timings.append((scenario_name, None, []))

    def remember_scenario_timing(self, duration):
        scenario_name, _, step_tuples = self.timings[-1]
        self.timings[-1] = (scenario_name, duration, step_tuples)

    def remember_step_timing(self, step_name, step_duration):
        scenario_name, scenario_duration, step_tuples = self.timings[-1]
        step_tuples = step_tuples + [(step_name, step_duration)]
        self.timings[-1] = (scenario_name, scenario_duration, step_tuples)

    def report_timings(self):
        for scenario_name, scenario_duration, step_tuples in self.timings:
            self.stdout('%5.1f %s\n' % (scenario_duration, scenario_name))
            for step_name, step_duration in step_tuples:
                self.stdout('  %5.1f %s\n' % (step_duration, step_name))


YarnRunner(version=yarnlib.__version__).run()