aboutsummaryrefslogtreecommitdiffstats
path: root/resources/libraries/python/PapiExecutor.py
blob: 8261a5e33193de820bb0f4eba41ce5693c6d339f (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
# Copyright (c) 2019 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Python API executor library.
"""

import binascii
import json

from robot.api import logger

from resources.libraries.python.Constants import Constants
from resources.libraries.python.ssh import SSH, SSHTimeout
from resources.libraries.python.PapiHistory import PapiHistory


__all__ = ["PapiExecutor", "PapiResponse"]


class PapiResponse(object):
    """Class for metadata specifying the Papi reply, stdout, stderr and return
    code.
    """

    def __init__(self, papi_reply=None, stdout="", stderr="", requests=None):
        """Construct the Papi response by setting the values needed.

        TODO:
            Implement 'dump' analogue of verify_replies that would concatenate
            the values, so that call sites do not have to do that themselves.

        :param papi_reply: API reply from last executed PAPI command(s).
        :param stdout: stdout from last executed PAPI command(s).
        :param stderr: stderr from last executed PAPI command(s).
        :param requests: List of used PAPI requests. It is used while verifying
            replies. If None, expected replies must be provided for verify_reply
            and verify_replies methods.
        :type papi_reply: list or None
        :type stdout: str
        :type stderr: str
        :type requests: list
        """

        # API reply from last executed PAPI command(s).
        self.reply = papi_reply

        # stdout from last executed PAPI command(s).
        self.stdout = stdout

        # stderr from last executed PAPI command(s).
        self.stderr = stderr

        # List of used PAPI requests.
        self.requests = requests

        # List of expected PAPI replies. It is used while verifying replies.
        if self.requests:
            self.expected_replies = \
                ["{rqst}_reply".format(rqst=rqst) for rqst in self.requests]

    def __str__(self):
        """Return string with human readable description of the PapiResponse.

        :returns: Readable description.
        :rtype: str
        """
        return (
            "papi_reply={papi_reply},stdout={stdout},stderr={stderr},"
            "requests={requests}").format(
                papi_reply=self.reply, stdout=self.stdout, stderr=self.stderr,
                requests=self.requests)

    def __repr__(self):
        """Return string executable as Python constructor call.

        :returns: Executable constructor call.
        :rtype: str
        """
        return "PapiResponse({str})".format(str=str(self))

    def verify_reply(self, cmd_reply=None, idx=0,
                     err_msg="Failed to verify PAPI reply."):
        """Verify and return data from the PAPI response.

        Note: Use only with a simple request / reply command. In this case the
        PAPI reply includes 'retval' which is checked in this method.

        Do not use with 'dump' and 'vpp-stats' methods.

        Use if PAPI response includes only one command reply.

        Use it this way (preferred):

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add('show_version').get_replies().verify_reply()

        or if you must provide the expected reply (not recommended):

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add('show_version').get_replies().\
                verify_reply('show_version_reply')

        :param cmd_reply: PAPI reply. If None, list of 'requests' should have
            been provided to the __init__ method as pre-generated list of
            replies is used in this method in this case.
            The PapiExecutor._execute() method provides the requests
            automatically.
        :param idx: Index to PapiResponse.reply list.
        :param err_msg: The message used if the verification fails.
        :type cmd_reply: str
        :type idx: int
        :type err_msg: str or None
        :returns: Verified data from PAPI response.
        :rtype: dict
        :raises AssertionError: If the PAPI return value is not 0, so the reply
            is not valid.
        :raises KeyError, IndexError: If the reply does not have expected
            structure.
        """
        cmd_rpl = self.expected_replies[idx] if cmd_reply is None else cmd_reply

        data = self.reply[idx]['api_reply'][cmd_rpl]
        if data['retval'] != 0:
            raise AssertionError("{msg}\nidx={idx}, cmd_reply={reply}".
                                 format(msg=err_msg, idx=idx, reply=cmd_rpl))

        return data

    def verify_replies(self, cmd_replies=None,
                       err_msg="Failed to verify PAPI reply."):
        """Verify and return data from the PAPI response.

        Note: Use only with request / reply commands. In this case each
        PAPI reply includes 'retval' which is checked.

        Do not use with 'dump' and 'vpp-stats' methods.

        Use if PAPI response includes more than one command reply.

        Use it this way:

        with PapiExecutor(node) as papi_exec:
            papi_exec.add(cmd1, **args1).add(cmd2, **args2).add(cmd2, **args3).\
                get_replies(err_msg).verify_replies()

        or if you need the data from the PAPI response:

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add(cmd1, **args1).add(cmd2, **args2).\
                add(cmd2, **args3).get_replies(err_msg).verify_replies()

        or if you must provide the list of expected replies (not recommended):

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add(cmd1, **args1).add(cmd2, **args2).\
                add(cmd2, **args3).get_replies(err_msg).\
                verify_replies(cmd_replies=cmd_replies)

        :param cmd_replies: List of PAPI command replies. If None, list of
            'requests' should have been provided to the __init__ method as
            pre-generated list of replies is used in this method in this case.
            The PapiExecutor._execute() method provides the requests
            automatically.
        :param err_msg: The message used if the verification fails.
        :type cmd_replies: list of str or None
        :type err_msg: str
        :returns: List of verified data from PAPI response.
        :rtype list
        :raises AssertionError: If the PAPI response does not include at least
            one of specified command replies.
        """
        data = list()

        cmd_rpls = self.expected_replies if cmd_replies is None else cmd_replies

        if len(self.reply) != len(cmd_rpls):
            raise AssertionError(err_msg)
        for idx, cmd_reply in enumerate(cmd_rpls):
            data.append(self.verify_reply(cmd_reply, idx, err_msg))

        return data


class PapiExecutor(object):
    """Contains methods for executing VPP Python API commands on DUTs.

    Note: Use only with "with" statement, e.g.:

        with PapiExecutor(node) as papi_exec:
            papi_resp = papi_exec.add('show_version').get_replies(err_msg)

    This class processes three classes of VPP PAPI methods:
    1. simple request / reply: method='request',
    2. dump functions: method='dump',
    3. vpp-stats: method='stats'.

    The recommended ways of use are (examples):

    1. Simple request / reply

    a. One request with no arguments:

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add('show_version').get_replies().\
                verify_reply()

    b. Three requests with arguments, the second and the third ones are the same
       but with different arguments.

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add(cmd1, **args1).add(cmd2, **args2).\
                add(cmd2, **args3).get_replies(err_msg).verify_replies()

    2. Dump functions

        cmd = 'sw_interface_rx_placement_dump'
        with PapiExecutor(node) as papi_exec:
            papi_resp = papi_exec.add(cmd, sw_if_index=ifc['vpp_sw_index']).\
                get_dump(err_msg)

    3. vpp-stats

        path = ['^/if', '/err/ip4-input', '/sys/node/ip4-input']

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add(api_name='vpp-stats', path=path).get_stats()

        print('RX interface core 0, sw_if_index 0:\n{0}'.\
            format(data[0]['/if/rx'][0][0]))

        or

        path_1 = ['^/if', ]
        path_2 = ['^/if', '/err/ip4-input', '/sys/node/ip4-input']

        with PapiExecutor(node) as papi_exec:
            data = papi_exec.add('vpp-stats', path=path_1).\
                add('vpp-stats', path=path_2).get_stats()

        print('RX interface core 0, sw_if_index 0:\n{0}'.\
            format(data[1]['/if/rx'][0][0]))

        Note: In this case, when PapiExecutor method 'add' is used:
        - its parameter 'csit_papi_command' is used only to keep information
          that vpp-stats are requested. It is not further processed but it is
          included in the PAPI history this way:
          vpp-stats(path=['^/if', '/err/ip4-input', '/sys/node/ip4-input'])
          Always use csit_papi_command="vpp-stats" if the VPP PAPI method
          is "stats".
        - the second parameter must be 'path' as it is used by PapiExecutor
          method 'add'.
    """

    def __init__(self, node):
        """Initialization.

        :param node: Node to run command(s) on.
        :type node: dict
        """

        # Node to run command(s) on.
        self._node = node

        # The list of PAPI commands to be executed on the node.
        self._api_command_list = list()

        self._ssh = SSH()

    def __enter__(self):
        try:
            self._ssh.connect(self._node)
        except IOError:
            raise RuntimeError("Cannot open SSH connection to host {host} to "
                               "execute PAPI command(s)".
                               format(host=self._node["host"]))
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self._ssh.disconnect(self._node)

    def add(self, csit_papi_command="vpp-stats", **kwargs):
        """Add next command to internal command list; return self.

        The argument name 'csit_papi_command' must be unique enough as it cannot
        be repeated in kwargs.

        :param csit_papi_command: VPP API command.
        :param kwargs: Optional key-value arguments.
        :type csit_papi_command: str
        :type kwargs: dict
        :returns: self, so that method chaining is possible.
        :rtype: PapiExecutor
        """
        PapiHistory.add_to_papi_history(self._node, csit_papi_command, **kwargs)
        self._api_command_list.append(dict(api_name=csit_papi_command,
                                           api_args=kwargs))
        return self

    def get_stats(self, err_msg="Failed to get statistics.", timeout=120):
        """Get VPP Stats from VPP Python API.

        :param err_msg: The message used if the PAPI command(s) execution fails.
        :param timeout: Timeout in seconds.
        :type err_msg: str
        :type timeout: int
        :returns: Requested VPP statistics.
        :rtype: list
        """

        paths = [cmd['api_args']['path'] for cmd in self._api_command_list]
        self._api_command_list = list()

        stdout, _ = self._execute_papi(
            paths, method='stats', err_msg=err_msg, timeout=timeout)

        return json.loads(stdout)

    def get_replies(self, err_msg="Failed to get replies.",
                    process_reply=True, ignore_errors=False, timeout=120):
        """Get reply/replies from VPP Python API.

        :param err_msg: The message used if the PAPI command(s) execution fails.
        :param process_reply: Process PAPI reply if True.
        :param ignore_errors: If true, the errors in the reply are ignored.
        :param timeout: Timeout in seconds.
        :type err_msg: str
        :type process_reply: bool
        :type ignore_errors: bool
        :type timeout: int
        :returns: Papi response including: papi reply, stdout, stderr and
            return code.
        :rtype: PapiResponse
        """
        return self._execute(
            method='request', process_reply=process_reply,
            ignore_errors=ignore_errors, err_msg=err_msg, timeout=timeout)

    def get_dump(self, err_msg="Failed to get dump.",
                 process_reply=True, ignore_errors=False, timeout=120):
        """Get dump from VPP Python API.

        :param err_msg: The message used if the PAPI command(s) execution fails.
        :param process_reply: Process PAPI reply if True.
        :param ignore_errors: If true, the errors in the reply are ignored.
        :param timeout: Timeout in seconds.
        :type err_msg: str
        :type process_reply: bool
        :type ignore_errors: bool
        :type timeout: int
        :returns: Papi response including: papi reply, stdout, stderr and
            return code.
        :rtype: PapiResponse
        """
        return self._execute(
            method='dump', process_reply=process_reply,
            ignore_errors=ignore_errors, err_msg=err_msg, timeout=timeout)

    def execute_should_pass(self, err_msg="Failed to execute PAPI command.",
                            process_reply=True, ignore_errors=False,
                            timeout=120):
        """Execute the PAPI commands and check the return code.
        Raise exception if the PAPI command(s) failed.

        IMPORTANT!
        Do not use this method in L1 keywords. Use:
        - get_replies()
        - get_dump()
        This method will be removed soon.

        :param err_msg: The message used if the PAPI command(s) execution fails.
        :param process_reply: Indicate whether or not to process PAPI reply.
        :param ignore_errors: If true, the errors in the reply are ignored.
        :param timeout: Timeout in seconds.
        :type err_msg: str
        :type process_reply: bool
        :type ignore_errors: bool
        :type timeout: int
        :returns: Papi response including: papi reply, stdout, stderr and
            return code.
        :rtype: PapiResponse
        :raises AssertionError: If PAPI command(s) execution failed.
        """
        # TODO: Migrate callers to get_replies and delete this method.
        return self.get_replies(
            process_reply=process_reply, ignore_errors=ignore_errors,
            err_msg=err_msg, timeout=timeout)

    @staticmethod
    def _process_api_data(api_d):
        """Process API data for smooth converting to JSON string.

        Apply binascii.hexlify() method for string values.

        :param api_d: List of APIs with their arguments.
        :type api_d: list
        :returns: List of APIs with arguments pre-processed for JSON.
        :rtype: list
        """

        def process_value(val):
            """Process value.

            :param val: Value to be processed.
            :type val: object
            :returns: Processed value.
            :rtype: dict or str or int
            """
            if isinstance(val, dict):
                val_dict = dict()
                for val_k, val_v in val.iteritems():
                    val_dict[str(val_k)] = process_value(val_v)
                return val_dict
            else:
                return binascii.hexlify(val) if isinstance(val, str) else val

        api_data_processed = list()
        for api in api_d:
            api_args_processed = dict()
            for a_k, a_v in api["api_args"].iteritems():
                api_args_processed[str(a_k)] = process_value(a_v)
            api_data_processed.append(dict(api_name=api["api_name"],
                                           api_args=api_args_processed))
        return api_data_processed

    @staticmethod
    def _revert_api_reply(api_r):
        """Process API reply / a part of API reply.

        Apply binascii.unhexlify() method for unicode values.

        TODO: Implement complex solution to process of replies.

        :param api_r: API reply.
        :type api_r: dict
        :returns: Processed API reply / a part of API reply.
        :rtype: dict
        """
        reply_dict = dict()
        reply_value = dict()
        for reply_key, reply_v in api_r.iteritems():
            for a_k, a_v in reply_v.iteritems():
                reply_value[a_k] = binascii.unhexlify(a_v) \
                    if isinstance(a_v, unicode) else a_v
            reply_dict[reply_key] = reply_value
        return reply_dict

    def _process_reply(self, api_reply):
        """Process API reply.

        :param api_reply: API reply.
        :type api_reply: dict or list of dict
        :returns: Processed API reply.
        :rtype: list or dict
        """
        if isinstance(api_reply, list):
            reverted_reply = [self._revert_api_reply(a_r) for a_r in api_reply]
        else:
            reverted_reply = self._revert_api_reply(api_reply)
        return reverted_reply

    def _execute_papi(self, api_data, method='request', err_msg="",
                      timeout=120):
        """Execute PAPI command(s) on remote node and store the result.

        :param api_data: List of APIs with their arguments.
        :param method: VPP Python API method. Supported methods are: 'request',
            'dump' and 'stats'.
        :param err_msg: The message used if the PAPI command(s) execution fails.
        :param timeout: Timeout in seconds.
        :type api_data: list
        :type method: str
        :type err_msg: str
        :type timeout: int
        :returns: Stdout and stderr.
        :rtype: 2-tuple of str
        :raises SSHTimeout: If PAPI command(s) execution has timed out.
        :raises RuntimeError: If PAPI executor failed due to another reason.
        :raises AssertionError: If PAPI command(s) execution has failed.
        """

        if not api_data:
            RuntimeError("No API data provided.")

        json_data = json.dumps(api_data) if method == "stats" \
            else json.dumps(self._process_api_data(api_data))

        cmd = "{fw_dir}/{papi_provider} --method {method} --data '{json}'".\
            format(fw_dir=Constants.REMOTE_FW_DIR,
                   papi_provider=Constants.RESOURCES_PAPI_PROVIDER,
                   method=method,
                   json=json_data)
        try:
            ret_code, stdout, stderr = self._ssh.exec_command_sudo(
                cmd=cmd, timeout=timeout)
        except SSHTimeout:
            logger.error("PAPI command(s) execution timeout on host {host}:"
                         "\n{apis}".format(host=self._node["host"],
                                           apis=api_data))
            raise
        except Exception:
            raise RuntimeError("PAPI command(s) execution on host {host} "
                               "failed: {apis}".format(host=self._node["host"],
                                                       apis=api_data))
        if ret_code != 0:
            raise AssertionError(err_msg)

        return stdout, stderr

    def _execute(self, method='request', process_reply=True,
                 ignore_errors=False, err_msg="", timeout=120):
        """Turn internal command list into proper data and execute; return
        PAPI response.

        This method also clears the internal command list.

        IMPORTANT!
        Do not use this method in L1 keywords. Use:
        - get_stats()
        - get_replies()
        - get_dump()

        :param method: VPP Python API method. Supported methods are: 'request',
            'dump' and 'stats'.
        :param process_reply: Process PAPI reply if True.
        :param ignore_errors: If true, the errors in the reply are ignored.
        :param err_msg: The message used if the PAPI command(s) execution fails.
        :param timeout: Timeout in seconds.
        :type method: str
        :type process_reply: bool
        :type ignore_errors: bool
        :type err_msg: str
        :type timeout: int
        :returns: Papi response including: papi reply, stdout, stderr and
            return code.
        :rtype: PapiResponse
        :raises KeyError: If the reply is not correct.
        """

        local_list = self._api_command_list

        # Clear first as execution may fail.
        self._api_command_list = list()

        stdout, stderr = self._execute_papi(
            local_list, method=method, err_msg=err_msg, timeout=timeout)
        papi_reply = list()
        if process_reply:
            try:
                json_data = json.loads(stdout)
            except ValueError:
                logger.error("An error occured while processing the PAPI "
                             "request:\n{rqst}".format(rqst=local_list))
                raise
            for data in json_data:
                try:
                    api_reply_processed = dict(
                        api_name=data["api_name"],
                        api_reply=self._process_reply(data["api_reply"]))
                except KeyError:
                    if ignore_errors:
                        continue
                    else:
                        raise
                papi_reply.append(api_reply_processed)

        # Log processed papi reply to be able to check API replies changes
        logger.debug("Processed PAPI reply: {reply}".format(reply=papi_reply))

        return PapiResponse(
            papi_reply=papi_reply, stdout=stdout, stderr=stderr,
            requests=[rqst["api_name"] for rqst in local_list])