aboutsummaryrefslogtreecommitdiffstats
path: root/resources/libraries/python/VatExecutor.py
blob: 136b7cc0ef3ebb1494bf7580e64047dbc4f2f574 (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
# Copyright (c) 2016 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.
from ssh import SSH
from robot.api import logger
from constants import Constants
import json

__all__ = ['VatExecutor']


def cleanup_vat_json_output(json_output):
    """Return VAT json output cleaned from VAT clutter.

    Clean up VAT json output from clutter like vat# prompts and such
    :param json_output: cluttered json output.
    :return: cleaned up output json string
    """

    retval = json_output
    clutter = ['vat#', 'dump_interface_table error: Misc']
    for garbage in clutter:
        retval = retval.replace(garbage, '')
    return retval


class VatExecutor(object):
    def __init__(self):
        self._stdout = None
        self._stderr = None
        self._ret_code = None

    def execute_script(self, vat_name, node, timeout=10, json_out=True):
        """Copy local_path script to node, execute it and return result.

        :param vat_name: name of the vat script file. Only the file name of
            the script is required, the resources path is prepended
            automatically.
        :param node: node to execute the VAT script on.
        :param timeout: seconds to allow the script to run.
        :param json_out: require json output.
        :return: (rc, stdout, stderr) tuple.
        """

        ssh = SSH()
        ssh.connect(node)

        remote_file_path = '{0}/{1}/{2}'.format(Constants.REMOTE_FW_DIR,
                                                Constants.RESOURCES_TPL_VAT,
                                                vat_name)
        # TODO this overwrites the output if the vat script has been used twice
        remote_file_out = remote_file_path + ".out"

        cmd = "sudo -S {vat} {json} < {input}".format(
            vat=Constants.VAT_BIN_NAME,
            json="json" if json_out is True else "",
            input=remote_file_path)
        (ret_code, stdout, stderr) = ssh.exec_command(cmd, timeout)
        self._ret_code = ret_code
        self._stdout = stdout
        self._stderr = stderr

        logger.trace("Command '{0}' returned {1}'".format(cmd, self._ret_code))
        logger.trace("stdout: '{0}'".format(self._stdout))
        logger.trace("stderr: '{0}'".format(self._stderr))

        # TODO: download vpp_api_test output file
        # self._delete_files(node, remote_file_path, remote_file_out)

    def execute_script_json_out(self, vat_name, node, timeout=10):
        self.execute_script(vat_name, node, timeout, json_out=True)
        self._stdout = cleanup_vat_json_output(self._stdout)

    @staticmethod
    def _delete_files(node, *files):
        ssh = SSH()
        ssh.connect(node)
        files = " ".join([str(x) for x in files])
        ssh.exec_command("rm {0}".format(files))

    def script_should_have_failed(self):
        if self._ret_code is None:
            raise Exception("First execute the script!")
        if self._ret_code == 0:
            raise AssertionError(
                "Script execution passed, but failure was expected")

    def script_should_have_passed(self):
        if self._ret_code is None:
            raise Exception("First execute the script!")
        if self._ret_code != 0:
            raise AssertionError(
                "Script execution failed, but success was expected")

    def get_script_stdout(self):
        return self._stdout

    def get_script_stderr(self):
        return self._stderr

    @staticmethod
    def cmd_from_template(node, vat_template_file, **vat_args):
        """Execute VAT script on specified node. This method supports
         script templates with parameters
        :param node: node in topology on witch the script is executed
        :param vat_template_file: template file of VAT script
        :param vat_args: arguments to the template file
        :return: list of json objects returned by VAT
        """
        with VatTerminal(node) as vat:
            return vat.vat_terminal_exec_cmd_from_template(vat_template_file,
                                                           **vat_args)

    @staticmethod
    def copy_config_to_remote(node, local_path, remote_path):
        # TODO: will be removed once v4 is merged to master.
        """Copies vat configuration file to node

        :param node: Remote node on which to copy the VAT configuration file
        :param local_path: path of the VAT script on local device that launches
        test cases.
        :param remote_path: path on remote node where to copy the VAT
        configuration script file
        """
        ssh = SSH()
        ssh.connect(node)
        logger.trace("Removing old file {}".format(remote_path))
        ssh.exec_command_sudo("rm -f {}".format(remote_path))
        ssh.scp(local_path, remote_path)


class VatTerminal(object):
    """VAT interactive terminal

       :param node: Node to open VAT terminal on.
    """

    __VAT_PROMPT = "vat# "
    __LINUX_PROMPT = ":~$ "

    def __init__(self, node):
        self._ssh = SSH()
        self._ssh.connect(node)
        self._tty = self._ssh.interactive_terminal_open()
        self._ssh.interactive_terminal_exec_command(
            self._tty,
            'sudo -S {vat} json'.format(vat=Constants.VAT_BIN_NAME),
            self.__VAT_PROMPT)

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.vat_terminal_close()

    def vat_terminal_exec_cmd(self, cmd):
        """Execute command on the opened VAT terminal.

           :param cmd: Command to be executed.

           :return: Command output in python representation of JSON format.
        """
        logger.debug("Executing command in VAT terminal: {}".format(cmd))
        out = self._ssh.interactive_terminal_exec_command(self._tty,
                                                          cmd,
                                                          self.__VAT_PROMPT)
        logger.debug("VAT output: {}".format(out))
        json_out = json.loads(out)
        return json_out

    def vat_terminal_close(self):
        """Close VAT terminal."""
        self._ssh.interactive_terminal_exec_command(self._tty,
                                                    'quit',
                                                    self.__LINUX_PROMPT)
        self._ssh.interactive_terminal_close(self._tty)

    def vat_terminal_exec_cmd_from_template(self, vat_template_file, **args):
        """Execute VAT script from a file.
        :param vat_template_file: template file name of a VAT script
        :param args: dictionary of parameters for VAT script
        :return: list of json objects returned by VAT
        """
        file_path = '{}/{}'.format(Constants.RESOURCES_TPL_VAT,
                                   vat_template_file)
        with open(file_path, 'r') as template_file:
            cmd_template = template_file.readlines()
        ret = []
        for line_tmpl in cmd_template:
            vat_cmd = line_tmpl.format(**args)
            ret.append(self.vat_terminal_exec_cmd(vat_cmd.replace('\n', '')))
        return ret