Support: Container Metrics collection and Visualization

A. Collector: Add cAdvisor Collector
   This patch adds supports for Container Metrics
   collection using cAdvisor. The collector:
     1. Pushes metrics to InfluxDB storage
     2. Stores metrics locally in Result Dir
     3. Implements print_results() for metric summary
     4. Is configurable from 05_collector.conf

B. Docker: Grafana Dashboard
   This patch also adds JSON file for Grafana Dashboard for
   Container Metrics

Signed-off-by: Parth Yadav <parth.yadav@ramanujan.du.ac.in>
Change-Id: I7c39d4e1a7a46d3a499a241e618bd0da7eed53a8

1 files changed, 218 insertions, 0 deletions

diff --git a/tools/collectors/cadvisor/cadvisor.py b/tools/collectors/cadvisor/cadvisor.py
new file mode 100644
index 00000000..de48cecd
--- /dev/null
+++ b/tools/collectors/cadvisor/cadvisor.py
@@ -0,0 +1,218 @@
+# Copyright 2020 University Of Delhi.
+#
+# 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.
+
+"""
+Collects container metrics from cAdvisor.
+Sends metrics to influxDB and also stores results locally.
+"""
+
+import subprocess
+import logging
+import os
+from collections import OrderedDict
+
+from tools.collectors.collector import collector
+from tools import tasks
+from conf import settings
+
+
+
+# inherit from collector.Icollector.
+class Cadvisor(collector.ICollector):
+    """A collector of container metrics based on cAdvisor
+
+    It starts cadvisor and collects metrics.
+    """
+
+    def __init__(self, results_dir, test_name):
+        """
+        Initialize collection of statistics
+        """
+        self._logger = logging.getLogger(__name__)
+        self.resultsdir = results_dir
+        self.testname = test_name
+        self._pid = 0
+        self._results = OrderedDict()
+        self._log = os.path.join(results_dir,
+                                 settings.getValue('LOG_FILE_CADVISOR') +
+                                 '_' + test_name + '.log')
+        self._logfile = 0
+
+
+    def start(self):
+        """
+        Starts collection of statistics by cAdvisor and stores them
+        into-
+        1. The file in directory with test results
+        2. InfluxDB result container
+        """
+
+        # CMD options for cAdvisor
+        cmd = ['sudo', '/opt/cadvisor/cadvisor',
+               '-storage_driver='+settings.getValue('CADVISOR_STORAGE_DRIVER'),
+               '-storage_driver_host='+settings.getValue('CADVISOR_STORAGE_HOST'),
+               '-storage_driver_db='+settings.getValue('CADVISOR_DRIVER_DB'),
+               '-housekeeping_interval=0.5s',
+               '-storage_driver_buffer_duration=1s'
+              ]
+
+        self._logfile = open(self._log, 'a')
+
+        self._pid = subprocess.Popen(map(os.path.expanduser, cmd), stdout=self._logfile, bufsize=0)
+        self._logger.info('Starting cAdvisor')
+
+
+
+    def stop(self):
+        """
+        Stops collection of metrics by cAdvisor and stores statistic
+        summary for each monitored container into self._results dictionary
+        """
+        try:
+            subprocess.check_output(["pidof", "cadvisor"])
+            tasks.run_task(['sudo', 'pkill', '--signal', '2', 'cadvisor'],
+                           self._logger, 'Stopping cAdvisor', True)
+        except subprocess.CalledProcessError:
+            self._logger.error('Failed to stop cAdvisor, maybe process does not exist')
+
+
+        self._logfile.close()
+        self._logger.info('cAdvisor log available at %s', self._log)
+
+        containers = settings.getValue('CADVISOR_CONTAINERS')
+        self._results = cadvisor_log_result(self._log, containers)
+
+
+    def get_results(self):
+        """Returns collected statistics.
+        """
+        return self._results
+
+    def print_results(self):
+        """Logs collected statistics.
+        """
+        for cnt in self._results:
+            logging.info("Container: %s", cnt)
+            for (key, value) in self._results[cnt].items():
+
+                postfix = ''
+
+                if key == 'cpu_cumulative_usage':
+                    key = 'CPU_usage'
+                    value = round(float(value) / 1000000000, 4)
+                    postfix = '%'
+
+                if key in ['memory_usage', 'memory_working_set']:
+                    value = round(float(value) / 1024 / 1024, 4)
+                    postfix = 'MB'
+
+                if key in ['rx_bytes', 'tx_bytes']:
+                    value = round(float(value) / 1024 / 1024, 4)
+                    postfix = 'mBps'
+
+                logging.info("         Statistic: %s Value: %s %s",
+                             str(key), str(value), postfix)
+
+
+def cadvisor_log_result(filename, containers):
+    """
+    Processes cAdvisor logfile and returns average results
+
+    :param filename: Name of cadvisor logfile
+    :param containers: List of container names
+
+    :returns: Result as average stats of Containers
+    """
+    result = OrderedDict()
+    previous = OrderedDict()
+    logfile = open(filename, 'r')
+    with logfile:
+        # for every line
+        for _, line in enumerate(logfile):
+            # skip lines having root '/' metrics
+            if line[0:7] == 'cName=/':
+                continue
+
+            # parse line into OrderedDict
+            tmp_res = parse_line(line)
+
+            cnt = tmp_res['cName']
+
+            # skip if cnt is not in container list
+            if cnt not in containers:
+                continue
+
+            # add metrics to result
+            if cnt not in result:
+                result[cnt] = tmp_res
+                previous[cnt] = tmp_res
+                result[cnt]['count'] = 1
+            else:
+                for field in tmp_res:
+
+                    if field in ['rx_errors', 'tx_errors', 'memory_usage', 'memory_working_set']:
+                        val = float(tmp_res[field])
+                    elif field in ['cpu_cumulative_usage', 'rx_bytes', 'tx_bytes']:
+                        val = float(tmp_res[field]) - float(previous[cnt][field])
+                    else:
+                        # discard remaining fields
+                        try:
+                            result[cnt].pop(field)
+                        except KeyError:
+                            continue
+                        continue
+
+                    result[cnt][field] = float(result[cnt][field]) + val
+
+                result[cnt]['count'] += 1
+                previous[cnt] = tmp_res
+
+    # calculate average results for containers
+    result = calculate_average(result)
+    return result
+
+
+def calculate_average(results):
+    """
+    Calculates average for container stats
+    """
+    for cnt in results:
+        for field in results[cnt]:
+            if field != 'count':
+                val = float(results[cnt][field])/results[cnt]['count']
+                results[cnt][field] = '{0:.2f}'.format(val)
+
+        results[cnt].pop('count')
+        #sort results
+        results[cnt] = OrderedDict(sorted(results[cnt].items()))
+
+    return results
+
+
+def parse_line(line):
+    """
+    Reads single line from cAdvisor logfile
+
+    :param line: single line as str
+
+    :returns: OrderedDict of line read
+    """
+    tmp_res = OrderedDict()
+    # split line into array of "key=value" metrics
+    metrics = line.split()
+    for metric in metrics:
+        key, value = metric.split('=')
+        tmp_res[key] = value
+
+    return tmp_res