Fix/#56 (#57)

* Fix - #56: Force CPU frequency to 0 when unable to fetch it.

On some system, it appears to not be feasible to fetch the frequency.
Under such circumstances, the CPU frequency is set to 0 and a warning
is emited.

docs/sources/changelog.rst

@@ -2,6 +2,10 @@
 Changelog
 =========
 
+* :release:`1.6.4 <2022-05-18>`
+* :bug:`#56` Force the CPU frequency to 0 and emit a warning when unable to fetch it from the system.
+* :bug:`#54` Fix a bug that crashes the monitor upon non ASCII characters in commit log under Perforce. Improved P4 change number extraction.
+
 * :release:`1.6.3 <2021-12-22>`
 * :bug:`#50` Fix a bug where a skipping fixture resulted in an exception during teardown.
 

docs/sources/operating.rst

@@ -58,7 +58,7 @@ session. An Execution Context describes much of the machine settings:
 CPU_COUNT (integer)
     Number of online CPUs the machine can use.
 CPU_FREQUENCY_MHZ (integer)
-    Base frequency of the CPUs (in megahertz).
+    Base frequency of the CPUs (in megahertz). Set to 0 if unable to fetch it.
 CPU_VENDOR (TEXT 256 CHAR)
     Full CPU vendor string.
 RAM_TOTAL_MB (INTEGER)

pytest_monitor/sys_utils.py

@@ -6,6 +6,7 @@
 import socket
 import subprocess
 import sys
+import warnings
 
 
 def collect_ci_info():
@@ -67,7 +68,11 @@ class ExecutionContext:
     def __init__(self):
         self.__cpu_count = multiprocessing.cpu_count()
         self.__cpu_vendor = _get_cpu_string()
-        self.__cpu_freq_base = psutil.cpu_freq().current
+        try:
+            self.__cpu_freq_base = psutil.cpu_freq().current
+        except AttributeError:
+            warnings.warn("Unable to fetch CPU frequency. Forcing it to 0.")
+            self.__cpu_freq_base = 0
         self.__proc_typ = platform.processor()
         self.__tot_mem = int(psutil.virtual_memory().total / 1024**2)
         self.__fqdn = socket.getfqdn()

tests/test_monitor_context.py

@@ -0,0 +1,42 @@
+import mock
+import pathlib
+import sqlite3
+
+
+@mock.patch('pytest_monitor.sys_utils.psutil.cpu_freq', return_value=None)
+def test_when_cpu_freq_cannot_fetch_frequency(cpu_freq_mock, testdir):
+    """Make sure that pytest-monitor does the job when we have issue in collecing context resources"""
+    # create a temporary pytest test module
+    testdir.makepyfile("""
+    import time
+
+
+    def test_ok():
+        time.sleep(0.5)
+        x = ['a' * i for i in range(100)]
+        assert len(x) == 100
+
+""")
+
+    # run pytest with the following cmd args
+    result = testdir.runpytest('-vv')
+
+    # fnmatch_lines does an assertion internally
+    result.stdout.fnmatch_lines(['*::test_ok PASSED*'])
+
+    pymon_path = pathlib.Path(str(testdir)) / '.pymon'
+    assert pymon_path.exists()
+
+    # make sure that that we get a '0' exit code for the test suite
+    result.assert_outcomes(passed=1)
+
+    db = sqlite3.connect(str(pymon_path))
+    cursor = db.cursor()
+    cursor.execute('SELECT ITEM FROM TEST_METRICS;')
+    assert 1 == len(cursor.fetchall())  # current test
+    cursor = db.cursor()
+    cursor.execute('SELECT CPU_FREQUENCY_MHZ FROM EXECUTION_CONTEXTS;')
+    rows = cursor.fetchall()
+    assert 1 == len(rows)
+    assert rows[0][0] == 0
+