Remove support for older psutil versions

Global requirements was recently updated to force psutil=>3.0.1. This
patch removes support for older versions of psutil as well as changing
to opportunistically attempt to work if a version >5 is released but
doesn't change the interface we use.

Change-Id: I1f7fab33fd275fb8b5cd7704dc13375402756d06
Related-bug: #1659137

2 files changed, 27 insertions, 20 deletions

diff --git a/ironic_python_agent/hardware.py b/ironic_python_agent/hardware.py
index 7fd4ee5a..68d738f0 100644
--- a/ironic_python_agent/hardware.py
+++ b/ironic_python_agent/hardware.py
@@ -594,16 +594,12 @@ class GenericHardwareManager(HardwareManager):
 
     def get_memory(self):
         # psutil returns a long, so we force it to an int
-        if psutil.version_info[0] == 1:
-            total = int(psutil.TOTAL_PHYMEM)
-        elif psutil.version_info[0] == 2:
-            total = int(psutil.phymem_usage().total)
-        elif psutil.version_info[0] == 5:
+        try:
             total = int(psutil.virtual_memory().total)
-        else:
+        except Exception:
             total = None
-            LOG.warning("Cannot fetch total memory size: unsupported psutil "
-                        "version %s", psutil.version_info[0])
+            LOG.exception(("Cannot fetch total memory size using psutil "
+                           "version %s"), psutil.version_info[0])
 
         try:
             out, _e = utils.execute("dmidecode --type 17 | grep Size",
diff --git a/ironic_python_agent/tests/unit/test_hardware.py b/ironic_python_agent/tests/unit/test_hardware.py
index db87b5f3..e7b8ed4c 100644
--- a/ironic_python_agent/tests/unit/test_hardware.py
+++ b/ironic_python_agent/tests/unit/test_hardware.py
@@ -239,6 +239,15 @@ CPUINFO_FLAGS_OUTPUT = """
 flags           : fpu vme de pse
 """
 
+DMIDECODE_MEMORY_OUTPUT = ("""
+Foo
+Size: 2048 MB
+Size: 2 GB
+Installed Size: Not Installed
+Enabled Size: Not Installed
+Size: No Module Installed
+""", "")
+
 
 class FakeHardwareManager(hardware.GenericHardwareManager):
     def __init__(self, hardware_support):
@@ -728,24 +737,26 @@ class TestGenericHardwareManager(test_base.BaseTestCase):
         self.assertEqual('x86_64', cpus.architecture)
         self.assertEqual([], cpus.flags)
 
-    @mock.patch('psutil.version_info', (5, 0))
     @mock.patch('psutil.virtual_memory', autospec=True)
-    @mock.patch.object(utils, 'execute')
-    def test_get_memory(self, mocked_execute, mocked_virtmem):
-        mocked_virtmem.return_value.total = 3952 * 1024 * 1024
-        mocked_execute.return_value = (
-            ("Foo\nSize: 2048 MB\nSize: 2 GB\n"
-             "Installed Size: Not Installed\n"
-             "Enabled Size: Not Installed\n"
-             "Size: No Module Installed\n"),
-            ""
-        )
-
+    @mock.patch.object(utils, 'execute', autospec=True)
+    def test_get_memory_psutil(self, mocked_execute, mocked_psutil):
+        mocked_psutil.return_value.total = 3952 * 1024 * 1024
+        mocked_execute.return_value = DMIDECODE_MEMORY_OUTPUT
         mem = self.hardware.get_memory()
 
         self.assertEqual(3952 * 1024 * 1024, mem.total)
         self.assertEqual(4096, mem.physical_mb)
 
+    @mock.patch('psutil.virtual_memory', autospec=True)
+    @mock.patch.object(utils, 'execute', autospec=True)
+    def test_get_memory_psutil_exception(self, mocked_execute, mocked_psutil):
+        mocked_execute.return_value = DMIDECODE_MEMORY_OUTPUT
+        mocked_psutil.side_effect = AttributeError()
+        mem = self.hardware.get_memory()
+
+        self.assertIsNone(mem.total)
+        self.assertEqual(4096, mem.physical_mb)
+
     def test_list_hardware_info(self):
         self.hardware.list_network_interfaces = mock.Mock()
         self.hardware.list_network_interfaces.return_value = [