PSUd changes to compute power-budget for Modular chassis (sonic-net#104)

PSUd changes to computer power-budget for Modular chassis

HLD: sonic-net/SONiC#646

PSUd will introduce power requirements calculations. Platform APIs are introduced to provide consumers and total consumed power. Number of PSUs will help provide total supplied power

**Output of STATE-DB:**
```
  "CHASSIS_INFO|chassis_power_budget 1": {
    "expireat": 1603182970.639244,
    "ttl": -0.001,
    "type": "hash",
    "value": {
      "SUPERVISOR consumed_power": "80.0",
      "FABRIC-CARD consumed_power": "185.0",
      "FAN consumed_power": "999",
      "LINE-CARD consumed_power": "1000.0",
      "PSU supplied_power": "9000.0"
    }
  },
```

.gitignore

@@ -11,8 +11,9 @@
 # Compiled code which doesn't end in '.pyc'
 sonic-thermalctld/scripts/thermalctldc
 sonic-chassisd/scripts/chassisdc
+sonic-psud/scripts/psudc
 
 # Unit test / coverage reports
 coverage.xml
 .coverage
-htmlcov/
+htmlcov/

sonic-psud/pytest.ini

@@ -0,0 +1,2 @@
+[pytest]
+addopts = --cov=scripts --cov-report html --cov-report term --cov-report xml

sonic-psud/scripts/psud

@@ -14,11 +14,21 @@ try:
     import sys
     import threading
 
-    from sonic_py_common import daemon_base
-    from swsscommon import swsscommon
+    from sonic_py_common import daemon_base, logger
+
 except ImportError as e:
     raise ImportError (str(e) + " - required module not found")
 
+try:
+    from swsscommon import swsscommon
+except ImportError as e:
+    from tests import mock_swsscommon as swsscommon
+
+try:
+    from sonic_platform_base.device_base import DeviceBase
+except ImportError as e:
+    from tests.mock_device_base import DeviceBase
+
 #
 # Constants ====================================================================
 #
@@ -32,6 +42,12 @@ CHASSIS_INFO_TABLE = 'CHASSIS_INFO'
 CHASSIS_INFO_KEY_TEMPLATE = 'chassis {}'
 CHASSIS_INFO_PSU_NUM_FIELD = 'psu_num'
 
+CHASSIS_INFO_POWER_CONSUMER_FIELD = 'Consumed Power {}'
+CHASSIS_INFO_POWER_SUPPLIER_FIELD = 'Supplied Power {}'
+CHASSIS_INFO_TOTAL_POWER_CONSUMED_FIELD = 'Total Consumed Power'
+CHASSIS_INFO_TOTAL_POWER_SUPPLIED_FIELD = 'Total Supplied Power'
+CHASSIS_INFO_POWER_KEY_TEMPLATE = 'chassis_power_budget {}'
+
 PSU_INFO_TABLE = 'PSU_INFO'
 PSU_INFO_KEY_TEMPLATE = 'PSU {}'
 PSU_INFO_PRESENCE_FIELD = 'presence'
@@ -133,8 +149,111 @@ def log_on_status_changed(logger, normal_status, normal_log, abnormal_log):
     else:
         logger.log_warning(abnormal_log)
 
-
 #
+# PSU Chassis Info ==========================================================
+#
+class PsuChassisInfo(logger.Logger):
+
+    def __init__(self, log_identifier, chassis):
+        """
+        Constructor for PsuChassisInfo
+        :param chassis: Object representing a platform chassis
+        """
+        super(PsuChassisInfo, self).__init__(log_identifier)
+
+        self.chassis = chassis
+        self.master_status_good = True
+        self.total_consumed_power = 0.0
+        self.total_supplied_power = 0.0
+
+    def run_power_budget(self, chassis_tbl):
+        self.total_supplied_power = 0.0
+        self.total_consumed_power = 0.0
+        total_supplied_power = 0.0
+        total_fan_consumed_power = 0.0
+        total_module_consumed_power = 0.0
+
+        dict_index = 0
+        total_entries_len = 2 #For total supplied and consumed
+        dict_len = self.chassis.get_num_psus() +\
+                   self.chassis.get_num_fan_drawers() +\
+                   self.chassis.get_num_modules() + \
+                   total_entries_len
+
+        fvs = swsscommon.FieldValuePairs(dict_len)
+
+        for index, psu in enumerate(self.chassis.get_all_psus()):
+            presence = try_get(psu.get_presence)
+            if not presence:
+                continue
+
+            power_good = try_get(psu.get_powergood_status)
+            if not power_good:
+                continue
+
+            name = try_get(psu.get_name, 'PSU {}'.format(index + 1))
+            supplied_power = try_get(psu.get_maximum_supplied_power, 0.0)
+            total_supplied_power = total_supplied_power + supplied_power
+            fvs[dict_index] = (CHASSIS_INFO_POWER_SUPPLIER_FIELD.format(name), str(supplied_power))
+            dict_index += 1
+
+        for index, power_consumer in enumerate(self.chassis.get_all_fan_drawers()):
+            presence = try_get(power_consumer.get_presence)
+            if not presence:
+                continue
+
+            name = try_get(power_consumer.get_name, 'FAN-DRAWER {}'.format(index))
+            fan_drawer_power = try_get(power_consumer.get_maximum_consumed_power, 0.0)
+            total_fan_consumed_power = total_fan_consumed_power + fan_drawer_power
+            fvs[dict_index] = (CHASSIS_INFO_POWER_CONSUMER_FIELD.format(name), str(fan_drawer_power))
+            dict_index += 1
+
+        for index, power_consumer in enumerate(self.chassis.get_all_modules()):
+            presence = try_get(power_consumer.get_presence)
+            if not presence:
+                continue
+
+            name = try_get(power_consumer.get_name, 'MODULE {}'.format(index))
+            module_power = try_get(power_consumer.get_maximum_consumed_power, 0.0)
+            total_module_consumed_power = total_module_consumed_power + module_power
+            fvs[dict_index] = (CHASSIS_INFO_POWER_CONSUMER_FIELD.format(name), str(module_power))
+            dict_index += 1
+
+        #Record total supplied and consumed power
+        self.total_supplied_power = total_supplied_power
+        self.total_consumed_power = total_fan_consumed_power + total_module_consumed_power
+
+        #Record in state DB in chassis table
+        fvs[dict_index] = (CHASSIS_INFO_TOTAL_POWER_SUPPLIED_FIELD, str(self.total_supplied_power))
+        fvs[dict_index + 1] = (CHASSIS_INFO_TOTAL_POWER_CONSUMED_FIELD, str(self.total_consumed_power))
+        chassis_tbl.set(CHASSIS_INFO_POWER_KEY_TEMPLATE.format(1), fvs)
+
+    def update_master_status(self):
+        if not self.total_supplied_power or not self.total_consumed_power:
+            if self.master_status_good is not True:
+                self.master_status_good = True
+            return False
+
+        master_status_good = (self.total_consumed_power < self.total_supplied_power)
+        if master_status_good == self.master_status_good:
+            return False
+
+        self.master_status_good = master_status_good
+
+        return True
+
+    def _set_psu_master_led(self, master_status):
+        try:
+            try:
+                from sonic_platform.psu import Psu
+            except ImportError as e:
+                from tests.mock_platform import MockPsu as Psu
+
+            color = DeviceBase.STATUS_LED_COLOR_GREEN if master_status else DeviceBase.STATUS_LED_COLOR_RED
+            Psu.set_status_master_led(color)
+        except NotImplementedError as e:
+            pass
+
 # PSU status ===================================================================
 #
 
@@ -216,6 +335,7 @@ class DaemonPsud(daemon_base.DaemonBase):
         self.stop = threading.Event()
         self.psu_status_dict = {}
         self.fan_tbl = None
+        self.psu_chassis_info = None
 
     # Signal handler
     def signal_handler(self, sig, frame):
@@ -263,6 +383,7 @@ class DaemonPsud(daemon_base.DaemonBase):
         fvs = swsscommon.FieldValuePairs([(CHASSIS_INFO_PSU_NUM_FIELD, str(psu_num))])
         chassis_tbl.set(CHASSIS_INFO_KEY_TEMPLATE.format(1), fvs)
 
+
         # Start main loop
         self.log_info("Start daemon main loop")
 
@@ -271,13 +392,18 @@ class DaemonPsud(daemon_base.DaemonBase):
             self.update_psu_data(psu_tbl)
             self._update_led_color(psu_tbl)
 
+            if platform_chassis is not None and platform_chassis.is_modular_chassis():
+                self.update_psu_chassis_info(chassis_tbl)
+                self.update_master_led_color(chassis_tbl)
+
         self.log_info("Stop daemon main loop")
 
         # Delete all the information from DB and then exit
         for psu_index in range(1, psu_num + 1):
             psu_tbl._del(PSU_INFO_KEY_TEMPLATE.format(psu_index))
 
         chassis_tbl._del(CHASSIS_INFO_KEY_TEMPLATE.format(1))
+        chassis_tbl._del(CHASSIS_INFO_POWER_KEY_TEMPLATE.format(1))
 
         self.log_info("Shutting down...")
 
@@ -427,6 +553,28 @@ class DaemonPsud(daemon_base.DaemonBase):
                 ])
             self.fan_tbl.set(fan_name, fvs)
 
+    def update_psu_chassis_info(self, chassis_tbl):
+        if not platform_chassis:
+            return
+
+        if not self.psu_chassis_info:
+            self.psu_chassis_info = PsuChassisInfo(SYSLOG_IDENTIFIER, platform_chassis)
+
+        self.psu_chassis_info.run_power_budget(chassis_tbl)
+
+    def update_master_led_color(self, chassis_tbl):
+        if not platform_chassis or not self.psu_chassis_info:
+            return
+
+        psu_chassis_info = self.psu_chassis_info
+        if psu_chassis_info.update_master_status():
+            log_on_status_changed(self, psu_chassis_info.master_status_good,
+                                  'PSU supplied power warning cleared: supplied power is back to normal.',
+                                  'PSU supplied power warning: {}W supplied-power less than {}W consumed-power'.format(
+                                      psu_chassis_info.total_supplied_power, psu_chassis_info.total_consumed_power)
+                                  )
+            psu_chassis_info._set_psu_master_led(psu_chassis_info.master_status_good)
+
 
 #
 # Main =========================================================================

sonic-psud/setup.cfg

@@ -0,0 +1,2 @@
+[aliases]
+test=pytest

sonic-psud/setup.py

@@ -10,12 +10,21 @@
     url='https://github.com/Azure/sonic-platform-daemons',
     maintainer='Kevin Wang',
     maintainer_email='kevinw@mellanox.com',
+    packages=[
+        'tests'
+    ],
     scripts=[
         'scripts/psud',
     ],
     setup_requires= [
+        'pytest-runner',
         'wheel'
     ],
+    tests_require = [
+        'pytest',
+        'mock>=2.0.0',
+        'pytest-cov'
+    ],
     classifiers=[
         'Development Status :: 4 - Beta',
         'Environment :: No Input/Output (Daemon)',
@@ -29,4 +38,5 @@
         'Topic :: System :: Hardware',
     ],
     keywords='sonic SONiC psu PSU daemon psud PSUD',
+    test_suite='setup.get_test_suite'
 )

sonic-psud/tests/mock_device_base.py

@@ -0,0 +1,11 @@
+class DeviceBase():
+    #Device-types
+    DEVICE_TYPE_PSU     = "PSU"
+    DEVICE_TYPE_FAN     = "FAN"
+    DEVICE_TYPE_FANDRAWER = "FAN-DRAWER"
+
+    #LED colors
+    STATUS_LED_COLOR_GREEN = "green"
+    STATUS_LED_COLOR_AMBER = "amber"
+    STATUS_LED_COLOR_RED = "red"
+    STATUS_LED_COLOR_OFF = "off"

sonic-psud/tests/mock_platform.py

@@ -0,0 +1,116 @@
+from .mock_device_base import DeviceBase
+
+class MockDevice:
+    def __init__(self):
+        self.name = None
+        self.presence = True
+        self.model = 'Module Model'
+        self.serial = 'Module Serial'
+
+    def get_name(self):
+        return self.name
+
+    def set_presence(self, presence):
+        self.presence = presence
+
+    def get_presence(self):
+        return self.presence
+
+    def get_model(self):
+        return self.model
+
+    def get_serial(self):
+        return self.serial
+
+class MockPsu(MockDevice):
+
+    psu_master_led_color = DeviceBase.STATUS_LED_COLOR_OFF
+
+    def __init__(self, psu_presence, psu_status, psu_name):
+        self.name = psu_name
+        self.presence = True
+        self.psu_status = psu_status
+
+    def get_powergood_status(self):
+        return self.psu_status
+
+    def set_status(self, status):
+        self.psu_status = status
+
+    def set_maximum_supplied_power(self, supplied_power):
+        self.max_supplied_power = supplied_power
+
+    def get_maximum_supplied_power(self):
+        return self.max_supplied_power
+
+    @classmethod
+    def set_status_master_led(cls, color):
+        cls.psu_master_led_color = color
+
+    @classmethod
+    def get_status_master_led(cls):
+        return cls.psu_master_led_color
+
+class MockFanDrawer(MockDevice):
+    def __init__(self, fan_drawer_presence, fan_drawer_status, fan_drawer_name):
+        self.name = fan_drawer_name
+        self.presence = True
+        self.fan_drawer_status = fan_drawer_status
+
+    def get_status(self):
+        return self.fan_drawer_status
+
+    def set_status(self, status):
+        self.fan_drawer_status = status
+
+    def set_maximum_consumed_power(self, consumed_power):
+        self.max_consumed_power = consumed_power
+
+    def get_maximum_consumed_power(self):
+        return self.max_consumed_power
+
+class MockModule(MockDevice):
+    def __init__(self, module_presence, module_status, module_name):
+        self.name = module_name
+        self.presence = True
+        self.module_status = module_status
+
+    def get_status(self):
+        return self.module_status
+
+    def set_status(self, status):
+        self.module_status = status
+
+    def set_maximum_consumed_power(self, consumed_power):
+        self.max_consumed_power = consumed_power
+
+    def get_maximum_consumed_power(self):
+        return self.max_consumed_power
+
+class MockChassis:
+
+    def __init__(self):
+        self.psu_list = []
+        self.fan_drawer_list = []
+        self.module_list = []
+
+    def get_num_psus(self):
+        return len(self.psu_list)
+
+    def get_all_psus(self):
+        return self.psu_list
+
+    def get_psu(self, index):
+        return self.psu_list[index]
+
+    def get_num_fan_drawers(self):
+        return len(self.fan_drawer_list)
+
+    def get_all_fan_drawers(self):
+        return self.fan_drawer_list
+
+    def get_num_modules(self):
+        return len(self.module_list)
+
+    def get_all_modules(self):
+        return self.module_list