Make system health service start early (#9792)

- Why I did it
For SYSTEM READY feature. Currently, there is a booting stage in system health service to indicate that the system is loading SONiC component. This booting stage is no longer needed because SYSTEM READY feature will treat that stage as system "NOT READY".

- How I did it
1. Remove booting stage
2. Adjust unit test cases

- How to verify it
Manual test, Unit test, sonic-mgmt Regression

src/system-health/health_checker/manager.py

@@ -1,4 +1,3 @@
-from . import utils
 from .config import Config
 from .health_checker import HealthChecker
 from .service_checker import ServiceChecker
@@ -10,14 +9,10 @@ class HealthCheckerManager(object):
     """
     Manage all system health checkers and system health configuration.
     """
-    STATE_BOOTING = 'booting'
-    STATE_RUNNING = 'running'
     boot_timeout = None
 
     def __init__(self):
         self._checkers = []
-        self._state = self.STATE_BOOTING
-
         self.config = Config()
         self.initialize()
 
@@ -33,17 +28,11 @@ def check(self, chassis):
         """
         Load new configuration if any and perform the system health check for all existing checkers.
         :param chassis: A chassis object.
-        :return: A tuple. The first element indicate the status of the checker; the second element is a dictionary that
-        contains the status for all objects that was checked.
+        :return: A dictionary that contains the status for all objects that was checked.
         """
         HealthChecker.summary = HealthChecker.STATUS_OK
         stats = {}
         self.config.load_config()
-        # check state first to avoid user change boot timeout in configuration file
-        # after finishing system boot
-        if self._state == self.STATE_BOOTING and self._is_system_booting():
-            self._set_system_led(chassis, self.config, 'booting')
-            return self._state, stats
 
         for checker in self._checkers:
             self._do_check(checker, stats)
@@ -56,7 +45,7 @@ def check(self, chassis):
         led_status = 'normal' if HealthChecker.summary == HealthChecker.STATUS_OK else 'fault'
         self._set_system_led(chassis, self.config, led_status)
 
-        return self._state, stats
+        return stats
 
     def _do_check(self, checker, stats):
         """
@@ -86,15 +75,6 @@ def _do_check(self, checker, stats):
             else:
                 stats['Internal'].update(entry)
 
-    def _is_system_booting(self):
-        uptime = utils.get_uptime()
-        if not self.boot_timeout:
-            self.boot_timeout = self.config.get_bootup_timeout()
-        booting = uptime < self.boot_timeout
-        if not booting:
-            self._state = self.STATE_RUNNING
-        return booting
-
     def _set_system_led(self, chassis, config, status):
         try:
             chassis.set_status_led(config.get_led_color(status))

src/system-health/health_checker/service_checker.py

@@ -218,7 +218,7 @@ def check_by_monit(self, config):
         output = utils.run_command(ServiceChecker.CHECK_CMD)
         lines = output.splitlines()
         if not lines or len(lines) < ServiceChecker.MIN_CHECK_CMD_LINES:
-            self.set_object_not_ok('Service', 'monit', 'output of \"monit summary -B\" is invalid or incompatible')
+            self.set_object_not_ok('Service', 'monit', 'monit service is not ready')
             return
 
         status_begin = lines[1].find('Status')

src/system-health/health_checker/utils.py

@@ -8,7 +8,7 @@ def run_command(command):
     :return: Output of the shell command.
     """
     try:
-        process = subprocess.Popen(command, shell=True, universal_newlines=True, stdout=subprocess.PIPE)
+        process = subprocess.Popen(command, shell=True, universal_newlines=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
         return process.communicate()[0]
     except Exception:
         return None

src/system-health/scripts/healthd

@@ -18,7 +18,7 @@ SYSLOG_IDENTIFIER = 'healthd'
 
 class HealthDaemon(DaemonBase):
     """
-    A daemon that run as a service to perform system health checker with a configurable interval. Also set system LED 
+    A daemon that run as a service to perform system health checker with a configurable interval. Also set system LED
     according to the check result and store the check result to redis.
     """
     SYSTEM_HEALTH_TABLE_NAME = 'SYSTEM_HEALTH_INFO'
@@ -35,7 +35,7 @@ class HealthDaemon(DaemonBase):
     def deinit(self):
         """
         Destructor. Remove all entries in $SYSTEM_HEALTH_TABLE_NAME table.
-        :return: 
+        :return:
         """
         self._clear_system_health_table()
 
@@ -64,7 +64,7 @@ class HealthDaemon(DaemonBase):
     def run(self):
         """
         Check system health in an infinite loop.
-        :return: 
+        :return:
         """
         self.log_notice("Starting up...")
 
@@ -76,9 +76,8 @@ class HealthDaemon(DaemonBase):
                 self.log_warning("System health configuration file not found, exit...")
                 return
             while 1:
-                state, stat = manager.check(chassis)
-                if state == HealthCheckerManager.STATE_RUNNING:
-                    self._process_stat(chassis, manager.config, stat)
+                stat = manager.check(chassis)
+                self._process_stat(chassis, manager.config, stat)
 
                 if self.stop_event.wait(manager.config.interval):
                     break

src/system-health/tests/test_system_health.py

@@ -439,26 +439,14 @@ def test_config():
 @patch('health_checker.user_defined_checker.UserDefinedChecker.get_info')
 @patch('health_checker.service_checker.ServiceChecker.get_info')
 @patch('health_checker.hardware_checker.HardwareChecker.get_info')
-@patch('health_checker.utils.get_uptime')
-def test_manager(mock_uptime, mock_hw_info, mock_service_info, mock_udc_info):
+def test_manager(mock_hw_info, mock_service_info, mock_udc_info):
     chassis = MagicMock()
     chassis.set_status_led = MagicMock()
 
     manager = HealthCheckerManager()
     manager.config.user_defined_checkers = ['some check']
-    assert manager._state == HealthCheckerManager.STATE_BOOTING
     assert len(manager._checkers) == 2
 
-    mock_uptime.return_value = 200
-    assert manager._is_system_booting()
-    state, stat = manager.check(chassis)
-    assert state == HealthCheckerManager.STATE_BOOTING
-    assert len(stat) == 0
-    chassis.set_status_led.assert_called_with('orange_blink')
-
-    mock_uptime.return_value = 500
-    assert not manager._is_system_booting()
-    assert manager._state == HealthCheckerManager.STATE_RUNNING
     mock_hw_info.return_value = {
         'ASIC': {
             'type': 'ASIC',
@@ -485,8 +473,7 @@ def test_manager(mock_uptime, mock_hw_info, mock_service_info, mock_udc_info):
             'status': 'OK'
         }
     }
-    state, stat = manager.check(chassis)
-    assert state == HealthCheckerManager.STATE_RUNNING
+    stat = manager.check(chassis)
     assert 'Services' in stat
     assert stat['Services']['snmp:snmpd']['status'] == 'OK'
 
@@ -500,7 +487,7 @@ def test_manager(mock_uptime, mock_hw_info, mock_service_info, mock_udc_info):
     mock_hw_info.side_effect = RuntimeError()
     mock_service_info.side_effect = RuntimeError()
     mock_udc_info.side_effect = RuntimeError()
-    state, stat = manager.check(chassis)
+    stat = manager.check(chassis)
     assert 'Internal' in stat
     assert stat['Internal']['ServiceChecker']['status'] == 'Not OK'
     assert stat['Internal']['HardwareChecker']['status'] == 'Not OK'
@@ -518,6 +505,3 @@ def test_utils():
 
     output = utils.run_command('ls')
     assert output
-
-    uptime = utils.get_uptime()
-    assert uptime > 0