Add SSD Health API and generic implementation (sonic-net#47)

* Add SSD Health API and generic implementation

Signed-off-by: Andriy Moroz <c_andriym@mellanox.com>

setup.py

@@ -16,6 +16,7 @@
         'sonic_platform_base',
         'sonic_platform_base.sonic_eeprom',
         'sonic_platform_base.sonic_sfp',
+        'sonic_platform_base.sonic_ssd',
         'sonic_psu',
         'sonic_sfp',
     ],

sonic_platform_base/sonic_ssd/ssd_base.py

@@ -0,0 +1,75 @@
+#
+# ssd_base.py
+#
+# Base class for implementing common SSD health features
+#
+
+
+class SsdBase(object):
+    """
+    Base class for interfacing with a SSD
+    """
+    def __init__(self, diskdev):
+        """
+        Constructor
+
+        Args:
+            diskdev: Linux device name to get parameters for
+        """
+        pass
+
+    def get_health(self):
+        """
+        Retrieves current disk health in percentages
+
+        Returns:
+            A float number of current ssd health
+            e.g. 83.5
+        """
+        raise NotImplementedError
+
+    def get_temperature(self):
+        """
+        Retrieves current disk temperature in Celsius
+
+        Returns:
+            A float number of current temperature in Celsius
+            e.g. 40.1
+        """
+        raise NotImplementedError
+
+    def get_model(self):
+        """
+        Retrieves model for the given disk device
+
+        Returns:
+            A string holding disk model as provided by the manufacturer
+        """
+        raise NotImplementedError
+
+    def get_firmware(self):
+        """
+        Retrieves firmware version for the given disk device
+
+        Returns:
+            A string holding disk firmware version as provided by the manufacturer
+        """
+        raise NotImplementedError
+
+    def get_serial(self):
+        """
+        Retrieves serial number for the given disk device
+
+        Returns:
+            A string holding disk serial number as provided by the manufacturer
+        """
+        raise NotImplementedError
+
+    def get_vendor_output(self):
+        """
+        Retrieves vendor specific data for the given disk device
+
+        Returns:
+            A string holding some vendor specific disk information
+        """
+        raise NotImplementedError

sonic_platform_base/sonic_ssd/ssd_generic.py

@@ -0,0 +1,157 @@
+#
+# ssd_generic.py
+#
+# Generic implementation of the SSD health API
+# SSD models supported:
+#  - InnoDisk
+#  - StorFly
+#  - Virtium
+
+try:
+    import exceptions              # Python 2
+except ImportError:
+    import builtins as exceptions  # Python 3
+try:
+    import re
+    import subprocess
+    from .ssd_base import SsdBase
+except ImportError as e:
+    raise ImportError (str(e) + "- required module not found")
+
+SMARTCTL = "smartctl {} -a"
+INNODISK = "iSmart -d {}"
+VIRTIUM  = "SmartCmd -m {}"
+
+NOT_AVAILABLE = "N/A"
+
+
+class SsdUtil(SsdBase):
+    """
+    Generic implementation of the SSD health API
+    """
+    model = NOT_AVAILABLE
+    serial = NOT_AVAILABLE
+    firmware = NOT_AVAILABLE
+    temperature = NOT_AVAILABLE
+    health = NOT_AVAILABLE
+    ssd_info = NOT_AVAILABLE
+    vendor_ssd_info = NOT_AVAILABLE
+
+    def __init__(self, diskdev):
+        self.vendor_ssd_utility = {
+            "Generic"  : { "utility" : SMARTCTL, "parser" : self.parse_generic_ssd_info },
+            "InnoDisk" : { "utility" : INNODISK, "parser" : self.parse_innodisk_info },
+            "M.2"      : { "utility" : INNODISK, "parser" : self.parse_innodisk_info },
+            "StorFly"  : { "utility" : VIRTIUM,  "parser" : self.parse_virtium_info },
+            "Virtium"  : { "utility" : VIRTIUM,  "parser" : self.parse_virtium_info }
+        }
+
+        self.dev = diskdev
+        # Generic part
+        self.fetch_generic_ssd_info(diskdev)
+        self.parse_generic_ssd_info()
+
+        # Known vendor part
+        if self.model:
+            model_short = self.model.split()[0]
+            if self.vendor_ssd_utility.has_key(model_short):
+                self.fetch_vendor_ssd_info(diskdev, model_short)
+                self.parse_vendor_ssd_info(model_short)
+            else:
+                # No handler registered for this disk model
+                pass
+        else:
+            # Failed to get disk model
+            self.model = "Unknown"
+
+    def _execute_shell(self, cmd):
+        process = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
+        output, error = process.communicate()
+        return output
+
+    def _parse_re(self, pattern, buffer):
+        res_list = re.findall(pattern, buffer)
+        return res_list[0] if res_list else NOT_AVAILABLE
+
+    def fetch_generic_ssd_info(self, diskdev):
+        self.ssd_info = self._execute_shell(self.vendor_ssd_utility["Generic"]["utility"].format(diskdev))
+
+    def parse_generic_ssd_info(self):
+        self.model = self._parse_re('Device Model:\s*(.+?)\n', self.ssd_info)
+        self.serial = self._parse_re('Serial Number:\s*(.+?)\n', self.ssd_info)
+        self.firmware = self._parse_re('Firmware Version:\s*(.+?)\n', self.ssd_info)
+
+    def parse_innodisk_info(self):
+        self.health = self._parse_re('Health:\s*(.+?)%', self.vendor_ssd_info)
+        self.temperature = self._parse_re('Temperature\s*\[\s*(.+?)\]', self.vendor_ssd_info)
+
+    def parse_virtium_info(self):
+        self.temperature = self._parse_re('Temperature_Celsius\s*\d*\s*(\d+?)\s+', self.vendor_ssd_info)
+        nand_endurance = self._parse_re('NAND_Endurance\s*\d*\s*(\d+?)\s+', self.vendor_ssd_info)
+        avg_erase_count = self._parse_re('Average_Erase_Count\s*\d*\s*(\d+?)\s+', self.vendor_ssd_info)
+        try:
+            self.health = 100 - (float(avg_erase_count) * 100 / float(nand_endurance))
+        except ValueError:
+            pass
+
+    def fetch_vendor_ssd_info(self, diskdev, model):
+        self.vendor_ssd_info = self._execute_shell(self.vendor_ssd_utility[model]["utility"].format(diskdev))
+
+    def parse_vendor_ssd_info(self, model):
+        self.vendor_ssd_utility[model]["parser"]()
+
+    def get_health(self):
+        """
+        Retrieves current disk health in percentages
+
+        Returns:
+            A float number of current ssd health
+            e.g. 83.5
+        """
+        return self.health
+
+    def get_temperature(self):
+        """
+        Retrieves current disk temperature in Celsius
+
+        Returns:
+            A float number of current temperature in Celsius
+            e.g. 40.1
+        """
+        return self.temperature
+
+    def get_model(self):
+        """
+        Retrieves model for the given disk device
+
+        Returns:
+            A string holding disk model as provided by the manufacturer
+        """
+        return self.model
+
+    def get_firmware(self):
+        """
+        Retrieves firmware version for the given disk device
+
+        Returns:
+            A string holding disk firmware version as provided by the manufacturer
+        """
+        return self.firmware
+
+    def get_serial(self):
+        """
+        Retrieves serial number for the given disk device
+
+        Returns:
+            A string holding disk serial number as provided by the manufacturer
+        """
+        return self.serial
+
+    def get_vendor_output(self):
+        """
+        Retrieves vendor specific data for the given disk device
+
+        Returns:
+            A string holding some vendor specific disk information
+        """
+        return self.vendor_ssd_info