sysmon/plugins/meminfo.py at main · devlocalhost/sysmon · GitHub

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#!/usr/bin/env python3

"""meminfo plugin for sysmon"""

from util.util import en_open
from util.logger import setup_logger


class Meminfo:
    """
    Meminfo class - get physical and swap memory usage

    Usage:
        call get_data() to get data
            returns dict

    DO:
        NOT CALL print_data(). That function
    is intended to be used by sysmon. (might change in the future...?)
        CALL close_files() when your program ends
        to avoid opened files
    """

    def __init__(self):
        """
        initializing important stuff
        """

        self.logger = setup_logger(__name__)

        self.logger.debug("[init] initializing")

        self.meminfo_file = en_open("/proc/meminfo")
        self.logger.debug("[init] /proc/meminfo")

        self.files_opened = [self.meminfo_file]

    def close_files(self):
        """
        closing the opened files. always call this
        when ending the program
        """

        for file in self.files_opened:
            try:
                self.logger.debug(f"[close_files] {file.name}")
                file.close()

            except:
                pass

    def get_data(self):
        """
        returns a json dict with data
        """

        for file in self.files_opened:
            self.logger.debug(f"[get_data] {file.name}")
            file.seek(0)

        # thanks to https://stackoverflow.com/a/28161352
        meminfo_data = dict(
            (i.split()[0].rstrip(":"), int(i.split()[1]) * 1024)
            for i in self.meminfo_file.readlines()
        )

        phy_memory_total = meminfo_data.get("MemTotal", 0)
        phy_memory_available = meminfo_data.get("MemAvailable", 0)
        phy_memory_free = meminfo_data.get("MemFree", 0)

        phy_memory_raw_cached = meminfo_data.get("Cached", 0)
        phy_memory_sreclaimable = meminfo_data.get("SReclaimable", 0)
        phy_memory_buffers = meminfo_data.get("Buffers", 0)

        phy_memory_cached = (
            phy_memory_raw_cached + phy_memory_buffers + phy_memory_sreclaimable
        )
        phy_memory_actual_used = round(
            phy_memory_total
            - phy_memory_free
            - phy_memory_buffers
            - phy_memory_raw_cached
            - phy_memory_sreclaimable
        )
        phy_memory_used = round(phy_memory_total - phy_memory_available)
        phy_memory_used_percent = round(
            (int(phy_memory_used) / int(phy_memory_total)) * 100, 1
        )

        swap_memory_total = meminfo_data.get("SwapTotal", 0)
        swap_memory_free = meminfo_data.get("SwapFree", 0)

        swap_memory_cached = meminfo_data.get("SwapCached", 0)
        swap_memory_used = round(swap_memory_total - swap_memory_free)

        try:
            swap_memory_used_percent = round(
                (int(swap_memory_used) / int(swap_memory_total)) * 100, 1
            )  # TODO: fix ZeroDivisionError

        except ZeroDivisionError:
            swap_memory_used_percent = 0

        data = {
            "physical": {
                "values": {
                    "total": phy_memory_total,
                    "used": phy_memory_used,
                    "actual_used": phy_memory_actual_used,
                    "available": phy_memory_available,
                    "free": phy_memory_free,
                    "cached": phy_memory_cached,
                },
                "percentage": {
                    "used": phy_memory_used_percent,
                    "actual_used": round(
                        (int(phy_memory_actual_used) / int(phy_memory_total)) * 100, 1
                    ),
                    "available": round(100 - phy_memory_used_percent, 1),
                    "free": round(
                        (int(phy_memory_free) / int(phy_memory_total)) * 100, 1
                    ),
                    "cached": round((phy_memory_cached / phy_memory_total) * 100, 1),
                },
            },
            "virtual": {
                "values": {
                    "total": swap_memory_total,
                    "used": swap_memory_used,
                    "free": swap_memory_free,
                    "cached": swap_memory_cached,
                },
                "percentage": {
                    "used": swap_memory_used_percent,
                    "free": round(100 - swap_memory_used_percent, 1),
                },
            },
        }

        return data