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Code Editor : memory_usage.py

import agent_util
import os
import re
import sys
import socket
from agent_util import float

def search_esxtop(headers, search_string):
    for idx, column in enumerate(headers):
        if search_string in column:
            return idx

return None

class MemoryUsagePlugin(agent_util.Plugin):
    textkey = "memory"
    label = "Memory"
    # adding minimum RAM and swap usage
    min_ram = 0
    min_swap = 0

@staticmethod
    def _parse_sysctl(stdout):
        lines = stdout.split("\n")
        sysctl = {}

for line in lines:
            m = re.search(r"^(.+?)\s*:\s*(.+)$", line)
            if not m: continue
            k = str(m.group(1))
            v = m.group(2)
            if v.isdigit(): v = int(v)
            sysctl[k] = v

return sysctl

@classmethod
    def get_metadata(self, config):
        if 'freebsd' in sys.platform:
            sysctl = agent_util.which('sysctl')
            status = agent_util.SUPPORTED
            msg = None

if not sysctl:
                self.log.info("sysctl binary not found")
                status = agent_util.UNSUPPORTED
                msg = "sysctl binary not found"
                return {}

if status is agent_util.SUPPORTED:
                ret, output = agent_util.execute_command(sysctl+" -a")
                if config.get("debug", False):
                    self.log.debug('#####################################################')
                    self.log.debug("Memory Usage command 'sysctl -a' output:")
                    self.log.debug(str(output))
                    self.log.debug('#####################################################')
                if ret != 0 or not output:
                    status = agent_util.UNSUPPORTED
                    msg = "error executing 'sysctl -a'"

if status is agent_util.SUPPORTED:
                    d = self._parse_sysctl(output)

required_keys = (
                        "hw.pagesize",
                        "hw.physmem",
                        "vfs.bufspace",
                        "vm.stats.vm.v_inactive_count",
                        "vm.stats.vm.v_active_count",
                        "vm.stats.vm.v_cache_count",
                        "vm.stats.vm.v_free_count"
                    )

# here we're making sure the set of all the keys we need
                    # are in the set of all keys (subset)
                    for key in required_keys:
                        if key not in d.keys():
                            status = agent_util.UNSUPPORTED
                            msg = "could not find all the required sysctl keys"
                            break

data = {
                "ram.percent": {
                    "label": "RAM percent usage",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "percent"
                },
                "ram.kb_used": {
                    "label": "RAM used (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
                "ram.kb_buffer": {
                    "label": "RAM buffer (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
                "ram.kb_active": {
                    "label": "RAM active (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
                "ram.kb_inactive": {
                    "label": "RAM inactive (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
                "ram.kb_cached": {
                    "label": "RAM cached (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
            }
            return data

elif "darwin" in sys.platform:
            status = agent_util.SUPPORTED
            msg = ""
            data = {
                "ram.percent": {
                    "label": "RAM percent usage",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "percent"
                },
                "ram.kb_used": {
                    "label": "RAM used (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
                "ram.kb_active": {
                    "label": "RAM active (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
                "ram.kb_inactive": {
                    "label": "RAM inactive (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
                "ram.kb_wired": {
                    "label": "RAM wired (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB"
                },
            }
            return data

elif 'aix' in sys.platform:
            status = agent_util.SUPPORTED
            msg = None

# Figure out how much memory we have
            retcode, output = agent_util.execute_command('svmon -O,unit=KB')
            output = output.split('\n')

max_ram = None
            max_swap = None
            for line in output:
                if line.startswith('memory'):
                    parts = line.split()
                    # max ram in kb
                    max_ram = int(parts[1])
                if line.startswith('pg space'):
                    parts = line.split()
                    max_swap = int(parts[2])

elif 'sunos' in sys.platform:
            status = agent_util.SUPPORTED
            msg = None

# Figure out how much memory we have
            max_ram = None
            retcode, output = agent_util.execute_command('/usr/sbin/prtconf')
            output = output.split('\n')
            for line in output:
                if "Memory" not in line: continue
                fields = line.split()
                max_ram = int(fields[2])*1024

elif 'vmware' in sys.platform:
            # Default Linux logic
            status = agent_util.SUPPORTED
            msg = None

ret, mem_str = agent_util.execute_command("esxcli hardware memory get | grep 'Physical Memory'")
            if ret == 0:
                ram_total = (float(mem_str.split(':')[1].split()[0]) / 1024) / 1024
            else:
                status = agent_util.MISCONFIGURED
                msg = "ERROR RUNNING ESXCLI: %s" % mem_str

data = {
                "ram.percent": {
                    "label": "RAM percent usage",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "min_value": 0,
                    "max_value": 100,
                },
                "ram.mb_used": {
                    "label": "RAM used (MB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "mB",
                    "min_value": 0,
                    "max_value": ram_total,
                }
            }
            return data

elif 'hp-ux' in sys.platform:
            status = agent_util.SUPPORTED
            msg = None
            ret, output = agent_util.execute_command('swapinfo -ta')
            max_ram = None
            max_swap = None
            for line in output:
                if line.startswith('memory'):
                    parts = line.split()
                    # max ram in kb
                    max_ram = int(parts[1])
                if line.startswith('dev'):
                    parts = line.split()
                    max_swap = int(parts[1])

else:
            # Default Linux logic
            status = agent_util.SUPPORTED
            msg = None
            if not os.path.exists("/proc/meminfo"):
                status = agent_util.MISCONFIGURED
                msg = "Enable procfs."

# Get memory info to find max values
            lines = open("/proc/meminfo", "r").readlines()
            usage_info = {}
            for line in lines:
                line = line.strip()
                m = re.match(r'^(?P<key>.+?):\s+(?P<value>\d+)', line)
                usage_info[m.group("key")] = int(m.group("value"))
            ram_total = usage_info.get("MemTotal", 0)
            swap_total = usage_info.get("SwapTotal", 0)

data = {
                "ram.percent": {
                    "label": "RAM percent usage",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "min_value": 0,
                    "max_value": 100,
                },
                "ram.kb_used": {
                    "label": "RAM used (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB",
                    "min_value": 0,
                    "max_value": ram_total,
                },
                "ram.kb_buffer": {
                    "label": "RAM buffer (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB",
                    "min_value": 0,
                    "max_value": ram_total,
                },
                "swap.percent": {
                    "label": "Swap percent usage",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "percent",
                    "min_value": 0,
                    "max_value": 100,
                },
                "swap.kb_used": {
                    "label": "Swap used (Kb)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "min_value": 0,
                    "max_value": swap_total,
                },
                "ram.kb_active": {
                    "label": "RAM active (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB",
                    "min_value": 0,
                    "max_value": ram_total,
                },
                "ram.kb_inactive": {
                    "label": "RAM inactive (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB",
                    "min_value": 0,
                    "max_value": ram_total,
                },
                "ram.kb_cached": {
                    "label": "RAM cached (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB",
                    "min_value": 0,
                    "max_value": ram_total,
                },
                "swap.kb_cached": {
                    "label": "Swap cached (kB)",
                    "options": None,
                    "status": status,
                    "error_message": msg,
                    "unit": "kB",
                    "min_value": 0,
                    "max_value": ram_total,
                }
            }
            return data

def check(self, textkey, data, config):

sysctl = agent_util.which('sysctl')
        if 'freebsd' in sys.platform:
            mem_info = {}

ret, output = agent_util.execute_command(sysctl+' -a')
            d = self._parse_sysctl(output)

buffsize = d["vfs.bufspace"]
            pagesize = d["hw.pagesize"]
            total = d["hw.physmem"]
            inactive = d["vm.stats.vm.v_inactive_count"] * pagesize
            active = d["vm.stats.vm.v_active_count"] * pagesize
            cache = d["vm.stats.vm.v_cache_count"] * pagesize
            free = d["vm.stats.vm.v_free_count"] * pagesize
            avail = inactive + cache + free
            used = total - avail

self.log.debug("buffsize %s" % str(buffsize))
            self.log.debug("pagesize %s" % str(pagesize))
            self.log.debug("total %s" % str(total))
            self.log.debug("inactive %s" % str(inactive))
            self.log.debug("active %s" % str(active))
            self.log.debug("cache %s" % str(cache))
            self.log.debug("free %s" % str(free))
            self.log.debug("avail %s" % str(avail))
            self.log.debug("used %s" % str(used))

mem_info["ram.kb_used"] = used / 1024.0
            if total > 0: mem_info["ram.percent"] = (float(used) / total) * 100.0
            else: mem_info["ram.percent"] = 0.0
            mem_info["ram.kb_active"] = active / 1024.0
            mem_info["ram.kb_inactive"] = inactive / 1024.0
            mem_info["ram.kb_cached"] = cache / 1024.0
            mem_info["ram.kb_buffer"] = buffsize / 1024.0
            # total installed RAM in KB
            ram_max = int(total) / 1024

return mem_info[textkey]

elif "darwin" in sys.platform:
            vmstat = agent_util.which("vm_stat")
            ret, output = agent_util.execute_command(vmstat)
            pageSize = None
            pageToken = 'Mach Virtual Memory Statistics:'
            vm_data = {}
            for line in output.split("\n"):
                if line.startswith(pageToken):
                    try:
                        pageSize = int(line[len(pageToken):].split()[-2])
                        self.log.debug('Memory page size -> {}'.format(pageSize))
                    except Exception as e:
                        pass
                elif ":" in line:
                    try:
                        key, val = line.split(":", 1)
                        val = float(val.strip())
                        vm_data[key] = val
                    except:
                        pass

if pageSize is None:
                self.log.error("Could not compute page size")
                return None

kbMultiplier = float(pageSize / 1024)
            wired = vm_data.get("Pages wired down", 0) * kbMultiplier
            active = vm_data.get("Pages active", 0) * kbMultiplier
            inactive = vm_data.get("Pages inactive", 0) * kbMultiplier
            free = vm_data.get("Pages free", 0) * kbMultiplier

if textkey == "ram.kb_used":
                return wired + active
            elif textkey == "ram.kb_active":
                return active
            elif textkey == "ram.kb_inactive":
                return inactive
            elif textkey == "ram.kb_wired":
                return wired
            elif textkey == "ram.percent":
                return 100. * (wired + active) / (wired + active + inactive + free)

return None

elif 'aix' in sys.platform:

retcode, output = agent_util.execute_command('svmon -O,unit=KB')
            output = output.split('\n')
            self.log.debug("svmon output: %s" % output)

for line in output:
                if line.startswith('memory'):
                    parts = line.split()
                    # max ram in kb
                    max_ram = int(parts[1])
                    if textkey == 'ram.percent':
                        return 100. * int(parts[5]) / int(parts[1])
                    elif textkey == 'ram.kb_used':
                        # svmon -G returns counts in 4096 byte pages
                        return int(parts[2])
                if line.startswith('pg space'):
                    parts = line.split()
                    if textkey == 'swap.percent':
                        return 100. * int(parts[3]) / int(parts[2])
                    elif textkey == 'swap.kb_used':
                        # svmon -G returns counts in 4096 byte pages
                        return int(parts[3])

# Unknown AIX textkey
            return None

elif 'sunos' in sys.platform:

retcode, output = agent_util.execute_command("prstat -s rss 1 1 | awk '{print $4}'")
            output = output.split('\n')
            kb_used = 0
            for line in output:
                if 'RSS' in line or not line: continue

if 'G' in line:
                    used = line.strip('M')
                    kb_used += ((int(used) * 1024)*1024)
                elif 'M' in line:
                    used = line.strip('M')
                    kb_used += (int(used) * 1024)
                elif 'K' in line:
                    used = line.strip('K')
                    kb_used += int(used)

retcode, output = agent_util.execute_command('/usr/sbin/prtconf')
            output = output.split('\n')
            for line in output:
                if "Memory" not in line: continue
                fields = line.split()
                kb_total = int(fields[2])*1024
                # setting this to its own var in case we do something funky with kb_total or reset it somehwere
                max_ram = kb_total

kb_free = kb_total - kb_used
            if textkey == 'ram.percent':
                return 100. * (1.0 - float(kb_free)/float(kb_total))
            elif textkey == 'ram.kb_used':
                return kb_used

# Unknown Solaris textkey
            return None

elif 'vmware' in sys.platform:
            hostname = socket.gethostname()
            ret, mem_str = agent_util.execute_command("esxcli hardware memory get | grep 'Physical Memory'", cache_timeout=agent_util.DEFAULT_CACHE_TIMEOUT)
            if ret == 0:
                mb_total = (int(mem_str.split(':')[1].split()[0]) / 1024) / 1024
                self.log.debug("Found %s MB of RAM installed" % mb_total)
            ret, out = agent_util.execute_command("esxtop -b -n 2 -d 2", cache_timeout=agent_util.DEFAULT_CACHE_TIMEOUT)
            out_list = out.split('\n')
            headers = out_list[0].replace('"', '').split(',')
            data = []
            for idx, val in enumerate(out_list[::1]):
                if not val or val == '': continue
                data = out_list[idx].replace('"', '').split(',')

mb_free_search = r"\\\\%s\Memory\Free MBytes" % hostname
            self.log.debug("Searching VMware for %s" % mb_free_search)

mb_free_idx = search_esxtop(headers, mb_free_search)
            if mb_free_idx:
                self.log.debug("VMware free memory index %s" % mb_free_idx)
                mb_free = float(data[mb_free_idx])
            else:
                self.log.error("Unable to find RAM info from esxcli output")
                return None

if textkey == 'ram.mb_used':
                return mb_total - mb_free
            if textkey == 'ram.percent':
                return (( mb_total - mb_free ) / mb_total ) *100.

if 'hp-ux' in sys.platform:
            ret, out = agent_util.execute_command('swapinfo -ta')
            usage_info = {}
            for line in out.splitlines():
                if line.startswith('dev'):
                    l = line.split()
                    self.log.debug("Swap: %s" % l)
                    usage_info['swap.kb_used'] = float(l[2])
                    if l[2] == 0 or l[2] == '-':
                        usage_info['swap.percent'] = 0
                    else:
                        usage_info['swap.percent'] = (float(l[2]) / float(l[1]))* 100.
                if line.startswith('memory'):
                    l = line.split()
                    self.log.debug("RAM: %s" % l)
                    usage_info['ram.kb_used'] = float(l[2])
                    usage_info['ram.percent'] = (float(l[2]) / float(l[1])) * 100.
            return usage_info.get(textkey, None)

else:
            # Default Linux logic
            lines = open("/proc/meminfo", "r").readlines()

usage_info = {}
            mem_info = {}

for line in lines:
                line = line.strip()
                m = re.match(r'^(?P<key>.+?):\s+(?P<value>\d+)', line)
                usage_info[m.group("key")] = int(m.group("value"))

ram_buffer = usage_info.get("Buffers", 0)
            ram_cached = usage_info.get("Cached", 0)
            ram_active = usage_info.get("Active", 0)
            ram_available = usage_info.get("MemAvailable", 0)
            ram_inactive = usage_info.get("Inactive", 0)
            ram_total = usage_info.get("MemTotal", 0)
            if config.get("percent_usage_override"):
                ram_free = usage_info.get("MemFree", 0)
            elif "MemAvailable" in usage_info:
                ram_free = ram_available
            else:
                ram_free = usage_info.get("MemFree", 0) + ram_buffer + ram_cached
            ram_used = ram_total - ram_free
            # setting max_ram to its own var in case we do something funky with ram_total later
            max_ram = ram_total

mem_info["ram.kb_buffer"] = ram_buffer
            mem_info["ram.kb_used"] = ram_used
            if ram_total > 0: mem_info["ram.percent"] = (float(ram_used) / ram_total) * 100.0
            else: mem_info["ram.percent"] = 0.0
            mem_info["ram.kb_active"] = ram_active
            mem_info["ram.kb_inactive"] = ram_inactive
            mem_info["ram.kb_cached"] = ram_cached

swap_cached = usage_info.get("SwapCached", 0)
            swap_total = usage_info.get("SwapTotal", 0)
            swap_free = usage_info.get("SwapFree", 0)
            swap_used = swap_total - swap_free
            # including max amount of swap as well b/c we calc a percentage on that as well
            max_swap = swap_total

mem_info["swap.kb_used"] = swap_used
            if swap_total > 0: mem_info["swap.percent"] = (float(swap_used) / swap_total) * 100.0
            else: mem_info["swap.percent"] = 0.0
            mem_info["swap.kb_cached"] = swap_cached

self.log.debug("ram_total %s" % str(ram_total))
            self.log.debug("ram_free %s" % str(ram_free))
            self.log.debug("ram_active %s" % str(ram_active))
            self.log.debug("ram_inactive %s" % str(ram_inactive))
            self.log.debug("ram_cached %s" % str(ram_cached))

self.log.debug("swap_total %s" % str(swap_total))
            self.log.debug("swap_free %s" % str(swap_free))
            self.log.debug("swap_used %s" % str(swap_used))
            self.log.debug("swap_cached %s" % str(swap_cached))

return mem_info[textkey]

${this.title}

Code Editor : memory_usage.py