83 lines
3.0 KiB
Python
83 lines
3.0 KiB
Python
# Python 2 script to check cpu load, cpu temperature and free space,
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# on a Raspberry Pi computer and publish the data to a MQTT server.
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# RUN pip install paho-mqtt
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# RUN sudo apt-get install python-pip
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from __future__ import division
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import subprocess, time, socket, os
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import paho.mqtt.client as paho
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import config
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#get device host name - used in mqtt topic
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hostname = socket.gethostname()
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#mqtt server configuration
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mqtt_host = config.mqtt_host
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mqtt_user = config.mqtt_user
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mqtt_password = config.mqtt_password
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mqtt_port = config.mqtt_port
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mqtt_topic_prefix = config.mqtt_topic_prefix
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def check_used_space(path):
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st = os.statvfs(path)
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free_space = st.f_bavail * st.f_frsize
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total_space = st.f_blocks * st.f_frsize
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used_space = int(100 - ((free_space / total_space) * 100))
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return used_space
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def check_cpu_load():
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#bash command to get cpu load from uptime command
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p = subprocess.Popen("uptime", shell=True, stdout=subprocess.PIPE).communicate()[0]
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cores = subprocess.Popen("nproc", shell=True, stdout=subprocess.PIPE).communicate()[0]
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cpu_load = p.split("average:")[1].split(",")[0].replace(' ', '')
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cpu_load = float(cpu_load)/int(cores)*100
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return cpu_load
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def check_voltage():
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full_cmd = "vcgencmd measure_volts | cut -f2 -d= | sed 's/000//'"
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voltage = subprocess.Popen(full_cmd, shell=True, stdout=subprocess.PIPE).communicate()[0]
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voltage = voltage.strip()[:-1]
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return voltage
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def check_cpu_temp():
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full_cmd = "/opt/vc/bin/vcgencmd measure_temp"
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p = subprocess.Popen(full_cmd, shell=True, stdout=subprocess.PIPE).communicate()[0]
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cpu_temp = p.replace('\n', ' ').replace('\r', '').split("=")[1].split("'")[0]
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return cpu_temp
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def check_sys_clock_speed():
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full_cmd = "awk '{printf (\"%0.0f\",$1/1000); }' </sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq"
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return subprocess.Popen(full_cmd, shell=True, stdout=subprocess.PIPE).communicate()[0]
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def publish_to_mqtt (cpu_load, cpu_temp, used_space, voltage, sys_clock_speed):
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#connect to mqtt server
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client = paho.Client()
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client.username_pw_set(mqtt_user, mqtt_password)
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client.connect(mqtt_host, mqtt_port)
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#publish monitored values to MQTT
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client.publish(mqtt_topic_prefix+"/"+hostname+"/cpuload", cpu_load, qos=1)
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time.sleep(1)
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client.publish(mqtt_topic_prefix+"/"+hostname+"/cputemp", cpu_temp, qos=1)
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time.sleep(1)
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client.publish(mqtt_topic_prefix+"/"+hostname+"/diskusage", used_space, qos=1)
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time.sleep(1)
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client.publish(mqtt_topic_prefix+"/"+hostname+"/voltage", voltage, qos=1)
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time.sleep(1)
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client.publish(mqtt_topic_prefix+"/"+hostname+"/sys_clock_speed", sys_clock_speed, qos=1)
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#disconect from mqtt server
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client.disconnect()
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if __name__ == '__main__':
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#collect the monitored values
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cpu_load = check_cpu_load()
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cpu_temp = check_cpu_temp()
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used_space = check_used_space('/')
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voltage = check_voltage()
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sys_clock_speed = check_sys_clock_speed()
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#Publish messages to MQTT
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publish_to_mqtt(cpu_load, cpu_temp, used_space, voltage, sys_clock_speed)
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