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metrics.py
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metrics.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import signal
import httpx
import asyncio
from prometheus_client.core import GaugeMetricFamily, CounterMetricFamily
from prometheus_client import generate_latest, CollectorRegistry
from fastapi import FastAPI, Query, HTTPException
from fastapi.responses import PlainTextResponse, Response
import uvicorn
from os import getenv
class TasmotaCollector(object):
def __init__(self, ip, user=None, password=None):
self.ip = ip
self.user = user
self.password = password
def collect(self):
response = asyncio.run(self.fetch())
for key in response:
metric_name = "tasmota_" + key.lower().replace(" ", "_")
metric = response[key].split()[0]
unit = None
if len(response[key].split()) > 1:
unit = response[key].split()[1]
if (
"today" in metric_name
or "yesterday" in metric_name
or "total" in metric_name
):
r = CounterMetricFamily(metric_name, key, labels=["device"], unit=unit)
else:
r = GaugeMetricFamily(metric_name, key, labels=["device"], unit=unit)
r.add_metric([self.ip], metric)
yield r
async def fetch(self):
url = f"http://{self.ip}/?m=1"
async with httpx.AsyncClient() as client:
if self.user and self.password:
auth = httpx.BasicAuth(self.user, self.password)
else:
auth = None
page = await client.get(url, auth=auth)
if page.status_code != 200:
raise HTTPException(
status_code=page.status_code,
detail="Failed to fetch data from device",
)
values = {}
string_values = str(page.text).split("{s}")
for i in range(1, len(string_values)):
try:
label = string_values[i].split("{m}")[0]
value = string_values[i].split("{m}")[1].split("{e}")[0]
if "<td" in value:
value = value.replace("</td><td style='text-align:left'>", "")
value = value.replace("</td><td> </td><td>", "")
values[label] = value
except IndexError:
continue
return values
app = FastAPI()
@app.get("/", response_class=PlainTextResponse)
def root():
return (
"Welcome to Tasmota prometheus exporter!\n"
"Use the /probe endpoint with the 'target' query parameter to get metrics from a Tasmota device.\n"
"Example: /probe?target=192.168.1.1\n"
)
@app.get("/probe")
def probe(target: str = Query(...), user: str = None, password: str = None):
try:
registry = CollectorRegistry()
collector = TasmotaCollector(target, user, password)
registry.register(collector)
metrics = generate_latest(registry)
return Response(content=metrics, media_type="text/plain")
except Exception as e:
raise HTTPException(status_code=500, detail=str(e))
def signal_handler(signal, frame):
print(f"Signal {signal} caught, shutting down gracefully...")
sys.exit(0)
if __name__ == "__main__":
signal.signal(signal.SIGINT, signal_handler)
signal.signal(signal.SIGTERM, signal_handler)
port = int(getenv("EXPORTER_PORT", 8000))
uvicorn.run(app, host="0.0.0.0", port=port)