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#!/usr/bin/env python3
# Example of streaming sensor values from openbmc using the /subscribe api
# requires websockets package to be installed
import asyncio
import ssl
import websockets
import base64
import json
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("--host", help="Host to connect to", required=True)
parser.add_argument(
"--username", help="Username to connect with", default="root")
parser.add_argument("--password", help="Password to use", default="0penBmc")
parser.add_argument('--ssl', default=True,
action=argparse.BooleanOptionalAction)
args = parser.parse_args()
sensor_type_map = {
"voltage": "Volts",
"power": "Watts",
"fan": "RPM",
"fan_tach": "RPM",
"temperature": "Degrees C",
"altitude": "Meters",
"current": "Amps",
"energy": "Joules",
"cfm": "CFM"
}
async def hello():
protocol = 'ws'
if args.ssl:
protocol += 's'
uri = '{}://{}/subscribe'.format(protocol, args.host)
ssl_context = ssl.SSLContext()
authbytes = "{}:{}".format(args.username, args.password).encode('ascii')
auth = "Basic {}".format(base64.b64encode(authbytes).decode('ascii'))
headers = {"Authorization": auth}
async with \
websockets.connect(uri, ssl=ssl_context, extra_headers=headers) \
if args.ssl else websockets.connect(uri, extra_headers=headers) \
as websocket:
request = json.dumps({
"paths": ["/xyz/openbmc_project/sensors"],
"interfaces": ["xyz.openbmc_project.Sensor.Value"]
})
await websocket.send(request)
while True:
payload = await websocket.recv()
j = json.loads(payload)
path = j.get("path", "unknown/unknown")
name = path.split("/")[-1]
sensor_type = path.split("/")[-2]
units = sensor_type_map.get(sensor_type, "")
properties = j.get("properties", [])
value = properties.get("Value", None)
if value is None:
continue
print(f"{name:<20} {value:4.02f} {units}")
asyncio.get_event_loop().run_until_complete(hello())
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