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async_hostmon.py
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async_hostmon.py
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#!/usr/bin/python3
##
## Author: Logu R<logu.rangasamy@suse.com>
##
import os
import yaml
import json
import asyncio
from flask import Flask, render_template, jsonify, request
from flask_caching import Cache
from cachetools import cached, TTLCache
# Constants
CACHE_TIMEOUT = 60
CMD_CACHE_TIMEOUT = CACHE_TIMEOUT
REFHOST_YML = os.path.join(os.environ.get("HOME"), ".local/share/refdb/refhosts.yml")
app = Flask(__name__, static_url_path='/static', static_folder='static')
app.config['SECRET_KEY'] = 'secret_key' # Add a secret key for Flask
cache_config = {
'CACHE_TYPE': 'filesystem',
'CACHE_DIR': '.cache1',
'CACHE_THRESHOLD': 1000
}
cache = Cache(app, config=cache_config)
def load_refhost_data(yml_path):
with open(yml_path) as f:
return yaml.safe_load(f)
def get_host_inventory(data):
refhost_inventory = {}
counter = 0
for loc, hosts in data.items():
for host in hosts:
counter += 1
prod = host['product']
prod_vers = prod['version']
major = str(prod_vers['major'])
minor = prod_vers.get('minor')
version_num = major
if minor is not None:
version_num = major + "-" + minor
refhost = {
'sno': counter,
'hostname': host['name'],
'arch': host['arch'],
'product': prod['name'],
'version': version_num,
'location': loc
}
refhost_inventory[host['name']] = refhost
return refhost_inventory
def get_unique_list(data, key):
unique_values = {host_info.get(key) for _, host_info in data.items() if host_info.get(key) is not None}
return sorted(list(unique_values))
def get_specific_refhosts(data, location=None, arch=None, product=None, version=None):
filtered_hosts = {}
for hostname, host_info in data.items():
if (
(not location or host_info['location'] == location) and
(not arch or host_info['arch'] == arch) and
(not product or host_info['product'] == product) and
(not version or host_info['version'] == version)
):
filtered_hosts[hostname] = host_info
return filtered_hosts
@cached(cache = TTLCache(maxsize = 1024, ttl = CMD_CACHE_TIMEOUT))
async def run_cmd(cmd):
r = await asyncio.create_subprocess_shell(
cmd,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE
)
stdout, stderr = await r.communicate() # Capture stdout and stderr data
print(f"{cmd} => {stderr.decode().strip()}") # Print stderr data
return r.returncode, stdout, stderr
return r
def check_icmp(host):
return run_cmd(f"ping -c 1 -w 2 {host}")
def check_ssh(host):
return run_cmd(f"nc -vzw 2 {host} 22")
async def do_probe(probe, host_name):
result = await probe(host_name) # Use await here
status = 'Up' if result[0] == 0 else 'Down' # Access return code from the result tuple
return status
## ===================
async def logic_issue_get_probe_data(data, probe_funcs):
all_host_status = []
tasks = []
for probe_func in probe_funcs:
tasks.extend([do_probe(probe_func, host) for host in data])
results = await asyncio.gather(*tasks)
for host, probe_func, result in zip(data, probe_funcs * len(data), results):
host_status = {'hostname': host}
host_status[f'{probe_func.__name__}_status'] = result
all_host_status.append(host_status)
print (all_host_status)
return all_host_status
async def seq_get_probe_data(data, probe_funcs):
all_host_status = []
tasks = []
for host in data:
host_status = {'hostname': host}
host_tasks = [do_probe(probe_func, host) for probe_func in probe_funcs]
results = await asyncio.gather(*host_tasks)
for probe_func, result in zip(probe_funcs, results):
host_status[f'{probe_func.__name__}_status'] = result
all_host_status.append(host_status)
return all_host_status
async def get_probe_data(data, probe_funcs):
all_host_status = []
tasks = []
for probe_func in probe_funcs:
tasks.extend([do_probe(probe_func, host) for host in data])
#tasks[probe_func.__name__] = [do_probe(probe_func, host) for host in data]
results = await asyncio.gather(*tasks)
print("####", results)
for host in data:
host_status = {'hostname': host}
for probe_func, result in zip(probe_funcs, results):
host_status[f'{probe_func.__name__}_status'] = result
all_host_status.append(host_status)
print (json.dumps(all_host_status, indent=2))
return all_host_status
## ===================
def get_allprobe_data(data):
probes = [check_icmp, check_ssh]
return get_probe_data(data, probes)
def get_query_params():
return {
'location': request.args.get('location'),
'arch': request.args.get('arch'),
'product': request.args.get('product'),
'version': request.args.get('version'),
}
# Load data once at the start of the application
try:
ymldata = load_refhost_data(REFHOST_YML)
refhost_inventory = get_host_inventory(ymldata)
except FileNotFoundError as e:
print(f"Error: {e}. Please make sure the YAML file {REFHOST_YML} exists.")
except Exception as e:
print(f"An unexpected error occurred: {e}")
else:
print("Data loaded successfully.")
# Get filters based on refhost_inventory
filters = {key: get_unique_list(refhost_inventory, key) for key in ['location', 'arch', 'product', 'version']}
@app.route('/')
def index():
return render_template('hostmon.html', filters=filters)
@app.route('/status', methods=['GET'])
@cache.cached(timeout=CACHE_TIMEOUT, key_prefix=lambda: request.url)
def get_status():
params = get_query_params()
data = get_specific_refhosts(refhost_inventory, **params)
# Run the asynchronous function synchronously using asyncio.run
all_status = asyncio.run(get_allprobe_data(data))
return jsonify(all_status)
@app.route('/hostinfo', methods=['GET'])
def get_hostinfo():
params = get_query_params()
data = get_specific_refhosts(refhost_inventory, **params)
return jsonify(data)
if __name__ == '__main__':
app.run(debug=True)