stlist.py

#!/usr/bin/env python
# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
# Requires the following modules
#   apt-get install python-requests python-bs4
#   pip install requests beautifulsoup4 netaddr
from __future__ import print_function
import sys
import requests
import os
import time
from bs4 import BeautifulSoup
from optparse import OptionParser


# http://stackoverflow.com/a/14981125
def warning(*objs):
    print("WARNING: ", *objs, file=sys.stderr)


# http://stackoverflow.com/a/16695277
def DownloadFile(url, local_filename):
    warning("Downloading %s to %s" % (url, local_filename))
    r = requests.get(url)
    with open(local_filename, 'wb') as f:
        for chunk in r.iter_content(chunk_size=1024):
            if chunk:  # filter out keep-alive new chunks
                f.write(chunk)
    return


def is_st(tag):
    if tag.name == "device" and len(tag.find_all("radio")) > 1:
        return True
    else:
        return False


def main():
    usage = "usage: %prog zone"
    parser = OptionParser(usage)
    (options, args) = parser.parse_args()
    if len(args) != 1:
        parser.error("incorrect number of arguments")
    zone = args[0]
    cnml_file = "/tmp/%s.cnml" % zone
    cnml_url = "http://guifi.net/ca/guifi/cnml/%s/detail" % zone

    try:
        age = time.time() - os.path.getmtime(cnml_file)
        if age > 3600*4:
            warning("File age %s" % age)
            warning("Too old, redownload")
            DownloadFile(cnml_url, cnml_file)
    except OSError:
        warning("%s does not exist" % cnml_file)
        DownloadFile(cnml_url, cnml_file)

    with open(cnml_file, 'r') as f:
        cnml = BeautifulSoup(f.read())
        for st in cnml.find_all(is_st):
            print("%6s %30s http://guifi.net/ca/guifi/device/%s"
                  % (st["id"], st["title"], st["id"]))

if __name__ == "__main__":
    main()