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#!/usr/bin/python

#
# Generate html pages based on the Mirmon data
#
# This script will parse the json files that contain the mirmon
# data and have been generated before. The json data is used to
# generate html pages that visualize the mirmon data in a human
# readable way.
#
#
# Leaflet is used to visualize the mirrors on a world map. Further-
# more Datatables are used to display the mirrors.
#

import datetime
import socket
import os
import tempfile
import urllib.request, json
import xml.etree.ElementTree as ET
import jinja2

html_folder = "/var/www/mirrorstats.gentoo.org/htdocs/"
template_folder = "/var/www/mirrorstats.gentoo.org/gentoo-mirrorstats/html/"
cache_path = "/var/www/mirrorstats.gentoo.org/var/html_data_cache.json"


mirrorstats = [ 'https://mirrorstats.gentoo.org/rsync/state.json',
                'https://mirrorstats.gentoo.org/distfiles/state.json',
                'https://mirrorstats.gentoo.org/snapshots/state.json',
                'https://mirrorstats.gentoo.org/releases/state.json',
                'https://mirrorstats.gentoo.org/experimental/state.json'
              ]

cache_data = {}


#
# Retrieve and parse the JSON at the given URL
#
def getJson(url):
    req = urllib.request.Request(url)
    r = urllib.request.urlopen(req).read()
    return json.loads(r.decode('utf-8'))


#
# Retrieve and parse the XML at the given URL
#
def getXML(url):
    req = urllib.request.Request(url)
    r = urllib.request.urlopen(req).read()
    return ET.loads(r.decode('utf-8')).getroot()


#
# Get the ip of the given host
#
def getIp(hostname):
    try:
        ip = socket.gethostbyname(hostname)
    except:
        ip = ""
    return ip


#
# Render the stats template for a given page, i.e. all, rsync, distfiles...
#
def renderStatsTemplate(templateEnv, page):
    if page == "all":
        mirrorstatsList = mirrorstats
        page_name = "index"
    else:
        mirrorstatsList = ['https://mirrorstats.gentoo.org/' + page + '/state.json']
        page_name = page

    lastUpdate, hostList = getHostList(mirrorstatsList)
    template = templateEnv.get_template("stats.jinja2")
    template.stream(lastUpdate=lastUpdate, type=page, mirrors=hostList, locations=json.dumps(hostList)).dump(html_folder + page_name + ".html")
    return lastUpdate


# read the cache
if os.path.exists(cache_path):
    with open(cache_path, mode='rt') as json_file:
        try:
            cache_data = json.load(json_file)
        except:
            pass

#
# The all mirrors that are present in the given list
#
def getHostList(mirrorstatsList):
    hosts = {}
    lastUpdate = ""

    # process all mirrors
    for mirror_url in mirrorstatsList:

        mirrorData = getJson(mirror_url)
        lastUpdate = datetime.datetime.fromtimestamp(int(mirrorData['LastUpdate'])).strftime('%Y-%m-%d %H:%M:%S')

        for mirror in mirrorData['Mirrors']:
            if len(mirrorData['Mirrors'][mirror]) >= 0:
                for mirrorHost in mirrorData['Mirrors'][mirror]:
                    hostname = mirrorHost['Host']
                    if hostname not in hosts:
                        hosts[hostname] = {}

                    hosts[hostname]['Hostname'] = hostname

                    if hostname in cache_data['hosts']:
                        ip = cache_data['hosts'][hostname]
                    else:
                        ip = getIp(hostname)
                        # populate cache with new value
                        cache_data['hosts'][hostname] = ip

                    if ip != "":
                        hosts[hostname]['Ip'] = ip

                    if 'Stats' not in hosts[hostname]:
                        hosts[hostname]['Stats'] = []

                    mirrorHost['Type'] = mirror_url.replace("https://mirrorstats.gentoo.org/", "").replace("/state.json", "")
                    hosts[hostname]['Stats'].append(mirrorHost)

    # compute available protocols
    for host in hosts:
        protocols = []
        for stat in hosts[host]['Stats']:
            protocols.append(stat['Protocol'])

        hosts[host]['Protocols'] = list(set(protocols))

    # compute mirror locations
    for host in hosts:
        if 'Ip' not in hosts[host]:
            continue

        ip = hosts[host]['Ip']
        if ip in cache_data['ips']:
            hosts[host]['Location'] = cache_data['ips'][ip]
        else:
            mirrorGeoData = getJson("https://ipinfo.io/" + ip + "/json")
            hosts[host]['Location'] =  mirrorGeoData['loc']
            # populate cache with new value
            cache_data['ips'][ip] = mirrorGeoData['loc']

    return lastUpdate, hosts


#
# render jinja2
#
templateLoader = jinja2.FileSystemLoader(searchpath=template_folder)
templateEnv = jinja2.Environment(loader=templateLoader)

## stats
lastUpdate = renderStatsTemplate(templateEnv, "all")
renderStatsTemplate(templateEnv, "rsync")
renderStatsTemplate(templateEnv, "distfiles")
renderStatsTemplate(templateEnv, "snapshots")
renderStatsTemplate(templateEnv, "releases")
renderStatsTemplate(templateEnv, "experimental")

## about
template = templateEnv.get_template("help.jinja2")
template.stream(lastUpdate=lastUpdate).dump(html_folder + "help.html")


#
# write the cache
#
with tempfile.NamedTemporaryFile(dir=os.path.dirname(cache_path), delete=False, mode='wt') as fout:
    json.dump(cache_data, fout)
    os.chmod(fout.name, 644)
    os.replace(fout.name, cache_path)


#
# finish
#
#print("Finished.")