summaryrefslogtreecommitdiff
path: root/run_server.py
blob: a21532059125bca9307c74226186feb1c4ac8cc4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
#!/usr/bin/env python
#
# This file serves the static files in the
# web directory and provides API endpoints
# to read/write the existing markers.
#

import os
from cStringIO import StringIO
import hashlib
import threading
import json
import time

import cherrypy

class SynchronizedJSON(object):
    def __init__(self, filename):
        self._filename = filename
        self._new = {}
        if os.path.exists(self._filename):
            with open(self._filename, 'rb') as f:
                self._new['data'] = f.read()
        else:
            self._new['data'] = '{}'

        self._update_sync_id()
        self.cur = self._new

        self.lock = threading.Lock()

    def _update_sync_id(self):
        doc = json.loads(self._new['data'])
        if 'sync-id' in doc:
            del doc['sync-id']
        hashed_data = json.dumps(doc)
        h = hashlib.sha256()
        h.update(hashed_data)
        doc['sync-id'] = h.hexdigest()
        self._new['data'] = json.dumps(doc, indent=4)
        self._new['sync-id'] = h.hexdigest()

    def set_data(self, data):
        assert self.lock.locked()

        if self.cur['data'] == data:
            return

        self._new = {}
        self._new['data'] = data
        self._update_sync_id()

        with open(self._filename + '.new', 'wb') as f:
            f.write(self._new['data'])
            f.flush()
            os.fsync(f.fileno())
        os.rename(self._filename + '.new', self._filename)

        self.cur = self._new

class EventMapMarkerApi(object):
    def __init__(self, path):
        self.marker_doc = SynchronizedJSON(os.path.join(path, 'markers.json'))

    @cherrypy.expose
    def get(self):
        cherrypy.response.headers['Content-Type']= 'application/json'
        return self.marker_doc.cur['data']

    @cherrypy.expose
    def poll(self, current):
        cherrypy.response.headers['Content-Type']= 'application/json'
        counter = 0
        while self.marker_doc.cur['sync-id'] == current:
            time.sleep(1)
            counter += 1
            if counter >= 20:
                yield ' '
                counter = 0
            if cherrypy.engine.state != cherrypy.engine.states.STARTED:
                break
        yield self.marker_doc.cur['data']

    @cherrypy.expose
    def post(self):
        content_length = cherrypy.request.headers['Content-Length']
        data = cherrypy.request.body.read(int(content_length))

        doc = json.loads(data)

        with self.marker_doc.lock:
            if self.marker_doc.cur['sync-id'] != doc['sync-id']:
                raise cherrypy.HTTPError(503, "Sorry, but the server database changed in between.")
            self.marker_doc.set_data(data)
        cherrypy.response.headers['Content-Type']= 'application/json'
        return '{}'

class EventMapApi(object):
    def __init__(self, path):
        self.markers = EventMapMarkerApi(path)

def test_log(msg, level):
    print "%s, %s" % (msg, level)

if __name__ == '__main__':
    current_dir = os.path.dirname(os.path.abspath(__file__))
    cherrypy.engine.subscribe('log', test_log)
    cherrypy.config.update({
        'server.socket_host': '127.0.0.1',
        'server.socket_port': 8023,
        'server.thread_pool_max': 500,
        'server.thread_pool': 100,
        'log.screen': True
    })

    cherrypy.tree.mount(None, '/', {
        '/': {
            'tools.staticdir.on': True,
            'tools.staticdir.dir': os.path.join(current_dir, 'web'),
            'tools.staticdir.index': 'index.html',
        }
    })

    cherrypy.tree.mount(EventMapApi(current_dir), '/api', {
        '/': {
            'response.timeout': 600,
            'response.stream': True
        }
    })

    cherrypy.engine.signals.subscribe()
    cherrypy.engine.start()
    cherrypy.engine.block()