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#
# Part of info-beamer hosted. You can find the latest version
# of this file at:
#
# https://github.com/info-beamer/package-sdk
#
# Copyright (c) 2014,2015,2016,2017,2018 Florian Wesch <fw@info-beamer.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
VERSION = "1.3"
import os
import sys
import json
import time
import errno
import socket
import select
import pyinotify
import thread
import threading
import requests
from tempfile import NamedTemporaryFile
types = {}
def init_types():
def type(fn):
types[fn.__name__] = fn
return fn
@type
def color(value):
return value
@type
def string(value):
return value
@type
def text(value):
return value
@type
def section(value):
return value
@type
def boolean(value):
return value
@type
def select(value):
return value
@type
def duration(value):
return value
@type
def integer(value):
return value
@type
def float(value):
return value
@type
def font(value):
return value
@type
def device(value):
return value
@type
def resource(value):
return value
@type
def json(value):
return value
@type
def custom(value):
return value
@type
def date(value):
return value
init_types()
def log(msg):
print >>sys.stderr, "[hosted.py] %s" % msg
def abort_service(reason):
log("restarting service (%s)" % reason)
try:
thread.interrupt_main()
except:
pass
time.sleep(2)
os.kill(os.getpid(), 2)
time.sleep(2)
os.kill(os.getpid(), 15)
time.sleep(2)
os.kill(os.getpid(), 9)
time.sleep(100)
class Configuration(object):
def __init__(self):
self._restart = False
self._options = []
self._config = {}
self._parsed = {}
self.parse_node_json(do_update=False)
self.parse_config_json()
def restart_on_update(self):
log("going to restart when config is updated")
self._restart = True
def parse_node_json(self, do_update=True):
with open("node.json") as f:
self._options = json.load(f).get('options', [])
if do_update:
self.update_config()
def parse_config_json(self, do_update=True):
with open("config.json") as f:
self._config = json.load(f)
if do_update:
self.update_config()
def update_config(self):
if self._restart:
return abort_service("restart_on_update set")
def parse_recursive(options, config, target):
# print 'parsing', config
for option in options:
if not 'name' in option:
continue
if option['type'] == 'list':
items = []
for item in config[option['name']]:
parsed = {}
parse_recursive(option['items'], item, parsed)
items.append(parsed)
target[option['name']] = items
continue
target[option['name']] = types[option['type']](config[option['name']])
parsed = {}
parse_recursive(self._options, self._config, parsed)
log("updated config")
self._parsed = parsed
@property
def raw(self):
return self._config
@property
def metadata(self):
return self._config['__metadata']
def __getitem__(self, key):
return self._parsed[key]
def __getattr__(self, key):
return self._parsed[key]
def setup_inotify(configuration):
class EventHandler(pyinotify.ProcessEvent):
def process_default(self, event):
basename = os.path.basename(event.pathname)
if basename == 'node.json':
log("node.json changed")
configuration.parse_node_json()
elif basename == 'config.json':
log("config.json changed!")
configuration.parse_config_json()
elif basename.endswith('.py'):
abort_service("python file changed")
wm = pyinotify.WatchManager()
notifier = pyinotify.ThreadedNotifier(wm, EventHandler())
notifier.daemon = True
notifier.start()
wm.add_watch('.', pyinotify.IN_MOVED_TO)
class Node(object):
def __init__(self, node):
self._node = node
self._sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
def send_raw(self, raw):
log("sending %r" % (raw,))
self._sock.sendto(raw, ('127.0.0.1', 4444))
def send(self, data):
self.send_raw(self._node + data)
@property
def is_top_level(self):
return self._node == "root"
@property
def path(self):
return self._node
def write_file(self, filename, content):
f = NamedTemporaryFile(prefix='.hosted-py-tmp', dir=os.getcwd())
try:
f.write(content)
except:
traceback.print_exc()
f.close()
raise
else:
f.delete = False
f.close()
os.rename(f.name, filename)
def write_json(self, filename, data):
self.write_file(filename, json.dumps(
data,
ensure_ascii=False,
separators=(',',':'),
).encode('utf8'))
class Sender(object):
def __init__(self, node, path):
self._node = node
self._path = path
def __call__(self, data):
if isinstance(data, (dict, list)):
raw = "%s:%s" % (self._path, json.dumps(
data,
ensure_ascii=False,
separators=(',',':'),
).encode('utf8'))
else:
raw = "%s:%s" % (self._path, data)
self._node.send_raw(raw)
def __getitem__(self, path):
return self.Sender(self, self._node + path)
def __call__(self, data):
return self.Sender(self, self._node)(data)
def scratch_cached(self, filename, generator):
cached = os.path.join(os.environ['SCRATCH'], filename)
if not os.path.exists(cached):
f = NamedTemporaryFile(prefix='scratch-cached-tmp', dir=os.environ['SCRATCH'])
try:
generator(f)
except:
raise
else:
f.delete = False
f.close()
os.rename(f.name, cached)
if os.path.exists(filename):
try:
os.unlink(filename)
except:
pass
os.symlink(cached, filename)
class APIError(Exception):
pass
class APIProxy(object):
def __init__(self, apis, api_name):
self._apis = apis
self._api_name = api_name
@property
def url(self):
index = self._apis.get_api_index()
if not self._api_name in index:
raise APIError("api '%s' not available" % (self._api_name,))
return index[self._api_name]['url']
def unwrap(self, r):
r.raise_for_status()
if r.status_code == 304:
return None
if r.headers['content-type'] == 'application/json':
resp = r.json()
if not resp['ok']:
raise APIError(u"api call failed: %s" % (
resp.get('error', '<unknown error>'),
))
return resp.get(self._api_name)
else:
return r.content
def add_defaults(self, kwargs):
if not 'timeout' in kwargs:
kwargs['timeout'] = 10
def get(self, **kwargs):
self.add_defaults(kwargs)
try:
return self.unwrap(self._apis.session.get(
url = self.url,
**kwargs
))
except APIError:
raise
except Exception as err:
raise APIError(err)
def post(self, **kwargs):
self.add_defaults(kwargs)
try:
return self.unwrap(self._apis.session.post(
url = self.url,
**kwargs
))
except APIError:
raise
except Exception as err:
raise APIError(err)
class APIs(object):
def __init__(self, config):
self._config = config
self._index = None
self._valid_until = 0
self._lock = threading.Lock()
self._session = requests.Session()
self._session.headers.update({
'User-Agent': 'hosted.py version/%s' % (VERSION,)
})
def update_apis(self):
log("fetching api index")
r = self._session.get(
url = self._config.metadata['api'],
timeout = 5,
)
r.raise_for_status()
resp = r.json()
if not resp['ok']:
raise APIError("cannot retrieve api index")
self._index = resp['apis']
self._valid_until = resp['valid_until'] - 300
def get_api_index(self):
with self._lock:
now = time.time()
if now > self._valid_until:
self.update_apis()
return self._index
@property
def session(self):
return self._session
def list(self):
try:
index = self.get_api_index()
return sorted(index.keys())
except Exception as err:
raise APIError(err)
def __getitem__(self, api_name):
return APIProxy(self, api_name)
def __getattr__(self, api_name):
return APIProxy(self, api_name)
class GPIO(object):
def __init__(self):
self._pin_fd = {}
self._state = {}
self._fd_2_pin = {}
self._poll = select.poll()
self._lock = threading.Lock()
def setup_pin(self, pin, direction="in", invert=False):
if not os.path.exists("/sys/class/gpio/gpio%d" % pin):
with open("/sys/class/gpio/export", "wb") as f:
f.write(str(pin))
# mdev is giving the newly create GPIO directory correct permissions.
for i in range(10):
try:
with open("/sys/class/gpio/gpio%d/active_low" % pin, "wb") as f:
f.write("1" if invert else "0")
break
except IOError as err:
if err.errno != errno.EACCES:
raise
time.sleep(0.1)
log("waiting for GPIO permissions")
else:
raise IOError(errno.EACCES, "Cannot access GPIO")
with open("/sys/class/gpio/gpio%d/direction" % pin, "wb") as f:
f.write(direction)
def set_pin_value(self, pin, high):
with open("/sys/class/gpio/gpio%d/value" % pin, "wb") as f:
f.write("1" if high else "0")
def monitor(self, pin, invert=False):
if pin in self._pin_fd:
return
self.setup_pin(pin, direction="in", invert=invert)
with open("/sys/class/gpio/gpio%d/edge" % pin, "wb") as f:
f.write("both")
fd = os.open("/sys/class/gpio/gpio%d/value" % pin, os.O_RDONLY)
self._state[pin] = bool(int(os.read(fd, 5)))
self._fd_2_pin[fd] = pin
self._pin_fd[pin] = fd
self._poll.register(fd, select.POLLPRI | select.POLLERR)
def poll(self, timeout=1000):
changes = []
for fd, evt in self._poll.poll(timeout):
os.lseek(fd, 0, 0)
state = bool(int(os.read(fd, 5)))
pin = self._fd_2_pin[fd]
with self._lock:
prev_state, self._state[pin] = self._state[pin], state
if state != prev_state:
changes.append((pin, state))
return changes
def poll_forever(self):
while 1:
for event in self.poll():
yield event
def on(self, pin):
with self._lock:
return self._state.get(pin, False)
class Device(object):
def __init__(self):
self._socket = None
self._gpio = GPIO()
@property
def gpio(self):
return self._gpio
@property
def screen_resolution(self):
with open("/sys/class/graphics/fb0/virtual_size", "rb") as f:
return [int(val) for val in f.read().strip().split(',')]
def ensure_connected(self):
if self._socket:
return True
try:
log("establishing upstream connection")
self._socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self._socket.connect(os.getenv('SYNCER_SOCKET', "/tmp/syncer"))
return True
except Exception as err:
log("cannot connect to upstream socket: %s" % (err,))
return False
def send_raw(self, raw):
try:
if self.ensure_connected():
self._socket.send(raw + '\n')
except Exception as err:
log("cannot send to upstream: %s" % (err,))
if self._socket:
self._socket.close()
self._socket = None
def send_upstream(self, **data):
self.send_raw(json.dumps(data))
def turn_screen_off(self):
self.send_raw("tv off")
def turn_screen_on(self):
self.send_raw("tv on")
def screen(self, on=True):
if on:
self.turn_screen_on()
else:
self.turn_screen_off()
def reboot(self):
self.send_raw("system reboot")
def halt_until_powercycled(self):
self.send_raw("system halt")
def restart_infobeamer(self):
self.send_raw("infobeamer restart")
def verify_cache(self):
self.send_raw("syncer verify_cache")
if __name__ == "__main__":
device = Device()
while 1:
try:
command = raw_input("syncer> ")
device.send_raw(command)
except (KeyboardInterrupt, EOFError):
break
except:
import traceback
traceback.print_exc()
else:
log("starting version %s" % (VERSION,))
node = NODE = Node(os.environ['NODE'])
device = DEVICE = Device()
config = CONFIG = Configuration()
api = API = APIs(CONFIG)
setup_inotify(CONFIG)
log("ready to go!")
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