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ivt490_flatfs.py
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ivt490_flatfs.py
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#!/usr/bin/env python
# Released under the MIT license, http://per.mit-license.org/2012
import time, errno, threading, stat, os
import serial, copy, traceback
SEROPTS = {
"port": "/dev/ttyUSB0",
"baudrate": 9600,
"timeout": 5
}
import fuse
from fuse import Fuse
# Must specify Fuse API version
fuse.fuse_python_api = (0, 2)
fuse.feature_assert("has_fsinit", "has_fsdestroy")
DIR = 0755 | stat.S_IFDIR
FILE = 0644 | stat.S_IFREG
LINK = 0644 | stat.S_IFLNK
def closeIgnoringError(closeable):
try:
closeable.close()
except:
pass # ignore
def reader(log, producer, callback, done):
log("Consumer thread starting")
is_open = False
open_when = time.time()
while not done.wait(0.1):
try:
if not is_open and time.time() >= open_when:
log("Opening the producer")
messages = []
producer.open(messages)
for msg in messages:
log(msg)
is_open = True
if is_open:
data = producer.get()
if data:
callback(data.split(";"))
except:
err = traceback.format_exc()
log("Error in the consumer thread: %s" % (err, ))
closeIgnoringError(producer)
is_open = False
log("Will re-open the producer in 60 seconds...")
open_when = time.time() + 60
if not is_open:
closeIgnoringError(producer)
log("Consumer thread stopping")
class Item(object):
def __init__(self, mode, name, data):
self.atime = self.mtime = self.ctime = time.time()
self.data = data
self.name = name
self.mode = mode
def fill_stat(self, stat):
stat.st_mode = self.mode
stat.st_ino = 0
stat.st_dev = 0
stat.st_nlink = 1
stat.st_uid = os.getuid()
stat.st_gid = os.getgid()
stat.st_size = len(self.data)
stat.st_atime = self.atime
stat.st_mtime = self.mtime
stat.st_ctime = self.ctime
return stat
def set_data(self, data):
self.data = data
self.mtime = time.time()
class Log(Item):
def __init__(self):
Item.__init__(self, FILE, "log", "")
def log_message(self, message):
self.set_data(self.data + message + "\n")
class Reading(Item):
def __init__(self, name, data, ts):
Item.__init__(self, FILE, name, data)
self.atime = self.mtime = self.ctime = ts
class Filesystem(Fuse, Item):
def __init__(self, *args, **kw):
self._lock = threading.Lock()
self._files = {}
self._projected = []
self._log = Log()
Fuse.__init__(self, *args, **kw)
Item.__init__(self, DIR, "/", [])
self.add_file(self._log)
# Default options
self.port = SEROPTS["port"]
def add_file(self, file):
self._files["/" + file.name] = file
def remove_file(self, name):
del self._files["/" + name]
def find_item(self, path):
if path == "/":
return self
with self._lock:
if not path in self._files:
return None
return self._files[path]
def log_message(self, message):
# Don't care about threading issues for now
self._log.log_message(message)
def _read_projections(self):
ret = {}
if not self.projections:
return ret
if not os.path.exists(self.projections):
if not self._logged_missing_projections:
self.log_message("Cannot find projections file: " + self.projections)
self._logged_missing_projections = True
return ret
with open(self.projections, "r") as f:
for line in f:
projection = line.strip()
if len(projection) > 0:
name, calc = projection.split("=")
ret[name] = calc
return ret
def _clear_projected(self):
while len(self._projected) > 0:
p = self._projected.pop()
self.remove_file(p)
def add_reading(self, data):
ts = time.time()
projections = self._read_projections()
with self._lock:
values = {}
for idx, val in enumerate(data):
values["f" + str(idx + 1)] = int(val)
r = Reading(".f" + str(idx + 1), val, ts)
self.add_file(r)
self._clear_projected()
for name, calc in projections.iteritems():
try:
val = eval(calc, {}, values)
except Exception, err:
self.log_message("Projection %s failed: %s" % (calc, str(err)))
r = Reading(name, str(val), ts)
self.add_file(r)
self._projected.append(name)
def getattr(self, path):
item = self.find_item(path)
if not item:
return -errno.ENOENT
return item.fill_stat(fuse.Stat())
def readdir(self, path, offset):
with self._lock:
for _, f in self._files.iteritems():
yield fuse.Direntry(f.name)
def read(self, path, length, offset):
item = self.find_item(path)
if item:
return item.data[offset:offset+length]
return ""
def readlink(self, path):
return -errno.ENOENT
def fsinit(self):
log = self.log_message
cb = self.add_reading
self.done = threading.Event()
self.reader_thread = t = threading.Thread(target=reader, args=(log, self.producer_class(*self.producer_args), cb, self.done))
t.start()
def fsdestroy(self):
self.done.set()
self.reader_thread.join()
class Ivt490(object):
def __init__(self, port):
self.port = port
def open(self, messages):
opts = copy.copy(SEROPTS)
opts["port"] = self.port
messages.append("Using serial port options %s" % (opts, ))
self.ser = serial.Serial(**opts)
def get(self):
line = self.ser.readline()
if len(line) > 0 and line[0] != "\x00":
csv = ";".join([field.strip() for field in line.rstrip().split(";")])
return csv
return None
def close(self):
if hasattr(self, "ser"):
self.ser.close()
def main():
global running
usage = """
Extracts data from an IVT490 heat pump and publishes readings in a FUSE file system.
""" + Fuse.fusage
server = Filesystem(version="%prog " + fuse.__version__, usage=usage)
server.log_message("Main program starting")
server.parser.add_option(mountopt="port", metavar="DEVICE", default=server.port,
help="Serial port to read data from [default: %default]")
server.parser.add_option(mountopt="projections", metavar="FILE", default=None,
help="File to read projections from [default: %default]")
server.parse(values=server, errex=1)
if server.projections:
server.projections = os.path.abspath(server.projections)
server.producer_class = Ivt490
server.producer_args = [server.port]
try:
server.main()
except Exception, e:
print "An error occurred: " + str(e)
if __name__ == '__main__':
main()