Fix daemon dependency

If the max scale in the exemplar was a column we weren't using, it
would bail out when looking for that correlation later.  Change things
around so exemplars in RAM only keep around the columns we care about.

Makefile

@@ -8,13 +8,20 @@ else
 	@echo "Try 'make install'"
 endif
 
-test: test_trainola
+test: test_pipewatch
+
+test_pipewatch:
+	nilmtools/pipewatch.py -t 3 "seq 10 20" "seq 20 30"
 
 test_trainola:
+	-nilmtool -u http://bucket/nilmdb remove -s min -e max \
+		/sharon/prep-a-matches
+	nilmtools/trainola.py "$$(cat extras/trainola-test-param-2.js)"
 	-nilmtool -u http://bucket/nilmdb remove -s min -e max \
 		/sharon/prep-a-matches
 	nilmtools/trainola.py "$$(cat extras/trainola-test-param.js)"
 
+
 test_cleanup:
 	nilmtools/cleanup.py -e extras/cleanup.cfg
 	nilmtools/cleanup.py extras/cleanup.cfg

README.txt

@@ -5,8 +5,8 @@ by Jim Paris <jim@jtan.com>
 Prerequisites:
 
   # Runtime and build environments
-  sudo apt-get install python2.7 python2.7-dev python-setuptools python-pip
-  sudo apt-get install python-numpy python-scipy
+  sudo apt-get install python2.7 python2.7-dev python-setuptools
+  sudo apt-get install python-numpy python-scipy python-daemon
 
   nilmdb (1.8.1+)
 

extras/trainola-test-param-2.js

@@ -0,0 +1,29 @@
+{ "columns" : [ { "index" : 0, "name" : "P1" },
+                { "index" : 1, "name" : "Q1" },
+                { "index" : 2, "name" : "P3" } ],
+  "stream" : "/sharon/prep-a",
+  "url" : "http://bucket.mit.edu/nilmdb",
+  "dest_stream" : "/sharon/prep-a-matches",
+  "start" : 1365153062643133.5,
+  "end"   : 1365168814443575.5,
+  "exemplars" : [ { "columns" : [ { "index" : 0,
+                                    "name" : "P1"
+                                  } ],
+                    "dest_column" : 0,
+                    "end" : 1365073657682000,
+                    "name" : "Turn ON",
+                    "start" : 1365073654321000,
+                    "stream" : "/sharon/prep-a",
+                    "url" : "http://bucket.mit.edu/nilmdb"
+                  },
+                  { "columns" : [ { "index" : 2, "name" : "P3" },
+                                  { "index" : 0, "name" : "P1" } ],
+                    "dest_column" : 1,
+                    "end" : 1365176528818000,
+                    "name" : "Type 2 turn ON",
+                    "start" : 1365176520030000,
+                    "stream" : "/sharon/prep-a",
+                    "url" : "http://bucket.mit.edu/nilmdb"
+                  }
+                ]
+}

nilmtools/pipewatch.py

@@ -0,0 +1,168 @@
+#!/usr/bin/python
+
+import nilmdb.client
+from nilmdb.utils.printf import *
+import nilmdb.utils.lock
+import nilmtools
+
+import time
+import sys
+import os
+import argparse
+import subprocess
+import tempfile
+import threading
+import select
+import signal
+import Queue
+import daemon
+
+def parse_args(argv = None):
+    parser = argparse.ArgumentParser(
+        formatter_class = argparse.ArgumentDefaultsHelpFormatter,
+        version = nilmtools.__version__,
+        description = """\
+    Pipe data from 'generator' to 'consumer'.  This is intended to be
+    executed frequently from cron, and will exit if another copy is
+    already running.  If 'generator' or 'consumer' returns an error,
+    or if 'generator' stops sending data for a while, it will exit.
+
+    Intended for use with ethstream (generator) and nilm-insert
+    (consumer).  Commands are executed through the shell.
+    """)
+    parser.add_argument("-d", "--daemon", action="store_true",
+                        help="Run in background")
+    parser.add_argument("-l", "--lock", metavar="FILENAME", action="store",
+                        default=tempfile.gettempdir() +
+                        "/nilm-pipewatch.lock",
+                        help="Lock file for detecting running instance")
+    parser.add_argument("-t", "--timeout", metavar="SECONDS", action="store",
+                        type=float, default=30,
+                        help="Restart if no output from " +
+                        "generator for this long")
+    group = parser.add_argument_group("commands to execute")
+    group.add_argument("generator", action="store",
+                       help="Data generator (e.g. \"ethstream -r 8000\")")
+    group.add_argument("consumer", action="store",
+                       help="Data consumer (e.g. \"nilm-insert /foo/bar\")")
+    args = parser.parse_args(argv)
+
+    return args
+
+def reader_thread(queue, fd):
+    # Read from a file descriptor, write to queue.
+    try:
+        while True:
+            (r, w, x) = select.select([fd], [], [fd], 0.25)
+            if x:
+                raise Exception # generator died?
+            if not r:
+                # short timeout -- just try again.  This is to catch the
+                # fd being closed elsewhere, which is only detected
+                # when select restarts.
+                continue
+            data = os.read(fd, 65536)
+            if data == "": # generator EOF
+                raise Exception
+            queue.put(data)
+    except Exception:
+        queue.put(None)
+
+def watcher_thread(queue, procs):
+    # Put None in the queue if either process dies
+    while True:
+        for p in procs:
+            if p.poll() is not None:
+                queue.put(None)
+                return
+        time.sleep(0.25)
+
+def pipewatch(args):
+    # Run the processes, etc
+    with open(os.devnull, "r") as devnull:
+        generator = subprocess.Popen(args.generator, shell = True,
+                                     bufsize = -1, close_fds = True,
+                                     stdin = devnull,
+                                     stdout = subprocess.PIPE,
+                                     stderr = None)
+        consumer = subprocess.Popen(args.consumer, shell = True,
+                                    bufsize = -11, close_fds = True,
+                                    stdin = subprocess.PIPE,
+                                    stdout = None, stderr = None)
+
+        queue = Queue.Queue(maxsize = 32)
+        reader = threading.Thread(target = reader_thread,
+                                  args = (queue, generator.stdout.fileno()))
+        reader.start()
+        watcher = threading.Thread(target = watcher_thread,
+                                   args = (queue, [generator, consumer]))
+        watcher.start()
+        try:
+            while True:
+                try:
+                    data = queue.get(True, args.timeout)
+                    if data is None:
+                        break
+                    consumer.stdin.write(data)
+                except Queue.Empty:
+                    # Timeout: kill the generator
+                    fprintf(sys.stderr, "pipewatch: timeout\n")
+                    generator.terminate()
+                    break
+
+            generator.stdout.close()
+            consumer.stdin.close()
+        except IOError:
+            fprintf(sys.stderr, "pipewatch: I/O error\n")
+
+        def kill(proc):
+            # Wait for a process to end, or kill it
+            def poll_timeout(proc, timeout):
+                for x in range(1+int(timeout / 0.1)):
+                    if proc.poll() is not None:
+                        break
+                    time.sleep(0.1)
+                return proc.poll()
+            try:
+                if poll_timeout(proc, 0.5) is None:
+                    proc.terminate()
+                    if poll_timeout(proc, 0.5) is None:
+                        proc.kill()
+            except OSError:
+                pass
+            return poll_timeout(proc, 0.5)
+
+        # Wait for them to die, or kill them
+        gret = kill(generator)
+        cret = kill(consumer)
+
+        fprintf(sys.stderr, "pipewatch: generator returned %d, " +
+                "consumer returned %d\n", gret, cret)
+        if gret == 0 and cret == 0:
+            sys.exit(0)
+        sys.exit(1)
+
+def main(argv = None):
+    args = parse_args(argv)
+
+    lockfile = open(args.lock, "w")
+    if not nilmdb.utils.lock.exclusive_lock(lockfile):
+        printf("pipewatch process already running (according to %s)\n",
+               args.lock)
+        sys.exit(0)
+    try:
+        # Run as a daemon if requested, otherwise run directly.
+        if args.daemon:
+            with daemon.DaemonContext(files_preserve = [ lockfile ]):
+                pipewatch(args)
+        else:
+            pipewatch(args)
+    finally:
+        # Clean up lockfile
+        try:
+            os.unlink(args.lock)
+        except OSError:
+            pass
+
+if __name__ == "__main__":
+    main()

nilmtools/trainola.py

@@ -28,12 +28,12 @@ def build_column_mapping(colinfo, streaminfo):
     pull out a dictionary mapping for the column names/numbers."""
     columns = OrderedDict()
     for c in colinfo:
-        if (c['name'] in columns.keys() or
-            c['index'] in columns.values()):
+        col_num = c['index'] + 1  # skip timestamp
+        if (c['name'] in columns.keys() or col_num in columns.values()):
             raise DataError("duplicated columns")
         if (c['index'] < 0 or c['index'] >= streaminfo.layout_count):
             raise DataError("bad column number")
-        columns[c['name']] = c['index']
+        columns[c['name']] = col_num
     if not len(columns):
         raise DataError("no columns")
     return columns
@@ -79,10 +79,17 @@ class Exemplar(object):
                                                    maxrows = self.count)
         self.data = list(datagen)[0]
 
-        # Discard timestamp
-        self.data = self.data[:,1:]
+        # Extract just the columns that were specified in self.columns,
+        # skipping the timestamp.
+        extract_columns = [ value for (key, value) in self.columns.items() ]
+        self.data = self.data[:,extract_columns]
 
-        # Subtract the mean from each column
+        # Fix the column indices in e.columns, since we removed/reordered
+        # columns in self.data
+        for n, k in enumerate(self.columns):
+            self.columns[k] = n
+
+        # Subtract the means from each column
         self.data = self.data - self.data.mean(axis=0)
 
         # Get scale factors for each column by computing dot product
@@ -147,7 +154,7 @@ def trainola_matcher(data, interval, args, insert_func, final_chunk):
 
         # Compute cross-correlation for each column
         for col_name in e.columns:
-            a = data[:, src_columns[col_name] + 1]
+            a = data[:, src_columns[col_name]]
             b = e.data[:, e.columns[col_name]]
             corr = scipy.signal.fftconvolve(a, np.flipud(b), 'valid')[0:valid]
 

setup.py

@@ -64,6 +64,7 @@ setup(name='nilmtools',
       install_requires = [ 'nilmdb >= 1.8.1',
                            'numpy',
                            'scipy',
+                           'python-daemon >= 1.5',
                            #'matplotlib',
                            ],
       packages = [ 'nilmtools',
@@ -80,6 +81,7 @@ setup(name='nilmtools',
               'nilm-cleanup = nilmtools.cleanup:main',
               'nilm-median = nilmtools.median:main',
               'nilm-trainola = nilmtools.trainola:main',
+              'nilm-pipewatch = nilmtools.pipewatch:main',
               ],
           },
       zip_safe = False,