Decimate seems to work pretty well right now

Makefile

@@ -1,3 +1,9 @@
+test:
+	nilmtool remove /lees-compressor/noleak/raw~4 -s 2000 -e 2020
+	nilmtool remove /lees-compressor/noleak/raw~16	 -s 2000 -e 2020
+	python nilmtools/decimate.py -s '2013-02-04 18:10:00' -e '2013-02-04 18:11:00' /lees-compressor/noleak/raw /lees-compressor/noleak/raw~4
+	python nilmtools/decimate.py -s '2013-02-04 18:10:00' -e '2013-02-04 18:11:00' /lees-compressor/noleak/raw~4 /lees-compressor/noleak/raw~16
+
 all:
 	@echo "Try 'make install'"
 

nilmtools/decimate.py

@@ -0,0 +1,70 @@
+#!/usr/bin/python
+
+import nilmtools.filter
+import nilmdb.client
+import numpy as np
+
+def main():
+    f = nilmtools.filter.Filter()
+    parser = f.setup_parser("Decimate a stream")
+    group = parser.add_argument_group("Decimate options")
+    group.add_argument('-f', '--factor', action='store', default=4, type=int,
+                       help='Decimation factor (default: %(default)s)')
+    # Parse arguments
+    try:
+        args = f.parse_args()
+    except nilmtools.filter.MissingDestination as e:
+        # If no destination, suggest how to create it by figuring out
+        # a recommended layout.
+        print "Source is %s (%s)" % (e.src, e.layout)
+        print "Destination %s doesn't exist" % (e.dest)
+        if "decimate_source" in f.client.stream_get_metadata(e.src):
+            rec = e.layout
+        elif 'int32' in e.layout_type or 'float64' in e.layout_type:
+            rec = 'float64_' + str(e.layout_count * 3)
+        else:
+            rec = 'float32_' + str(e.layout_count * 3)
+        print "You could make it with a command like:"
+        print "  nilmtool create", e.dest, rec
+        raise SystemExit(1)
+
+    f.check_dest_metadata({ "decimate_source": args.srcpath,
+                            "decimate_factor": args.factor })
+
+    # If source is decimated, we have to decimate a bit differently
+    if "decimate_source" in f.client.stream_get_metadata(args.srcpath):
+        f.process(function = decimate_again, rows = args.factor)
+    else:
+        f.process(function = decimate_first, rows = args.factor)
+
+def decimate_first(data):
+    """Decimate original data -- result has 3 times as many columns"""
+    data = np.array(data)
+    rows, cols = data.shape
+    n = cols - 1
+    out = np.zeros(1 + 3 * n)
+
+    out[0] = np.mean(data[:, 0], 0)
+    out[    1 : n+1  ] = np.mean(data[:, 1 : n+1], 0)
+    out[  n+1 : 2*n+1] = np.min( data[:, 1 : n+1], 0)
+    out[2*n+1 : 3*n+1] = np.max( data[:, 1 : n+1], 0)
+
+    return [out]
+
+def decimate_again(data):
+    """Decimate already-decimated data -- result has the same number
+    of columns"""
+    data = np.array(data)
+    rows, cols = data.shape
+    n = (cols - 1) // 3
+    out = np.zeros(1 + 3 * n)
+
+    out[0] = np.mean(data[:, 0], 0)
+    out[    1 : n+1  ] = np.mean(data[:,     1 :   n+1], 0)
+    out[  n+1 : 2*n+1] = np.min( data[:,   n+1 : 2*n+1], 0)
+    out[2*n+1 : 3*n+1] = np.max( data[:, 2*n+1 : 3*n+1], 0)
+
+    return [out]
+
+if __name__ == "__main__":
+    main()

nilmtools/filter.py

@@ -4,63 +4,217 @@ import nilmdb.client
 from nilmdb.utils.printf import *
 from nilmdb.utils.time import parse_time, format_time
 
+import nilmtools
+
+import itertools
 import time
 import sys
 import re
 import argparse
 
+class MissingDestination(Exception):
+    def __init__(self, src, layout, dest):
+        self.src = src
+        self.layout = layout
+        self.layout_type = layout.split('_')[0]
+        self.layout_count = int(layout.split('_')[1])
+        self.dest = dest
+        Exception.__init__(self, "destination path " + dest + " not found")
+
 class Filter(object):
 
-    def __init__(self, description = "Filter data"):
-        self.args = None
+    def __init__(self):
+        self._parser = None
+        self._args = None
         self._client = None
-        self.parse_args(description)
+        self._using_client = False
+        self.srcinfo = None
+        self.destinfo = None
 
-    def parse_args(self, description):
+    @property
+    def client(self):
+        if self._using_client:
+            raise Exception("Filter client is in use; make another")
+        return self._client
+
+    def setup_parser(self, description = "Filter data"):
         parser = argparse.ArgumentParser(
-            description = description,
-            formatter_class = argparse.RawDescriptionHelpFormatter)
-        parser.add_argument("-u", "--url", action="store",
-                            default="http://localhost:12380/",
-                            help="Server URL (default: %(default)s)")
-        parser.add_argument("srcpath", action="store",
-                            help="Path of source stream, e.g. /foo/bar")
-        parser.add_argument("destpath", action="store",
-                            help="Path of destination stream, e.g. /foo/bar")
-        self.args = parser.parse_args()
+            formatter_class = argparse.RawDescriptionHelpFormatter,
+            version = nilmtools.__version__,
+            description = description)
+        group = parser.add_argument_group("General filter arguments")
+        group.add_argument("-u", "--url", action="store",
+                           default="http://localhost:12380/",
+                           help="Server URL (default: %(default)s)")
+        group.add_argument("-D", "--dry-run", action="store_true",
+                           default = False,
+                           help="Just print intervals that would be "
+                           "processed")
+        group.add_argument("-s", "--start",
+                           metavar="TIME", type=self.arg_time,
+                           help="Starting timestamp for intervals "
+                           "(free-form, inclusive)")
+        group.add_argument("-e", "--end",
+                           metavar="TIME", type=self.arg_time,
+                           help="Ending timestamp for intervals "
+                           "(free-form, noninclusive)")
+        group.add_argument("srcpath", action="store",
+                           help="Path of source stream, e.g. /foo/bar")
+        group.add_argument("destpath", action="store",
+                           help="Path of destination stream, e.g. /foo/bar")
+        self._parser = parser
+        return parser
 
+    def parse_args(self):
+        args = self._parser.parse_args()
+        self._args = args
         self._client = nilmdb.client.Client(args.url)
 
         if args.srcpath == args.destpath:
             raise Exception("source and destination path must be different")
 
         # Open and print info about the streams
-        def stream_info_string(info):
-            return sprintf("%s (%s), %.2fM rows, %.2f hours\n",
-                           info[0], info[1], info[4] / 1e6, info[5] / 3600)
-
         src = self._client.stream_list(args.srcpath, extended = True)
         if len(src) != 1:
             raise Exception("source path " + args.srcpath + " not found")
-        print "Source:", stream_info_string(src[0])
+        self.srcinfo = src[0]
 
         dest = self._client.stream_list(args.destpath, extended = True)
         if len(dest) != 1:
-            raise Exception("destination path " + args.destpath + " not found")
-        print "  Dest:", stream_info_string(dest[0])
+            raise MissingDestination(self.srcinfo[0], self.srcinfo[1],
+                                     args.destpath)
+        self.destinfo = dest[0]
+
+        print "Source:", self.stream_info_string(self.srcinfo)
+        print "  Dest:", self.stream_info_string(self.destinfo)
+
+        if args.dry_run:
+            for interval in self.intervals():
+                print self.interval_string(interval)
+            raise SystemExit(0)
+
+        return args
 
     def intervals(self):
         """Generate all the intervals that this filter should process"""
+        self._using_client = True
         for i in self._client.stream_intervals(
-            args.srcpath, diffpath = args.destpath):
+            self._args.srcpath, diffpath = self._args.destpath,
+            start = self._args.start, end = self._args.end):
             yield i
+        self._using_client = False
+
+    # Misc helpers
+    def arg_time(self, toparse):
+        """Parse a time string argument"""
+        try:
+            return nilmdb.utils.time.parse_time(toparse).totimestamp()
+        except ValueError as e:
+            raise argparse.ArgumentTypeError(sprintf("%s \"%s\"",
+                                                     str(e), toparse))
+
+    def stream_info_string(self, info):
+        """Print stream info as a string"""
+        return sprintf("%s (%s), %.2fM rows, %.2f hours",
+                       info[0], info[1], info[4] / 1e6, info[5] / 3600)
+
+    def interval_string(self, interval):
+        """Print interval as a string"""
+        return sprintf("[ %s -> %s ]", format_time(interval[0]),
+                       format_time(interval[1]))
+
+    def check_dest_metadata(self, data):
+        """See if the metadata jives, and complain if it doesn't.  If
+        there's no conflict, update the metadata to match 'data'."""
+        metadata = self._client.stream_get_metadata(self._args.destpath)
+        rows = self.destinfo[4]
+        for key in data:
+            wanted = str(data[key])
+            val = metadata.get(key, wanted)
+            if val != wanted and rows > 0:
+                m =  "Metadata in destination stream:\n"
+                m += "  %s = %s\n" % (key, val)
+                m += "doesn't match desired data:\n"
+                m += "  %s = %s\n" % (key, wanted)
+                m += "Refusing to change it.  You can change the stream's "
+                m += "metadata manually, or\n"
+                m += "remove existing data from the stream, to prevent "
+                m += "this error.\n"
+                raise Exception(m)
+        # All good -- write the metadata in case it's not already there
+        self._client.stream_update_metadata(self._args.destpath, data)
+
+    # Main processing helper
+    def process(self, function, rows, partial = True, args = None):
+        """Process data in chunks of 'rows' data at a time.
+
+        function: function to process the data
+        rows: maximum number of rows to pass to 'function' at once
+        args: tuple containing extra arguments to pass to 'function'
+        partial: if true, less than 'rows' may be passed to 'function'.
+                 if false, partial data at the end of an interval will
+                 be dropped.
+
+        'function' should be defined like:
+            function(data, *args)
+        It will be passed an array containing up to 'rows' rows of
+        data from the source stream, and any arguments passed in
+        'args'.  It should transform the data as desired, and return a
+        new array of data, which will be inserted into the destination
+        stream.
+        """
+        if args is None:
+            args = []
+        extractor = nilmdb.client.Client(self._args.url).stream_extract
+        inserter = nilmdb.client.Client(self._args.url).stream_insert_context
+        src = self._args.srcpath
+        dest = self._args.destpath
+        islice = itertools.islice
+
+        # Figure out how to format output data
+        dest_layout = self.destinfo[1].split('_')[1]
+        def int_formatter(row):
+            return ("%.6f " % row[0]) + " ".join(str(int(x)) for x in row[1:])
+        def float_formatter(row):
+            return ("%.6f " % row[0]) + " ".join(repr(x) for x in row[1:])
+        if "int" in dest_layout:
+            formatter = int_formatter
+        else:
+            formatter = float_formatter
+
+        for (start, end) in self.intervals():
+            print "Processing", self.interval_string((start, end))
+            with inserter(dest, start, end) as insert_ctx:
+                src_array = []
+                for line in extractor(src, start, end):
+                    # Read in data
+                    src_array.append([ float(x) for x in line.split() ])
+
+                    if len(src_array) == rows:
+                        # Pass through filter function
+                        dest_array = function(src_array, *args)
+
+                        # Write result to destination
+                        out = [ formatter(row) for row in dest_array ]
+                        insert_ctx.insert("\n".join(out) + "\n")
+
+                        # Clear source array
+                        src_array = []
+
+                # Take care of partial chunk
+                if len(src_array) and partial:
+                    dest_array = function(src_array, *args)
+                    out = [ formatter(row) for row in dest_array ]
+                    insert_ctx.insert("\n".join(out) + "\n")
 
 def main():
     # This is just a dummy function; actual filters can use the other
     # functions to prepare stuff, and then do something with the data.
     f = Filter()
-    for interval in f.intervals():
-        print "Generic filter: need to handle interval:", interval
+    parser = f.setup_parser()
+    args = f.parse_args()
+    for (start, end) in f.intervals():
+        print "Generic filter: need to handle", start, " to ", end
 
 if __name__ == "__main__":
     main()

nilmtools/insert.py

@@ -4,6 +4,7 @@ import nilmdb.client
 from nilmdb.utils.printf import *
 from nilmdb.utils.time import parse_time, format_time
 
+import nilmtools
 import time
 import sys
 import re
@@ -16,7 +17,10 @@ class ParseError(Exception):
         super(ParseError, self).__init__(msg)
 
 def parse_args():
-    parser = argparse.ArgumentParser(description = """\
+    parser = argparse.ArgumentParser(
+        formatter_class = argparse.RawDescriptionHelpFormatter,
+        version = nilmtools.__version__,
+        description = """\
     Insert data from ethstream, either live (using the system time as a
     reference) or prerecorded (using comments in the file as a reference).
 
@@ -24,18 +28,20 @@ def parse_args():
     Small discrepencies between the accumulated timestamps and the
     reference time are ignored; larger discrepencies cause gaps to be
     created in the stream.  Overlapping data returns an error.
-    """, formatter_class = argparse.RawDescriptionHelpFormatter)
+    """)
     parser.add_argument("-u", "--url", action="store",
                         default="http://localhost:12380/",
                         help="NilmDB server URL (default: %(default)s)")
-    parser.add_argument("-r", "--rate", action="store", default=8000, type=float,
+    parser.add_argument("-r", "--rate", action="store", default=8000,
+                        type=float,
                         help="Data rate in Hz (default: %(default)s)")
     parser.add_argument("-l", "--live", action="store_true",
                         help="Live capture; use system time to verify rate")
     parser.add_argument("path", action="store",
                         help="Path of stream, e.g. /foo/bar")
     parser.add_argument("infile", type=argparse.FileType('r'), nargs='*',
-                        default=[sys.stdin], help="Input files (default: stdin)")
+                        default=[sys.stdin],
+                        help="Input files (default: stdin)")
     args = parser.parse_args()
 
     printf("Stream path: %s\n", args.path)