Merge branch 'timestamp-integers'

docs/design.md

@@ -140,7 +140,7 @@ Speed
 
 - Next slowdown target is nilmdb.layout.Parser.parse().
     - Rewrote parsers using cython and sscanf
-    - Stats (rev 10831), with _add_interval disabled
+    - Stats (rev 10831), with `_add_interval` disabled
 
         layout.pyx.Parser.parse:128        6303 sec, 262k calls
          layout.pyx.parse:63               13913 sec, 5.1g calls
@@ -328,3 +328,51 @@ Current places where we use lines:
   - Finished.  Just a single insert() that takes any length string and
     does very little processing until it's time to send it to the
 	server.
+
+Timestamps
+----------
+
+Timestamps are currently double-precision floats (64 bit).  Since the
+mantissa is 53-bit, this can only represent about 15-17 significant
+figures, and microsecond Unix timestamps like 1222333444.000111 are
+already 16 significant figures.  Rounding is therefore an issue;
+it's hard to sure that converting from ASCII, then back to ASCII,
+will always give the same result.
+
+Also, if the client provides a floating point value like 1.9999999999,
+we need to be careful that we don't store it as 1.9999999999 but later
+print it as 2.000000, because then round-trips change the data.
+
+Possible solutions:
+
+- When the client provides a floating point value to the server,
+  always round to the 6th decimal digit before verifying & storing.
+  Good for compatibility and simplicity.  But still might have rounding
+  issues, and clients will also need to round when doing their own
+  verification.  Having every piece of code need to know which digit
+  to round at is not ideal.
+
+- Always store int64 timestamps on the server, representing
+  microseconds since epoch.  int64 timestamps are used in all HTTP
+  parameters, in insert/extract ASCII strings, client API, commandline
+  raw timestamps, etc.  Pretty big change.
+
+  This is what we'll go with...
+
+  - Client programs that interpret the timestamps as doubles instead
+    of ints will remain accurate until 2^53 microseconds, or year
+    2255.
+
+  - On insert, maybe it's OK to send floating point microsecond values
+    (1234567890123456.0), just to cope with clients that want to print
+    everything as a double.  Server could try parsing as int64, and if
+    that fails, parse as double and truncate to int64.  However, this
+    wouldn't catch imprecise inputs like "1.23456789012e+15".  But
+    maybe that can just be ignored; it's likely to cause a
+    non-monotonic error at the client.
+
+  - Timestamps like 1234567890.123456 never show up anywhere, except
+    for interfacing to datetime_tz etc.  Command line "raw timestamps"
+    are always printed as int64 values, and a new format
+    "@1234567890123456" is added to the parser for specifying them
+    exactly.

nilmdb/client/client.py

@@ -10,11 +10,11 @@ import time
 import simplejson as json
 import contextlib
 
-from nilmdb.utils.time import float_time_to_string
+from nilmdb.utils.time import timestamp_to_string, string_to_timestamp
 
 def extract_timestamp(line):
     """Extract just the timestamp from a line of data text"""
-    return float(line.split()[0])
+    return string_to_timestamp(line.split()[0])
 
 class Client(object):
     """Main client interface to the Nilm database."""
@@ -113,9 +113,9 @@ class Client(object):
             "path": path
         }
         if start is not None:
-            params["start"] = float_time_to_string(start)
+            params["start"] = timestamp_to_string(start)
         if end is not None:
-            params["end"] = float_time_to_string(end)
+            params["end"] = timestamp_to_string(end)
         return self.http.post("stream/remove", params)
 
     @contextlib.contextmanager
@@ -166,9 +166,9 @@ class Client(object):
         if diffpath is not None:
             params["diffpath"] = diffpath
         if start is not None:
-            params["start"] = float_time_to_string(start)
+            params["start"] = timestamp_to_string(start)
         if end is not None:
-            params["end"] = float_time_to_string(end)
+            params["end"] = timestamp_to_string(end)
         return self.http.get_gen("stream/intervals", params)
 
     def stream_extract(self, path, start = None, end = None, count = False):
@@ -184,9 +184,9 @@ class Client(object):
             "path": path,
         }
         if start is not None:
-            params["start"] = float_time_to_string(start)
+            params["start"] = timestamp_to_string(start)
         if end is not None:
-            params["end"] = float_time_to_string(end)
+            params["end"] = timestamp_to_string(end)
         if count:
             params["count"] = 1
         return self.http.get_gen("stream/extract", params)
@@ -238,9 +238,6 @@ class StreamInserter(object):
     _max_data = 2 * 1024 * 1024
     _max_data_after_send = 64 * 1024
 
-    # Delta to add to the final timestamp, if "end" wasn't given
-    _end_epsilon = 1e-6
-
     def __init__(self, http, path, start = None, end = None):
         """'http' is the httpclient object.  'path' is the database
         path to insert to.  'start' and 'end' are used for the first
@@ -364,7 +361,7 @@ class StreamInserter(object):
                 if end_ts is None:
                     (spos, epos) = self._get_last_noncomment(block)
                     end_ts = extract_timestamp(block[spos:epos])
-                    end_ts += self._end_epsilon
+                    end_ts += nilmdb.utils.time.epsilon
             except (ValueError, IndexError):
                 pass # no timestamp is OK, if we have no data
             self._block_data = []
@@ -411,8 +408,8 @@ class StreamInserter(object):
 
         # Send it
         params = { "path": self._path,
-                   "start": float_time_to_string(start_ts),
-                   "end": float_time_to_string(end_ts) }
+                   "start": timestamp_to_string(start_ts),
+                   "end": timestamp_to_string(end_ts) }
         self.last_response = self._http.put("stream/insert", block, params)
 
         return

nilmdb/cmdline/cmdline.py

@@ -88,7 +88,7 @@ class Cmdline(object):
     def arg_time(self, toparse):
         """Parse a time string argument"""
         try:
-            return nilmdb.utils.time.parse_time(toparse).totimestamp()
+            return nilmdb.utils.time.parse_time(toparse)
         except ValueError as e:
             raise argparse.ArgumentTypeError(sprintf("%s \"%s\"",
                                                      str(e), toparse))

nilmdb/cmdline/extract.py

@@ -47,9 +47,9 @@ def cmd_extract(self):
     layout = streams[0][1]
 
     if self.args.timestamp_raw:
-        time_string = nilmdb.utils.time.float_time_to_string
+        time_string = nilmdb.utils.time.timestamp_to_string
     else:
-        time_string = nilmdb.utils.time.format_time
+        time_string = nilmdb.utils.time.timestamp_to_human
 
     if self.args.annotate:
         printf("# path: %s\n", self.args.path)

nilmdb/cmdline/insert.py

@@ -96,7 +96,7 @@ def cmd_insert(self):
 
         if arg.start is None:
             try:
-                arg.start = nilmdb.utils.time.parse_time(filename).totimestamp()
+                arg.start = nilmdb.utils.time.parse_time(filename)
             except ValueError:
                 self.die("error extracting start time from filename '%s'",
                          filename)
@@ -110,10 +110,10 @@ def cmd_insert(self):
         if not arg.quiet:
             printf(" Input file: %s\n", filename)
             printf(" Start time: %s\n",
-                   nilmdb.utils.time.format_time(arg.start))
+                   nilmdb.utils.time.timestamp_to_human(arg.start))
             if arg.end:
                 printf("   End time: %s\n",
-                       nilmdb.utils.time.format_time(arg.end))
+                       nilmdb.utils.time.timestamp_to_human(arg.end))
             if arg.timestamp:
                 printf("Timestamper: %s\n", str(data))
 

nilmdb/cmdline/intervals.py

@@ -53,9 +53,9 @@ def cmd_intervals_verify(self):
 def cmd_intervals(self):
     """List intervals in a stream"""
     if self.args.timestamp_raw:
-        time_string = nilmdb.utils.time.float_time_to_string
+        time_string = nilmdb.utils.time.timestamp_to_string
     else:
-        time_string = nilmdb.utils.time.format_time
+        time_string = nilmdb.utils.time.timestamp_to_human
 
     try:
            for (start, end) in self.client.stream_intervals(

nilmdb/cmdline/list.py

@@ -76,12 +76,12 @@ def cmd_list(self):
     streams = self.client.stream_list(extended = True)
 
     if self.args.timestamp_raw:
-        time_string = nilmdb.utils.time.float_time_to_string
+        time_string = nilmdb.utils.time.timestamp_to_string
     else:
-        time_string = nilmdb.utils.time.format_time
+        time_string = nilmdb.utils.time.timestamp_to_human
 
     for stream in streams:
-        (path, layout, int_min, int_max, rows, seconds) = stream[:6]
+        (path, layout, int_min, int_max, rows, time) = stream[:6]
         if not (fnmatch.fnmatch(path, self.args.path) and
                 fnmatch.fnmatch(layout, self.args.layout)):
             continue
@@ -95,7 +95,8 @@ def cmd_list(self):
                 printf("  interval extents: %s -> %s\n",
                        time_string(int_min), time_string(int_max))
             printf("        total data: %d rows, %.6f seconds\n",
-                   rows or 0, seconds or 0);
+                   rows or 0,
+                   nilmdb.utils.time.timestamp_to_seconds(time or 0))
 
         if self.args.detail:
             printed = False

nilmdb/server/bulkdata.py

@@ -5,7 +5,7 @@
 from __future__ import absolute_import
 from __future__ import division
 from nilmdb.utils.printf import *
-from nilmdb.utils.time import float_time_to_string as ftts
+from nilmdb.utils.time import timestamp_to_string as timestamp_to_string
 import nilmdb.utils
 
 import os
@@ -260,7 +260,7 @@ class Table(object):
         fmt = { "rows_per_file": rows_per_file,
                 "files_per_dir": files_per_dir,
                 "layout": layout,
-                "version": 2 }
+                "version": 3 }
         with open(os.path.join(root, "_format"), "wb") as f:
             pickle.dump(fmt, f, 2)
 
@@ -273,21 +273,11 @@ class Table(object):
         with open(os.path.join(self.root, "_format"), "rb") as f:
             fmt = pickle.load(f)
 
-        if fmt["version"] == 1: # pragma: no cover
-            # We can handle this old version by converting from
-            # struct_fmt back to layout name.
-            compat = { "<dHHHHHH": "uint16_6",
-                       "<dHHHHHHHHH": "uint16_9",
-                       "<dffffffff": "float32_8" }
-            if fmt["struct_fmt"] in compat:
-                fmt["version"] = 2
-                fmt["layout"] = compat[fmt["struct_fmt"]]
-            else:
-                raise NotImplementedError("old version 1 data with format "
-                                          + fmt["struct_fmt"] + " is no good")
-        elif fmt["version"] != 2: # pragma: no cover (just future proofing)
-            raise NotImplementedError("version " + str(fmt["version"]) +
-                                      " bulk data store not supported")
+        if fmt["version"] != 3: # pragma: no cover
+            # Old versions used floating point timestamps, which aren't
+            # valid anymore.
+            raise NotImplementedError("old version " + str(fmt["version"]) +
+                                      " bulk data store is not supported")
 
         self.rows_per_file = fmt["rows_per_file"]
         self.files_per_dir = fmt["files_per_dir"]
@@ -431,7 +421,7 @@ class Table(object):
         the table is reverted back to its original state by truncating
         or deleting files as necessary."""
         data_offset = 0
-        last_timestamp = -1e12
+        last_timestamp = nilmdb.utils.time.min_timestamp
         tot_rows = self.nrows
         count = 0
         linenum = 0
@@ -462,10 +452,12 @@ class Table(object):
                     elif errtype == rocket.ERR_OUT_OF_INTERVAL:
                         if obj < start:
                             err = sprintf("Data timestamp %s < start time %s",
-                                          ftts(obj), ftts(start))
+                                          timestamp_to_string(obj),
+                                          timestamp_to_string(start))
                         else:
                             err = sprintf("Data timestamp %s >= end time %s",
-                                          ftts(obj), ftts(end))
+                                          timestamp_to_string(obj),
+                                          timestamp_to_string(end))
                     else:
                         err = str(obj)
                     raise ValueError("error parsing input data: " +

nilmdb/server/interval.pyx

@@ -19,13 +19,16 @@ Intervals are half-open, ie. they include data points with timestamps
 # Fourth version is an optimized rb-tree that stores interval starts
 # and ends directly in the tree, like bxinterval did.
 
-from ..utils.time import float_time_to_string as ftts
+from ..utils.time import min_timestamp as nilmdb_min_timestamp
+from ..utils.time import max_timestamp as nilmdb_max_timestamp
+from ..utils.time import timestamp_to_string
 from ..utils.iterator import imerge
 import itertools
 
 cimport rbtree
-cdef extern from "stdint.h":
-    ctypedef unsigned long long uint64_t
+from libc.stdint cimport uint64_t, int64_t
+
+ctypedef int64_t timestamp_t
 
 class IntervalError(Exception):
     """Error due to interval overlap, etc"""
@@ -34,24 +37,25 @@ class IntervalError(Exception):
 cdef class Interval:
     """Represents an interval of time."""
 
-    cdef public double start, end
+    cdef public timestamp_t start, end
 
-    def __init__(self, double start, double end):
+    def __init__(self, timestamp_t start, timestamp_t end):
         """
-        'start' and 'end' are arbitrary floats that represent time
+        'start' and 'end' are arbitrary numbers that represent time
         """
         if start >= end:
             # Explicitly disallow zero-width intervals (since they're half-open)
             raise IntervalError("start %s must precede end %s" % (start, end))
-        self.start = float(start)
-        self.end = float(end)
+        self.start = start
+        self.end = end
 
     def __repr__(self):
         s = repr(self.start) + ", " + repr(self.end)
         return self.__class__.__name__ + "(" + s + ")"
 
     def __str__(self):
-        return "[" + ftts(self.start) + " -> " + ftts(self.end) + ")"
+        return ("[" + timestamp_to_string(self.start) +
+                " -> " + timestamp_to_string(self.end) + ")")
 
     def __cmp__(self, Interval other):
         """Compare two intervals.  If non-equal, order by start then end"""
@@ -73,7 +77,7 @@ cdef class Interval:
             return False
         return True
 
-    cpdef subset(self, double start, double end):
+    cpdef subset(self, timestamp_t start, timestamp_t end):
         """Return a new Interval that is a subset of this one"""
         # A subclass that tracks additional data might override this.
         if start < self.start or end > self.end:
@@ -95,14 +99,14 @@ cdef class DBInterval(Interval):
         db_end = 200, db_endpos = 20000
     """
 
-    cpdef public double db_start, db_end
+    cpdef public timestamp_t db_start, db_end
     cpdef public uint64_t db_startpos, db_endpos
 
     def __init__(self, start, end,
                  db_start, db_end,
                  db_startpos, db_endpos):
         """
-        'db_start' and 'db_end' are arbitrary floats that represent
+        'db_start' and 'db_end' are arbitrary numbers that represent
         time.  They must be a strict superset of the time interval
         covered by 'start' and 'end'.  The 'db_startpos' and
         'db_endpos' are arbitrary database position indicators that
@@ -122,7 +126,7 @@ cdef class DBInterval(Interval):
         s += ", " + repr(self.db_startpos) + ", " + repr(self.db_endpos)
         return self.__class__.__name__ + "(" + s + ")"
 
-    cpdef subset(self, double start, double end):
+    cpdef subset(self, timestamp_t start, timestamp_t end):
         """
         Return a new DBInterval that is a subset of this one
         """
@@ -331,7 +335,8 @@ cdef class IntervalSet:
                 yield i.start, key_start, i
                 yield i.end, key_end, i
         if bounds is None:
-            bounds = Interval(-1e12, 1e12)
+            bounds = Interval(nilmdb_min_timestamp,
+                              nilmdb_max_timestamp)
         self_iter = decorate(self.intersection(bounds), 0, 2)
         other_iter = decorate(other.intersection(bounds), 1, 3)
 
@@ -372,7 +377,7 @@ cdef class IntervalSet:
                 return True
         return False
 
-    def find_end(self, double t):
+    def find_end(self, timestamp_t t):
         """
         Return an Interval from this tree that ends at time t, or
         None if it doesn't exist.

nilmdb/server/layout.pyx

@@ -5,6 +5,8 @@ import sys
 import inspect
 import cStringIO
 
+from ..utils.time import min_timestamp as nilmdb_min_timestamp
+
 cdef enum:
     max_value_count = 64
 
@@ -146,7 +148,8 @@ class Parser(object):
         layout, into an internal data structure suitable for a
         pytables 'table.append(parser.data)'.
         """
-        cdef double last_ts = -1e12, ts
+        cdef double last_ts = nilmdb_min_timestamp
+        cdef double ts
         cdef int n = 0, i
         cdef char *line
 

nilmdb/server/nilmdb.py

@@ -135,9 +135,9 @@ class NilmDB(object):
 
     def _check_user_times(self, start, end):
         if start is None:
-            start = -1e12
+            start = nilmdb.utils.time.min_timestamp
         if end is None:
-            end = 1e12
+            end = nilmdb.utils.time.max_timestamp
         if start >= end:
             raise NilmDBError("start must precede end")
         return (start, end)
@@ -284,7 +284,7 @@ class NilmDB(object):
            interval_min (earliest interval start)
            interval_max (latest interval end)
            rows         (total number of rows of data)
-           seconds      (total time covered by this stream)
+           time         (total time covered by this stream, in timestamp units)
         """
         params = ()
         query = "SELECT streams.path, streams.layout"

nilmdb/server/pyrocket.py

@@ -10,7 +10,6 @@ import cStringIO
 import itertools
 from . import layout as _layout
 import nilmdb.utils
-from nilmdb.utils.time import float_time_to_string as ftts
 
 ERR_UNKNOWN = 0
 ERR_NON_MONOTONIC = 1

nilmdb/server/rocket.c

@@ -17,6 +17,13 @@
 #define FLOAT64_MIN 0
 #define FLOAT64_MAX 0
 
+typedef int64_t timestamp_t;
+
+/* This code probably needs to be double-checked for the case
+   where sizeof(long) != 8, so enforce that here with something
+   that will fail at build time. */
+const static char __long_ok[1 - 2*!(sizeof(int64_t) == sizeof(long))] = { 0 };
+
 /* Somewhat arbitrary, just so we can use fixed sizes for strings
    etc. */
 static const int MAX_LAYOUT_COUNT = 128;
@@ -46,10 +53,10 @@ static PyObject *raise_str(int line, int col, int code, const char *string)
 	}
 	return NULL;
 }
-static PyObject *raise_num(int line, int col, int code, double num)
+static PyObject *raise_int(int line, int col, int code, int64_t num)
 {
 	PyObject *o;
-	o = Py_BuildValue("(iiid)", line, col, code, num);
+	o = Py_BuildValue("(iiiL)", line, col, code, num);
 	if (o != NULL) {
 		PyErr_SetObject(ParseError, o);
 		Py_DECREF(o);
@@ -314,7 +321,7 @@ static PyObject *Rocket_append_iter(Rocket *self, PyObject *args)
 
 		/* Extract and write timestamp */
 		append_pyobject(self->file, PyList_GetItem(rowlist, 0),
-				LAYOUT_TYPE_FLOAT64);
+				LAYOUT_TYPE_INT64);
 		if (PyErr_Occurred())
 			goto row_err;
 
@@ -355,9 +362,9 @@ static PyObject *Rocket_append_string(Rocket *self, PyObject *args)
 	int offset;
 	const char *linestart;
 	int linenum;
-	double start;
-	double end;
-	double last_timestamp;
+	timestamp_t start;
+	timestamp_t end;
+	timestamp_t last_timestamp;
 
 	int written = 0;
 	char *endptr;
@@ -371,7 +378,7 @@ static PyObject *Rocket_append_string(Rocket *self, PyObject *args)
 	   but we need the null termination for strto*.  If we had
 	   strnto* that took a length, we could use t# and not require
 	   a copy. */
-	if (!PyArg_ParseTuple(args, "isiiddd:append_string", &count,
+	if (!PyArg_ParseTuple(args, "isiiLLL:append_string", &count,
 			      &data, &offset, &linenum,
 			      &start, &end, &last_timestamp))
 		return NULL;
@@ -401,17 +408,23 @@ static PyObject *Rocket_append_string(Rocket *self, PyObject *args)
 		}
 
 		/* Extract timestamp */
-		t64.d = strtod(buf, &endptr);
-		if (endptr == buf)
-			return raise_str(linenum, buf - linestart + 1,
-					 ERR_OTHER, "bad timestamp");
-		if (t64.d <= last_timestamp)
-			return raise_num(linenum, buf - linestart + 1,
-					 ERR_NON_MONOTONIC, t64.d);
-		last_timestamp = t64.d;
-		if (t64.d < start || t64.d >= end)
-			return raise_num(linenum, buf - linestart + 1,
-					 ERR_OUT_OF_INTERVAL, t64.d);
+		t64.i = strtoll(buf, &endptr, 10);
+		if (endptr == buf || !isspace(*endptr)) {
+			/* Try parsing as a double instead */
+			t64.d = strtod(buf, &endptr);
+			if (endptr == buf)
+				goto bad_timestamp;
+			if (!isspace(*endptr))
+				goto cant_parse_value;
+			t64.i = round(t64.d);
+		}
+		if (t64.i <= last_timestamp)
+			return raise_int(linenum, buf - linestart + 1,
+					 ERR_NON_MONOTONIC, t64.i);
+		last_timestamp = t64.i;
+		if (t64.i < start || t64.i >= end)
+			return raise_int(linenum, buf - linestart + 1,
+					 ERR_OUT_OF_INTERVAL, t64.i);
 		t64.u = le64toh(t64.u);
 		if (fwrite(&t64.u, 8, 1, self->file) != 1)
 			goto err;
@@ -482,11 +495,14 @@ static PyObject *Rocket_append_string(Rocket *self, PyObject *args)
 	/* Build return value and return*/
 	offset = buf - data;
 	PyObject *o;
-	o = Py_BuildValue("(iidi)", written, offset, last_timestamp, linenum);
+	o = Py_BuildValue("(iiLi)", written, offset, last_timestamp, linenum);
 	return o;
 err:
 	PyErr_SetFromErrno(PyExc_OSError);
 	return NULL;
+bad_timestamp:
+	return raise_str(linenum, buf - linestart + 1,
+			 ERR_OTHER, "bad timestamp");
 cant_parse_value:
 	return raise_str(linenum, buf - linestart + 1,
 			 ERR_OTHER, "can't parse value");
@@ -580,7 +596,7 @@ static PyObject *Rocket_extract_list(Rocket *self, PyObject *args)
 
 		/* Timestamp */
 		PyObject *entry = extract_pyobject(self->file,
-						   LAYOUT_TYPE_FLOAT64);
+						   LAYOUT_TYPE_INT64);
 		if (!entry || (PyList_SetItem(rowlist, 0, entry) < 0)) {
 			Py_DECREF(rowlist);
 			Py_DECREF(retlist);
@@ -653,8 +669,7 @@ static PyObject *Rocket_extract_string(Rocket *self, PyObject *args)
 		if (fread(&t64.u, 8, 1, self->file) != 1)
 			goto err;
 		t64.u = le64toh(t64.u);
-		/* Timestamps are always printed to the microsecond */
-		ret = sprintf(&str[len], "%.6f", t64.d);
+		ret = sprintf(&str[len], "%ld", t64.i);
 		if (ret <= 0)
 			goto err;
 		len += ret;

nilmdb/server/server.py

@@ -6,6 +6,7 @@ from __future__ import absolute_import
 import nilmdb.server
 from nilmdb.utils.printf import *
 from nilmdb.server.errors import NilmDBError
+from nilmdb.utils.time import string_to_timestamp
 
 import cherrypy
 import sys
@@ -304,8 +305,8 @@ class Stream(NilmApp):
             raise cherrypy.HTTPError("404 Not Found", "No such stream")
 
         # Check limits
-        start = float(start)
-        end = float(end)
+        start = string_to_timestamp(start)
+        end = string_to_timestamp(end)
         if start >= end:
             raise cherrypy.HTTPError("400 Bad Request",
                                      "start must precede end")
@@ -331,9 +332,9 @@ class Stream(NilmApp):
         removed.
         """
         if start is not None:
-            start = float(start)
+            start = string_to_timestamp(start)
         if end is not None:
-            end = float(end)
+            end = string_to_timestamp(end)
         if start is not None and end is not None:
             if start >= end:
                 raise cherrypy.HTTPError("400 Bad Request",
@@ -362,9 +363,9 @@ class Stream(NilmApp):
         'application/x-json-stream' for lack of a better option.
         """
         if start is not None:
-            start = float(start)
+            start = string_to_timestamp(start)
         if end is not None:
-            end = float(end)
+            end = string_to_timestamp(end)
 
         if start is not None and end is not None:
             if start >= end:
@@ -404,9 +405,9 @@ class Stream(NilmApp):
         Add count=True to return a count rather than actual data.
         """
         if start is not None:
-            start = float(start)
+            start = string_to_timestamp(start)
         if end is not None:
-            end = float(end)
+            end = string_to_timestamp(end)
 
         # Check parameters
         if start is not None and end is not None:

nilmdb/utils/time.py

@@ -1,11 +1,80 @@
 from nilmdb.utils import datetime_tz
 import re
 
+USE_FLOATS=0
+
+# Range
+min_timestamp = (-2**63)
+max_timestamp = (2**62 - 1)
+
+# Smallest representable step
+epsilon = 1
+
+if USE_FLOATS:
+    min_timestamp = -1e12
+    max_timestamp = 1e12
+    epsilon = 1e-6
+
+def string_to_timestamp(str):
+    """Convert a string that represents an integer number of microseconds
+    since epoch."""
+    if USE_FLOATS:
+        return float(str)
+    try:
+        # Parse a string like "1234567890123456" and return an integer
+        return int(str)
+    except ValueError:
+         # For now, don't parse as float, to catch transition errors.
+        raise ValueError("can't parse timestamp as integer")
+
+        # Try parsing as a float, in case it's "1234567890123456.0"
+        return int(round(float(str)))
+
+def timestamp_to_string(timestamp):
+    """Convert a timestamp (integer microseconds since epoch) to a string"""
+    if USE_FLOATS:
+        return "%.6f" % timestamp
+    if isinstance(timestamp, float):
+        return str(int(round(timestamp)))
+    else:
+        return str(timestamp)
+
+def timestamp_to_human(timestamp):
+    """Convert a timestamp (integer microseconds since epoch) to a
+    human-readable string, using the local timezone for display
+    (e.g. from the TZ env var)."""
+    dt = datetime_tz.datetime_tz.fromtimestamp(timestamp_to_unix(timestamp))
+    return dt.strftime("%a, %d %b %Y %H:%M:%S.%f %z")
+
+def unix_to_timestamp(unix):
+    """Convert a Unix timestamp (floating point seconds since epoch)
+    into a NILM timestamp (integer microseconds since epoch)"""
+    if USE_FLOATS:
+        return unix
+    return int(round(unix * 1e6))
+
+def timestamp_to_unix(timestamp):
+    """Convert a NILM timestamp (integer microseconds since epoch)
+    into a Unix timestamp (floating point seconds since epoch)"""
+    if USE_FLOATS:
+        return timestamp
+    return timestamp / 1e6
+timestamp_to_seconds = timestamp_to_unix
+
+def rate_to_period(hz, cycles = 1):
+    """Convert a rate (in Hz) to a period (in timestamp units).
+    Returns an integer."""
+    period = unix_to_timestamp(cycles) / float(hz)
+    if USE_FLOATS:
+        return period
+    return int(round(period))
+
 def parse_time(toparse):
     """
-    Parse a free-form time string and return a datetime_tz object.
-    If the string doesn't contain a timestamp, the current local
-    timezone is assumed (e.g. from the TZ env var).
+    Parse a free-form time string and return a nilmdb timestamp
+    (integer seconds since epoch).  If the string doesn't contain a
+    timestamp, the current local timezone is assumed (e.g. from the TZ
+    env var).
     """
     # If string isn't "now" and doesn't contain at least 4 digits,
     # consider it invalid.  smartparse might otherwise accept
@@ -15,17 +84,28 @@ def parse_time(toparse):
 
     # Try to just parse the time as given
     try:
-        return datetime_tz.datetime_tz.smartparse(toparse)
-    except ValueError:
+        return unix_to_timestamp(datetime_tz.datetime_tz.
+                                 smartparse(toparse).totimestamp())
+    except (ValueError, OverflowError):
         pass
 
-    # Try to treat it as a single double
+    # If it starts with @, treat it as a NILM timestamp
+    # (integer microseconds since epoch)
     try:
-        timestamp = float(toparse)
-        # range is from about year 2001 - 2065
-        if timestamp < 1e9 or timestamp > 3e9:
-            raise ValueError
-        return datetime_tz.datetime_tz.fromtimestamp(timestamp)
+        if toparse[0] == '@':
+            return int(toparse[1:])
+    except (ValueError, KeyError):
+        pass
+
+    # If it's parseable as a float, treat it as a Unix or NILM
+    # timestamp based on its range.
+    try:
+        val = float(toparse)
+        # range is from about year 2001 - 2128
+        if val > 1e9 and val < 5e9:
+            return unix_to_timestamp(val)
+        if val > 1e15 and val < 5e15:
+            return val
     except ValueError:
         pass
 
@@ -47,7 +127,8 @@ def parse_time(toparse):
                     r")", toparse)
     if res is not None:
         try:
-            return datetime_tz.datetime_tz.smartparse(res.group(2))
+            return unix_to_timestamp(datetime_tz.datetime_tz.
+                                     smartparse(res.group(2)).totimestamp())
         except ValueError:
             pass
 
@@ -55,15 +136,6 @@ def parse_time(toparse):
     # just give up for now.
     raise ValueError("unable to parse timestamp")
 
-def format_time(timestamp):
-    """
-    Convert a Unix timestamp to a string for printing, using the
-    local timezone for display (e.g. from the TZ env var).
-    """
-    dt = datetime_tz.datetime_tz.fromtimestamp(timestamp)
-    return dt.strftime("%a, %d %b %Y %H:%M:%S.%f %z")
-
-def float_time_to_string(timestamp):
-    """Convert a floating-point Unix timestamp to a string,
-    like '1234567890.000000'"""
-    return "%.6f" % timestamp
+def now():
+    """Return current timestamp"""
+    return unix_to_timestamp(datetime_tz.datetime_tz.utcnow().totimestamp())

nilmdb/utils/timestamper.py

@@ -1,7 +1,7 @@
 """File-like objects that add timestamps to the input lines"""
 
 from nilmdb.utils.printf import *
-from nilmdb.utils import datetime_tz
+import nilmdb.utils.time
 
 class Timestamper(object):
     """A file-like object that adds timestamps to lines of an input file."""
@@ -61,31 +61,33 @@ class TimestamperRate(Timestamper):
 
         end: If specified, raise StopIteration before outputting a value
              greater than this."""
+        timestamp_to_string = nilmdb.utils.time.timestamp_to_string
+        rate_to_period = nilmdb.utils.time.rate_to_period
         def iterator(start, rate, end):
             n = 0
             rate = float(rate)
             while True:
-                now = start + n / rate
+                now = start + rate_to_period(rate, n)
                 if end and now >= end:
                     raise StopIteration
-                yield sprintf("%.6f ", start + n / rate)
+                yield timestamp_to_string(now) + " "
                 n += 1
         Timestamper.__init__(self, infile, iterator(start, rate, end))
         self.start = start
         self.rate = rate
     def __str__(self):
-        start = datetime_tz.datetime_tz.fromtimestamp(self.start)
-        start = start.strftime("%a, %d %b %Y %H:%M:%S %Z")
         return sprintf("TimestamperRate(..., start=\"%s\", rate=%g)",
-                       str(start), self.rate)
+                       nilmdb.utils.time.timestamp_to_human(self.start),
+                       self.rate)
 
 class TimestamperNow(Timestamper):
     """Timestamper that uses current time"""
     def __init__(self, infile):
+        timestamp_to_string = nilmdb.utils.time.timestamp_to_string
+        get_now = nilmdb.utils.time.now
         def iterator():
             while True:
-                now = datetime_tz.datetime_tz.utcnow().totimestamp()
-                yield sprintf("%.6f ", now)
+                yield timestamp_to_string(get_now()) + " "
         Timestamper.__init__(self, infile, iterator())
     def __str__(self):
         return "TimestamperNow(...)"

tests/data/extract-1

@@ -2,123 +2,123 @@
 # layout: float32_8
 # start: Fri, 23 Mar 2012 10:00:30.000000 +0000
 # end: Fri, 23 Mar 2012 10:00:31.000000 +0000
-1332496830.000000 2.517740e+05 2.242410e+05 5.688100e+03 1.915530e+03 9.329220e+03 4.183710e+03 1.212350e+03 2.641790e+03
-1332496830.008333 2.595670e+05 2.226980e+05 6.207600e+03 6.786720e+02 9.380230e+03 4.575580e+03 2.830610e+03 2.688630e+03
-1332496830.016667 2.630730e+05 2.233040e+05 4.961640e+03 2.197120e+03 7.687310e+03 4.861860e+03 2.732780e+03 3.008540e+03
-1332496830.025000 2.576140e+05 2.233230e+05 5.003660e+03 3.525140e+03 7.165310e+03 4.685620e+03 1.715380e+03 3.440480e+03
-1332496830.033333 2.557800e+05 2.219150e+05 6.357310e+03 2.145290e+03 8.426970e+03 3.775350e+03 1.475390e+03 3.797240e+03
-1332496830.041667 2.601660e+05 2.230080e+05 6.702590e+03 1.484960e+03 9.288100e+03 3.330830e+03 1.228500e+03 3.214320e+03
-1332496830.050000 2.612310e+05 2.264260e+05 4.980060e+03 2.982380e+03 8.499630e+03 4.267670e+03 9.940890e+02 2.292890e+03
-1332496830.058333 2.551170e+05 2.266420e+05 4.584410e+03 4.656440e+03 7.860150e+03 5.317310e+03 1.473600e+03 2.111690e+03
-1332496830.066667 2.533000e+05 2.235540e+05 6.455090e+03 3.036650e+03 8.869750e+03 4.986310e+03 2.607360e+03 2.839590e+03
-1332496830.075000 2.610610e+05 2.212630e+05 6.951980e+03 1.500240e+03 9.386100e+03 3.791680e+03 2.677010e+03 3.980630e+03
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-1332496830.091667 2.606920e+05 2.251840e+05 3.782480e+03 4.642880e+03 7.662960e+03 3.917790e+03 -2.510970e+02 2.907060e+03
-1332496830.100000 2.539630e+05 2.250810e+05 5.123530e+03 3.839550e+03 8.669030e+03 4.877820e+03 9.437240e+02 2.527450e+03
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-1332496830.133333 2.550090e+05 2.230180e+05 4.584820e+03 2.864000e+03 8.469490e+03 3.625580e+03 9.855570e+02 3.504230e+03
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-1332496830.191667 2.602360e+05 2.252650e+05 3.425140e+03 3.339080e+03 7.853610e+03 3.674950e+03 5.259080e+02 2.443310e+03
-1332496830.200000 2.535030e+05 2.245270e+05 4.398130e+03 2.927430e+03 8.110280e+03 4.842470e+03 1.513870e+03 2.467100e+03
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-1332496830.216667 2.616770e+05 2.236080e+05 5.830460e+03 1.033910e+03 8.123940e+03 3.980690e+03 1.927960e+03 4.092720e+03
-1332496830.225000 2.594570e+05 2.255360e+05 4.015570e+03 2.995990e+03 7.135440e+03 3.713550e+03 3.072200e+02 3.849430e+03
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-1332496830.250000 2.630240e+05 2.215590e+05 5.789960e+03 6.994170e+02 9.129740e+03 4.153080e+03 2.829250e+03 2.677270e+03
-1332496830.258333 2.617200e+05 2.240150e+05 4.358500e+03 2.645360e+03 7.414110e+03 4.810670e+03 2.225990e+03 3.185990e+03
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-1332496830.308333 2.544870e+05 2.225080e+05 6.635860e+03 1.758850e+03 8.732970e+03 4.466970e+03 2.650360e+03 3.139310e+03
-1332496830.316667 2.612410e+05 2.224320e+05 6.702270e+03 1.085130e+03 8.989230e+03 3.112990e+03 1.933560e+03 3.828410e+03
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-1332496830.333333 2.549990e+05 2.265140e+05 4.532090e+03 4.126900e+03 8.200130e+03 3.872590e+03 5.608900e+01 2.370580e+03
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-1332496830.400000 2.550830e+05 2.259240e+05 3.350310e+03 4.853070e+03 7.045820e+03 5.925200e+03 1.893610e+03 2.897340e+03
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-1332496830.441667 2.506870e+05 2.263310e+05 4.517860e+03 3.183800e+03 8.072600e+03 5.281660e+03 1.605140e+03 2.335140e+03
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-1332496830.483333 2.610460e+05 2.215500e+05 5.816180e+03 5.902170e+02 9.120930e+03 3.895400e+03 2.382670e+03 2.824170e+03
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-1332496830.525000 2.633430e+05 2.232350e+05 5.200430e+03 1.388580e+03 9.372850e+03 3.371230e+03 1.450390e+03 2.678910e+03
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-1332496830.558333 2.618410e+05 2.235370e+05 5.500740e+03 1.189660e+03 8.365730e+03 4.016470e+03 1.042270e+03 3.821200e+03
-1332496830.566667 2.595030e+05 2.258400e+05 3.827930e+03 3.088840e+03 7.676140e+03 3.978310e+03 -3.570070e+02 3.016420e+03
-1332496830.575000 2.534570e+05 2.246360e+05 4.914610e+03 3.097450e+03 8.224900e+03 4.321440e+03 1.713740e+02 2.412360e+03
-1332496830.583333 2.560290e+05 2.222210e+05 6.841800e+03 1.028500e+03 9.252300e+03 4.387570e+03 2.418140e+03 2.510100e+03
-1332496830.591667 2.628400e+05 2.225500e+05 6.210250e+03 1.410730e+03 8.538900e+03 4.152580e+03 3.009300e+03 3.219760e+03
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tests/data/extract-2

@@ -1,119 +1,119 @@
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tests/data/extract-3

@@ -1 +1 @@
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tests/data/extract-4

@@ -1,2 +1,2 @@
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tests/data/extract-7

@@ -1,124 +1,124 @@
 # path: /newton/prep
 # layout: float32_8
-# start: 1332496830.000000
-# end: 1332496830.999000
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tests/data/prep-20120323T1004-badtimes

@@ -1,11 +1,11 @@
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+1332497040000000 2.56439e+05  2.24775e+05  2.92897e+03  4.66646e+03  7.58491e+03  3.57351e+03  -4.34171e+02  2.98819e+03  
+1332497040010000 2.51903e+05  2.23202e+05  4.23696e+03  3.49363e+03  8.53493e+03  4.29416e+03  8.49573e+02  2.38189e+03  
+1332497040020000 2.57625e+05  2.20247e+05  5.47017e+03  1.35872e+03  9.18903e+03  4.56136e+03  2.65599e+03  2.60912e+03  
+1332497040030000 2.63375e+05  2.20706e+05  4.51842e+03  1.80758e+03  8.17208e+03  4.17463e+03  2.57884e+03  3.32848e+03  
+1332497040040000 2.59221e+05  2.22346e+05  2.98879e+03  3.66264e+03  6.87274e+03  3.94223e+03  1.25928e+03  3.51786e+03  
+1332497040050000 2.51918e+05  2.22281e+05  4.22677e+03  2.84764e+03  7.78323e+03  3.81659e+03  8.04944e+02  3.46314e+03  
+1332497040050000 2.54478e+05  2.21701e+05  5.61366e+03  1.02262e+03  9.26581e+03  3.50152e+03  1.29331e+03  3.07271e+03  
+1332497040060000 2.59568e+05  2.22945e+05  4.97190e+03  1.28250e+03  8.62081e+03  4.06316e+03  1.85717e+03  2.61990e+03  
+1332497040070000 2.57269e+05  2.23697e+05  3.60527e+03  3.05749e+03  7.22363e+03  4.90330e+03  1.93736e+03  2.35357e+03  
+1332497040080000 2.52274e+05  2.21438e+05  5.01228e+03  2.86309e+03  7.87115e+03  4.80448e+03  2.18291e+03  2.93397e+03  
+1332497040090000 2.56468e+05  2.19205e+05  6.29804e+03  8.09467e+02  9.12895e+03  3.52055e+03  2.16980e+03  3.88739e+03  

tests/test_client.py

@@ -186,8 +186,7 @@ class TestClient(object):
         datetime_tz.localtz_set("America/New_York")
 
         testfile = "tests/data/prep-20120323T1000"
-        start = datetime_tz.datetime_tz.smartparse("20120323T1000")
-        start = start.totimestamp()
+        start = nilmdb.utils.time.parse_time("20120323T1000")
         rate = 120
 
         # First try a nonexistent path
@@ -243,32 +242,32 @@ class TestClient(object):
         data = timestamper.TimestamperRate(testfile, start, 120)
         with assert_raises(ClientError) as e:
             result = client.stream_insert("/newton/prep", data,
-                                          start + 5, start + 120)
+                                          start + 5000000, start + 120000000)
         in_("400 Bad Request", str(e.exception))
-        in_("Data timestamp 1332511200.000000 < start time 1332511205.000000",
+        in_("Data timestamp 1332511200000000 < start time 1332511205000000",
             str(e.exception))
 
         # Specify start/end (ends too early)
         data = timestamper.TimestamperRate(testfile, start, 120)
         with assert_raises(ClientError) as e:
             result = client.stream_insert("/newton/prep", data,
-                                          start, start + 1)
+                                          start, start + 1000000)
         in_("400 Bad Request", str(e.exception))
         # Client chunks the input, so the exact timestamp here might change
         # if the chunk positions change.
-        assert(re.search("Data timestamp 13325[0-9]+\.[0-9]+ "
-                         ">= end time 1332511201.000000", str(e.exception))
+        assert(re.search("Data timestamp 13325[0-9]+ "
+                         ">= end time 1332511201000000", str(e.exception))
                is not None)
 
         # Now do the real load
         data = timestamper.TimestamperRate(testfile, start, 120)
         result = client.stream_insert("/newton/prep", data,
-                                      start, start + 119.999777)
+                                      start, start + 119999777)
 
         # Verify the intervals.  Should be just one, even if the data
         # was inserted in chunks, due to nilmdb interval concatenation.
         intervals = list(client.stream_intervals("/newton/prep"))
-        eq_(intervals, [[start, start + 119.999777]])
+        eq_(intervals, [[start, start + 119999777]])
 
         # Try some overlapping data -- just insert it again
         data = timestamper.TimestamperRate(testfile, start, 120)
@@ -284,11 +283,12 @@ class TestClient(object):
         # Misc tests for extract and remove.  Most of them are in test_cmdline.
         client = nilmdb.client.Client(url = testurl)
 
-        for x in client.stream_extract("/newton/prep", 999123, 999124):
+        for x in client.stream_extract("/newton/prep",
+                                       999123000000, 999124000000):
             raise AssertionError("shouldn't be any data for this request")
 
         with assert_raises(ClientError) as e:
-            client.stream_remove("/newton/prep", 123, 120)
+            client.stream_remove("/newton/prep", 123000000, 120000000)
 
         # Test count
         eq_(client.stream_count("/newton/prep"), 14400)
@@ -301,13 +301,11 @@ class TestClient(object):
         client = nilmdb.client.Client(url = testurl)
 
         # Trigger a client error in generator
-        start = datetime_tz.datetime_tz.smartparse("20120323T2000")
-        end = datetime_tz.datetime_tz.smartparse("20120323T1000")
+        start = nilmdb.utils.time.parse_time("20120323T2000")
+        end = nilmdb.utils.time.parse_time("20120323T1000")
         for function in [ client.stream_intervals, client.stream_extract ]:
             with assert_raises(ClientError) as e:
-                function("/newton/prep",
-                         start.totimestamp(),
-                         end.totimestamp()).next()
+                function("/newton/prep", start, end).next()
             in_("400 Bad Request", str(e.exception))
             in_("start must precede end", str(e.exception))
 
@@ -455,21 +453,21 @@ class TestClient(object):
             ctx.insert("  105 1\n")
             ctx.finalize()
 
-            ctx.insert("106 1\n")
-            ctx.update_end(106.5)
-            ctx.finalize()
-            ctx.update_start(106.8)
             ctx.insert("107 1\n")
-            ctx.insert("108 1\n")
-            ctx.insert("109 1\n")
+            ctx.update_end(108)
+            ctx.finalize()
+            ctx.update_start(109)
             ctx.insert("110 1\n")
             ctx.insert("111 1\n")
-            ctx.update_end(113)
             ctx.insert("112 1\n")
-            ctx.update_end(114)
             ctx.insert("113 1\n")
-            ctx.update_end(115)
-            ctx.insert("114 1" +
+            ctx.insert("114 1\n")
+            ctx.update_end(116)
+            ctx.insert("115 1\n")
+            ctx.update_end(117)
+            ctx.insert("116 1\n")
+            ctx.update_end(118)
+            ctx.insert("117 1" +
                        " # this is super long" * 100 +
                        "\n")
             ctx.finalize()
@@ -477,11 +475,11 @@ class TestClient(object):
 
         with assert_raises(ClientError):
             with client.stream_insert_context("/context/test", 100, 200) as ctx:
-                ctx.insert("115 1\n")
+                ctx.insert("118 1\n")
 
         with assert_raises(ClientError):
             with client.stream_insert_context("/context/test", 200, 300) as ctx:
-                ctx.insert("115 1\n")
+                ctx.insert("118 1\n")
 
         with assert_raises(ClientError):
             with client.stream_insert_context("/context/test") as ctx:
@@ -503,9 +501,9 @@ class TestClient(object):
                 ctx.finalize()
 
         eq_(list(client.stream_intervals("/context/test")),
-            [ [ 100, 105.000001 ],
-              [ 106, 106.5 ],
-              [ 106.8, 115 ],
+            [ [ 100, 106 ],
+              [ 107, 108 ],
+              [ 109, 118 ],
               [ 200, 300 ] ])
 
         client.stream_destroy("/context/test")
@@ -567,7 +565,7 @@ class TestClient(object):
             ctx.finalize() # nothing
             ctx.finalize() # nothing
             ctx.insert("1100 1\n")
-            ctx.finalize() # inserts [1100, 1100.000001]
+            ctx.finalize() # inserts [1100, 1101]
             ctx.update_start(1199)
             ctx.insert("1200 1\n")
             ctx.update_end(1250)
@@ -595,7 +593,7 @@ class TestClient(object):
                      (0, [400, 450]),
                      (0, [500, 550]),
                      (0, [1000, 1050]),
-                     (1, [1100, 1100.000001]),
+                     (1, [1100, 1101]),
                      (1, [1199, 1250]),
                      (0, [1400, 1450]),
                      (0, [1500, 1550]),
@@ -639,3 +637,26 @@ class TestClient(object):
             # Clean up
             c.stream_destroy("/persist/test")
             eq_(connections(), (1, 6))
+
+    def test_client_13_timestamp_rounding(self):
+        raise SkipTest("doesn't work right")
+
+        # Test potentially bad timestamps (due to floating point roundoff etc)
+        client = nilmdb.client.Client(testurl)
+
+        client.stream_create("/rounding/test", "uint16_1")
+        with client.stream_insert_context("/rounding/test",
+                                          100000000, 200000000) as ctx:
+            ctx.insert("100000000 1\n")
+            ctx.insert("150000000 1\n")
+            ctx.insert("199999999 1\n")
+
+        with assert_raises(ClientError):
+            with client.stream_insert_context("/rounding/test",
+                                              200000000, 300000000) as ctx:
+                ctx.insert("200000000 1\n")
+                ctx.insert("250000000 1\n")
+                ctx.insert("299999999.99 1\n")
+
+        client.stream_destroy("/rounding/test")
+        client.close()

tests/test_cmdline.py

@@ -15,6 +15,7 @@ import re
 import sys
 import StringIO
 import shlex
+import warnings