src/utils_latency.c: Add unit test.

This test successfully reproduces the crash reported in #1131 by calling
latency_counter_add (l, DOUBLE_TO_CDTIME_T (-1.0));

diff --git a/src/Makefile.am b/src/Makefile.am
index 2c7c182..cc6f62e 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -27,6 +27,13 @@ noinst_LTLIBRARIES =
 check_PROGRAMS =
 TESTS =
 
+noinst_LTLIBRARIES += liblatency.la
+liblatency_la_SOURCES = utils_latency.c utils_latency.h
+check_PROGRAMS += test_utils_latency
+TESTS += test_utils_latency
+test_utils_latency_SOURCES = utils_latency_test.c testing.h
+test_utils_latency_LDADD = liblatency.la daemon/libcommon.la daemon/libplugin_mock.la -lm
+
 noinst_LTLIBRARIES += liblookup.la
 liblookup_la_SOURCES = utils_vl_lookup.c utils_vl_lookup.h
 liblookup_la_LIBADD = daemon/libavltree.la
@@ -966,10 +973,9 @@ endif
 
 if BUILD_PLUGIN_STATSD
 pkglib_LTLIBRARIES += statsd.la
-statsd_la_SOURCES = statsd.c \
-                    utils_latency.h utils_latency.c
+statsd_la_SOURCES = statsd.c
 statsd_la_LDFLAGS = $(PLUGIN_LDFLAGS)
-statsd_la_LIBADD = -lpthread -lm
+statsd_la_LIBADD = liblatency.la -lpthread -lm
 endif
 
 if BUILD_PLUGIN_SWAP

diff --git a/src/testing.h b/src/testing.h
index 805449f..84a1242 100644 (file)
--- a/src/testing.h
+++ b/src/testing.h
@@ -27,6 +27,10 @@
 static int fail_count__ = 0;
 static int check_count__ = 0;
 
+#ifndef DBL_PRECISION
+# define DBL_PRECISION 1e-12
+#endif
+
 #define DEF_TEST(func) static int test_##func ()
 
 #define RUN_TEST(func) do { \
@@ -70,7 +74,7 @@ static int check_count__ = 0;
     printf ("not ok %i - %s incorrect: expected %.15g, got %.15g\n", \
         ++check_count__, #actual, e, a); \
     return (-1); \
-  } else if (!isnan (e) && (((e-a) < -1e-12) || ((e-a) > 1e-12))) { \
+  } else if (!isnan (e) && (((e-a) < -DBL_PRECISION) || ((e-a) > DBL_PRECISION))) { \
     printf ("not ok %i - %s incorrect: expected %.15g, got %.15g\n", \
         ++check_count__, #actual, e, a); \
     return (-1); \

diff --git a/src/utils_latency_test.c b/src/utils_latency_test.c
new file mode 100644 (file)
index 0000000..9aecf38
--- /dev/null
+++ b/src/utils_latency_test.c
@@ -0,0 +1,105 @@
+/**
+ * collectd - src/utils_latency_test.c
+ * Copyright (C) 2015       Florian octo Forster
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *   Florian octo Forster <octo at collectd.org>
+ */
+
+#define DBL_PRECISION 1e-9
+
+#include "testing.h"
+#include "collectd.h"
+#include "common.h" /* for STATIC_ARRAY_SIZE */
+#include "utils_time.h"
+#include "utils_latency.h"
+
+DEF_TEST(simple)
+{
+  struct {
+    double val;
+    double min;
+    double max;
+    double sum;
+    double avg;
+  } cases[] = {
+  /* val  min  max  sum  avg */
+    {0.5, 0.5, 0.5, 0.5, 0.5},
+    {0.3, 0.3, 0.5, 0.8, 0.4},
+    {0.7, 0.3, 0.7, 1.5, 0.5},
+    {2.5, 0.3, 2.5, 4.0, 1.0},
+    { -1, 0.3, 2.5, 4.0, 1.0},
+  };
+  size_t i;
+  latency_counter_t *l;
+
+  CHECK_NOT_NULL (l = latency_counter_create ());
+
+  for (i = 0; i < STATIC_ARRAY_SIZE (cases); i++) {
+    latency_counter_add (l, DOUBLE_TO_CDTIME_T (cases[i].val));
+
+    DBLEQ (cases[i].min, CDTIME_T_TO_DOUBLE (latency_counter_get_min (l)));
+    DBLEQ (cases[i].max, CDTIME_T_TO_DOUBLE (latency_counter_get_max (l)));
+    DBLEQ (cases[i].sum, CDTIME_T_TO_DOUBLE (latency_counter_get_sum (l)));
+    DBLEQ (cases[i].avg, CDTIME_T_TO_DOUBLE (latency_counter_get_average (l)));
+  }
+
+  latency_counter_destroy (l);
+  return 0;
+}
+
+DEF_TEST(percentile)
+{
+  size_t i;
+  latency_counter_t *l;
+
+  CHECK_NOT_NULL (l = latency_counter_create ());
+
+  for (i = 0; i < 100; i++) {
+    latency_counter_add (l, TIME_T_TO_CDTIME_T (((time_t) i) + 1));
+  }
+
+  DBLEQ (  1.0, CDTIME_T_TO_DOUBLE (latency_counter_get_min (l)));
+  DBLEQ (100.0, CDTIME_T_TO_DOUBLE (latency_counter_get_max (l)));
+  DBLEQ (100.0 * 101.0 / 2.0, CDTIME_T_TO_DOUBLE (latency_counter_get_sum (l)));
+  DBLEQ ( 50.5, CDTIME_T_TO_DOUBLE (latency_counter_get_average (l)));
+
+  DBLEQ (50.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 50.0)));
+  DBLEQ (80.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 80.0)));
+  DBLEQ (95.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 95.0)));
+  DBLEQ (99.0, CDTIME_T_TO_DOUBLE (latency_counter_get_percentile (l, 99.0)));
+
+  CHECK_ZERO (latency_counter_get_percentile (l, -1.0));
+  CHECK_ZERO (latency_counter_get_percentile (l, 101.0));
+
+  latency_counter_destroy (l);
+  return 0;
+}
+
+int main (void)
+{
+  RUN_TEST(simple);
+  RUN_TEST(percentile);
+
+  END_TEST;
+}
+
+/* vim: set sw=2 sts=2 et : */