X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fcommon.c;h=b679bf70f4ccff6a385c47b5fb4f47ccbd26a8b1;hb=c7b0f0b0267f2ab7c84eea8306f0a516f5b8f769;hp=0bd9f68fe84a751c339cc9b652c0587d9aa7273b;hpb=1126617bebe569dffe6b7a5d3f0c400134b41d65;p=collectd.git

diff --git a/src/common.c b/src/common.c
index 0bd9f68f..b679bf70 100644
--- a/src/common.c
+++ b/src/common.c
@@ -1229,7 +1229,102 @@ counter_t counter_diff (counter_t old_value, counter_t new_value)
 	}
 
 	return (diff);
-} /* counter_t counter_to_gauge */
+} /* counter_t counter_diff */
+
+int rate_to_value (value_t *ret_value, gauge_t rate, /* {{{ */
+		rate_to_value_state_t *state,
+		int ds_type, cdtime_t t)
+{
+	gauge_t delta_gauge;
+	cdtime_t delta_t;
+
+	if (ds_type == DS_TYPE_GAUGE)
+	{
+		state->last_value.gauge = rate;
+		state->last_time = t;
+
+		*ret_value = state->last_value;
+		return (0);
+	}
+
+	/* Counter and absolute can't handle negative rates. Reset "last time"
+	 * to zero, so that the next valid rate will re-initialize the
+	 * structure. */
+	if ((rate < 0.0)
+			&& ((ds_type == DS_TYPE_COUNTER)
+				|| (ds_type == DS_TYPE_ABSOLUTE)))
+	{
+		memset (state, 0, sizeof (*state));
+		return (EINVAL);
+	}
+
+	/* Another invalid state: The time is not increasing. */
+	if (t <= state->last_time)
+	{
+		memset (state, 0, sizeof (*state));
+		return (EINVAL);
+	}
+
+	delta_t = t - state->last_time;
+	delta_gauge = (rate * CDTIME_T_TO_DOUBLE (delta_t)) + state->residual;
+
+	/* Previous value is invalid. */
+	if (state->last_time == 0) /* {{{ */
+	{
+		if (ds_type == DS_TYPE_DERIVE)
+		{
+			state->last_value.derive = (derive_t) rate;
+			state->residual = rate - ((gauge_t) state->last_value.derive);
+		}
+		else if (ds_type == DS_TYPE_COUNTER)
+		{
+			state->last_value.counter = (counter_t) rate;
+			state->residual = rate - ((gauge_t) state->last_value.counter);
+		}
+		else if (ds_type == DS_TYPE_ABSOLUTE)
+		{
+			state->last_value.absolute = (absolute_t) rate;
+			state->residual = rate - ((gauge_t) state->last_value.absolute);
+		}
+		else
+		{
+			assert (23 == 42);
+		}
+
+		state->last_time = t;
+		return (EAGAIN);
+	} /* }}} */
+
+	if (ds_type == DS_TYPE_DERIVE)
+	{
+		derive_t delta_derive = (derive_t) delta_gauge;
+
+		state->last_value.derive += delta_derive;
+		state->residual = delta_gauge - ((gauge_t) delta_derive);
+	}
+	else if (ds_type == DS_TYPE_COUNTER)
+	{
+		counter_t delta_counter = (counter_t) delta_gauge;
+
+		state->last_value.counter += delta_counter;
+		state->residual = delta_gauge - ((gauge_t) delta_counter);
+	}
+	else if (ds_type == DS_TYPE_ABSOLUTE)
+	{
+		absolute_t delta_absolute = (absolute_t) delta_gauge;
+
+		state->last_value.absolute = delta_absolute;
+		state->residual = delta_gauge - ((gauge_t) delta_absolute);
+	}
+	else
+	{
+		assert (23 == 42);
+	}
+
+        state->last_time = t;
+	*ret_value = state->last_value;
+	return (0);
+} /* }}} value_t rate_to_value */
 
 int service_name_to_port_number (const char *service_name)
 {