stats: Move statsd related code into a separate file

This commit moves the stats specific code parts into stats_statsd.c
while keeping the generic parts in stats.c. The code in stats.c no
longer contains references to statsd symbols.

Note that the VTY code still needs to know about every stats reporter
backend.

Sponsored-by: On-Waves ehf

1 files changed, 158 insertions, 0 deletions

diff --git a/src/stats_statsd.c b/src/stats_statsd.c
new file mode 100644
index 00000000..c76f8f69
--- /dev/null
+++ b/src/stats_statsd.c
@@ -0,0 +1,158 @@
+/*
+ * (C) 2015 by Sysmocom s.f.m.c. GmbH
+ *
+ * Author: Jacob Erlbeck <jerlbeck@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <osmocom/core/stats.h>
+
+#include <string.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/rate_ctr.h>
+#include <osmocom/core/stat_item.h>
+#include <osmocom/core/msgb.h>
+
+static int osmo_stats_reporter_statsd_send_counter(struct osmo_stats_reporter *srep,
+	const struct rate_ctr_group *ctrg,
+	const struct rate_ctr_desc *desc,
+	int64_t value, int64_t delta);
+static int osmo_stats_reporter_statsd_send_item(struct osmo_stats_reporter *srep,
+	const struct osmo_stat_item_group *statg,
+	const struct osmo_stat_item_desc *desc, int value);
+
+struct osmo_stats_reporter *osmo_stats_reporter_create_statsd(const char *name)
+{
+	struct osmo_stats_reporter *srep;
+	srep = osmo_stats_reporter_alloc(OSMO_STATS_REPORTER_STATSD, name);
+
+	srep->have_net_config = 1;
+
+	srep->open = osmo_stats_reporter_udp_open;
+	srep->close = osmo_stats_reporter_udp_close;
+	srep->send_counter = osmo_stats_reporter_statsd_send_counter;
+	srep->send_item = osmo_stats_reporter_statsd_send_item;
+
+	return srep;
+}
+
+static int osmo_stats_reporter_statsd_send(struct osmo_stats_reporter *srep,
+	const char *name1, unsigned int index1, const char *name2, int value,
+	const char *unit)
+{
+	char *buf;
+	int buf_size;
+	int nchars, rc = 0;
+	char *fmt = NULL;
+	char *prefix = srep->name_prefix;
+	int old_len = msgb_length(srep->buffer);
+
+	if (prefix) {
+		if (name1) {
+			if (index1 != 0)
+				fmt = "%1$s.%2$s.%6$u.%3$s:%4$d|%5$s";
+			else
+				fmt = "%1$s.%2$s.%3$s:%4$d|%5$s";
+		} else {
+			fmt = "%1$s.%2$0.0s%3$s:%4$d|%5$s";
+		}
+	} else {
+		prefix = "";
+		if (name1) {
+			if (index1 != 0)
+				fmt = "%1$s%2$s.%6$u.%3$s:%4$d|%5$s";
+			else
+				fmt = "%1$s%2$s.%3$s:%4$d|%5$s";
+		} else {
+			fmt = "%1$s%2$0.0s%3$s:%4$d|%5$s";
+		}
+	}
+
+	if (srep->agg_enabled) {
+		if (msgb_length(srep->buffer) > 0 &&
+			msgb_tailroom(srep->buffer) > 0)
+		{
+			msgb_put_u8(srep->buffer, '\n');
+		}
+	}
+
+	buf = (char *)msgb_put(srep->buffer, 0);
+	buf_size = msgb_tailroom(srep->buffer);
+
+	nchars = snprintf(buf, buf_size, fmt,
+		prefix, name1, name2,
+		value, unit, index1);
+
+	if (nchars >= buf_size) {
+		/* Truncated */
+		/* Restore original buffer (without trailing LF) */
+		msgb_trim(srep->buffer, old_len);
+		/* Send it */
+		rc = osmo_stats_reporter_send_buffer(srep);
+
+		/* Try again */
+		buf = (char *)msgb_put(srep->buffer, 0);
+		buf_size = msgb_tailroom(srep->buffer);
+
+		nchars = snprintf(buf, buf_size, fmt,
+			prefix, name1, name2,
+			value, unit, index1);
+
+		if (nchars >= buf_size)
+			return -EMSGSIZE;
+	}
+
+	if (nchars > 0)
+		msgb_trim(srep->buffer, msgb_length(srep->buffer) + nchars);
+
+	if (!srep->agg_enabled)
+		rc = osmo_stats_reporter_send_buffer(srep);
+
+	return rc;
+}
+
+static int osmo_stats_reporter_statsd_send_counter(struct osmo_stats_reporter *srep,
+	const struct rate_ctr_group *ctrg,
+	const struct rate_ctr_desc *desc,
+	int64_t value, int64_t delta)
+{
+	if (ctrg)
+		return osmo_stats_reporter_statsd_send(srep,
+			ctrg->desc->group_name_prefix,
+			ctrg->idx,
+			desc->name, delta, "c");
+	else
+		return osmo_stats_reporter_statsd_send(srep,
+			NULL, 0,
+			desc->name, delta, "c");
+}
+
+static int osmo_stats_reporter_statsd_send_item(struct osmo_stats_reporter *srep,
+	const struct osmo_stat_item_group *statg,
+	const struct osmo_stat_item_desc *desc, int value)
+{
+	return osmo_stats_reporter_statsd_send(srep,
+		statg->desc->group_name_prefix,
+		statg->idx,
+		desc->name, value, desc->unit);
+}