1 files changed, 97 insertions, 0 deletions
diff --git a/include/haproxy/sink.h b/include/haproxy/sink.h
new file mode 100644
index 0000000..3b428a1
--- /dev/null
+++ b/include/haproxy/sink.h
@@ -0,0 +1,97 @@
+/*
+ * include/haproxy/sink.h
+ * This file provides declarations for event sinks management
+ *
+ * Copyright (C) 2000-2019 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef _HAPROXY_SINK_H
+#define _HAPROXY_SINK_H
+
+#include <sys/types.h>
+#include <haproxy/sink-t.h>
+#include <haproxy/thread.h>
+
+extern struct list sink_list;
+
+extern struct proxy *sink_proxies_list;
+
+struct sink *sink_find(const char *name);
+struct sink *sink_new_fd(const char *name, const char *desc, enum log_fmt, int fd);
+ssize_t __sink_write(struct sink *sink, struct log_header hdr, size_t maxlen,
+                     const struct ist msg[], size_t nmsg);
+int sink_announce_dropped(struct sink *sink, struct log_header hdr);
+
+
+/* tries to send <nmsg> message parts from message array <msg> to sink <sink>.
+ * Formatting according to the sink's preference is done here, unless sink->fmt
+ * is unspecified, in which case the caller formatting will be used instead.
+ *
+ * It will stop writing at <maxlen> instead of sink->maxlen if <maxlen> is
+ * positive and inferior to sink->maxlen.
+ *
+ * Lost messages are accounted for in the sink's counter. If there
+ * were lost messages, an attempt is first made to indicate it.
+ * The function returns the number of Bytes effectively sent or announced.
+ * or <= 0 in other cases.
+ */
+static inline ssize_t sink_write(struct sink *sink, struct log_header hdr,
+                                 size_t maxlen, const struct ist msg[], size_t nmsg)
+{
+	ssize_t sent;
+
+	if (unlikely(sink->ctx.dropped > 0)) {
+		/* We need to take an exclusive lock so that other producers
+		 * don't do the same thing at the same time and above all we
+		 * want to be sure others have finished sending their messages
+		 * so that the dropped event arrives exactly at the right
+		 * position.
+		 */
+		HA_RWLOCK_WRLOCK(RING_LOCK, &sink->ctx.lock);
+		sent = sink_announce_dropped(sink, hdr);
+		HA_RWLOCK_WRUNLOCK(RING_LOCK, &sink->ctx.lock);
+
+		if (!sent) {
+			/* we failed, we don't try to send our log as if it
+			 * would pass by chance, we'd get disordered events.
+			 */
+			goto fail;
+		}
+	}
+
+	HA_RWLOCK_RDLOCK(RING_LOCK, &sink->ctx.lock);
+	sent = __sink_write(sink, hdr, maxlen, msg, nmsg);
+	HA_RWLOCK_RDUNLOCK(RING_LOCK, &sink->ctx.lock);
+
+ fail:
+	if (unlikely(sent <= 0))
+		HA_ATOMIC_INC(&sink->ctx.dropped);
+
+	return sent;
+}
+
+struct sink *sink_new_from_srv(struct server *srv, const char *from);
+int sink_resolve_logger_buffer(struct logger *logger, char **msg);
+
+#endif /* _HAPROXY_SINK_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */