1 files changed, 154 insertions, 0 deletions
diff --git a/src/replication/aggregator/notify-connection.c b/src/replication/aggregator/notify-connection.c
new file mode 100644
index 0000000..f9587fe
--- /dev/null
+++ b/src/replication/aggregator/notify-connection.c
@@ -0,0 +1,154 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "llist.h"
+#include "strescape.h"
+#include "master-service.h"
+#include "replication-common.h"
+#include "replicator-connection.h"
+#include "notify-connection.h"
+
+#define MAX_INBUF_SIZE 8192
+
+#define CONNECTION_IS_FIFO(conn) \
+	((conn)->output == NULL)
+
+struct notify_connection {
+	struct notify_connection *prev, *next;
+	int refcount;
+
+	int fd;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+};
+
+static struct notify_connection *conns = NULL;
+
+static void notify_connection_unref(struct notify_connection *conn);
+static void notify_connection_destroy(struct notify_connection *conn);
+
+static bool notify_input_error(struct notify_connection *conn)
+{
+	if (CONNECTION_IS_FIFO(conn))
+		return TRUE;
+	notify_connection_destroy(conn);
+	return FALSE;
+}
+
+void notify_connection_sync_callback(bool success, void *context)
+{
+	struct notify_connection *conn = context;
+
+	o_stream_nsend_str(conn->output, success ? "+\n" : "-\n");
+	notify_connection_unref(conn);
+}
+
+static int
+notify_input_line(struct notify_connection *conn, const char *line)
+{
+	const char *const *args;
+	enum replication_priority priority;
+
+	/* <username> \t <priority> */
+	args = t_strsplit_tabescaped(line);
+	if (str_array_length(args) < 2) {
+		i_error("Client sent invalid input");
+		return -1;
+	}
+	if (replication_priority_parse(args[1], &priority) < 0) {
+		i_error("Client sent invalid priority: %s", args[1]);
+		return -1;
+	}
+	if (priority != REPLICATION_PRIORITY_SYNC)
+		replicator_connection_notify(replicator, args[0], priority);
+	else {
+		conn->refcount++;
+		replicator_connection_notify_sync(replicator, args[0], conn);
+	}
+	return 0;
+}
+
+static void notify_input(struct notify_connection *conn)
+{
+	const char *line;
+	int ret;
+
+	switch (i_stream_read(conn->input)) {
+	case -2:
+		/* buffer full */
+		i_error("Client sent too long line");
+		(void)notify_input_error(conn);
+		return;
+	case -1:
+		/* disconnected */
+		notify_connection_destroy(conn);
+		return;
+	}
+
+	while ((line = i_stream_next_line(conn->input)) != NULL) {
+		T_BEGIN {
+			ret = notify_input_line(conn, line);
+		} T_END;
+		if (ret < 0) {
+			if (!notify_input_error(conn))
+				return;
+		}
+	}
+}
+
+void notify_connection_create(int fd, bool fifo)
+{
+	struct notify_connection *conn;
+
+	conn = i_new(struct notify_connection, 1);
+	conn->refcount = 1;
+	conn->fd = fd;
+	conn->io = io_add(fd, IO_READ, notify_input, conn);
+	conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
+	if (!fifo) {
+		conn->output = o_stream_create_fd(fd, SIZE_MAX);
+		o_stream_set_no_error_handling(conn->output, TRUE);
+	}
+
+	DLLIST_PREPEND(&conns, conn);
+}
+
+static void notify_connection_unref(struct notify_connection *conn)
+{
+	i_assert(conn->refcount > 0);
+	if (--conn->refcount > 0)
+		return;
+
+	i_stream_destroy(&conn->input);
+	o_stream_destroy(&conn->output);
+	i_free(conn);
+}
+
+static void notify_connection_destroy(struct notify_connection *conn)
+{
+	i_assert(conn->fd != -1);
+
+	if (!CONNECTION_IS_FIFO(conn))
+		master_service_client_connection_destroyed(master_service);
+
+	DLLIST_REMOVE(&conns, conn);
+
+	io_remove(&conn->io);
+	i_stream_close(conn->input);
+	o_stream_close(conn->output);
+	net_disconnect(conn->fd);
+	conn->fd = -1;
+
+	notify_connection_unref(conn);
+}
+
+void notify_connections_destroy_all(void)
+{
+	while (conns != NULL)
+		notify_connection_destroy(conns);
+}