1 files changed, 138 insertions, 0 deletions
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_membership_service.h b/wsrep-lib/wsrep-API/v26/wsrep_membership_service.h
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+++ b/wsrep-lib/wsrep-API/v26/wsrep_membership_service.h
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2020 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-API.
+ *
+ * Wsrep-API 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.
+ *
+ * Wsrep-API 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 wsrep-API.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file wsrep_membership_service.h
+ *
+ * This file defines interface for quering the immediate membership and
+ * members' states of the current configuration. The information is provided
+ * OUT OF ORDER to facilitate administrative tasks.
+ *
+ * The provider which is capable of using the service interface v1 must
+ * export the following functions.
+ *
+ * int wsrep_init_membership_service_v1(struct wsrep_membership_service_v1*)
+ * void wsrep_deinit_membership_service_v1()
+ *
+ * which can be probed by the application.
+ *
+ * The application must initialize the service via above init function
+ * before the provider is initialized via wsrep->init(). The deinit
+ * function must be called after the provider side resources have been
+ * released via wsrep->free().
+ */
+
+#ifndef WSREP_MEMBERSHIP_SERVICE_H
+#define WSREP_MEMBERSHIP_SERVICE_H
+
+#include "wsrep_api.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/**
+ * Member info structure extended to contain member state
+ */
+struct wsrep_member_info_ext
+{
+    struct wsrep_member_info base;
+    wsrep_seqno_t            last_committed;
+    enum wsrep_member_status status;
+};
+
+/**
+ * Extended membership structure
+ */
+struct wsrep_membership
+{
+    /**
+     * Epoch of the membership data (last time it was updated)
+     */
+    wsrep_uuid_t group_uuid;
+    /**
+     * Sequence number of the last received (not processed) action
+     */
+    wsrep_seqno_t last_received;
+    /**
+     * When the members' data was last updated
+     */
+    wsrep_seqno_t updated;
+    /**
+     * Current group state
+     */
+    enum wsrep_view_status state;
+    /**
+     * Number of members in the array
+     */
+    size_t num;
+    /**
+     * Membership array
+     */
+    struct wsrep_member_info_ext members[1];
+};
+
+/**
+ * Memory allocation callback for wsrep_get_mmebership_fn() below
+ *
+ * @param size of buffer to allocate
+ * @return allocated buffer pointer or NULL in case of error
+ */
+typedef void* (*wsrep_allocator_cb) (size_t size);
+
+/**
+ * Query membership
+ *
+ * @param wsrep      provider handle
+ * @param allocator  to use for wsrep_membership struct allocation
+ * @param membership pointer to pointer to the memebrship structure.
+ *                   The structure is allocated by provider and must be freed
+ *                   by the caller.
+ * @return error code of the call
+ */
+typedef wsrep_status_t (*wsrep_get_membership_fn) (
+    wsrep_t* wsrep,
+    wsrep_allocator_cb allocator,
+    struct wsrep_membership** membership);
+
+/**
+ * Membership service struct.
+ * Returned by WSREP_MEMBERSHIP_SERVICE_INIT_FUNC_V1
+ */
+struct wsrep_membership_service_v1
+{
+    wsrep_get_membership_fn get_membership;
+};
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+typedef
+wsrep_status_t
+(*wsrep_membership_service_v1_init_fn) (struct wsrep_membership_service_v1*);
+typedef
+void
+(*wsrep_membership_service_v1_deinit_fn)(void);
+
+/** must be exported by the provider */
+#define WSREP_MEMBERSHIP_SERVICE_V1_INIT_FN   "wsrep_init_membership_service_v1"
+#define WSREP_MEMBERSHIP_SERVICE_V1_DEINIT_FN "wsrep_deinit_membership_service_v1"
+
+#endif /* WSREP_MEMBERSHIP_SERVICE_H */