1 files changed, 607 insertions, 0 deletions
diff --git a/ctdb/client/client_message.c b/ctdb/client/client_message.c
new file mode 100644
index 0000000..c2e975a
--- /dev/null
+++ b/ctdb/client/client_message.c
@@ -0,0 +1,607 @@
+/*
+   CTDB client code
+
+   Copyright (C) Amitay Isaacs  2015
+
+   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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/network.h"
+#include "system/filesys.h"
+
+#include <talloc.h>
+#include <tevent.h>
+#include <tdb.h>
+
+#include "lib/util/tevent_unix.h"
+
+#include "common/reqid.h"
+#include "common/srvid.h"
+#include "common/comm.h"
+
+#include "protocol/protocol.h"
+#include "protocol/protocol_api.h"
+
+#include "client/client_private.h"
+#include "client/client.h"
+
+
+/*
+ * Handle REQ_MESSAGE
+ */
+
+struct ctdb_client_message_state {
+	struct ctdb_client_context *client;
+	uint32_t reqid;
+};
+
+static int ctdb_client_message_state_destructor(
+	struct ctdb_client_message_state *state);
+static void ctdb_client_message_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_client_message_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct ctdb_client_context *client,
+					    uint32_t destnode,
+					    struct ctdb_req_message *message)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_client_message_state *state;
+	struct ctdb_req_header h;
+	uint32_t reqid;
+	uint8_t *buf;
+	size_t datalen, buflen;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_client_message_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	reqid = reqid_new(client->idr, state);
+	if (reqid == REQID_INVALID) {
+		talloc_free(req);
+		return NULL;
+	}
+
+	state->client = client;
+	state->reqid = reqid;
+
+	talloc_set_destructor(state, ctdb_client_message_state_destructor);
+
+	ctdb_req_header_fill(&h, 0, CTDB_REQ_MESSAGE, destnode,
+			     client->pnn, reqid);
+
+	datalen = ctdb_req_message_len(&h, message);
+	ret = ctdb_allocate_pkt(state, datalen, &buf, &buflen);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	ret = ctdb_req_message_push(&h, message, buf, &buflen);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = comm_write_send(state, ev, client->comm, buf, buflen);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_client_message_done, req);
+
+	return req;
+}
+
+static int ctdb_client_message_state_destructor(
+	struct ctdb_client_message_state *state)
+{
+	reqid_remove(state->client->idr, state->reqid);
+	return 0;
+}
+
+static void ctdb_client_message_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	int ret;
+	bool status;
+
+	status = comm_write_recv(subreq, &ret);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+bool ctdb_client_message_recv(struct tevent_req *req, int *perr)
+{
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		if (perr != NULL) {
+			*perr = err;
+		}
+		return false;
+	}
+
+	return true;
+}
+
+void ctdb_client_req_message(struct ctdb_client_context *client,
+			     uint8_t *buf, size_t buflen, uint32_t reqid)
+{
+	struct ctdb_req_header h;
+	struct ctdb_req_message_data message;
+	TALLOC_CTX *tmp_ctx = talloc_new(client);
+	int ret;
+
+	ret = ctdb_req_message_data_pull(buf, buflen, &h, tmp_ctx, &message);
+	if (ret != 0) {
+		return;
+	}
+
+	srvid_dispatch(client->srv, message.srvid, CTDB_SRVID_ALL,
+		       message.data);
+	talloc_free(tmp_ctx);
+}
+
+/*
+ * Handle multiple nodes
+ */
+
+struct ctdb_client_message_multi_state {
+	uint32_t *pnn_list;
+	int count;
+	int done;
+	int err;
+	int *err_list;
+};
+
+struct message_index_state {
+	struct tevent_req *req;
+	int index;
+};
+
+static void ctdb_client_message_multi_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_client_message_multi_send(
+				TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct ctdb_client_context *client,
+				uint32_t *pnn_list, int count,
+				struct ctdb_req_message *message)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_client_message_multi_state *state;
+	int i;
+
+	if (pnn_list == NULL || count == 0) {
+		return NULL;
+	}
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_client_message_multi_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->pnn_list = pnn_list;
+	state->count = count;
+	state->done = 0;
+	state->err = 0;
+	state->err_list = talloc_zero_array(state, int, count);
+	if (tevent_req_nomem(state->err_list, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	for (i=0; i<count; i++) {
+		struct message_index_state *substate;
+
+		subreq = ctdb_client_message_send(state, ev, client,
+						  pnn_list[i], message);
+		if (tevent_req_nomem(subreq, req)) {
+			return tevent_req_post(req, ev);
+		}
+
+		substate = talloc(subreq, struct message_index_state);
+		if (tevent_req_nomem(substate, req)) {
+			return tevent_req_post(req, ev);
+		}
+
+		substate->req = req;
+		substate->index = i;
+
+		tevent_req_set_callback(subreq, ctdb_client_message_multi_done,
+					substate);
+	}
+
+	return req;
+}
+
+static void ctdb_client_message_multi_done(struct tevent_req *subreq)
+{
+	struct message_index_state *substate = tevent_req_callback_data(
+		subreq, struct message_index_state);
+	struct tevent_req *req = substate->req;
+	int idx = substate->index;
+	struct ctdb_client_message_multi_state *state = tevent_req_data(
+		req, struct ctdb_client_message_multi_state);
+	bool status;
+	int ret;
+
+	status = ctdb_client_message_recv(subreq, &ret);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		if (state->err == 0) {
+			state->err = ret;
+			state->err_list[idx] = state->err;
+		}
+	}
+
+	state->done += 1;
+
+	if (state->done == state->count) {
+		tevent_req_done(req);
+	}
+}
+
+bool ctdb_client_message_multi_recv(struct tevent_req *req, int *perr,
+				    TALLOC_CTX *mem_ctx, int **perr_list)
+{
+	struct ctdb_client_message_multi_state *state = tevent_req_data(
+		req, struct ctdb_client_message_multi_state);
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		if (perr != NULL) {
+			*perr = err;
+		}
+		if (perr_list != NULL) {
+			*perr_list = talloc_steal(mem_ctx, state->err_list);
+		}
+		return false;
+	}
+
+	if (perr != NULL) {
+		*perr = state->err;
+	}
+
+	if (perr_list != NULL) {
+		*perr_list = talloc_steal(mem_ctx, state->err_list);
+	}
+
+	if (state->err != 0) {
+		return false;
+	}
+
+	return true;
+}
+
+/*
+ * sync version of message send
+ */
+
+int ctdb_client_message(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+			struct ctdb_client_context *client,
+			uint32_t destnode, struct ctdb_req_message *message)
+{
+	TALLOC_CTX *tmp_ctx;
+	struct tevent_req *req;
+	int ret;
+	bool status;
+
+	tmp_ctx = talloc_new(client);
+	if (tmp_ctx == NULL) {
+		return ENOMEM;
+	}
+
+	req = ctdb_client_message_send(tmp_ctx, ev, client, destnode, message);
+	if (req == NULL) {
+		talloc_free(tmp_ctx);
+		return ENOMEM;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_client_message_recv(req, &ret);
+	if (! status) {
+		talloc_free(tmp_ctx);
+		return ret;
+	}
+
+	talloc_free(tmp_ctx);
+	return 0;
+}
+
+int ctdb_client_message_multi(TALLOC_CTX *mem_ctx,
+			      struct tevent_context *ev,
+			      struct ctdb_client_context *client,
+			      uint32_t *pnn_list, int count,
+			      struct ctdb_req_message *message,
+			      int **perr_list)
+{
+	struct tevent_req *req;
+	bool status;
+	int ret;
+
+	req = ctdb_client_message_multi_send(mem_ctx, ev, client,
+					     pnn_list, count,
+					     message);
+	if (req == NULL) {
+		return ENOMEM;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_client_message_multi_recv(req, &ret, mem_ctx, perr_list);
+	if (! status) {
+		return ret;
+	}
+
+	return 0;
+}
+
+struct ctdb_client_set_message_handler_state {
+	struct ctdb_client_context *client;
+	uint64_t srvid;
+	srvid_handler_fn handler;
+	void *private_data;
+};
+
+static void ctdb_client_set_message_handler_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_client_set_message_handler_send(
+					TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct ctdb_client_context *client,
+					uint64_t srvid,
+					srvid_handler_fn handler,
+					void *private_data)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_client_set_message_handler_state *state;
+	struct ctdb_req_control request;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_client_set_message_handler_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->client = client;
+	state->srvid = srvid;
+	state->handler = handler;
+	state->private_data = private_data;
+
+	ctdb_req_control_register_srvid(&request, srvid);
+	subreq = ctdb_client_control_send(state, ev, client, client->pnn,
+					  tevent_timeval_zero(), &request);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, ctdb_client_set_message_handler_done,
+				req);
+
+	return req;
+}
+
+static void ctdb_client_set_message_handler_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_client_set_message_handler_state *state = tevent_req_data(
+		req, struct ctdb_client_set_message_handler_state);
+	struct ctdb_reply_control *reply;
+	bool status;
+	int ret;
+
+	status = ctdb_client_control_recv(subreq, &ret, state, &reply);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ret = ctdb_reply_control_register_srvid(reply);
+	talloc_free(reply);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ret = srvid_register(state->client->srv, state->client, state->srvid,
+			     state->handler, state->private_data);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+bool ctdb_client_set_message_handler_recv(struct tevent_req *req, int *perr)
+{
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		if (perr != NULL) {
+			*perr = err;
+		}
+		return false;
+	}
+	return true;
+}
+
+struct ctdb_client_remove_message_handler_state {
+	struct ctdb_client_context *client;
+	uint64_t srvid;
+	void *private_data;
+};
+
+static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_client_remove_message_handler_send(
+					TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct ctdb_client_context *client,
+					uint64_t srvid,
+					void *private_data)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_client_remove_message_handler_state *state;
+	struct ctdb_req_control request;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_client_remove_message_handler_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->client = client;
+	state->srvid = srvid;
+	state->private_data = private_data;
+
+	ctdb_req_control_deregister_srvid(&request, srvid);
+	subreq = ctdb_client_control_send(state, ev, client, client->pnn,
+					  tevent_timeval_zero(), &request);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq,
+				ctdb_client_remove_message_handler_done, req);
+
+	return req;
+}
+
+static void ctdb_client_remove_message_handler_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_client_remove_message_handler_state *state = tevent_req_data(
+		req, struct ctdb_client_remove_message_handler_state);
+	struct ctdb_reply_control *reply;
+	bool status;
+	int ret;
+
+	status = ctdb_client_control_recv(subreq, &ret, state, &reply);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ret = ctdb_reply_control_deregister_srvid(reply);
+	talloc_free(reply);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	ret = srvid_deregister(state->client->srv, state->srvid,
+			       state->private_data);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+bool ctdb_client_remove_message_handler_recv(struct tevent_req *req, int *perr)
+{
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		if (perr != NULL) {
+			*perr = err;
+		}
+		return false;
+	}
+	return true;
+}
+
+int ctdb_client_set_message_handler(struct tevent_context *ev,
+				    struct ctdb_client_context *client,
+				    uint64_t srvid, srvid_handler_fn handler,
+				    void *private_data)
+{
+	TALLOC_CTX *mem_ctx;
+	struct tevent_req *req;
+	int ret;
+	bool status;
+
+	mem_ctx = talloc_new(client);
+	if (mem_ctx == NULL) {
+		return ENOMEM;
+	}
+
+	req = ctdb_client_set_message_handler_send(mem_ctx, ev, client,
+						   srvid, handler,
+						   private_data);
+	if (req == NULL) {
+		talloc_free(mem_ctx);
+		return ENOMEM;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_client_set_message_handler_recv(req, &ret);
+	if (! status) {
+		talloc_free(mem_ctx);
+		return ret;
+	}
+
+	talloc_free(mem_ctx);
+	return 0;
+}
+
+int ctdb_client_remove_message_handler(struct tevent_context *ev,
+				       struct ctdb_client_context *client,
+				       uint64_t srvid, void *private_data)
+{
+	TALLOC_CTX *mem_ctx;
+	struct tevent_req *req;
+	int ret;
+	bool status;
+
+	mem_ctx = talloc_new(client);
+	if (mem_ctx == NULL) {
+		return ENOMEM;
+	}
+
+	req = ctdb_client_remove_message_handler_send(mem_ctx, ev, client,
+						      srvid, private_data);
+	if (req == NULL) {
+		talloc_free(mem_ctx);
+		return ENOMEM;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_client_remove_message_handler_recv(req, &ret);
+	if (! status) {
+		talloc_free(mem_ctx);
+		return ret;
+	}
+
+	talloc_free(mem_ctx);
+	return 0;
+}