ctdb-client: Add new client API implementation

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>

1 files changed, 430 insertions, 0 deletions

diff --git a/ctdb/client/client_control.c b/ctdb/client/client_control.c
new file mode 100644
index 00000000000..4249bfbe81f
--- /dev/null
+++ b/ctdb/client/client_control.c
@@ -0,0 +1,430 @@
+/*
+   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_CONTROL and REPLY_CONTROL
+ */
+
+struct ctdb_client_control_state {
+	struct ctdb_client_context *client;
+	uint32_t opcode;
+	uint32_t flags;
+	uint32_t reqid;
+	struct ctdb_reply_control *reply;
+	struct tevent_req *req;
+};
+
+static int ctdb_client_control_state_destructor(
+	struct ctdb_client_control_state *state);
+static void ctdb_client_control_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_client_control_send(TALLOC_CTX *mem_ctx,
+					    struct tevent_context *ev,
+					    struct ctdb_client_context *client,
+					    uint32_t destnode,
+					    struct timeval timeout,
+					    struct ctdb_req_control *request)
+{
+	struct ctdb_req_header h;
+	struct tevent_req *req, *subreq;
+	struct ctdb_client_control_state *state;
+	uint32_t reqid;
+	uint8_t *buf;
+	size_t buflen;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_client_control_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->flags = request->flags;
+	state->opcode = request->opcode;
+	state->reqid = reqid;
+	state->req = req;
+	state->reply = talloc_zero(state, struct ctdb_reply_control);
+	if (tevent_req_nomem(state->reply, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	talloc_set_destructor(state, ctdb_client_control_state_destructor);
+
+	ctdb_req_header_fill(&h, 0, CTDB_REQ_CONTROL, destnode,
+			     client->pnn, reqid);
+
+	ret = ctdb_req_control_push(&h, request, state, &buf, &buflen);
+	if (ret != 0) {
+		tevent_req_error(req, ret);
+		return tevent_req_post(req, ev);
+	}
+
+	if (!tevent_timeval_is_zero(&timeout)) {
+		tevent_req_set_endtime(req, ev, timeout);
+	}
+
+	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_control_done, req);
+
+	return req;
+}
+
+static int ctdb_client_control_state_destructor(
+	struct ctdb_client_control_state *state)
+{
+	reqid_remove(state->client->idr, state->reqid);
+	return 0;
+}
+
+static void ctdb_client_control_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct ctdb_client_control_state *state = tevent_req_data(
+		req, struct ctdb_client_control_state);
+	bool status;
+	int ret;
+
+	status = comm_write_recv(subreq, &ret);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	/* Daemon will not reply, so we set status to 0 */
+	if (state->flags & CTDB_CTRL_FLAG_NOREPLY) {
+		reqid_remove(state->client->idr, state->reqid);
+		state->reply->status = 0;
+		tevent_req_done(req);
+	}
+
+	/* wait for the reply or timeout */
+}
+
+void ctdb_client_reply_control(struct ctdb_client_context *client,
+			       uint8_t *buf, size_t buflen, uint32_t reqid)
+{
+	struct ctdb_req_header h;
+	struct ctdb_client_control_state *state;
+	int ret;
+
+	state = reqid_find(client->idr, reqid,
+			   struct ctdb_client_control_state);
+	if (state == NULL) {
+		return;
+	}
+
+	if (reqid != state->reqid) {
+		return;
+	}
+
+	ret = ctdb_reply_control_pull(buf, buflen, state->opcode, &h,
+				      state->reply, state->reply);
+	if (ret != 0) {
+		tevent_req_error(state->req, ret);
+		return;
+	}
+
+	tevent_req_done(state->req);
+}
+
+bool ctdb_client_control_recv(struct tevent_req *req, int *perr,
+			      TALLOC_CTX *mem_ctx,
+			      struct ctdb_reply_control **reply)
+{
+	struct ctdb_client_control_state *state = tevent_req_data(
+		req, struct ctdb_client_control_state);
+	int err;
+
+	if (tevent_req_is_unix_error(req, &err)) {
+		if (perr != NULL) {
+			*perr = err;
+		}
+		return false;
+	}
+
+	if (reply != NULL) {
+		*reply = talloc_steal(mem_ctx, state->reply);
+	}
+
+	return true;
+}
+
+/*
+ * Handle multiple nodes - there cannot be any return data
+ */
+
+struct ctdb_client_control_multi_state {
+	uint32_t *pnn_list;
+	int count;
+	int done;
+	int err;
+	int *err_list;
+	struct ctdb_reply_control **reply;
+};
+
+struct control_index_state {
+	struct tevent_req *req;
+	int index;
+};
+
+static void ctdb_client_control_multi_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_client_control_multi_send(
+				TALLOC_CTX *mem_ctx,
+				struct tevent_context *ev,
+				struct ctdb_client_context *client,
+				uint32_t *pnn_list, int count,
+				struct timeval timeout,
+				struct ctdb_req_control *request)
+{
+	struct tevent_req *req, *subreq;
+	struct ctdb_client_control_multi_state *state;
+	int i;
+
+	if (pnn_list == NULL || count == 0) {
+		return NULL;
+	}
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct ctdb_client_control_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);
+	}
+	state->reply = talloc_zero_array(state, struct ctdb_reply_control *,
+					 count);
+	if (tevent_req_nomem(state->reply, req)) {
+		return tevent_req_post(req, ev);
+	}
+
+	for (i=0; i<count; i++) {
+		struct control_index_state *substate;
+
+		subreq = ctdb_client_control_send(state, ev, client,
+						  pnn_list[i], timeout,
+						  request);
+		if (tevent_req_nomem(subreq, req)) {
+			return tevent_req_post(req, ev);
+		}
+
+		substate = talloc(subreq, struct control_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_control_multi_done,
+					substate);
+	}
+
+	return req;
+}
+
+static void ctdb_client_control_multi_done(struct tevent_req *subreq)
+{
+	struct control_index_state *substate = tevent_req_callback_data(
+		subreq, struct control_index_state);
+	struct tevent_req *req = substate->req;
+	int idx = substate->index;
+	struct ctdb_client_control_multi_state *state = tevent_req_data(
+		req, struct ctdb_client_control_multi_state);
+	bool status;
+	int ret;
+
+	status = ctdb_client_control_recv(subreq, &ret, state->reply,
+					  &state->reply[idx]);
+	TALLOC_FREE(subreq);
+	if (! status) {
+		if (state->err == 0) {
+			state->err = ret;
+			state->err_list[idx] = state->err;
+		}
+	} else {
+		if (state->reply[idx]->status != 0) {
+			if (state->err == 0) {
+				state->err = state->reply[idx]->status;
+				state->err_list[idx] = state->err;
+			}
+		}
+	}
+
+	state->done += 1;
+
+	if (state->done == state->count) {
+		tevent_req_done(req);
+	}
+}
+
+bool ctdb_client_control_multi_recv(struct tevent_req *req, int *perr,
+				    TALLOC_CTX *mem_ctx, int **perr_list,
+				    struct ctdb_reply_control ***preply)
+{
+	struct ctdb_client_control_multi_state *state = tevent_req_data(
+		req, struct ctdb_client_control_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 (preply != NULL) {
+		*preply = talloc_steal(mem_ctx, state->reply);
+	}
+
+	if (state->err != 0) {
+		return false;
+	}
+
+	return true;
+}
+
+int ctdb_client_control_multi_error(uint32_t *pnn_list, int count,
+				    int *err_list, uint32_t *pnn)
+{
+	int ret = 0, i;
+
+	for (i=0; i<count; i++) {
+		if (err_list[i] != 0) {
+			ret = err_list[i];
+			*pnn = pnn_list[i];
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * Sync version of control send/recv
+ */
+
+int ctdb_client_control(TALLOC_CTX *mem_ctx,
+			struct tevent_context *ev,
+			struct ctdb_client_context *client,
+			uint32_t destnode,
+			struct timeval timeout,
+			struct ctdb_req_control *request,
+			struct ctdb_reply_control **reply)
+{
+	struct tevent_req *req;
+	int ret;
+	bool status;
+
+	req = ctdb_client_control_send(mem_ctx, ev, client, destnode, timeout,
+				       request);
+	if (req == NULL) {
+		return ENOMEM;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_client_control_recv(req, &ret, mem_ctx, reply);
+	if (! status) {
+		return ret;
+	}
+
+	return 0;
+}
+
+int ctdb_client_control_multi(TALLOC_CTX *mem_ctx,
+			      struct tevent_context *ev,
+			      struct ctdb_client_context *client,
+			      uint32_t *pnn_list, int count,
+			      struct timeval timeout,
+			      struct ctdb_req_control *request,
+			      int **perr_list,
+			      struct ctdb_reply_control ***preply)
+{
+	struct tevent_req *req;
+	bool status;
+	int ret;
+
+	req = ctdb_client_control_multi_send(mem_ctx, ev, client,
+					     pnn_list, count,
+					     timeout, request);
+	if (req == NULL) {
+		return ENOMEM;
+	}
+
+	tevent_req_poll(req, ev);
+
+	status = ctdb_client_control_multi_recv(req, &ret, mem_ctx, perr_list,
+						preply);
+	if (! status) {
+		return ret;
+	}
+
+	return 0;
+}