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-rw-r--r--ctdb/event/event_request.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/ctdb/event/event_request.c b/ctdb/event/event_request.c
new file mode 100644
index 0000000..303e735
--- /dev/null
+++ b/ctdb/event/event_request.c
@@ -0,0 +1,217 @@
+/*
+ CTDB event daemon - handle requests
+
+ Copyright (C) Amitay Isaacs 2018
+
+ 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 "lib/util/debug.h"
+#include "lib/util/tevent_unix.h"
+
+#include "common/logging.h"
+
+#include "event/event_private.h"
+#include "event/event_protocol_api.h"
+
+struct event_request_state {
+ struct ctdb_event_request *request;
+ struct ctdb_event_reply *reply;
+};
+
+static void event_request_done(struct tevent_req *subreq);
+
+static struct tevent_req *event_request_send(
+ TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct event_context *eventd,
+ struct ctdb_event_header *header,
+ struct ctdb_event_request *request)
+{
+ struct tevent_req *req, *subreq;
+ struct event_request_state *state;
+
+ req = tevent_req_create(mem_ctx, &state, struct event_request_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ state->request = request;
+
+ subreq = event_cmd_dispatch_send(state, ev, eventd, request);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, event_request_done, req);
+
+ return req;
+}
+
+static void event_request_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct event_request_state *state = tevent_req_data(
+ req, struct event_request_state);
+ int ret;
+ bool ok;
+
+ ok = event_cmd_dispatch_recv(subreq, &ret, state, &state->reply);
+ TALLOC_FREE(subreq);
+ if (!ok) {
+ D_ERR("Command %s failed, ret=%d\n",
+ ctdb_event_command_to_string(state->request->cmd), ret);
+
+ state->reply = talloc_zero(state, struct ctdb_event_reply);
+ if (tevent_req_nomem(state->reply, req)) {
+ return;
+ }
+
+ state->reply->cmd = state->request->cmd;
+ state->reply->result = EIO;
+ }
+
+ tevent_req_done(req);
+}
+
+static bool event_request_recv(struct tevent_req *req,
+ int *perr,
+ TALLOC_CTX *mem_ctx,
+ struct ctdb_event_reply **reply)
+{
+ struct event_request_state *state = tevent_req_data(
+ req, struct event_request_state);
+
+ if (tevent_req_is_unix_error(req, perr)) {
+ return false;
+ }
+
+ *reply = talloc_steal(mem_ctx, state->reply);
+
+ return true;
+}
+
+struct event_pkt_state {
+ struct ctdb_event_header header;
+ struct ctdb_event_request *request;
+ uint8_t *buf;
+ size_t buflen;
+};
+
+static void event_pkt_done(struct tevent_req *subreq);
+
+struct tevent_req *event_pkt_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct event_context *eventd,
+ uint8_t *buf,
+ size_t buflen)
+{
+ struct tevent_req *req, *subreq;
+ struct event_pkt_state *state;
+ int ret;
+
+ req = tevent_req_create(mem_ctx, &state, struct event_pkt_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ ret = ctdb_event_request_pull(buf,
+ buflen,
+ &state->header,
+ state,
+ &state->request);
+ if (ret != 0) {
+ /* Ignore invalid packets */
+ D_ERR("Invalid packet received, buflen=%zu\n", buflen);
+ tevent_req_error(req, EPROTO);
+ return tevent_req_post(req, ev);
+ }
+
+ subreq = event_request_send(state,
+ ev,
+ eventd,
+ &state->header,
+ state->request);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, event_pkt_done, req);
+
+ return req;
+}
+
+static void event_pkt_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct event_pkt_state *state = tevent_req_data(
+ req, struct event_pkt_state);
+ struct ctdb_event_header header;
+ struct ctdb_event_reply *reply;
+ int ret;
+ bool ok;
+
+ ok = event_request_recv(subreq, &ret, state, &reply);
+ TALLOC_FREE(subreq);
+ TALLOC_FREE(state->request);
+ if (!ok) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ header = (struct ctdb_event_header) {
+ .reqid = state->header.reqid,
+ };
+
+ state->buflen = ctdb_event_reply_len(&header, reply);
+ state->buf = talloc_zero_size(state, state->buflen);
+ if (tevent_req_nomem(state->buf, req)) {
+ talloc_free(reply);
+ return;
+ }
+
+ ret = ctdb_event_reply_push(&header,
+ reply,
+ state->buf,
+ &state->buflen);
+ talloc_free(reply);
+ if (ret != 0) {
+ talloc_free(state->buf);
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ tevent_req_done(req);
+}
+
+bool event_pkt_recv(struct tevent_req *req,
+ int *perr,
+ TALLOC_CTX *mem_ctx,
+ uint8_t **buf,
+ size_t *buflen)
+{
+ struct event_pkt_state *state = tevent_req_data(
+ req, struct event_pkt_state);
+
+ if (tevent_req_is_unix_error(req, perr)) {
+ return false;
+ }
+
+ *buf = talloc_steal(mem_ctx, state->buf);
+ *buflen = state->buflen;
+
+ return true;
+}