--- /dev/null
+/*
+ ctdb daemon code
+
+ Copyright (C) Andrew Tridgell 2007
+ Copyright (C) Ronnie Sahlberg 2007
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include "includes.h"
+#include "db_wrap.h"
+#include "lib/tdb/include/tdb.h"
+#include "lib/events/events.h"
+#include "lib/util/dlinklist.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "../include/ctdb.h"
+#include "../include/ctdb_private.h"
+
+/*
+ queue a packet for sending from client to daemon
+*/
+static int ctdb_client_queue_pkt(struct ctdb_context *ctdb, struct ctdb_req_header *hdr)
+{
+ return ctdb_queue_send(ctdb->daemon.queue, (uint8_t *)hdr, hdr->length);
+}
+
+
+/*
+ this is called in the client, when data comes in from the daemon
+ */
+static void ctdb_client_read_cb(uint8_t *data, size_t cnt, void *args)
+{
+ struct ctdb_context *ctdb = talloc_get_type(args, struct ctdb_context);
+ struct ctdb_req_header *hdr;
+
+ if (cnt < sizeof(*hdr)) {
+ ctdb_set_error(ctdb, "Bad packet length %d\n", cnt);
+ return;
+ }
+ hdr = (struct ctdb_req_header *)data;
+ if (cnt != hdr->length) {
+ ctdb_set_error(ctdb, "Bad header length %d expected %d\n",
+ hdr->length, cnt);
+ return;
+ }
+
+ if (hdr->ctdb_magic != CTDB_MAGIC) {
+ ctdb_set_error(ctdb, "Non CTDB packet rejected\n");
+ return;
+ }
+
+ if (hdr->ctdb_version != CTDB_VERSION) {
+ ctdb_set_error(ctdb, "Bad CTDB version 0x%x rejected\n", hdr->ctdb_version);
+ return;
+ }
+
+ ctdb_reply_call(ctdb, hdr);
+}
+
+/*
+ connect to a unix domain socket
+*/
+static int ux_socket_connect(struct ctdb_context *ctdb)
+{
+ struct sockaddr_un addr;
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ strncpy(addr.sun_path, ctdb->daemon.name, sizeof(addr.sun_path));
+
+ ctdb->daemon.sd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (ctdb->daemon.sd == -1) {
+ return -1;
+ }
+
+ if (connect(ctdb->daemon.sd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+ close(ctdb->daemon.sd);
+ ctdb->daemon.sd = -1;
+ return -1;
+ }
+
+ ctdb->daemon.queue = ctdb_queue_setup(ctdb, ctdb, ctdb->daemon.sd,
+ CTDB_DS_ALIGNMENT,
+ ctdb_client_read_cb, ctdb);
+ return 0;
+}
+
+
+
+/*
+ make a recv call to the local ctdb daemon - called from client context
+
+ This is called when the program wants to wait for a ctdb_call to complete and get the
+ results. This call will block unless the call has already completed.
+*/
+int ctdb_client_call_recv(struct ctdb_call_state *state, struct ctdb_call *call)
+{
+ struct ctdb_record_handle *rec;
+
+ while (state->state < CTDB_CALL_DONE) {
+ event_loop_once(state->node->ctdb->ev);
+ }
+ if (state->state != CTDB_CALL_DONE) {
+ ctdb_set_error(state->node->ctdb, "%s", state->errmsg);
+ talloc_free(state);
+ return -1;
+ }
+
+ rec = state->fetch_private;
+
+ /* ugly hack to manage forced migration */
+ if (rec != NULL) {
+ rec->data->dptr = talloc_steal(rec, state->call.reply_data.dptr);
+ rec->data->dsize = state->call.reply_data.dsize;
+ talloc_free(state);
+ return 0;
+ }
+
+ if (state->call.reply_data.dsize) {
+ call->reply_data.dptr = talloc_memdup(state->node->ctdb,
+ state->call.reply_data.dptr,
+ state->call.reply_data.dsize);
+ call->reply_data.dsize = state->call.reply_data.dsize;
+ } else {
+ call->reply_data.dptr = NULL;
+ call->reply_data.dsize = 0;
+ }
+ call->status = state->call.status;
+ talloc_free(state);
+
+ return 0;
+}
+
+
+
+
+/*
+ destroy a ctdb_call in client
+*/
+static int ctdb_client_call_destructor(struct ctdb_call_state *state)
+{
+ idr_remove(state->node->ctdb->idr, state->c->hdr.reqid);
+ return 0;
+}
+
+
+
+/*
+ make a ctdb call to the local daemon - async send. Called from client context.
+
+ This constructs a ctdb_call request and queues it for processing.
+ This call never blocks.
+*/
+struct ctdb_call_state *ctdb_client_call_send(struct ctdb_db_context *ctdb_db,
+ struct ctdb_call *call)
+{
+ struct ctdb_call_state *state;
+ struct ctdb_context *ctdb = ctdb_db->ctdb;
+ struct ctdb_ltdb_header header;
+ TDB_DATA data;
+ int ret;
+ size_t len;
+
+ /* if the domain socket is not yet open, open it */
+ if (ctdb->daemon.sd==-1) {
+ ux_socket_connect(ctdb);
+ }
+
+ ret = ctdb_ltdb_lock(ctdb_db, call->key);
+ if (ret != 0) {
+ printf("failed to lock ltdb record\n");
+ return NULL;
+ }
+
+ ret = ctdb_ltdb_fetch(ctdb_db, call->key, &header, ctdb_db, &data);
+ if (ret != 0) {
+ ctdb_ltdb_unlock(ctdb_db, call->key);
+ return NULL;
+ }
+
+#if 0
+ if (header.dmaster == ctdb->vnn && !(ctdb->flags & CTDB_FLAG_SELF_CONNECT)) {
+ state = ctdb_call_local_send(ctdb_db, call, &header, &data);
+ ctdb_ltdb_unlock(ctdb_db, call->key);
+ return state;
+ }
+#endif
+
+ state = talloc_zero(ctdb_db, struct ctdb_call_state);
+ if (state == NULL) {
+ printf("failed to allocate state\n");
+ ctdb_ltdb_unlock(ctdb_db, call->key);
+ return NULL;
+ }
+
+ talloc_steal(state, data.dptr);
+
+ len = offsetof(struct ctdb_req_call, data) + call->key.dsize + call->call_data.dsize;
+ state->c = ctdbd_allocate_pkt(ctdb, len);
+ if (state->c == NULL) {
+ printf("failed to allocate packet\n");
+ ctdb_ltdb_unlock(ctdb_db, call->key);
+ return NULL;
+ }
+ talloc_set_name_const(state->c, "ctdbd req_call packet");
+ talloc_steal(state, state->c);
+
+ state->c->hdr.length = len;
+ state->c->hdr.ctdb_magic = CTDB_MAGIC;
+ state->c->hdr.ctdb_version = CTDB_VERSION;
+ state->c->hdr.operation = CTDB_REQ_CALL;
+ state->c->hdr.destnode = header.dmaster;
+ state->c->hdr.srcnode = ctdb->vnn;
+ /* this limits us to 16k outstanding messages - not unreasonable */
+ state->c->hdr.reqid = idr_get_new(ctdb->idr, state, 0xFFFF);
+ state->c->flags = call->flags;
+ state->c->db_id = ctdb_db->db_id;
+ state->c->callid = call->call_id;
+ state->c->keylen = call->key.dsize;
+ state->c->calldatalen = call->call_data.dsize;
+ memcpy(&state->c->data[0], call->key.dptr, call->key.dsize);
+ memcpy(&state->c->data[call->key.dsize],
+ call->call_data.dptr, call->call_data.dsize);
+ state->call = *call;
+ state->call.call_data.dptr = &state->c->data[call->key.dsize];
+ state->call.key.dptr = &state->c->data[0];
+
+ state->node = ctdb->nodes[header.dmaster];
+ state->state = CTDB_CALL_WAIT;
+ state->header = header;
+ state->ctdb_db = ctdb_db;
+
+ talloc_set_destructor(state, ctdb_client_call_destructor);
+
+ ctdb_client_queue_pkt(ctdb, &state->c->hdr);
+
+/*XXX set up timeout to cleanup if server doesnt respond
+ event_add_timed(ctdb->ev, state, timeval_current_ofs(CTDB_REQ_TIMEOUT, 0),
+ ctdb_call_timeout, state);
+*/
+
+ ctdb_ltdb_unlock(ctdb_db, call->key);
+ return state;
+}
projects / thirdparty / samba.git / commitdiff
