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samba-mirror/ctdb/include/ctdb_private.h
Andrew Tridgell ec5d2ddd8e - added ctdb_set_flags() call
- added --self-connect option to ctdb_test, allowing testing when a
  node connects to itself. not as efficient as local bypass, but very
  useful for testing purposes (easier to work with 1 task in gdb than
  2)

- split the ctdb_call() into an async triple, in the style of Samba4
  async functions. So we now have ctdb_call_send(), ctdb_call_recv()
  and ctdb_call().

- added the main ctdb_call protocol logic. No error checking yet, but
  seems to work for simple cases

- ensure we initialise the length argument to getsockopt()

(This used to be ctdb commit 95fad717ef5ab93be3603aa11d2878876fe868d3)
2006-12-01 15:45:24 +11:00

144 lines
3.8 KiB
C

/*
ctdb database library
Copyright (C) Andrew Tridgell 2006
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
*/
/*
an installed ctdb remote call
*/
struct ctdb_registered_call {
struct ctdb_registered_call *next, *prev;
uint32_t id;
ctdb_fn_t fn;
};
/*
this address structure might need to be generalised later for some
transports
*/
struct ctdb_address {
const char *address;
int port;
};
/*
state associated with one node
*/
struct ctdb_node {
struct ctdb_context *ctdb;
struct ctdb_address address;
const char *name; /* for debug messages */
void *private; /* private to transport */
uint32_t vnn;
};
/*
transport specific methods
*/
struct ctdb_methods {
int (*start)(struct ctdb_context *); /* start protocol processing */
int (*add_node)(struct ctdb_node *); /* setup a new node */
int (*queue_pkt)(struct ctdb_node *, uint8_t *data, uint32_t length);
};
/*
transport calls up to the ctdb layer
*/
struct ctdb_upcalls {
/* recv_pkt is called when a packet comes in */
void (*recv_pkt)(struct ctdb_context *, uint8_t *data, uint32_t length);
/* node_dead is called when an attempt to send to a node fails */
void (*node_dead)(struct ctdb_node *);
/* node_connected is called when a connection to a node is established */
void (*node_connected)(struct ctdb_node *);
};
/* main state of the ctdb daemon */
struct ctdb_context {
struct event_context *ev;
struct ctdb_address address;
const char *name;
uint32_t vnn; /* our own vnn */
uint32_t num_nodes;
uint32_t num_connected;
unsigned flags;
struct idr_context *idr;
struct ctdb_node **nodes; /* array of nodes in the cluster - indexed by vnn */
struct ctdb_registered_call *calls; /* list of registered calls */
char *err_msg;
struct tdb_context *ltdb;
const struct ctdb_methods *methods; /* transport methods */
const struct ctdb_upcalls *upcalls; /* transport upcalls */
void *private; /* private to transport */
};
#define CTDB_NO_MEMORY(ctdb, p) do { if (!(p)) { \
ctdb_set_error(ctdb, "Out of memory at %s:%d", __FILE__, __LINE__); \
return -1; }} while (0)
/* arbitrary maximum timeout for ctdb operations */
#define CTDB_REQ_TIMEOUT 10
/*
operation IDs
*/
enum ctdb_operation {
CTDB_REQ_CALL = 0,
CTDB_REPLY_CALL = 1
};
/*
packet structures
*/
struct ctdb_req_header {
uint32_t length;
uint32_t operation;
uint32_t destnode;
uint32_t srcnode;
uint32_t reqid;
};
struct ctdb_req_call {
struct ctdb_req_header hdr;
uint32_t callid;
uint32_t keylen;
uint32_t calldatalen;
uint8_t data[0]; /* key[] followed by calldata[] */
};
struct ctdb_reply_call {
struct ctdb_req_header hdr;
uint32_t datalen;
uint8_t data[0];
};
/* internal prototypes */
void ctdb_set_error(struct ctdb_context *ctdb, const char *fmt, ...);
bool ctdb_same_address(struct ctdb_address *a1, struct ctdb_address *a2);
int ctdb_parse_address(struct ctdb_context *ctdb,
TALLOC_CTX *mem_ctx, const char *str,
struct ctdb_address *address);
uint32_t ctdb_hash(TDB_DATA *key);
void ctdb_request_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr);
void ctdb_reply_call(struct ctdb_context *ctdb, struct ctdb_req_header *hdr);