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/*
Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS 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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef __RPC_CLNT_H
#define __RPC_CLNT_H
#include "stack.h"
#include "rpc-transport.h"
#include "timer.h"
#include "xdr-common.h"
typedef enum {
RPC_CLNT_CONNECT,
RPC_CLNT_DISCONNECT,
RPC_CLNT_MSG
} rpc_clnt_event_t;
#define AUTH_GLUSTERFS 5
#define RPC_CLNT_MAX_AUTH_BYTES 1024
struct xptr_clnt;
struct rpc_req;
struct rpc_clnt;
struct rpc_clnt_config;
struct rpc_clnt_program;
typedef int (*rpc_clnt_notify_t) (struct rpc_clnt *rpc, void *mydata,
rpc_clnt_event_t fn, void *data);
typedef int (*fop_cbk_fn_t) (struct rpc_req *req, struct iovec *iov, int count,
void *myframe);
typedef int (*clnt_fn_t) (call_frame_t *fr, xlator_t *xl, void *args);
struct saved_frame {
union {
struct list_head list;
struct {
struct saved_frame *frame_next;
struct saved_frame *frame_prev;
};
};
void *capital_this;
void *frame;
struct timeval saved_at;
struct rpc_req *rpcreq;
rpc_transport_rsp_t rsp;
};
struct saved_frames {
int64_t count;
struct saved_frame sf;
};
/* Initialized by procnum */
typedef struct rpc_clnt_procedure {
char *procname;
clnt_fn_t fn;
} rpc_clnt_procedure_t;
typedef struct rpc_clnt_program {
char *progname;
int prognum;
int progver;
rpc_clnt_procedure_t *proctable;
char **procnames;
int numproc;
} rpc_clnt_prog_t;
typedef int (*rpcclnt_cb_fn) (void *data);
/* The descriptor for each procedure/actor that runs
* over the RPC service.
*/
typedef struct rpcclnt_actor_desc {
char procname[32];
int procnum;
rpcclnt_cb_fn actor;
} rpcclnt_cb_actor_t;
/* Describes a program and its version along with the function pointers
* required to handle the procedures/actors of each program/version.
* Never changed ever by any thread so no need for a lock.
*/
typedef struct rpcclnt_cb_program {
char progname[32];
int prognum;
int progver;
rpcclnt_cb_actor_t *actors; /* All procedure handlers */
int numactors; /* Num actors in actor array */
/* Program specific state handed to actors */
void *private;
/* list member to link to list of registered services with rpc_clnt */
struct list_head program;
} rpcclnt_cb_program_t;
#define RPC_MAX_AUTH_BYTES 400
typedef struct rpc_auth_data {
int flavour;
int datalen;
char authdata[RPC_MAX_AUTH_BYTES];
} rpc_auth_data_t;
struct rpc_clnt_config {
int rpc_timeout;
int remote_port;
char * remote_host;
};
#define rpc_auth_flavour(au) ((au).flavour)
struct rpc_clnt_connection {
pthread_mutex_t lock;
rpc_transport_t *trans;
struct rpc_clnt_config config;
gf_timer_t *reconnect;
gf_timer_t *timer;
gf_timer_t *ping_timer;
struct rpc_clnt *rpc_clnt;
char connected;
struct saved_frames *saved_frames;
int32_t frame_timeout;
struct timeval last_sent;
struct timeval last_received;
int32_t ping_started;
};
typedef struct rpc_clnt_connection rpc_clnt_connection_t;
struct rpc_req {
rpc_clnt_connection_t *conn;
uint32_t xid;
struct iovec req[2];
int reqcnt;
struct iobref *req_iobref;
struct iovec rsp[2];
int rspcnt;
struct iobref *rsp_iobref;
int rpc_status;
rpc_auth_data_t verf;
rpc_clnt_prog_t *prog;
int procnum;
fop_cbk_fn_t cbkfn;
void *conn_private;
};
struct rpc_clnt {
pthread_mutex_t lock;
rpc_clnt_notify_t notifyfn;
rpc_clnt_connection_t conn;
void *mydata;
uint64_t xid;
/* list of cb programs registered with rpc-clnt */
struct list_head programs;
/* Memory pool for rpc_req_t */
struct mem_pool *reqpool;
struct mem_pool *saved_frames_pool;
glusterfs_ctx_t *ctx;
int refcount;
};
struct rpc_clnt * rpc_clnt_init (struct rpc_clnt_config *config,
dict_t *options, glusterfs_ctx_t *ctx,
char *name);
int rpc_clnt_register_notify (struct rpc_clnt *rpc, rpc_clnt_notify_t fn,
void *mydata);
/* Some preconditions related to vectors holding responses.
* @rsphdr: should contain pointer to buffer which can hold response header
* and length of the program header. In case of procedures whose
* respnose size is not bounded (eg., glusterfs lookup), the length
* should be equal to size of buffer.
* @rsp_payload: should contain pointer and length of the bu
*
* 1. Both @rsp_hdr and @rsp_payload are optional.
* 2. The user of rpc_clnt_submit, if wants response hdr and payload in its own
* buffers, then it has to populate @rsphdr and @rsp_payload.
* 3. when @rsp_payload is not NULL, @rsphdr should
* also be filled with pointer to buffer to hold header and length
* of the header.
*/
int rpc_clnt_submit (struct rpc_clnt *rpc, rpc_clnt_prog_t *prog,
int procnum, fop_cbk_fn_t cbkfn,
struct iovec *proghdr, int proghdrcount,
struct iovec *progpayload, int progpayloadcount,
struct iobref *iobref, void *frame, struct iovec *rsphdr,
int rsphdr_count, struct iovec *rsp_payload,
int rsp_payload_count, struct iobref *rsp_iobref);
struct rpc_clnt *
rpc_clnt_ref (struct rpc_clnt *rpc);
struct rpc_clnt *
rpc_clnt_unref (struct rpc_clnt *rpc);
void rpc_clnt_set_connected (rpc_clnt_connection_t *conn);
void rpc_clnt_unset_connected (rpc_clnt_connection_t *conn);
void rpc_clnt_reconnect (void *trans_ptr);
void rpc_clnt_reconfig (struct rpc_clnt *rpc, struct rpc_clnt_config *config);
/* All users of RPC services should use this API to register their
* procedure handlers.
*/
int rpcclnt_cbk_program_register (struct rpc_clnt *svc,
rpcclnt_cb_program_t *program);
#endif /* !_RPC_CLNT_H */
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