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ctdb-client: Add client api for using tunnels

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Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
This commit is contained in:
Amitay Isaacs 2017-04-06 19:33:47 +10:00 committed by Martin Schwenke
parent c700464d23
commit ad1a9176d1
5 changed files with 920 additions and 1 deletions
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206
ctdb/client/client.h
View File

@ -41,6 +41,11 @@
*/
struct ctdb_client_context;
/**
* @brief The abstract context that holds a tunnel endpoint
*/
struct ctdb_tunnel_context;
/**
* @brief The abstract context that represents a clustered database
*/
@ -66,6 +71,17 @@ struct ctdb_transaction_handle;
*/
typedef void (*ctdb_client_callback_func_t)(void *private_data);
/**
* @brief Tunnel callback function
*
* This function is registered when a tunnel endpoint is set up. When the
* tunnel endpoint receives a message, this function is invoked.
*/
typedef void (*ctdb_tunnel_callback_func_t)(struct ctdb_tunnel_context *tctx,
uint32_t srcnode, uint32_t reqid,
uint8_t *buf, size_t buflen,
void *private_data);
/**
* @brief Initialize and connect to ctdb daemon
*
@ -544,6 +560,196 @@ int ctdb_client_control_multi(TALLOC_CTX *mem_ctx,
int ctdb_client_control_multi_error(uint32_t *pnn_list, int count,
int *err_list, uint32_t *pnn);
/**
* @brief Async computation start to setup a tunnel endpoint
*
* This computation sets up a tunnel endpoint corresponding to a tunnel_id.
* A tunnel is a ctdb transport to deliver new protocol between endpoints.
*
* For two endpoints to communicate using new protocol,
* 1. Set up tunnel endpoints
* 2. Send requests
* 3. Send replies
* 4. Destroy tunnel endpoints
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] client Client connection context
* @param[in] tunnel_id Unique tunnel id
* @param[in] callback Callback function to call when a message is received
* @param[in] private_data Private data for callback
* @return a new tevent req on success, NULL on failure
*/
struct tevent_req *ctdb_tunnel_setup_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
uint64_t tunnel_id,
ctdb_tunnel_callback_func_t callback,
void *private_data);
/**
* @brief Async computation end to setup a tunnel
*
* @param[in] req Tevent request
* @param[in] perr errno in case of failure
* @param[out] result A new tunnel context
* @return true on success, false on failure
*
* Tunnel context should never be freed by user.
*/
bool ctdb_tunnel_setup_recv(struct tevent_req *req, int *perr,
struct ctdb_tunnel_context **result);
/**
* @brief Sync wrapper for ctdb_tunnel_setup computation
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] client Client connection context
* @param[in] tunnel_id Unique tunnel id
* @param[in] callback Callback function to call when a message is received
* @param[in] private_data Private data for callback
* @param[out] result A new tunnel context
* @return 0 on success, errno on failure
*/
int ctdb_tunnel_setup(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct ctdb_client_context *client, uint64_t tunnel_id,
ctdb_tunnel_callback_func_t callback, void *private_data,
struct ctdb_tunnel_context **result);
/**
* @brief Async computation start to destroy a tunnel endpoint
*
* This computation destroys the tunnel endpoint.
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] tctx Tunnel context
* @return a new tevent req on success, NULL on failure
*/
struct tevent_req *ctdb_tunnel_destroy_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_tunnel_context *tctx);
/**
* @brief Async computation end to destroy a tunnel endpoint
*
* @param[in] req Tevent request
* @param[out] perr errno in case of failure
* @return true on success, false on failure
*/
bool ctdb_tunnel_destroy_recv(struct tevent_req *req, int *perr);
/**
* @brief Sync wrapper for ctdb_tunnel_destroy computation
*
* @param[in] ev Tevent context
* @param[in] tctx Tunnel context
* @return 0 on success, errno on failure
*/
int ctdb_tunnel_destroy(struct tevent_context *ev,
struct ctdb_tunnel_context *tctx);
/**
* @brief Async computation start to send a request via a tunnel
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] tctx Tunnel context
* @param[in] destnode PNN of destination
* @param[in] timeout How long to wait
* @param[in] buf Message to send
* @param[in] buflen Size of the message to send
* @param[in] wait_for_reply Whether to wait for reply
* @return a new tevent req on success, NULL on failure
*/
struct tevent_req *ctdb_tunnel_request_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_tunnel_context *tctx,
int destnode,
struct timeval timeout,
uint8_t *buf, size_t buflen,
bool wait_for_reply);
/**
* @brief Async computation end to send a request via a tunnel
*
* @param[in] req Tevent request
* @param[out] perr errno in case of failure
* @param[in] mem_ctx Talloc context
* @param[out] buf Reply data if expected
* @param[out] buflen Size of reply data if expected
* @return true on success, false on failure
*/
bool ctdb_tunnel_request_recv(struct tevent_req *req, int *perr,
TALLOC_CTX *mem_ctx, uint8_t **buf,
size_t *buflen);
/**
* @brief Sync wrapper for ctdb_tunnel_request computation
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] tctx Tunnel context
* @param[in] destnode PNN of destination
* @param[in] timeout How long to wait
* @param[in] buf Message to send
* @param[in] buflen Size of the message to send
* @param[in] wait_for_reply Whether to wait for reply
* @return 0 on success, errno on failure
*/
int ctdb_tunnel_request(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct ctdb_tunnel_context *tctx, int destnode,
struct timeval timeout, uint8_t *buf, size_t buflen,
bool wait_for_reply);
/**
* @brief Async computation start to send a reply via a tunnel
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] tctx Tunnel context
* @param[in] destnode PNN of destination
* @param[in] reqid Request id
* @param[in] timeout How long to wait
* @param[in] buf Reply data
* @param[in] buflen Size of reply data
* @return a new tevent req on success, NULL on failure
*/
struct tevent_req *ctdb_tunnel_reply_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_tunnel_context *tctx,
int destnode, uint32_t reqid,
struct timeval timeout,
uint8_t *buf, size_t buflen);
/**
* @brief Async computation end to send a reply via a tunnel
*
* @param[in] req Tevent request
* @param[out] perr errno in case of failure
* @return true on success, false on failure
*/
bool ctdb_tunnel_reply_recv(struct tevent_req *req, int *perr);
/**
* @brief Sync wrapper for ctdb_tunnel_reply computation
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] tctx Tunnel context
* @param[in] destnode PNN of destination
* @param[in] reqid Request id
* @param[in] timeout How long to wait
* @param[in] buf Reply data
* @param[in] buflen Size of reply data
* @return 0 on success, errno on failure
*/
int ctdb_tunnel_reply(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct ctdb_tunnel_context *tctx, int destnode,
uint32_t reqid, struct timeval timeout,
uint8_t *buf, size_t buflen);
/**
* @brief Async computation start to attach a database
*

11
ctdb/client/client_connect.c
View File

@ -72,6 +72,13 @@ int ctdb_client_init(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
return ret;
}
ret = srvid_init(client, &client->tunnels);
if (ret != 0) {
DEBUG(DEBUG_ERR, ("srvid_init() failed, ret=%d\n", ret));
talloc_free(client);
return ret;
}
client->fd = -1;
client->pnn = CTDB_UNKNOWN_PNN;
@ -199,6 +206,10 @@ static void client_read_handler(uint8_t *buf, size_t buflen,
ctdb_client_reply_control(client, buf, buflen, hdr.reqid);
break;
case CTDB_REQ_TUNNEL:
ctdb_client_req_tunnel(client, buf, buflen, hdr.reqid);
break;
default:
break;
}

13
ctdb/client/client_private.h
View File

@ -35,6 +35,7 @@ struct ctdb_db_context {
struct ctdb_client_context {
struct reqid_context *idr;
struct srvid_context *srv;
struct srvid_context *tunnels;
struct comm_context *comm;
ctdb_client_callback_func_t callback;
void *private_data;
@ -64,6 +65,13 @@ struct ctdb_transaction_handle {
bool updated;
};
struct ctdb_tunnel_context {
struct ctdb_client_context *client;
uint64_t tunnel_id;
ctdb_tunnel_callback_func_t callback;
void *private_data;
};
/* From client_call.c */
void ctdb_client_reply_call(struct ctdb_client_context *client,
@ -79,4 +87,9 @@ void ctdb_client_req_message(struct ctdb_client_context *client,
void ctdb_client_reply_control(struct ctdb_client_context *client,
uint8_t *buf, size_t buflen, uint32_t reqid);
/* From client_tunnel.c */
void ctdb_client_req_tunnel(struct ctdb_client_context *client,
uint8_t *buf, size_t buflen, uint32_t reqid);
#endif /* __CTDB_CLIENT_PRIVATE_H__ */

689
ctdb/client/client_tunnel.c Normal file
View File

@ -0,0 +1,689 @@
/*
CTDB client code
Copyright (C) Amitay Isaacs 2016
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 <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"
struct ctdb_tunnel_data {
struct ctdb_req_header hdr;
struct ctdb_req_tunnel *tunnel;
uint32_t reqid;
};
/*
* Tunnel setup and destroy
*/
struct ctdb_tunnel_setup_state {
struct ctdb_client_context *client;
struct ctdb_tunnel_context *tctx;
uint64_t tunnel_id;
};
static void ctdb_tunnel_setup_register_done(struct tevent_req *subreq);
static void ctdb_tunnel_handler(uint64_t tunnel_id, TDB_DATA data,
void *private_data);
struct tevent_req *ctdb_tunnel_setup_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_client_context *client,
uint64_t tunnel_id,
ctdb_tunnel_callback_func_t callback,
void *private_data)
{
struct tevent_req *req, *subreq;
struct ctdb_tunnel_setup_state *state;
struct ctdb_tunnel_context *tctx;
struct ctdb_req_control request;
int ret;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_tunnel_setup_state);
if (req == NULL) {
return NULL;
}
tctx = talloc_zero(client, struct ctdb_tunnel_context);
if (tevent_req_nomem(tctx, req)) {
return tevent_req_post(req, ev);
}
tctx->client = client;
tctx->tunnel_id = tunnel_id;
tctx->callback = callback;
tctx->private_data = private_data;
state->client = client;
state->tunnel_id = tunnel_id;
state->tctx = tctx;
ret = srvid_exists(client->tunnels, tunnel_id, NULL);
if (ret == 0) {
tevent_req_error(req, EEXIST);
return tevent_req_post(req, ev);
}
ctdb_req_control_tunnel_register(&request, tunnel_id);
subreq = ctdb_client_control_send(state, ev, client,
ctdb_client_pnn(client),
tevent_timeval_zero(),
&request);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, ctdb_tunnel_setup_register_done, req);
return req;
}
static void ctdb_tunnel_setup_register_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct ctdb_tunnel_setup_state *state = tevent_req_data(
req, struct ctdb_tunnel_setup_state);
struct ctdb_reply_control *reply;
bool status;
int ret;
status = ctdb_client_control_recv(subreq, &ret, state, &reply);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
ret = ctdb_reply_control_tunnel_register(reply);
talloc_free(reply);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
ret = srvid_register(state->client->tunnels, state->client,
state->tunnel_id,
ctdb_tunnel_handler, state->tctx);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
static void ctdb_tunnel_handler(uint64_t tunnel_id, TDB_DATA data,
void *private_data)
{
struct ctdb_tunnel_context *tctx = talloc_get_type_abort(
private_data, struct ctdb_tunnel_context);
struct ctdb_tunnel_data *tunnel_data;
if (tctx->tunnel_id != tunnel_id) {
return;
}
if (data.dsize != sizeof(tunnel_data)) {
return;
}
tunnel_data = (struct ctdb_tunnel_data *)data.dptr;
tctx->callback(tctx, tunnel_data->hdr.srcnode, tunnel_data->reqid,
tunnel_data->tunnel->data.dptr,
tunnel_data->tunnel->data.dsize, tctx->private_data);
}
bool ctdb_tunnel_setup_recv(struct tevent_req *req, int *perr,
struct ctdb_tunnel_context **result)
{
struct ctdb_tunnel_setup_state *state = tevent_req_data(
req, struct ctdb_tunnel_setup_state);
int ret;
if (tevent_req_is_unix_error(req, &ret)) {
if (perr != NULL) {
*perr = ret;
}
return false;
}
*result = state->tctx;
return true;
}
int ctdb_tunnel_setup(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct ctdb_client_context *client, uint64_t tunnel_id,
ctdb_tunnel_callback_func_t callback, void *private_data,
struct ctdb_tunnel_context **result)
{
struct tevent_req *req;
int ret;
bool status;
req = ctdb_tunnel_setup_send(mem_ctx, ev, client, tunnel_id,
callback, private_data);
if (req == NULL) {
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_tunnel_setup_recv(req, &ret, result);
talloc_free(req);
if (! status) {
return ret;
}
return 0;
}
struct ctdb_tunnel_destroy_state {
struct ctdb_tunnel_context *tctx;
};
static void ctdb_tunnel_destroy_deregister_done(struct tevent_req *subreq);
struct tevent_req *ctdb_tunnel_destroy_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_tunnel_context *tctx)
{
struct tevent_req *req, *subreq;
struct ctdb_tunnel_destroy_state *state;
struct ctdb_req_control request;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_tunnel_destroy_state);
if (req == NULL) {
return NULL;
}
state->tctx = tctx;
ctdb_req_control_tunnel_deregister(&request, tctx->tunnel_id);
subreq = ctdb_client_control_send(state, ev, tctx->client,
ctdb_client_pnn(tctx->client),
tevent_timeval_zero(),
&request);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, ctdb_tunnel_destroy_deregister_done,
req);
return req;
}
static void ctdb_tunnel_destroy_deregister_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct ctdb_tunnel_destroy_state *state = tevent_req_data(
req, struct ctdb_tunnel_destroy_state);
struct ctdb_client_context *client = state->tctx->client;
struct ctdb_reply_control *reply;
bool status;
int ret;
status = ctdb_client_control_recv(subreq, &ret, state, &reply);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
ret = ctdb_reply_control_tunnel_deregister(reply);
talloc_free(reply);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
ret = srvid_deregister(client->tunnels, state->tctx->tunnel_id,
state->tctx);
if (ret != 0) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
bool ctdb_tunnel_destroy_recv(struct tevent_req *req, int *perr)
{
int ret;
if (tevent_req_is_unix_error(req, &ret)) {
if (perr != NULL) {
*perr = ret;
}
return false;
}
return true;
}
int ctdb_tunnel_destroy(struct tevent_context *ev,
struct ctdb_tunnel_context *tctx)
{
struct tevent_req *req;
int ret;
bool status;
req = ctdb_tunnel_destroy_send(ev, ev, tctx);
if (req == NULL) {
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_tunnel_destroy_recv(req, &ret);
talloc_free(req);
if (! status) {
return ret;
}
return 0;
}
/*
* Callback when REQ_TUNNEL packet is received
*/
static void ctdb_tunnel_request_reply(struct tevent_req *req,
struct ctdb_tunnel_data *tunnel_data);
void ctdb_client_req_tunnel(struct ctdb_client_context *client,
uint8_t *buf, size_t buflen, uint32_t reqid)
{
TALLOC_CTX *tmp_ctx = talloc_new(client);
struct ctdb_req_header h;
struct ctdb_req_tunnel *tunnel;
struct tevent_req *req;
struct ctdb_tunnel_data tunnel_data;
int ret;
tunnel = talloc_zero(tmp_ctx, struct ctdb_req_tunnel);
if (tunnel == NULL) {
goto fail;
}
ret = ctdb_req_tunnel_pull(buf, buflen, &h, tmp_ctx, tunnel);
if (ret != 0) {
goto fail;
}
tunnel_data = (struct ctdb_tunnel_data) {
.hdr = h,
.tunnel = tunnel,
.reqid = reqid,
};
if (tunnel->flags & CTDB_TUNNEL_FLAG_REPLY) {
req = reqid_find(client->idr, reqid, struct tevent_req);
if (req == NULL) {
goto fail;
}
ctdb_tunnel_request_reply(req, &tunnel_data);
} else if (tunnel->flags & CTDB_TUNNEL_FLAG_REQUEST) {
TDB_DATA data = {
.dsize = sizeof(&tunnel_data),
.dptr = (uint8_t *)&tunnel_data,
};
srvid_dispatch(client->tunnels, tunnel->tunnel_id, 0, data);
}
fail:
TALLOC_FREE(tmp_ctx);
}
/*
* Send messages using tunnel
*/
struct ctdb_tunnel_request_state {
struct ctdb_tunnel_context *tctx;
bool wait_for_reply;
uint32_t reqid;
struct ctdb_req_tunnel *tunnel;
};
static int ctdb_tunnel_request_state_destructor(
struct ctdb_tunnel_request_state *state);
static void ctdb_tunnel_request_done(struct tevent_req *subreq);
struct tevent_req *ctdb_tunnel_request_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_tunnel_context *tctx,
int destnode,
struct timeval timeout,
uint8_t *buf, size_t buflen,
bool wait_for_reply)
{
struct tevent_req *req, *subreq;
struct ctdb_tunnel_request_state *state;
struct ctdb_req_tunnel tunnel;
struct ctdb_req_header h;
uint8_t *pkt;
size_t datalen, pkt_len;
int ret;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_tunnel_request_state);
if (req == NULL) {
return NULL;
}
state->tctx = tctx;
state->wait_for_reply = wait_for_reply;
state->reqid = reqid_new(tctx->client->idr, req);
if (state->reqid == REQID_INVALID) {
talloc_free(req);
return NULL;
}
talloc_set_destructor(state, ctdb_tunnel_request_state_destructor);
tunnel = (struct ctdb_req_tunnel) {
.tunnel_id = state->tctx->tunnel_id,
.flags = CTDB_TUNNEL_FLAG_REQUEST,
.data = (TDB_DATA) {
.dptr = buf,
.dsize = buflen,
},
};
if (destnode == CTDB_BROADCAST_ALL ||
destnode == CTDB_BROADCAST_VNNMAP ||
destnode == CTDB_BROADCAST_ALL) {
state->wait_for_reply = false;
}
if (! state->wait_for_reply) {
tunnel.flags |= CTDB_TUNNEL_FLAG_NOREPLY;
}
ctdb_req_header_fill(&h, 0, CTDB_REQ_TUNNEL, destnode,
ctdb_client_pnn(state->tctx->client),
state->reqid);
datalen = ctdb_req_tunnel_len(&h, &tunnel);
ret = ctdb_allocate_pkt(state, datalen, &pkt, &pkt_len);
if (ret != 0) {
tevent_req_error(req, ret);
return tevent_req_post(req, ev);
}
ret = ctdb_req_tunnel_push(&h, &tunnel, pkt, &pkt_len);
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, tctx->client->comm,
pkt, pkt_len);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, ctdb_tunnel_request_done, req);
return req;
}
static int ctdb_tunnel_request_state_destructor(
struct ctdb_tunnel_request_state *state)
{
reqid_remove(state->tctx->client->idr, state->reqid);
return 0;
}
static void ctdb_tunnel_request_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct ctdb_tunnel_request_state *state = tevent_req_data(
req, struct ctdb_tunnel_request_state);
int ret;
bool status;
status = comm_write_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
if (! state->wait_for_reply) {
tevent_req_done(req);
}
/* Wait for the reply or timeout */
}
static void ctdb_tunnel_request_reply(struct tevent_req *req,
struct ctdb_tunnel_data *tunnel_data)
{
struct ctdb_tunnel_request_state *state = tevent_req_data(
req, struct ctdb_tunnel_request_state);
if (tunnel_data->reqid != state->reqid) {
return;
}
state->tunnel = talloc_steal(state, tunnel_data->tunnel);
tevent_req_done(req);
}
bool ctdb_tunnel_request_recv(struct tevent_req *req, int *perr,
TALLOC_CTX *mem_ctx, uint8_t **buf,
size_t *buflen)
{
struct ctdb_tunnel_request_state *state = tevent_req_data(
req, struct ctdb_tunnel_request_state);
int ret;
if (tevent_req_is_unix_error(req, &ret)) {
if (perr != NULL) {
*perr = ret;
}
return false;
}
if (state->wait_for_reply) {
if (buf != NULL) {
*buf = talloc_steal(mem_ctx, state->tunnel->data.dptr);
}
if (buflen != NULL) {
*buflen = state->tunnel->data.dsize;
}
}
return true;
}
int ctdb_tunnel_request(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct ctdb_tunnel_context *tctx, int destnode,
struct timeval timeout, uint8_t *buf, size_t buflen,
bool wait_for_reply)
{
struct tevent_req *req;
int ret;
bool status;
req = ctdb_tunnel_request_send(mem_ctx, ev, tctx, destnode,
timeout, buf, buflen, wait_for_reply);
if (req == NULL) {
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_tunnel_request_recv(req, &ret, NULL, NULL, NULL);
talloc_free(req);
if (! status) {
return ret;
}
return 0;
}
struct ctdb_tunnel_reply_state {
};
static void ctdb_tunnel_reply_done(struct tevent_req *subreq);
struct tevent_req *ctdb_tunnel_reply_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct ctdb_tunnel_context *tctx,
int destnode, uint32_t reqid,
struct timeval timeout,
uint8_t *buf, size_t buflen)
{
struct tevent_req *req, *subreq;
struct ctdb_tunnel_reply_state *state;
struct ctdb_req_tunnel tunnel;
struct ctdb_req_header h;
uint8_t *pkt;
size_t datalen, pkt_len;
int ret;
req = tevent_req_create(mem_ctx, &state,
struct ctdb_tunnel_reply_state);
if (req == NULL) {
return NULL;
}
tunnel = (struct ctdb_req_tunnel) {
.tunnel_id = tctx->tunnel_id,
.flags = CTDB_TUNNEL_FLAG_REPLY,
.data = (TDB_DATA) {
.dptr = buf,
.dsize = buflen,
},
};
ctdb_req_header_fill(&h, 0, CTDB_REQ_TUNNEL, destnode,
ctdb_client_pnn(tctx->client), reqid);
datalen = ctdb_req_tunnel_len(&h, &tunnel);
ret = ctdb_allocate_pkt(state, datalen, &pkt, &pkt_len);
if (ret != 0) {
tevent_req_error(req, ret);
return tevent_req_post(req, ev);
}
ret = ctdb_req_tunnel_push(&h, &tunnel, pkt, &pkt_len);
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, tctx->client->comm, pkt, pkt_len);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, ctdb_tunnel_reply_done, req);
return req;
}
static void ctdb_tunnel_reply_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
int ret;
bool status;
status = comm_write_recv(subreq, &ret);
TALLOC_FREE(subreq);
if (! status) {
tevent_req_error(req, ret);
return;
}
tevent_req_done(req);
}
bool ctdb_tunnel_reply_recv(struct tevent_req *req, int *perr)
{
int ret;
if (tevent_req_is_unix_error(req, &ret)) {
if (perr != NULL) {
*perr = ret;
}
return false;
}
return true;
}
int ctdb_tunnel_reply(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
struct ctdb_tunnel_context *tctx, int destnode,
uint32_t reqid, struct timeval timeout,
uint8_t *buf, size_t buflen)
{
struct tevent_req *req;
int ret;
bool status;
req = ctdb_tunnel_reply_send(mem_ctx, ev, tctx, destnode, reqid,
timeout, buf, buflen);
if (req == NULL) {
return ENOMEM;
}
tevent_req_poll(req, ev);
status = ctdb_tunnel_reply_recv(req, &ret);
talloc_free(req);
if (! status) {
return ret;
}
return 0;
}

2
ctdb/wscript
View File

@ -424,7 +424,7 @@ def build(bld):
client_message_sync.c
client_control_sync.c
client_db.c client_util.c
client_event.c
client_event.c client_tunnel.c
'''),
includes='include',
deps='replace talloc tevent tdb tdb-wrap')