LIBCOUCHBASE_API
libcouchbase_error_t libcouchbase_get_replica_by_key(libcouchbase_t instance,
const void *command_cookie,
const void *hashkey,
libcouchbase_size_t nhashkey,
libcouchbase_size_t num_keys,
const void *const *keys,
const libcouchbase_size_t *nkey)
{
libcouchbase_server_t *server;
protocol_binary_request_get req;
int vb, idx;
libcouchbase_size_t ii, *affected_servers = NULL;
/* we need a vbucket config before we can start getting data.. */
if (instance->vbucket_config == NULL) {
return libcouchbase_synchandler_return(instance, LIBCOUCHBASE_ETMPFAIL);
}
affected_servers = calloc(instance->nservers, sizeof(libcouchbase_size_t));
if (affected_servers == NULL) {
return libcouchbase_synchandler_return(instance, LIBCOUCHBASE_CLIENT_ENOMEM);
}
memset(&req, 0, sizeof(req));
req.message.header.request.magic = PROTOCOL_BINARY_REQ;
req.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
req.message.header.request.opcode = CMD_GET_REPLICA;
for (ii = 0; ii < num_keys; ++ii) {
if (nhashkey == 0) {
nhashkey = nkey[ii];
hashkey = keys[ii];
}
vb = vbucket_get_vbucket_by_key(instance->vbucket_config, hashkey, nhashkey);
idx = vbucket_get_replica(instance->vbucket_config, vb, 0);
if (idx < 0 || idx > (int)instance->nservers) {
/* the config says that there is no server yet at that position (-1) */
free(affected_servers);
return libcouchbase_synchandler_return(instance, LIBCOUCHBASE_NETWORK_ERROR);
}
affected_servers[idx]++;
server = instance->servers + idx;
req.message.header.request.keylen = ntohs((libcouchbase_uint16_t)nkey[ii]);
req.message.header.request.vbucket = ntohs((libcouchbase_uint16_t)vb);
req.message.header.request.bodylen = ntohl((libcouchbase_uint32_t)nkey[ii]);
req.message.header.request.opaque = ++instance->seqno;
libcouchbase_server_start_packet(server, command_cookie, req.bytes, sizeof(req.bytes));
libcouchbase_server_write_packet(server, keys[ii], nkey[ii]);
libcouchbase_server_end_packet(server);
}
for (ii = 0; ii < instance->nservers; ++ii) {
if (affected_servers[ii]) {
server = instance->servers + ii;
libcouchbase_server_send_packets(server);
}
}
free(affected_servers);
return libcouchbase_synchandler_return(instance, LIBCOUCHBASE_SUCCESS);
}
static void testConfig(const char *fname) {
int whoops = 0;
const struct key_st *k;
int i = 0;
VBUCKET_CONFIG_HANDLE vb = vbucket_config_parse_file(configPath(fname));
if (vb == NULL) {
fprintf(stderr, "vbucket_config_parse_file error: %s\n",
vbucket_get_error());
abort();
}
while ((k = &keys[i++])->key != NULL) {
int id = vbucket_get_vbucket_by_key(vb, k->key, strlen(k->key));
if (id != k->vbucket) {
fprintf(stderr, "Expected vbucket %d for key '%s' but got %d\n",
k->vbucket, k->key, id);
whoops = 1;
}
}
if (whoops) {
abort();
}
assert(vbucket_config_get_num_servers(vb) == 3 || vbucket_config_get_num_servers(vb) == 4);
assert(vbucket_config_get_num_replicas(vb) == 2);
for (i = 0; i < 3; ++i) {
assert(strcmp(vbucket_config_get_server(vb, i), servers[i]) == 0);
}
for (i = 0; i < 4; ++i) {
assert(vbucket_get_master(vb, i) == vbuckets[i].master);
assert(vbucket_get_replica(vb, i, 0) == vbuckets[i].replicas[0]);
assert(vbucket_get_replica(vb, i, 1) == vbuckets[i].replicas[1]);
}
assert(vbucket_config_get_user(vb) == NULL);
assert(vbucket_config_get_password(vb) == NULL);
vbucket_config_destroy(vb);
}
/**
* Extended version of observe command. This allows us to service
* various forms of higher level operations which use observe in one way
* or another
*/
lcb_error_t lcb_observe_ex(lcb_t instance,
const void *command_cookie,
lcb_size_t num,
const void *const *items,
lcb_observe_type_t type)
{
lcb_size_t ii;
lcb_size_t maxix;
lcb_uint32_t opaque;
struct lcb_command_data_st ct;
struct observe_requests_st reqs;
memset(&reqs, 0, sizeof(reqs));
if (instance->type != LCB_TYPE_BUCKET) {
return lcb_synchandler_return(instance, LCB_EBADHANDLE);
}
if (instance->config.handle == NULL) {
return lcb_synchandler_return(instance, LCB_CLIENT_ETMPFAIL);
}
if (instance->config.dist_type != VBUCKET_DISTRIBUTION_VBUCKET) {
return lcb_synchandler_return(instance, LCB_NOT_SUPPORTED);
}
opaque = ++instance->seqno;
ct.cookie = command_cookie;
maxix = instance->config.nreplicas;
if (type == LCB_OBSERVE_TYPE_CHECK) {
maxix = 0;
} else {
if (type == LCB_OBSERVE_TYPE_DURABILITY) {
ct.flags = LCB_CMD_F_OBS_DURABILITY | LCB_CMD_F_OBS_BCAST;
} else {
ct.flags = LCB_CMD_F_OBS_BCAST;
}
}
reqs.nrequests = instance->nservers;
reqs.requests = calloc(reqs.nrequests, sizeof(*reqs.requests));
for (ii = 0; ii < num; ii++) {
const void *key, *hashkey;
lcb_size_t nkey, nhashkey;
int vbid, jj;
if (type == LCB_OBSERVE_TYPE_DURABILITY) {
const lcb_durability_entry_t *ent = items[ii];
key = ent->request.v.v0.key;
nkey = ent->request.v.v0.nkey;
hashkey = ent->request.v.v0.hashkey;
nhashkey = ent->request.v.v0.nhashkey;
} else {
const lcb_observe_cmd_t *ocmd = items[ii];
key = ocmd->v.v0.key;
nkey = ocmd->v.v0.nkey;
hashkey = ocmd->v.v0.hashkey;
nhashkey = ocmd->v.v0.nhashkey;
}
if (!nhashkey) {
hashkey = key;
nhashkey = nkey;
}
vbid = vbucket_get_vbucket_by_key(instance->config.handle,
hashkey, nhashkey);
for (jj = -1; jj < (int)maxix; jj++) {
struct observe_st *rr;
int idx = vbucket_get_replica(instance->config.handle,
vbid, jj);
if (idx < 0 || idx > (int)instance->nservers) {
if (jj == -1) {
destroy_requests(&reqs);
return lcb_synchandler_return(instance, LCB_NO_MATCHING_SERVER);
}
continue;
}
lcb_assert(idx < (int)reqs.nrequests);
rr = reqs.requests + idx;
if (!rr->allocated) {
if (!init_request(rr)) {
destroy_requests(&reqs);
return lcb_synchandler_return(instance, LCB_CLIENT_ENOMEM);
}
}
{
lcb_uint16_t vb = htons((lcb_uint16_t)vbid);
lcb_uint16_t len = htons((lcb_uint16_t)nkey);
rr->packet.message.header.request.magic = PROTOCOL_BINARY_REQ;
rr->packet.message.header.request.opcode = CMD_OBSERVE;
rr->packet.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
rr->packet.message.header.request.opaque = opaque;
ringbuffer_ensure_capacity(&rr->body,
sizeof(vb) + sizeof(len) + nkey);
rr->nbody += ringbuffer_write(&rr->body, &vb, sizeof(vb));
rr->nbody += ringbuffer_write(&rr->body, &len, sizeof(len));
rr->nbody += ringbuffer_write(&rr->body, key, nkey);
}
}
}
for (ii = 0; ii < reqs.nrequests; ii++) {
struct observe_st *rr = reqs.requests + ii;
struct lcb_server_st *server = instance->servers + ii;
char *tmp;
if (!rr->allocated) {
continue;
}
rr->packet.message.header.request.bodylen = ntohl((lcb_uint32_t)rr->nbody);
ct.start = gethrtime();
lcb_server_start_packet_ct(server, &ct, rr->packet.bytes,
sizeof(rr->packet.bytes));
if (ringbuffer_is_continous(&rr->body, RINGBUFFER_READ, rr->nbody)) {
tmp = ringbuffer_get_read_head(&rr->body);
TRACE_OBSERVE_BEGIN(&rr->packet, server->authority, tmp, rr->nbody);
lcb_server_write_packet(server, tmp, rr->nbody);
} else {
tmp = malloc(ringbuffer_get_nbytes(&rr->body));
if (!tmp) {
/* FIXME by this time some of requests might be scheduled */
destroy_requests(&reqs);
return lcb_synchandler_return(instance, LCB_CLIENT_ENOMEM);
} else {
ringbuffer_read(&rr->body, tmp, rr->nbody);
TRACE_OBSERVE_BEGIN(&rr->packet, server->authority, tmp, rr->nbody);
lcb_server_write_packet(server, tmp, rr->nbody);
}
}
lcb_server_end_packet(server);
lcb_server_send_packets(server);
}
destroy_requests(&reqs);
return lcb_synchandler_return(instance, LCB_SUCCESS);
}
static void get_replica_response_handler(lcb_server_t *server,
packet_info *info)
{
lcb_t root = server->instance;
lcb_uint16_t nkey;
const char *key;
char *packet;
lcb_uint16_t status = PACKET_STATUS(info);
lcb_error_t rc = map_error(root, status);
/**
* Success? always perform the callback
*/
if (status == PROTOCOL_BINARY_RESPONSE_SUCCESS) {
const protocol_binary_response_get *get = PACKET_EPHEMERAL_START(info);
lcb_get_resp_t resp;
setup_lcb_get_resp_t(&resp,
PACKET_KEY(info), PACKET_NKEY(info),
PACKET_VALUE(info), PACKET_NVALUE(info),
ntohl(get->message.body.flags),
PACKET_CAS(info),
PACKET_DATATYPE(info));
root->callbacks.get(root, info->ct.cookie, rc, &resp);
return;
}
key = get_key(server, &nkey, &packet);
/**
* Following code handles errors.
*/
if (info->ct.replica == -1) {
/* Perform the callback. Either SELECT or ALL */
lcb_get_resp_t resp;
setup_lcb_get_resp_t(&resp, key, nkey, NULL, 0, 0, 0, 0);
PACKET_TRACE(TRACE_GET_END, info, rc, &resp);
root->callbacks.get(root, info->ct.cookie, rc, &resp);
release_key(server, packet);
return;
}
/** LCB_REPLICA_FIRST */
if (status == PROTOCOL_BINARY_RESPONSE_NOT_MY_VBUCKET) {
/**
* the config was updated, start from first replica.
* Reset the iteration count
*/
info->ct.replica = 0;
} else {
info->ct.replica++;
}
if (info->ct.replica < root->nreplicas) {
/* try next replica */
protocol_binary_request_get req;
lcb_server_t *new_server;
int idx = vbucket_get_replica(root->vbucket_config,
info->ct.vbucket,
info->ct.replica);
if (idx < 0 || idx > (int)root->nservers) {
lcb_error_handler(root, LCB_NETWORK_ERROR,
"GET_REPLICA: missing server");
release_key(server, packet);
return;
}
new_server = root->servers + idx;
memset(&req, 0, sizeof(req));
req.message.header.request.magic = PROTOCOL_BINARY_REQ;
req.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
req.message.header.request.opcode = CMD_GET_REPLICA;
req.message.header.request.keylen = ntohs((lcb_uint16_t)nkey);
req.message.header.request.vbucket = ntohs(info->ct.vbucket);
req.message.header.request.bodylen = ntohl((lcb_uint32_t)nkey);
req.message.header.request.opaque = ++root->seqno;
TRACE_GET_BEGIN(&req, key, nkey, 0);
lcb_server_retry_packet(new_server, &info->ct,
req.bytes, sizeof(req.bytes));
lcb_server_write_packet(new_server, key, nkey);
lcb_server_end_packet(new_server);
lcb_server_send_packets(new_server);
} else {
/* give up and report the error */
lcb_get_resp_t resp;
setup_lcb_get_resp_t(&resp, key, nkey, NULL, 0, 0, 0, 0);
PACKET_TRACE(TRACE_GET_END, info, rc, &resp)
root->callbacks.get(root, info->ct.cookie, rc, &resp);
}
release_key(server, packet);
}
/**
* Send a preformatted packet to the cluster
* This prototype copies the buffers into the internal structures
* instead of just keeping a reference...
*/
LIBCOUCHBASE_API
lcb_error_t lcb_forward_packet(lcb_t instance,
const void *command_cookie,
lcb_size_t num,
const lcb_packet_fwd_cmd_t *const *commands)
{
lcb_size_t ii;
lcb_error_handler(instance, LCB_SUCCESS, NULL);
/* we need a vbucket config before we can start getting data.. */
if (instance->vbucket_config == NULL) {
switch (instance->type) {
case LCB_TYPE_CLUSTER:
return lcb_synchandler_return(instance, LCB_EBADHANDLE);
case LCB_TYPE_BUCKET:
default:
return lcb_synchandler_return(instance, LCB_CLIENT_ETMPFAIL);
}
}
/* Now handle all of the requests */
for (ii = 0; ii < num; ++ii) {
lcb_server_t *server;
protocol_binary_request_no_extras *req;
int idx;
int vb = 0;
/* @todo ensure that we support the current command */
/* @todo currently the entire header needs to be in the first
* chunk */
assert(commands[ii]->v.v0.buffer.iov[0].iov_len >= 24);
/* I need to update the sequence number in the packet! */
req = (void *)commands[ii]->v.v0.buffer.iov[0].iov_base;
vb = ntohs(req->message.header.request.vbucket);
if (commands[ii]->v.v0.to_master) {
idx = vbucket_get_master(instance->vbucket_config, vb);
} else {
idx = vbucket_get_replica(instance->vbucket_config, vb,
commands[ii]->v.v0.replica_index);
}
if (idx < 0 || idx > (int)instance->nservers) {
return lcb_synchandler_return(instance, LCB_NO_MATCHING_SERVER);
}
server = instance->servers + idx;
++instance->seqno;
/* avoid alignment crash by using memcpy */
memcpy(&req->message.header.request.opaque, &instance->seqno, 4);
lcb_server_start_packet(server, command_cookie,
commands[ii]->v.v0.buffer.iov[0].iov_base,
commands[ii]->v.v0.buffer.iov[0].iov_len);
lcb_server_write_packet(server,
commands[ii]->v.v0.buffer.iov[1].iov_base,
commands[ii]->v.v0.buffer.iov[1].iov_len);
lcb_server_end_packet(server);
lcb_server_send_packets(server);
}
return lcb_synchandler_return(instance, LCB_SUCCESS);
}
LIBCOUCHBASE_API
lcb_error_t lcb_get_replica(lcb_t instance,
const void *command_cookie,
lcb_size_t num,
const lcb_get_replica_cmd_t *const *items)
{
lcb_server_t *server;
protocol_binary_request_get req;
int vb, idx;
lcb_size_t ii, *affected_servers = NULL;
/* we need a vbucket config before we can start getting data.. */
if (instance->vbucket_config == NULL) {
switch (instance->type) {
case LCB_TYPE_CLUSTER:
return lcb_synchandler_return(instance, LCB_EBADHANDLE);
case LCB_TYPE_BUCKET:
default:
return lcb_synchandler_return(instance, LCB_CLIENT_ETMPFAIL);
}
}
affected_servers = calloc(instance->nservers, sizeof(lcb_size_t));
if (affected_servers == NULL) {
return lcb_synchandler_return(instance, LCB_CLIENT_ENOMEM);
}
memset(&req, 0, sizeof(req));
req.message.header.request.magic = PROTOCOL_BINARY_REQ;
req.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
req.message.header.request.opcode = CMD_GET_REPLICA;
for (ii = 0; ii < num; ++ii) {
const void *key;
lcb_size_t nkey;
int r0, r1;
lcb_replica_t strategy;
struct lcb_command_data_st ct;
memset(&ct, 0, sizeof(struct lcb_command_data_st));
ct.start = gethrtime();
ct.cookie = command_cookie;
strategy = LCB_REPLICA_FIRST;
r0 = 0; /* begin */
r1 = 0; /* end */
switch (items[ii]->version) {
case 0:
key = items[ii]->v.v0.key;
nkey = items[ii]->v.v0.nkey;
break;
case 1:
key = items[ii]->v.v1.key;
nkey = items[ii]->v.v1.nkey;
strategy = items[ii]->v.v1.strategy;
switch (strategy) {
case LCB_REPLICA_FIRST:
r0 = r1 = 0;
/* iterate replicas in a sequence until first
* successful response */
ct.replica = 0;
break;
case LCB_REPLICA_SELECT:
r0 = r1 = items[ii]->v.v1.index;
if (r0 >= instance->nreplicas) {
return lcb_synchandler_return(instance, LCB_EINVAL);
}
ct.replica = -1; /* do not iterate */
break;
case LCB_REPLICA_ALL:
r0 = 0;
r1 = instance->nreplicas;
ct.replica = -1; /* do not iterate */
break;
}
break;
default:
return lcb_synchandler_return(instance, LCB_EINVAL);
}
do {
vb = vbucket_get_vbucket_by_key(instance->vbucket_config,
key, nkey);
idx = vbucket_get_replica(instance->vbucket_config, vb, r0);
if (idx < 0 || idx > (int)instance->nservers) {
free(affected_servers);
/* FIXME: when 'packet' patch will be applied, here
* should be rollback of all the previous commands
* queued */
return lcb_synchandler_return(instance, LCB_NO_MATCHING_SERVER);
}
affected_servers[idx]++;
server = instance->servers + idx;
req.message.header.request.keylen = ntohs((lcb_uint16_t)nkey);
req.message.header.request.vbucket = ntohs((lcb_uint16_t)vb);
req.message.header.request.bodylen = ntohl((lcb_uint32_t)nkey);
req.message.header.request.opaque = ++instance->seqno;
lcb_server_start_packet_ex(server, &ct, req.bytes,
sizeof(req.bytes));
lcb_server_write_packet(server, key, nkey);
lcb_server_end_packet(server);
++r0;
} while (r0 < r1);
}
for (ii = 0; ii < instance->nservers; ++ii) {
if (affected_servers[ii]) {
server = instance->servers + ii;
lcb_server_send_packets(server);
}
}
free(affected_servers);
return lcb_synchandler_return(instance, LCB_SUCCESS);
}
LIBCOUCHBASE_API
lcb_error_t lcb_observe(lcb_t instance,
const void *command_cookie,
lcb_size_t num,
const lcb_observe_cmd_t *const *items)
{
int vbid, idx, jj;
lcb_size_t ii;
lcb_uint32_t opaque;
struct observe_st *requests;
/* we need a vbucket config before we can start getting data.. */
if (instance->vbucket_config == NULL) {
switch (instance->type) {
case LCB_TYPE_CLUSTER:
return lcb_synchandler_return(instance, LCB_EBADHANDLE);
case LCB_TYPE_BUCKET:
default:
return lcb_synchandler_return(instance, LCB_CLIENT_ETMPFAIL);
}
}
if (instance->dist_type != VBUCKET_DISTRIBUTION_VBUCKET) {
return lcb_synchandler_return(instance, LCB_NOT_SUPPORTED);
}
/* the list of pointers to body buffers for each server */
requests = calloc(instance->nservers, sizeof(struct observe_st));
opaque = ++instance->seqno;
for (ii = 0; ii < num; ++ii) {
const void *key = items[ii]->v.v0.key;
lcb_size_t nkey = items[ii]->v.v0.nkey;
const void *hashkey = items[ii]->v.v0.hashkey;
lcb_size_t nhashkey = items[ii]->v.v0.nhashkey;
if (nhashkey == 0) {
hashkey = key;
nhashkey = nkey;
}
vbid = vbucket_get_vbucket_by_key(instance->vbucket_config, hashkey,
nhashkey);
for (jj = -1; jj < instance->nreplicas; ++jj) {
struct observe_st *rr;
/* it will increment jj to get server index, so (-1 + 1) = 0 (master) */
idx = vbucket_get_replica(instance->vbucket_config, vbid, jj);
if ((idx < 0 || idx > (int)instance->nservers)) {
/* the config says that there is no server yet at that position (-1) */
if (jj == -1) {
/* master node must be available */
destroy_requests(requests, instance->nservers);
return lcb_synchandler_return(instance, LCB_NETWORK_ERROR);
} else {
continue;
}
}
rr = requests + idx;
if (!rr->allocated) {
if (!init_request(rr)) {
destroy_requests(requests, instance->nservers);
return lcb_synchandler_return(instance, LCB_CLIENT_ENOMEM);
}
rr->req.message.header.request.magic = PROTOCOL_BINARY_REQ;
rr->req.message.header.request.opcode = CMD_OBSERVE;
rr->req.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
rr->req.message.header.request.opaque = opaque;
}
{
lcb_uint16_t vb = htons((lcb_uint16_t)vbid);
lcb_uint16_t len = htons((lcb_uint16_t)nkey);
ringbuffer_ensure_capacity(&rr->body, sizeof(vb) + sizeof(len) + nkey);
rr->nbody += ringbuffer_write(&rr->body, &vb, sizeof(vb));
rr->nbody += ringbuffer_write(&rr->body, &len, sizeof(len));
rr->nbody += ringbuffer_write(&rr->body, key, nkey);
}
}
}
for (ii = 0; ii < instance->nservers; ++ii) {
struct observe_st *rr = requests + ii;
lcb_server_t *server = instance->servers + ii;
if (rr->allocated) {
char *tmp;
rr->req.message.header.request.bodylen = ntohl((lcb_uint32_t)rr->nbody);
lcb_server_start_packet(server, command_cookie, rr->req.bytes, sizeof(rr->req.bytes));
if (ringbuffer_is_continous(&rr->body, RINGBUFFER_READ, rr->nbody)) {
tmp = ringbuffer_get_read_head(&rr->body);
TRACE_OBSERVE_BEGIN(&rr->req, server->authority, tmp, rr->nbody);
lcb_server_write_packet(server, tmp, rr->nbody);
} else {
tmp = malloc(ringbuffer_get_nbytes(&rr->body));
if (!tmp) {
/* FIXME by this time some of requests might be scheduled */
destroy_requests(requests, instance->nservers);
return lcb_synchandler_return(instance, LCB_CLIENT_ENOMEM);
} else {
ringbuffer_read(&rr->body, tmp, rr->nbody);
TRACE_OBSERVE_BEGIN(&rr->req, server->authority, tmp, rr->nbody);
lcb_server_write_packet(server, tmp, rr->nbody);
}
}
lcb_server_end_packet(server);
lcb_server_send_packets(server);
}
}
destroy_requests(requests, instance->nservers);
return lcb_synchandler_return(instance, LCB_SUCCESS);
}
static void get_replica_response_handler(lcb_server_t *server,
struct lcb_command_data_st *command_data,
protocol_binary_response_header *res)
{
lcb_t root = server->instance;
protocol_binary_response_get *get = (void *)res;
lcb_uint16_t status = ntohs(res->response.status);
lcb_uint16_t nkey = ntohs(res->response.keylen);
const char *key = (const char *)res;
char *packet;
lcb_error_t rc = map_error(root, status);
key += sizeof(get->bytes);
if (key == NULL) {
lcb_error_handler(server->instance, LCB_EINTERNAL, NULL);
return;
}
/**
* Success? always perform the callback
*/
if (status == PROTOCOL_BINARY_RESPONSE_SUCCESS) {
const char *bytes = key + nkey;
lcb_size_t nbytes = ntohl(res->response.bodylen) - nkey - res->response.extlen;
lcb_get_resp_t resp;
setup_lcb_get_resp_t(&resp, key, nkey, bytes, nbytes,
ntohl(get->message.body.flags),
res->response.cas,
res->response.datatype);
TRACE_GET_END(res->response.opaque, command_data->vbucket,
res->response.opcode, rc, &resp);
root->callbacks.get(root, command_data->cookie, rc, &resp);
return;
}
key = get_key(server, &nkey, &packet);
/**
* Following code handles errors.
*/
if (command_data->replica == -1) {
/* Perform the callback. Either SELECT or ALL */
lcb_get_resp_t resp;
setup_lcb_get_resp_t(&resp, key, nkey, NULL, 0, 0, 0, 0);
TRACE_GET_END(res->response.opaque, command_data->vbucket,
res->response.opcode, rc, &resp);
root->callbacks.get(root, command_data->cookie, rc, &resp);
release_key(server, packet);
return;
}
/** LCB_REPLICA_FIRST */
if (status == PROTOCOL_BINARY_RESPONSE_NOT_MY_VBUCKET) {
/**
* the config was updated, start from first replica.
* Reset the iteration count
*/
command_data->replica = 0;
} else {
command_data->replica++;
}
if (command_data->replica < root->nreplicas) {
/* try next replica */
protocol_binary_request_get req;
lcb_server_t *new_server;
int idx = vbucket_get_replica(root->vbucket_config,
command_data->vbucket,
command_data->replica);
if (idx < 0 || idx > (int)root->nservers) {
lcb_error_handler(root, LCB_NETWORK_ERROR,
"GET_REPLICA: missing server");
release_key(server, packet);
return;
}
new_server = root->servers + idx;
memset(&req, 0, sizeof(req));
req.message.header.request.magic = PROTOCOL_BINARY_REQ;
req.message.header.request.datatype = PROTOCOL_BINARY_RAW_BYTES;
req.message.header.request.opcode = CMD_GET_REPLICA;
req.message.header.request.keylen = ntohs((lcb_uint16_t)nkey);
req.message.header.request.vbucket = ntohs(command_data->vbucket);
req.message.header.request.bodylen = ntohl((lcb_uint32_t)nkey);
req.message.header.request.opaque = ++root->seqno;
TRACE_GET_BEGIN(&req, key, nkey, 0);
lcb_server_retry_packet(new_server, command_data,
req.bytes, sizeof(req.bytes));
lcb_server_write_packet(new_server, key, nkey);
lcb_server_end_packet(new_server);
lcb_server_send_packets(new_server);
} else {
/* give up and report the error */
lcb_get_resp_t resp;
setup_lcb_get_resp_t(&resp, key, nkey, NULL, 0, 0, 0,
res->response.datatype);
TRACE_GET_END(res->response.opaque, command_data->vbucket,
res->response.opcode, rc, &resp);
root->callbacks.get(root, command_data->cookie, rc, &resp);
}
release_key(server, packet);
}