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mcs.c
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mcs.c
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#include <netdb.h>
#include <netinet/tcp.h>
#include <fcntl.h>
#include <assert.h>
#include "mcs.h"
#ifdef MOXI_USE_VBUCKET
mcs_st *mcs_create(mcs_st *ptr, const char *config) {
assert(ptr);
memset(ptr, 0, sizeof(*ptr));
ptr->vch = vbucket_config_parse_string(config);
if (ptr->vch != NULL) {
int n = vbucket_config_get_num_servers(ptr->vch);
if (n > 0) {
ptr->servers = calloc(sizeof(mcs_server_st), n);
if (ptr->servers != NULL) {
for (int i = 0; i < n; i++) {
ptr->servers[i].fd = -1;
}
int j = 0;
for (; j < n; j++) {
const char *hostport = vbucket_config_get_server(ptr->vch, j);
if (hostport != NULL &&
strlen(hostport) > 0 &&
strlen(hostport) < sizeof(ptr->servers[j].hostname) - 1) {
strncpy(ptr->servers[j].hostname,
hostport,
sizeof(ptr->servers[j].hostname) - 1);
char *colon = strchr(ptr->servers[j].hostname, ':');
if (colon != NULL) {
*colon = '\0';
ptr->servers[j].port = atoi(colon + 1);
if (ptr->servers[j].port <= 0) {
fprintf(stderr, "mcs_create failed, could not parse port: %s\n",
config);
break;
}
} else {
fprintf(stderr, "mcs_create failed, missing port: %s\n",
config);
break;
}
} else {
fprintf(stderr, "mcs_create failed, unknown server: %s\n",
config);
break;
}
}
if (j >= n) {
return ptr;
}
}
}
} else {
fprintf(stderr, "mcs_create failed, vbucket_config_parse_string: %s\n",
config);
}
mcs_free(ptr);
return NULL;
}
void mcs_free(mcs_st *ptr) {
if (ptr->servers) {
free(ptr->servers);
}
if (ptr->vch) {
vbucket_config_destroy(ptr->vch);
}
memset(ptr, 0, sizeof(*ptr));
}
uint32_t mcs_server_count(mcs_st *ptr) {
return (uint32_t) vbucket_config_get_num_servers(ptr->vch);
}
mcs_server_st *mcs_server_index(mcs_st *ptr, int i) {
return &ptr->servers[i];
}
/* Returns true if curr_version could be updated with next_version in
* a low-impact stable manner (server-list is the same), allowing the
* same connections to be reused. Or returns false if the delta was
* too large for an in-place updating of curr_version with information
* from next_version.
*
* The next_version may be destroyed in this call, and the caller
* should afterwards only call mcs_free() on the next_version.
*/
bool mcs_stable_update(mcs_st *curr_version, mcs_st *next_version) {
bool rv = false;
VBUCKET_CONFIG_DIFF *diff = vbucket_compare(curr_version->vch, next_version->vch);
if (diff != NULL) {
if (!diff->sequence_changed) {
vbucket_config_destroy(curr_version->vch);
curr_version->vch = next_version->vch;
next_version->vch = 0;
rv = true;
}
vbucket_free_diff(diff);
}
return rv;
}
uint32_t mcs_key_hash(mcs_st *ptr, const char *key, size_t key_length, int *vbucket) {
int v = vbucket_get_vbucket_by_key(ptr->vch, key, key_length);
if (vbucket != NULL) {
*vbucket = v;
}
return (uint32_t) vbucket_get_master(ptr->vch, v);
}
void mcs_server_invalid_vbucket(mcs_st *ptr, int server_index, int vbucket) {
vbucket_found_incorrect_master(ptr->vch, vbucket, server_index);
}
void mcs_server_st_quit(mcs_server_st *ptr, uint8_t io_death) {
// TODO: Should send QUIT cmd.
//
if (ptr->fd != -1) {
close(ptr->fd);
}
ptr->fd = -1;
}
mcs_return mcs_server_st_connect(mcs_server_st *ptr) {
if (ptr->fd != -1)
return MEMCACHED_SUCCESS;
int ret = MEMCACHED_FAILURE;
struct addrinfo *ai = NULL;
struct addrinfo *next = NULL;
struct addrinfo hints = { .ai_flags = AI_PASSIVE,
.ai_socktype = SOCK_STREAM,
.ai_family = AF_UNSPEC };
char port[50];
snprintf(port, sizeof(port), "%d", ptr->port);
int error = getaddrinfo(ptr->hostname, port, &hints, &ai);
if (error != 0) {
if (error != EAI_SYSTEM) {
// settings.extensions.logger->log(EXTENSION_LOG_WARNING, NULL,
// "getaddrinfo(): %s\n", gai_strerror(error));
} else {
// settings.extensions.logger->log(EXTENSION_LOG_WARNING, NULL,
// "getaddrinfo(): %s\n", strerror(error));
}
return MEMCACHED_FAILURE;
}
for (next = ai; next; next = next->ai_next) {
int sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock == -1) {
// settings.extensions.logger->log(EXTENSION_LOG_WARNING, NULL,
// "Failed to create socket: %s\n",
// strerror(errno));
continue;
}
if (connect(sock, ai->ai_addr, ai->ai_addrlen) == -1) {
// settings.extensions.logger->log(EXTENSION_LOG_WARNING, NULL,
// "Failed to connect socket: %s\n",
// strerror(errno));
close(sock);
sock = -1;
continue;
}
int flags = fcntl(sock, F_GETFL, 0);
if (flags < 0 ||
fcntl(sock, F_SETFL, flags | O_NONBLOCK) < 0) {
perror("setting O_NONBLOCK");
close(sock);
sock = -1;
continue;
}
flags = 1;
setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
&flags, (socklen_t) sizeof(flags));
ptr->fd = sock;
ret = MEMCACHED_SUCCESS;
break;
}
freeaddrinfo(ai);
return ret;
}
mcs_return mcs_server_st_do(mcs_server_st *ptr,
const void *command,
size_t command_length,
uint8_t with_flush) {
if (mcs_server_st_connect(ptr) == MEMCACHED_SUCCESS) {
ssize_t n = mcs_server_st_io_write(ptr, command, command_length, with_flush);
if (n == command_length) {
return MEMCACHED_SUCCESS;
}
}
return MEMCACHED_FAILURE;
}
ssize_t mcs_server_st_io_write(mcs_server_st *ptr,
const void *buffer,
size_t length,
char with_flush) {
assert(ptr->fd != -1);
return write(ptr->fd, buffer, length);
}
mcs_return mcs_server_st_read(mcs_server_st *ptr,
void *dta,
size_t size) {
char *data = dta;
size_t done = 0;
while (done < size) {
size_t n = read(ptr->fd, data + done, size - done);
if (n <= 0) {
return MEMCACHED_FAILURE;
}
done += (size_t) n;
}
return MEMCACHED_SUCCESS;
}
void mcs_server_st_io_reset(mcs_server_st *ptr) {
// TODO: memcached_io_reset(ptr);
}
const char *mcs_server_st_hostname(mcs_server_st *ptr) {
return ptr->hostname;
}
int mcs_server_st_port(mcs_server_st *ptr) {
return ptr->port;
}
int mcs_server_st_fd(mcs_server_st *ptr) {
return ptr->fd;
}
#else // !MOXI_USE_VBUCKET
mcs_st *mcs_create(mcs_st *ptr, const char *config) {
ptr = memcached_create(ptr);
if (ptr != NULL) {
memcached_behavior_set(ptr, MEMCACHED_BEHAVIOR_NO_BLOCK, 1);
memcached_behavior_set(ptr, MEMCACHED_BEHAVIOR_KETAMA, 1);
memcached_behavior_set(ptr, MEMCACHED_BEHAVIOR_TCP_NODELAY, 1);
memcached_server_st *mservers;
mservers = memcached_servers_parse(config);
if (mservers != NULL) {
memcached_server_push(ptr, mservers);
memcached_server_list_free(mservers);
return ptr;
}
mcs_free(ptr);
}
return NULL;
}
void mcs_free(mcs_st *ptr) {
memcached_free(ptr);
}
uint32_t mcs_server_count(mcs_st *ptr) {
return memcached_server_count(ptr);
}
mcs_server_st *mcs_server_index(mcs_st *ptr, int i) {
return &ptr->servers[i];
}
bool mcs_stable_update(mcs_st *curr_version, mcs_st *next_version) {
return false;
}
uint32_t mcs_key_hash(mcs_st *ptr, const char *key, size_t key_length, int *vbucket) {
if (vbucket != NULL) {
*vbucket = -1;
}
return memcached_generate_hash(ptr, key, key_length);
}
void mcs_server_invalid_vbucket(mcs_st *ptr, int server_index, int vbucket) {
// NO-OP for libmemcached.
}
void mcs_server_st_quit(mcs_server_st *ptr, uint8_t io_death) {
memcached_quit_server(ptr, io_death);
}
mcs_return mcs_server_st_connect(mcs_server_st *ptr) {
return memcached_connect(ptr);
}
mcs_return mcs_server_st_do(mcs_server_st *ptr,
const void *command,
size_t command_length,
uint8_t with_flush) {
return memcached_do(ptr, command, command_length, with_flush);
}
ssize_t mcs_server_st_io_write(mcs_server_st *ptr,
const void *buffer,
size_t length,
char with_flush) {
return memcached_io_write(ptr, buffer, length, with_flush);
}
mcs_return mcs_server_st_read(mcs_server_st *ptr,
void *dta,
size_t size) {
return memcached_safe_read(ptr, dta, size);
}
void mcs_server_st_io_reset(mcs_server_st *ptr) {
memcached_io_reset(ptr);
}
const char *mcs_server_st_hostname(mcs_server_st *ptr) {
return ptr->hostname;
}
int mcs_server_st_port(mcs_server_st *ptr) {
return ptr->port;
}
int mcs_server_st_fd(mcs_server_st *ptr) {
return ptr->fd;
}
#endif // !MOXI_USE_VBUCKET