+++ /dev/null
-/*
- +--------------------------------------------------------------------+
- | libmemcached - C/C++ Client Library for memcached |
- +--------------------------------------------------------------------+
- | Redistribution and use in source and binary forms, with or without |
- | modification, are permitted under the terms of the BSD license. |
- | You should have received a copy of the license in a bundled file |
- | named LICENSE; in case you did not receive a copy you can review |
- | the terms online at: https://opensource.org/licenses/BSD-3-Clause |
- +--------------------------------------------------------------------+
- | Copyright (c) 2006-2014 Brian Aker https://datadifferential.com/ |
- | Copyright (c) 2020 Michael Wallner <mike@php.net> |
- +--------------------------------------------------------------------+
-*/
-
-#include "mem_config.h"
-
-#include <stdio.h>
-#include <inttypes.h>
-#include <limits.h>
-#include <sys/uio.h>
-#include <event.h>
-#include <fcntl.h>
-#include <netinet/tcp.h>
-#include <netinet/in.h>
-
-#if defined(HAVE_ARPA_INET_H)
-# include <arpa/inet.h>
-#endif
-
-#if defined(HAVE_SYS_TIME_H)
-# include <sys/time.h>
-#endif
-
-#if defined(HAVE_TIME_H)
-# include <time.h>
-#endif
-
-#include "ms_setting.h"
-#include "ms_thread.h"
-#include "ms_atomic.h"
-
-#ifdef linux
-/* /usr/include/netinet/in.h defines macros from ntohs() to _bswap_nn to
- * optimize the conversion functions, but the prototypes generate warnings
- * from gcc. The conversion methods isn't the bottleneck for my app, so
- * just remove the warnings by undef'ing the optimization ..
- */
-# undef ntohs
-# undef ntohl
-# undef htons
-# undef htonl
-#endif
-
-/* for network write */
-#define TRANSMIT_COMPLETE 0
-#define TRANSMIT_INCOMPLETE 1
-#define TRANSMIT_SOFT_ERROR 2
-#define TRANSMIT_HARD_ERROR 3
-
-/* for generating key */
-#define KEY_PREFIX_BASE 0x1010101010101010 /* not include ' ' '\r' '\n' '\0' */
-#define KEY_PREFIX_MASK 0x1010101010101010
-
-/* For parse the value length return by server */
-#define KEY_TOKEN 1
-#define VALUELEN_TOKEN 3
-
-/* global increasing counter, to ensure the key prefix unique */
-static uint64_t key_prefix_seq = KEY_PREFIX_BASE;
-
-/* global increasing counter, generating request id for UDP */
-static ATOMIC uint32_t udp_request_id = 0;
-
-extern pthread_key_t ms_thread_key;
-
-/* generate upd request id */
-static uint32_t ms_get_udp_request_id(void);
-
-/* connect initialize */
-static void ms_task_init(ms_conn_t *c);
-static int ms_conn_udp_init(ms_conn_t *c, const bool is_udp);
-static int ms_conn_sock_init(ms_conn_t *c);
-static int ms_conn_event_init(ms_conn_t *c);
-static int ms_conn_init(ms_conn_t *c, const int init_state, const int read_buffer_size,
- const bool is_udp);
-static void ms_warmup_num_init(ms_conn_t *c);
-static int ms_item_win_init(ms_conn_t *c);
-
-/* connection close */
-void ms_conn_free(ms_conn_t *c);
-static void ms_conn_close(ms_conn_t *c);
-
-/* create network connection */
-static int ms_new_socket(struct addrinfo *ai);
-static void ms_maximize_sndbuf(const int sfd);
-static int ms_network_connect(ms_conn_t *c, char *srv_host_name, const int srv_port,
- const bool is_udp, int *ret_sfd);
-static int ms_reconn(ms_conn_t *c);
-
-/* read and parse */
-static int ms_tokenize_command(char *command, token_t *tokens, const int max_tokens);
-static int ms_ascii_process_line(ms_conn_t *c, char *command);
-static int ms_try_read_line(ms_conn_t *c);
-static int ms_sort_udp_packet(ms_conn_t *c, char *buf, int rbytes);
-static int ms_udp_read(ms_conn_t *c, char *buf, int len);
-static int ms_try_read_network(ms_conn_t *c);
-static void ms_verify_value(ms_conn_t *c, ms_mlget_task_item_t *mlget_item, char *value, int vlen);
-static void ms_ascii_complete_nread(ms_conn_t *c);
-static void ms_bin_complete_nread(ms_conn_t *c);
-static void ms_complete_nread(ms_conn_t *c);
-
-/* send functions */
-static int ms_add_msghdr(ms_conn_t *c);
-static int ms_ensure_iov_space(ms_conn_t *c);
-static int ms_add_iov(ms_conn_t *c, const void *buf, int len);
-static int ms_build_udp_headers(ms_conn_t *c);
-static int ms_transmit(ms_conn_t *c);
-
-/* status adjustment */
-static void ms_conn_shrink(ms_conn_t *c);
-static void ms_conn_set_state(ms_conn_t *c, int state);
-static bool ms_update_event(ms_conn_t *c, const int new_flags);
-static uint32_t ms_get_rep_sock_index(ms_conn_t *c, int cmd);
-static uint32_t ms_get_next_sock_index(ms_conn_t *c);
-static int ms_update_conn_sock_event(ms_conn_t *c);
-static bool ms_need_yield(ms_conn_t *c);
-static void ms_update_start_time(ms_conn_t *c);
-
-/* main loop */
-static void ms_drive_machine(ms_conn_t *c);
-void ms_event_handler(const int fd, const short which, void *arg);
-
-/* ascii protocol */
-static int ms_build_ascii_write_buf_set(ms_conn_t *c, ms_task_item_t *item);
-static int ms_build_ascii_write_buf_get(ms_conn_t *c, ms_task_item_t *item);
-static int ms_build_ascii_write_buf_mlget(ms_conn_t *c);
-
-/* binary protocol */
-static int ms_bin_process_response(ms_conn_t *c);
-static void ms_add_bin_header(ms_conn_t *c, uint8_t opcode, uint8_t hdr_len, uint16_t key_len,
- uint32_t body_len);
-static void ms_add_key_to_iov(ms_conn_t *c, ms_task_item_t *item);
-static int ms_build_bin_write_buf_set(ms_conn_t *c, ms_task_item_t *item);
-static int ms_build_bin_write_buf_get(ms_conn_t *c, ms_task_item_t *item);
-static int ms_build_bin_write_buf_mlget(ms_conn_t *c);
-
-/**
- * each key has two parts, prefix and suffix. The suffix is a
- * string random get form the character table. The prefix is a
- * uint64_t variable. And the prefix must be unique. we use the
- * prefix to identify a key. And the prefix can't include
- * character ' ' '\r' '\n' '\0'.
- *
- * @return uint64_t
- */
-uint64_t ms_get_key_prefix(void) {
- uint64_t key_prefix;
-
- pthread_mutex_lock(&ms_global.seq_mutex);
- key_prefix_seq |= KEY_PREFIX_MASK;
- key_prefix = key_prefix_seq;
- key_prefix_seq++;
- pthread_mutex_unlock(&ms_global.seq_mutex);
-
- return key_prefix;
-} /* ms_get_key_prefix */
-
-/**
- * get an unique udp request id
- *
- * @return an unique UDP request id
- */
-static uint32_t ms_get_udp_request_id(void) {
- return atomic_add_32_nv(&udp_request_id, 1);
-}
-
-/**
- * initialize current task structure
- *
- * @param c, pointer of the concurrency
- */
-static void ms_task_init(ms_conn_t *c) {
- c->curr_task.cmd = CMD_NULL;
- c->curr_task.item = 0;
- c->curr_task.verify = false;
- c->curr_task.finish_verify = true;
- c->curr_task.get_miss = true;
-
- c->curr_task.get_opt = 0;
- c->curr_task.set_opt = 0;
- c->curr_task.cycle_undo_get = 0;
- c->curr_task.cycle_undo_set = 0;
- c->curr_task.verified_get = 0;
- c->curr_task.overwrite_set = 0;
-} /* ms_task_init */
-
-/**
- * initialize udp for the connection structure
- *
- * @param c, pointer of the concurrency
- * @param is_udp, whether it's udp
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_conn_udp_init(ms_conn_t *c, const bool is_udp) {
- c->hdrbuf = 0;
- c->rudpbuf = 0;
- c->udppkt = 0;
-
- c->rudpsize = UDP_DATA_BUFFER_SIZE;
- c->hdrsize = 0;
-
- c->rudpbytes = 0;
- c->packets = 0;
- c->recvpkt = 0;
- c->pktcurr = 0;
- c->ordcurr = 0;
-
- c->udp = is_udp;
-
- if (c->udp || (!c->udp && ms_setting.facebook_test)) {
- c->rudpbuf = (char *) malloc((size_t) c->rudpsize);
- c->udppkt = (ms_udppkt_t *) malloc(MAX_UDP_PACKET * sizeof(ms_udppkt_t));
-
- if ((c->rudpbuf == NULL) || (c->udppkt == NULL)) {
- if (c->rudpbuf)
- free(c->rudpbuf);
- if (c->udppkt)
- free(c->udppkt);
- fprintf(stderr, "malloc()\n");
- return -1;
- }
- memset(c->udppkt, 0, MAX_UDP_PACKET * sizeof(ms_udppkt_t));
- }
-
- return EXIT_SUCCESS;
-} /* ms_conn_udp_init */
-
-/**
- * initialize the connection structure
- *
- * @param c, pointer of the concurrency
- * @param init_state, (conn_read, conn_write, conn_closing)
- * @param read_buffer_size
- * @param is_udp, whether it's udp
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_conn_init(ms_conn_t *c, const int init_state, const int read_buffer_size,
- const bool is_udp) {
- assert(c);
-
- c->rbuf = c->wbuf = 0;
- c->iov = 0;
- c->msglist = 0;
-
- c->rsize = read_buffer_size;
- c->wsize = WRITE_BUFFER_SIZE;
- c->iovsize = IOV_LIST_INITIAL;
- c->msgsize = MSG_LIST_INITIAL;
-
- /* for replication, each connection need connect all the server */
- if (ms_setting.rep_write_srv > 0) {
- c->total_sfds = ms_setting.srv_cnt * ms_setting.sock_per_conn;
- } else {
- c->total_sfds = ms_setting.sock_per_conn;
- }
- c->alive_sfds = 0;
-
- c->rbuf = (char *) malloc((size_t) c->rsize);
- c->wbuf = (char *) malloc((size_t) c->wsize);
- c->iov = (struct iovec *) malloc(sizeof(struct iovec) * (size_t) c->iovsize);
- c->msglist = (struct msghdr *) malloc(sizeof(struct msghdr) * (size_t) c->msgsize);
- if (ms_setting.mult_key_num > 1) {
- c->mlget_task.mlget_item = (ms_mlget_task_item_t *) malloc(sizeof(ms_mlget_task_item_t)
- * (size_t) ms_setting.mult_key_num);
- }
- c->tcpsfd = (int *) malloc((size_t) c->total_sfds * sizeof(int));
-
- if ((c->rbuf == NULL) || (c->wbuf == NULL) || (c->iov == NULL) || (c->msglist == NULL)
- || (c->tcpsfd == NULL)
- || ((ms_setting.mult_key_num > 1) && (c->mlget_task.mlget_item == NULL)))
- {
- if (c->rbuf)
- free(c->rbuf);
- if (c->wbuf)
- free(c->wbuf);
- if (c->iov)
- free(c->iov);
- if (c->msglist)
- free(c->msglist);
- if (c->mlget_task.mlget_item)
- free(c->mlget_task.mlget_item);
- if (c->tcpsfd)
- free(c->tcpsfd);
- fprintf(stderr, "malloc()\n");
- return -1;
- }
-
- c->state = init_state;
- c->rvbytes = 0;
- c->rbytes = 0;
- c->rcurr = c->rbuf;
- c->wcurr = c->wbuf;
- c->iovused = 0;
- c->msgcurr = 0;
- c->msgused = 0;
- c->cur_idx = c->total_sfds; /* default index is a invalid value */
-
- c->ctnwrite = false;
- c->readval = false;
- c->change_sfd = false;
-
- c->precmd.cmd = c->currcmd.cmd = CMD_NULL;
- c->precmd.isfinish = true; /* default the previous command finished */
- c->currcmd.isfinish = false;
- c->precmd.retstat = c->currcmd.retstat = MCD_FAILURE;
- c->precmd.key_prefix = c->currcmd.key_prefix = 0;
-
- c->mlget_task.mlget_num = 0;
- c->mlget_task.value_index = -1; /* default invalid value */
-
- if (ms_setting.binary_prot_) {
- c->protocol = binary_prot;
- } else {
- c->protocol = ascii_prot;
- }
-
- /* initialize udp */
- if (ms_conn_udp_init(c, is_udp)) {
- return -1;
- }
-
- /* initialize task */
- ms_task_init(c);
-
- if (!(ms_setting.facebook_test && is_udp)) {
- atomic_add_32(&ms_stats.active_conns, 1);
- }
-
- return EXIT_SUCCESS;
-} /* ms_conn_init */
-
-/**
- * when doing 100% get operation, it could preset some objects
- * to warmup the server. this function is used to initialize the
- * number of the objects to preset.
- *
- * @param c, pointer of the concurrency
- */
-static void ms_warmup_num_init(ms_conn_t *c) {
- /* no set operation, preset all the items in the window */
- if (ms_setting.cmd_distr[CMD_SET].cmd_prop < PROP_ERROR) {
- c->warmup_num = c->win_size;
- c->remain_warmup_num = c->warmup_num;
- } else {
- c->warmup_num = 0;
- c->remain_warmup_num = c->warmup_num;
- }
-} /* ms_warmup_num_init */
-
-/**
- * each connection has an item window, this function initialize
- * the window. The window is used to generate task.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_item_win_init(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- int exp_cnt = 0;
-
- c->win_size = (int) ms_setting.win_size;
- c->set_cursor = 0;
- c->exec_num = ms_thread->thread_ctx->exec_num_perconn;
- c->remain_exec_num = c->exec_num;
-
- c->item_win = (ms_task_item_t *) malloc(sizeof(ms_task_item_t) * (size_t) c->win_size);
- if (c->item_win == NULL) {
- fprintf(stderr, "Can't allocate task item array for conn.\n");
- return -1;
- }
- memset(c->item_win, 0, sizeof(ms_task_item_t) * (size_t) c->win_size);
-
- for (int i = 0; i < c->win_size; i++) {
- c->item_win[i].key_size = (int) ms_setting.distr[i].key_size;
- c->item_win[i].key_prefix = ms_get_key_prefix();
- c->item_win[i].key_suffix_offset = ms_setting.distr[i].key_offset;
- c->item_win[i].value_size = (int) ms_setting.distr[i].value_size;
- c->item_win[i].value_offset = INVALID_OFFSET; /* default in invalid offset */
- c->item_win[i].client_time = 0;
-
- /* set expire time base on the proportion */
- if (exp_cnt < ms_setting.exp_ver_per * i) {
- c->item_win[i].exp_time = FIXED_EXPIRE_TIME;
- exp_cnt++;
- } else {
- c->item_win[i].exp_time = 0;
- }
- }
-
- ms_warmup_num_init(c);
-
- return EXIT_SUCCESS;
-} /* ms_item_win_init */
-
-/**
- * each connection structure can include one or more sock
- * handlers. this function create these socks and connect the
- * server(s).
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_conn_sock_init(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- uint32_t i;
- int ret_sfd;
- uint32_t srv_idx = 0;
-
- assert(c);
- assert(c->tcpsfd);
-
- for (i = 0; i < c->total_sfds; i++) {
- ret_sfd = 0;
- if (ms_setting.rep_write_srv > 0) {
- /* for replication, each connection need connect all the server */
- srv_idx = i % ms_setting.srv_cnt;
- } else {
- /* all the connections in a thread connects the same server */
- srv_idx = ms_thread->thread_ctx->srv_idx;
- }
-
- if (ms_network_connect(c, ms_setting.servers[srv_idx].srv_host_name,
- ms_setting.servers[srv_idx].srv_port, ms_setting.udp, &ret_sfd)
-)
- {
- break;
- }
-
- if (i == 0) {
- c->sfd = ret_sfd;
- }
-
- if (!ms_setting.udp) {
- c->tcpsfd[i] = ret_sfd;
- }
-
- c->alive_sfds++;
- }
-
- /* initialize udp sock handler if necessary */
- if (ms_setting.facebook_test) {
- ret_sfd = 0;
- if (ms_network_connect(c, ms_setting.servers[srv_idx].srv_host_name,
- ms_setting.servers[srv_idx].srv_port, true, &ret_sfd)
-)
- {
- c->udpsfd = 0;
- } else {
- c->udpsfd = ret_sfd;
- }
- }
-
- if ((i != c->total_sfds) || (ms_setting.facebook_test && (c->udpsfd == 0))) {
- if (ms_setting.udp) {
- close(c->sfd);
- } else {
- for (uint32_t j = 0; j < i; j++) {
- close(c->tcpsfd[j]);
- }
- }
-
- if (c->udpsfd) {
- close(c->udpsfd);
- }
-
- return -1;
- }
-
- return EXIT_SUCCESS;
-} /* ms_conn_sock_init */
-
-/**
- * each connection is managed by libevent, this function
- * initialize the event of the connection structure.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_conn_event_init(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- short event_flags = EV_WRITE | EV_PERSIST;
-
- event_set(&c->event, c->sfd, event_flags, ms_event_handler, (void *) c);
- event_base_set(ms_thread->base, &c->event);
- c->ev_flags = event_flags;
-
- if (event_add(&c->event, NULL) == -1) {
- return -1;
- }
-
- return EXIT_SUCCESS;
-} /* ms_conn_event_init */
-
-/**
- * setup a connection, each connection structure of each
- * thread must call this function to initialize.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-int ms_setup_conn(ms_conn_t *c) {
- if (ms_item_win_init(c)) {
- return -1;
- }
-
- if (ms_conn_init(c, conn_write, DATA_BUFFER_SIZE, ms_setting.udp)) {
- return -1;
- }
-
- if (ms_conn_sock_init(c)) {
- return -1;
- }
-
- if (ms_conn_event_init(c)) {
- return -1;
- }
-
- return EXIT_SUCCESS;
-} /* ms_setup_conn */
-
-/**
- * Frees a connection.
- *
- * @param c, pointer of the concurrency
- */
-void ms_conn_free(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- if (c) {
- if (c->hdrbuf)
- free(c->hdrbuf);
- if (c->msglist)
- free(c->msglist);
- if (c->rbuf)
- free(c->rbuf);
- if (c->wbuf)
- free(c->wbuf);
- if (c->iov)
- free(c->iov);
- if (c->mlget_task.mlget_item)
- free(c->mlget_task.mlget_item);
- if (c->rudpbuf)
- free(c->rudpbuf);
- if (c->udppkt)
- free(c->udppkt);
- if (c->item_win)
- free(c->item_win);
- if (c->tcpsfd)
- free(c->tcpsfd);
-
- if (--ms_thread->nactive_conn == 0) {
- free(ms_thread->conn);
- }
- }
-} /* ms_conn_free */
-
-/**
- * close a connection
- *
- * @param c, pointer of the concurrency
- */
-static void ms_conn_close(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- assert(c);
-
- /* delete the event, the socket and the connection */
- event_del(&c->event);
-
- for (uint32_t i = 0; i < c->total_sfds; i++) {
- if (c->tcpsfd[i] > 0) {
- close(c->tcpsfd[i]);
- }
- }
- c->sfd = 0;
-
- if (ms_setting.facebook_test) {
- close(c->udpsfd);
- }
-
- atomic_dec_32(&ms_stats.active_conns);
-
- ms_conn_free(c);
-
- if (ms_setting.run_time == 0) {
- pthread_mutex_lock(&ms_global.run_lock.lock);
- ms_global.run_lock.count++;
- pthread_cond_signal(&ms_global.run_lock.cond);
- pthread_mutex_unlock(&ms_global.run_lock.lock);
- }
-
- if (ms_thread->nactive_conn == 0) {
- event_base_loopbreak(ms_thread->base);
- }
-} /* ms_conn_close */
-
-/**
- * create a new sock
- *
- * @param ai, server address information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_new_socket(struct addrinfo *ai) {
- int sfd;
-
- if ((sfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol)) == -1) {
- fprintf(stderr, "socket() error: %s.\n", strerror(errno));
- return -1;
- }
-
- return sfd;
-} /* ms_new_socket */
-
-/**
- * Sets a socket's send buffer size to the maximum allowed by the system.
- *
- * @param sfd, file descriptor of socket
- */
-static void ms_maximize_sndbuf(const int sfd) {
- socklen_t intsize = sizeof(int);
- unsigned int last_good = 0;
- unsigned int min, max, avg;
- unsigned int old_size;
-
- /* Start with the default size. */
- if (getsockopt(sfd, SOL_SOCKET, SO_SNDBUF, &old_size, &intsize)) {
- fprintf(stderr, "getsockopt(SO_SNDBUF)\n");
- return;
- }
-
- /* Binary-search for the real maximum. */
- min = old_size;
- max = MAX_SENDBUF_SIZE;
-
- while (min <= max) {
- avg = ((unsigned int) (min + max)) / 2;
- if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, (void *) &avg, intsize) == 0) {
- last_good = avg;
- min = avg + 1;
- } else {
- max = avg - 1;
- }
- }
- (void) last_good;
-} /* ms_maximize_sndbuf */
-
-/**
- * socket connects the server
- *
- * @param c, pointer of the concurrency
- * @param srv_host_name, the host name of the server
- * @param srv_port, port of server
- * @param is_udp, whether it's udp
- * @param ret_sfd, the connected socket file descriptor
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_network_connect(ms_conn_t *c, char *srv_host_name, const int srv_port,
- const bool is_udp, int *ret_sfd) {
- int sfd;
- struct linger ling = {0, 0};
- struct addrinfo *ai;
- struct addrinfo *next;
- struct addrinfo hints;
- char port_buf[NI_MAXSERV];
- int error;
- int success = 0;
-
- int flags = 1;
-
- /*
- * the memset call clears nonstandard fields in some impementations
- * that otherwise mess things up.
- */
- memset(&hints, 0, sizeof(hints));
-#ifdef AI_ADDRCONFIG
- hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
-#else
- hints.ai_flags = AI_PASSIVE;
-#endif /* AI_ADDRCONFIG */
- if (is_udp) {
- hints.ai_protocol = IPPROTO_UDP;
- hints.ai_socktype = SOCK_DGRAM;
- hints.ai_family = AF_INET; /* This left here because of issues with OSX 10.5 */
- } else {
- hints.ai_family = AF_UNSPEC;
- hints.ai_protocol = IPPROTO_TCP;
- hints.ai_socktype = SOCK_STREAM;
- }
-
- snprintf(port_buf, NI_MAXSERV, "%d", srv_port);
- error = getaddrinfo(srv_host_name, port_buf, &hints, &ai);
- if (error) {
- if (error != EAI_SYSTEM)
- fprintf(stderr, "getaddrinfo(): %s.\n", gai_strerror(error));
- else
- perror("getaddrinfo()");
-
- return -1;
- }
-
- for (next = ai; next; next = next->ai_next) {
- if ((sfd = ms_new_socket(next)) == -1) {
- freeaddrinfo(ai);
- return -1;
- }
-
- setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, (void *) &flags, sizeof(flags));
- if (is_udp) {
- ms_maximize_sndbuf(sfd);
- } else {
- setsockopt(sfd, SOL_SOCKET, SO_KEEPALIVE, (void *) &flags, sizeof(flags));
- setsockopt(sfd, SOL_SOCKET, SO_LINGER, (void *) &ling, sizeof(ling));
- setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, (void *) &flags, sizeof(flags));
- }
-
- if (is_udp) {
- c->srv_recv_addr_size = sizeof(struct sockaddr);
- memcpy(&c->srv_recv_addr, next->ai_addr, c->srv_recv_addr_size);
- } else {
- if (connect(sfd, next->ai_addr, next->ai_addrlen) == -1) {
- close(sfd);
- freeaddrinfo(ai);
- return -1;
- }
- }
-
- if (((flags = fcntl(sfd, F_GETFL, 0)) < 0) || (fcntl(sfd, F_SETFL, flags | O_NONBLOCK) < 0)) {
- fprintf(stderr, "setting O_NONBLOCK\n");
- close(sfd);
- freeaddrinfo(ai);
- return -1;
- }
-
- if (ret_sfd) {
- *ret_sfd = sfd;
- }
-
- success++;
- }
-
- freeaddrinfo(ai);
-
- /* Return zero if we detected no errors in starting up connections */
- return success == 0;
-} /* ms_network_connect */
-
-/**
- * reconnect a disconnected sock
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_reconn(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- uint32_t srv_idx = 0;
- uint32_t srv_conn_cnt = 0;
-
- if (ms_setting.rep_write_srv > 0) {
- srv_idx = c->cur_idx % ms_setting.srv_cnt;
- srv_conn_cnt = ms_setting.sock_per_conn * ms_setting.nconns;
- } else {
- srv_idx = ms_thread->thread_ctx->srv_idx;
- srv_conn_cnt = ms_setting.nconns / ms_setting.srv_cnt;
- }
-
- /* close the old socket handler */
- close(c->sfd);
- c->tcpsfd[c->cur_idx] = 0;
-
- if (atomic_add_32_nv(&ms_setting.servers[srv_idx].disconn_cnt, 1) % srv_conn_cnt == 0) {
- gettimeofday(&ms_setting.servers[srv_idx].disconn_time, NULL);
- fprintf(stderr, "Server %s:%d disconnect\n", ms_setting.servers[srv_idx].srv_host_name,
- ms_setting.servers[srv_idx].srv_port);
- }
-
- if (ms_setting.rep_write_srv > 0) {
- uint32_t i = 0;
-
- for (i = 0; i < c->total_sfds; i++) {
- if (c->tcpsfd[i]) {
- break;
- }
- }
-
- /* all socks disconnect */
- if (i == c->total_sfds) {
- return -1;
- }
- } else {
- do {
- /* reconnect success, break the loop */
- if (ms_network_connect(c, ms_setting.servers[srv_idx].srv_host_name,
- ms_setting.servers[srv_idx].srv_port, ms_setting.udp, &c->sfd)
- == 0)
- {
- c->tcpsfd[c->cur_idx] = c->sfd;
- if (atomic_add_32_nv(&ms_setting.servers[srv_idx].reconn_cnt, 1) % (uint32_t) srv_conn_cnt
- == 0) {
- gettimeofday(&ms_setting.servers[srv_idx].reconn_time, NULL);
- int reconn_time = (int) (ms_setting.servers[srv_idx].reconn_time.tv_sec
- - ms_setting.servers[srv_idx].disconn_time.tv_sec);
- fprintf(stderr, "Server %s:%d reconnect after %ds\n",
- ms_setting.servers[srv_idx].srv_host_name, ms_setting.servers[srv_idx].srv_port,
- reconn_time);
- }
- break;
- }
-
- if (ms_setting.rep_write_srv == 0 && c->total_sfds > 0) {
- /* wait a second and reconnect */
- sleep(1);
- }
- } while (ms_setting.rep_write_srv == 0 && c->total_sfds > 0);
- }
-
- if ((c->total_sfds > 1) && (c->tcpsfd[c->cur_idx] == 0)) {
- c->sfd = 0;
- c->alive_sfds--;
- }
-
- return EXIT_SUCCESS;
-} /* ms_reconn */
-
-/**
- * reconnect several disconnected socks in the connection
- * structure, the ever-1-second timer of the thread will check
- * whether some socks in the connections disconnect. if
- * disconnect, reconnect the sock.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-int ms_reconn_socks(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- uint32_t srv_idx = 0;
- int ret_sfd = 0;
- uint32_t srv_conn_cnt = 0;
- struct timeval cur_time;
-
- assert(c);
-
- if ((c->total_sfds == 1) || (c->total_sfds == c->alive_sfds)) {
- return EXIT_SUCCESS;
- }
-
- for (uint32_t i = 0; i < c->total_sfds; i++) {
- if (c->tcpsfd[i] == 0) {
- gettimeofday(&cur_time, NULL);
-
- /**
- * For failover test of replication, reconnect the socks after
- * it disconnects more than 5 seconds, Otherwise memslap will
- * block at connect() function and the work threads can't work
- * in this interval.
- */
- if (cur_time.tv_sec - ms_setting.servers[srv_idx].disconn_time.tv_sec < 5) {
- break;
- }
-
- if (ms_setting.rep_write_srv > 0) {
- srv_idx = i % ms_setting.srv_cnt;
- srv_conn_cnt = ms_setting.sock_per_conn * ms_setting.nconns;
- } else {
- srv_idx = ms_thread->thread_ctx->srv_idx;
- srv_conn_cnt = ms_setting.nconns / ms_setting.srv_cnt;
- }
-
- if (ms_network_connect(c, ms_setting.servers[srv_idx].srv_host_name,
- ms_setting.servers[srv_idx].srv_port, ms_setting.udp, &ret_sfd)
- == 0)
- {
- c->tcpsfd[i] = ret_sfd;
- c->alive_sfds++;
-
- if (atomic_add_32_nv(&ms_setting.servers[srv_idx].reconn_cnt, 1) % (uint32_t) srv_conn_cnt
- == 0) {
- gettimeofday(&ms_setting.servers[srv_idx].reconn_time, NULL);
- int reconn_time = (int) (ms_setting.servers[srv_idx].reconn_time.tv_sec
- - ms_setting.servers[srv_idx].disconn_time.tv_sec);
- fprintf(stderr, "Server %s:%d reconnect after %ds\n",
- ms_setting.servers[srv_idx].srv_host_name, ms_setting.servers[srv_idx].srv_port,
- reconn_time);
- }
- }
- }
- }
-
- return EXIT_SUCCESS;
-} /* ms_reconn_socks */
-
-/**
- * Tokenize the command string by replacing whitespace with '\0' and update
- * the token array tokens with pointer to start of each token and length.
- * Returns total number of tokens. The last valid token is the terminal
- * token (value points to the first unprocessed character of the string and
- * length zero).
- *
- * Usage example:
- *
- * while(ms_tokenize_command(command, ncommand, tokens, max_tokens) > 0) {
- * for(int ix = 0; tokens[ix].length; ix++) {
- * ...
- * }
- * ncommand = tokens[ix].value - command;
- * command = tokens[ix].value;
- * }
- *
- * @param command, the command string to token
- * @param tokens, array to store tokens
- * @param max_tokens, maximum tokens number
- *
- * @return int, the number of tokens
- */
-static int ms_tokenize_command(char *command, token_t *tokens, const int max_tokens) {
- char *s, *e;
- int ntokens = 0;
-
- assert(command && tokens && max_tokens > 1);
-
- for (s = e = command; ntokens < max_tokens - 1; ++e) {
- if (*e == ' ') {
- if (s != e) {
- tokens[ntokens].value = s;
- tokens[ntokens].length = (size_t)(e - s);
- ntokens++;
- *e = '\0';
- }
- s = e + 1;
- } else if (*e == '\0') {
- if (s != e) {
- tokens[ntokens].value = s;
- tokens[ntokens].length = (size_t)(e - s);
- ntokens++;
- }
-
- break; /* string end */
- }
- }
-
- return ntokens;
-} /* ms_tokenize_command */
-
-/**
- * parse the response of server.
- *
- * @param c, pointer of the concurrency
- * @param command, the string responded by server
- *
- * @return int, if the command completed return EXIT_SUCCESS, else return
- * -1
- */
-static int ms_ascii_process_line(ms_conn_t *c, char *command) {
- int ret = 0;
- int64_t value_len;
- char *buffer = command;
-
- assert(c);
-
- /**
- * for command get, we store the returned value into local buffer
- * then continue in ms_complete_nread().
- */
-
- switch (buffer[0]) {
- case 'V': /* VALUE || VERSION */
- if (buffer[1] == 'A') /* VALUE */ {
- token_t tokens[MAX_TOKENS];
- ms_tokenize_command(command, tokens, MAX_TOKENS);
- errno = 0;
- value_len = strtol(tokens[VALUELEN_TOKEN].value, NULL, 10);
- if (errno) {
- printf("<%d ERROR %s\n", c->sfd, strerror(errno));
- }
- memcpy(&c->currcmd.key_prefix, tokens[KEY_TOKEN].value, sizeof(c->currcmd.key_prefix));
-
- /*
- * We read the \r\n into the string since not doing so is more
- * cycles then the waster of memory to do so.
- *
- * We are null terminating through, which will most likely make
- * some people lazy about using the return length.
- */
- c->rvbytes = (int) (value_len + 2);
- c->readval = true;
- ret = -1;
- }
-
- break;
-
- case 'O': /* OK */
- c->currcmd.retstat = MCD_SUCCESS;
- break;
-
- case 'S': /* STORED STATS SERVER_ERROR */
- if (buffer[2] == 'A') /* STORED STATS */ { /* STATS*/
- c->currcmd.retstat = MCD_STAT;
- } else if (buffer[1] == 'E') {
- /* SERVER_ERROR */
- printf("<%d %s\n", c->sfd, buffer);
-
- c->currcmd.retstat = MCD_SERVER_ERROR;
- } else if (buffer[1] == 'T') {
- /* STORED */
- c->currcmd.retstat = MCD_STORED;
- } else {
- c->currcmd.retstat = MCD_UNKNOWN_READ_FAILURE;
- }
- break;
-
- case 'D': /* DELETED DATA */
- if (buffer[1] == 'E') {
- c->currcmd.retstat = MCD_DELETED;
- } else {
- c->currcmd.retstat = MCD_UNKNOWN_READ_FAILURE;
- }
-
- break;
-
- case 'N': /* NOT_FOUND NOT_STORED*/
- if (buffer[4] == 'F') {
- c->currcmd.retstat = MCD_NOTFOUND;
- } else if (buffer[4] == 'S') {
- printf("<%d %s\n", c->sfd, buffer);
- c->currcmd.retstat = MCD_NOTSTORED;
- } else {
- c->currcmd.retstat = MCD_UNKNOWN_READ_FAILURE;
- }
- break;
-
- case 'E': /* PROTOCOL ERROR or END */
- if (buffer[1] == 'N') {
- /* END */
- c->currcmd.retstat = MCD_END;
- } else if (buffer[1] == 'R') {
- printf("<%d ERROR\n", c->sfd);
- c->currcmd.retstat = MCD_PROTOCOL_ERROR;
- } else if (buffer[1] == 'X') {
- c->currcmd.retstat = MCD_DATA_EXISTS;
- printf("<%d %s\n", c->sfd, buffer);
- } else {
- c->currcmd.retstat = MCD_UNKNOWN_READ_FAILURE;
- }
- break;
-
- case 'C': /* CLIENT ERROR */
- printf("<%d %s\n", c->sfd, buffer);
- c->currcmd.retstat = MCD_CLIENT_ERROR;
- break;
-
- default:
- c->currcmd.retstat = MCD_UNKNOWN_READ_FAILURE;
- break;
- } /* switch */
-
- return ret;
-} /* ms_ascii_process_line */
-
-/**
- * after one operation completes, reset the concurrency
- *
- * @param c, pointer of the concurrency
- * @param timeout, whether it's timeout
- */
-void ms_reset_conn(ms_conn_t *c, bool timeout) {
- assert(c);
-
- if (c->udp) {
- if ((c->packets > 0) && (c->packets < MAX_UDP_PACKET)) {
- memset(c->udppkt, 0, sizeof(ms_udppkt_t) * (size_t) c->packets);
- }
-
- c->packets = 0;
- c->recvpkt = 0;
- c->pktcurr = 0;
- c->ordcurr = 0;
- c->rudpbytes = 0;
- }
- c->currcmd.isfinish = true;
- c->ctnwrite = false;
- c->rbytes = 0;
- c->rcurr = c->rbuf;
- c->msgcurr = 0;
- c->msgused = 0;
- c->iovused = 0;
- ms_conn_set_state(c, conn_write);
- memcpy(&c->precmd, &c->currcmd, sizeof(ms_cmdstat_t)); /* replicate command state */
-
- if (timeout) {
- ms_drive_machine(c);
- }
-} /* ms_reset_conn */
-
-/**
- * if we have a complete line in the buffer, process it.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_try_read_line(ms_conn_t *c) {
- if (c->protocol == binary_prot) {
- /* Do we have the complete packet header? */
- if ((uint64_t) c->rbytes < sizeof(c->binary_header)) {
- /* need more data! */
- return EXIT_SUCCESS;
- } else {
-#ifdef NEED_ALIGN
- if (((long) (c->rcurr)) % 8) {
- /* must realign input buffer */
- memmove(c->rbuf, c->rcurr, c->rbytes);
- c->rcurr = c->rbuf;
- if (settings.verbose) {
- fprintf(stderr, "%d: Realign input buffer.\n", c->sfd);
- }
- }
-#endif
- protocol_binary_response_header *rsp;
- rsp = (protocol_binary_response_header *) c->rcurr;
-
- c->binary_header = *rsp;
- c->binary_header.response.extlen = rsp->response.extlen;
- c->binary_header.response.keylen = ntohs(rsp->response.keylen);
- c->binary_header.response.bodylen = ntohl(rsp->response.bodylen);
- c->binary_header.response.status = ntohs(rsp->response.status);
-
- if (c->binary_header.response.magic != PROTOCOL_BINARY_RES) {
- fprintf(stderr, "Invalid magic: %x\n", c->binary_header.response.magic);
- ms_conn_set_state(c, conn_closing);
- return EXIT_SUCCESS;
- }
-
- /* process this complete response */
- if (ms_bin_process_response(c) == 0) {
- /* current operation completed */
- ms_reset_conn(c, false);
- return -1;
- } else {
- c->rbytes -= (int32_t) sizeof(c->binary_header);
- c->rcurr += sizeof(c->binary_header);
- }
- }
- } else {
- char *el, *cont;
-
- assert(c);
- assert(c->rcurr <= (c->rbuf + c->rsize));
-
- if (c->rbytes == 0)
- return EXIT_SUCCESS;
-
- el = memchr(c->rcurr, '\n', (size_t) c->rbytes);
- if (!el)
- return EXIT_SUCCESS;
-
- cont = el + 1;
- if (((el - c->rcurr) > 1) && (*(el - 1) == '\r')) {
- el--;
- }
- *el = '\0';
-
- assert(cont <= (c->rcurr + c->rbytes));
-
- /* process this complete line */
- if (ms_ascii_process_line(c, c->rcurr) == 0) {
- /* current operation completed */
- ms_reset_conn(c, false);
- return -1;
- } else {
- /* current operation didn't complete */
- c->rbytes -= (int32_t)(cont - c->rcurr);
- c->rcurr = cont;
- }
-
- assert(c->rcurr <= (c->rbuf + c->rsize));
- }
-
- return -1;
-} /* ms_try_read_line */
-
-/**
- * because the packet of UDP can't ensure the order, the
- * function is used to sort the received udp packet.
- *
- * @param c, pointer of the concurrency
- * @param buf, the buffer to store the ordered packages data
- * @param rbytes, the maximum capacity of the buffer
- *
- * @return int, if success, return the copy bytes, else return
- * -1
- */
-static int ms_sort_udp_packet(ms_conn_t *c, char *buf, int rbytes) {
- int len = 0;
- int wbytes = 0;
- uint16_t req_id = 0;
- uint16_t seq_num = 0;
- uint16_t packets = 0;
- unsigned char *header = NULL;
-
- /* no enough data */
- assert(c);
- assert(buf);
- assert(c->rudpbytes >= UDP_HEADER_SIZE);
-
- /* calculate received packets count */
- if (c->rudpbytes % UDP_MAX_PAYLOAD_SIZE >= UDP_HEADER_SIZE) {
- /* the last packet has some data */
- c->recvpkt = c->rudpbytes / UDP_MAX_PAYLOAD_SIZE + 1;
- } else {
- c->recvpkt = c->rudpbytes / UDP_MAX_PAYLOAD_SIZE;
- }
-
- /* get the total packets count if necessary */
- if (c->packets == 0) {
- c->packets = HEADER_TO_PACKETS((unsigned char *) c->rudpbuf);
- }
-
- /* build the ordered packet array */
- for (int i = c->pktcurr; i < c->recvpkt; i++) {
- header = (unsigned char *) c->rudpbuf + i * UDP_MAX_PAYLOAD_SIZE;
- req_id = (uint16_t) HEADER_TO_REQID(header);
- assert(req_id == c->request_id % (1 << 16));
-
- packets = (uint16_t) HEADER_TO_PACKETS(header);
- assert(c->packets == HEADER_TO_PACKETS(header));
-
- seq_num = (uint16_t) HEADER_TO_SEQNUM(header);
- c->udppkt[seq_num].header = header;
- c->udppkt[seq_num].data = (char *) header + UDP_HEADER_SIZE;
-
- if (i == c->recvpkt - 1) {
- /* last received packet */
- if (c->rudpbytes % UDP_MAX_PAYLOAD_SIZE == 0) {
- c->udppkt[seq_num].rbytes = UDP_MAX_PAYLOAD_SIZE - UDP_HEADER_SIZE;
- c->pktcurr++;
- } else {
- c->udppkt[seq_num].rbytes = c->rudpbytes % UDP_MAX_PAYLOAD_SIZE - UDP_HEADER_SIZE;
- }
- } else {
- c->udppkt[seq_num].rbytes = UDP_MAX_PAYLOAD_SIZE - UDP_HEADER_SIZE;
- c->pktcurr++;
- }
- }
-
- for (int i = c->ordcurr; i < c->recvpkt; i++) {
- /* there is some data to copy */
- if ((c->udppkt[i].data) && (c->udppkt[i].copybytes < c->udppkt[i].rbytes)) {
- header = c->udppkt[i].header;
- len = c->udppkt[i].rbytes - c->udppkt[i].copybytes;
- if (len > rbytes - wbytes) {
- len = rbytes - wbytes;
- }
-
- assert(len <= rbytes - wbytes);
- assert(i == HEADER_TO_SEQNUM(header));
-
- memcpy(buf + wbytes, c->udppkt[i].data + c->udppkt[i].copybytes, (size_t) len);
- wbytes += len;
- c->udppkt[i].copybytes += len;
-
- if ((c->udppkt[i].copybytes == c->udppkt[i].rbytes)
- && (c->udppkt[i].rbytes == UDP_MAX_PAYLOAD_SIZE - UDP_HEADER_SIZE))
- {
- /* finish copying all the data of this packet, next */
- c->ordcurr++;
- }
-
- /* last received packet, and finish copying all the data */
- if ((c->recvpkt == c->packets) && (i == c->recvpkt - 1)
- && (c->udppkt[i].copybytes == c->udppkt[i].rbytes))
- {
- break;
- }
-
- /* no space to copy data */
- if (wbytes >= rbytes) {
- break;
- }
-
- /* it doesn't finish reading all the data of the packet from network */
- if ((i != c->recvpkt - 1) && (c->udppkt[i].rbytes < UDP_MAX_PAYLOAD_SIZE - UDP_HEADER_SIZE)) {
- break;
- }
- } else {
- /* no data to copy */
- break;
- }
- }
- (void) packets;
-
- return wbytes == 0 ? -1 : wbytes;
-} /* ms_sort_udp_packet */
-
-/**
- * encapsulate upd read like tcp read
- *
- * @param c, pointer of the concurrency
- * @param buf, read buffer
- * @param len, length to read
- *
- * @return int, if success, return the read bytes, else return
- * -1
- */
-static int ms_udp_read(ms_conn_t *c, char *buf, int len) {
- int res = 0;
- int avail = 0;
- int rbytes = 0;
- int copybytes = 0;
-
- assert(c->udp);
-
- while (1) {
- if (c->rudpbytes + UDP_MAX_PAYLOAD_SIZE > c->rudpsize) {
- char *new_rbuf = realloc(c->rudpbuf, (size_t) c->rudpsize * 2);
- if (!new_rbuf) {
- fprintf(stderr, "Couldn't realloc input buffer.\n");
- c->rudpbytes = 0; /* ignore what we read */
- return -1;
- }
- c->rudpbuf = new_rbuf;
- c->rudpsize *= 2;
- }
-
- avail = c->rudpsize - c->rudpbytes;
- /* UDP each time read a packet, 1400 bytes */
- res = (int) read(c->sfd, c->rudpbuf + c->rudpbytes, (size_t) avail);
-
- if (res > 0) {
- atomic_add_size(&ms_stats.bytes_read, res);
- c->rudpbytes += res;
- rbytes += res;
- if (res == avail) {
- continue;
- } else {
- break;
- }
- }
-
- if (res == 0) {
- /* "connection" closed */
- return res;
- }
-
- if (res == -1) {
- /* no data to read */
- return res;
- }
- }
-
- /* copy data to read buffer */
- if (rbytes > 0) {
- copybytes = ms_sort_udp_packet(c, buf, len);
- }
-
- if (copybytes == -1) {
- atomic_add_size(&ms_stats.pkt_disorder, 1);
- }
-
- return copybytes;
-} /* ms_udp_read */
-
-/*
- * read from network as much as we can, handle buffer overflow and connection
- * close.
- * before reading, move the remaining incomplete fragment of a command
- * (if any) to the beginning of the buffer.
- * return EXIT_SUCCESS if there's nothing to read on the first read.
- */
-
-/**
- * read from network as much as we can, handle buffer overflow and connection
- * close. before reading, move the remaining incomplete fragment of a command
- * (if any) to the beginning of the buffer.
- *
- * @param c, pointer of the concurrency
- *
- * @return int,
- * return EXIT_SUCCESS if there's nothing to read on the first read.
- * return EXIT_FAILURE if get data
- * return -1 if error happens
- */
-static int ms_try_read_network(ms_conn_t *c) {
- int gotdata = 0;
- int res;
- int64_t avail;
-
- assert(c);
-
- if ((c->rcurr != c->rbuf)
- && (!c->readval || (c->rvbytes > c->rsize - (c->rcurr - c->rbuf))
- || (c->readval && (c->rcurr - c->rbuf > c->rbytes))))
- {
- if (c->rbytes) /* otherwise there's nothing to copy */
- memmove(c->rbuf, c->rcurr, (size_t) c->rbytes);
- c->rcurr = c->rbuf;
- }
-
- while (1) {
- if (c->rbytes >= c->rsize) {
- char *new_rbuf = realloc(c->rbuf, (size_t) c->rsize * 2);
- if (!new_rbuf) {
- fprintf(stderr, "Couldn't realloc input buffer.\n");
- c->rbytes = 0; /* ignore what we read */
- return -1;
- }
- c->rcurr = c->rbuf = new_rbuf;
- c->rsize *= 2;
- }
-
- avail = c->rsize - c->rbytes - (c->rcurr - c->rbuf);
- if (avail == 0) {
- break;
- }
-
- if (c->udp) {
- res = (int32_t) ms_udp_read(c, c->rcurr + c->rbytes, (int32_t) avail);
- } else {
- res = (int) read(c->sfd, c->rcurr + c->rbytes, (size_t) avail);
- }
-
- if (res > 0) {
- if (!c->udp) {
- atomic_add_size(&ms_stats.bytes_read, res);
- }
- gotdata = 1;
- c->rbytes += res;
- if (res == avail) {
- continue;
- } else {
- break;
- }
- }
- if (res == 0) {
- /* connection closed */
- ms_conn_set_state(c, conn_closing);
- return -1;
- }
- if (res == -1) {
- if ((errno == EAGAIN) || (errno == EWOULDBLOCK))
- break;
- /* Should close on unhandled errors. */
- ms_conn_set_state(c, conn_closing);
- return -1;
- }
- }
-
- return gotdata;
-} /* ms_try_read_network */
-
-/**
- * after get the object from server, verify the value if
- * necessary.
- *
- * @param c, pointer of the concurrency
- * @param mlget_item, pointer of mulit-get task item structure
- * @param value, received value string
- * @param vlen, received value string length
- */
-static void ms_verify_value(ms_conn_t *c, ms_mlget_task_item_t *mlget_item, char *value, int vlen) {
- if (c->curr_task.verify) {
- assert(c->curr_task.item->value_offset != INVALID_OFFSET);
- char *orignval = &ms_setting.char_block[c->curr_task.item->value_offset];
- char *orignkey = &ms_setting.char_block[c->curr_task.item->key_suffix_offset];
-
- /* verify expire time if necessary */
- if (c->curr_task.item->exp_time > 0) {
- struct timeval curr_time;
- gettimeofday(&curr_time, NULL);
-
- /* object expired but get it now */
- if (curr_time.tv_sec - c->curr_task.item->client_time
- > c->curr_task.item->exp_time + EXPIRE_TIME_ERROR)
- {
- atomic_add_size(&ms_stats.exp_get, 1);
-
- if (ms_setting.verbose) {
- char set_time[64];
- char cur_time[64];
- strftime(set_time, 64, "%Y-%m-%d %H:%M:%S", localtime(&c->curr_task.item->client_time));
- strftime(cur_time, 64, "%Y-%m-%d %H:%M:%S", localtime(&curr_time.tv_sec));
- fprintf(stderr,
- "\n<%d expire time verification failed, "
- "object expired but get it now\n"
- "\tkey len: %d\n"
- "\tkey: %" PRIx64 " %.*s\n"
- "\tset time: %s current time: %s "
- "diff time: %d expire time: %d\n"
- "\texpected data: \n"
- "\treceived data len: %d\n"
- "\treceived data: %.*s\n",
- c->sfd, c->curr_task.item->key_size, c->curr_task.item->key_prefix,
- c->curr_task.item->key_size - (int) KEY_PREFIX_SIZE, orignkey, set_time, cur_time,
- (int) (curr_time.tv_sec - c->curr_task.item->client_time),
- c->curr_task.item->exp_time, vlen, vlen, value);
- fflush(stderr);
- }
- }
- } else {
- if ((c->curr_task.item->value_size != vlen) || (memcmp(orignval, value, (size_t) vlen)))
- {
- atomic_add_size(&ms_stats.vef_failed, 1);
-
- if (ms_setting.verbose) {
- fprintf(stderr,
- "\n<%d data verification failed\n"
- "\tkey len: %d\n"
- "\tkey: %" PRIx64 " %.*s\n"
- "\texpected data len: %d\n"
- "\texpected data: %.*s\n"
- "\treceived data len: %d\n"
- "\treceived data: %.*s\n",
- c->sfd, c->curr_task.item->key_size, c->curr_task.item->key_prefix,
- c->curr_task.item->key_size - (int) KEY_PREFIX_SIZE, orignkey,
- c->curr_task.item->value_size, c->curr_task.item->value_size, orignval, vlen,
- vlen, value);
- fflush(stderr);
- }
- }
- }
-
- c->curr_task.finish_verify = true;
-
- if (mlget_item) {
- mlget_item->finish_verify = true;
- }
- }
-} /* ms_verify_value */
-
-/**
- * For ASCII protocol, after store the data into the local
- * buffer, run this function to handle the data.
- *
- * @param c, pointer of the concurrency
- */
-static void ms_ascii_complete_nread(ms_conn_t *c) {
- assert(c);
- assert(c->rbytes >= c->rvbytes);
- assert(c->protocol == ascii_prot);
- if (c->rvbytes > 2) {
- assert(c->rcurr[c->rvbytes - 1] == '\n' && c->rcurr[c->rvbytes - 2] == '\r');
- }
-
- /* multi-get */
- ms_mlget_task_item_t *mlget_item = NULL;
- if (((ms_setting.mult_key_num > 1) && (c->mlget_task.mlget_num >= ms_setting.mult_key_num))
- || ((c->remain_exec_num == 0) && (c->mlget_task.mlget_num > 0)))
- {
- c->mlget_task.value_index++;
- mlget_item = &c->mlget_task.mlget_item[c->mlget_task.value_index];
-
- if (mlget_item->item->key_prefix == c->currcmd.key_prefix) {
- c->curr_task.item = mlget_item->item;
- c->curr_task.verify = mlget_item->verify;
- c->curr_task.finish_verify = mlget_item->finish_verify;
- mlget_item->get_miss = false;
- } else {
- /* Try to find the task item in multi-get task array */
- for (int i = 0; i < c->mlget_task.mlget_num; i++) {
- mlget_item = &c->mlget_task.mlget_item[i];
- if (mlget_item->item->key_prefix == c->currcmd.key_prefix) {
- c->curr_task.item = mlget_item->item;
- c->curr_task.verify = mlget_item->verify;
- c->curr_task.finish_verify = mlget_item->finish_verify;
- mlget_item->get_miss = false;
-
- break;
- }
- }
- }
- }
-
- ms_verify_value(c, mlget_item, c->rcurr, c->rvbytes - 2);
-
- c->curr_task.get_miss = false;
- c->rbytes -= c->rvbytes;
- c->rcurr = c->rcurr + c->rvbytes;
- assert(c->rcurr <= (c->rbuf + c->rsize));
- c->readval = false;
- c->rvbytes = 0;
-} /* ms_ascii_complete_nread */
-
-/**
- * For binary protocol, after store the data into the local
- * buffer, run this function to handle the data.
- *
- * @param c, pointer of the concurrency
- */
-static void ms_bin_complete_nread(ms_conn_t *c) {
- assert(c);
- assert(c->rbytes >= c->rvbytes);
- assert(c->protocol == binary_prot);
-
- int extlen = c->binary_header.response.extlen;
- int keylen = c->binary_header.response.keylen;
- uint8_t opcode = c->binary_header.response.opcode;
-
- /* not get command or not include value, just return */
- if (((opcode != PROTOCOL_BINARY_CMD_GET) && (opcode != PROTOCOL_BINARY_CMD_GETQ))
- || (c->rvbytes <= extlen + keylen))
- {
- /* get miss */
- if (c->binary_header.response.opcode == PROTOCOL_BINARY_CMD_GET) {
- c->currcmd.retstat = MCD_END;
- c->curr_task.get_miss = true;
- }
-
- c->readval = false;
- c->rvbytes = 0;
- ms_reset_conn(c, false);
- return;
- }
-
- /* multi-get */
- ms_mlget_task_item_t *mlget_item = NULL;
- if (((ms_setting.mult_key_num > 1) && (c->mlget_task.mlget_num >= ms_setting.mult_key_num))
- || ((c->remain_exec_num == 0) && (c->mlget_task.mlget_num > 0)))
- {
- c->mlget_task.value_index++;
- mlget_item = &c->mlget_task.mlget_item[c->mlget_task.value_index];
-
- c->curr_task.item = mlget_item->item;
- c->curr_task.verify = mlget_item->verify;
- c->curr_task.finish_verify = mlget_item->finish_verify;
- mlget_item->get_miss = false;
- }
-
- ms_verify_value(c, mlget_item, c->rcurr + extlen + keylen, c->rvbytes - extlen - keylen);
-
- c->currcmd.retstat = MCD_END;
- c->curr_task.get_miss = false;
- c->rbytes -= c->rvbytes;
- c->rcurr = c->rcurr + c->rvbytes;
- assert(c->rcurr <= (c->rbuf + c->rsize));
- c->readval = false;
- c->rvbytes = 0;
-
- if (ms_setting.mult_key_num > 1) {
- /* multi-get have check all the item */
- if (c->mlget_task.value_index == c->mlget_task.mlget_num - 1) {
- ms_reset_conn(c, false);
- }
- } else {
- /* single get */
- ms_reset_conn(c, false);
- }
-} /* ms_bin_complete_nread */
-
-/**
- * we get here after reading the value of get commands.
- *
- * @param c, pointer of the concurrency
- */
-static void ms_complete_nread(ms_conn_t *c) {
- assert(c);
- assert(c->rbytes >= c->rvbytes);
- assert(c->protocol == ascii_prot || c->protocol == binary_prot);
-
- if (c->protocol == binary_prot) {
- ms_bin_complete_nread(c);
- } else {
- ms_ascii_complete_nread(c);
- }
-} /* ms_complete_nread */
-
-/**
- * Adds a message header to a connection.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_add_msghdr(ms_conn_t *c) {
- struct msghdr *msg;
-
- assert(c);
-
- if (c->msgsize == c->msgused) {
- msg = realloc(c->msglist, (size_t) c->msgsize * 2 * sizeof(struct msghdr));
- if (!msg)
- return -1;
-
- c->msglist = msg;
- c->msgsize *= 2;
- }
-
- msg = c->msglist + c->msgused;
-
- /**
- * this wipes msg_iovlen, msg_control, msg_controllen, and
- * msg_flags, the last 3 of which aren't defined on solaris:
- */
- memset(msg, 0, sizeof(struct msghdr));
-
- msg->msg_iov = &c->iov[c->iovused];
-
- if (c->udp && (c->srv_recv_addr_size > 0)) {
- msg->msg_name = &c->srv_recv_addr;
- msg->msg_namelen = c->srv_recv_addr_size;
- }
-
- c->msgbytes = 0;
- c->msgused++;
-
- if (c->udp) {
- /* Leave room for the UDP header, which we'll fill in later. */
- return ms_add_iov(c, NULL, UDP_HEADER_SIZE);
- }
-
- return EXIT_SUCCESS;
-} /* ms_add_msghdr */
-
-/**
- * Ensures that there is room for another structure iovec in a connection's
- * iov list.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_ensure_iov_space(ms_conn_t *c) {
- assert(c);
-
- if (c->iovused >= c->iovsize) {
- int i, iovnum;
- struct iovec *new_iov =
- (struct iovec *) realloc(c->iov, ((size_t) c->iovsize * 2) * sizeof(struct iovec));
- if (!new_iov)
- return -1;
-
- c->iov = new_iov;
- c->iovsize *= 2;
-
- /* Point all the msghdr structures at the new list. */
- for (i = 0, iovnum = 0; i < c->msgused; i++) {
- c->msglist[i].msg_iov = &c->iov[iovnum];
- iovnum += (int) c->msglist[i].msg_iovlen;
- }
- }
-
- return EXIT_SUCCESS;
-} /* ms_ensure_iov_space */
-
-/**
- * Adds data to the list of pending data that will be written out to a
- * connection.
- *
- * @param c, pointer of the concurrency
- * @param buf, the buffer includes data to send
- * @param len, the data length in the buffer
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_add_iov(ms_conn_t *c, const void *buf, int len) {
- struct msghdr *m;
- int leftover;
- bool limit_to_mtu;
-
- assert(c);
-
- do {
- m = &c->msglist[c->msgused - 1];
-
- /*
- * Limit UDP packets, to UDP_MAX_PAYLOAD_SIZE bytes.
- */
- limit_to_mtu = c->udp;
-
-#ifdef IOV_MAX
- /* We may need to start a new msghdr if this one is full. */
- if ((m->msg_iovlen == IOV_MAX) || (limit_to_mtu && (c->msgbytes >= UDP_MAX_SEND_PAYLOAD_SIZE)))
- {
- ms_add_msghdr(c);
- m = &c->msglist[c->msgused - 1];
- }
-#endif
-
- if (ms_ensure_iov_space(c))
- return -1;
-
- /* If the fragment is too big to fit in the datagram, split it up */
- if (limit_to_mtu && (len + c->msgbytes > UDP_MAX_SEND_PAYLOAD_SIZE)) {
- leftover = len + c->msgbytes - UDP_MAX_SEND_PAYLOAD_SIZE;
- len -= leftover;
- } else {
- leftover = 0;
- }
-
- m = &c->msglist[c->msgused - 1];
- m->msg_iov[m->msg_iovlen].iov_base = (void *) buf;
- m->msg_iov[m->msg_iovlen].iov_len = (size_t) len;
-
- c->msgbytes += len;
- c->iovused++;
- m->msg_iovlen++;
-
- buf = ((char *) buf) + len;
- len = leftover;
- } while (leftover > 0);
-
- return EXIT_SUCCESS;
-} /* ms_add_iov */
-
-/**
- * Constructs a set of UDP headers and attaches them to the outgoing messages.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_build_udp_headers(ms_conn_t *c) {
- int i;
- unsigned char *hdr;
-
- assert(c);
-
- c->request_id = ms_get_udp_request_id();
-
- if (c->msgused > c->hdrsize) {
- void *new_hdrbuf;
- if (c->hdrbuf)
- new_hdrbuf = realloc(c->hdrbuf, (size_t) c->msgused * 2 * UDP_HEADER_SIZE);
- else
- new_hdrbuf = malloc((size_t) c->msgused * 2 * UDP_HEADER_SIZE);
- if (!new_hdrbuf)
- return -1;
-
- c->hdrbuf = (unsigned char *) new_hdrbuf;
- c->hdrsize = c->msgused * 2;
- }
-
- /* If this is a multi-packet request, drop it. */
- if (c->udp && (c->msgused > 1)) {
- fprintf(stderr, "multi-packet request for UDP not supported.\n");
- return -1;
- }
-
- hdr = c->hdrbuf;
- for (i = 0; i < c->msgused; i++) {
- c->msglist[i].msg_iov[0].iov_base = (void *) hdr;
- c->msglist[i].msg_iov[0].iov_len = UDP_HEADER_SIZE;
- *hdr++ = (unsigned char) (c->request_id / 256);
- *hdr++ = (unsigned char) (c->request_id % 256);
- *hdr++ = (unsigned char) (i / 256);
- *hdr++ = (unsigned char) (i % 256);
- *hdr++ = (unsigned char) (c->msgused / 256);
- *hdr++ = (unsigned char) (c->msgused % 256);
- *hdr++ = (unsigned char) 1; /* support facebook memcached */
- *hdr++ = (unsigned char) 0;
- assert(hdr == ((unsigned char *) c->msglist[i].msg_iov[0].iov_base + UDP_HEADER_SIZE));
- }
-
- return EXIT_SUCCESS;
-} /* ms_build_udp_headers */
-
-/**
- * Transmit the next chunk of data from our list of msgbuf structures.
- *
- * @param c, pointer of the concurrency
- *
- * @return TRANSMIT_COMPLETE All done writing.
- * TRANSMIT_INCOMPLETE More data remaining to write.
- * TRANSMIT_SOFT_ERROR Can't write any more right now.
- * TRANSMIT_HARD_ERROR Can't write (c->state is set to conn_closing)
- */
-static int ms_transmit(ms_conn_t *c) {
- assert(c);
-
- if ((c->msgcurr < c->msgused) && (c->msglist[c->msgcurr].msg_iovlen == 0)) {
- /* Finished writing the current msg; advance to the next. */
- c->msgcurr++;
- }
-
- if (c->msgcurr < c->msgused) {
- ssize_t res;
- struct msghdr *m = &c->msglist[c->msgcurr];
-
- res = sendmsg(c->sfd, m, 0);
- if (res > 0) {
- atomic_add_size(&ms_stats.bytes_written, res);
-
- /* We've written some of the data. Remove the completed
- * iovec entries from the list of pending writes. */
- while (m->msg_iovlen > 0 && res >= (ssize_t) m->msg_iov->iov_len) {
- res -= (ssize_t) m->msg_iov->iov_len;
- m->msg_iovlen--;
- m->msg_iov++;
- }
-
- /* Might have written just part of the last iovec entry;
- * adjust it so the next write will do the rest. */
- if (res > 0) {
- m->msg_iov->iov_base = (void *) ((unsigned char *) m->msg_iov->iov_base + res);
- m->msg_iov->iov_len -= (size_t) res;
- }
- return TRANSMIT_INCOMPLETE;
- }
- if ((res == -1) && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
- if (!ms_update_event(c, EV_WRITE | EV_PERSIST)) {
- fprintf(stderr, "Couldn't update event.\n");
- ms_conn_set_state(c, conn_closing);
- return TRANSMIT_HARD_ERROR;
- }
- return TRANSMIT_SOFT_ERROR;
- }
-
- /* if res==0 or res==-1 and error is not EAGAIN or EWOULDBLOCK,
- * we have a real error, on which we close the connection */
- fprintf(stderr, "Failed to write, and not due to blocking.\n");
-
- ms_conn_set_state(c, conn_closing);
- return TRANSMIT_HARD_ERROR;
- } else {
- return TRANSMIT_COMPLETE;
- }
-} /* ms_transmit */
-
-/**
- * Shrinks a connection's buffers if they're too big. This prevents
- * periodic large "mget" response from server chewing lots of client
- * memory.
- *
- * This should only be called in between requests since it can wipe output
- * buffers!
- *
- * @param c, pointer of the concurrency
- */
-static void ms_conn_shrink(ms_conn_t *c) {
- assert(c);
-
- if (c->udp)
- return;
-
- if ((c->rsize > READ_BUFFER_HIGHWAT) && (c->rbytes < DATA_BUFFER_SIZE)) {
- char *newbuf;
-
- if (c->rcurr != c->rbuf)
- memmove(c->rbuf, c->rcurr, (size_t) c->rbytes);
-
- newbuf = (char *) realloc((void *) c->rbuf, DATA_BUFFER_SIZE);
-
- if (newbuf) {
- c->rbuf = newbuf;
- c->rsize = DATA_BUFFER_SIZE;
- }
- c->rcurr = c->rbuf;
- }
-
- if (c->udp && (c->rudpsize > UDP_DATA_BUFFER_HIGHWAT)
- && (c->rudpbytes + UDP_MAX_PAYLOAD_SIZE < UDP_DATA_BUFFER_SIZE))
- {
- char *new_rbuf = (char *) realloc(c->rudpbuf, (size_t) c->rudpsize * 2);
- if (new_rbuf) {
- c->rudpbuf = new_rbuf;
- c->rudpsize = UDP_DATA_BUFFER_SIZE;
- }
- /* TODO check error condition? */
- }
-
- if (c->msgsize > MSG_LIST_HIGHWAT) {
- struct msghdr *newbuf =
- (struct msghdr *) realloc((void *) c->msglist, MSG_LIST_INITIAL * sizeof(c->msglist[0]));
- if (newbuf) {
- c->msglist = newbuf;
- c->msgsize = MSG_LIST_INITIAL;
- }
- /* TODO check error condition? */
- }
-
- if (c->iovsize > IOV_LIST_HIGHWAT) {
- struct iovec *newbuf =
- (struct iovec *) realloc((void *) c->iov, IOV_LIST_INITIAL * sizeof(c->iov[0]));
- if (newbuf) {
- c->iov = newbuf;
- c->iovsize = IOV_LIST_INITIAL;
- }
- /* TODO check return value */
- }
-} /* ms_conn_shrink */
-
-/**
- * Sets a connection's current state in the state machine. Any special
- * processing that needs to happen on certain state transitions can
- * happen here.
- *
- * @param c, pointer of the concurrency
- * @param state, connection state
- */
-static void ms_conn_set_state(ms_conn_t *c, int state) {
- assert(c);
-
- if (state != c->state) {
- if (state == conn_read) {
- ms_conn_shrink(c);
- }
- c->state = state;
- }
-} /* ms_conn_set_state */
-
-/**
- * update the event if socks change state. for example: when
- * change the listen scoket read event to sock write event, or
- * change socket handler, we could call this function.
- *
- * @param c, pointer of the concurrency
- * @param new_flags, new event flags
- *
- * @return bool, if success, return true, else return false
- */
-static bool ms_update_event(ms_conn_t *c, const int new_flags) {
- assert(c);
-
- struct event_base *base = c->event.ev_base;
- if ((c->ev_flags == new_flags) && (ms_setting.rep_write_srv == 0)
- && (!ms_setting.facebook_test || (c->total_sfds == 1)))
- {
- return true;
- }
-
- if (event_del(&c->event) == -1) {
- /* try to delete the event again */
- if (event_del(&c->event) == -1) {
- return false;
- }
- }
-
- event_set(&c->event, c->sfd, (short) new_flags, ms_event_handler, (void *) c);
- event_base_set(base, &c->event);
- c->ev_flags = (short) new_flags;
-
- if (event_add(&c->event, NULL) == -1) {
- return false;
- }
-
- return true;
-} /* ms_update_event */
-
-/**
- * If user want to get the expected throughput, we could limit
- * the performance of memslap. we could give up some work and
- * just wait a short time. The function is used to check this
- * case.
- *
- * @param c, pointer of the concurrency
- *
- * @return bool, if success, return true, else return false
- */
-static bool ms_need_yield(ms_conn_t *c) {
- ms_thread_t *ms_thread = pthread_getspecific(ms_thread_key);
- int64_t tps = 0;
- int64_t time_diff = 0;
- struct timeval curr_time;
- ms_task_t *task = &c->curr_task;
-
- if (ms_setting.expected_tps > 0) {
- gettimeofday(&curr_time, NULL);
- time_diff = ms_time_diff(&ms_thread->startup_time, &curr_time);
- tps = (int64_t)(((task->get_opt + task->set_opt) / (uint64_t) time_diff) * 1000000);
-
- /* current throughput is greater than expected throughput */
- if (tps > ms_thread->thread_ctx->tps_perconn) {
- return true;
- }
- }
-
- return false;
-} /* ms_need_yield */
-
-/**
- * used to update the start time of each operation
- *
- * @param c, pointer of the concurrency
- */
-static void ms_update_start_time(ms_conn_t *c) {
- ms_task_item_t *item = c->curr_task.item;
-
- if ((ms_setting.stat_freq > 0) || c->udp || ((c->currcmd.cmd == CMD_SET) && (item->exp_time > 0)))
- {
- gettimeofday(&c->start_time, NULL);
- if ((c->currcmd.cmd == CMD_SET) && (item->exp_time > 0)) {
- /* record the current time */
- item->client_time = c->start_time.tv_sec;
- }
- }
-} /* ms_update_start_time */
-
-/**
- * run the state machine
- *
- * @param c, pointer of the concurrency
- */
-static void ms_drive_machine(ms_conn_t *c) {
- bool stop = false;
-
- assert(c);
-
- while (!stop) {
- switch (c->state) {
- case conn_read:
- if (c->readval) {
- if (c->rbytes >= c->rvbytes) {
- ms_complete_nread(c);
- break;
- }
- } else {
- if (ms_try_read_line(c)) {
- break;
- }
- }
-
- if (ms_try_read_network(c)) {
- break;
- }
-
- /* doesn't read all the response data, wait event wake up */
- if (!c->currcmd.isfinish) {
- if (!ms_update_event(c, EV_READ | EV_PERSIST)) {
- fprintf(stderr, "Couldn't update event.\n");
- ms_conn_set_state(c, conn_closing);
- break;
- }
- stop = true;
- break;
- }
-
- /* we have no command line and no data to read from network, next write */
- ms_conn_set_state(c, conn_write);
- memcpy(&c->precmd, &c->currcmd, sizeof(ms_cmdstat_t)); /* replicate command state */
-
- break;
-
- case conn_write:
- if (!c->ctnwrite && ms_need_yield(c)) {
- usleep(10);
-
- if (!ms_update_event(c, EV_WRITE | EV_PERSIST)) {
- fprintf(stderr, "Couldn't update event.\n");
- ms_conn_set_state(c, conn_closing);
- break;
- }
- stop = true;
- break;
- }
-
- if (!c->ctnwrite && (ms_exec_task(c))) {
- ms_conn_set_state(c, conn_closing);
- break;
- }
-
- /* record the start time before starting to send data if necessary */
- if (!c->ctnwrite || (c->change_sfd && c->ctnwrite)) {
- if (c->change_sfd) {
- c->change_sfd = false;
- }
- ms_update_start_time(c);
- }
-
- /* change sfd if necessary */
- if (c->change_sfd) {
- c->ctnwrite = true;
- stop = true;
- break;
- }
-
- /* execute task until nothing need be written to network */
- if (!c->ctnwrite && (c->msgcurr == c->msgused)) {
- if (!ms_update_event(c, EV_WRITE | EV_PERSIST)) {
- fprintf(stderr, "Couldn't update event.\n");
- ms_conn_set_state(c, conn_closing);
- break;
- }
- stop = true;
- break;
- }
-
- switch (ms_transmit(c)) {
- case TRANSMIT_COMPLETE:
- /* we have no data to write to network, next wait repose */
- if (!ms_update_event(c, EV_READ | EV_PERSIST)) {
- fprintf(stderr, "Couldn't update event.\n");
- ms_conn_set_state(c, conn_closing);
- c->ctnwrite = false;
- break;
- }
- ms_conn_set_state(c, conn_read);
- c->ctnwrite = false;
- stop = true;
- break;
-
- case TRANSMIT_INCOMPLETE:
- c->ctnwrite = true;
- break; /* Continue in state machine. */
-
- case TRANSMIT_HARD_ERROR:
- c->ctnwrite = false;
- break;
-
- case TRANSMIT_SOFT_ERROR:
- c->ctnwrite = true;
- stop = true;
- break;
-
- default:
- break;
- } /* switch */
-
- break;
-
- case conn_closing:
- /* recovery mode, need reconnect if connection close */
- if (ms_setting.reconnect
- && (!ms_global.time_out || ((ms_setting.run_time == 0) && (c->remain_exec_num > 0))))
- {
- if (ms_reconn(c)) {
- ms_conn_close(c);
- stop = true;
- break;
- }
-
- ms_reset_conn(c, false);
-
- if (c->total_sfds == 1) {
- if (!ms_update_event(c, EV_WRITE | EV_PERSIST)) {
- fprintf(stderr, "Couldn't update event.\n");
- ms_conn_set_state(c, conn_closing);
- break;
- }
- }
-
- break;
- } else {
- ms_conn_close(c);
- stop = true;
- break;
- }
-
- default:
- assert(0);
- } /* switch */
- }
-} /* ms_drive_machine */
-
-/**
- * the event handler of each thread
- *
- * @param fd, the file descriptor of socket
- * @param which, event flag
- * @param arg, argument
- */
-void ms_event_handler(const int fd, const short which, void *arg) {
- ms_conn_t *c = (ms_conn_t *) arg;
-
- assert(c);
-
- c->which = which;
-
- /* sanity */
- if (fd != c->sfd) {
- fprintf(stderr, "Catastrophic: event fd: %d doesn't match conn fd: %d\n", fd, c->sfd);
- ms_conn_close(c);
- exit(1);
- }
- assert(fd == c->sfd);
-
- ms_drive_machine(c);
-
- /* wait for next event */
-} /* ms_event_handler */
-
-/**
- * get the next socket descriptor index to run for replication
- *
- * @param c, pointer of the concurrency
- * @param cmd, command(get or set )
- *
- * @return int, if success, return the index, else return EXIT_SUCCESS
- */
-static uint32_t ms_get_rep_sock_index(ms_conn_t *c, int cmd) {
- uint32_t sock_index = 0;
- uint32_t i = 0;
-
- if (c->total_sfds == 1) {
- return EXIT_SUCCESS;
- }
-
- if (ms_setting.rep_write_srv == 0) {
- return sock_index;
- }
-
- do {
- if (cmd == CMD_SET) {
- for (i = 0; i < ms_setting.rep_write_srv; i++) {
- if (c->tcpsfd[i] > 0) {
- break;
- }
- }
-
- if (i == ms_setting.rep_write_srv) {
- /* random get one replication server to read */
- sock_index = (uint32_t) random() % c->total_sfds;
- } else {
- /* random get one replication writing server to write */
- sock_index = (uint32_t) random() % ms_setting.rep_write_srv;
- }
- } else if (cmd == CMD_GET) {
- /* random get one replication server to read */
- sock_index = (uint32_t) random() % c->total_sfds;
- }
- } while (c->tcpsfd[sock_index] == 0);
-
- return sock_index;
-} /* ms_get_rep_sock_index */
-
-/**
- * get the next socket descriptor index to run
- *
- * @param c, pointer of the concurrency
- *
- * @return int, return the index
- */
-static uint32_t ms_get_next_sock_index(ms_conn_t *c) {
- uint32_t sock_index = 0;
-
- do {
- sock_index = (++c->cur_idx == c->total_sfds) ? 0 : c->cur_idx;
- } while (c->tcpsfd[sock_index] == 0);
-
- return sock_index;
-} /* ms_get_next_sock_index */
-
-/**
- * update socket event of the connections
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_update_conn_sock_event(ms_conn_t *c) {
- assert(c);
-
- switch (c->currcmd.cmd) {
- case CMD_SET:
- if (ms_setting.facebook_test && c->udp) {
- c->sfd = c->tcpsfd[0];
- c->udp = false;
- c->change_sfd = true;
- }
- break;
-
- case CMD_GET:
- if (ms_setting.facebook_test && !c->udp) {
- c->sfd = c->udpsfd;
- c->udp = true;
- c->change_sfd = true;
- }
- break;
-
- default:
- break;
- } /* switch */
-
- if (!c->udp && (c->total_sfds > 1)) {
- if (c->cur_idx != c->total_sfds) {
- if (ms_setting.rep_write_srv == 0) {
- c->cur_idx = ms_get_next_sock_index(c);
- } else {
- c->cur_idx = ms_get_rep_sock_index(c, c->currcmd.cmd);
- }
- } else {
- /* must select the first sock of the connection at the beginning */
- c->cur_idx = 0;
- }
-
- c->sfd = c->tcpsfd[c->cur_idx];
- assert(c->sfd);
- c->change_sfd = true;
- }
-
- if (c->change_sfd) {
- if (!ms_update_event(c, EV_WRITE | EV_PERSIST)) {
- fprintf(stderr, "Couldn't update event.\n");
- ms_conn_set_state(c, conn_closing);
- return -1;
- }
- }
-
- return EXIT_SUCCESS;
-} /* ms_update_conn_sock_event */
-
-/**
- * for ASCII protocol, this function build the set command
- * string and send the command.
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_build_ascii_write_buf_set(ms_conn_t *c, ms_task_item_t *item) {
- int value_offset;
- int write_len;
- char *buffer = c->wbuf;
-
- write_len = snprintf(buffer, c->wsize, " %u %d %d\r\n", 0, item->exp_time, item->value_size);
-
- if (write_len > c->wsize || write_len < 0) {
- /* ought to be always enough. just fail for simplicity */
- fprintf(stderr, "output command line too long.\n");
- return -1;
- }
-
- if (item->value_offset == INVALID_OFFSET) {
- value_offset = item->key_suffix_offset;
- } else {
- value_offset = item->value_offset;
- }
-
- if ((ms_add_iov(c, "set ", 4))
- || (ms_add_iov(c, (char *) &item->key_prefix, (int) KEY_PREFIX_SIZE))
- || (ms_add_iov(c, &ms_setting.char_block[item->key_suffix_offset],
- item->key_size - (int) KEY_PREFIX_SIZE)
-)
- || (ms_add_iov(c, buffer, write_len))
- || (ms_add_iov(c, &ms_setting.char_block[value_offset], item->value_size))
- || (ms_add_iov(c, "\r\n", 2)) || (c->udp && (ms_build_udp_headers(c))))
- {
- return -1;
- }
-
- return EXIT_SUCCESS;
-} /* ms_build_ascii_write_buf_set */
-
-/**
- * used to send set command to server
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-int ms_mcd_set(ms_conn_t *c, ms_task_item_t *item) {
- assert(c);
-
- c->currcmd.cmd = CMD_SET;
- c->currcmd.isfinish = false;
- c->currcmd.retstat = MCD_FAILURE;
-
- if (ms_update_conn_sock_event(c)) {
- return -1;
- }
-
- c->msgcurr = 0;
- c->msgused = 0;
- c->iovused = 0;
- if (ms_add_msghdr(c)) {
- fprintf(stderr, "Out of memory preparing request.");
- return -1;
- }
-
- /* binary protocol */
- if (c->protocol == binary_prot) {
- if (ms_build_bin_write_buf_set(c, item)) {
- return -1;
- }
- } else {
- if (ms_build_ascii_write_buf_set(c, item)) {
- return -1;
- }
- }
-
- atomic_add_size(&ms_stats.obj_bytes, item->key_size + item->value_size);
- atomic_add_size(&ms_stats.cmd_set, 1);
-
- return EXIT_SUCCESS;
-} /* ms_mcd_set */
-
-/**
- * for ASCII protocol, this function build the get command
- * string and send the command.
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_build_ascii_write_buf_get(ms_conn_t *c, ms_task_item_t *item) {
- if ((ms_add_iov(c, "get ", 4))
- || (ms_add_iov(c, (char *) &item->key_prefix, (int) KEY_PREFIX_SIZE))
- || (ms_add_iov(c, &ms_setting.char_block[item->key_suffix_offset],
- item->key_size - (int) KEY_PREFIX_SIZE)
-)
- || (ms_add_iov(c, "\r\n", 2)) || (c->udp && (ms_build_udp_headers(c))))
- {
- return -1;
- }
-
- return EXIT_SUCCESS;
-} /* ms_build_ascii_write_buf_get */
-
-/**
- * used to send the get command to server
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-int ms_mcd_get(ms_conn_t *c, ms_task_item_t *item) {
- assert(c);
-
- c->currcmd.cmd = CMD_GET;
- c->currcmd.isfinish = false;
- c->currcmd.retstat = MCD_FAILURE;
-
- if (ms_update_conn_sock_event(c)) {
- return -1;
- }
-
- c->msgcurr = 0;
- c->msgused = 0;
- c->iovused = 0;
- if (ms_add_msghdr(c)) {
- fprintf(stderr, "Out of memory preparing request.");
- return -1;
- }
-
- /* binary protocol */
- if (c->protocol == binary_prot) {
- if (ms_build_bin_write_buf_get(c, item)) {
- return -1;
- }
- } else {
- if (ms_build_ascii_write_buf_get(c, item)) {
- return -1;
- }
- }
-
- atomic_add_size(&ms_stats.cmd_get, 1);
-
- return EXIT_SUCCESS;
-} /* ms_mcd_get */
-
-/**
- * for ASCII protocol, this function build the multi-get command
- * string and send the command.
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_build_ascii_write_buf_mlget(ms_conn_t *c) {
- ms_task_item_t *item;
-
- if (ms_add_iov(c, "get", 3)) {
- return -1;
- }
-
- for (int i = 0; i < c->mlget_task.mlget_num; i++) {
- item = c->mlget_task.mlget_item[i].item;
- assert(item);
- if ((ms_add_iov(c, " ", 1))
- || (ms_add_iov(c, (char *) &item->key_prefix, (int) KEY_PREFIX_SIZE))
- || (ms_add_iov(c, &ms_setting.char_block[item->key_suffix_offset],
- item->key_size - (int) KEY_PREFIX_SIZE)
-))
- {
- return -1;
- }
- }
-
- if ((ms_add_iov(c, "\r\n", 2)) || (c->udp && (ms_build_udp_headers(c)))) {
- return -1;
- }
-
- return EXIT_SUCCESS;
-} /* ms_build_ascii_write_buf_mlget */
-
-/**
- * used to send the multi-get command to server
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-int ms_mcd_mlget(ms_conn_t *c) {
- ms_task_item_t *item;
-
- assert(c);
- assert(c->mlget_task.mlget_num >= 1);
-
- c->currcmd.cmd = CMD_GET;
- c->currcmd.isfinish = false;
- c->currcmd.retstat = MCD_FAILURE;
-
- if (ms_update_conn_sock_event(c)) {
- return -1;
- }
-
- c->msgcurr = 0;
- c->msgused = 0;
- c->iovused = 0;
- if (ms_add_msghdr(c)) {
- fprintf(stderr, "Out of memory preparing request.");
- return -1;
- }
-
- /* binary protocol */
- if (c->protocol == binary_prot) {
- if (ms_build_bin_write_buf_mlget(c)) {
- return -1;
- }
- } else {
- if (ms_build_ascii_write_buf_mlget(c)) {
- return -1;
- }
- }
-
- /* decrease operation time of each item */
- for (int i = 0; i < c->mlget_task.mlget_num; i++) {
- item = c->mlget_task.mlget_item[i].item;
- atomic_add_size(&ms_stats.cmd_get, 1);
- }
-
- (void) item;
-
- return EXIT_SUCCESS;
-} /* ms_mcd_mlget */
-
-/**
- * binary protocol support
- */
-
-/**
- * for binary protocol, parse the response of server
- *
- * @param c, pointer of the concurrency
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_bin_process_response(ms_conn_t *c) {
- const char *errstr = NULL;
-
- assert(c);
-
- uint32_t bodylen = c->binary_header.response.bodylen;
- uint8_t opcode = c->binary_header.response.opcode;
- uint16_t status = c->binary_header.response.status;
-
- if (bodylen > 0) {
- c->rvbytes = (int32_t) bodylen;
- c->readval = true;
- return EXIT_FAILURE;
- } else {
- switch (status) {
- case PROTOCOL_BINARY_RESPONSE_SUCCESS:
- if (opcode == PROTOCOL_BINARY_CMD_SET) {
- c->currcmd.retstat = MCD_STORED;
- } else if (opcode == PROTOCOL_BINARY_CMD_DELETE) {
- c->currcmd.retstat = MCD_DELETED;
- } else if (opcode == PROTOCOL_BINARY_CMD_GET) {
- c->currcmd.retstat = MCD_END;
- }
- break;
-
- case PROTOCOL_BINARY_RESPONSE_ENOMEM:
- errstr = "Out of memory";
- c->currcmd.retstat = MCD_SERVER_ERROR;
- break;
-
- case PROTOCOL_BINARY_RESPONSE_UNKNOWN_COMMAND:
- errstr = "Unknown command";
- c->currcmd.retstat = MCD_UNKNOWN_READ_FAILURE;
- break;
-
- case PROTOCOL_BINARY_RESPONSE_KEY_ENOENT:
- errstr = "Not found";
- c->currcmd.retstat = MCD_NOTFOUND;
- break;
-
- case PROTOCOL_BINARY_RESPONSE_EINVAL:
- errstr = "Invalid arguments";
- c->currcmd.retstat = MCD_PROTOCOL_ERROR;
- break;
-
- case PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS:
- errstr = "Data exists for key.";
- break;
-
- case PROTOCOL_BINARY_RESPONSE_E2BIG:
- errstr = "Too large.";
- c->currcmd.retstat = MCD_SERVER_ERROR;
- break;
-
- case PROTOCOL_BINARY_RESPONSE_NOT_STORED:
- errstr = "Not stored.";
- c->currcmd.retstat = MCD_NOTSTORED;
- break;
-
- default:
- errstr = "Unknown error";
- c->currcmd.retstat = MCD_UNKNOWN_READ_FAILURE;
- break;
- } /* switch */
-
- if (errstr) {
- fprintf(stderr, "%s\n", errstr);
- }
- }
-
- return EXIT_SUCCESS;
-} /* ms_bin_process_response */
-
-/* build binary header and add the header to the buffer to send */
-
-/**
- * build binary header and add the header to the buffer to send
- *
- * @param c, pointer of the concurrency
- * @param opcode, operation code
- * @param hdr_len, length of header
- * @param key_len, length of key
- * @param body_len. length of body
- */
-static void ms_add_bin_header(ms_conn_t *c, uint8_t opcode, uint8_t hdr_len, uint16_t key_len,
- uint32_t body_len) {
- protocol_binary_request_header *header;
-
- assert(c);
-
- header = (protocol_binary_request_header *) c->wcurr;
-
- header->request.magic = (uint8_t) PROTOCOL_BINARY_REQ;
- header->request.opcode = (uint8_t) opcode;
- header->request.keylen = htons(key_len);
-
- header->request.extlen = (uint8_t) hdr_len;
- header->request.datatype = (uint8_t) PROTOCOL_BINARY_RAW_BYTES;
- header->request.vbucket = 0;
-
- header->request.bodylen = htonl(body_len);
- header->request.opaque = 0;
- header->request.cas = 0;
-
- ms_add_iov(c, c->wcurr, sizeof(header->request));
-} /* ms_add_bin_header */
-
-/**
- * add the key to the socket write buffer array
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- */
-static void ms_add_key_to_iov(ms_conn_t *c, ms_task_item_t *item) {
- ms_add_iov(c, (char *) &item->key_prefix, (int) KEY_PREFIX_SIZE);
- ms_add_iov(c, &ms_setting.char_block[item->key_suffix_offset],
- item->key_size - (int) KEY_PREFIX_SIZE);
-}
-
-/**
- * for binary protocol, this function build the set command
- * and add the command to send buffer array.
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_build_bin_write_buf_set(ms_conn_t *c, ms_task_item_t *item) {
- assert(c->wbuf == c->wcurr);
-
- int value_offset;
- protocol_binary_request_set *rep = (protocol_binary_request_set *) c->wcurr;
- uint16_t keylen = (uint16_t) item->key_size;
- uint32_t bodylen =
- (uint32_t) sizeof(rep->message.body) + (uint32_t) keylen + (uint32_t) item->value_size;
-
- ms_add_bin_header(c, PROTOCOL_BINARY_CMD_SET, sizeof(rep->message.body), keylen, bodylen);
- rep->message.body.flags = 0;
- rep->message.body.expiration = htonl((uint32_t) item->exp_time);
- ms_add_iov(c, &rep->message.body, sizeof(rep->message.body));
- ms_add_key_to_iov(c, item);
-
- if (item->value_offset == INVALID_OFFSET) {
- value_offset = item->key_suffix_offset;
- } else {
- value_offset = item->value_offset;
- }
- ms_add_iov(c, &ms_setting.char_block[value_offset], item->value_size);
-
- return EXIT_SUCCESS;
-} /* ms_build_bin_write_buf_set */
-
-/**
- * for binary protocol, this function build the get command and
- * add the command to send buffer array.
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_build_bin_write_buf_get(ms_conn_t *c, ms_task_item_t *item) {
- assert(c->wbuf == c->wcurr);
-
- ms_add_bin_header(c, PROTOCOL_BINARY_CMD_GET, 0, (uint16_t) item->key_size,
- (uint32_t) item->key_size);
- ms_add_key_to_iov(c, item);
-
- return EXIT_SUCCESS;
-} /* ms_build_bin_write_buf_get */
-
-/**
- * for binary protocol, this function build the multi-get
- * command and add the command to send buffer array.
- *
- * @param c, pointer of the concurrency
- * @param item, pointer of task item which includes the object
- * information
- *
- * @return int, if success, return EXIT_SUCCESS, else return -1
- */
-static int ms_build_bin_write_buf_mlget(ms_conn_t *c) {
- ms_task_item_t *item;
-
- assert(c->wbuf == c->wcurr);
-
- for (int i = 0; i < c->mlget_task.mlget_num; i++) {
- item = c->mlget_task.mlget_item[i].item;
- assert(item);
-
- ms_add_bin_header(c, PROTOCOL_BINARY_CMD_GET, 0, (uint16_t) item->key_size,
- (uint32_t) item->key_size);
- ms_add_key_to_iov(c, item);
- c->wcurr += sizeof(protocol_binary_request_get);
- }
-
- c->wcurr = c->wbuf;
-
- return EXIT_SUCCESS;
-} /* ms_build_bin_write_buf_mlget */
projects / awesomized / libmemcached / blobdiff