--- /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