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nsmemcache.c
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/*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* Copyright (C) 2001-2006 Vlad Seryakov
* All rights reserved.
*
* Alternatively, the contents of this file may be used under the terms
* of the GNU General Public License (the "GPL"), in which case the
* provisions of GPL are applicable instead of those above. If you wish
* to allow use of your version of this file only under the terms of the
* GPL and not to allow others to use your version of this file under the
* License, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the GPL.
* If you do not delete the provisions above, a recipient may use your
* version of this file under either the License or the GPL.
*/
/*
* nsmemcache.c -- memcached client
*
*
* Authors
*
* Vlad Seryakov [email protected]
*
*/
#include "ns.h"
#include "nsmemfunc.h"
#include "nsmemsock.h"
#define BUFSIZE 2048 /* Internal buffer size for read/write */
#define TIMEOUT 2 /* For how long to wait for responses */
#define DEADTIME 5 /* Period to ping dead servers */
#define PORT 11211
#define MC_SERVER_LIVE 0 /* Server is alive and responding to requests */
#define MC_SERVER_DEAD 1 /* Server is not responding to requests */
#define MC_SERVER_DELETED 2 /* Server is not used anymore */
int Ns_ModuleVersion = 1;
typedef struct mc_conn_t
{
struct mc_conn_t *next;
int sock;
Ns_DString ds;
struct mc_server_t *ms;
} mc_conn_t;
typedef struct mc_server_t
{
char *host; /* Hostname of this server */
int port; /* Port of this server */
int status; /* Server status */
int timeout;
mc_conn_t *conns; /* List of actual client connections */
Ns_Mutex lock;
time_t deadtime;
} mc_server_t;
typedef struct mc_t
{
uint16_t nalloc; /* Number of servers allocated */
uint16_t ntotal; /* Number of servers added */
mc_server_t **servers; /* Array of servers */
Ns_RWLock lock;
} mc_t;
static uint32_t mc_hash(const char* data, uint32_t data_len);
static mc_t *mc_create(uint16_t max_servers, uint32_t flags);
static mc_server_t *mc_server_create(char *host, int port, uint32_t timeout);
static mc_server_t * mc_server_find(mc_t *mc, char* host, int port);
static int mc_server_add(mc_t *mc, mc_server_t *ms);
static void mc_server_delete(mc_t *mc, mc_server_t *ms);
static int mc_get(mc_t *mc, char* key, char **data, size_t *length, uint16_t *flags);
static int mc_set(mc_t *mc, char* cmd, char* key, char *data, uint32_t data_size, uint32_t timeout, uint16_t flags);
static int mc_areplace(mc_t *mc, char* key, char *data, uint32_t data_size, uint32_t timeout, uint16_t flags,
char **data2, size_t *length2, uint16_t *flags2);
static int mc_delete(mc_t *mc, char* key);
static int mc_incr(mc_t *mc, char *cmd, char* key, int32_t n, uint32_t *new_value);
static int mc_version(mc_t *mc, mc_server_t *ms, char **data);
static int MCInterpInit(Tcl_Interp * interp, void *arg);
static int MCCmd(ClientData arg, Tcl_Interp * interp, int objc, Tcl_Obj * CONST objv[]);
/* The crc32 functions and data was originally written by Spencer
* Garrett <[email protected]> and was cleaned from the PostgreSQL source
* tree via the files contrib/ltree/crc32.[ch]. No license was
* included, therefore it is assumed that this code is public
* domain. */
static const uint32_t crc32tab[256] = {
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};
NS_EXPORT int Ns_ModuleInit(char *server, char *module)
{
int i;
char *key, *path;
mc_t *mc;
Ns_Set *set;
mc = mc_create(16, 0);
path = Ns_ConfigGetPath(server, module, NULL);
set = Ns_ConfigGetSection(path);
for (i = 0; set != NULL && i < Ns_SetSize(set); ++i) {
key = Ns_SetKey(set, i);
if (!strcasecmp(key, "server")) {
key = Ns_SetValue(set, i);
mc_server_add(mc, mc_server_create(key, 0, 0));
Ns_Log(Notice, "nsmemcache: added %s", key);
}
}
// For AOL 4.0.10
Ns_TclInitInterps(server, MCInterpInit, mc);
// For AOL 4.5 uncomment the following line and comment out the above Ns_TclInitInterps statement
//Ns_TclRegisterTrace(server, MCInterpInit, mc, NS_TCL_TRACE_CREATE);
return NS_OK;
}
static int MCInterpInit(Tcl_Interp * interp, void *arg)
{
Tcl_CreateObjCommand(interp, "ns_memcache", MCCmd, arg, NULL);
return NS_OK;
}
static int MCCmd(ClientData arg, Tcl_Interp * interp, int objc, Tcl_Obj * CONST objv[])
{
mc_t *mc = arg;
mc_server_t *ms;
uint16_t flags = 0;
char *key, *data=NULL;
uint32_t size, expires = 0;
int cmd;
enum {
cmdGet, cmdAdd, cmdAppend, cmdSet, cmdReplace, cmdAReplace, cmdDelete, cmdIncr, cmdDecr, cmdVersion,
cmdServer
};
static CONST char *sCmd[] = {
"get", "add", "append", "set", "replace", "areplace", "delete", "incr", "decr", "version",
"server",
0
};
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "cmd args");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], sCmd, "command", TCL_EXACT, (int *) &cmd) != TCL_OK) {
return TCL_ERROR;
}
switch (cmd) {
case cmdServer:
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "cmd server");
return TCL_ERROR;
}
if (!strcmp(Tcl_GetString(objv[2]), "add")) {
mc_server_add(mc, mc_server_create(Tcl_GetString(objv[3]), 0, 0));
} else
if (!strcmp(Tcl_GetString(objv[2]), "delete")) {
mc_server_delete(mc, mc_server_find(mc, Tcl_GetString(objv[3]), 0));
}
break;
case cmdGet:
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "key dataVar ?lengthVar? ?flagsVar?");
return TCL_ERROR;
}
key = Tcl_GetString(objv[2]);
cmd = mc_get(mc, key, &data, &size, &flags);
if (cmd == 1) {
Tcl_SetVar2Ex(interp, Tcl_GetString(objv[3]), NULL, Tcl_NewByteArrayObj((uint8_t*)data, size), 0);
if (objc > 4) {
Tcl_SetVar2Ex(interp, Tcl_GetString(objv[4]), NULL, Tcl_NewLongObj(size), 0);
}
if (objc > 5) {
Tcl_SetVar2Ex(interp, Tcl_GetString(objv[5]), NULL, Tcl_NewIntObj(flags), 0);
}
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(cmd));
ns_free(data);
break;
case cmdAdd:
case cmdSet:
case cmdAppend:
case cmdReplace:
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "key value ?expires? ?flags?");
return TCL_ERROR;
}
key = Tcl_GetString(objv[2]);
data = (char*)Tcl_GetByteArrayFromObj(objv[3], (int*)&size);
if (objc > 4) {
expires = atoi(Tcl_GetString(objv[4]));
}
if (objc > 5) {
flags = atoi(Tcl_GetString(objv[5]));
}
switch (cmd) {
case cmdAdd:
cmd = mc_set(mc, "add", key, data, size, expires, flags);
break;
case cmdAppend:
cmd = mc_set(mc, "append", key, data, size, expires, flags);
break;
case cmdSet:
cmd = mc_set(mc, "set", key, data, size, expires, flags);
break;
case cmdReplace:
cmd = mc_set(mc, "replace", key, data, size, expires, flags);
break;
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(cmd));
break;
case cmdAReplace: {
char *data2=NULL, *outVar = NULL, *outSize = NULL, *outFlags = NULL;
u_int32_t size2 = 0;
u_int16_t flags2 = 0;
Ns_ObjvSpec opts[] = {
{"-expires", Ns_ObjvInt, &expires, NULL},
{"-flags", Ns_ObjvInt, &flags, NULL},
{"-outsize", Ns_ObjvString, &outSize, NULL},
{"-outflags", Ns_ObjvString, &outFlags, NULL},
{"-outvar", Ns_ObjvString, &outVar, NULL},
{"--", Ns_ObjvBreak, NULL, NULL},
{NULL, NULL, NULL, NULL}
};
Ns_ObjvSpec args[] = {
{"key", Ns_ObjvString, &key, NULL},
{"value", Ns_ObjvString, &data, &size},
{NULL, NULL, NULL, NULL}
};
if (Ns_ParseObjv(opts, args, interp, 2, objc, objv) != NS_OK) {
return TCL_ERROR;
}
cmd = mc_areplace(mc, key, data, size, expires, flags, &data2, &size2, &flags2);
if (cmd == 1) {
if (outVar != NULL) {
Tcl_SetVar2Ex(interp, outVar, NULL, Tcl_NewByteArrayObj((uint8_t*)data2, size2), 0);
}
if (outSize != NULL) {
Tcl_SetVar2Ex(interp, outSize, NULL, Tcl_NewLongObj(size2), 0);
}
if (outFlags != NULL) {
Tcl_SetVar2Ex(interp, outFlags, NULL, Tcl_NewIntObj(flags2), 0);
}
}
ns_free(data2);
Tcl_SetObjResult(interp, Tcl_NewIntObj(cmd));
break;
}
case cmdDelete:
if (objc < 3) {
Tcl_WrongNumArgs(interp, 2, objv, "key ?expires?");
return TCL_ERROR;
}
key = Tcl_GetString(objv[2]);
if (objc > 3) {
expires = atoi(Tcl_GetString(objv[3]));
}
cmd = mc_delete(mc, key);
Tcl_SetObjResult(interp, Tcl_NewIntObj(cmd));
break;
case cmdIncr:
case cmdDecr:
if (objc < 4) {
Tcl_WrongNumArgs(interp, 2, objv, "key value ?varname?");
return TCL_ERROR;
}
key = Tcl_GetString(objv[2]);
size = atoi(Tcl_GetString(objv[3]));
switch (cmd) {
case cmdIncr:
cmd = mc_incr(mc, "incr", key, size, &size);
break;
case cmdDecr:
cmd = mc_incr(mc, "decr", key, size, &size);
break;
}
if (cmd == 1 && objc > 4) {
Tcl_SetVar2Ex(interp, Tcl_GetString(objv[4]), NULL, Tcl_NewLongObj(size), 0);
}
Tcl_SetObjResult(interp, Tcl_NewIntObj(cmd));
break;
case cmdVersion:
if (mc->ntotal == 0) {
break;
}
ms = mc->servers[0];
if (objc > 2) {
ms = mc_server_find(mc, Tcl_GetString(objv[2]), PORT);
}
if (ms != NULL) {
data = NULL;
mc_version(mc, ms, &data);
if (data != NULL) {
Tcl_SetObjResult(interp, Tcl_NewStringObj(data, -1));
ns_free(data);
}
}
break;
}
return TCL_OK;
}
static uint32_t mc_hash(const char* data, const uint32_t data_len)
{
uint32_t i;
uint32_t crc;
crc = ~0;
for (i = 0; i < data_len; i++)
crc = (crc >> 8) ^ crc32tab[(crc ^ (data[i])) & 0xff];
return ((~crc >> 16) & 0x7fff);
}
static mc_conn_t *mc_conn_create(mc_server_t *ms)
{
int sock;
mc_conn_t *conn;
int timeout = TIMEOUT;
sock = Ns_SockTimedConnect((char*)ms->host, ms->port, timeout);
if (sock == -1) {
Ns_Log(Error, "nsmemcache: unable to connect to %s:%d", ms->host, ms->port);
return NULL;
}
Ns_SockSetNonBlocking(sock);
conn = ns_malloc(sizeof(mc_conn_t));
Ns_DStringInit(&conn->ds);
conn->sock = sock;
conn->ms = ms;
return conn;
}
static void mc_conn_free(mc_conn_t *conn)
{
if (conn != NULL) {
close(conn->sock);
Ns_DStringFree(&conn->ds);
ns_free(conn);
}
}
static mc_conn_t *mc_conn_get(mc_server_t * ms)
{
mc_conn_t *conn;
Ns_MutexLock(&ms->lock);
conn = ms->conns;
if (ms->conns) {
ms->conns = ms->conns->next;
}
Ns_MutexUnlock(&ms->lock);
if (conn == NULL) {
return mc_conn_create(ms);
}
Ns_DStringSetLength(&conn->ds, 0);
return conn;
}
static void mc_conn_put(mc_conn_t * conn)
{
mc_server_t *ms = conn->ms;
Ns_MutexLock(&ms->lock);
conn->next = ms->conns;
ms->conns = conn;
Ns_MutexUnlock(&ms->lock);
}
static int mc_conn_read(mc_conn_t * conn, int len, int reset, char **line)
{
int nread, n, i;
int timeout = conn->ms->timeout;
if (reset) {
Ns_DStringSetLength(&conn->ds, 0);
}
nread = conn->ds.length;
Ns_DStringSetLength(&conn->ds, nread + len);
while (len > 0) {
n = Ns_SockRecv(conn->sock, conn->ds.string + nread, len, timeout);
if (n <= 0) {
break;
}
// Store pointer of the second line which is data in case of get command
if (line) {
for (i = nread; i < n; i++) {
if (conn->ds.string[nread + i] == '\n') {
*line = &conn->ds.string[nread + i + 1];
len = 0;
break;
}
}
}
nread += n;
len -= n;
}
Ns_DStringSetLength(&conn->ds, nread);
return nread;
}
static mc_server_t *mc_server_create(char* host, int port, uint32_t timeout)
{
mc_server_t *server = ns_calloc(1, sizeof(mc_server_t));
server->host = ns_strdup(host);
server->port = port ? port : PORT;
server->timeout = timeout ? timeout : TIMEOUT;
server->status = MC_SERVER_LIVE;
return server;
}
static void mc_server_dead(mc_t * mc, mc_server_t * ms)
{
Ns_MutexLock(&ms->lock);
ms->status = MC_SERVER_DEAD;
ms->deadtime = time(0);
Ns_MutexUnlock(&ms->lock);
Ns_Log(Notice, "nsmemcache: server %s:%d is dead", ms->host, ms->port);
}
static int mc_server_add(mc_t *mc, mc_server_t *ms)
{
if (ms == NULL) {
return -1;
}
Ns_RWLockWrLock(&mc->lock);
if (mc->ntotal >= mc->nalloc) {
mc->nalloc += 8;
mc->servers = ns_realloc(mc->servers, mc->nalloc);
}
mc->servers[mc->ntotal++] = ms;
Ns_RWLockUnlock(&mc->lock);
return 0;
}
static void mc_server_delete(mc_t *mc, mc_server_t *ms)
{
int i;
mc_conn_t *next;
if (ms == NULL) {
return;
}
Ns_RWLockWrLock(&mc->lock);
for (i = 0; i < mc->ntotal; i++) {
if (mc->servers[i] == ms) {
Ns_MutexLock(&ms->lock);
ms->status = MC_SERVER_DELETED;
while (ms->conns) {
next = ms->conns->next;
mc_conn_free(ms->conns);
ms->conns = next;
}
Ns_MutexUnlock(&ms->lock);
break;
}
}
Ns_RWLockUnlock(&mc->lock);
}
static mc_server_t * mc_server_find_hash(mc_t *mc, const uint32_t hash)
{
mc_server_t *ms, *srv = NULL;
uint32_t h = hash, i = 0;
time_t now = time(0);
int rc;
Ns_RWLockRdLock(&mc->lock);
while (srv == NULL && i < mc->ntotal) {
ms = mc->servers[h % mc->ntotal];
Ns_MutexLock(&ms->lock);
switch (ms->status) {
case MC_SERVER_LIVE:
srv = ms;
break;
case MC_SERVER_DEAD:
/* Try the the dead server */
if (now - ms->deadtime > DEADTIME) {
Ns_MutexUnlock(&ms->lock);
rc = mc_version(mc, ms, NULL);
Ns_MutexLock(&ms->lock);
if (rc == 1) {
ms->status = MC_SERVER_LIVE;
srv = ms;
break;
}
}
break;
}
Ns_MutexUnlock(&ms->lock);
h++;
i++;
}
Ns_RWLockUnlock(&mc->lock);
if (srv == NULL) {
Ns_Log(Error, "nsmemcache: no servers found");
}
return srv;
}
static mc_server_t * mc_server_find(mc_t *mc, char* host, int port)
{
int i;
mc_server_t *ms = NULL;
Ns_RWLockRdLock(&mc->lock);
for (i = 0; i < mc->ntotal; i++) {
if (strcmp(mc->servers[i]->host, host) == 0
&& mc->servers[i]->port == port) {
ms = mc->servers[i];
break;
}
}
Ns_RWLockUnlock(&mc->lock);
return ms;
}
static mc_t *mc_create(uint16_t max_servers, uint32_t flags)
{
mc_t *mc = ns_calloc(1, sizeof(mc_t));
mc->nalloc = max_servers;
mc->ntotal = 0;
mc->servers = ns_calloc(mc->nalloc, sizeof(struct mc_server_t *));
return mc;
}
static int mc_set(mc_t *mc, char* cmd, char* key, char *data, uint32_t data_size, uint32_t timeout, uint16_t flags)
{
int rc;
char *line;
uint32_t hash;
mc_server_t* ms;
mc_conn_t* conn;
struct iovec vec[3];
hash = mc_hash(key, strlen(key));
ms = mc_server_find_hash(mc, hash);
if (ms == NULL) {
return -1;
}
conn = mc_conn_get(ms);
if (conn == NULL) {
mc_server_dead(mc, ms);
return -1;
}
/* <command name> <key> <flags> <exptime> <bytes>\r\n<data>\r\n */
Ns_DStringPrintf(&conn->ds, "%s %s %u %u %u\r\n", cmd, key, flags, timeout, data_size);
vec[0].iov_base = conn->ds.string;
vec[0].iov_len = conn->ds.length;
vec[1].iov_base = data;
vec[1].iov_len = data_size;
vec[2].iov_base = "\r\n";
vec[2].iov_len = 2;
rc = Ns_SockSendBufs(conn->sock, vec, 3, ms->timeout,0);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
rc = mc_conn_read(conn, BUFSIZE, 1, &line);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
if (strcmp(conn->ds.string, "STORED\r\n") == 0) {
mc_conn_put(conn);
return 1;
}
if (strcmp(conn->ds.string, "NOT_STORED\r\n") == 0) {
mc_conn_put(conn);
return 0;
}
Ns_Log(Error, "nsmemcache: unknown response from %s:%d: %s", ms->host, ms->port, conn->ds.string);
mc_conn_put(conn);
return -1;
}
static int mc_get(mc_t *mc, char* key, char **data, size_t *length, uint16_t *flags)
{
int rc;
uint32_t hash;
mc_server_t* ms;
mc_conn_t* conn;
char *line = NULL;
char *ptr;
size_t offset, total, len = 0;
hash = mc_hash(key, strlen(key));
ms = mc_server_find_hash(mc, hash);
if (ms == NULL) {
return -1;
}
conn = mc_conn_get(ms);
if (conn == NULL) {
mc_server_dead(mc, ms);
return -1;
}
/* get <key>[ <key>[...]]\r\n */
Ns_DStringPrintf(&conn->ds, "get %s\r\n", key);
rc = Ns_SockSend(conn->sock, conn->ds.string, conn->ds.length, ms->timeout);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
/* VALUE <key> <flags> <bytes> [cas unique]\r\n<data block>\r\nEND\r\n */
rc = mc_conn_read(conn, BUFSIZE, 1, &line);
if (rc <= 0 || line == NULL) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
if (strncmp(conn->ds.string, "VALUE ", 6) == 0) {
// Seek to key
ptr = Ns_NextWord(conn->ds.string);
// Seek to flags
ptr = Ns_NextWord(ptr);
if (flags) {
*flags = atoi(ptr);
}
// Seek to bytes
ptr = Ns_NextWord(ptr);
len = atoi(ptr);
if (length) {
*length = len;
}
if (len < 0) {
mc_conn_put(conn);
return -1;
}
offset = line - conn->ds.string;
// Calculate total response buffer size: header + data + footer
total = offset + len + 7;
if (rc < total) {
rc = mc_conn_read(conn, total - rc, 0, 0);
}
if (rc < total) {
mc_conn_free(conn);
return -1;
}
*data = ns_malloc(len + 1);
strncpy(*data, &conn->ds.string[offset], len);
mc_conn_put(conn);
return 1;
}
if (strncmp(conn->ds.string, "END\r\n", 5) == 0) {
mc_conn_put(conn);
return 0;
}
Ns_Log(Error, "nsmemcache: unknown response from %s:%d: %s", ms->host, ms->port, conn->ds.string);
mc_conn_put(conn);
return -1;
}
static int mc_delete(mc_t *mc, char* key)
{
int rc;
char *line;
mc_server_t* ms;
mc_conn_t* conn;
uint32_t hash;
hash = mc_hash(key, strlen(key));
ms = mc_server_find_hash(mc, hash);
if (ms == NULL) {
return -1;
}
conn = mc_conn_get(ms);
if (conn == NULL) {
mc_server_dead(mc, ms);
return -1;
}
/* delete <key> <time>\r\n */
Ns_DStringPrintf(&conn->ds, "delete %s \r\n", key);
rc = Ns_SockSend(conn->sock, conn->ds.string, conn->ds.length, ms->timeout);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
rc = mc_conn_read(conn, BUFSIZE, 1, &line);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
if (strcmp(conn->ds.string, "DELETED\r\n") == 0) {
mc_conn_put(conn);
return 1;
}
if (strcmp(conn->ds.string, "NOT_FOUND\r\n") == 0) {
mc_conn_put(conn);
return 0;
}
Ns_Log(Error, "nsmemcache: unknown response from %s:%d: %s", ms->host, ms->port, conn->ds.string);
mc_conn_put(conn);
return -1;
}
static int mc_incr(mc_t *mc, char* cmd, char* key, const int32_t inc, uint32_t *new_value)
{
int rc;
char *line;
mc_server_t* ms;
mc_conn_t* conn;
uint32_t hash;
hash = mc_hash(key, strlen(key));
ms = mc_server_find_hash(mc, hash);
if (ms == NULL) {
return -1;
}
conn = mc_conn_get(ms);
if (conn == NULL) {
mc_server_dead(mc, ms);
return -1;
}
/* <cmd> <key> <value>\r\n */
Ns_DStringPrintf(&conn->ds, "%s %s %u\r\n", cmd, key, inc);
rc = Ns_SockSend(conn->sock, conn->ds.string, conn->ds.length, ms->timeout);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
/* <value>\r\n */
rc = mc_conn_read(conn, BUFSIZE, 1, &line);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
if (strcmp(conn->ds.string, "ERROR\r\n") == 0) {
mc_conn_put(conn);
return -1;
}
if (strcmp(conn->ds.string, "NOT_FOUND\r\n") == 0) {
mc_conn_put(conn);
return 0;
}
if (new_value) {
*new_value = atoi(conn->ds.string);
}
mc_conn_put(conn);
return 1;
}
static int mc_version(mc_t *mc, mc_server_t *ms, char **data)
{
int rc;
char *line;
mc_conn_t* conn;
conn = mc_conn_get(ms);
if (conn == NULL) {
mc_server_dead(mc, ms);
return -1;
}
/* version\r\n */
Ns_DStringPrintf(&conn->ds, "version\r\n");
rc = Ns_SockSend(conn->sock, conn->ds.string, conn->ds.length, ms->timeout);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
/* VERSION <version>\r\n */
rc = mc_conn_read(conn, BUFSIZE, 1, &line);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
if (strncmp(conn->ds.string, "VERSION ", 8) == 0) {
if (data) {
*data = ns_strdup(Ns_StrTrimRight(conn->ds.string+8));
}
rc = 1;
} else {
rc = 0;
}
mc_conn_put(conn);
return rc;
}
static int mc_areplace(mc_t *mc, char* key, char *data, uint32_t data_size, uint32_t timeout, uint16_t flags, char **data2, size_t *length2, uint16_t *flags2)
{
int rc, len;
uint32_t hash;
char *line, *ptr;
mc_server_t* ms;
mc_conn_t* conn;
struct iovec vec[3];
size_t offset;
hash = mc_hash(key, strlen(key));
ms = mc_server_find_hash(mc, hash);
if (ms == NULL) {
return -1;
}
conn = mc_conn_get(ms);
if (conn == NULL) {
mc_server_dead(mc, ms);
return -1;
}
/* areplace <key> <flags> <exptime> <bytes>\r\n<data>\r\n */
Ns_DStringPrintf(&conn->ds, "areplace %s %u %u %u\r\n", key, flags, timeout, data_size);
vec[0].iov_base = conn->ds.string;
vec[0].iov_len = conn->ds.length;
vec[1].iov_base = data;
vec[1].iov_len = data_size;
vec[2].iov_base = "\r\n";
vec[2].iov_len = 2;
rc = Ns_SockSendBufs(conn->sock, vec, 3, ms->timeout,0);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
rc = mc_conn_read(conn, BUFSIZE, 1, &line);
if (rc <= 0) {
mc_conn_free(conn);
mc_server_dead(mc, ms);
return -1;
}
if (strcmp(conn->ds.string, "NOT_STORED\r\n") == 0) {
mc_conn_put(conn);
return 0;
}
if (strncmp(conn->ds.string, "VALUE ", 6) == 0) {
ptr = ns_strtok(conn->ds.string," ");
ptr = ns_strtok(NULL," ");
ptr = ns_strtok(NULL," ");
if (flags2) {
*flags2 = atoi(ptr);
}
ptr = ns_strtok(NULL," ");
if (ptr) {
len = atoi(ptr);
}
if (len < 0) {
mc_conn_put(conn);
return -1;
}
if (length2) {
*length2 = len;
}
if (*line) {
offset = line - conn->ds.string;
memmove(conn->ds.string, &conn->ds.string[offset], rc - offset);
Ns_DStringSetLength(&conn->ds, rc - offset);