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interface.c
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interface.c
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/** Implementation of memcached protocol.
*
* This is an implementation of v1 of the libmemcachedprotocol interface. This
* file is based off the example implementation of a memcached server in the
* libmemcached source code.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/netdevice.h>
#include <linux/ip.h>
#include <linux/in.h>
#include <linux/delay.h>
#include <asm-generic/errno.h>
#include "libmp/protocol_handler.h"
#include "libmp/byteorder.h"
#include "storage.h"
static DEFINE_MUTEX(storage_lock);
static protocol_binary_response_status add_handler(const void *cookie,
const void *key,
uint16_t keylen,
const void *data,
uint32_t datalen,
uint32_t flags,
uint32_t exptime,
uint64_t *cas)
{
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
item_t* item;
(void)cookie;
mutex_lock(&storage_lock);
item = get_item(key, keylen);
if (item == NULL) {
item= create_item(key, keylen, data, datalen, flags, (time_t)exptime);
if (item == 0) {
rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
} else {
put_item(item);
*cas= item->cas;
release_item(item);
}
} else {
rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
}
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status append_handler(const void *cookie,
const void *key,
uint16_t keylen,
const void* val,
uint32_t vallen,
uint64_t cas,
uint64_t *result_cas)
{
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
item_t *item, *nitem;
mutex_lock(&storage_lock);
(void)cookie;
item= get_item(key, keylen);
if (item == NULL) {
rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
} else if (cas != 0 && cas != item->cas) {
rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
} else if ((nitem= create_item(key, keylen, NULL, item->size + vallen,
item->flags, item->exp)) == NULL) {
release_item(item);
rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
} else {
memcpy(nitem->data, item->data, item->size);
memcpy(((char*)(nitem->data)) + item->size, val, vallen);
release_item(item);
delete_item(key, keylen);
put_item(nitem);
*result_cas= nitem->cas;
release_item(nitem);
}
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status decrement_handler(const void *cookie,
const void *key,
uint16_t keylen,
uint64_t delta,
uint64_t initial,
uint32_t expiration,
uint64_t *result,
uint64_t *result_cas) {
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
uint64_t val= initial;
item_t *item;
(void)cookie;
mutex_lock(&storage_lock);
item = get_item(key, keylen);
if (item != NULL) {
if (delta > *(uint64_t*)item->data)
val= 0;
else
val= *(uint64_t*)item->data - delta;
expiration= (uint32_t)item->exp;
release_item(item);
delete_item(key, keylen);
}
item= create_item(key, keylen, NULL, sizeof(initial), 0, (time_t)expiration);
if (item == 0) {
rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
} else {
memcpy(item->data, &val, sizeof(val));
put_item(item);
*result= val;
*result_cas= item->cas;
release_item(item);
}
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status delete_handler(const void *cookie,
const void *key,
uint16_t keylen,
uint64_t cas) {
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
(void)cookie;
mutex_lock(&storage_lock);
if (cas != 0) {
item_t *item= get_item(key, keylen);
if (item != NULL) {
if (item->cas != cas) {
release_item(item);
mutex_unlock(&storage_lock);
return PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
}
release_item(item);
}
}
if (!delete_item(key, keylen)) {
rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
}
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status flush_handler(const void *cookie,
uint32_t when) {
(void)cookie;
mutex_lock(&storage_lock);
flush(when);
mutex_unlock(&storage_lock);
return PROTOCOL_BINARY_RESPONSE_SUCCESS;
}
static protocol_binary_response_status get_handler(const void *cookie,
const void *key,
uint16_t keylen,
memcached_binary_protocol_get_response_handler response_handler) {
protocol_binary_response_status rc;
item_t *item;
mutex_lock(&storage_lock);
item = get_item(key, keylen);
if (item == NULL) {
mutex_unlock(&storage_lock);
return PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
}
rc= response_handler(cookie, key, (uint16_t)keylen,
item->data, (uint32_t)item->size, item->flags,
item->cas);
release_item(item);
mutex_unlock(&storage_lock);
return rc;
}
static protocol_binary_response_status increment_handler(const void *cookie,
const void *key,
uint16_t keylen,
uint64_t delta,
uint64_t initial,
uint32_t expiration,
uint64_t *result,
uint64_t *result_cas) {
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
uint64_t val= initial;
item_t *item;
(void)cookie;
mutex_lock(&storage_lock);
item = get_item(key, keylen);
if (item != NULL) {
val= (*(uint64_t*)item->data) + delta;
expiration= (uint32_t)item->exp;
release_item(item);
delete_item(key, keylen);
}
item= create_item(key, keylen, NULL, sizeof(initial), 0, (time_t)expiration);
if (item == NULL) {
rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
} else {
char buffer[1024] = {0}; // FIXME: does this need to be so big ~ajc
memcpy(buffer, key, keylen);
memcpy(item->data, &val, sizeof(val));
put_item(item);
*result= val;
*result_cas= item->cas;
release_item(item);
}
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status noop_handler(const void *cookie) {
(void)cookie;
return PROTOCOL_BINARY_RESPONSE_SUCCESS;
}
static protocol_binary_response_status prepend_handler(const void *cookie,
const void *key,
uint16_t keylen,
const void* val,
uint32_t vallen,
uint64_t cas,
uint64_t *result_cas) {
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
item_t *nitem= NULL;
item_t *item;
(void)cookie;
mutex_lock(&storage_lock);
item = get_item(key, keylen);
if (item == NULL) {
rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
} else if (cas != 0 && cas != item->cas) {
rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
} else if ((nitem= create_item(key, keylen, NULL, item->size + vallen,
item->flags, item->exp)) == NULL) {
rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
} else {
memcpy(nitem->data, val, vallen);
memcpy(((char*)(nitem->data)) + vallen, item->data, item->size);
release_item(item);
item= NULL;
delete_item(key, keylen);
put_item(nitem);
*result_cas= nitem->cas;
}
if (item)
release_item(item);
if (nitem)
release_item(nitem);
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status quit_handler(const void *cookie) {
(void)cookie;
return PROTOCOL_BINARY_RESPONSE_SUCCESS;
}
static protocol_binary_response_status replace_handler(const void *cookie,
const void *key,
uint16_t keylen,
const void* data,
uint32_t datalen,
uint32_t flags,
uint32_t exptime,
uint64_t cas,
uint64_t *result_cas) {
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
item_t* item;
mutex_lock(&storage_lock);
(void)cookie;
item= get_item(key, keylen);
if (item == NULL) {
rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
} else if (cas == 0 || cas == item->cas) {
release_item(item);
delete_item(key, keylen);
item= create_item(key, keylen, data, datalen, flags, (time_t)exptime);
if (item == 0) {
rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
} else {
put_item(item);
*result_cas= item->cas;
release_item(item);
}
} else {
rval= PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
release_item(item);
}
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status set_handler(const void *cookie,
const void *key,
uint16_t keylen,
const void* data,
uint32_t datalen,
uint32_t flags,
uint32_t exptime,
uint64_t cas,
uint64_t *result_cas) {
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
item_t* item;
(void)cookie;
mutex_lock(&storage_lock);
if (cas != 0) {
item_t* item= get_item(key, keylen);
if (item != NULL && cas != item->cas) {
/* Invalid CAS value */
release_item(item);
mutex_unlock(&storage_lock);
return PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
}
}
delete_item(key, keylen);
item= create_item(key, keylen, data, datalen, flags, (time_t)exptime);
if (item == 0) {
rval= PROTOCOL_BINARY_RESPONSE_ENOMEM;
} else {
put_item(item);
*result_cas= item->cas;
release_item(item);
}
mutex_unlock(&storage_lock);
return rval;
}
static protocol_binary_response_status stat_handler(const void *cookie,
const void *key,
uint16_t keylen,
memcached_binary_protocol_stat_response_handler response_handler) {
(void)key;
(void)keylen;
/* Just return an empty packet */
return response_handler(cookie, NULL, 0, NULL, 0);
}
static protocol_binary_response_status version_handler(const void *cookie,
memcached_binary_protocol_version_response_handler response_handler) {
const char *version= "0.1.1";
return response_handler(cookie, version, (uint32_t)strlen(version));
}
memcached_binary_protocol_callback_st interface_impl= {
.interface_version= MEMCACHED_PROTOCOL_HANDLER_V1,
.interface.v1= {
.add= add_handler,
.append= append_handler,
.decrement= decrement_handler,
.delete= delete_handler,
.flush= flush_handler,
.get= get_handler,
.increment= increment_handler,
.noop= noop_handler,
.prepend= prepend_handler,
.quit= quit_handler,
.replace= replace_handler,
.set= set_handler,
.stat= stat_handler,
.version= version_handler
}
};