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/* -*- Mode: C; tab-width: 2; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/**
* This file contains an implementation of the callback interface for level 1
* in the protocol library. If you compare the implementation with the one
* in interface_v0.c you will see that this implementation is much easier and
* hides all of the protocol logic and let you focus on the application
* logic. One "problem" with this layer is that it is synchronous, so that
* you will not receive the next command before a answer to the previous
* command is being sent.
*/
#include "config.h"
#include <assert.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/tcp.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <libmemcached/protocol_handler.h>
#include <libmemcached/byteorder.h>
#include "storage.h"
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)
{
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
struct item* 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;
}
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)
{
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
struct item *item= get_item(key, keylen);
struct item *nitem;
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);
}
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) {
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
uint64_t val= initial;
struct item *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);
}
return rval;
}
static protocol_binary_response_status delete_handler(const void *cookie,
const void *key,
uint16_t keylen,
uint64_t cas) {
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
if (cas != 0)
{
struct item *item= get_item(key, keylen);
if (item != NULL)
{
if (item->cas != cas)
{
release_item(item);
return PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
}
release_item(item);
}
}
if (!delete_item(key, keylen))
{
rval= PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
}
return rval;
}
static protocol_binary_response_status flush_handler(const void *cookie,
uint32_t when) {
(void)cookie;
flush(when);
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) {
struct item *item= get_item(key, keylen);
if (item == NULL)
{
return PROTOCOL_BINARY_RESPONSE_KEY_ENOENT;
}
protocol_binary_response_status rc;
rc= response_handler(cookie, key, (uint16_t)keylen,
item->data, (uint32_t)item->size, item->flags,
item->cas);
release_item(item);
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) {
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
uint64_t val= initial;
struct item *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};
memcpy(buffer, key, keylen);
memcpy(item->data, &val, sizeof(val));
put_item(item);
*result= val;
*result_cas= item->cas;
release_item(item);
}
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) {
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
struct item *item= get_item(key, keylen);
struct item *nitem= NULL;
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);
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) {
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
struct item* 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);
}
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) {
(void)cookie;
protocol_binary_response_status rval= PROTOCOL_BINARY_RESPONSE_SUCCESS;
if (cas != 0)
{
struct item* item= get_item(key, keylen);
if (item != NULL && cas != item->cas)
{
/* Invalid CAS value */
release_item(item);
return PROTOCOL_BINARY_RESPONSE_KEY_EEXISTS;
}
}
delete_item(key, keylen);
struct item* 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);
}
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_v1_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
}
};
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