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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright 2010 NorthScale, Inc.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ep_extension.h"
#include <memcached/extension.h>
#define ITEM_LOCK_TIMEOUT 15 /* 15 seconds */
#define MAX_KEY_LEN 250 /* maximum permissible key length */
static GetlExtension* getExtension(const void* cookie)
{
return reinterpret_cast<GetlExtension*>(const_cast<void *>(cookie));
}
extern "C" {
static const char *ext_get_name(const void *cmd_cookie) {
(void) cmd_cookie;
return "getl";
}
static ENGINE_ERROR_CODE ext_execute(const void *cmd_cookie, const void *cookie,
int argc, mc_extension_token_t *argv,
RESPONSE_HANDLER_T response_handler) {
(void) cmd_cookie;
if (strncmp(argv[0].value, "getl", argv[0].length) == 0) {
return getExtension(cmd_cookie)->executeGetl(argc, argv,
(void *)cookie,
response_handler);
} else {
return getExtension(cmd_cookie)->executeUnl(argc, argv,
(void *)cookie,
response_handler);
}
}
static bool ext_accept(const void *cmd_cookie, void *cookie,
int argc, mc_extension_token_t *argv, size_t *ndata,
char **ptr) {
(void) cmd_cookie;
(void) cookie;
(void) argc;
(void) ndata;
(void) ptr;
// accept both getl (get locked) and unl (unlock)commands
return argc >= 1 && (strncmp(argv[0].value, "getl", argv[0].length) == 0 ||
strncmp(argv[0].value, "unl", argv[0].length) == 0);
}
static void ext_abort(const void *cmd_cookie, const void *cookie) {
(void) cmd_cookie;
(void) cookie;
}
} /* extern C */
GetlExtension::GetlExtension(EventuallyPersistentStore *kvstore,
GET_SERVER_API get_server_api):
backend(kvstore)
{
serverApi = get_server_api();
}
void GetlExtension::initialize()
{
if (serverApi != NULL) {
EXTENSION_ASCII_PROTOCOL_DESCRIPTOR *ptr = this;
get_name = ext_get_name;
accept = ext_accept;
execute = ext_execute;
abort = ext_abort;
cookie = ptr;
serverApi->extension->register_extension(EXTENSION_ASCII_PROTOCOL, ptr);
getLogger()->log(EXTENSION_LOG_INFO, NULL, "Loaded extension: getl\n");
}
}
ENGINE_ERROR_CODE GetlExtension::executeGetl(int argc, mc_extension_token_t *argv,
void *response_cookie,
RESPONSE_HANDLER_T response_handler)
{
uint32_t lockTimeout = ITEM_LOCK_TIMEOUT;
if (argc == 3) {
if (!parseUint32(argv[2].value, &lockTimeout) ||
lockTimeout > (ITEM_LOCK_TIMEOUT * 2)) {
lockTimeout = ITEM_LOCK_TIMEOUT;
}
} else if (argc != 2) {
return response_handler(response_cookie,
sizeof("CLIENT_ERROR\r\n") - 1,
"CLIENT_ERROR\r\n");
}
std::string k(argv[1].value, argv[1].length);
RememberingCallback<GetValue> getCb;
// TODO: Get vbucket ID here.
bool gotLock = backend->getLocked(k, 0, getCb,
serverApi->core->get_current_time(),
lockTimeout, response_cookie);
Item *itm = NULL;
ENGINE_ERROR_CODE ret;
getCb.waitForValue();
ENGINE_ERROR_CODE rv = getCb.val.getStatus();
if (rv == ENGINE_SUCCESS) {
itm = getCb.val.getValue();
std::stringstream strm;
strm << "VALUE " << itm->getKey() << " " << ntohl(itm->getFlags())
<< " " << itm->getNBytes() << " " << itm->getCas() << "\r\n";
std::string strVal = strm.str();
size_t len = strVal.length();
if ((response_handler(response_cookie, static_cast<int>(len),
strVal.c_str()) == ENGINE_SUCCESS) &&
(response_handler(response_cookie, itm->getNBytes(),
itm->getData()) == ENGINE_SUCCESS) &&
(response_handler(response_cookie, 7,
"\r\nEND\r\n") == ENGINE_SUCCESS)) {
ret = ENGINE_SUCCESS;
} else {
ret = ENGINE_DISCONNECT;
}
} else if (rv == ENGINE_EWOULDBLOCK) {
ret = rv;
} else if (!gotLock) {
ret = response_handler(response_cookie,
sizeof("LOCK_ERROR\r\n") - 1, "LOCK_ERROR\r\n");
} else {
ret = response_handler(response_cookie,
sizeof("NOT_FOUND\r\n") - 1, "NOT_FOUND\r\n");
}
if (itm != NULL) {
delete itm;
}
return ret;
}
ENGINE_ERROR_CODE GetlExtension::executeUnl(int argc, mc_extension_token_t *argv,
void *response_cookie,
RESPONSE_HANDLER_T response_handler)
{
uint64_t cas = 0;
// we need a valid cas value
if (argc != 3 || !parseUint64(argv[2].value, &cas)) {
return response_handler(response_cookie,
sizeof("CLIENT_ERROR\r\n") - 1,
"CLIENT_ERROR\r\n");
}
std::string k(argv[1].value, argv[1].length);
RememberingCallback<GetValue> getCb;
ENGINE_ERROR_CODE rv = backend->unlockKey(k, 0, cas, serverApi->core->get_current_time());
if (rv == ENGINE_SUCCESS) {
return response_handler(response_cookie,
sizeof("UNLOCKED\r\n") -1, "UNLOCKED\r\n");
} else if (rv == ENGINE_TMPFAIL) {
return response_handler(response_cookie,
sizeof("UNLOCK_ERROR\r\n") - 1, "UNLOCK_ERROR\r\n");
} else {
return response_handler(response_cookie,
sizeof("NOT_FOUND\r\n") - 1, "NOT_FOUND\r\n");
}
}
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