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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_memcache_hpp
#define tuscany_memcache_hpp
/**
* Memcached access functions.
*/
#include "apr.h"
#include "apu.h"
#include "apr_general.h"
#include "apr_strings.h"
#include "apr_hash.h"
#include "apr_memcache.h"
#include "apr_network_io.h"
#include "string.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "../../modules/scheme/eval.hpp"
namespace tuscany {
namespace memcache {
/**
* Represents a memcached context.
*/
class MemCached {
public:
MemCached() : owner(false) {
debug("memcache::memcached");
}
MemCached(const string host, const int port) : owner(true) {
debug(host, "memcache::memcached::host");
debug(port, "memcache::memcached::port");
apr_pool_create(&pool, NULL);
apr_memcache_create(pool, 1, 0, &mc);
addServer(host, port);
}
MemCached(const list<string>& servers) : owner(true) {
debug(servers, "memcache::memcached::servers");
apr_pool_create(&pool, NULL);
apr_memcache_create(pool, (apr_uint16_t)length(servers), 0, &mc);
addServers(servers);
}
MemCached(const MemCached& c) : owner(false), pool(c.pool), mc(c.mc) {
debug("memcache::memcached::copy");
}
~MemCached() {
debug("memcache::~memcached");
if (!owner)
return;
apr_pool_destroy(pool);
}
private:
bool owner;
apr_pool_t* pool;
apr_memcache_t* mc;
friend const failable<bool> post(const value& key, const value& val, const MemCached& cache);
friend const failable<bool> put(const value& key, const value& val, const MemCached& cache);
friend const failable<value> get(const value& key, const MemCached& cache);
friend const failable<bool> del(const value& key, const MemCached& cache);
/**
* Add servers to the memcached context.
*/
const failable<bool> addServer(const string& host, const int port) {
apr_memcache_server_t *server;
const apr_status_t sc = apr_memcache_server_create(pool, c_str(host), (apr_port_t)port, 1, 1, 1, 600, &server);
if (sc != APR_SUCCESS) {
ostringstream os;
os << "Couldn't connect to memcached server: " << host << ":" << port;
return mkfailure<bool>(str(os));
}
const apr_status_t as = apr_memcache_add_server(mc, server);
if (as != APR_SUCCESS)
return mkfailure<bool>("Couldn't add memcached server");
return true;
}
const failable<bool> addServers(const list<string>& servers) {
if (isNil(servers))
return true;
const list<string> toks = tokenize(":", car(servers));
const failable<bool> r = addServer(car(toks), isNil(cdr(toks))? 11211 : atoi(c_str(cadr(toks))));
if (!hasContent(r))
return r;
return addServers(cdr(servers));
}
};
/**
* Replace spaces by tabs (as spaces are not allowed in memcached keys).
*/
const char* nospaces(const char* s) {
char* c = const_cast<char*>(s);
for (; *c; c++)
if (*c == ' ')
*c = '\t';
return s;
}
/**
* Post a new item to the cache.
*/
const failable<bool> post(const value& key, const value& val, const MemCached& cache) {
debug(key, "memcache::post::key");
debug(val, "memcache::post::value");
const string ks(scheme::writeValue(key));
const string vs(scheme::writeValue(val));
const apr_status_t rc = apr_memcache_add(cache.mc, nospaces(c_str(ks)), const_cast<char*>(c_str(vs)), length(vs), 0, 27);
if (rc != APR_SUCCESS) {
ostringstream os;
os << "Couldn't add memcached entry: " << key;
return mkfailure<bool>(str(os));
}
debug(true, "memcache::post::result");
return true;
}
/**
* Update an item in the cache. If the item doesn't exist it is added.
*/
const failable<bool> put(const value& key, const value& val, const MemCached& cache) {
debug(key, "memcache::put::key");
debug(val, "memcache::put::value");
const string ks(scheme::writeValue(key));
const string vs(scheme::writeValue(val));
const apr_status_t rc = apr_memcache_set(cache.mc, nospaces(c_str(ks)), const_cast<char*>(c_str(vs)), length(vs), 0, 27);
if (rc != APR_SUCCESS) {
ostringstream os;
os << "Couldn't set memcached entry: " << key;
return mkfailure<bool>(str(os));
}
debug(true, "memcache::put::result");
return true;
}
/**
* Get an item from the cache.
*/
const failable<value> get(const value& key, const MemCached& cache) {
debug(key, "memcache::get::key");
const string ks(scheme::writeValue(key));
char *data;
apr_size_t size;
const apr_status_t rc = apr_memcache_getp(cache.mc, cache.pool, nospaces(c_str(ks)), &data, &size, NULL);
if (rc != APR_SUCCESS) {
ostringstream os;
os << "Couldn't get memcached entry: " << key;
return mkfailure<value>(str(os), false);
}
const value val(scheme::readValue(string(data, size)));
debug(val, "memcache::get::result");
return val;
}
/**
* Delete an item from the cache
*/
const failable<bool> del(const value& key, const MemCached& cache) {
debug(key, "memcache::delete::key");
const string ks(scheme::writeValue(key));
const apr_status_t rc = apr_memcache_delete(cache.mc, nospaces(c_str(ks)), 0);
if (rc != APR_SUCCESS) {
ostringstream os;
os << "Couldn't delete memcached entry: " << key;
return mkfailure<bool>(str(os));
}
debug(true, "memcache::delete::result");
return true;
}
}
}
#endif /* tuscany_memcache_hpp */
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