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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.
*/
/* $Rev$ $Date$ */
/**
* Memcached-based cache component implementation.
*/
#define WANT_HTTPD_LOG 1
#include "string.hpp"
#include "function.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "memcache.hpp"
namespace tuscany {
namespace cache {
/**
* Get an item from the cache.
*/
const failable<value> get(const list<value>& params, const memcache::MemCached& ch) {
return memcache::get(car(params), ch);
}
/**
* Post an item to the cache.
*/
const failable<value> post(const list<value>& params, const memcache::MemCached& ch) {
const value id = append<value>(car(params), mklist(mkuuid()));
const failable<bool> val = memcache::post(id, cadr(params), ch);
if (!hasContent(val))
return mkfailure<value>(val);
return id;
}
/**
* Put an item into the cache.
*/
const failable<value> put(const list<value>& params, const memcache::MemCached& ch) {
const failable<bool> val = memcache::put(car(params), cadr(params), ch);
if (!hasContent(val))
return mkfailure<value>(val);
return value(content(val));
}
/**
* Patch an item in the cache.
*/
const failable<value> patch(const list<value>& params, const memcache::MemCached& ch) {
// Read patch
value p = assoc<value>("patch", assoc<value>("content", car<value>(cadr(params))));
if (isNull(p))
return mkfailure<value>("Couldn't read patch script");
const string script = cadr<value>(p);
debug(script, "memcache::patch::script");
istringstream is(script);
// Get existing value from cache
const failable<value> ival = memcache::get(car(params), ch);
if (!hasContent(ival) && rcode(ival) != 404)
return mkfailure<value>(ival);
// Apply patch
scheme::Env env = scheme::setupEnvironment();
const value pval = scheme::evalScript(cons<value>("patch", scheme::quotedParameters(mklist<value>(car(params), hasContent(ival)? content(ival) : (value)list<value>()))), is, env);
if (isNull(pval)) {
ostringstream os;
os << "Couldn't patch memcached entry: " << car(params);
return mkfailure<value>(str(os), 404, false);
}
// Push patched value to cache
const failable<bool> val = memcache::patch(car(params), pval, ch);
if (!hasContent(val))
return mkfailure<value>(val);
return value(content(val));
}
/**
* Delete an item from the cache.
*/
const failable<value> del(const list<value>& params, const memcache::MemCached& ch) {
const failable<bool> val = memcache::del(car(params), ch);
if (!hasContent(val))
return mkfailure<value>(val);
return value(content(val));
}
/**
* Convert a list of properties to a list of server addresses.
*/
const list<string> servers(const list<value>& params) {
if (isNull(params))
return list<string>();
const value s = ((lvvlambda)car(params))(nilListValue);
return cons<string>(s, servers(cdr(params)));
}
/**
* Start the component.
*/
const failable<value> start(const list<value>& params) {
// Connect to memcached
const memcache::MemCached& ch = *(new (gc_new<memcache::MemCached>()) memcache::MemCached(servers(params)));
// Return the component implementation lambda function
const lvvlambda applyCache = [ch](const list<value>& params) -> const value {
const value func(car(params));
if (func == "get")
return get(cdr(params), ch);
if (func == "post")
return post(cdr(params), ch);
if (func == "put")
return put(cdr(params), ch);
if (func == "patch")
return patch(cdr(params), ch);
if (func == "delete")
return del(cdr(params), ch);
return mkfailure<value>();
};
return value(applyCache);
}
}
}
extern "C" {
const tuscany::value apply(const tuscany::list<tuscany::value>& params) {
const tuscany::value func(car(params));
if (func == "start")
return tuscany::cache::start(cdr(params));
return tuscany::mkfailure<tuscany::value>();
}
}
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