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/*
* Copyright (C) 2020 MERA
*
* 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 "ClientManager.h"
#include "CloudType.h"
#include <set>
#include <json-c/json.h>
#include <afb/afb-binding.h> // for AFB_* logger
// static
void ClientManager::cbRemoveClientCtx(void *data)
{
ClientManager::instance().removeClient((ClientManager::ClientCtx*)data);
}
// static
ClientManager& ClientManager::instance()
{
static ClientManager instance;
return instance;
}
ClientManager::~ClientManager()
{
std::lock_guard<std::mutex> lock(this->m_mutex);
for (auto cl : m_clients)
delete cl.second;
}
ClientManager::ClientCtx* ClientManager::addClient(afb_req_t req, const std::string& appid)
{
ClientCtx* ctx = (ClientCtx*)afb_req_context_get(req);
if (!ctx)
{
AFB_NOTICE("create new session for %s", appid.c_str());
ctx = new ClientCtx{appid, afb_api_make_event(req->api, appid.c_str())};
afb_req_session_set_LOA(req, 1);
afb_req_context_set(req, ctx, cbRemoveClientCtx);
}
m_clients[appid] = ctx;
return ctx;
}
void ClientManager::removeClient(ClientCtx* ctx)
{
if(!ctx)
{
AFB_ERROR("data is nullptr");
return;
}
AFB_NOTICE("remove app %s", ctx->appid.c_str());
std::lock_guard<std::mutex> lock(this->m_mutex);
auto it = m_clients.find(ctx->appid);
if (it != m_clients.end())
{
delete it->second;
m_clients.erase(it);
}
}
bool ClientManager::handleRequest(afb_req_t request, const std::string& verb, const std::string& appid)
{
AFB_NOTICE("handleRequest: verb='%s', appid='%s'", verb.c_str(), appid.c_str());
std::lock_guard<std::mutex> lock(this->m_mutex);
if (appid.empty())
{
AFB_ERROR("appid is empty");
return false;
}
auto client_it = m_clients.find(appid);
if (verb != "subscribe" && client_it == m_clients.end())
{
AFB_NOTICE("client with appid '%s' is not registered", appid.c_str());
return false;
}
if (verb == "subscribe")
{
const char *value = afb_req_value(request, "event");
if(!value)
{
AFB_ERROR("Can't subscribe: event name is not defined");
return false;
}
std::string req_event{value};
AFB_NOTICE("subscribe req: appid '%s', event '%s'", appid.c_str(), req_event.c_str());
if (!isSupportedEvent(req_event))
{
AFB_ERROR("event '%s' is not supported", req_event.c_str());
return false;
}
ClientCtx* ctx = addClient(request, appid);
ctx->subs_events.insert(req_event);
if(!ctx->subscription)
{
if(afb_req_subscribe(request, ctx->event) == 0)
{
ctx->subscription = true;
}
else
{
AFB_ERROR("API error in afb_req_subscribe");
return false;
}
}
return true;
}
else if (verb == "unsubscribe")
{
const char *value = afb_req_value(request, "event");
if(!value)
{
AFB_ERROR("Can't unsubscribe: event name is not defined");
return false;
}
std::string req_event{value};
AFB_NOTICE("unsubscribe req: appid '%s', event '%s'", appid.c_str(), req_event.c_str());
ClientCtx* ctx{client_it->second};
ctx->subs_events.erase(req_event);
if(ctx->subs_events.empty())
{
if (afb_req_unsubscribe(request, ctx->event) != 0)
AFB_ERROR("API error in afb_req_unsubscribe");
ctx->subscription = false;
}
return true;
}
AFB_NOTICE("Unsupported verb '%s'", verb.c_str());
return false;
}
bool ClientManager::isSupportedEvent(const std::string& event)
{
const std::set<std::string> event_list{
"sendMessageConfirmation",
"receivedMessage"
};
return (event_list.end() != event_list.find(event));
}
bool ClientManager::emitReceivedMessage(const std::string& appid, const std::string& cloud_type, const std::string& data)
{
std::lock_guard<std::mutex> lock(this->m_mutex);
auto it = m_clients.find(appid);
if (it == m_clients.end())
{
AFB_WARNING("Client with appid '%s' is not present in list", appid.c_str());
// print app list
for (const auto& i : m_clients)
AFB_DEBUG("Client list: appid '%s' - '%s'", i.first.c_str(), i.second->appid.c_str());
return false;
}
json_object* push_obj = json_object_new_object();
json_object_object_add(push_obj, "type", json_object_new_string("receivedMessage"));
json_object_object_add(push_obj, "cloud_type", json_object_new_string(cloud_type.c_str()));
json_object_object_add(push_obj, "data", json_object_new_string(data.c_str()));
return (0 == afb_event_push(it->second->event, push_obj));
}
bool ClientManager::emitSendMessageConfirmation(const std::string& appid, const std::string& cloud_type, bool result)
{
std::lock_guard<std::mutex> lock(this->m_mutex);
auto it = m_clients.find(appid);
if (it == m_clients.end())
{
AFB_WARNING("Client with appid '%s' is not present in list", appid.c_str());
// print app list
for (const auto& i : m_clients)
AFB_DEBUG("Client list: appid '%s' - '%s'", i.first.c_str(), i.second->appid.c_str());
return false;
}
json_object* push_obj = json_object_new_object();
json_object_object_add(push_obj, "type", json_object_new_string("sendMessageConfirmation"));
json_object_object_add(push_obj, "cloud_type", json_object_new_string(cloud_type.c_str()));
json_object_object_add(push_obj, "result", json_object_new_boolean(result));
return (0 == afb_event_push(it->second->event, push_obj));
}
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