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/*
* Copyright (C) 2019 Konsulko Group
*
* 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 "afbclient.h"
#include <string>
#include <cstring>
#include <iostream>
#include <mutex>
#include <condition_variable>
#undef DEBUG
//#define DEBUG
struct call_data
{
bool sync;
std::mutex mutex;
std::condition_variable cv;
bool ready;
std::function<void(json_object*)> cb;
json_object *resp;
};
static void on_hangup_cb(void *closure, struct afb_wsj1 *wsj)
{
}
static void on_call_cb(void *closure, const char *api, const char *verb, struct afb_wsj1_msg *msg)
{
}
static void on_reply_cb(void *closure, struct afb_wsj1_msg *msg)
{
call_data *data = (call_data*) closure;
struct json_object* reply;
if(!data)
goto reply_done;
reply = afb_wsj1_msg_object_j(msg);
if(reply) {
#ifdef DEBUG
std::cerr << __FUNCTION__ << ": reply = " << \
json_object_to_json_string_ext(reply, JSON_C_TO_STRING_SPACED | JSON_C_TO_STRING_PRETTY) << \
std::endl;
#endif
if(data->sync) {
data->resp = reply;
// Increase reference count since we are going to use
// reply after this callback returns, caller must do a
// put.
json_object_get(reply);
} else if(data->cb != nullptr) {
data->cb(reply);
}
}
reply_done:
if(data->sync) {
// Signal reply is done
{
std::lock_guard<std::mutex> lk(data->mutex);
data->ready = true;
}
data->cv.notify_one();
}
}
//
// on_event_cb is inline in afbclient.h
//
static void *afb_loop_thread(struct sd_event* loop)
{
for(;;)
sd_event_run(loop, 30000000);
}
AfbClient::AfbClient(const int port, const std::string &token)
{
std::string uri;
if(sd_event_new(&m_afb_loop) < 0) {
std::cerr << __FUNCTION__ << ": Failed to create event loop" << std::endl;
return;
}
// Initialize interface for websocket
m_itf.on_hangup = on_hangup_cb;
m_itf.on_call = on_call_cb;
m_itf.on_event = on_event_cb;
uri = "ws://localhost:" + std::to_string(port) + "/api?token=" + token;
#ifdef DEBUG
std::cerr << "Using URI: " << uri << std::endl;
#endif
m_ws = afb_ws_client_connect_wsj1(m_afb_loop, uri.c_str(), &m_itf, this);
if(m_ws) {
m_afb_thread = std::thread(afb_loop_thread, m_afb_loop);
} else {
std::cerr << __FUNCTION__ << ": Failed to create websocket connection" << std::endl;
goto error;
}
m_valid = true;
return;
error:
if(m_afb_loop) {
sd_event_unref(m_afb_loop);
m_afb_loop = nullptr;
}
return;
}
AfbClient::~AfbClient(void)
{
sd_event_unref(m_afb_loop);
afb_wsj1_unref(m_ws);
}
int AfbClient::call(const std::string &api, const std::string &verb, struct json_object *arg, callback_fn cb)
{
if(!m_valid)
return -1;
call_data data;
data.sync = false;
data.cb = cb;
int rc = afb_wsj1_call_j(m_ws, api.c_str(), verb.c_str(), arg, on_reply_cb, (void*) &data);
if(rc < 0) {
std::cerr << __FUNCTION__ << \
": Failed to call " << \
api.c_str() << \
"/" << \
verb.c_str() << \
std::endl;
}
return rc;
}
int AfbClient::call_sync(const std::string &api, const std::string &verb, struct json_object *arg, struct json_object **resp)
{
if(!m_valid)
return -1;
call_data data;
data.sync = true;
data.ready = false;
data.cb = nullptr;
int rc = afb_wsj1_call_j(m_ws, api.c_str(), verb.c_str(), arg, on_reply_cb, (void*) &data);
if(rc >= 0) {
// Wait for response
std::unique_lock<std::mutex> lk(data.mutex);
data.cv.wait(lk, [&]{ return data.ready; });
if(resp && data.resp)
*resp = data.resp;
} else {
std::cerr << __FUNCTION__ << \
": Failed to call " << \
api.c_str() << \
"/" << \
verb.c_str() << \
std::endl;
}
return rc;
}
int AfbClient::subscribe(const std::string &api, const std::string &event, const std::string &eventString, callback_fn cb, const std::string &eventValueString)
{
if(!m_valid)
return -1;
// For now, simply let the user over-write the callback if they
// specify the same eventString. Avoiding that and keeping track
// of the duplicate eventStrings/callbacks will complicate things
// quite a bit.
struct json_object *j_obj = json_object_new_object();
json_object_object_add(j_obj, eventValueString.c_str(), json_object_new_string(event.c_str()));
int rc = call_sync(api, std::string("subscribe"), j_obj);
if(rc >= 0 && cb != nullptr) {
m_event_handlers[eventString] = cb;
}
return rc;
}
int AfbClient::unsubscribe(const std::string &api, const std::string &eventString, const std::string &eventValueString)
{
if(!m_valid)
return -1;
if(m_event_handlers.find(eventString) == m_event_handlers.end())
return -1;
struct json_object *j_obj = json_object_new_object();
json_object_object_add(j_obj, eventValueString.c_str(), json_object_new_string(eventString.c_str()));
int rc = call_sync(api, std::string("unsubscribe"), j_obj);
if(rc >= 0) {
m_event_handlers.erase(eventString);
}
return rc;
}
void AfbClient::on_event(const char* event, struct afb_wsj1_msg *msg)
{
#if 0
std::cerr << __FUNCTION__ << ": event = " << event << std::endl;
#endif
struct json_object *contents = afb_wsj1_msg_object_j(msg);
#ifdef DEBUG
std::cerr << __FUNCTION__ << ": contents = " << \
json_object_to_json_string_ext(contents, JSON_C_TO_STRING_SPACED | JSON_C_TO_STRING_PRETTY) << \
std::endl;
#endif
struct json_object *data;
if(json_object_object_get_ex(contents, "data", &data)) {
auto i = m_event_handlers.find(std::string(event));
if (i != m_event_handlers.end() && i->second != nullptr) {
i->second(data);
}
}
}
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