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/*
* Copyright (C) 2018 "IoT.bzh"
* Author Loïc Collignon <loic.collignon@iot.bzh>
*
* 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 <algorithm>
#include "ahl-binding.hpp"
afb_dynapi* AFB_default; // BUG: Is it possible to get rid of this ?
/**
* @brief Callback invoked on new api creation.
* @param[in] handle Handle to the new api.
* @return Status code, zero if success.
*/
int ahl_api_create(void*, struct afb_dynapi* handle)
{
return ahl_binding_t::instance().preinit(handle);
}
/**
* @brief Entry point for dynamic API.
* @param[in] handle Handle to start with for API creation.
* @return Status code, zero if success.
*/
int afbBindingEntry(afb_dynapi* handle)
{
using namespace std::placeholders;
assert(handle != nullptr);
AFB_default = handle;
return afb_dynapi_new_api(
handle,
HL_API_NAME,
HL_API_INFO,
1,
ahl_api_create,
nullptr
);
}
/**
* @brief Callback invoked when API enter the init phase.
* @return Status code, zero if success.
*/
int ahl_api_init(afb_dynapi*)
{
return ahl_binding_t::instance().init();
}
/**
* @brief Callback invoked when an event is received.
* @param[in] e Event's name.
* @param[in] o Event's args.
*/
void ahl_api_on_event(afb_dynapi*, const char* e, struct json_object* o)
{
ahl_binding_t::instance().event(e, o);
}
/**
* @brief Callback invoked when a 'roles' section is found in config file.
* @param[in] o Config section to handle.
* @return Status code, zero if success.
*/
int ahl_api_config_roles(afb_dynapi*, CtlSectionT*, json_object* o)
{
return ahl_binding_t::instance().parse_roles_config(o);
}
/**
* @brief Callback invoked when clients call the verb 'get_roles'.
* @param[in] req Request to handle.
*/
void ahl_api_get_roles(afb_request* req)
{
ahl_binding_t::instance().get_roles(req);
}
/**
* @brief Callback invoked when clients call a 'role' verb.
* @param[in] req Request to handle.
*
* Handle dynamic verbs based on role name ('multimedia', 'navigation', ...)
*/
void ahl_api_role(afb_request* req)
{
role_t* role = (role_t*)req->vcbdata;
assert(role != nullptr);
role->invoke(req);
}
/**
* @brief Default constructor.
*/
ahl_binding_t::ahl_binding_t()
: handle_{nullptr}
{
}
/**
* @brief Get the singleton instance.
* @return The unique instance.
*/
ahl_binding_t& ahl_binding_t::instance()
{
static ahl_binding_t s;
return s;
}
/**
* @brief This method is called during the pre-init phase of loading the binding.
* @param[in] handle Handle to the api.
* @return Status code, zero if success.
*/
int ahl_binding_t::preinit(afb_dynapi* handle)
{
handle_ = handle;
try
{
load_static_verbs();
load_controller_configs();
if (afb_dynapi_on_event(handle_, ahl_api_on_event))
throw std::runtime_error("Failed to register event handler callback.");
if (afb_dynapi_on_init(handle_, ahl_api_init))
throw std::runtime_error("Failed to register init handler callback.");
}
catch(std::exception& e)
{
AFB_DYNAPI_ERROR(handle, "%s", e.what());
return -1;
}
return 0;
}
/**
* @brief Initialize the API.
*/
int ahl_binding_t::init()
{
using namespace std::placeholders;
if (afb_dynapi_require_api(handle_, HAL_MGR_API, 1))
{
AFB_DYNAPI_ERROR(handle_, "Failed to require '%s' API!", HAL_MGR_API);
return -1;
}
AFB_DYNAPI_NOTICE(handle_, "Required '%s' API found!", HAL_MGR_API);
if (afb_dynapi_require_api(handle_, "smixer", 1))
{
AFB_DYNAPI_ERROR(handle_, "Failed to require 'smixer' API!");
return -1;
}
AFB_DYNAPI_NOTICE(handle_, "Required 'smixer' API found!");
afb_dynapi_seal(handle_);
AFB_DYNAPI_NOTICE(handle_, "API is now sealed!");
if (update_streams()) return -1;
return 0;
}
/**
* @brief Update audio roles definition by binding to streams.
* @return Status code, zero if success.
*/
int ahl_binding_t::update_streams()
{
json_object* loaded = nullptr;
json_object* response = nullptr;
size_t hals_count = 0, streams_count = 0;
if (afb_dynapi_call_sync(handle_, "4a-hal-manager", "loaded", json_object_new_object(), &loaded))
{
AFB_DYNAPI_ERROR(handle_, "Failed to call 'loaded' verb on '4a-hal-manager' API!");
if (loaded) AFB_DYNAPI_ERROR(handle_, "%s", json_object_to_json_string(loaded));
return -1;
}
json_bool ret = json_object_object_get_ex(loaded, "response", &response);
if (!ret)
{
AFB_DYNAPI_ERROR(handle_, "Maformed response; missing 'response' field");
return -1;
}
hals_count = json_object_array_length(response);
for(int i = 0; i < hals_count; ++i)
{
json_object* info = nullptr;
const char* halname = json_object_get_string(json_object_array_get_idx(response, i));
AFB_DYNAPI_DEBUG(handle_, "Found an active HAL: %s", halname);
if (afb_dynapi_call_sync(handle_, halname, "info", json_object_new_object(), &info))
{
AFB_DYNAPI_ERROR(handle_, "Failed to call 'info' verb on '%s' API!", halname);
if (info) AFB_DYNAPI_ERROR(handle_, "%s", json_object_to_json_string(info));
return -1;
}
json_object * responseJ = nullptr;
json_object_object_get_ex(info, "response", &responseJ);
json_object* streamsJ = nullptr;
json_object_object_get_ex(responseJ, "streams", &streamsJ);
streams_count = json_object_array_length(streamsJ);
for(int j = 0; j < streams_count; ++j)
{
json_object * nameJ = nullptr, * cardIdJ = nullptr;
json_object * streamJ = json_object_array_get_idx(streamsJ, j);
json_object_object_get_ex(streamJ, "name", &nameJ);
json_object_object_get_ex(streamJ, "cardId", &cardIdJ);
update_stream(
halname,
json_object_get_string(nameJ),
json_object_get_string(cardIdJ)
);
}
json_object_put(info);
}
json_object_put(loaded);
return 0;
}
/**
* @brief Update the stream info for audio roles.
* @param[in] halname The hal on which the stream is.
* @param[in] stream The name of the stream.
* @param[in] deviceid The device ID to return when opening an audio role.
*/
void ahl_binding_t::update_stream(std::string halname, std::string stream, std::string deviceid)
{
for(auto& r : roles_)
{
if(r.stream() == stream)
{
if (r.device_uri().size())
AFB_DYNAPI_WARNING(handle_, "Multiple stream with same name: '%s'.", stream.c_str());
else
{
r.device_uri(deviceid);
r.hal(halname);
}
}
}
}
void ahl_binding_t::event(std::string name, json_object* arg)
{
AFB_DYNAPI_DEBUG(handle_, "Event '%s' received with the following arg: %s", name.c_str(), json_object_to_json_string(arg));
}
void ahl_binding_t::load_static_verbs()
{
if (afb_dynapi_add_verb(
handle_,
"get_roles",
"Retrieve array of available audio roles",
ahl_api_get_roles,
nullptr,
nullptr,
AFB_SESSION_NONE_X2))
{
throw std::runtime_error("Failed to add 'get_role' verb to the API.");
}
}
void ahl_binding_t::load_controller_configs()
{
char* dir_list = getenv("CONTROL_CONFIG_PATH");
if (!dir_list) dir_list = strdup(CONTROL_CONFIG_PATH);
struct json_object* config_files = CtlConfigScan(dir_list, "policy");
if (!config_files) throw std::runtime_error("No config files found!");
// Only one file should be found this way, but read all just in case
size_t config_files_count = json_object_array_length(config_files);
for(int i = 0; i < config_files_count; ++i)
{
config_entry_t file {json_object_array_get_idx(config_files, i)};
if(load_controller_config(file.filepath()) < 0)
{
std::stringstream ss;
ss << "Failed to load config file '"
<< file.filename()
<< "' from '"
<< file.fullpath()
<< "'!";
throw std::runtime_error(ss.str());
}
}
}
int ahl_binding_t::load_controller_config(const std::string& path)
{
CtlConfigT* controller_config;
controller_config = CtlLoadMetaData(handle_, path.c_str());
if (!controller_config)
{
AFB_DYNAPI_ERROR(handle_, "Failed to load controller from config file!");
return -1;
}
static CtlSectionT controller_sections[] =
{
{.key = "plugins", .uid = nullptr, .info = nullptr, .loadCB = PluginConfig, .handle = nullptr, .actions = nullptr},
{.key = "onload", .uid = nullptr, .info = nullptr, .loadCB = OnloadConfig, .handle = nullptr, .actions = nullptr},
{.key = "controls", .uid = nullptr, .info = nullptr, .loadCB = ControlConfig, .handle = nullptr, .actions = nullptr},
{.key = "events", .uid = nullptr, .info = nullptr, .loadCB = EventConfig, .handle = nullptr, .actions = nullptr},
{.key = "roles", .uid = nullptr, .info = nullptr, .loadCB = ahl_api_config_roles, .handle = nullptr, .actions = nullptr },
{.key = nullptr, .uid = nullptr, .info = nullptr, .loadCB = nullptr, .handle = nullptr, .actions = nullptr}
};
CtlLoadSections(handle_, controller_config, controller_sections);
return 0;
}
int ahl_binding_t::parse_roles_config(json_object* o)
{
assert(o != nullptr);
assert(json_object_is_type(o, json_type_array));
if (roles_.size()) return 0; // Roles already added, ignore.
size_t count = json_object_array_length(o);
roles_.reserve(count);
for(int i = 0; i < count; ++i)
{
json_object* jr = json_object_array_get_idx(o, i);
assert(jr != nullptr);
roles_.push_back(role_t(jr));
role_t& r = roles_[roles_.size() - 1];
if(create_api_verb(&r))
return -1;
}
return 0;
}
int ahl_binding_t::create_api_verb(role_t* r)
{
AFB_DYNAPI_NOTICE(handle_, "New audio role: %s", r->uid().c_str());
if (afb_dynapi_add_verb(
handle_,
r->uid().c_str(),
r->description().c_str(),
ahl_api_role,
r,
nullptr,
AFB_SESSION_NONE_X2))
{
AFB_DYNAPI_ERROR(handle_, "Failed to add '%s' verb to the API.",
r->uid().c_str());
return -1;
}
return 0;
}
void ahl_binding_t::get_roles(afb_request* req)
{
json_bool verbose = FALSE;
json_object* arg = afb_request_json(req);
json_object* jverbose;
if (arg != nullptr)
{
json_bool ret = json_object_object_get_ex(arg, "verbose", &jverbose);
if (ret) verbose = json_object_get_boolean(jverbose);
}
json_object* result = json_object_new_array();
for(const auto& r : roles_)
{
if (verbose == TRUE || r.device_uri().size())
json_object_array_add(result, json_object_new_string(r.uid().c_str()));
}
afb_request_success(req, result, nullptr);
}
const std::vector<role_t> ahl_binding_t::roles() const
{
return roles_;
}
afb_dynapi* ahl_binding_t::handle() const
{
return handle_;
}
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