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/*
* Copyright 2017 The Android Open Source Project
*
* 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 <list>
#include <unordered_map>
#include <unordered_set>
#include "bta_gatt_server_queue.h"
using gatts_operation = BtaGattServerQueue::gatts_operation;
using bluetooth::Uuid;
constexpr uint8_t GATT_NOTIFY = 1;
std::unordered_map<uint16_t, std::list<gatts_operation>>
BtaGattServerQueue::gatts_op_queue;
std::unordered_set<uint16_t> BtaGattServerQueue::gatts_op_queue_executing;
std::unordered_map<uint16_t, bool> BtaGattServerQueue::congestion_queue;
void BtaGattServerQueue::mark_as_not_executing(uint16_t conn_id) {
gatts_op_queue_executing.erase(conn_id);
}
void BtaGattServerQueue::gatts_execute_next_op(uint16_t conn_id) {
APPL_TRACE_DEBUG("%s: conn_id=0x%x", __func__, conn_id);
if (gatts_op_queue.empty()) {
APPL_TRACE_DEBUG("%s: op queue is empty", __func__);
return;
}
auto ptr = congestion_queue.find(conn_id);
if (ptr != congestion_queue.end()) {
bool is_congested = ptr->second;
APPL_TRACE_DEBUG(
"%s: congestion queue exist, conn_id: %d, is_congested: %d", __func__,
conn_id, is_congested);
if (is_congested) {
APPL_TRACE_DEBUG("%s: lower layer is congested", __func__);
return;
}
}
auto map_ptr = gatts_op_queue.find(conn_id);
if (map_ptr == gatts_op_queue.end()) {
APPL_TRACE_DEBUG("%s: Queue is null", __func__);
return;
}
if (map_ptr->second.empty()) {
APPL_TRACE_DEBUG("%s: queue is empty for conn_id: %d", __func__, conn_id);
return;
}
if (gatts_op_queue_executing.count(conn_id)) {
APPL_TRACE_DEBUG("%s: can't enqueue next op, already executing", __func__);
return;
}
gatts_operation op = map_ptr->second.front();
APPL_TRACE_DEBUG("%s: op.type=%d, attr_id=%d", __func__, op.type, op.attr_id);
if (op.type == GATT_NOTIFY) {
BTA_GATTS_HandleValueIndication(conn_id, op.attr_id, op.value,
op.need_confirm);
gatts_op_queue_executing.insert(conn_id);
}
}
void BtaGattServerQueue::Clean(uint16_t conn_id) {
APPL_TRACE_DEBUG("%s: conn_id=0x%x", __func__, conn_id);
gatts_op_queue.erase(conn_id);
gatts_op_queue_executing.erase(conn_id);
}
void BtaGattServerQueue::SendNotification(uint16_t conn_id, uint16_t handle,
std::vector<uint8_t> value,
bool need_confirm) {
gatts_op_queue[conn_id].emplace_back(
gatts_operation{.type = GATT_NOTIFY,
.attr_id = handle,
.value = value,
.need_confirm = need_confirm});
gatts_execute_next_op(conn_id);
}
void BtaGattServerQueue::NotificationCallback(uint16_t conn_id) {
auto map_ptr = gatts_op_queue.find(conn_id);
if (map_ptr == gatts_op_queue.end() || map_ptr->second.empty()) {
APPL_TRACE_DEBUG("%s: no more operations queued for conn_id %d", __func__,
conn_id);
return;
}
gatts_operation op = map_ptr->second.front();
map_ptr->second.pop_front();
mark_as_not_executing(conn_id);
gatts_execute_next_op(conn_id);
}
void BtaGattServerQueue::CongestionCallback(uint16_t conn_id, bool congested) {
APPL_TRACE_DEBUG("%s: conn_id: %d, congested: %d", __func__, conn_id,
congested);
congestion_queue[conn_id] = congested;
if (!congested) {
gatts_execute_next_op(conn_id);
}
}
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