572 lines
16 KiB
C
572 lines
16 KiB
C
/*
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* Copyright (c) 2017, Shane Bryldt
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of the original author; nor the names of any contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "blade.h"
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struct blade_connection_s {
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blade_handle_t *handle;
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ks_pool_t *pool;
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void *transport_data;
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blade_transport_callbacks_t *transport_callbacks;
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blade_connection_direction_t direction;
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volatile blade_connection_state_t state;
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ks_cond_t *cond;
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const char *id;
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ks_rwl_t *lock;
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ks_q_t *sending;
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const char *session;
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};
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void *blade_connection_state_thread(ks_thread_t *thread, void *data);
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ks_status_t blade_connection_state_on_disconnect(blade_connection_t *bc);
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ks_status_t blade_connection_state_on_new(blade_connection_t *bc);
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ks_status_t blade_connection_state_on_connect(blade_connection_t *bc);
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ks_status_t blade_connection_state_on_attach(blade_connection_t *bc);
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ks_status_t blade_connection_state_on_detach(blade_connection_t *bc);
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ks_status_t blade_connection_state_on_ready(blade_connection_t *bc);
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static void blade_connection_cleanup(ks_pool_t *pool, void *ptr, void *arg, ks_pool_cleanup_action_t action, ks_pool_cleanup_type_t type)
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{
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blade_connection_t *bc = (blade_connection_t *)ptr;
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ks_assert(bc);
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switch (action) {
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case KS_MPCL_ANNOUNCE:
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break;
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case KS_MPCL_TEARDOWN:
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blade_connection_shutdown(bc);
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break;
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case KS_MPCL_DESTROY:
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// @todo remove this, it's just for posterity in debugging
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bc->sending = NULL;
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bc->lock = NULL;
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//ks_pool_free(bc->pool, &bc->id);
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bc->id = NULL;
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break;
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}
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}
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KS_DECLARE(ks_status_t) blade_connection_create(blade_connection_t **bcP, blade_handle_t *bh)
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{
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blade_connection_t *bc = NULL;
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ks_pool_t *pool = NULL;
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uuid_t id;
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ks_assert(bcP);
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ks_assert(bh);
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ks_pool_open(&pool);
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ks_assert(pool);
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bc = ks_pool_alloc(pool, sizeof(blade_connection_t));
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bc->handle = bh;
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bc->pool = pool;
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ks_cond_create(&bc->cond, pool);
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ks_assert(bc->cond);
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ks_uuid(&id);
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bc->id = ks_uuid_str(pool, &id);
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ks_assert(bc->id);
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ks_rwl_create(&bc->lock, pool);
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ks_assert(bc->lock);
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ks_q_create(&bc->sending, pool, 0);
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ks_assert(bc->sending);
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ks_pool_set_cleanup(pool, bc, NULL, blade_connection_cleanup);
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ks_log(KS_LOG_DEBUG, "Created\n");
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*bcP = bc;
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return KS_STATUS_SUCCESS;
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}
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KS_DECLARE(ks_status_t) blade_connection_destroy(blade_connection_t **bcP)
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{
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blade_connection_t *bc = NULL;
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ks_pool_t *pool = NULL;
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ks_assert(bcP);
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ks_assert(*bcP);
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bc = *bcP;
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pool = bc->pool;
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//ks_pool_free(bc->pool, bcP);
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ks_pool_close(&pool);
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*bcP = NULL;
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return KS_STATUS_SUCCESS;
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}
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KS_DECLARE(ks_status_t) blade_connection_startup(blade_connection_t *bc, blade_connection_direction_t direction)
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{
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blade_handle_t *bh = NULL;
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ks_assert(bc);
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bh = blade_connection_handle_get(bc);
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bc->direction = direction;
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blade_connection_state_set(bc, BLADE_CONNECTION_STATE_NONE);
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if (ks_thread_pool_add_job(blade_handle_tpool_get(bh), blade_connection_state_thread, bc) != KS_STATUS_SUCCESS) {
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// @todo error logging
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return KS_STATUS_FAIL;
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}
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ks_log(KS_LOG_DEBUG, "Started\n");
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return KS_STATUS_SUCCESS;
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}
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KS_DECLARE(ks_status_t) blade_connection_shutdown(blade_connection_t *bc)
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{
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cJSON *json = NULL;
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ks_assert(bc);
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blade_handle_connections_remove(bc);
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while (ks_q_trypop(bc->sending, (void **)&json) == KS_STATUS_SUCCESS && json) cJSON_Delete(json);
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ks_log(KS_LOG_DEBUG, "Stopped\n");
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return KS_STATUS_SUCCESS;
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}
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KS_DECLARE(blade_handle_t *) blade_connection_handle_get(blade_connection_t *bc)
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{
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ks_assert(bc);
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return bc->handle;
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}
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KS_DECLARE(ks_pool_t *) blade_connection_pool_get(blade_connection_t *bc)
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{
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ks_assert(bc);
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return bc->pool;
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}
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KS_DECLARE(const char *) blade_connection_id_get(blade_connection_t *bc)
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{
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ks_assert(bc);
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return bc->id;
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}
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KS_DECLARE(ks_status_t) blade_connection_read_lock(blade_connection_t *bc, ks_bool_t block)
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{
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ks_status_t ret = KS_STATUS_SUCCESS;
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ks_assert(bc);
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if (block) ret = ks_rwl_read_lock(bc->lock);
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else ret = ks_rwl_try_read_lock(bc->lock);
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return ret;
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}
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KS_DECLARE(ks_status_t) blade_connection_read_unlock(blade_connection_t *bc)
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{
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ks_assert(bc);
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return ks_rwl_read_unlock(bc->lock);
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}
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KS_DECLARE(ks_status_t) blade_connection_write_lock(blade_connection_t *bc, ks_bool_t block)
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{
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ks_status_t ret = KS_STATUS_SUCCESS;
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ks_assert(bc);
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if (block) ret = ks_rwl_write_lock(bc->lock);
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else ret = ks_rwl_try_write_lock(bc->lock);
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return ret;
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}
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KS_DECLARE(ks_status_t) blade_connection_write_unlock(blade_connection_t *bc)
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{
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ks_assert(bc);
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return ks_rwl_write_unlock(bc->lock);
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}
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KS_DECLARE(void *) blade_connection_transport_get(blade_connection_t *bc)
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{
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ks_assert(bc);
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return bc->transport_data;
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}
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KS_DECLARE(void) blade_connection_transport_set(blade_connection_t *bc, void *transport_data, blade_transport_callbacks_t *transport_callbacks)
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{
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ks_assert(bc);
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ks_assert(transport_data);
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ks_assert(transport_callbacks);
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bc->transport_data = transport_data;
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bc->transport_callbacks = transport_callbacks;
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}
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blade_transport_state_callback_t blade_connection_state_callback_lookup(blade_connection_t *bc, blade_connection_state_t state)
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{
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blade_transport_state_callback_t callback = NULL;
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ks_assert(bc);
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switch (state) {
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case BLADE_CONNECTION_STATE_DISCONNECT:
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if (bc->direction == BLADE_CONNECTION_DIRECTION_INBOUND) callback = bc->transport_callbacks->onstate_disconnect_inbound;
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else if(bc->direction == BLADE_CONNECTION_DIRECTION_OUTBOUND) callback = bc->transport_callbacks->onstate_disconnect_outbound;
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break;
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case BLADE_CONNECTION_STATE_NEW:
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if (bc->direction == BLADE_CONNECTION_DIRECTION_INBOUND) callback = bc->transport_callbacks->onstate_new_inbound;
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else if(bc->direction == BLADE_CONNECTION_DIRECTION_OUTBOUND) callback = bc->transport_callbacks->onstate_new_outbound;
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break;
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case BLADE_CONNECTION_STATE_CONNECT:
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if (bc->direction == BLADE_CONNECTION_DIRECTION_INBOUND) callback = bc->transport_callbacks->onstate_connect_inbound;
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else if(bc->direction == BLADE_CONNECTION_DIRECTION_OUTBOUND) callback = bc->transport_callbacks->onstate_connect_outbound;
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break;
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case BLADE_CONNECTION_STATE_ATTACH:
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if (bc->direction == BLADE_CONNECTION_DIRECTION_INBOUND) callback = bc->transport_callbacks->onstate_attach_inbound;
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else if(bc->direction == BLADE_CONNECTION_DIRECTION_OUTBOUND) callback = bc->transport_callbacks->onstate_attach_outbound;
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break;
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case BLADE_CONNECTION_STATE_DETACH:
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if (bc->direction == BLADE_CONNECTION_DIRECTION_INBOUND) callback = bc->transport_callbacks->onstate_detach_inbound;
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else if(bc->direction == BLADE_CONNECTION_DIRECTION_OUTBOUND) callback = bc->transport_callbacks->onstate_detach_outbound;
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break;
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case BLADE_CONNECTION_STATE_READY:
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if (bc->direction == BLADE_CONNECTION_DIRECTION_INBOUND) callback = bc->transport_callbacks->onstate_ready_inbound;
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else if(bc->direction == BLADE_CONNECTION_DIRECTION_OUTBOUND) callback = bc->transport_callbacks->onstate_ready_outbound;
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break;
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default: break;
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}
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return callback;
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}
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KS_DECLARE(void) blade_connection_state_set(blade_connection_t *bc, blade_connection_state_t state)
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{
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blade_transport_state_callback_t callback = NULL;
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blade_connection_state_hook_t hook = BLADE_CONNECTION_STATE_HOOK_SUCCESS;
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ks_assert(bc);
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ks_cond_lock(bc->cond);
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callback = blade_connection_state_callback_lookup(bc, state);
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if (callback) hook = callback(bc, BLADE_CONNECTION_STATE_CONDITION_PRE);
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bc->state = state;
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ks_cond_unlock(bc->cond);
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if (hook == BLADE_CONNECTION_STATE_HOOK_DISCONNECT) blade_connection_disconnect(bc);
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ks_cond_try_signal(bc->cond);
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}
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KS_DECLARE(blade_connection_state_t) blade_connection_state_get(blade_connection_t *bc)
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{
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ks_assert(bc);
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return bc->state;
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}
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KS_DECLARE(void) blade_connection_disconnect(blade_connection_t *bc)
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{
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ks_assert(bc);
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if (bc->state != BLADE_CONNECTION_STATE_DETACH && bc->state != BLADE_CONNECTION_STATE_DISCONNECT && bc->state != BLADE_CONNECTION_STATE_CLEANUP) {
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ks_log(KS_LOG_DEBUG, "Connection (%s) disconnecting\n", bc->id);
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blade_connection_state_set(bc, BLADE_CONNECTION_STATE_DETACH);
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}
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}
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KS_DECLARE(ks_status_t) blade_connection_sending_push(blade_connection_t *bc, cJSON *json)
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{
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cJSON *json_copy = NULL;
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ks_assert(bc);
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ks_assert(json);
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json_copy = cJSON_Duplicate(json, 1);
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return ks_q_push(bc->sending, json_copy);
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}
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KS_DECLARE(ks_status_t) blade_connection_sending_pop(blade_connection_t *bc, cJSON **json)
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{
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ks_assert(bc);
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ks_assert(json);
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return ks_q_trypop(bc->sending, (void **)json);
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}
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KS_DECLARE(const char *) blade_connection_session_get(blade_connection_t *bc)
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{
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ks_assert(bc);
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return bc->session;
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}
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KS_DECLARE(void) blade_connection_session_set(blade_connection_t *bc, const char *id)
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{
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ks_assert(bc);
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if (bc->session) ks_pool_free(bc->pool, &bc->session);
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bc->session = ks_pstrdup(bc->pool, id);
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}
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void *blade_connection_state_thread(ks_thread_t *thread, void *data)
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{
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blade_connection_t *bc = NULL;
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blade_connection_state_t state;
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ks_bool_t shutdown = KS_FALSE;
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ks_assert(thread);
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ks_assert(data);
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bc = (blade_connection_t *)data;
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ks_cond_lock(bc->cond);
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while (!shutdown) {
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// Entering the call below, the mutex is expected to be locked and will be unlocked by the call
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ks_cond_timedwait(bc->cond, 100);
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// Leaving the call above, the mutex will be locked after being signalled, timing out, or woken up for any reason
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state = bc->state;
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switch (state) {
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case BLADE_CONNECTION_STATE_DISCONNECT:
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blade_connection_state_on_disconnect(bc);
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shutdown = KS_TRUE;
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break;
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case BLADE_CONNECTION_STATE_NEW:
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blade_connection_state_on_new(bc);
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break;
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case BLADE_CONNECTION_STATE_CONNECT:
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blade_connection_state_on_connect(bc);
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break;
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case BLADE_CONNECTION_STATE_ATTACH:
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blade_connection_state_on_attach(bc);
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break;
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case BLADE_CONNECTION_STATE_DETACH:
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blade_connection_state_on_detach(bc);
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break;
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case BLADE_CONNECTION_STATE_READY:
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blade_connection_state_on_ready(bc);
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break;
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default: break;
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}
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}
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ks_cond_unlock(bc->cond);
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blade_connection_destroy(&bc);
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return NULL;
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}
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ks_status_t blade_connection_state_on_disconnect(blade_connection_t *bc)
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{
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blade_transport_state_callback_t callback = NULL;
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ks_assert(bc);
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callback = blade_connection_state_callback_lookup(bc, BLADE_CONNECTION_STATE_DISCONNECT);
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if (callback) callback(bc, BLADE_CONNECTION_STATE_CONDITION_POST);
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blade_connection_state_set(bc, BLADE_CONNECTION_STATE_CLEANUP);
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return KS_STATUS_SUCCESS;
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}
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ks_status_t blade_connection_state_on_new(blade_connection_t *bc)
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{
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blade_transport_state_callback_t callback = NULL;
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blade_connection_state_hook_t hook = BLADE_CONNECTION_STATE_HOOK_SUCCESS;
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ks_assert(bc);
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callback = blade_connection_state_callback_lookup(bc, BLADE_CONNECTION_STATE_NEW);
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if (callback) hook = callback(bc, BLADE_CONNECTION_STATE_CONDITION_POST);
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if (hook == BLADE_CONNECTION_STATE_HOOK_DISCONNECT) blade_connection_disconnect(bc);
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else if (hook == BLADE_CONNECTION_STATE_HOOK_SUCCESS) {
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blade_connection_state_set(bc, BLADE_CONNECTION_STATE_CONNECT);
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}
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return KS_STATUS_SUCCESS;
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}
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ks_status_t blade_connection_state_on_connect(blade_connection_t *bc)
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{
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blade_transport_state_callback_t callback = NULL;
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blade_connection_state_hook_t hook = BLADE_CONNECTION_STATE_HOOK_SUCCESS;
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ks_assert(bc);
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callback = blade_connection_state_callback_lookup(bc, BLADE_CONNECTION_STATE_CONNECT);
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if (callback) hook = callback(bc, BLADE_CONNECTION_STATE_CONDITION_POST);
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if (hook == BLADE_CONNECTION_STATE_HOOK_DISCONNECT) blade_connection_disconnect(bc);
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else if (hook == BLADE_CONNECTION_STATE_HOOK_SUCCESS) {
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blade_connection_state_set(bc, BLADE_CONNECTION_STATE_ATTACH);
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}
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return KS_STATUS_SUCCESS;
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}
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ks_status_t blade_connection_state_on_attach(blade_connection_t *bc)
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{
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blade_transport_state_callback_t callback = NULL;
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blade_connection_state_hook_t hook = BLADE_CONNECTION_STATE_HOOK_SUCCESS;
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ks_assert(bc);
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callback = blade_connection_state_callback_lookup(bc, BLADE_CONNECTION_STATE_ATTACH);
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if (callback) hook = callback(bc, BLADE_CONNECTION_STATE_CONDITION_POST);
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if (hook == BLADE_CONNECTION_STATE_HOOK_DISCONNECT) blade_connection_disconnect(bc);
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else if (hook == BLADE_CONNECTION_STATE_HOOK_SUCCESS) {
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// @todo this is adding a second lock, since we keep it locked in the callback to allow finishing, we don't want get locking here...
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// or just try unlocking twice to confirm...
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blade_session_t *bs = blade_handle_sessions_get(bc->handle, bc->session);
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ks_assert(bs); // should not happen because bs should still be locked
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blade_session_connections_add(bs, bc->id);
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blade_connection_state_set(bc, BLADE_CONNECTION_STATE_READY);
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blade_session_state_set(bs, BLADE_SESSION_STATE_READY); // @todo only set this if it's not already in the READY state from prior connection
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blade_session_read_unlock(bs); // unlock the session we locked obtaining it above
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blade_session_read_unlock(bs); // unlock the session we expect to be locked during the callback to ensure we can finish attaching
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}
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return KS_STATUS_SUCCESS;
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}
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ks_status_t blade_connection_state_on_detach(blade_connection_t *bc)
|
|
{
|
|
blade_transport_state_callback_t callback = NULL;
|
|
|
|
ks_assert(bc);
|
|
|
|
callback = blade_connection_state_callback_lookup(bc, BLADE_CONNECTION_STATE_DETACH);
|
|
if (callback) callback(bc, BLADE_CONNECTION_STATE_CONDITION_POST);
|
|
|
|
if (bc->session) {
|
|
blade_session_t *bs = blade_handle_sessions_get(bc->handle, bc->session);
|
|
ks_assert(bs);
|
|
|
|
blade_session_connections_remove(bs, bc->id);
|
|
blade_session_read_unlock(bs);
|
|
// keep bc->session for later in case something triggers a reconnect later and needs the old session id for a hint
|
|
}
|
|
blade_connection_state_set(bc, BLADE_CONNECTION_STATE_DISCONNECT);
|
|
|
|
return KS_STATUS_SUCCESS;
|
|
}
|
|
|
|
ks_status_t blade_connection_state_on_ready(blade_connection_t *bc)
|
|
{
|
|
blade_transport_state_callback_t callback = NULL;
|
|
blade_connection_state_hook_t hook = BLADE_CONNECTION_STATE_HOOK_SUCCESS;
|
|
cJSON *json = NULL;
|
|
blade_session_t *bs = NULL;
|
|
ks_bool_t done = KS_FALSE;
|
|
|
|
ks_assert(bc);
|
|
|
|
while (blade_connection_sending_pop(bc, &json) == KS_STATUS_SUCCESS && json) {
|
|
ks_status_t ret = bc->transport_callbacks->onsend(bc, json);
|
|
cJSON_Delete(json);
|
|
|
|
if (ret != KS_STATUS_SUCCESS) {
|
|
blade_connection_disconnect(bc);
|
|
break;
|
|
}
|
|
}
|
|
|
|
while (!done) {
|
|
if (bc->transport_callbacks->onreceive(bc, &json) != KS_STATUS_SUCCESS) {
|
|
blade_connection_disconnect(bc);
|
|
break;
|
|
}
|
|
|
|
if (!(done = (json == NULL))) {
|
|
if (!bs) {
|
|
bs = blade_handle_sessions_get(bc->handle, bc->session);
|
|
ks_assert(bs);
|
|
}
|
|
blade_session_receiving_push(bs, json);
|
|
cJSON_Delete(json);
|
|
json = NULL;
|
|
}
|
|
}
|
|
if (bs) blade_session_read_unlock(bs);
|
|
|
|
callback = blade_connection_state_callback_lookup(bc, BLADE_CONNECTION_STATE_READY);
|
|
if (callback) hook = callback(bc, BLADE_CONNECTION_STATE_CONDITION_POST);
|
|
|
|
if (hook == BLADE_CONNECTION_STATE_HOOK_DISCONNECT) blade_connection_disconnect(bc);
|
|
|
|
return KS_STATUS_SUCCESS;
|
|
}
|
|
|
|
|
|
/* For Emacs:
|
|
* Local Variables:
|
|
* mode:c
|
|
* indent-tabs-mode:t
|
|
* tab-width:4
|
|
* c-basic-offset:4
|
|
* End:
|
|
* For VIM:
|
|
* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
|
|
*/
|