// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// 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.
#ifndef _ESP_TRANSPORT_H_
#define _ESP_TRANSPORT_H_
#include <esp_err.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef struct esp_transport_list_t* esp_transport_list_handle_t;
typedef struct esp_transport_item_t* esp_transport_handle_t;
typedef int (*connect_func)(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
typedef int (*io_func)(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms);
typedef int (*io_read_func)(esp_transport_handle_t t, char *buffer, int len, int timeout_ms);
typedef int (*trans_func)(esp_transport_handle_t t);
typedef int (*poll_func)(esp_transport_handle_t t, int timeout_ms);
typedef int (*connect_async_func)(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
typedef esp_transport_handle_t (*payload_transfer_func)(esp_transport_handle_t);
/**
* @brief Create transport list
*
* @return A handle can hold all transports
*/
esp_transport_list_handle_t esp_transport_list_init();
/**
* @brief Cleanup and free all transports, include itself,
* this function will invoke esp_transport_destroy of every transport have added this the list
*
* @param[in] list The list
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_transport_list_destroy(esp_transport_list_handle_t list);
/**
* @brief Add a transport to the list, and define a scheme to indentify this transport in the list
*
* @param[in] list The list
* @param[in] t The Transport
* @param[in] scheme The scheme
*
* @return
* - ESP_OK
*/
esp_err_t esp_transport_list_add(esp_transport_list_handle_t list, esp_transport_handle_t t, const char *scheme);
/**
* @brief This function will remove all transport from the list,
* invoke esp_transport_destroy of every transport have added this the list
*
* @param[in] list The list
*
* @return
* - ESP_OK
* - ESP_ERR_INVALID_ARG
*/
esp_err_t esp_transport_list_clean(esp_transport_list_handle_t list);
/**
* @brief Get the transport by scheme, which has been defined when calling function `esp_transport_list_add`
*
* @param[in] list The list
* @param[in] tag The tag
*
* @return The transport handle
*/
esp_transport_handle_t esp_transport_list_get_transport(esp_transport_list_handle_t list, const char *scheme);
/**
* @brief Initialize a transport handle object
*
* @return The transport handle
*/
esp_transport_handle_t esp_transport_init();
/**
* @brief Cleanup and free memory the transport
*
* @param[in] t The transport handle
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_transport_destroy(esp_transport_handle_t t);
/**
* @brief Get default port number used by this transport
*
* @param[in] t The transport handle
*
* @return the port number
*/
int esp_transport_get_default_port(esp_transport_handle_t t);
/**
* @brief Set default port number that can be used by this transport
*
* @param[in] t The transport handle
* @param[in] port The port number
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_transport_set_default_port(esp_transport_handle_t t, int port);
/**
* @brief Transport connection function, to make a connection to server
*
* @param t The transport handle
* @param[in] host Hostname
* @param[in] port Port
* @param[in] timeout_ms The timeout milliseconds
*
* @return
* - socket for will use by this transport
* - (-1) if there are any errors, should check errno
*/
int esp_transport_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
/**
* @brief Non-blocking transport connection function, to make a connection to server
*
* @param t The transport handle
* @param[in] host Hostname
* @param[in] port Port
* @param[in] timeout_ms The timeout milliseconds
*
* @return
* - socket for will use by this transport
* - (-1) if there are any errors, should check errno
*/
int esp_transport_connect_async(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
/**
* @brief Transport read function
*
* @param t The transport handle
* @param buffer The buffer
* @param[in] len The length
* @param[in] timeout_ms The timeout milliseconds
*
* @return
* - Number of bytes was read
* - (-1) if there are any errors, should check errno
*/
int esp_transport_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms);
/**
* @brief Poll the transport until readable or timeout
*
* @param[in] t The transport handle
* @param[in] timeout_ms The timeout milliseconds
*
* @return
* - 0 Timeout
* - (-1) If there are any errors, should check errno
* - other The transport can read
*/
int esp_transport_poll_read(esp_transport_handle_t t, int timeout_ms);
/**
* @brief Transport write function
*
* @param t The transport handle
* @param buffer The buffer
* @param[in] len The length
* @param[in] timeout_ms The timeout milliseconds
*
* @return
* - Number of bytes was written
* - (-1) if there are any errors, should check errno
*/
int esp_transport_write(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms);
/**
* @brief Poll the transport until writeable or timeout
*
* @param[in] t The transport handle
* @param[in] timeout_ms The timeout milliseconds
*
* @return
* - 0 Timeout
* - (-1) If there are any errors, should check errno
* - other The transport can write
*/
int esp_transport_poll_write(esp_transport_handle_t t, int timeout_ms);
/**
* @brief Transport close
*
* @param t The transport handle
*
* @return
* - 0 if ok
* - (-1) if there are any errors, should check errno
*/
int esp_transport_close(esp_transport_handle_t t);
/**
* @brief Get user data context of this transport
*
* @param[in] t The transport handle
*
* @return The user data context
*/
void *esp_transport_get_context_data(esp_transport_handle_t t);
/**
* @brief Get transport handle of underlying protocol
* which can access this protocol payload directly
* (used for receiving longer msg multiple times)
*
* @param[in] t The transport handle
*
* @return Payload transport handle
*/
esp_transport_handle_t esp_transport_get_payload_transport_handle(esp_transport_handle_t t);
/**
* @brief Set the user context data for this transport
*
* @param[in] t The transport handle
* @param data The user data context
*
* @return
* - ESP_OK
*/
esp_err_t esp_transport_set_context_data(esp_transport_handle_t t, void *data);
/**
* @brief Set transport functions for the transport handle
*
* @param[in] t The transport handle
* @param[in] _connect The connect function pointer
* @param[in] _read The read function pointer
* @param[in] _write The write function pointer
* @param[in] _close The close function pointer
* @param[in] _poll_read The poll read function pointer
* @param[in] _poll_write The poll write function pointer
* @param[in] _destroy The destroy function pointer
* @param[in] _parrent_transport The parrent transfer getter pointer
*
* @return
* - ESP_OK
*/
esp_err_t esp_transport_set_func(esp_transport_handle_t t,
connect_func _connect,
io_read_func _read,
io_func _write,
trans_func _close,
poll_func _poll_read,
poll_func _poll_write,
trans_func _destroy,
payload_transfer_func _parrent_transport);
/**
* @brief Set transport functions for the transport handle
*
* @param[in] t The transport handle
* @param[in] _connect_async_func The connect_async function pointer
*
* @return
* - ESP_OK
* - ESP_FAIL
*/
esp_err_t esp_transport_set_async_connect_func(esp_transport_handle_t t, connect_async_func _connect_async_func);
#ifdef __cplusplus
}
#endif
#endif /* _ESP_TRANSPORT_ */