// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef _ESP_TRANSPORT_H_
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#define _ESP_TRANSPORT_H_
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#include <esp_err.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct esp_transport_list_t* esp_transport_list_handle_t;
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typedef struct esp_transport_item_t* esp_transport_handle_t;
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typedef int (*connect_func)(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
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typedef int (*io_func)(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms);
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typedef int (*io_read_func)(esp_transport_handle_t t, char *buffer, int len, int timeout_ms);
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typedef int (*trans_func)(esp_transport_handle_t t);
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typedef int (*poll_func)(esp_transport_handle_t t, int timeout_ms);
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typedef int (*connect_async_func)(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
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typedef esp_transport_handle_t (*payload_transfer_func)(esp_transport_handle_t);
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/**
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* @brief Create transport list
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*
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* @return A handle can hold all transports
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*/
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esp_transport_list_handle_t esp_transport_list_init();
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/**
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* @brief Cleanup and free all transports, include itself,
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* this function will invoke esp_transport_destroy of every transport have added this the list
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*
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* @param[in] list The list
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*
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* @return
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* - ESP_OK
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* - ESP_FAIL
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*/
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esp_err_t esp_transport_list_destroy(esp_transport_list_handle_t list);
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/**
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* @brief Add a transport to the list, and define a scheme to indentify this transport in the list
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*
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* @param[in] list The list
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* @param[in] t The Transport
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* @param[in] scheme The scheme
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*
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* @return
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* - ESP_OK
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*/
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esp_err_t esp_transport_list_add(esp_transport_list_handle_t list, esp_transport_handle_t t, const char *scheme);
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/**
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* @brief This function will remove all transport from the list,
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* invoke esp_transport_destroy of every transport have added this the list
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*
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* @param[in] list The list
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*
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* @return
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* - ESP_OK
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* - ESP_ERR_INVALID_ARG
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*/
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esp_err_t esp_transport_list_clean(esp_transport_list_handle_t list);
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/**
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* @brief Get the transport by scheme, which has been defined when calling function `esp_transport_list_add`
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*
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* @param[in] list The list
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* @param[in] tag The tag
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*
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* @return The transport handle
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*/
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esp_transport_handle_t esp_transport_list_get_transport(esp_transport_list_handle_t list, const char *scheme);
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/**
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* @brief Initialize a transport handle object
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*
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* @return The transport handle
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*/
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esp_transport_handle_t esp_transport_init();
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/**
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* @brief Cleanup and free memory the transport
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*
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* @param[in] t The transport handle
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*
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* @return
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* - ESP_OK
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* - ESP_FAIL
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*/
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esp_err_t esp_transport_destroy(esp_transport_handle_t t);
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/**
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* @brief Get default port number used by this transport
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*
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* @param[in] t The transport handle
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*
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* @return the port number
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*/
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int esp_transport_get_default_port(esp_transport_handle_t t);
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/**
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* @brief Set default port number that can be used by this transport
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*
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* @param[in] t The transport handle
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* @param[in] port The port number
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*
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* @return
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* - ESP_OK
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* - ESP_FAIL
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*/
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esp_err_t esp_transport_set_default_port(esp_transport_handle_t t, int port);
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/**
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* @brief Transport connection function, to make a connection to server
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*
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* @param t The transport handle
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* @param[in] host Hostname
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* @param[in] port Port
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* @param[in] timeout_ms The timeout milliseconds
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*
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* @return
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* - socket for will use by this transport
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* - (-1) if there are any errors, should check errno
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*/
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int esp_transport_connect(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
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/**
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* @brief Non-blocking transport connection function, to make a connection to server
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*
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* @param t The transport handle
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* @param[in] host Hostname
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* @param[in] port Port
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* @param[in] timeout_ms The timeout milliseconds
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*
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* @return
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* - socket for will use by this transport
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* - (-1) if there are any errors, should check errno
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*/
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int esp_transport_connect_async(esp_transport_handle_t t, const char *host, int port, int timeout_ms);
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/**
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* @brief Transport read function
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*
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* @param t The transport handle
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* @param buffer The buffer
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* @param[in] len The length
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* @param[in] timeout_ms The timeout milliseconds
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*
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* @return
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* - Number of bytes was read
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* - (-1) if there are any errors, should check errno
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*/
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int esp_transport_read(esp_transport_handle_t t, char *buffer, int len, int timeout_ms);
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/**
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* @brief Poll the transport until readable or timeout
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*
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* @param[in] t The transport handle
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* @param[in] timeout_ms The timeout milliseconds
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*
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* @return
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* - 0 Timeout
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* - (-1) If there are any errors, should check errno
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* - other The transport can read
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*/
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int esp_transport_poll_read(esp_transport_handle_t t, int timeout_ms);
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/**
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* @brief Transport write function
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*
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* @param t The transport handle
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* @param buffer The buffer
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* @param[in] len The length
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* @param[in] timeout_ms The timeout milliseconds
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*
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* @return
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* - Number of bytes was written
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* - (-1) if there are any errors, should check errno
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*/
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int esp_transport_write(esp_transport_handle_t t, const char *buffer, int len, int timeout_ms);
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/**
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* @brief Poll the transport until writeable or timeout
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*
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* @param[in] t The transport handle
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* @param[in] timeout_ms The timeout milliseconds
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*
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* @return
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* - 0 Timeout
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* - (-1) If there are any errors, should check errno
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* - other The transport can write
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*/
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int esp_transport_poll_write(esp_transport_handle_t t, int timeout_ms);
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/**
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* @brief Transport close
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*
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* @param t The transport handle
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*
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* @return
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* - 0 if ok
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* - (-1) if there are any errors, should check errno
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*/
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int esp_transport_close(esp_transport_handle_t t);
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/**
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* @brief Get user data context of this transport
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*
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* @param[in] t The transport handle
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*
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* @return The user data context
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*/
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void *esp_transport_get_context_data(esp_transport_handle_t t);
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/**
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* @brief Get transport handle of underlying protocol
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* which can access this protocol payload directly
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* (used for receiving longer msg multiple times)
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*
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* @param[in] t The transport handle
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*
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* @return Payload transport handle
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*/
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esp_transport_handle_t esp_transport_get_payload_transport_handle(esp_transport_handle_t t);
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/**
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* @brief Set the user context data for this transport
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*
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* @param[in] t The transport handle
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* @param data The user data context
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*
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* @return
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* - ESP_OK
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*/
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esp_err_t esp_transport_set_context_data(esp_transport_handle_t t, void *data);
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/**
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* @brief Set transport functions for the transport handle
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*
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* @param[in] t The transport handle
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* @param[in] _connect The connect function pointer
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* @param[in] _read The read function pointer
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* @param[in] _write The write function pointer
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* @param[in] _close The close function pointer
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* @param[in] _poll_read The poll read function pointer
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* @param[in] _poll_write The poll write function pointer
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* @param[in] _destroy The destroy function pointer
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*
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* @return
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* - ESP_OK
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*/
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esp_err_t esp_transport_set_func(esp_transport_handle_t t,
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connect_func _connect,
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io_read_func _read,
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io_func _write,
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trans_func _close,
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poll_func _poll_read,
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poll_func _poll_write,
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trans_func _destroy);
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/**
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* @brief Set transport functions for the transport handle
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*
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* @param[in] t The transport handle
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* @param[in] _connect_async_func The connect_async function pointer
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*
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* @return
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* - ESP_OK
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* - ESP_FAIL
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*/
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esp_err_t esp_transport_set_async_connect_func(esp_transport_handle_t t, connect_async_func _connect_async_func);
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/**
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* @brief Set parent transport function to the handle
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*
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* @param[in] t The transport handle
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* @param[in] _parent_transport The underlying transport getter pointer
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*
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* @return
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* - ESP_OK
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* - ESP_FAIL
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*/
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esp_err_t esp_transport_set_parent_transport_func(esp_transport_handle_t t, payload_transfer_func _parent_transport);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ESP_TRANSPORT_ */
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