267 lines
11 KiB
C
267 lines
11 KiB
C
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// Copyright 2017 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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//
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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_EXAMPLE_SH2_LIB_H_
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#define __ESP_EXAMPLE_SH2_LIB_H_
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#include <openssl/ssl.h>
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#include <nghttp2/nghttp2.h>
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/*
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* This is a thin API wrapper over nghttp2 that offers simplified APIs for usage
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* in the application. The intention of this wrapper is to act as a stepping
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* stone to quickly get started with using the HTTP/2 client. Since the focus is
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* on simplicity, not all the features of HTTP/2 are supported through this
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* wrapper. Once you are fairly comfortable with nghttp2, feel free to directly
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* use nghttp2 APIs or make changes to sh2lib.c for realising your objectives.
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*
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* TODO:
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* - Allowing to query response code, content-type etc in the receive callback
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* - A simple function for per-stream header callback
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*/
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/**
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* @brief Handle for working with sh2lib APIs
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*/
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struct sh2lib_handle {
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/* Ideally, CTX is per-program, so we could potentially take it out of this
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* per-connection structure
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*/
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SSL_CTX *ssl_ctx; /*!< Pointer to the SSL context */
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SSL *ssl; /*!< Pointer to the SSL handle */
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nghttp2_session *http2_sess; /*!< Pointer to the HTTP2 session handle */
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int sockfd; /*!< Socket file descriptor */
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};
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/** Flag indicating receive stream is reset */
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#define DATA_RECV_RST_STREAM 1
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/** Flag indicating frame is completely received */
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#define DATA_RECV_FRAME_COMPLETE 2
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/**
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* @brief Function Prototype for data receive callback
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*
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* This function gets called whenever data is received on any stream. The
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* function is also called for indicating events like frame receive complete, or
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* end of stream. The function may get called multiple times as long as data is
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* received on the stream.
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*
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* @param[in] handle Pointer to the sh2lib handle.
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* @param[in] data Pointer to a buffer that contains the data received.
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* @param[in] len The length of valid data stored at the 'data' pointer.
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* @param[in] flags Flags indicating whether the stream is reset (DATA_RECV_RST_STREAM) or
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* this particularly frame is completely received
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* DATA_RECV_FRAME_COMPLETE).
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*
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* @return The function should return 0
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*/
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typedef int (*sh2lib_frame_data_recv_cb_t)(struct sh2lib_handle *handle, const char *data, size_t len, int flags);
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/**
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* @brief Function Prototype for callback to send data in PUT/POST
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*
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* This function gets called whenever nghttp2 wishes to send data, like for
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* PUT/POST requests to the server. The function keeps getting called until this
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* function sets the flag NGHTTP2_DATA_FLAG_EOF to indicate end of data.
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*
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* @param[in] handle Pointer to the sh2lib handle.
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* @param[out] data Pointer to a buffer that should contain the data to send.
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* @param[in] len The maximum length of data that can be sent out by this function.
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* @param[out] data_flags Pointer to the data flags. The NGHTTP2_DATA_FLAG_EOF
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* should be set in the data flags to indicate end of new data.
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*
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* @return The function should return the number of valid bytes stored in the
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* data pointer
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*/
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typedef int (*sh2lib_putpost_data_cb_t)(struct sh2lib_handle *handle, char *data, size_t len, uint32_t *data_flags);
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/**
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* @brief Connect to a URI using HTTP/2
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*
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* This API opens an HTTP/2 connection with the provided URI. If successful, the
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* hd pointer is populated with a valid handle for subsequent communication.
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*
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* Only 'https' URIs are supported.
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*
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* @param[out] hd Pointer to a variable of the type 'struct sh2lib_handle'.
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* @param[in] uri Pointer to the URI that should be connected to.
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*
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* @return
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* - ESP_OK if the connection was successful
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* - ESP_FAIL if the connection fails
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*/
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int sh2lib_connect(struct sh2lib_handle *hd, const char *uri);
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/**
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* @brief Free a sh2lib handle
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*
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* This API frees-up an sh2lib handle, thus closing any open connections that
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* may be associated with this handle, and freeing up any resources.
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*
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* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
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*
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*/
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void sh2lib_free(struct sh2lib_handle *hd);
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/**
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* @brief Setup an HTTP GET request stream
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*
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* This API sets up an HTTP GET request to be sent out to the server. A new
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* stream is created for handling the request. Once the request is setup, the
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* API sh2lib_execute() must be called to actually perform the socket I/O with
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* the server.
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*
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* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
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* @param[in] path Pointer to the string that contains the resource to
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* perform the HTTP GET operation on (for example, /users).
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* @param[in] recv_cb The callback function that should be called for
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* processing the request's response
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*
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* @return
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* - ESP_OK if request setup is successful
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* - ESP_FAIL if the request setup fails
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*/
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int sh2lib_do_get(struct sh2lib_handle *hd, const char *path, sh2lib_frame_data_recv_cb_t recv_cb);
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/**
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* @brief Setup an HTTP POST request stream
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*
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* This API sets up an HTTP POST request to be sent out to the server. A new
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* stream is created for handling the request. Once the request is setup, the
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* API sh2lib_execute() must be called to actually perform the socket I/O with
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* the server.
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*
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* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
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* @param[in] path Pointer to the string that contains the resource to
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* perform the HTTP POST operation on (for example, /users).
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* @param[in] send_cb The callback function that should be called for
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* sending data as part of this request.
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* @param[in] recv_cb The callback function that should be called for
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* processing the request's response
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*
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* @return
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* - ESP_OK if request setup is successful
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* - ESP_FAIL if the request setup fails
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*/
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int sh2lib_do_post(struct sh2lib_handle *hd, const char *path,
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sh2lib_putpost_data_cb_t send_cb,
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sh2lib_frame_data_recv_cb_t recv_cb);
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/**
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* @brief Setup an HTTP PUT request stream
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*
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* This API sets up an HTTP PUT request to be sent out to the server. A new
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* stream is created for handling the request. Once the request is setup, the
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* API sh2lib_execute() must be called to actually perform the socket I/O with
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* the server.
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*
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* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
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* @param[in] path Pointer to the string that contains the resource to
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* perform the HTTP PUT operation on (for example, /users).
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* @param[in] send_cb The callback function that should be called for
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* sending data as part of this request.
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* @param[in] recv_cb The callback function that should be called for
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* processing the request's response
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*
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* @return
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* - ESP_OK if request setup is successful
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* - ESP_FAIL if the request setup fails
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*/
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int sh2lib_do_put(struct sh2lib_handle *hd, const char *path,
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sh2lib_putpost_data_cb_t send_cb,
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sh2lib_frame_data_recv_cb_t recv_cb);
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/**
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* @brief Execute send/receive on an HTTP/2 connection
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*
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* While the API sh2lib_do_get(), sh2lib_do_post() setup the requests to be
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* initiated with the server, this API performs the actual data send/receive
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* operations on the HTTP/2 connection. The callback functions are accordingly
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* called during the processing of these requests.
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*
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* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'
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*
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* @return
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* - ESP_OK if the connection was successful
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* - ESP_FAIL if the connection fails
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*/
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int sh2lib_execute(struct sh2lib_handle *hd);
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#define SH2LIB_MAKE_NV(NAME, VALUE) \
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{ \
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(uint8_t *)NAME, (uint8_t *)VALUE, strlen(NAME), strlen(VALUE), \
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NGHTTP2_NV_FLAG_NONE \
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}
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/**
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* @brief Setup an HTTP GET request stream with custom name-value pairs
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*
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* For a simpler version of the API, please refer to sh2lib_do_get().
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*
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* This API sets up an HTTP GET request to be sent out to the server. A new
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* stream is created for handling the request. Once the request is setup, the
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* API sh2lib_execute() must be called to actually perform the socket I/O with
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* the server.
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*
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* Please note that the following name value pairs MUST be a part of the request
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* - name:value
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* - ":method":"GET"
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* - ":scheme":"https"
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* - ":path":<the-path-for-the-GET-operation> (for example, /users)
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*
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* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
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* @param[in] nva An array of name-value pairs that should be part of the request.
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* @param[in] nvlen The number of elements in the array pointed to by 'nva'.
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* @param[in] recv_cb The callback function that should be called for
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* processing the request's response
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*
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* @return
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* - ESP_OK if request setup is successful
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* - ESP_FAIL if the request setup fails
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*/
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int sh2lib_do_get_with_nv(struct sh2lib_handle *hd, const nghttp2_nv *nva, size_t nvlen, sh2lib_frame_data_recv_cb_t recv_cb);
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/**
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* @brief Setup an HTTP PUT/POST request stream with custom name-value pairs
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*
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* For a simpler version of the API, please refer to sh2lib_do_put() or
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* sh2lib_do_post().
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*
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* This API sets up an HTTP PUT/POST request to be sent out to the server. A new
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* stream is created for handling the request. Once the request is setup, the
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* API sh2lib_execute() must be called to actually perform the socket I/O with
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* the server.
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*
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* Please note that the following name value pairs MUST be a part of the request
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* - name:value
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* - ":method":"PUT" (or POST)
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* - ":scheme":"https"
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* - ":path":<the-path-for-the-PUT-operation> (for example, /users)
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*
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* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
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* @param[in] nva An array of name-value pairs that should be part of the request.
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* @param[in] nvlen The number of elements in the array pointed to by 'nva'.
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* @param[in] send_cb The callback function that should be called for
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* sending data as part of this request.
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* @param[in] recv_cb The callback function that should be called for
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* processing the request's response
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*
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* @return
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* - ESP_OK if request setup is successful
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* - ESP_FAIL if the request setup fails
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*/
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int sh2lib_do_putpost_with_nv(struct sh2lib_handle *hd, const nghttp2_nv *nva, size_t nvlen,
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sh2lib_putpost_data_cb_t send_cb,
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sh2lib_frame_data_recv_cb_t recv_cb);
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#endif /* ! __ESP_EXAMPLE_SH2_LIB_H_ */
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