[examples] Create HTTP2 example with http2.golang.org
Intention is to partition the demo into multiple files, so that the main program is quite easy to follow. 1. connectlib.c: For any URL parsing and TCP connection related stuff 2. sh2lib.c: Convenience functions for HTTP2+TLS. The goal here is to expose a simpler API than nghttp2. If most usecases end up being served with this library, it could potentially be moved into a separate component
This commit is contained in:
Kedar Sovani
parent
b65f47c586
commit
3ace8416b5
9
examples/protocols/http2_request/Makefile
Normal file
9
examples/protocols/http2_request/Makefile
Normal file
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@ -0,0 +1,9 @@
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#
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# This is a project Makefile. It is assumed the directory this Makefile resides in is a
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# project subdirectory.
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#
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PROJECT_NAME := http2-request
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include $(IDF_PATH)/make/project.mk
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6
examples/protocols/http2_request/README.md
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6
examples/protocols/http2_request/README.md
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@ -0,0 +1,6 @@
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# HTTP/2 Request Example
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Established HTTP/2 connection with https://http2.golang.org
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- Performs a GET on /clockstream
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- Performs a PUT on /ECHO
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@ -0,0 +1 @@
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COMPONENT_ADD_INCLUDEDIRS := .
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164
examples/protocols/http2_request/components/sh2lib/connectlib.c
Normal file
164
examples/protocols/http2_request/components/sh2lib/connectlib.c
Normal file
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@ -0,0 +1,164 @@
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/* With adaptations by Espressif Systems
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*
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* Copyright (c) 2013 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <netdb.h>
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#include "connectlib.h"
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/* Basic parser from nghttp2/examples/client.c */
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int parse_uri(struct uri *res, const char *uri)
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{
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/* We only interested in https */
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size_t len, i, offset;
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int ipv6addr = 0;
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memset(res, 0, sizeof(struct uri));
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len = strlen(uri);
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if (len < 9 || memcmp("https://", uri, 8) != 0) {
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return -1;
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}
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offset = 8;
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res->host = res->hostport = &uri[offset];
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res->hostlen = 0;
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if (uri[offset] == '[') {
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/* IPv6 literal address */
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++offset;
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++res->host;
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ipv6addr = 1;
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for (i = offset; i < len; ++i) {
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if (uri[i] == ']') {
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res->hostlen = i - offset;
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offset = i + 1;
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break;
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}
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}
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} else {
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const char delims[] = ":/?#";
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for (i = offset; i < len; ++i) {
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if (strchr(delims, uri[i]) != NULL) {
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break;
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}
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}
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res->hostlen = i - offset;
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offset = i;
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}
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if (res->hostlen == 0) {
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return -1;
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}
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/* Assuming https */
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res->port = 443;
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if (offset < len) {
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if (uri[offset] == ':') {
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/* port */
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const char delims[] = "/?#";
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int port = 0;
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++offset;
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for (i = offset; i < len; ++i) {
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if (strchr(delims, uri[i]) != NULL) {
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break;
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}
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if ('0' <= uri[i] && uri[i] <= '9') {
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port *= 10;
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port += uri[i] - '0';
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if (port > 65535) {
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return -1;
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}
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} else {
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return -1;
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}
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}
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if (port == 0) {
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return -1;
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}
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offset = i;
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res->port = (uint16_t)port;
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}
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}
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res->hostportlen = (size_t)(uri + offset + ipv6addr - res->host);
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for (i = offset; i < len; ++i) {
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if (uri[i] == '#') {
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break;
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}
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}
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if (i - offset == 0) {
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res->path = "/";
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res->pathlen = 1;
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} else {
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res->path = &uri[offset];
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res->pathlen = i - offset;
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}
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return 0;
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}
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int connect_to_host(const char *host, size_t hostlen, uint16_t port)
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{
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int ret;
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struct addrinfo hints = {
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.ai_family = AF_UNSPEC,
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.ai_socktype = SOCK_STREAM,
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};
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char service[6];
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snprintf(service, sizeof(service), "%u", port);
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char *use_host = calloc(1, hostlen + 1);
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if (!use_host) {
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return -1;
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}
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strncpy(use_host, host, hostlen);
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struct addrinfo *res;
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ret = getaddrinfo(use_host, service, &hints, &res);
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if (ret) {
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free(use_host);
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return -1;
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}
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free(use_host);
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ret = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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if (ret < 0) {
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goto err_freeaddr;
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}
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int fd = ret;
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ret = connect(fd, res->ai_addr, res->ai_addrlen);
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if (ret < 0) {
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goto err_freesocket;
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}
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return fd;
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err_freesocket:
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close(fd);
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err_freeaddr:
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freeaddrinfo(res);
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return -1;
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}
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@ -0,0 +1,34 @@
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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_CONNECT_LIB_H_
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#define __ESP_EXAMPLE_CONNECT_LIB_H_
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struct uri {
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const char *host;
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/* In this program, path contains query component as well. */
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const char *path;
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size_t pathlen;
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const char *hostport;
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size_t hostlen;
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size_t hostportlen;
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uint16_t port;
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};
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/* connect() to a TCP host, return socket descriptor */
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int connect_to_host(const char *host, size_t hostlen, uint16_t port);
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/* Parse a URI into its components */
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int parse_uri(struct uri *res, const char *uri);
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#endif /* ! __ESP_EXAMPLE_CONNECT_LIB_H_ */
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418
examples/protocols/http2_request/components/sh2lib/sh2lib.c
Normal file
418
examples/protocols/http2_request/components/sh2lib/sh2lib.c
Normal file
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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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#include <stdlib.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <esp_log.h>
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#include "connectlib.h"
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#include "sh2lib.h"
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static const char *TAG = "sh2lib";
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#define DBG_FRAME_SEND 1
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/* SSL connection on the TCP socket that is already connected */
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static int do_ssl_connect(struct sh2lib_handle *hd, int sockfd, const char *hostname)
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{
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SSL_CTX *ssl_ctx = SSL_CTX_new(TLSv1_2_client_method());
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if (!ssl_ctx) {
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return -1;
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}
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unsigned char vector[] = "\x02h2";
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SSL_CTX_set_alpn_protos(ssl_ctx, vector, strlen((char *)vector));
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SSL *ssl = SSL_new(ssl_ctx);
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if (!ssl) {
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SSL_CTX_free(ssl_ctx);
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return -1;
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}
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SSL_set_tlsext_host_name(ssl, hostname);
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SSL_set_fd(ssl, sockfd);
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int ret = SSL_connect(ssl);
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if (ret < 1) {
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int err = SSL_get_error(ssl, ret);
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ESP_LOGE(TAG, "[ssl-connect] Failed SSL handshake ret=%d error=%d", ret, err);
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SSL_CTX_free(ssl_ctx);
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SSL_free(ssl);
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return -1;
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}
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hd->ssl_ctx = ssl_ctx;
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hd->ssl = ssl;
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hd->sockfd = sockfd;
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int flags = fcntl(hd->sockfd, F_GETFL, 0);
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fcntl(hd->sockfd, F_SETFL, flags | O_NONBLOCK);
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return 0;
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}
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/*
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* The implementation of nghttp2_send_callback type. Here we write
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* |data| with size |length| to the network and return the number of
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* bytes actually written. See the documentation of
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* nghttp2_send_callback for the details.
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*/
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static ssize_t callback_send_inner(struct sh2lib_handle *hd, const uint8_t *data,
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size_t length)
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{
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int rv = SSL_write(hd->ssl, data, (int)length);
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if (rv <= 0) {
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int err = SSL_get_error(hd->ssl, rv);
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if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ) {
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rv = NGHTTP2_ERR_WOULDBLOCK;
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} else {
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rv = NGHTTP2_ERR_CALLBACK_FAILURE;
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}
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}
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return rv;
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}
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static ssize_t callback_send(nghttp2_session *session, const uint8_t *data,
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size_t length, int flags, void *user_data)
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{
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int rv = 0;
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struct sh2lib_handle *hd = user_data;
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int copy_offset = 0;
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int pending_data = length;
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/* Send data in 1000 byte chunks */
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while (copy_offset != (length - 1)) {
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int chunk_len = pending_data > 1000 ? 1000 : pending_data;
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int subrv = callback_send_inner(hd, data + copy_offset, chunk_len);
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if (subrv <= 0) {
|
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if (copy_offset) {
|
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/* If some data was xferred, send the number of bytes
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* xferred */
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rv = copy_offset;
|
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} else {
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/* If not, send the error code */
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rv = subrv;
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}
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break;
|
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}
|
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copy_offset += chunk_len;
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pending_data -= chunk_len;
|
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}
|
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return rv;
|
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}
|
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|
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/*
|
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* The implementation of nghttp2_recv_callback type. Here we read data
|
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* from the network and write them in |buf|. The capacity of |buf| is
|
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* |length| bytes. Returns the number of bytes stored in |buf|. See
|
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* the documentation of nghttp2_recv_callback for the details.
|
||||
*/
|
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static ssize_t callback_recv(nghttp2_session *session, uint8_t *buf,
|
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size_t length, int flags, void *user_data)
|
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{
|
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struct sh2lib_handle *hd = user_data;
|
||||
int rv;
|
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rv = SSL_read(hd->ssl, buf, (int)length);
|
||||
if (rv < 0) {
|
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int err = SSL_get_error(hd->ssl, rv);
|
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if (err == SSL_ERROR_WANT_WRITE || err == SSL_ERROR_WANT_READ) {
|
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rv = NGHTTP2_ERR_WOULDBLOCK;
|
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} else {
|
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rv = NGHTTP2_ERR_CALLBACK_FAILURE;
|
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}
|
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} else if (rv == 0) {
|
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rv = NGHTTP2_ERR_EOF;
|
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}
|
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return rv;
|
||||
}
|
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|
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char *sh2lib_frame_type_str(int type)
|
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{
|
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switch (type) {
|
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case NGHTTP2_HEADERS:
|
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return "HEADERS";
|
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break;
|
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case NGHTTP2_RST_STREAM:
|
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return "RST_STREAM";
|
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break;
|
||||
case NGHTTP2_GOAWAY:
|
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return "GOAWAY";
|
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break;
|
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case NGHTTP2_DATA:
|
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return "DATA";
|
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break;
|
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case NGHTTP2_SETTINGS:
|
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return "SETTINGS";
|
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break;
|
||||
case NGHTTP2_PUSH_PROMISE:
|
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return "PUSH_PROMISE";
|
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break;
|
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case NGHTTP2_PING:
|
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return "PING";
|
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break;
|
||||
default:
|
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return "other";
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static int callback_on_frame_send(nghttp2_session *session,
|
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const nghttp2_frame *frame, void *user_data)
|
||||
{
|
||||
ESP_LOGD(TAG, "[frame-send] frame type %s", sh2lib_frame_type_str(frame->hd.type));
|
||||
switch (frame->hd.type) {
|
||||
case NGHTTP2_HEADERS:
|
||||
if (nghttp2_session_get_stream_user_data(session, frame->hd.stream_id)) {
|
||||
ESP_LOGD(TAG, "[frame-send] C ----------------------------> S (HEADERS)");
|
||||
#if DBG_FRAME_SEND
|
||||
ESP_LOGD(TAG, "[frame-send] headers nv-len = %d", frame->headers.nvlen);
|
||||
const nghttp2_nv *nva = frame->headers.nva;
|
||||
size_t i;
|
||||
for (i = 0; i < frame->headers.nvlen; ++i) {
|
||||
ESP_LOGD(TAG, "[frame-send] %s : %s", nva[i].name, nva[i].value);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
break;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int callback_on_frame_recv(nghttp2_session *session,
|
||||
const nghttp2_frame *frame, void *user_data)
|
||||
{
|
||||
ESP_LOGD(TAG, "[frame-recv][sid: %d] frame type %s", frame->hd.stream_id, sh2lib_frame_type_str(frame->hd.type));
|
||||
if (frame->hd.type != NGHTTP2_DATA) {
|
||||
return 0;
|
||||
}
|
||||
/* Subsequent processing only for data frame */
|
||||
sh2lib_frame_data_recv_cb_t data_recv_cb = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
|
||||
if (data_recv_cb) {
|
||||
struct sh2lib_handle *h2 = user_data;
|
||||
(*data_recv_cb)(h2, NULL, 0, DATA_RECV_FRAME_COMPLETE);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int callback_on_stream_close(nghttp2_session *session, int32_t stream_id,
|
||||
uint32_t error_code, void *user_data)
|
||||
{
|
||||
|
||||
ESP_LOGD(TAG, "[stream-close][sid %d]", stream_id);
|
||||
sh2lib_frame_data_recv_cb_t data_recv_cb = nghttp2_session_get_stream_user_data(session, stream_id);
|
||||
if (data_recv_cb) {
|
||||
struct sh2lib_handle *h2 = user_data;
|
||||
(*data_recv_cb)(h2, NULL, 0, DATA_RECV_RST_STREAM);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int callback_on_data_chunk_recv(nghttp2_session *session, uint8_t flags,
|
||||
int32_t stream_id, const uint8_t *data,
|
||||
size_t len, void *user_data)
|
||||
{
|
||||
sh2lib_frame_data_recv_cb_t data_recv_cb;
|
||||
ESP_LOGD(TAG, "[data-chunk][sid:%d]", stream_id);
|
||||
data_recv_cb = nghttp2_session_get_stream_user_data(session, stream_id);
|
||||
if (data_recv_cb) {
|
||||
ESP_LOGD(TAG, "[data-chunk] C <---------------------------- S (DATA chunk)"
|
||||
"%lu bytes",
|
||||
(unsigned long int)len);
|
||||
struct sh2lib_handle *h2 = user_data;
|
||||
(*data_recv_cb)(h2, (char *)data, len, 0);
|
||||
/* TODO: What to do with the return value: look for pause/abort */
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int callback_on_header(nghttp2_session *session, const nghttp2_frame *frame,
|
||||
const uint8_t *name, size_t namelen, const uint8_t *value,
|
||||
size_t valuelen, uint8_t flags, void *user_data)
|
||||
{
|
||||
ESP_LOGD(TAG, "[hdr-recv][sid:%d] %s : %s", frame->hd.stream_id, name, value);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int do_http2_connect(struct sh2lib_handle *hd)
|
||||
{
|
||||
int ret;
|
||||
nghttp2_session_callbacks *callbacks;
|
||||
nghttp2_session_callbacks_new(&callbacks);
|
||||
nghttp2_session_callbacks_set_send_callback(callbacks, callback_send);
|
||||
nghttp2_session_callbacks_set_recv_callback(callbacks, callback_recv);
|
||||
nghttp2_session_callbacks_set_on_frame_send_callback(callbacks, callback_on_frame_send);
|
||||
nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks, callback_on_frame_recv);
|
||||
nghttp2_session_callbacks_set_on_stream_close_callback(callbacks, callback_on_stream_close);
|
||||
nghttp2_session_callbacks_set_on_data_chunk_recv_callback(callbacks, callback_on_data_chunk_recv);
|
||||
nghttp2_session_callbacks_set_on_header_callback(callbacks, callback_on_header);
|
||||
ret = nghttp2_session_client_new(&hd->http2_sess, callbacks, hd);
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "[sh2-connect] New http2 session failed");
|
||||
nghttp2_session_callbacks_del(callbacks);
|
||||
return -1;
|
||||
}
|
||||
nghttp2_session_callbacks_del(callbacks);
|
||||
|
||||
/* Create the SETTINGS frame */
|
||||
ret = nghttp2_submit_settings(hd->http2_sess, NGHTTP2_FLAG_NONE, NULL, 0);
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "[sh2-connect] Submit settings failed");
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int sh2lib_connect(struct sh2lib_handle *hd, const char *uri)
|
||||
{
|
||||
memset(hd, 0, sizeof(*hd));
|
||||
|
||||
struct uri res;
|
||||
/* Parse the URI */
|
||||
if (parse_uri(&res, uri) != 0) {
|
||||
ESP_LOGE(TAG, "[sh2-connect] Failed to parse URI");
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* TCP connection with the server */
|
||||
int sockfd = connect_to_host(res.host, res.hostlen, res.port);
|
||||
if (sockfd < 0) {
|
||||
ESP_LOGE(TAG, "[sh2-connect] Failed to connect to %s", uri);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* SSL Connection on the socket */
|
||||
if (do_ssl_connect(hd, sockfd, res.host) != 0) {
|
||||
ESP_LOGE(TAG, "[sh2-connect] SSL Handshake failed with %s", uri);
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* HTTP/2 Connection */
|
||||
if (do_http2_connect(hd) != 0) {
|
||||
ESP_LOGE(TAG, "[sh2-connect] HTTP2 Connection failed with %s", uri);
|
||||
goto error;
|
||||
}
|
||||
|
||||
return 0;
|
||||
error:
|
||||
sh2lib_free(hd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
void sh2lib_free(struct sh2lib_handle *hd)
|
||||
{
|
||||
if (hd->http2_sess) {
|
||||
nghttp2_session_del(hd->http2_sess);
|
||||
hd->http2_sess = NULL;
|
||||
}
|
||||
if (hd->ssl) {
|
||||
SSL_free(hd->ssl);
|
||||
hd->ssl = NULL;
|
||||
}
|
||||
if (hd->ssl_ctx) {
|
||||
SSL_CTX_free(hd->ssl_ctx);
|
||||
hd->ssl_ctx = NULL;
|
||||
}
|
||||
if (hd->sockfd) {
|
||||
close(hd->sockfd);
|
||||
hd->ssl_ctx = 0;
|
||||
}
|
||||
}
|
||||
|
||||
int sh2lib_execute(struct sh2lib_handle *hd)
|
||||
{
|
||||
int ret;
|
||||
ret = nghttp2_session_send(hd->http2_sess);
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "[sh2-execute] HTTP2 session send failed %d", ret);
|
||||
return -1;
|
||||
}
|
||||
ret = nghttp2_session_recv(hd->http2_sess);
|
||||
if (ret != 0) {
|
||||
ESP_LOGE(TAG, "[sh2-execute] HTTP2 session recv failed %d", ret);
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
int ret = nghttp2_submit_request(hd->http2_sess, NULL, nva, nvlen, NULL, recv_cb);
|
||||
if (ret < 0) {
|
||||
ESP_LOGE(TAG, "[sh2-do-get] HEADERS call failed");
|
||||
return -1;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int sh2lib_do_get(struct sh2lib_handle *hd, const char *path, sh2lib_frame_data_recv_cb_t recv_cb)
|
||||
{
|
||||
#define HTTP2_PATH_NV ":path"
|
||||
const nghttp2_nv nva[] = { SH2LIB_MAKE_NV(":method", "GET"),
|
||||
SH2LIB_MAKE_NV(":scheme", "https"),
|
||||
{(uint8_t *)HTTP2_PATH_NV, (uint8_t *)path, strlen(HTTP2_PATH_NV), strlen(path), NGHTTP2_NV_FLAG_NONE},
|
||||
};
|
||||
return sh2lib_do_get_with_nv(hd, nva, sizeof(nva) / sizeof(nva[0]), recv_cb);
|
||||
}
|
||||
|
||||
ssize_t sh2lib_data_provider_cb(nghttp2_session *session, int32_t stream_id, uint8_t *buf,
|
||||
size_t length, uint32_t *data_flags,
|
||||
nghttp2_data_source *source, void *user_data)
|
||||
{
|
||||
struct sh2lib_handle *h2 = user_data;
|
||||
sh2lib_putpost_data_cb_t data_cb = source->ptr;
|
||||
return (*data_cb)(h2, (char *)buf, length, data_flags);
|
||||
}
|
||||
|
||||
int sh2lib_do_putpost_with_nv(struct sh2lib_handle *hd, const nghttp2_nv *nva, size_t nvlen,
|
||||
sh2lib_putpost_data_cb_t send_cb,
|
||||
sh2lib_frame_data_recv_cb_t recv_cb)
|
||||
{
|
||||
|
||||
nghttp2_data_provider sh2lib_data_provider;
|
||||
sh2lib_data_provider.read_callback = sh2lib_data_provider_cb;
|
||||
sh2lib_data_provider.source.ptr = send_cb;
|
||||
int ret = nghttp2_submit_request(hd->http2_sess, NULL, nva, nvlen, &sh2lib_data_provider, recv_cb);
|
||||
if (ret < 0) {
|
||||
ESP_LOGE(TAG, "[sh2-do-putpost] HEADERS call failed");
|
||||
return -1;
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int sh2lib_do_post(struct sh2lib_handle *hd, const char *path,
|
||||
sh2lib_putpost_data_cb_t send_cb,
|
||||
sh2lib_frame_data_recv_cb_t recv_cb)
|
||||
{
|
||||
const nghttp2_nv nva[] = { SH2LIB_MAKE_NV(":method", "POST"),
|
||||
SH2LIB_MAKE_NV(":scheme", "https"),
|
||||
SH2LIB_MAKE_NV(":path", path),
|
||||
};
|
||||
return sh2lib_do_putpost_with_nv(hd, nva, sizeof(nva) / sizeof(nva[0]), send_cb, recv_cb);
|
||||
}
|
||||
|
||||
int sh2lib_do_put(struct sh2lib_handle *hd, const char *path,
|
||||
sh2lib_putpost_data_cb_t send_cb,
|
||||
sh2lib_frame_data_recv_cb_t recv_cb)
|
||||
{
|
||||
const nghttp2_nv nva[] = { SH2LIB_MAKE_NV(":method", "PUT"),
|
||||
SH2LIB_MAKE_NV(":scheme", "https"),
|
||||
SH2LIB_MAKE_NV(":path", path),
|
||||
};
|
||||
return sh2lib_do_putpost_with_nv(hd, nva, sizeof(nva) / sizeof(nva[0]), send_cb, recv_cb);
|
||||
}
|
||||
|
||||
266
examples/protocols/http2_request/components/sh2lib/sh2lib.h
Normal file
266
examples/protocols/http2_request/components/sh2lib/sh2lib.h
Normal file
|
|
@ -0,0 +1,266 @@
|
|||
// Copyright 2017 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_EXAMPLE_SH2_LIB_H_
|
||||
#define __ESP_EXAMPLE_SH2_LIB_H_
|
||||
|
||||
#include <openssl/ssl.h>
|
||||
#include <nghttp2/nghttp2.h>
|
||||
|
||||
/*
|
||||
* This is a thin API wrapper over nghttp2 that offers simplified APIs for usage
|
||||
* in the application. The intention of this wrapper is to act as a stepping
|
||||
* stone to quickly get started with using the HTTP/2 client. Since the focus is
|
||||
* on simplicity, not all the features of HTTP/2 are supported through this
|
||||
* wrapper. Once you are fairly comfortable with nghttp2, feel free to directly
|
||||
* use nghttp2 APIs or make changes to sh2lib.c for realising your objectives.
|
||||
*
|
||||
* TODO:
|
||||
* - Allowing to query response code, content-type etc in the receive callback
|
||||
* - A simple function for per-stream header callback
|
||||
*/
|
||||
/**
|
||||
* @brief Handle for working with sh2lib APIs
|
||||
*/
|
||||
struct sh2lib_handle {
|
||||
/* Ideally, CTX is per-program, so we could potentially take it out of this
|
||||
* per-connection structure
|
||||
*/
|
||||
SSL_CTX *ssl_ctx; /*!< Pointer to the SSL context */
|
||||
SSL *ssl; /*!< Pointer to the SSL handle */
|
||||
nghttp2_session *http2_sess; /*!< Pointer to the HTTP2 session handle */
|
||||
int sockfd; /*!< Socket file descriptor */
|
||||
};
|
||||
|
||||
/** Flag indicating receive stream is reset */
|
||||
#define DATA_RECV_RST_STREAM 1
|
||||
/** Flag indicating frame is completely received */
|
||||
#define DATA_RECV_FRAME_COMPLETE 2
|
||||
|
||||
/**
|
||||
* @brief Function Prototype for data receive callback
|
||||
*
|
||||
* This function gets called whenever data is received on any stream. The
|
||||
* function is also called for indicating events like frame receive complete, or
|
||||
* end of stream. The function may get called multiple times as long as data is
|
||||
* received on the stream.
|
||||
*
|
||||
* @param[in] handle Pointer to the sh2lib handle.
|
||||
* @param[in] data Pointer to a buffer that contains the data received.
|
||||
* @param[in] len The length of valid data stored at the 'data' pointer.
|
||||
* @param[in] flags Flags indicating whether the stream is reset (DATA_RECV_RST_STREAM) or
|
||||
* this particularly frame is completely received
|
||||
* DATA_RECV_FRAME_COMPLETE).
|
||||
*
|
||||
* @return The function should return 0
|
||||
*/
|
||||
typedef int (*sh2lib_frame_data_recv_cb_t)(struct sh2lib_handle *handle, const char *data, size_t len, int flags);
|
||||
|
||||
/**
|
||||
* @brief Function Prototype for callback to send data in PUT/POST
|
||||
*
|
||||
* This function gets called whenever nghttp2 wishes to send data, like for
|
||||
* PUT/POST requests to the server. The function keeps getting called until this
|
||||
* function sets the flag NGHTTP2_DATA_FLAG_EOF to indicate end of data.
|
||||
*
|
||||
* @param[in] handle Pointer to the sh2lib handle.
|
||||
* @param[out] data Pointer to a buffer that should contain the data to send.
|
||||
* @param[in] len The maximum length of data that can be sent out by this function.
|
||||
* @param[out] data_flags Pointer to the data flags. The NGHTTP2_DATA_FLAG_EOF
|
||||
* should be set in the data flags to indicate end of new data.
|
||||
*
|
||||
* @return The function should return the number of valid bytes stored in the
|
||||
* data pointer
|
||||
*/
|
||||
typedef int (*sh2lib_putpost_data_cb_t)(struct sh2lib_handle *handle, char *data, size_t len, uint32_t *data_flags);
|
||||
|
||||
/**
|
||||
* @brief Connect to a URI using HTTP/2
|
||||
*
|
||||
* This API opens an HTTP/2 connection with the provided URI. If successful, the
|
||||
* hd pointer is populated with a valid handle for subsequent communication.
|
||||
*
|
||||
* Only 'https' URIs are supported.
|
||||
*
|
||||
* @param[out] hd Pointer to a variable of the type 'struct sh2lib_handle'.
|
||||
* @param[in] uri Pointer to the URI that should be connected to.
|
||||
*
|
||||
* @return
|
||||
* - ESP_OK if the connection was successful
|
||||
* - ESP_FAIL if the connection fails
|
||||
*/
|
||||
int sh2lib_connect(struct sh2lib_handle *hd, const char *uri);
|
||||
|
||||
/**
|
||||
* @brief Free a sh2lib handle
|
||||
*
|
||||
* This API frees-up an sh2lib handle, thus closing any open connections that
|
||||
* may be associated with this handle, and freeing up any resources.
|
||||
*
|
||||
* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
|
||||
*
|
||||
*/
|
||||
void sh2lib_free(struct sh2lib_handle *hd);
|
||||
|
||||
/**
|
||||
* @brief Setup an HTTP GET request stream
|
||||
*
|
||||
* This API sets up an HTTP GET request to be sent out to the server. A new
|
||||
* stream is created for handling the request. Once the request is setup, the
|
||||
* API sh2lib_execute() must be called to actually perform the socket I/O with
|
||||
* the server.
|
||||
*
|
||||
* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
|
||||
* @param[in] path Pointer to the string that contains the resource to
|
||||
* perform the HTTP GET operation on (for example, /users).
|
||||
* @param[in] recv_cb The callback function that should be called for
|
||||
* processing the request's response
|
||||
*
|
||||
* @return
|
||||
* - ESP_OK if request setup is successful
|
||||
* - ESP_FAIL if the request setup fails
|
||||
*/
|
||||
int sh2lib_do_get(struct sh2lib_handle *hd, const char *path, sh2lib_frame_data_recv_cb_t recv_cb);
|
||||
|
||||
/**
|
||||
* @brief Setup an HTTP POST request stream
|
||||
*
|
||||
* This API sets up an HTTP POST request to be sent out to the server. A new
|
||||
* stream is created for handling the request. Once the request is setup, the
|
||||
* API sh2lib_execute() must be called to actually perform the socket I/O with
|
||||
* the server.
|
||||
*
|
||||
* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
|
||||
* @param[in] path Pointer to the string that contains the resource to
|
||||
* perform the HTTP POST operation on (for example, /users).
|
||||
* @param[in] send_cb The callback function that should be called for
|
||||
* sending data as part of this request.
|
||||
* @param[in] recv_cb The callback function that should be called for
|
||||
* processing the request's response
|
||||
*
|
||||
* @return
|
||||
* - ESP_OK if request setup is successful
|
||||
* - ESP_FAIL if the request setup fails
|
||||
*/
|
||||
int sh2lib_do_post(struct sh2lib_handle *hd, const char *path,
|
||||
sh2lib_putpost_data_cb_t send_cb,
|
||||
sh2lib_frame_data_recv_cb_t recv_cb);
|
||||
|
||||
/**
|
||||
* @brief Setup an HTTP PUT request stream
|
||||
*
|
||||
* This API sets up an HTTP PUT request to be sent out to the server. A new
|
||||
* stream is created for handling the request. Once the request is setup, the
|
||||
* API sh2lib_execute() must be called to actually perform the socket I/O with
|
||||
* the server.
|
||||
*
|
||||
* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
|
||||
* @param[in] path Pointer to the string that contains the resource to
|
||||
* perform the HTTP PUT operation on (for example, /users).
|
||||
* @param[in] send_cb The callback function that should be called for
|
||||
* sending data as part of this request.
|
||||
* @param[in] recv_cb The callback function that should be called for
|
||||
* processing the request's response
|
||||
*
|
||||
* @return
|
||||
* - ESP_OK if request setup is successful
|
||||
* - ESP_FAIL if the request setup fails
|
||||
*/
|
||||
int sh2lib_do_put(struct sh2lib_handle *hd, const char *path,
|
||||
sh2lib_putpost_data_cb_t send_cb,
|
||||
sh2lib_frame_data_recv_cb_t recv_cb);
|
||||
|
||||
/**
|
||||
* @brief Execute send/receive on an HTTP/2 connection
|
||||
*
|
||||
* While the API sh2lib_do_get(), sh2lib_do_post() setup the requests to be
|
||||
* initiated with the server, this API performs the actual data send/receive
|
||||
* operations on the HTTP/2 connection. The callback functions are accordingly
|
||||
* called during the processing of these requests.
|
||||
*
|
||||
* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'
|
||||
*
|
||||
* @return
|
||||
* - ESP_OK if the connection was successful
|
||||
* - ESP_FAIL if the connection fails
|
||||
*/
|
||||
int sh2lib_execute(struct sh2lib_handle *hd);
|
||||
|
||||
#define SH2LIB_MAKE_NV(NAME, VALUE) \
|
||||
{ \
|
||||
(uint8_t *)NAME, (uint8_t *)VALUE, strlen(NAME), strlen(VALUE), \
|
||||
NGHTTP2_NV_FLAG_NONE \
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief Setup an HTTP GET request stream with custom name-value pairs
|
||||
*
|
||||
* For a simpler version of the API, please refer to sh2lib_do_get().
|
||||
*
|
||||
* This API sets up an HTTP GET request to be sent out to the server. A new
|
||||
* stream is created for handling the request. Once the request is setup, the
|
||||
* API sh2lib_execute() must be called to actually perform the socket I/O with
|
||||
* the server.
|
||||
*
|
||||
* Please note that the following name value pairs MUST be a part of the request
|
||||
* - name:value
|
||||
* - ":method":"GET"
|
||||
* - ":scheme":"https"
|
||||
* - ":path":<the-path-for-the-GET-operation> (for example, /users)
|
||||
*
|
||||
* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
|
||||
* @param[in] nva An array of name-value pairs that should be part of the request.
|
||||
* @param[in] nvlen The number of elements in the array pointed to by 'nva'.
|
||||
* @param[in] recv_cb The callback function that should be called for
|
||||
* processing the request's response
|
||||
*
|
||||
* @return
|
||||
* - ESP_OK if request setup is successful
|
||||
* - ESP_FAIL if the request setup fails
|
||||
*/
|
||||
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);
|
||||
|
||||
/**
|
||||
* @brief Setup an HTTP PUT/POST request stream with custom name-value pairs
|
||||
*
|
||||
* For a simpler version of the API, please refer to sh2lib_do_put() or
|
||||
* sh2lib_do_post().
|
||||
*
|
||||
* This API sets up an HTTP PUT/POST request to be sent out to the server. A new
|
||||
* stream is created for handling the request. Once the request is setup, the
|
||||
* API sh2lib_execute() must be called to actually perform the socket I/O with
|
||||
* the server.
|
||||
*
|
||||
* Please note that the following name value pairs MUST be a part of the request
|
||||
* - name:value
|
||||
* - ":method":"PUT" (or POST)
|
||||
* - ":scheme":"https"
|
||||
* - ":path":<the-path-for-the-PUT-operation> (for example, /users)
|
||||
*
|
||||
* @param[in] hd Pointer to a variable of the type 'struct sh2lib_handle'.
|
||||
* @param[in] nva An array of name-value pairs that should be part of the request.
|
||||
* @param[in] nvlen The number of elements in the array pointed to by 'nva'.
|
||||
* @param[in] send_cb The callback function that should be called for
|
||||
* sending data as part of this request.
|
||||
* @param[in] recv_cb The callback function that should be called for
|
||||
* processing the request's response
|
||||
*
|
||||
* @return
|
||||
* - ESP_OK if request setup is successful
|
||||
* - ESP_FAIL if the request setup fails
|
||||
*/
|
||||
int sh2lib_do_putpost_with_nv(struct sh2lib_handle *hd, const nghttp2_nv *nva, size_t nvlen,
|
||||
sh2lib_putpost_data_cb_t send_cb,
|
||||
sh2lib_frame_data_recv_cb_t recv_cb);
|
||||
|
||||
#endif /* ! __ESP_EXAMPLE_SH2_LIB_H_ */
|
||||
17
examples/protocols/http2_request/main/Kconfig.projbuild
Normal file
17
examples/protocols/http2_request/main/Kconfig.projbuild
Normal file
|
|
@ -0,0 +1,17 @@
|
|||
menu "Example Configuration"
|
||||
|
||||
config WIFI_SSID
|
||||
string "WiFi SSID"
|
||||
default "myssid"
|
||||
help
|
||||
SSID (network name) for the example to connect to.
|
||||
|
||||
config WIFI_PASSWORD
|
||||
string "WiFi Password"
|
||||
default "myssid"
|
||||
help
|
||||
WiFi password (WPA or WPA2) for the example to use.
|
||||
|
||||
Can be left blank if the network has no security set.
|
||||
|
||||
endmenu
|
||||
0
examples/protocols/http2_request/main/component.mk
Normal file
0
examples/protocols/http2_request/main/component.mk
Normal file
|
|
@ -0,0 +1,199 @@
|
|||
/* HTTP2 GET Example using nghttp2
|
||||
|
||||
Contacts http2.golang.org and executes the GET/PUT requests. A thin API
|
||||
wrapper on top of nghttp2, to properly demonstrate the interactions.
|
||||
|
||||
This example code is in the Public Domain (or CC0 licensed, at your option.)
|
||||
|
||||
Unless required by applicable law or agreed to in writing, this
|
||||
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
||||
CONDITIONS OF ANY KIND, either express or implied.
|
||||
|
||||
*/
|
||||
#include <string.h>
|
||||
#include <stdlib.h>
|
||||
#include <sys/time.h>
|
||||
#include "freertos/FreeRTOS.h"
|
||||
#include "freertos/task.h"
|
||||
#include "freertos/event_groups.h"
|
||||
#include "esp_wifi.h"
|
||||
#include "esp_event_loop.h"
|
||||
#include "apps/sntp/sntp.h"
|
||||
#include "esp_log.h"
|
||||
#include "esp_system.h"
|
||||
#include "nvs_flash.h"
|
||||
|
||||
#include "sh2lib.h"
|
||||
|
||||
/* The examples use simple WiFi configuration that you can set via
|
||||
'make menuconfig'.
|
||||
|
||||
If you'd rather not, just change the below entries to strings with
|
||||
the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
|
||||
*/
|
||||
#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
|
||||
#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
|
||||
|
||||
/* FreeRTOS event group to signal when we are connected & ready to make a request */
|
||||
static EventGroupHandle_t wifi_event_group;
|
||||
|
||||
/* The event group allows multiple bits for each event,
|
||||
but we only care about one event - are we connected
|
||||
to the AP with an IP? */
|
||||
const int CONNECTED_BIT = BIT0;
|
||||
|
||||
static const char *TAG = "http2-req";
|
||||
|
||||
/* The HTTP/2 server to connect to */
|
||||
#define HTTP2_SERVER_URI "https://http2.golang.org"
|
||||
/* A GET request that keeps streaming current time every second */
|
||||
#define HTTP2_STREAMING_GET_PATH "/clockstream"
|
||||
/* A PUT request that echoes whatever we had sent to it */
|
||||
#define HTTP2_PUT_PATH "/ECHO"
|
||||
|
||||
int handle_get_response(struct sh2lib_handle *handle, const char *data, size_t len, int flags)
|
||||
{
|
||||
if (len) {
|
||||
printf("[get-response] %.*s\n", len, data);
|
||||
}
|
||||
if (flags == DATA_RECV_FRAME_COMPLETE) {
|
||||
printf("[get-response] Frame fully received\n");
|
||||
}
|
||||
if (flags == DATA_RECV_RST_STREAM) {
|
||||
printf("[get-response] Stream Closed\n");
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int handle_echo_response(struct sh2lib_handle *handle, const char *data, size_t len, int flags)
|
||||
{
|
||||
if (len) {
|
||||
printf("[echo-response] %.*s\n", len, data);
|
||||
}
|
||||
if (flags == DATA_RECV_FRAME_COMPLETE) {
|
||||
printf("[echo-response] Frame fully received\n");
|
||||
}
|
||||
if (flags == DATA_RECV_RST_STREAM) {
|
||||
printf("[echo-response] Stream Closed\n");
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int send_put_data(struct sh2lib_handle *handle, char *buf, size_t length, uint32_t *data_flags)
|
||||
{
|
||||
#define DATA_TO_SEND "Hello World"
|
||||
int copylen = strlen(DATA_TO_SEND);
|
||||
if (copylen < length) {
|
||||
printf("[data-prvd] Sending %d bytes\n", copylen);
|
||||
memcpy(buf, DATA_TO_SEND, copylen);
|
||||
} else {
|
||||
copylen = 0;
|
||||
}
|
||||
|
||||
(*data_flags) |= NGHTTP2_DATA_FLAG_EOF;
|
||||
return copylen;
|
||||
}
|
||||
|
||||
static void set_time(void)
|
||||
{
|
||||
struct timeval tv = {
|
||||
.tv_sec = 1509449941,
|
||||
};
|
||||
struct timezone tz = {
|
||||
0, 0
|
||||
};
|
||||
settimeofday(&tv, &tz);
|
||||
|
||||
/* Start SNTP service */
|
||||
sntp_setoperatingmode(SNTP_OPMODE_POLL);
|
||||
sntp_init();
|
||||
}
|
||||
|
||||
static void http2_task(void *args)
|
||||
{
|
||||
/* Waiting for connection */
|
||||
xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
|
||||
false, true, portMAX_DELAY);
|
||||
|
||||
/* Set current time: proper system time is required for TLS based
|
||||
* certificate verification.
|
||||
*/
|
||||
set_time();
|
||||
|
||||
/* HTTP2: one connection multiple requests. Do the TLS/TCP connection first */
|
||||
printf("Connecting to server\n");
|
||||
struct sh2lib_handle hd;
|
||||
if (sh2lib_connect(&hd, HTTP2_SERVER_URI) != 0) {
|
||||
printf("Failed to connect\n");
|
||||
return;
|
||||
}
|
||||
printf("Connection done\n");
|
||||
|
||||
/* HTTP GET */
|
||||
sh2lib_do_get(&hd, HTTP2_STREAMING_GET_PATH, handle_get_response);
|
||||
|
||||
/* HTTP PUT */
|
||||
sh2lib_do_put(&hd, HTTP2_PUT_PATH, send_put_data, handle_echo_response);
|
||||
|
||||
while (1) {
|
||||
/* Process HTTP2 send/receive */
|
||||
if (sh2lib_execute(&hd) < 0) {
|
||||
printf("Error in send/receive\n");
|
||||
break;
|
||||
}
|
||||
vTaskDelay(2);
|
||||
}
|
||||
|
||||
sh2lib_free(&hd);
|
||||
}
|
||||
|
||||
static esp_err_t event_handler(void *ctx, system_event_t *event)
|
||||
{
|
||||
switch (event->event_id) {
|
||||
case SYSTEM_EVENT_STA_START:
|
||||
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
|
||||
ESP_ERROR_CHECK(esp_wifi_connect());
|
||||
break;
|
||||
case SYSTEM_EVENT_STA_GOT_IP:
|
||||
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
|
||||
ESP_LOGI(TAG, "got ip:%s\n", ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
|
||||
xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
|
||||
break;
|
||||
case SYSTEM_EVENT_STA_DISCONNECTED:
|
||||
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_DISCONNECTED");
|
||||
ESP_ERROR_CHECK(esp_wifi_connect());
|
||||
xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return ESP_OK;
|
||||
}
|
||||
|
||||
static void initialise_wifi(void)
|
||||
{
|
||||
tcpip_adapter_init();
|
||||
wifi_event_group = xEventGroupCreate();
|
||||
ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
|
||||
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
|
||||
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
|
||||
ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
|
||||
wifi_config_t wifi_config = {
|
||||
.sta = {
|
||||
.ssid = EXAMPLE_WIFI_SSID,
|
||||
.password = EXAMPLE_WIFI_PASS,
|
||||
},
|
||||
};
|
||||
ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
|
||||
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
|
||||
ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
|
||||
ESP_ERROR_CHECK( esp_wifi_start() );
|
||||
}
|
||||
|
||||
void app_main()
|
||||
{
|
||||
ESP_ERROR_CHECK( nvs_flash_init() );
|
||||
initialise_wifi();
|
||||
|
||||
xTaskCreate(&http2_task, "http2_task", (1024 * 32), NULL, 5, NULL);
|
||||
}
|
||||
Loading…
Reference in a new issue