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Commit fc44658b authored by Ivan Grokhotkov's avatar Ivan Grokhotkov
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
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To do so, attach the following notices to the program. It is safest
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<one line to give the program's name and a brief idea of what it does.>
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Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
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This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
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The hypothetical commands `show w' and `show c' should show the appropriate
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You should also get your employer (if you work as a programmer) or school,
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For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
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Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
README.md 0 → 100644
View file @ fc44658b
Simple HTTP server
------------------
This is a very minimal HTTP server I use in some of the projects.
Absolutely not ready for any kind of production use.
How to use
----------
Really, please see above note.
This directory is an ESP-IDF component. Clone it (or add it as a submodule) into the component directory of the project.
Documentation
-------------
None yet, but I tried to make the comments in the header file helpful.
Example
-------
None yet.
Debugging
---------
Increasing log level to "Verbose" should produce lots of output related to request handling.
License
-------
GPL, see [LICENSE](LICENSE) file. Mostly because this is a very early version. Will be relicensed as something more reasonable later.
component.mk 0 → 100644
View file @ fc44658b
COMPONENT_ADD_INCLUDEDIRS := .
http_server.c 0 → 100644
View file @ fc44658b
/* Simple HTTP server for ESP32.
* Copyright Ivan Grokhotkov, 2017.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/lock.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "rom/queue.h"
#include "esp_log.h"
#include "lwip/sys.h"
#include "lwip/netdb.h"
#include "lwip/api.h"
#include "http_parser.h"
#include "http_server.h"
#define HTTP_PARSE_BUF_MAX_LEN 256
typedef enum {
HTTP_PARSING_URI, //!< HTTP_PARSING_URI
HTTP_PARSING_HEADER_NAME, //!< HTTP_PARSING_HEADER_NAME
HTTP_PARSING_HEADER_VALUE, //!< HTTP_PARSING_HEADER_VALUE
HTTP_PARSING_REQUEST_BODY, //!< HTTP_PARSING_REQUEST_BODY
HTTP_REQUEST_DONE, //!< HTTP_REQUEST_DONE
HTTP_COLLECTING_RESPONSE_HEADERS,//!< HTTP_COLLECTING_RESPONSE_HEADERS
HTTP_SENDING_RESPONSE_BODY, //!< HTTP_SENDING_RESPONSE_BODY
HTTP_DONE, //!< HTTP_DONE
} http_state_t;
typedef struct http_header_t {
char* name;
char* value;
SLIST_ENTRY(http_header_t) list_entry;
} http_header_t;
typedef SLIST_HEAD(http_header_list_t, http_header_t) http_header_list_t;
typedef struct {
http_handler_fn_t cb;
void* ctx;
} http_form_handler_t;
typedef struct http_handler_t{
char* uri_pattern;
int method;
int events;
http_handler_fn_t cb;
void* ctx;
SLIST_ENTRY(http_handler_t) list_entry;
} http_handler_t;
struct http_context_ {
http_server_t server;
http_state_t state;
int event;
char* uri;
char parse_buffer[HTTP_PARSE_BUF_MAX_LEN];
char* request_header_tmp;
struct netconn *conn;
http_parser parser;
http_header_list_t request_headers;
int response_code;
http_header_list_t response_headers;
size_t expected_response_size;
size_t accumulated_response_size;
http_handler_t* handler;
const char* data_ptr;
size_t data_size;
http_header_list_t request_args;
};
struct http_server_context_ {
int port;
err_t server_task_err;
struct netconn* server_conn;
TaskHandle_t task;
EventGroupHandle_t start_done;
SLIST_HEAD(, http_handler_t) handlers;
_lock_t handlers_lock;
struct http_context_ connection_context;
};
#define SERVER_STARTED_BIT BIT(0)
#define SERVER_DONE_BIT BIT(1)
static const char* http_response_code_to_str(int code);
static esp_err_t add_keyval_pair(http_header_list_t *list, const char* name, const char* val);
static const char* TAG = "http_server";
esp_err_t http_register_handler(http_server_t server,
const char* uri_pattern, int method,
int events, http_handler_fn_t callback, void* callback_arg)
{
http_handler_t* new_handler = (http_handler_t*) calloc(1, sizeof(*new_handler));
if (new_handler == NULL) {
return ESP_ERR_NO_MEM;
}
new_handler->uri_pattern = strdup(uri_pattern);
new_handler->cb = callback;
new_handler->ctx = callback_arg;
new_handler->method = method;
new_handler->events = events;
_lock_acquire(&server->handlers_lock);
/* FIXME: Handlers will be checked in the reverse order */
SLIST_INSERT_HEAD(&server->handlers, new_handler, list_entry);
_lock_release(&server->handlers_lock);
return ESP_OK;
}
static http_handler_t* http_find_handler(http_server_t server, const char* uri, int method)
{
http_handler_t* it;
_lock_acquire(&server->handlers_lock);
SLIST_FOREACH(it, &server->handlers, list_entry) {
if (strcasecmp(uri, it->uri_pattern) == 0
&& method == it->method) {
break;
}
}
_lock_release(&server->handlers_lock);
return it;
}
static int append_parse_buffer(http_context_t ctx, const char* at, size_t length)
{
if (length > HTTP_PARSE_BUF_MAX_LEN - strlen(ctx->parse_buffer) - 1) {
ESP_LOGW(TAG, "%s: len=%d > %d", __func__, length, HTTP_PARSE_BUF_MAX_LEN - strlen(ctx->parse_buffer) - 1);
return 1;
}
strncat(ctx->parse_buffer, at, length);
ESP_LOGV(TAG, "%s: len=%d, '%s'", __func__, length, ctx->parse_buffer);
return 0;
}
static void clear_parse_buffer(http_context_t ctx)
{
#ifdef NDEBUG
ctx->parse_buffer[0] = 0;
#else
memset(ctx->parse_buffer, 0, sizeof(ctx->parse_buffer));
#endif
}
static void header_name_done(http_context_t ctx)
{
ctx->request_header_tmp = strdup(ctx->parse_buffer);
clear_parse_buffer(ctx);
}
static void header_value_done(http_context_t ctx)
{
const char* value = ctx->parse_buffer;
const char* name = ctx->request_header_tmp;
ESP_LOGD(TAG, "Got header: '%s': '%s'", name, value);
add_keyval_pair(&ctx->request_headers, name, value);
free(ctx->request_header_tmp);
ctx->request_header_tmp = NULL;
clear_parse_buffer(ctx);
}
static int http_url_cb(http_parser* parser, const char *at, size_t length)
{
http_context_t ctx = (http_context_t) parser->data;
return append_parse_buffer(ctx, at, length);
}
static bool invoke_handler(http_context_t ctx, int event)
{
if (ctx->handler && (ctx->handler->events & event) != 0) {
ctx->event = event;
(*ctx->handler->cb)(ctx, ctx->handler->ctx);
ctx->event = 0;
return true;
}
return false;
}
static int http_headers_done_cb(http_parser* parser)
{
http_context_t ctx = (http_context_t) parser->data;
if (ctx->state == HTTP_PARSING_HEADER_VALUE) {
header_value_done(ctx);
}
invoke_handler(ctx, HTTP_HANDLE_HEADERS);
ctx->state = HTTP_PARSING_REQUEST_BODY;
return 0;
}
static int parse_hex_digit(char hex)
{
switch (hex) {
case '0' ... '9': return hex - '0';
case 'a' ... 'f': return hex - 'a' + 0xa;
case 'A' ... 'F': return hex - 'A' + 0xA;
default:
return -1;
}
}
static char* urldecode(const char* str, size_t len)
{
ESP_LOGV(TAG, "urldecode: '%.*s'", len, str);
const char* end = str + len;
char* out = calloc(1, len + 1);
char* p_out = out;
while (str != end) {
char c = *str++;
if (c != '%') {
*p_out = c;
} else {
if (str + 2 > end) {
/* Unexpected end of string */
return NULL;
}
int high = parse_hex_digit(*str++);
int low = parse_hex_digit(*str++);
if (high == -1 || low == -1) {
/* Unexpected character */
return NULL;
}
*p_out = high * 16 + low;
}
++p_out;
}
*p_out = 0;
ESP_LOGV(TAG, "urldecode result: '%s'", out);
return out;
}
static void parse_urlencoded_args(http_context_t ctx, const char* str, size_t len)
{
const char* end = str + len;
const int READING_KEY = 1;
const int READING_VAL = 2;
int state = READING_KEY;
const char* token_start = str;
char* key = NULL;
char* value = NULL;
for (const char* pos = str; pos < end; ++pos) {
char c = *pos;
if (c == '=' && state == READING_KEY) {
key = urldecode(token_start, pos - token_start);
state = READING_VAL;
token_start = pos + 1;
} else if (c == '&' && state == READING_VAL) {
value = urldecode(token_start, pos - token_start);
state = READING_KEY;
token_start = pos + 1;
ESP_LOGD(TAG, "Got request argument, '%s': '%s'", key, value);
add_keyval_pair(&ctx->request_args, key, value);
free(key);
key = NULL;
free(value);
value = NULL;
}
}
if (state == READING_VAL) {
value = urldecode(token_start, end - token_start);
ESP_LOGD(TAG, "Got request argument, '%s': '%s'", key, value);
add_keyval_pair(&ctx->request_args, key, value);
free(key);
key = NULL;
free(value);
value = NULL;
}
}
static void uri_done(http_context_t ctx)
{
/* Check for query argument string */
char* query_str = strchr(ctx->parse_buffer, '?');
if (query_str != NULL) {
*query_str = 0;
++query_str;
}
ctx->uri = strdup(ctx->parse_buffer);
ESP_LOGD(TAG, "Got URI: '%s'", ctx->uri);
if (query_str) {
parse_urlencoded_args(ctx, query_str, strlen(query_str));
}
ctx->handler = http_find_handler(ctx->server, ctx->uri, (int) ctx->parser.method);
invoke_handler(ctx, HTTP_HANDLE_URI);
clear_parse_buffer(ctx);
}
static int http_header_name_cb(http_parser* parser, const char *at, size_t length)
{
ESP_LOGV(TAG, "%s", __func__);
http_context_t ctx = (http_context_t) parser->data;
if (ctx->state == HTTP_PARSING_URI) {
uri_done(ctx);
ctx->state = HTTP_PARSING_HEADER_NAME;
} else if (ctx->state == HTTP_PARSING_HEADER_VALUE) {
header_value_done(ctx);
ctx->state = HTTP_PARSING_HEADER_NAME;
}
return append_parse_buffer(ctx, at, length);
}
static int http_header_value_cb(http_parser* parser, const char *at, size_t length)
{
ESP_LOGV(TAG, "%s", __func__);
http_context_t ctx = (http_context_t) parser->data;
if (ctx->state == HTTP_PARSING_HEADER_NAME) {
header_name_done(ctx);
ctx->state = HTTP_PARSING_HEADER_VALUE;
}
return append_parse_buffer(ctx, at, length);
}
static int http_body_cb(http_parser* parser, const char *at, size_t length)
{
ESP_LOGV(TAG, "%s", __func__);
http_context_t ctx = (http_context_t) parser->data;
ctx->data_ptr = at;
ctx->data_size = length;
invoke_handler(ctx, HTTP_HANDLE_DATA);
ctx->data_ptr = NULL;
ctx->data_size = 0;
return 0;
}
static int http_message_done_cb(http_parser* parser)
{
ESP_LOGV(TAG, "%s", __func__);
http_context_t ctx = (http_context_t) parser->data;
ctx->state = HTTP_REQUEST_DONE;
return 0;
}
const char* http_request_get_header(http_context_t ctx, const char* name)
{
http_header_t* it;
SLIST_FOREACH(it, &ctx->request_headers, list_entry) {
if (strcasecmp(name, it->name) == 0) {
return it->value;
}
}
return NULL;
}
int http_request_get_event(http_context_t ctx)
{
return ctx->event;
}
const char* http_request_get_uri(http_context_t ctx)
{
return ctx->uri;
}
int http_request_get_method(http_context_t ctx)
{
return (int) ctx->parser.method;
}
esp_err_t http_request_get_data(http_context_t ctx, const char** out_data_ptr, size_t* out_size)
{
if (ctx->event != HTTP_HANDLE_DATA) {
return ESP_ERR_INVALID_STATE;
}
*out_data_ptr = ctx->data_ptr;
*out_size = ctx->data_size;
return ESP_OK;
}
static void form_data_handler_cb(http_context_t http_ctx, void* ctx)
{
http_form_handler_t* form_ctx = (http_form_handler_t*) ctx;
int event = http_request_get_event(http_ctx);
if (event != HTTP_HANDLE_DATA) {
(*form_ctx->cb)(http_ctx, form_ctx->ctx);
} else {
const char* str;
size_t len;
http_request_get_data(http_ctx, &str, &len);
parse_urlencoded_args(ctx, str, len);
}
}
esp_err_t http_register_form_handler(http_server_t server, const char* uri_pattern, int method,
int events, http_handler_fn_t callback, void* callback_arg)
{
http_form_handler_t* inner_handler = calloc(1, sizeof(*inner_handler));
if (inner_handler == NULL) {
return ESP_ERR_NO_MEM;
}
inner_handler->cb = callback;
inner_handler->ctx = callback_arg;
esp_err_t res = http_register_handler(server, uri_pattern, method,
events | HTTP_HANDLE_DATA, &form_data_handler_cb, inner_handler);
if (res != ESP_OK) {
free(inner_handler);
}
return res;
}
static esp_err_t lwip_err_to_esp_err(err_t e)
{
switch (e) {
case ERR_OK: return ESP_OK;
case ERR_MEM: return ESP_ERR_NO_MEM;
case ERR_TIMEOUT: return ESP_ERR_TIMEOUT;
default:
return ESP_FAIL;
}
}
static void headers_list_clear(http_header_list_t* list)
{
http_header_t *it, *next;
SLIST_FOREACH_SAFE(it, list, list_entry, next) {
SLIST_REMOVE(list, it, http_header_t, list_entry);
free(it); /* frees memory allocated for header, name, and value */
}
}
static esp_err_t http_add_content_length_header(http_context_t http_ctx, size_t value)
{
char size_str[11];
itoa(value, size_str, 10);
return http_response_set_header(http_ctx, "Content-length", size_str);
}
static esp_err_t http_send_response_headers(http_context_t http_ctx)
{
assert(http_ctx->state == HTTP_COLLECTING_RESPONSE_HEADERS);
/* Calculate total size of all the headers, allocate a buffer */
size_t total_headers_size = 0;
/* response_code may be == 0, if we are sending headers for multipart
* response part. In this case, don't send the response code line.
*/
if (http_ctx->response_code > 0) {
total_headers_size += 16 /* HTTP/1.1, code, CRLF */
+ strlen(http_response_code_to_str(http_ctx->response_code));
}
http_header_t* it;
SLIST_FOREACH(it, &http_ctx->response_headers, list_entry) {
total_headers_size += strlen(it->name) + strlen(it->value) + 4 /* ": ", CRLF */;
}
total_headers_size += 3; /* Final CRLF, '\0' terminator */
char* headers_buf = calloc(1, total_headers_size);
if (headers_buf == NULL) {
return ESP_ERR_NO_MEM;
}
/* Write response */
size_t buf_size = total_headers_size;
char* buf_ptr = headers_buf;
int len;
if (http_ctx->response_code > 0) {
len = snprintf(buf_ptr, buf_size, "HTTP/1.1 %d %s\r\n",
http_ctx->response_code, http_response_code_to_str(http_ctx->response_code));
assert(len < buf_size);
buf_size -= len;
buf_ptr += len;
}
/* Write response headers */
SLIST_FOREACH(it, &http_ctx->response_headers, list_entry) {
len = snprintf(buf_ptr, buf_size, "%s: %s\r\n", it->name, it->value);
assert(len < buf_size);
buf_size -= len;
buf_ptr += len;
}
/* Final CRLF */
len = snprintf(buf_ptr, buf_size, "\r\n");
assert(len < buf_size);
buf_size -= len;
buf_ptr += len;
headers_list_clear(&http_ctx->response_headers);
err_t err = netconn_write(http_ctx->conn, headers_buf, strlen(headers_buf), NETCONN_COPY);
free(headers_buf);
http_ctx->state = HTTP_SENDING_RESPONSE_BODY;
return lwip_err_to_esp_err(err);
}
/* Common function called by http_response_begin and http_response_begin_multipart */
static esp_err_t http_response_begin_common(http_context_t http_ctx, const char* content_type, size_t response_size)
{
esp_err_t err = http_response_set_header(http_ctx, "Content-type", content_type);
if (err != ESP_OK) {
return err;
}
http_ctx->expected_response_size = response_size;
http_ctx->accumulated_response_size = 0;
if (response_size != HTTP_RESPONSE_SIZE_UNKNOWN) {
err = http_add_content_length_header(http_ctx, response_size);
if (err != ESP_OK) {
return err;
}
}
return ESP_OK;
}
esp_err_t http_response_begin(http_context_t http_ctx, int code, const char* content_type, size_t response_size)
{
if (http_ctx->state != HTTP_COLLECTING_RESPONSE_HEADERS) {
return ESP_ERR_INVALID_STATE;
}
http_ctx->response_code = code;
return http_response_begin_common(http_ctx, content_type, response_size);
}
esp_err_t http_response_write(http_context_t http_ctx, const http_buffer_t* buffer)
{
if (http_ctx->state == HTTP_COLLECTING_RESPONSE_HEADERS) {
esp_err_t err = http_send_response_headers(http_ctx);
if (err != ESP_OK) {
return err;
}
}
const int flag = buffer->data_is_persistent ? NETCONN_NOCOPY : NETCONN_COPY;
size_t len = buffer->size ? buffer->size : strlen((const char*) buffer->data);
err_t rc = netconn_write(http_ctx->conn, buffer->data, len, flag);
if (rc != ESP_OK) {
ESP_LOGD(TAG, "netconn_write rc=%d", rc);
} else {
http_ctx->accumulated_response_size += len;
}
return lwip_err_to_esp_err(rc);
}
esp_err_t http_response_end(http_context_t http_ctx)
{
size_t expected = http_ctx->expected_response_size;
size_t actual = http_ctx->accumulated_response_size;
if (expected != HTTP_RESPONSE_SIZE_UNKNOWN && expected != actual) {
ESP_LOGW(TAG, "Expected response size: %d, actual: %d", expected, actual);
}
http_ctx->state = HTTP_DONE;
return ESP_OK;
}
esp_err_t http_response_begin_multipart(http_context_t http_ctx, const char* content_type, size_t response_size)
{
if (http_ctx->state == HTTP_COLLECTING_RESPONSE_HEADERS) {
http_send_response_headers(http_ctx);
http_ctx->response_code = 0;
}
http_ctx->state = HTTP_COLLECTING_RESPONSE_HEADERS;
return http_response_begin_common(http_ctx, content_type, response_size);
}
esp_err_t http_response_end_multipart(http_context_t http_ctx, const char* boundary)
{
size_t expected = http_ctx->expected_response_size;
size_t actual = http_ctx->accumulated_response_size;
if (expected != HTTP_RESPONSE_SIZE_UNKNOWN && expected != actual) {
ESP_LOGW(TAG, "Expected response size: %d, actual: %d", expected, actual);
}
/* reset expected_response_size so that http_response_end doesn't complain */
http_ctx->expected_response_size = HTTP_RESPONSE_SIZE_UNKNOWN;
const http_buffer_t buf = { .data = boundary };
esp_err_t ret = http_response_write(http_ctx, &buf);
http_ctx->state = HTTP_COLLECTING_RESPONSE_HEADERS;
return ret;
}
static esp_err_t add_keyval_pair(http_header_list_t *list, const char* name, const char* val)
{
size_t name_len = strlen(name) + 1;
size_t val_len = strlen(val) + 1;
/* Allocate memory for the structure, name, and value, in one go */
size_t buf_len = sizeof(http_header_t) + name_len + val_len;
char* buf = (char*) calloc(1, buf_len);
if (buf == NULL) {
return ESP_ERR_NO_MEM;
}
http_header_t* new_header = (http_header_t*) buf;
new_header->name = buf + sizeof(http_header_t);
new_header->value = new_header->name + name_len;
strcpy(new_header->name, name);
strcpy(new_header->value, val);
SLIST_INSERT_HEAD(list, new_header, list_entry);
return ESP_OK;
}
esp_err_t http_response_set_header(http_context_t http_ctx, const char* name, const char* val)
{
return add_keyval_pair(&http_ctx->response_headers, name, val);
}
static void http_send_not_found_response(http_context_t http_ctx)
{
http_response_begin(http_ctx, 404, "text/plain", HTTP_RESPONSE_SIZE_UNKNOWN);
const http_buffer_t buf = {
.data = "Not found",
.data_is_persistent = true
};
http_response_write(http_ctx, &buf);
http_response_end(http_ctx);
}
static const char* http_response_code_to_str(int code)
{
switch (code) {
case 200: return "OK";
case 204: return "No Content";
case 301: return "Moved Permanently";
case 302: return "Found";
case 400: return "Bad Request";
case 404: return "Not Found";
case 405: return "Method Not Allowed";
case 500: return "Internal Server Error";
default: return "";
}
}
static void http_handle_connection(http_server_t server, struct netconn *conn)
{
struct netbuf *inbuf = NULL;
char *buf;
u16_t buflen;
err_t err = ERR_OK;
/* Single threaded server, one context only */
http_context_t ctx = &server->connection_context;
/* Initialize context */
ctx->state = HTTP_PARSING_URI;
ctx->conn = conn;
http_parser_init(&ctx->parser, HTTP_REQUEST);
ctx->parser.data = ctx;
ctx->server = server;
const http_parser_settings parser_settings = {
.on_url = &http_url_cb,
.on_headers_complete = &http_headers_done_cb,
.on_header_field = &http_header_name_cb,
.on_header_value = &http_header_value_cb,
.on_body = &http_body_cb,
.on_message_complete = &http_message_done_cb
};
while (ctx->state != HTTP_REQUEST_DONE) {
err = netconn_recv(conn, &inbuf);
if (err != ERR_OK) {
break;
}
err = netbuf_data(inbuf, (void**) &buf, &buflen);
if (err != ERR_OK) {
break;
}
size_t parsed_bytes = http_parser_execute(&ctx->parser, &parser_settings, buf, buflen);
if (parsed_bytes < buflen) {
break;
}
}
if (err == ERR_OK) {
ctx->state = HTTP_COLLECTING_RESPONSE_HEADERS;
if (ctx->handler == NULL) {
http_send_not_found_response(ctx);
} else {
invoke_handler(ctx, HTTP_HANDLE_RESPONSE);
}
}
headers_list_clear(&ctx->request_headers);
headers_list_clear(&ctx->request_args);
free(ctx->uri);
ctx->uri = NULL;
ctx->handler = NULL;
if (err != ERR_CLSD) {
netconn_close(conn);
}
if (inbuf) {
netbuf_delete(inbuf);
}
}
static void http_server(void *arg)
{
http_server_t ctx = (http_server_t) arg;
struct netconn *client_conn;
err_t err;
ctx->server_conn = netconn_new(NETCONN_TCP);
if (ctx->server_conn == NULL) {
err = ERR_MEM;
goto out;
}
err = netconn_bind(ctx->server_conn, NULL, ctx->port);
if (err != ERR_OK) {
goto out;
}
err = netconn_listen(ctx->server_conn);
if (err != ERR_OK) {
goto out;
}
xEventGroupSetBits(ctx->start_done, SERVER_STARTED_BIT);
do {
err = netconn_accept(ctx->server_conn, &client_conn);
if (err == ERR_OK) {
http_handle_connection(ctx, client_conn);
netconn_delete(client_conn);
}
} while (err == ERR_OK);
out:
if (ctx->server_conn) {
netconn_close(ctx->server_conn);
netconn_delete(ctx->server_conn);
}
if (err != ERR_OK) {
ctx->server_task_err = err;
xEventGroupSetBits(ctx->start_done, SERVER_DONE_BIT);
}
vTaskDelete(NULL);
}
esp_err_t http_server_start(const http_server_options_t* options, http_server_t* out_server)
{
http_server_t ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
return ESP_ERR_NO_MEM;
}
ctx->port = options->port;
ctx->start_done = xEventGroupCreate();
if (ctx->start_done == NULL) {
free(ctx);
return ESP_ERR_NO_MEM;
}
int ret = xTaskCreatePinnedToCore(&http_server, "httpd",
options->task_stack_size, ctx,
options->task_priority,
&ctx->task,
options->task_affinity);
if (ret != pdPASS) {
vEventGroupDelete(ctx->start_done);
free(ctx);
return ESP_ERR_NO_MEM;
}
int bits = xEventGroupWaitBits(ctx->start_done, SERVER_STARTED_BIT | SERVER_DONE_BIT, 0, 0, portMAX_DELAY);
if (bits & SERVER_DONE_BIT) {
/* Error happened, task is deleted */
esp_err_t err = lwip_err_to_esp_err(ctx->server_task_err);
vEventGroupDelete(ctx->start_done);
free(ctx);
return err;
}
*out_server = ctx;
return ESP_OK;
}
esp_err_t http_server_stop(http_server_t server)
{
/* FIXME: figure out a thread safe way to do this */
netconn_close(server->server_conn);
xEventGroupWaitBits(server->start_done, SERVER_DONE_BIT, 0, 0, portMAX_DELAY);
free(server);
return ESP_OK;
}
http_server.h 0 → 100644
View file @ fc44658b
/* Simple HTTP server for ESP32.
* Copyright Ivan Grokhotkov, 2017.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
/**
* @file http_server.h
* @brief Simple HTTP server
*/
/* Pull in the definitions of HTTP methods */
#include "http_parser.h"
/**
* Bit masks for events to be passed to a handler
*/
#define HTTP_HANDLE_URI BIT(0) /*!< Called when URI is received */
#define HTTP_HANDLE_HEADERS BIT(1) /*!< Called when all headers are received */
#define HTTP_HANDLE_DATA BIT(2) /*!< Called each time a fragment of request body is received */
#define HTTP_HANDLE_RESPONSE BIT(3) /*!< Called at the end of the request to produce the response */
/** Opaque type representing single HTTP connection */
typedef struct http_context_* http_context_t;
/** Opaque type representing HTTP server */
typedef struct http_server_context_* http_server_t;
/** Callback type of HTTP request handler */
typedef void (* http_handler_fn_t)(http_context_t http_ctx, void* ctx);
/**
* @brief Configuration of the HTTP server
*/
typedef struct {
int port; /*!< TCP Port to listen on */
int task_affinity; /*!< Server task affinity (CPU number of tskNO_AFFINITY */
int task_stack_size; /*!< Server task stack size, in bytes */
int task_priority; /*!< Server task priority */
} http_server_options_t;
/** Default initializer for http_server_options_t */
#define HTTP_SERVER_OPTIONS_DEFAULT() {\
.port = 80, \
.task_affinity = tskNO_AFFINITY, \
.task_stack_size = 4096, \
.task_priority = 1, \
}
/**
* @brief initialize HTTP server, start listening
* @param options pointer to http server options, can point to a temporary
* @param[out] output, handle of the server; pass it to http_server_stop do
* delete the server.
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if out of RAM
* - ESP_FAIL if some other error
*/
esp_err_t http_server_start(const http_server_options_t* options, http_server_t* out_server);
/**
* @brief Stop the previously started server
* @param server handle obtained from http_server_start
* @return
* - ESP_OK on success
*/
esp_err_t http_server_stop(http_server_t server);
/**
* @brief Register a handler for certain URI
*
* The handler will be called when a client makes a request with matching URI
* and HTTP method.
*
* @note Currently only matches full URIs, doesn't support regex
*
* @param server Server handle to register the handler for
* @param uri_pattern URI pattern to match
* @param method one of HTTP_GET, HTTP_POST, HTTP_PUT, etc
* @param events a bit mask of HTTP_HANDLE_X events for which the handler
* should be called
* @param callback function to call
* @param callback_arg application context to pass to the callback
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if out of memory
*/
esp_err_t http_register_handler(http_server_t server, const char* uri_pattern, int method,
int events, http_handler_fn_t callback, void* callback_arg);
/**
* @brief Register a handler for application/x-www-form-urlencoded requests
*
* Unlike http_register_handler, handlers registered using this function will
* not receive HTTP_HANDLE_DATA events. Instead, request body will be parsed
* into key-value pairs, which can be retrieved while handling
* HTTP_HANDLE_RESPONSE event using http_request_get_form_value.
*
* @param server Server handle to register the handler for
* @param uri_pattern URI pattern to match
* @param method one of HTTP_GET, HTTP_POST, HTTP_PUT, etc
* @param events a bit mask of HTTP_HANDLE_X events for which the handler
* should be called. HTTP_HANDLE_DATA will not be passed to
* the callback.
* @param callback function to call
* @param callback_arg application context to pass to the callback
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if out of memory
*/
esp_err_t http_register_form_handler(http_server_t server, const char* uri_pattern, int method,
int events, http_handler_fn_t callback, void* callback_arg);
/**
* @brief Get value for given form item name
* @param http_ctx context passed to the handler
* @param name name of form item
* @return pointer to the form item value, valid until the end of request
*/
const char* http_request_get_form_value(http_context_t http_ctx, const char* name);
/**
* @brief Get request method
* @param http_ctx context passed to the handler
* @return one of HTTP_GET, HTTP_POST, etc
*/
int http_request_get_method(http_context_t http_ctx);
/**
* @brief Get URI present in the request
* @param http_ctx context passed to the handler
* @return pointer to the URI, valid until the end of request
*/
const char* http_request_get_uri(http_context_t http_ctx);
/**
* @brief Get request header
* @param http_ctx context passed to the handler
* @param name header name
* @return
* - If the header with given name is present in the request, returns
* pointer to the value; valid until request callback returns.
* - Otherwise, returns NULL
*/
const char* http_request_get_header(http_context_t ctx, const char* name);
/**
* @brief Get the event which caused a call to the handler
* @param ctx context passed to the handler
* @return one of HTTP_HANDLE_X values
*/
int http_request_get_event(http_context_t ctx);
/**
* @brief Get the request body fragment
* To be used when handling HTTP_HANDLE_DATA event.
*
* @param ctx context passed to the handler
* @param[out] out_data_ptr output, receives pointer to the body fragment
* @param[out] out_size output, receives the size of the body fragment
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if called for events other than HTTP_HANDLE_DATA
*/
esp_err_t http_request_get_data(http_context_t ctx, const char** out_data_ptr, size_t* out_size);
/**
* @brief structure describing a part of the response to be sent
*/
typedef struct {
const void* data; /*!< pointer to data to be sent */
size_t size; /*!< size of data to send; if data is a 0-terminated string, size can be left 0 */
bool data_is_persistent; /*!< set to true if data is in constant RAM */
} http_buffer_t;
#define HTTP_RESPONSE_SIZE_UNKNOWN SIZE_MAX
/**
* @brief Begin writing HTTP response
* @param http_ctx context passed to the handler
* @param code HTTP response code
* @param content_type string to send as a value in content-type header
* @param response_size either the size of the response body, or HTTP_RESPONSE_SIZE_UNKNOWN
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if can't allocate temporary buffer
* - other errors from LwIP
*/
esp_err_t http_response_begin(http_context_t http_ctx, int code,
const char* content_type, size_t response_size);
/**
* @brief Add HTTP header to the response
*
* This function may be called between http_response_begin and http_response_write.
*
* For multipart responses, calling it between http_response_begin and
* http_response_begin_multipart adds header to the list of headers in the original
* response (which is sent first). Calling it after http_response_begin_multipart
* adds the header to the list of headers sent for the current response part.
*
* 'name' and 'val' can point to temporary values. This function copies the
* both strings into internal storage.
*
* @param http_ctx context passed to the handler
* @param name Header name
* @param val Header value
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if can't allocate memory for the header
*/
esp_err_t http_response_set_header(http_context_t http_ctx,
const char* name, const char* val);
/**
* @brief Start one part of a multipart response
*
* For multipart responses, the sequence of calls is as follows:
*
* 1. http_response_begin (with size == HTTP_RESPONSE_SIZE_UNKNOWN)
* 2. (optional) http_response_set_header — for the overall response
* 3. http_response_begin_multipart (if part size is known, pass it in response_size argument)
* 4. (optional) http_repponse_set_header — for the current part
* 5. (optional) http_response_write — write response data
* 6. http_response_end_multipart — when done with the part
* 7. repeat from 3 as needed
*
* @param http_ctx context passed to the handler
* @param content_type value to be set in part's content-type header
* @param response_size either the size of part body, or HTTP_RESPONSE_SIZE_UNKNOWN
* @return
* - ESP_OK
* - ESP_ERR_NO_MEM if can't allocate memory
* - other errors from LwIP
*/
esp_err_t http_response_begin_multipart(http_context_t http_ctx,
const char* content_type, size_t response_size);
/**
* @brief Indicate that one part of the multipart response is finished
* @param http_ctx context passed to the handler
* @param boundary part boundary. Has to be the same as given in the content-type of the first response.
* @return
* - ESP_OK
* - other errors from LwIP
*/
esp_err_t http_response_end_multipart(http_context_t http_ctx, const char* boundary);
/**
* @brief Send a piece of HTTP response to the client
* @param http_ctx context passed to the handler
* @param buffer data to send, see \ref http_buffer_t
* @return
* - ESP_OK on success
* - other errors from LwIP
*/
esp_err_t http_response_write(http_context_t http_ctx, const http_buffer_t* buffer);
/**
* @brief Indicate that response is complete
* @param http_ctx context passed to the handler
* @return
* - ESP_OK on success
* - other errors in the future?
*/
esp_err_t http_response_end(http_context_t http_ctx);
#ifdef __cplusplus
}
#endif
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