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improve api response

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This commit is contained in:
Arthur Lu 2024-09-04 13:14:59 -07:00
parent 790262ac1c
commit 55c465fab9
2 changed files with 119 additions and 65 deletions
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94
http_parser.h
View File

@ -3,17 +3,18 @@
#include "llhttp.h"
#define HTTP_RESPONSE_HEADER_TEMPLATE "HTTP/1.1 %d %s\nContent-Length: %d\nContent-Type: %s; charset=utf-8\nConnection: close\n\n"
typedef struct HTTP_REQUEST_DATA_T_ {
char protocol[8];
char method[8];
llhttp_method_t method;
char url[128];
char body[128];
} HTTP_REQUEST_DATA_T;
typedef struct HTTP_REQUEST_PARSER_WRAPPER_T_ {
typedef struct HTTP_REQUEST_PARSER_T_ {
llhttp_t parser;
llhttp_settings_t settings;
} HTTP_REQUEST_PARSER_WRAPPER_T;
} HTTP_REQUEST_PARSER_T;
int request_parser_on_url(llhttp_t * parser, const char * start, size_t length) {
HTTP_REQUEST_DATA_T * http_request = parser->data;
@ -27,45 +28,36 @@ int request_parser_on_body(llhttp_t * parser, const char * start, size_t length)
return 0;
}
int parse_http_request (HTTP_REQUEST_PARSER_WRAPPER_T * wrapper, char * content, size_t len) {
int parse_http_request (HTTP_REQUEST_PARSER_T * wrapper, char * content, size_t len) {
llhttp_t parser = wrapper->parser;
llhttp_errno_t err = llhttp_execute(&parser, content, len);
HTTP_REQUEST_DATA_T * http_request = parser.data;
uint8_t protocol_major = llhttp_get_http_major(&parser);
uint8_t protocol_minor = llhttp_get_http_minor(&parser);
sprintf(http_request->protocol, "%d.%d", protocol_major, protocol_minor);
uint8_t method = llhttp_get_method(&parser);
const char * method_name = llhttp_method_name(method);
strcpy(http_request->method, method_name);
llhttp_method_t method = llhttp_get_method(&parser);
http_request->method = method;
return 0;
}
char * get_protocol (HTTP_REQUEST_PARSER_WRAPPER_T * wrapper) {
HTTP_REQUEST_DATA_T * http_request = wrapper->parser.data;
return http_request->protocol;
}
char * get_method (HTTP_REQUEST_PARSER_WRAPPER_T * wrapper) {
llhttp_method_t get_method (HTTP_REQUEST_PARSER_T * wrapper) {
HTTP_REQUEST_DATA_T * http_request = wrapper->parser.data;
return http_request->method;
}
char * get_url (HTTP_REQUEST_PARSER_WRAPPER_T * wrapper) {
char * get_url (HTTP_REQUEST_PARSER_T * wrapper) {
HTTP_REQUEST_DATA_T * http_request = wrapper->parser.data;
return http_request->url;
}
char * get_body (HTTP_REQUEST_PARSER_WRAPPER_T * wrapper) {
char * get_body (HTTP_REQUEST_PARSER_T * wrapper) {
HTTP_REQUEST_DATA_T * http_request = wrapper->parser.data;
return http_request->body;
}
HTTP_REQUEST_PARSER_WRAPPER_T * new_request_parser () {
HTTP_REQUEST_PARSER_WRAPPER_T * wrapper = calloc(1, sizeof(HTTP_REQUEST_PARSER_WRAPPER_T));
HTTP_REQUEST_PARSER_T * new_request_parser () {
// create new response parser wrapper
HTTP_REQUEST_PARSER_T * wrapper = calloc(1, sizeof(HTTP_REQUEST_PARSER_T));
// create a new request data struct
HTTP_REQUEST_DATA_T * http_request = calloc(1, sizeof(HTTP_REQUEST_DATA_T));
@ -82,11 +74,67 @@ HTTP_REQUEST_PARSER_WRAPPER_T * new_request_parser () {
return wrapper;
}
void delete_request_parser (HTTP_REQUEST_PARSER_WRAPPER_T * wrapper) {
void delete_request_parser (HTTP_REQUEST_PARSER_T * wrapper) {
free(wrapper->parser.data);
free(wrapper);
}
typedef struct HTTP_RESPONSE_DATA_T_ {
llhttp_status_t status;
char type[32];
char body[128];
} HTTP_RESPONSE_DATA_T;
typedef struct HTTP_RESPONSE_COMPOSER_T_ {
HTTP_RESPONSE_DATA_T * response_data;
char header[1024];
char body[128];
uint32_t header_length;
uint32_t content_length;
} HTTP_RESPONSE_COMPOSER_T;
void set_status (HTTP_RESPONSE_COMPOSER_T * composer, llhttp_status_t status) {
HTTP_RESPONSE_DATA_T * response_data = composer->response_data;
response_data->status = status;
}
void set_type (HTTP_RESPONSE_COMPOSER_T * composer, char * type) {
HTTP_RESPONSE_DATA_T * response_data = composer->response_data;
strncpy(response_data->type, type, 128);
}
void set_body (HTTP_RESPONSE_COMPOSER_T * composer, char * body) {
HTTP_RESPONSE_DATA_T * response_data = composer->response_data;
strncpy(response_data->body, body, 128);
}
void compose_http_response (HTTP_RESPONSE_COMPOSER_T * composer) {
HTTP_RESPONSE_DATA_T * response_data = composer->response_data;
composer->content_length = snprintf(composer->body, sizeof(composer->body), "%s", response_data->body);
const char * status_name = llhttp_status_name(response_data->status);
composer->header_length = snprintf(composer->header, sizeof(composer->header), HTTP_RESPONSE_HEADER_TEMPLATE, response_data->status, status_name, composer->content_length, response_data->type);
}
HTTP_RESPONSE_COMPOSER_T * new_response_composer () {
// create new response composer wrapper
HTTP_RESPONSE_COMPOSER_T * wrapper = calloc(1, sizeof(HTTP_RESPONSE_COMPOSER_T));
// create a new response data struct
HTTP_RESPONSE_DATA_T * http_response = calloc(1, sizeof(HTTP_RESPONSE_DATA_T));
wrapper->response_data = http_response;
return wrapper;
}
void delete_response_composer (HTTP_RESPONSE_COMPOSER_T * composer) {
free(composer->response_data);
free(composer);
}
int http_parser_init () {
return 0;
}

90
http_serv.h
View File

@ -7,9 +7,6 @@
#define HTTP_PORT 80
#define POLL_TIME_S 5
#define HTTP_GET "GET"
#define HTTP_POST "POST"
#define HTTP_RESPONSE_HEADER "HTTP/1.1 %d OK\nContent-Length: %d\nContent-Type: application/json; charset=utf-8\nConnection: close\n\n"
extern CURRENT_STATE_T current_state;
@ -22,11 +19,8 @@ typedef struct TCP_SERVER_T_ {
typedef struct TCP_CONNECT_STATE_T_ {
struct tcp_pcb * pcb;
int sent_len;
char headers[1024];
char result[128];
HTTP_REQUEST_PARSER_WRAPPER_T * request_parser;
int header_len;
int result_len;
HTTP_REQUEST_PARSER_T * request_parser;
HTTP_RESPONSE_COMPOSER_T * response_composer;
ip_addr_t * gw;
} TCP_CONNECT_STATE_T;
@ -48,6 +42,7 @@ static err_t tcp_close_client_connection(TCP_CONNECT_STATE_T * con_state, struct
}
if (con_state) {
delete_request_parser(con_state->request_parser);
delete_response_composer(con_state->response_composer);
free(con_state);
}
DEBUG_printf("[HTTP] [OK ] Finished and closed connection to client\n");
@ -67,8 +62,8 @@ static err_t tcp_server_sent(void * arg, struct tcp_pcb * pcb, u16_t len) {
TCP_CONNECT_STATE_T * con_state = (TCP_CONNECT_STATE_T *)arg;
DEBUG_printf("[HTTP] [OK ] Sent %u\n", len);
con_state->sent_len += len;
if (con_state->sent_len >= con_state->header_len + con_state->result_len) {
DEBUG_printf("[HTTP] [OK ] Send done\n");
if (con_state->sent_len >= con_state->response_composer->header_length + con_state->response_composer->content_length) {
DEBUG_printf("[HTTP] [OK ] Sent done\n");
return tcp_close_client_connection(con_state, pcb, ERR_OK);
}
return ERR_OK;
@ -76,26 +71,26 @@ static err_t tcp_server_sent(void * arg, struct tcp_pcb * pcb, u16_t len) {
int send_response (TCP_CONNECT_STATE_T * con_state, struct tcp_pcb * pcb) {
// Check result buffer size
if (con_state->result_len > sizeof(con_state->result) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much result data %d\n", con_state->result_len);
if (con_state->response_composer->content_length > sizeof(con_state->response_composer->body) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much result data %d\n", con_state->response_composer->content_length);
return tcp_close_client_connection(con_state, pcb, ERR_CLSD);
}
// Check header buffer size
if (con_state->header_len > sizeof(con_state->headers) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much header data %d\n", con_state->header_len);
if (con_state->response_composer->header_length > sizeof(con_state->response_composer->header) - 1) {
DEBUG_printf("[HTTP] [ERR] Too much header data %d\n", con_state->response_composer->header_length);
return tcp_close_client_connection(con_state, pcb, ERR_CLSD);
}
// Send the headers to the client
con_state->sent_len = 0;
err_t err = tcp_write(pcb, con_state->headers, con_state->header_len, 0);
err_t err = tcp_write(pcb, con_state->response_composer->header, con_state->response_composer->header_length, 0);
if (err != ERR_OK) {
DEBUG_printf("[HTTP] [ERR] Failed to write header data %d\n", err);
return tcp_close_client_connection(con_state, pcb, err);
}
// Send the body to the client
if (con_state->result_len) {
err = tcp_write(pcb, con_state->result, con_state->result_len, 0);
if (con_state->response_composer->content_length) {
err = tcp_write(pcb, con_state->response_composer->body, con_state->response_composer->content_length, 0);
if (err != ERR_OK) {
DEBUG_printf("[HTTP] [ERR] Failed to write result data %d\n", err);
return tcp_close_client_connection(con_state, pcb, err);
@ -104,32 +99,47 @@ int send_response (TCP_CONNECT_STATE_T * con_state, struct tcp_pcb * pcb) {
return 0;
}
static int handle_status_get (const char * request, const char * params, const char * body, char * result, size_t max_result_len) {
return snprintf(result, max_result_len, "{volt: %f, temp: %f, power: %d}", current_state.voltage, current_state.tempC, current_state.power_state);
void handle_status_get (const char * request, const char * params, char * body, HTTP_RESPONSE_COMPOSER_T * response) {
set_status(response, 200);
set_type(response, "application/json");
char response_body[128];
snprintf(response_body, 128, "{volt: %f, temp: %f, power: %d}", current_state.voltage, current_state.tempC, current_state.power_state);
set_body(response, response_body);
}
static int handle_power_post (const char * request, const char * params, const char * body, char * result, size_t max_result_len) {
void handle_power_post (const char * request, const char * params, char * body, HTTP_RESPONSE_COMPOSER_T * response) {
set_type(response, "application/json");
if (strstr(body, "requested_state")) {
int requested_power_state_int;
int led_param = sscanf(body, "requested_state=%d", &requested_power_state_int);
if (led_param) {
if (requested_power_state_int == 0 || requested_power_state_int == 1) {
set_status(response, 200);
bmc_power_handler((bool) requested_power_state_int);
return snprintf(result, max_result_len, "{}");
set_body(response, "{}");
}
else {
return snprintf(result, max_result_len, "{error: true, description: \"invalid requested state, must be 0 or 1\"}");
set_status(response, 400);
set_body(response, "{error: true, description: \"invalid requested state, must be 0 or 1\"}");
}
}
else {
return snprintf(result, max_result_len, "{error: true, description: \"invalid requested state, must be 0 or 1\"}");
set_status(response, 400);
set_body(response, "{error: true, description: \"invalid requested state, must be 0 or 1\"}");
}
}
else {
return snprintf(result, max_result_len, "{error: true, description: \"missing required parameter requested_state\"}");
set_status(response, 400);
set_body(response, "{error: true, description: \"missing required parameter requested_state\"}");
}
}
void handle_404_not_found (const char * request, const char * params, char * body, HTTP_RESPONSE_COMPOSER_T * response) {
set_status(response, 404);
set_type(response, "application/json");
set_body(response, "");
}
err_t tcp_server_recv(void * arg, struct tcp_pcb * pcb, struct pbuf * p, err_t err) {
TCP_CONNECT_STATE_T * con_state = (TCP_CONNECT_STATE_T *)arg;
if (!p) {
@ -138,42 +148,38 @@ err_t tcp_server_recv(void * arg, struct tcp_pcb * pcb, struct pbuf * p, err_t e
}
assert(con_state && con_state->pcb == pcb);
if (p->tot_len > 0) {
DEBUG_printf("[HTTP] [OK ] Server recieved %d err %d\n", p->tot_len, err);
DEBUG_printf("[HTTP] [OK ] Recieved %d err: %d\n", p->tot_len, err);
char content[2048] = {0};
pbuf_copy_partial(p, &content, 2048 - 1, 0);
con_state->request_parser = new_request_parser();
parse_http_request(con_state->request_parser, content, strlen(content));
char * protocol = get_protocol(con_state->request_parser);
char * method = get_method(con_state->request_parser);
llhttp_method_t method = get_method(con_state->request_parser);
char * url = get_url(con_state->request_parser);
char * body = get_body(con_state->request_parser);
// print request
DEBUG_printf("[HTTP] [OK ] Request: %s %s %s\n", method, url, body);
// debug print request
const char * method_name = llhttp_method_name(method);
DEBUG_printf("[HTTP] [OK ] Request: %s %s %s\n", method_name, url, body);
int response_code;
con_state->response_composer = new_response_composer();
// parse request depending on method and request
if (strncmp(method, HTTP_GET, sizeof(HTTP_GET) - 1) == 0 && strncmp(url, "/status", sizeof("/status") - 1) == 0) {
con_state->result_len = handle_status_get(url, NULL, body, con_state->result, sizeof(con_state->result));
response_code = 200;
con_state->header_len = snprintf(con_state->headers, sizeof(con_state->headers), HTTP_RESPONSE_HEADER, response_code, con_state->result_len);
if (method == HTTP_GET && strncmp(url, "/status", sizeof("/status") - 1) == 0) {
handle_status_get(url, NULL, body, con_state->response_composer);
}
else if (strncmp(method, HTTP_POST, sizeof(HTTP_POST) - 1) == 0 && strncmp(url, "/power", sizeof("/power") - 1) == 0) {
con_state->result_len = handle_power_post(url, NULL, body, con_state->result, sizeof(con_state->result));
response_code = 200;
con_state->header_len = snprintf(con_state->headers, sizeof(con_state->headers), HTTP_RESPONSE_HEADER, response_code, con_state->result_len);
else if (method == HTTP_POST && strncmp(url, "/power", sizeof("/power") - 1) == 0) {
handle_power_post(url, NULL, body, con_state->response_composer);
}
else { // if not a registered path, return HTTP 404
con_state->result_len = 0;
response_code = 404;
con_state->header_len = snprintf(con_state->headers, sizeof(con_state->headers), HTTP_RESPONSE_HEADER, response_code, con_state->result_len);
handle_404_not_found(url, NULL, body, con_state->response_composer);
}
compose_http_response(con_state->response_composer);
// print result
DEBUG_printf("[HTTP] [OK ] Result: %d %s\n", response_code, con_state->result);
DEBUG_printf("[HTTP] [OK ] Result: %s %s\n", con_state->response_composer->header, con_state->response_composer->body);
int err;
if (err = send_response(con_state, pcb)) {