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/**
* part of Hydrilla
* Serving data queries over HTTP using libmicrohttpd.
*
* Copyright (C) 2021 Wojtek Kosior
* Redistribution terms are gathered in the `copyright' file.
*
* This file is based on Christian Grothoff's public comain code from
* `doc/examples/logging.c' in libmicrohttpd source tree.
*/
#define _POSIX_C_SOURCE 199506L /* sigwait() */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <microhttpd.h>
#include "scriptbase.h"
#define PORT 10111
#define ARRLEN(array) (sizeof(array) / sizeof(*array))
static struct MHD_Response *default_response, *error_response,
*not_found_response;
static struct {
struct MHD_Response **response;
const char *const text;
} static_responses[] = {
{&default_response, "<html><body>Nothing to see here</body></html>"},
{&error_response, "<html><body>Error occured</body></html>"},
{¬_found_response, "<html><body>Not found</body></html>"}
};
static int add_CORS_header(struct MHD_Response *response)
{
return -1 * (MHD_add_response_header(response,
"Access-Control-Allow-Origin",
"*") == MHD_NO);
}
typedef char *(*request_handler_t)(const char *queried,
struct scriptbase *base);
static struct {
const char *path;
request_handler_t request_handler;
} resources[] = {
{"/script", get_script_json},
{"/bag", get_bag_json},
{"/pattern", get_pattern_json},
{"/query", get_page_query_json}
};
struct request_handling {
struct scriptbase *base;
request_handler_t handler;
char *json_response;
int error_number;
};
static int handle_query_argument(void *cls, enum MHD_ValueKind kind,
const char *key, const char *value)
{
struct request_handling *handling = cls;
if (strcmp(key, "n")) {
fprintf(stderr, "Unknown argument: \"%s\" = \"%s\"\n",
key, value);
return MHD_YES;
}
errno = 0;
handling->json_response = handling->handler(value, handling->base);
handling->error_number = errno;
return MHD_NO;
}
static int answer_with(struct MHD_Connection *connection,
request_handler_t handler, struct scriptbase *base)
{
struct request_handling handling = {base, handler, NULL, EINVAL};
struct MHD_Response *response;
int retval;
MHD_get_connection_values(connection, MHD_GET_ARGUMENT_KIND,
handle_query_argument, &handling);
if (!handling.json_response) {
if (handling.error_number)
goto send_error;
goto send_not_found;
}
response = MHD_create_response_from_buffer
(strlen(handling.json_response), handling.json_response,
MHD_RESPMEM_MUST_FREE);
if (!response || add_CORS_header(response))
goto send_error;
retval = MHD_queue_response(connection, MHD_HTTP_OK, response);
MHD_destroy_response(response);
return retval;
send_not_found:
return MHD_queue_response(connection, MHD_HTTP_NOT_FOUND,
not_found_response);
send_error:
free(handling.json_response);
return MHD_queue_response(connection, MHD_HTTP_INTERNAL_SERVER_ERROR,
error_response);
}
static int answer(void *data,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **ptr)
{
static int aptr;
int i;
struct scriptbase *base = data;
printf("New %s request for %s using version %s\n", method, url, version);
if (strcmp(method, "GET"))
return MHD_NO;
if (&aptr != *ptr) {
/* do never respond on first call */
*ptr = &aptr;
return MHD_YES;
}
*ptr = NULL; /* reset when done */
for (i = 0; i < ARRLEN(resources); i++) {
if (strcmp(resources[i].path, url))
continue;
return answer_with(connection, resources[i].request_handler,
base);
}
return MHD_queue_response(connection, MHD_HTTP_OK, default_response);
}
int getchar(void);
int serve_scriptbase(struct scriptbase *base, bool wait_for_sigterm)
{
int i;
struct MHD_Daemon *daemon;
sigset_t sigterm_set;
int signal_number; /* only written, not read */
int retval = -1;
if (init_url_lookup_regex())
return -1;
for (i = 0; i < ARRLEN(static_responses); i++) {
*static_responses[i].response = MHD_create_response_from_buffer
(strlen(static_responses[i].text),
(char*) static_responses[i].text,
MHD_RESPMEM_PERSISTENT);
if (!*static_responses[i].response ||
add_CORS_header(*static_responses[i].response))
goto free_resources;
}
daemon = MHD_start_daemon(MHD_USE_INTERNAL_POLLING_THREAD, PORT, NULL,
NULL, &answer, (void*) base, MHD_OPTION_END);
if (!daemon)
goto free_resources;
if (wait_for_sigterm) {
sigemptyset(&sigterm_set);
sigaddset(&sigterm_set, SIGTERM);
sigwait(&sigterm_set, &signal_number);
} else {
getchar();
}
MHD_stop_daemon(daemon);
retval = 0;
free_resources:
for (i = 0; i < ARRLEN(static_responses); i++) {
if (*static_responses[i].response)
MHD_destroy_response(*static_responses[i].response);
*static_responses[i].response = NULL;
}
destroy_url_lookup_regex();
return retval;
}
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