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#include <arpa/inet.h>
#include <json-c/json.h>
#include <signal.h>
#include <sqlite3.h>
#include <string.h>
#include <threads.h>
#include "logger.c"
#define BACKLOG 10
struct Socket {
int fd;
struct sockaddr_in addr;
};
sqlite3 *g_sim_db;
void (*g_info)(const char *fmt, ...) = log_info;
void (*g_warn)(const char *fmt, ...) = log_warn;
#include "sql.c"
// ----------------------------------------------------------------------------
// SQL functions
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// Main functions
// ----------------------------------------------------------------------------
void sig_handler(int signo) {
log_warn("Signal %d received, shutting down data server", signo);
exit(0);
}
void respond_name(int socket_fd) {
log_info("Client requested simulation name");
struct json_object *sim_name = json_object_new_object();
json_object_object_add(sim_name, "name", json_object_new_string(NAME));
json_object_to_fd(socket_fd, sim_name, 0);
json_object_put(sim_name);
}
void respond_opts(int socket_fd) {
log_info("Client requested simulation options");
struct json_object *sim_opts = json_object_from_file(SIM_OPTS);
json_object_to_fd(socket_fd, sim_opts, 0);
json_object_put(sim_opts);
}
void respond_hash(int socket_fd) {
log_info("Client requested git hash");
char buff[41] = { 0 };
FILE *pipe = popen("git rev-parse HEAD", "r");
fread(buff, sizeof(char), 40, pipe);
pclose(pipe);
struct json_object *git_hash = json_object_new_object();
json_object_object_add(git_hash, "hash", json_object_new_string(buff));
json_object_to_fd(socket_fd, git_hash, 0);
json_object_put(git_hash);
}
void respond_data(int socket_fd, struct json_object *request) {
assert(request);
const char *request_str = json_object_to_json_string(request);
log_info("Client requested simulation data with the following parameters: %s", request_str);
struct json_object *response = json_object_new_object();
json_object_object_add(response, "response", json_object_new_string("hello!"));
const char *response_str = json_object_to_json_string(response);
log_info("Sending response to client: %s", response_str);
json_object_to_fd(socket_fd, response, 0);
shutdown(socket_fd, SHUT_WR);
json_object_put(response);
}
int handle_client(struct Socket *socket) {
assert(socket);
char socket_ip[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &socket->addr.sin_addr, socket_ip, INET_ADDRSTRLEN);
log_info("Client connected: %s:%d", socket_ip, ntohs(socket->addr.sin_port));
struct json_object *request_json = json_object_from_fd(socket->fd);
struct json_object *request_str = NULL;
if (!json_object_object_get_ex(request_json, "request", &request_str)) assert(false);
const char *request = json_object_get_string(request_str);
assert(request);
if (!strcmp(request, "name")) {
respond_name(socket->fd);
} else if (!strcmp(request, "opts")) {
respond_opts(socket->fd);
} else if (!strcmp(request, "hash")) {
respond_hash(socket->fd);
} else if (!strcmp(request, "data")) {
respond_data(socket->fd, request_json);
} else {
assert(false);
}
json_object_put(request_json);
log_info("Client disconnected: %s:%d", socket_ip, ntohs(socket->addr.sin_port));
close(socket->fd);
free(socket);
return 0;
}
int main(void) {
signal(SIGINT, sig_handler);
signal(SIGTERM, sig_handler);
log_info("Initializing salis data server");
log_info("Connecting to database in: %s", DATA_PUSH_PATH);
sqlite3_open(DATA_PUSH_PATH, &g_sim_db);
assert(g_sim_db);
// Install busy handler to retry transactions if DB is locked
sqlite3_busy_timeout(g_sim_db, DATA_PUSH_BUSY_TIMEOUT);
// Enable Write-Ahead Logging (WAL)
// This seems to help prevent DB locks when displaying live data.
// See: https://sqlite.org/wal.html
salis_exec_sql(0, NULL, NULL, "pragma journal_mode=wal;");
log_info("Binding to port: %d", PORT);
int opt = 1;
int socket_fd = socket(AF_INET, SOCK_STREAM, 0);
setsockopt(socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
struct sockaddr_in socket_addr = { 0 };
socket_addr.sin_family = AF_INET;
socket_addr.sin_addr.s_addr = INADDR_ANY;
socket_addr.sin_port = htons(PORT);
bind(socket_fd, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr_in));
log_info("Listening...");
listen(socket_fd, BACKLOG);
while (true) {
struct Socket *socket = calloc(1, sizeof(struct Socket));
socklen_t socket_len = sizeof(struct sockaddr_in);
socket->fd = accept(socket_fd, (struct sockaddr *)&socket->addr, &socket_len);
thrd_t thrd;
thrd_create(&thrd, (thrd_start_t)handle_client, socket);
thrd_detach(thrd);
}
close(socket_fd);
return 0;
}
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