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lib.d
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172
lib.d
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module lib;
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/*
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lost+skunk <git.macaw.me/skunky>, 2025;
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Licensed under WTFPL
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*/
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import core.stdc.stdio;
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import core.sys.linux.epoll;
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import core.sys.linux.netinet.tcp;
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import core.sys.posix.netinet.in_;
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import core.sys.posix.unistd;
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import core.sys.posix.sys.socket;
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import util;
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struct Response {
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short status = 200;
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ubyte[] body;
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string[string] headers;
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string mimetype = "application/octet-stream";
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}
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struct Request {
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enum Methods {
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GET = "GET",
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PUT = "PUT",
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POST = "POST",
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DELETE = "DELETE",
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OPTIONS = "OPTIONS",
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// остальное лень реализовывать, да и не трэба..
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}
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Methods method;
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string path, body;
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string[string] headers;
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}
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struct Server {
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string address;
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short port;
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private shared int epfd, sock;
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void start(MD...)() { // реализовать прокидывания структуры/класса для роутинга
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sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, cast(void*)(new int), int.sizeof);
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setsockopt(sock, IPPROTO_TCP, SO_REUSEADDR, cast(void*)(new int), int.sizeof);
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sockaddr_in sockt;
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sockt.sin_family = AF_INET;
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sockt.sin_port = htons(port);
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sockt.sin_addr.s_addr = inet_addr(cast(char*)address);
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err(bind(sock, cast(sockaddr*)&sockt, sockt.sizeof), "bind");
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err(listen(sock, 512), "listen");
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serve!MD;
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}
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void shutdown() {
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epfd.close();
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sock.close();
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}
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void serve(T...)() {
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epfd = epoll_create(MAX_CLIENTS);
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epoll_event ev;
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epoll_event[MAX_EVENTS] evts;
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ev.events = EPOLLIN | EPOLLOUT | EPOLLET;
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ev.data.fd = sock;
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epoll_ctl(epfd, EPOLL_CTL_ADD, sock, &ev);
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for (;;) {
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auto w = epoll_wait(epfd, &evts[0], MAX_EVENTS, -1);
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for (int i = 0; i < w; ++i) {
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auto fd = evts[i].data.fd;
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if (fd == sock) {
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sockaddr_in addr;
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socklen_t al = sockaddr_in.sizeof;
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ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP | EPOLLHUP;
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ev.data.fd = accept4(sock, cast(sockaddr*)&addr, &al, SOCK_NONBLOCK);
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epoll_ctl(epfd, EPOLL_CTL_ADD, ev.data.fd, &ev);
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} else if (evts[i].events & EPOLLIN) { rd:
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ubyte[1024] buf;
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for (;;) { // обработчик запросов
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if (read(fd, cast(void*)buf, buf.sizeof) > 0) {
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auto rqst = parseReq(cast(string)buf);
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static foreach (mm; __traits(allMembers, T)) {
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static if (__traits(isStaticFunction, __traits(getMember, T, mm))) {
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foreach(attr; __traits(getAttributes, __traits(getMember, T, mm))) {
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static if (is(typeof(attr) == Location)) {
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if (rqst.path == attr.path) {
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Response rsp;
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__traits(getMember, T, mm)(&rsp, &rqst);
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char[] headers;
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foreach(header,content;rsp.headers)
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headers ~= "\r\n" ~ header ~ ": " ~ content;
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auto head =
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"HTTP/1.1 " ~ intToStr(rsp.status) ~ ' ' ~ getStatus(rsp.status) // временно
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~ "\r\nContent-length: " ~ intToStr(rsp.body.length)
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~ "\r\nContent-Type: " ~ rsp.mimetype
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~ headers
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~ "\r\n\r\n";
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write(fd, cast(void*)head, head.length);
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write(fd, cast(void*)rsp.body, rsp.body.length);
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goto rd;
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} else continue;
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}
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}
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}
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}
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static auto resp="HTTP/1.1 404 Not Found\r\nContent-length: 0\r\n\r\n";
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write(fd, cast(void*)resp, resp.length);
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} else break;
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}
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}
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if (evts[i].events & (EPOLLRDHUP | EPOLLHUP)) {
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epoll_ctl(epfd, EPOLL_CTL_DEL, fd, null);
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close(fd);
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break;
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}
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}
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}
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}
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Request parseReq(string body) { // TODO: реализовать парсинг заголовков, оформленных хер пойми как
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int prev;
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short[] xxx;
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Request req;
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for (short i; i < body.length; ++i) {
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if (body[i] == '\r') {
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auto splitted = body[prev..i];
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for (short x = 1; x < splitted.length; ++x) {
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if (prev == 0) { // для прочего говна (метода, пути и протокола)
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if (splitted[x] == ' ')
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xxx ~= x;
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else if (xxx.length == 2) {
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req.method = splitted[0..xxx[0]];
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req.path = splitted[xxx[0]+1..xxx[1]];
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// if (splitted[xxx[1]..$] != " HTTP/1.1")
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// throw new Exception("Unsupported HTTP version");
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} else continue;
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} else if (splitted[x-1] == ':') { // для заголовков
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req.headers[splitted[0..x-1]] = splitted[x+1..$];
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break;
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}
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}
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prev = i+2;
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if (body[prev] == '\r') {
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req.body = body[prev+2..$];
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break;
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}
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}
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}
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return req;
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}
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}
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private:
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enum BACKLOG = 512;
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enum MAX_EVENTS = 512;
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enum MAX_CLIENTS = 512;
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enum MAX_MESSAGE_LEN = 2048;
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enum SOCK_NONBLOCK = 0x800;
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enum MAX_RESPONSES = 512;
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extern (C) int accept4(int, sockaddr*, socklen_t*, int);
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23
main.d
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23
main.d
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@ -0,0 +1,23 @@
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module app; // обязательно
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import lib, util: Location;
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void main() {
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auto srv = Server("127.0.0.1", 3003);
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srv.start!app;
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// srv.shutdown;
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}
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@Location("/skunk")
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void huy(Response* w, Request* r) {
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w.body = cast(ubyte[])"skunk";
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return;
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}
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@Location("/skunks")
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void z(Response* w, Request* r) {
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w.headers["X-Powered-By"] = "D";
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w.headers["Lang"] = "D";
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w.status = 410;
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w.mimetype = "text/plain;charset=utf-8";
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w.body = cast(ubyte[])"скунсы";
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return;
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}
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98
util.d
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98
util.d
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module util;
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char[] intToStr(T)(T num) {
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char[] buf;
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for(short i; num > 0; ++i) {
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buf = (num % 10 + '0')~buf;
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num /= 10;
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}
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return buf;
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}
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void err(int e, string msg) {
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if (e != 0)
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throw new Exception("Something went wrong: failed to "~msg~'.');
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}
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// UDA
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struct Location { string path; }
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// enum method;
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string getStatus(short status) {
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static foreach(mmbr; __traits(allMembers, Statuses))
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if (__traits(getMember, Statuses, mmbr) == status)
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return __traits(getAttributes, __traits(getMember, Statuses, mmbr))[0];
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return "";
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}
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private static enum Statuses: short { // спизженно с https://github.com/zigzap/zap/blob/675c65b509d48c21a8d1fa4c5ec53fc407643a3b/src/http.zig#L6
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// Information responses
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@("Continue") continuee = 100,
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@("Switching Protocols") switching_protocols = 101,
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@("Processing") processing = 102, // (WebDAV)
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@("Early Hints") early_hints = 103,
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// Successful responses
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@("OK") ok = 200,
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@("Created") created = 201,
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@("Accepted") accepted = 202,
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@("Non-Authoritative Information") non_authoritative_information = 203,
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@("No Content") no_content = 204,
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@("Reset Content") reset_content = 205,
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@("Partial Content") partial_content = 206,
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@("Multi-Status") multi_status = 207, // (WebDAV)
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@("Already Reported") already_reported = 208, // (WebDAV)
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@("IM Used") im_used = 226, // (HTTP Delta encoding)
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// Redirection messages
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@("Multiple Choices") multiple_choices = 300,
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@("Moved Permanently") moved_permanently = 301,
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@("Found") found = 302,
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@("See Other") see_other = 303,
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@("Not Modified") not_modified = 304,
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@("Use Proxy") use_proxy = 305,
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@("Unused") unused = 306,
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@("Temporary Redirect") temporary_redirect = 307,
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@("Permanent Redirect") permanent_redirect = 308,
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// Client error responses
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@("Bad Request") bad_request = 400,
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@("Unauthorized") unauthorized = 401,
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@("Payment Required") payment_required = 402,
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@("Forbidden") forbidden = 403,
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@("Not Found") not_found = 404,
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@("Method Not Allowed") method_not_allowed = 405,
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@("Not Acceptable") not_acceptable = 406,
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@("Proxy Authentication Required") proxy_authentication_required = 407,
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@("Request Timeout") request_timeout = 408,
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@("Conflict") conflict = 409,
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@("Gone") gone = 410,
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@("Length Required") length_required = 411,
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@("Precondition Failed") precondition_failed = 412,
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@("Payload Too Large") payload_too_large = 413,
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@("URI Too Long") uri_too_long = 414,
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@("Unsupported Media Type") unsupported_media_type = 415,
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@("Range Not Satisfiable") range_not_satisfiable = 416,
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@("Expectation Failed") expectation_failed = 417,
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@("I'm a teapot") im_a_teapot = 418,
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@("Misdirected Request") misdirected_request = 421,
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@("Unprocessable Content") unprocessable_content = 422, // (WebDAV)
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@("Locked") locked = 423, // (WebDAV)
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@("Failed Dependency") failed_dependency = 424, // (WebDAV)
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@("Too Early") too_early = 425,
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@("Upgrade Required") upgrade_required = 426,
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@("Precondition Required") precondition_required = 428,
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@("Too Many Requests") too_many_requests = 429,
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@("Request Header Fields Too Large") request_header_fields_too_large = 431,
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@("Unavailable For Legal Reasons") unavailable_for_legal_reasons = 451,
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// Server error responses
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@("Internal Server Error") internal_server_error = 500,
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@("Not Implemented") not_implemented = 501,
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@("Bad Gateway") bad_gateway = 502,
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@("Service Unavailable") service_unavailable = 503,
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@("Gateway Timeout") gateway_timeout = 504,
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@("HTTP Version Not Supported") http_version_not_supported = 505,
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@("Variant Also Negotiates") variant_also_negoti
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}
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