Basic web server
This commit is contained in:
commit
5fbb1b480b
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/zig-out
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/zig-cache
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const std = @import("std");
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pub fn build(b: *std.build.Builder) void {
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// Standard target options allows the person running `zig build` to choose
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// what target to build for. Here we do not override the defaults, which
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// means any target is allowed, and the default is native. Other options
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// for restricting supported target set are available.
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const target = b.standardTargetOptions(.{});
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// Standard release options allow the person running `zig build` to select
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// between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
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const mode = b.standardReleaseOptions();
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const exe = b.addExecutable("apub", "src/main.zig");
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exe.setTarget(target);
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exe.setBuildMode(mode);
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exe.install();
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const run_cmd = exe.run();
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run_cmd.step.dependOn(b.getInstallStep());
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if (b.args) |args| {
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run_cmd.addArgs(args);
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}
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const run_step = b.step("run", "Run the app");
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run_step.dependOn(&run_cmd.step);
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}
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const std = @import("std");
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pub const io_mode = .evented;
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const HeaderMap = std.StringHashMap([]const u8);
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const Reader = std.net.Stream.Reader;
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const Writer = std.net.Stream.Writer;
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fn handleBadRequest(writer: Writer) !void {
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std.log.info("400 Bad Request", .{});
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try writer.writeAll("HTTP/1.1 400 Bad Request");
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}
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fn handleNotImplemented(writer: Writer) !void {
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std.log.info("501", .{});
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try writer.writeAll("HTTP/1.1 501 Not Implemented");
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}
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fn handleInternalError(writer: Writer) !void {
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std.log.info("500", .{});
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try writer.writeAll("HTTP/1.1 500 Internal Server Error");
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}
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const Method = enum {
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GET,
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//HEAD,
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POST,
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//PUT,
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//DELETE,
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//CONNECT,
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//OPTIONS,
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//TRACE,
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};
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fn areStringsEqual(lhs: []const u8, rhs: []const u8) bool {
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if (lhs.len != rhs.len) return false;
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for (lhs) |_, i| {
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if (lhs[i] != rhs[i]) return false;
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}
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return true;
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}
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fn parseHttpMethod(reader: Reader) !Method {
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var buf: [8]u8 = undefined;
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const str = reader.readUntilDelimiter(&buf, ' ') catch |err| switch (err) {
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error.StreamTooLong => return error.MethodNotImplemented,
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else => return err,
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};
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inline for (@typeInfo(Method).Enum.fields) |method| {
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if (areStringsEqual(method.name, str)) {
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return @intToEnum(Method, method.value);
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}
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}
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return error.MethodNotImplemented;
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}
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fn checkProto(reader: Reader) !void {
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var buf: [8]u8 = undefined;
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const proto = reader.readUntilDelimiter(&buf, '/') catch |err| switch (err) {
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error.StreamTooLong => return error.UnknownProtocol,
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else => return err,
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};
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if (!areStringsEqual(proto, "HTTP")) {
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return error.UnknownProtocol;
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}
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const count = try reader.read(buf[0..3]);
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if (count != 3 or buf[1] != '.') {
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return error.BadRequest;
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}
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if (buf[0] != '1' or buf[2] != '1') {
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return error.HttpVersionNotSupported;
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}
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}
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fn extractHeaderName(line: []const u8) ?[]const u8 {
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var index: usize = 0;
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// TODO: handle whitespace
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while (index < line.len) : (index += 1) {
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if (line[index] == ':') {
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if (index == 0) return null;
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return line[0..index];
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}
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}
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return null;
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}
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fn parseHeaders(allocator: std.mem.Allocator, reader: Reader) !HeaderMap {
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var map = HeaderMap.init(allocator);
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errdefer map.deinit();
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// TODO: free map keys/values
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var buf: [1024]u8 = undefined;
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while (true) {
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const line = try reader.readUntilDelimiter(&buf, '\n');
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if (line.len == 0 or (line.len == 1 and line[0] == '\r')) break;
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// TODO: handle multi-line headers
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const name = extractHeaderName(line) orelse continue;
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const value = line[name.len + 1 + 1 ..];
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if (name.len == 0 or value.len == 0) return error.BadRequest;
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const name_alloc = try allocator.alloc(u8, name.len);
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errdefer allocator.free(name_alloc);
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const value_alloc = try allocator.alloc(u8, value.len);
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errdefer allocator.free(value_alloc);
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@memcpy(name_alloc.ptr, name.ptr, name.len);
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@memcpy(value_alloc.ptr, value.ptr, value.len);
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for (name_alloc) |*ch| {
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//TODO: utf8
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ch.* = std.ascii.toLower(ch.*);
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}
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try map.put(name_alloc, value_alloc);
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}
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return map;
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}
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fn handleConnection(conn: std.net.StreamServer.Connection) void {
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defer conn.stream.close();
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const reader = conn.stream.reader();
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const writer = conn.stream.writer();
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handleRequest(reader, writer) catch |err| std.log.err("unhandled error processing connection: {}", .{err});
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}
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fn handleRequest(reader: Reader, writer: Writer) !void {
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handleHttpRequest(reader, writer) catch |err| switch (err) {
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error.BadRequest, error.UnknownProtocol => try handleBadRequest(writer),
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error.MethodNotImplemented, error.HttpVersionNotSupported => try handleNotImplemented(writer),
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else => {
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std.log.err("unknown error handling request: {}", .{err});
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try handleInternalError(writer);
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},
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};
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}
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fn handleHttpRequest(reader: Reader, writer: Writer) anyerror!void {
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const method = try parseHttpMethod(reader);
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var header_buf: [1 << 16]u8 = undefined;
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var fba = std.heap.FixedBufferAllocator.init(&header_buf);
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const allocator = fba.allocator();
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const path = reader.readUntilDelimiterAlloc(allocator, ' ', header_buf.len) catch |err| switch (err) {
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error.StreamTooLong => return error.URITooLong,
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else => return err,
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};
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try checkProto(reader);
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_ = try reader.readByte();
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_ = try reader.readByte();
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const headers = try parseHeaders(allocator, reader);
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const has_body = (headers.get("content-length") orelse headers.get("transfer-encoding")) != null;
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const tfer_encoding = headers.get("transfer-encoding");
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if (tfer_encoding != null and !areStringsEqual(tfer_encoding.?, "identity")) {
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return error.UnsupportedMediaType;
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}
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const encoding = headers.get("content-encoding");
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if (encoding != null and !areStringsEqual(encoding.?, "identity")) {
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return error.UnsupportedMediaType;
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}
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var context = Context{
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.request = .{
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.method = method,
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.path = path,
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.headers = headers,
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.body = if (has_body) reader else null,
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},
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.response = .{
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.headers = HeaderMap.init(allocator),
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.writer = writer,
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},
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.allocator = allocator,
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};
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try routeRequest(&context);
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}
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const Context = struct {
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const Request = struct {
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method: Method,
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path: []const u8,
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route: ?*const Route = null,
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headers: HeaderMap,
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body: ?Reader,
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pub fn arg(self: *Request, name: []const u8) []const u8 {
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return self.route.?.arg(name, self.path);
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}
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};
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const Response = struct {
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headers: HeaderMap,
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writer: Writer,
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fn writeHeaders(self: *Response) !void {
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var iter = self.headers.iterator();
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var it = iter.next();
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while (it != null) : (it = iter.next()) {
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try self.writer.print("{s}: {s}\r\n", .{ it.?.key_ptr.*, it.?.value_ptr.* });
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}
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}
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fn statusText(status: u16) []const u8 {
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return switch (status) {
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200 => "OK",
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204 => "No Content",
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else => "",
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};
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}
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fn openInternal(self: *Response, status: u16) !void {
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try self.writer.print("HTTP/1.1 {} {s}\r\n", .{ status, statusText(status) });
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try self.writeHeaders();
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try self.writer.writeAll("Connection: close\r\n"); // TODO
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}
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pub fn open(self: *Response, status: u16) !Writer {
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try self.openInternal(status);
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try self.writer.writeAll("\r\n");
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return self.writer;
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}
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pub fn write(self: *Response, status: u16, body: []const u8) !void {
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try self.openInternal(status);
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if (body.len != 0) {
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try self.writer.print("Content-Length: {}\r\n", .{body.len});
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if (self.headers.get("content-type") == null) {
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try self.writer.writeAll("Content-Type: application/octet-stream\r\n");
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}
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}
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try self.writer.writeAll("\r\n");
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if (body.len != 0) {
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try self.writer.writeAll(body);
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}
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}
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};
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request: Request,
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response: Response,
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allocator: std.mem.Allocator,
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};
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const Route = struct {
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const Segment = union(enum) {
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param: []const u8,
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literal: []const u8,
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};
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const Handler = fn (*Context) callconv(.Async) anyerror!void;
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fn normalize(comptime path: []const u8) []const u8 {
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var arr: [path.len]u8 = undefined;
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var i = 0;
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for (path) |ch| {
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if (i == 0 and ch == '/') continue;
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if (i > 0 and ch == '/' and arr[i - 1] == '/') continue;
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arr[i] = ch;
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i += 1;
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}
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if (i > 0 and arr[i - 1] == '/') {
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i -= 1;
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}
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return arr[0..i];
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}
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fn parseSegments(comptime path: []const u8) []const Segment {
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var count = 1;
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for (path) |ch| {
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if (ch == '/') count += 1;
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}
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var segment_array: [count]Segment = undefined;
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var segment_start = 0;
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for (segment_array) |*seg| {
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var index = segment_start;
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while (index < path.len) : (index += 1) {
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if (path[index] == '/') {
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break;
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}
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}
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const slice = path[segment_start..index];
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if (slice.len > 0 and slice[0] == ':') {
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// doing this kinda jankily to get around segfaults in compiler
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const param = path[segment_start + 1 .. index];
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seg.* = .{ .param = param };
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} else {
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seg.* = .{ .literal = slice };
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}
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segment_start = index + 1;
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}
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return &segment_array;
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}
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pub fn from(method: Method, comptime path: []const u8, handler: Handler) Route {
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const segments = parseSegments(normalize(path));
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return Route{ .method = method, .path = segments, .handler = handler };
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}
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fn nextSegment(path: []const u8) ?[]const u8 {
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var start: usize = 0;
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var end: usize = start;
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while (end < path.len) : (end += 1) {
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// skip leading slash
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if (end == start and path[start] == '/') {
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start += 1;
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continue;
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} else if (path[end] == '/') {
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break;
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}
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}
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if (start == end) return null;
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return path[start..end];
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}
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pub fn matches(self: Route, path: []const u8) bool {
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var segment_start: usize = 0;
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for (self.path) |seg| {
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var index = segment_start;
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while (index < path.len) : (index += 1) {
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// skip leading slash
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if (index == segment_start and path[index] == '/') {
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segment_start += 1;
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continue;
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} else if (path[index] == '/') {
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break;
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}
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}
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const slice = path[segment_start..index];
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const match = switch (seg) {
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.literal => |str| areStringsEqual(slice, str),
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.param => true,
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};
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if (!match) return false;
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segment_start = index + 1;
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}
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// check for trailing path
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while (segment_start < path.len) : (segment_start += 1) {
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if (path[segment_start] != '/') return false;
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}
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return true;
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}
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pub fn arg(self: Route, name: []const u8, path: []const u8) []const u8 {
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var index: usize = 0;
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for (self.path) |seg| {
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const slice = nextSegment(path[index..]);
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if (slice == null) return "";
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index = @ptrToInt(slice.?.ptr) - @ptrToInt(path.ptr) + slice.?.len + 1;
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switch (seg) {
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.param => |param| {
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if (areStringsEqual(param, name)) {
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return slice.?;
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}
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},
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.literal => continue,
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}
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}
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std.log.err("unknown parameter {s}", .{name});
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return "";
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}
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method: Method,
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path: []const Segment,
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handler: Handler,
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};
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fn handleNotFound(ctx: *Context) !void {
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try ctx.response.writer.writeAll("HTTP/1.1 404 Not Found\r\n\r\n");
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}
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fn routeRequest(ctx: *Context) !void {
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for (routes) |*route| {
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if (route.method == ctx.request.method and route.matches(ctx.request.path)) {
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std.log.info("{s} {s}", .{ @tagName(ctx.request.method), ctx.request.path });
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ctx.request.route = route;
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var buf = try ctx.allocator.allocWithOptions(u8, @frameSize(route.handler), 8, null);
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defer ctx.allocator.free(buf);
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return await @asyncCall(buf, {}, route.handler, .{ctx});
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}
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}
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std.log.info("404 {s} {s}", .{ @tagName(ctx.request.method), ctx.request.path });
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try handleNotFound(ctx);
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}
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const routes = [_]Route{
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Route.from(.GET, "/", staticString("Index Page")),
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Route.from(.GET, "/test", staticString("some test value idfk")),
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Route.from(.GET, "/objs/:id/get", getObjIdGet),
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Route.from(.POST, "/form/submit", staticString("form submit accepted")),
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};
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fn staticString(comptime str: []const u8) Route.Handler {
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return (struct {
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fn func(ctx: *Context) anyerror!void {
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try ctx.response.headers.put("content-type", "text/plain");
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try ctx.response.write(200, str);
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}
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}).func;
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}
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fn getObjIdGet(ctx: *Context) anyerror!void {
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try ctx.response.headers.put("content-type", "text/plain");
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var writer = try ctx.response.open(200);
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try writer.print("object id {s}", .{ctx.request.arg("id")});
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}
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pub fn main() anyerror!void {
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var srv = std.net.StreamServer.init(.{ .reuse_address = true });
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defer srv.deinit();
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try srv.listen(std.net.Address.parseIp("0.0.0.0", 8080) catch unreachable);
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while (true) {
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const conn = try srv.accept();
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// todo: keep track of connections
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_ = async handleConnection(conn);
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}
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||||
}
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||||
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