Create router.zig
This commit is contained in:
parent
40cad8287a
commit
6a37685643
3 changed files with 172 additions and 164 deletions
165
src/http.zig
165
src/http.zig
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@ -4,6 +4,7 @@ const root = @import("root");
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const ciutf8 = root.ciutf8;
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const Reader = std.net.Stream.Reader;
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const Writer = std.net.Stream.Writer;
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const Route = root.router.Route;
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const HeaderMap = std.HashMap([]const u8, []const u8, struct {
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pub fn eql(_: @This(), a: []const u8, b: []const u8) bool {
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@ -186,7 +187,7 @@ fn handleHttpRequest(reader: Reader, writer: Writer) anyerror!void {
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.allocator = allocator,
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};
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try routeRequest(&context);
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try root.router.routeRequest(&context);
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}
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pub const Context = struct {
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@ -263,165 +264,3 @@ pub const Context = struct {
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response: Response,
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allocator: std.mem.Allocator,
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};
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pub 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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pub 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| ciutf8.eql(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 (std.mem.eql(u8, 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 (root.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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@ -3,13 +3,14 @@ const std = @import("std");
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pub const db = @import("./db.zig");
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pub const util = @import("./util.zig");
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pub const http = @import("./http.zig");
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pub const router = @import("./router.zig");
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pub const Uuid = util.Uuid;
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pub const ciutf8 = util.ciutf8;
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pub const io_mode = .evented;
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const Route = http.Route;
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const Route = router.Route;
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pub const routes = [_]Route{
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Route.from(.GET, "/", staticString("Index Page")),
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168
src/router.zig
Normal file
168
src/router.zig
Normal file
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@ -0,0 +1,168 @@
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const std = @import("std");
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const root = @import("root");
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const Context = root.http.Context;
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const Method = root.http.Method;
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const ciutf8 = root.ciutf8;
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pub 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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pub 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| ciutf8.eql(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 (std.mem.eql(u8, 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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pub fn routeRequest(ctx: *Context) !void {
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for (root.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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