Major refactor in router.zig
This commit is contained in:
parent
789e9062b2
commit
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1 changed files with 214 additions and 168 deletions
374
src/router.zig
374
src/router.zig
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@ -70,54 +70,117 @@ const RouteSegment = union(enum) {
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param: []const u8,
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param: []const u8,
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};
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};
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fn RouteWithContext(comptime Context: type) type {
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// convention: return HttpError IFF a status you can't handle happens.
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return struct {
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// If status line/headers were written, always return void
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const Self = @This();
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const HttpError = error{Http404};
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pub const Handler = fn (Context) void;
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path_segments: []const RouteSegment,
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fn Route(comptime Context: type) type {
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method: http.Method,
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return fn (Context, http.Method, []const u8) HttpError!void;
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handler: Handler,
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pub fn bind(method: http.Method, comptime path: []const u8, handler: Handler) Self {
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return .{ .method = method, .path_segments = splitRoutePath(path), .handler = handler };
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}
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fn matchesPath(self: *const Self, request_path: []const u8) bool {
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var request_segments = PathIter.from(request_path);
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for (self.path_segments) |route_seg| {
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const request_seg = request_segments.next() orelse return false;
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switch (route_seg) {
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.literal => |lit| {
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if (!ciutf8.eql(lit, request_seg)) return false;
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},
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.param => {},
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}
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}
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return request_segments.next() == null;
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}
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};
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}
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}
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pub fn Router(comptime Context: type) type {
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/// `makeRoute` takes a route definition and a handler of the form `fn(<Context>, <Params>) HttpError`
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/// where `Params` is a struct containing one field of type `[]const u8` for each path parameter
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///
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/// Arguments:
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/// method: The HTTP method to match
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/// path: The path spec to match against. Path segments beginning with a `:` will cause the rest of
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/// the segment to be treated as the name of a path parameter
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/// handler: The code to execute on route match. This must be a function of form `fn(<Context>, <Params>) HttpError!void`
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///
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/// Implicit Arguments:
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/// Context: the type of a user-supplied Context that is passed through the route. typically `http.Context` but
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/// made generic for ease of testing. There are no restrictions on this type
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/// Params: the type of a struct representing the path parameters expressed in `<path>`. This must be
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/// a struct, with a one-one map between fields and path parameters. Each field must be of type
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/// `[]const u8` and it must have the same name as a single path parameter.
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///
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/// Returns:
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/// A new route function of type `fn(<Context>, http.Method, []const u8) ?HttpError`. When called,
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/// this function will test the provided values against its specification. If they match, then
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/// this function will parse path parameters and <handler> will be called with the supplied
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/// context and params. If they do not match, this function will return null
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///
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/// Example:
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/// route(.GET, "/user/:id/followers", struct{
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/// fn getFollowers(ctx: http.Context, params: struct{ id: []const u8 } HttpError { ... }
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/// ).getFollowers)
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///
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fn makeRoute(
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comptime method: http.Method,
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comptime path: []const u8,
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comptime handler: anytype,
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) return_type: {
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const handler_info = @typeInfo(@TypeOf(handler));
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if (handler_info != .Fn) @compileError("Route expects a function");
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break :return_type Route(@typeInfo(@TypeOf(handler)).Fn.args[0].arg_type.?);
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} {
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const handler_args = @typeInfo(@TypeOf(handler)).Fn.args;
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if (handler_args.len != 2) @compileError("handler function must have signature fn(Context, Params) HttpError");
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if (@typeInfo(handler_args[1].arg_type.?) != .Struct) @compileError("Params in handler(Context, Params) must be struct");
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const Context = handler_args[0].arg_type.?;
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const Params = handler_args[1].arg_type.?;
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const params_fields = std.meta.fields(Params);
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var params_field_used = [_]bool{false} ** std.meta.fields(Params).len;
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const segments = splitRoutePath(path);
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for (segments) |seg| {
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if (seg == .param) {
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const found = for (params_fields) |f, i| {
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if (std.mem.eql(u8, seg.param, f.name)) {
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params_field_used[i] = true;
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break true;
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}
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} else false;
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if (!found) @compileError("Params does not contain " ++ seg.param ++ " field");
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}
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}
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for (params_fields) |f, i| {
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if (f.field_type != []const u8) @compileError("Params fields must be []const u8");
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if (!params_field_used[i]) @compileError("Params field " ++ f.name ++ " not found in path");
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}
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return struct {
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fn func(ctx: Context, req_method: http.Method, req_path: []const u8) HttpError!void {
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if (req_method != method) return error.Http404;
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var params: Params = undefined;
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var req_segments = PathIter.from(req_path);
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inline for (segments) |seg| {
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const req_seg = req_segments.next() orelse return error.Http404;
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var match = switch (seg) {
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.literal => |literal| ciutf8.eql(literal, req_seg),
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.param => |param| blk: {
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@field(params, param) = req_seg;
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break :blk true;
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},
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};
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if (!match) return error.Http404;
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}
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if (req_segments.next() != null) return error.Http404;
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return handler(ctx, params);
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}
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}.func;
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}
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pub fn Router(comptime Context: type, comptime routes: []const Route(Context)) type {
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return struct {
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return struct {
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const Self = @This();
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const Self = @This();
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pub const Route = RouteWithContext(Context);
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pub fn dispatch(_: *const Self, method: http.Method, path: []const u8, ctx: Context) HttpError!void {
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for (routes) |r| {
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routes: []const Route,
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return r(ctx, method, path) catch |err| switch (err) {
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route_404: Route.Handler,
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error.Http404 => continue,
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else => err,
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pub fn dispatch(self: *const Self, method: http.Method, path: []const u8, ctx: Context) void {
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};
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for (self.routes) |r| {
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if (method == r.method and r.matchesPath(path)) {
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return r.handler(ctx);
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}
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}
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}
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return self.route_404(ctx);
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return error.Http404;
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}
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}
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};
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};
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}
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}
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@ -175,34 +238,47 @@ const _tests = struct {
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}, segments);
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}, segments);
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}
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}
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test "RouteWithContext(T).matchesPath" {
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fn CallTracker(comptime _uniq: anytype, comptime next: anytype) type {
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const R = RouteWithContext(Context);
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_ = _uniq;
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const r = R.bind(.GET, "/ab/cd", dummyHandler);
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try std.testing.expectEqual(true, r.matchesPath("ab///cd////"));
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var ctx_type: type = undefined;
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try std.testing.expectEqual(true, r.matchesPath("//ab///cd"));
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var args_type: type = undefined;
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try std.testing.expectEqual(true, r.matchesPath("ab/cd"));
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switch (@typeInfo(@TypeOf(next))) {
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try std.testing.expectEqual(true, r.matchesPath("/ab/cd"));
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.Fn => |func| {
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try std.testing.expectEqual(false, r.matchesPath("/a/b/c/d"));
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if (func.args.len != 2) @compileError("next() must take 2 arguments");
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try std.testing.expectEqual(false, r.matchesPath("/aa/aa"));
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try std.testing.expectEqual(false, r.matchesPath(""));
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ctx_type = func.args[0].arg_type.?;
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args_type = func.args[1].arg_type.?;
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//if (@typeInfo(Args) != .Struct) @compileError("second argument to next() must be struct");
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},
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else => @compileError("next must be function"),
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}
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}
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fn CallTracker(comptime _uniq: anytype, comptime next: fn (Context) void) type {
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const Context = ctx_type;
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_ = _uniq;
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const Args = args_type;
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return struct {
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return struct {
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var calls: u32 = 0;
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var calls: u32 = 0;
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var last_arg: ?Context = null;
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fn func(ctx: Context) void {
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var last_ctx: ?Context = null;
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var last_args: ?Args = null;
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fn func(ctx: Context, args: Args) !void {
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calls += 1;
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calls += 1;
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last_arg = ctx;
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last_ctx = ctx;
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return next(ctx);
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last_args = args;
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return next(ctx, args);
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}
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}
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fn expectCalledOnceWith(expected: Context) !void {
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fn expectCalledOnceWith(exp_ctx: Context, exp_args: Args) !void {
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try std.testing.expectEqual(@as(u32, 1), calls);
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try std.testing.expectEqual(@as(u32, 1), calls);
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try std.testing.expectEqual(expected, last_arg.?);
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try std.testing.expectEqual(exp_ctx, last_ctx.?);
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inline for (std.meta.fields(Args)) |f| {
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try std.testing.expectEqualStrings(
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@field(exp_args, f.name),
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@field(last_args.?, f.name),
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);
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}
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}
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}
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fn expectNotCalled() !void {
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fn expectNotCalled() !void {
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@ -211,172 +287,142 @@ const _tests = struct {
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fn reset() void {
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fn reset() void {
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calls = 0;
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calls = 0;
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last_arg = null;
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last_ctx = null;
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last_args = null;
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}
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}
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};
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};
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}
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}
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const Context = u32;
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const TestContext = u32;
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fn dummyHandler(_: Context) void {}
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const DummyArgs = struct {};
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fn dummyHandler(comptime Args: type) type {
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comptime {
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return struct {
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fn func(_: TestContext, _: Args) HttpError!void {}
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};
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}
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}
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test "Router(T).dispatch" {
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test "Router(T).dispatch" {
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const mock_a = CallTracker(.{}, dummyHandler);
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const mock_a = CallTracker(.{}, dummyHandler(DummyArgs).func);
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const mock_b = CallTracker(.{}, dummyHandler);
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const mock_b = CallTracker(.{}, dummyHandler(DummyArgs).func);
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const mock_404 = CallTracker(.{}, dummyHandler);
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const R = Router(Context).Route;
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const routes = comptime [_]Route(TestContext){
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const routes = [_]R{
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makeRoute(.GET, "/a", mock_a.func),
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R.bind(.GET, "/a", mock_a.func),
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makeRoute(.GET, "/b", mock_b.func),
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R.bind(.GET, "/b", mock_b.func),
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};
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};
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const router = Router(Context){ .routes = &routes, .route_404 = mock_404.func };
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const router = Router(TestContext, &routes){};
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router.dispatch(.GET, "/a", 10);
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_ = try router.dispatch(.GET, "/a", 10);
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try mock_a.expectCalledOnceWith(10);
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try mock_a.expectCalledOnceWith(10, .{});
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try mock_b.expectNotCalled();
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try mock_b.expectNotCalled();
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try mock_404.expectNotCalled();
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mock_a.reset();
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mock_a.reset();
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router.dispatch(.GET, "/b", 0);
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_ = try router.dispatch(.GET, "/b", 0);
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try mock_a.expectNotCalled();
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try mock_a.expectNotCalled();
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try mock_b.expectCalledOnceWith(0);
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try mock_b.expectCalledOnceWith(0, .{});
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try mock_404.expectNotCalled();
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mock_b.reset();
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}
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test "Router(T).dispatch 404" {
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try std.testing.expectError(error.Http404, router.dispatch(.GET, "/c", 0));
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const mock_a = CallTracker(.{}, dummyHandler);
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const mock_b = CallTracker(.{}, dummyHandler);
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const mock_404 = CallTracker(.{}, dummyHandler);
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const R = Router(Context).Route;
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const routes = [_]R{
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R.bind(.GET, "/a", mock_a.func),
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R.bind(.GET, "/b", mock_b.func),
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};
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const router = Router(Context){ .routes = &routes, .route_404 = mock_404.func };
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router.dispatch(.GET, "/c", 10);
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try mock_a.expectNotCalled();
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try mock_b.expectNotCalled();
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try mock_404.expectCalledOnceWith(10);
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mock_404.reset();
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router.dispatch(.POST, "/a", 10);
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try mock_a.expectNotCalled();
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try mock_b.expectNotCalled();
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try mock_404.expectCalledOnceWith(10);
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}
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}
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test "Router(T).dispatch same path different methods" {
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test "Router(T).dispatch same path different methods" {
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const mock_get = CallTracker(.{}, dummyHandler);
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const mock_get = CallTracker(.{}, dummyHandler(DummyArgs).func);
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const mock_post = CallTracker(.{}, dummyHandler);
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const mock_post = CallTracker(.{}, dummyHandler(DummyArgs).func);
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const mock_404 = CallTracker(.{}, dummyHandler);
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const R = Router(Context).Route;
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const routes = comptime [_]Route(TestContext){
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const routes = [_]R{
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makeRoute(.GET, "/a", mock_get.func),
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R.bind(.GET, "/a", mock_get.func),
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makeRoute(.POST, "/a", mock_post.func),
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R.bind(.POST, "/a", mock_post.func),
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};
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};
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const router = Router(Context){ .routes = &routes, .route_404 = mock_404.func };
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const router = Router(TestContext, &routes){};
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router.dispatch(.GET, "/a", 10);
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_ = try router.dispatch(.GET, "/a", 10);
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try mock_get.expectCalledOnceWith(10);
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try mock_get.expectCalledOnceWith(10, .{});
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try mock_post.expectNotCalled();
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try mock_post.expectNotCalled();
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try mock_404.expectNotCalled();
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mock_get.reset();
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mock_get.reset();
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router.dispatch(.POST, "/a", 10);
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_ = try router.dispatch(.POST, "/a", 10);
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try mock_get.expectNotCalled();
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try mock_get.expectNotCalled();
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try mock_post.expectCalledOnceWith(10);
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try mock_post.expectCalledOnceWith(10, .{});
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try mock_404.expectNotCalled();
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}
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}
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test "Router(T).dispatch route under subpath" {
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test "Router(T).dispatch route under subpath" {
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const mock_a = CallTracker(.{}, dummyHandler);
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const mock_a = CallTracker(.{}, dummyHandler(DummyArgs).func);
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const mock_b = CallTracker(.{}, dummyHandler);
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const mock_b = CallTracker(.{}, dummyHandler(DummyArgs).func);
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const mock_404 = CallTracker(.{}, dummyHandler);
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const R = Router(Context).Route;
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const routes = comptime [_]Route(TestContext){
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const routes = [_]R{
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makeRoute(.GET, "/a", mock_a.func),
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R.bind(.GET, "/a", mock_a.func),
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makeRoute(.GET, "/a/b", mock_b.func),
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R.bind(.GET, "/a/b", mock_b.func),
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};
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};
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const router = Router(Context){ .routes = &routes, .route_404 = mock_404.func };
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const router = Router(TestContext, &routes){};
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router.dispatch(.GET, "/a", 10);
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_ = try router.dispatch(.GET, "/a", 10);
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try mock_a.expectCalledOnceWith(10);
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try mock_a.expectCalledOnceWith(10, .{});
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try mock_b.expectNotCalled();
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try mock_b.expectNotCalled();
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try mock_404.expectNotCalled();
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mock_a.reset();
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mock_a.reset();
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router.dispatch(.GET, "/a/b", 11);
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_ = try router.dispatch(.GET, "/a/b", 11);
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try mock_a.expectNotCalled();
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try mock_a.expectNotCalled();
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try mock_b.expectCalledOnceWith(11);
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try mock_b.expectCalledOnceWith(11, .{});
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try mock_404.expectNotCalled();
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}
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}
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test "Router(T).dispatch case-insensitive route" {
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test "Router(T).dispatch case-insensitive route" {
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const mock_a = CallTracker(.{}, dummyHandler);
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const mock_a = CallTracker(.{}, dummyHandler(DummyArgs).func);
|
||||||
const mock_404 = CallTracker(.{}, dummyHandler);
|
|
||||||
|
|
||||||
const R = Router(Context).Route;
|
const routes = comptime [_]Route(TestContext){
|
||||||
const routes = [_]R{
|
makeRoute(.GET, "/test/a", mock_a.func),
|
||||||
R.bind(.GET, "/test/a", mock_a.func),
|
|
||||||
};
|
};
|
||||||
|
|
||||||
const router = Router(Context){ .routes = &routes, .route_404 = mock_404.func };
|
const router = Router(TestContext, &routes){};
|
||||||
router.dispatch(.GET, "/TEST/A", 10);
|
_ = try router.dispatch(.GET, "/TEST/A", 10);
|
||||||
try mock_a.expectCalledOnceWith(10);
|
try mock_a.expectCalledOnceWith(10, .{});
|
||||||
try mock_404.expectNotCalled();
|
|
||||||
mock_a.reset();
|
mock_a.reset();
|
||||||
|
|
||||||
router.dispatch(.GET, "/TesT/a", 11);
|
_ = try router.dispatch(.GET, "/TesT/a", 11);
|
||||||
try mock_a.expectCalledOnceWith(11);
|
try mock_a.expectCalledOnceWith(11, .{});
|
||||||
try mock_404.expectNotCalled();
|
|
||||||
}
|
}
|
||||||
|
|
||||||
test "Router(T).dispatch redundant /" {
|
test "Router(T).dispatch redundant /" {
|
||||||
const mock_a = CallTracker(.{}, dummyHandler);
|
const mock_a = CallTracker(.{}, dummyHandler(DummyArgs).func);
|
||||||
const mock_404 = CallTracker(.{}, dummyHandler);
|
|
||||||
|
|
||||||
const R = Router(Context).Route;
|
const routes = comptime [_]Route(TestContext){
|
||||||
const routes = [_]R{
|
makeRoute(.GET, "/test/a", mock_a.func),
|
||||||
R.bind(.GET, "/test/a", mock_a.func),
|
|
||||||
};
|
};
|
||||||
|
|
||||||
const router = Router(Context){ .routes = &routes, .route_404 = mock_404.func };
|
const router = Router(TestContext, &routes){};
|
||||||
router.dispatch(.GET, "/test//a", 10);
|
_ = try router.dispatch(.GET, "/test//a", 10);
|
||||||
try mock_a.expectCalledOnceWith(10);
|
try mock_a.expectCalledOnceWith(10, .{});
|
||||||
try mock_404.expectNotCalled();
|
|
||||||
mock_a.reset();
|
mock_a.reset();
|
||||||
|
|
||||||
router.dispatch(.GET, "/test/a/", 11);
|
_ = try router.dispatch(.GET, "//test///////////a////", 11);
|
||||||
try mock_a.expectCalledOnceWith(11);
|
try mock_a.expectCalledOnceWith(11, .{});
|
||||||
try mock_404.expectNotCalled();
|
|
||||||
mock_a.reset();
|
mock_a.reset();
|
||||||
|
|
||||||
router.dispatch(.GET, "test/a/", 12);
|
_ = try router.dispatch(.GET, "test/a", 12);
|
||||||
try mock_a.expectCalledOnceWith(12);
|
try mock_a.expectCalledOnceWith(12, .{});
|
||||||
try mock_404.expectNotCalled();
|
|
||||||
}
|
}
|
||||||
|
|
||||||
test "Router(T).dispatch with variables" {
|
test "Router(T).dispatch with variables" {
|
||||||
const mock_a = CallTracker(.{}, dummyHandler);
|
const mock_a = CallTracker(.{}, dummyHandler(struct { id: []const u8 }).func);
|
||||||
const mock_404 = CallTracker(.{}, dummyHandler);
|
const mock_b = CallTracker(.{}, dummyHandler(struct { a_id: []const u8, b_id: []const u8 }).func);
|
||||||
|
|
||||||
const R = Router(Context).Route;
|
const routes = comptime [_]Route(TestContext){
|
||||||
const routes = [_]R{
|
makeRoute(.GET, "/test/:id/abcd", mock_a.func),
|
||||||
R.bind(.GET, "/test/:id/abcd", mock_a.func),
|
makeRoute(.GET, "/test/:a_id/abcd/:b_id", mock_b.func),
|
||||||
};
|
};
|
||||||
|
|
||||||
const router = Router(Context){ .routes = &routes, .route_404 = mock_404.func };
|
const router = Router(TestContext, &routes){};
|
||||||
router.dispatch(.GET, "/test/lskdjflsdjfksld/abcd", 10);
|
_ = try router.dispatch(.GET, "/test/xyz/abcd", 10);
|
||||||
try mock_a.expectCalledOnceWith(10);
|
try mock_a.expectCalledOnceWith(10, .{ .id = "xyz" });
|
||||||
try mock_404.expectNotCalled();
|
try mock_b.expectNotCalled();
|
||||||
mock_a.reset();
|
mock_a.reset();
|
||||||
|
|
||||||
router.dispatch(.GET, "/test//abcd", 10);
|
try std.testing.expectError(error.Http404, router.dispatch(.GET, "/test//abcd", 10));
|
||||||
try mock_a.expectNotCalled();
|
try mock_a.expectNotCalled();
|
||||||
try mock_404.expectCalledOnceWith(10);
|
try mock_b.expectNotCalled();
|
||||||
|
|
||||||
|
_ = try router.dispatch(.GET, "/test/xyz/abcd/zyx", 10);
|
||||||
|
try mock_a.expectNotCalled();
|
||||||
|
try mock_b.expectCalledOnceWith(10, .{ .a_id = "xyz", .b_id = "zyx" });
|
||||||
}
|
}
|
||||||
};
|
};
|
||||||
|
|
|
||||||
Loading…
Reference in a new issue