Start work on middleware api
This commit is contained in:
parent
f457b7a0d6
commit
73f7022d36
4 changed files with 391 additions and 11 deletions
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@ -15,6 +15,8 @@ pub const Response = server.Response;
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pub const Handler = server.Handler;
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pub const Server = server.Server;
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pub const middleware = @import("./middleware.zig");
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pub const Fields = @import("./headers.zig").Fields;
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pub const Protocol = enum {
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345
src/http/middleware.zig
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345
src/http/middleware.zig
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@ -0,0 +1,345 @@
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const std = @import("std");
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const root = @import("root");
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const builtin = @import("builtin");
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const http = @import("./lib.zig");
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const util = @import("util");
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//const query_utils = @import("./query.zig");
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//const json_utils = @import("./json.zig");
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const json_utils = util;
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const query_utils = util;
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fn AddFields(comptime lhs: type, comptime rhs: type) type {
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const Ctx = @Type(.{ .Struct = .{
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.layout = .Auto,
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.fields = std.meta.fields(lhs) ++ std.meta.fields(rhs),
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.decls = &.{},
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.is_tuple = false,
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} });
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return Ctx;
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}
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fn addFields(lhs: anytype, rhs: anytype) AddFields(@TypeOf(lhs), @TypeOf(rhs)) {
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var result: AddFields(@TypeOf(lhs), @TypeOf(rhs)) = undefined;
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inline for (comptime std.meta.fieldNames(@TypeOf(lhs))) |f| @field(result, f) = @field(lhs, f);
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inline for (comptime std.meta.fieldNames(@TypeOf(rhs))) |f| @field(result, f) = @field(rhs, f);
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return result;
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}
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test {
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// apply is a plumbing function that applies a tuple of middlewares in order
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const base = apply(.{
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split_uri,
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mount("/abc"),
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});
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const request = .{ .uri = "/abc/defg/hijkl?some_query=true#section" };
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const response = .{};
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const initial_context = .{};
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try base.handle(request, response, initial_context, {});
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}
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fn ApplyInternal(comptime fields: []const std.builtin.Type.StructField) type {
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if (fields.len == 0) return void;
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return NextHandler(
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fields[0].field_type,
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ApplyInternal(fields[1..]),
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);
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}
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fn applyInternal(middlewares: anytype, comptime fields: []const std.builtin.Type.StructField) ApplyInternal(fields) {
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if (fields.len == 0) return {};
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return .{
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.first = @field(middlewares, fields[0].name),
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.next = applyInternal(middlewares, fields[1..]),
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};
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}
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pub fn apply(middlewares: anytype) ApplyInternal(std.meta.fields(@TypeOf(middlewares))) {
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return applyInternal(middlewares, std.meta.fields(@TypeOf(middlewares)));
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}
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pub fn AddContext(comptime Rhs: type) type {
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return struct {
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values: Rhs,
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pub fn handle(self: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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return next.handle(req, res, addFields(ctx, self.values), {});
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}
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};
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}
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pub fn NextHandler(comptime First: type, comptime Next: type) type {
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return struct {
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first: First,
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next: Next,
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pub fn handle(
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self: @This(),
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req: anytype,
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res: anytype,
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ctx: anytype,
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next: void,
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) !void {
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_ = next;
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return self.first.handle(req, res, ctx, self.next);
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}
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};
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}
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pub fn CatchErrors(comptime ErrorHandler: type) type {
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return struct {
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error_handler: ErrorHandler,
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pub fn handle(self: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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return next.handle(req, res, ctx, {}) catch |err| {
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return self.error_handler.handle(
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req,
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res,
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addFields(ctx, .{ .err = err }),
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next,
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);
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};
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}
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};
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}
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pub fn catchErrors(error_handler: anytype) CatchErrors(@TypeOf(error_handler)) {
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return .{ .error_handler = error_handler };
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}
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pub const default_error_handler = struct {
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fn handle(_: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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_ = next;
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std.log.err("Error {} on uri {s}", .{ ctx.err, req.uri });
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if (!res.was_opened) {
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if (res.open(.internal_server_error)) |stream| {
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defer stream.close();
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stream.finish() catch {};
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}
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}
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// Tell the server to close the connection after this request
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res.should_close = true;
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}
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}{};
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pub const split_uri = struct {
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pub fn handle(_: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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var frag_split = std.mem.split(u8, req.uri, "#");
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const without_fragment = frag_split.first();
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const fragment = frag_split.rest();
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var query_split = std.mem.split(u8, without_fragment, "?");
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const path = query_split.first();
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const query = query_split.rest();
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const added_ctx = .{
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.path = path,
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.query_string = query,
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.fragment_string = fragment,
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};
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return next.handle(
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req,
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res,
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addFields(ctx, added_ctx),
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{},
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);
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}
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}{};
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// helper function for doing route analysis
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fn routeApplies(comptime R: type, req: anytype) bool {
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if (R.method != req.method) return false;
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var path_iter = util.PathIter.from(req.path);
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comptime var route_iter = util.PathIter.from(R.path);
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inline while (comptime route_iter.next()) |route_segment| {
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const path_segment = path_iter.next() orelse return false;
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if (route_segment.len > 0 and route_segment[0] == ':') {
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// Route Argument
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} else {
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if (!std.ascii.eqlIgnoreCase(route_segment, path_segment)) return false;
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}
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}
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if (path_iter.next() != null) return false;
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return true;
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}
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// routes a request to the correct handler based on declared HTTP method and path
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pub fn Router(comptime Routes: []const type) type {
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return struct {
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routes: std.meta.Tuple(Routes),
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pub fn handle(self: @This(), req: anytype, res: anytype, ctx: anytype, next: void) !void {
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_ = next;
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inline for (self.routes) |r| if (routeApplies(@TypeOf(r), req, ctx)) {
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if (r.handle(req, res, ctx, {})) |_| {
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// success!
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return;
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} else |err| switch (err) {
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error.RouteMismatch => {},
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else => return err,
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}
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};
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return error.RouteMismatch;
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}
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};
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}
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pub fn Mount(comptime route: []const u8) type {
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return struct {
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pub fn handle(_: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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var path_iter = util.PathIter.from(ctx.path);
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comptime var route_iter = util.PathIter.from(route);
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var path_unused = ctx.path;
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inline while (comptime route_iter.next()) |route_segment| {
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if (comptime route_segment.len == 0) continue;
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const path_segment = path_iter.next() orelse return error.RouteMismatch;
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path_unused = path_iter.rest();
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if (comptime route_segment[0] == ':') {
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@compileLog("Argument segments cannot be mounted");
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// Route Argument
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} else {
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if (!std.ascii.eqlIgnoreCase(route_segment, path_segment)) return error.RouteMismatch;
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}
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}
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var new_ctx = ctx;
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new_ctx.path = path_unused;
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return next.handle(req, res, new_ctx, {});
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}
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};
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}
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pub fn mount(comptime route: []const u8) Mount(route) {
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return .{};
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}
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pub fn HandleNotFound(comptime NotFoundHandler: type) type {
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return struct {
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not_found: NotFoundHandler,
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pub fn handler(self: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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return next.handler(req, res, ctx, {}) catch |err| switch (err) {
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error.RouteMismatch => return self.not_found.handler(req, res, ctx, {}),
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else => return err,
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};
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}
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};
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}
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fn parsePathArgs(comptime route: []const u8, comptime Args: type, path: []const u8) !Args {
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var args: Args = undefined;
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var path_iter = util.PathIter.from(path);
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comptime var route_iter = util.PathIter.from(route);
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inline while (comptime route_iter.next()) |route_segment| {
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const path_segment = path_iter.next() orelse return error.RouteMismatch;
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if (route_segment.len > 0 and route_segment[0] == ':') {
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// route segment is an argument segment
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const A = @TypeOf(@field(args, route_segment[1..]));
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@field(args, route_segment[1..]) = try parsePathArg(A, path_segment);
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} else {
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if (!std.ascii.eqlIgnoreCase(route_segment, path_segment)) return error.RouteMismatch;
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}
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}
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if (path_iter.next() != null) return error.RouteMismatch;
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return args;
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}
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fn parsePathArg(comptime T: type, segment: []const u8) !T {
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if (T == []const u8) return segment;
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if (comptime std.meta.trait.isContainer(T) and std.meta.trait.hasFn("parse")(T)) return T.parse(segment);
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@compileError("Unsupported Type " ++ @typeName(T));
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}
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pub fn ParsePathArgs(comptime route: []const u8, comptime Args: type) type {
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return struct {
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pub fn handle(_: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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return next.handle(
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req,
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res,
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addFields(ctx, .{ .args = parsePathArgs(route, Args, req.path) }),
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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 BaseContentType = enum {
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json,
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url_encoded,
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octet_stream,
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other,
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};
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fn parseBody(comptime T: type, content_type: BaseContentType, reader: anytype, alloc: std.mem.Allocator) !T {
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const buf = try reader.readAllAlloc(alloc, 1 << 16);
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defer alloc.free(buf);
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switch (content_type) {
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.octet_stream, .json => {
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const body = try json_utils.parse(T, buf, alloc);
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defer json_utils.parseFree(body, alloc);
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return try util.deepClone(alloc, body);
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},
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.url_encoded => return query_utils.parseQuery(alloc, T, buf) catch |err| switch (err) {
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error.NoQuery => error.NoBody,
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else => err,
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},
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else => return error.UnsupportedMediaType,
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}
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}
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fn matchContentType(hdr: ?[]const u8) ?BaseContentType {
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if (hdr) |h| {
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if (std.ascii.eqlIgnoreCase(h, "application/x-www-form-urlencoded")) return .url_encoded;
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if (std.ascii.eqlIgnoreCase(h, "application/json")) return .json;
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if (std.ascii.eqlIgnoreCase(h, "application/octet-stream")) return .octet_stream;
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return .other;
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}
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return null;
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}
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pub fn ParseBody(comptime Body: type) type {
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return struct {
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pub fn handle(_: @This(), req: anytype, res: anytype, ctx: anytype, next: anytype) !void {
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const base_content_type = matchContentType(req.headers.get("Content-Type"));
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var stream = req.body orelse return error.NoBody;
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const body = try parseBody(Body, base_content_type orelse .json, stream.reader(), ctx.allocator);
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defer ctx.allocator.free(body);
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return next.handler(
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req,
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res,
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addFields(ctx, .{ .body = body }),
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);
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}
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};
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}
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pub fn ParseQueryParams(comptime Next: type, comptime QueryParams: type) type {
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return struct {
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next: Next,
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pub fn handler(self: @This(), req: anytype, res: anytype, ctx: anytype) !void {
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const query = try query_utils.parseQuery(ctx.allocator, QueryParams, ctx.query_string);
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defer ctx.allocator.free(query);
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return self.next.handler(
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req,
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res,
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addFields(ctx, .{ .query = query }),
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);
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}
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};
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}
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@ -18,14 +18,36 @@ pub const timelines = @import("./controllers/api/timelines.zig");
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const web = @import("./controllers/web.zig");
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const mdw = http.middleware;
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const router = Router(&.{});
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const not_found = struct {
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pub fn handler(self: @This(), _: anytype, res: anytype, ctx: anytype) !void {
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var headers = http.Fields.init(ctx.allocator);
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defer headers.deinit();
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var stream = try res.open(.not_found, &headers);
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defer stream.close();
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try stream.finish();
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}
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};
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const base_handler = mdw.SplitUri(mdw.CatchErrors(not_found, mdw.DefaultErrorHandler));
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fn ApiCall(comptime Route: type) type {
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return mdw.
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}
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pub fn routeRequest(api_source: anytype, req: *http.Request, res: *http.Response, alloc: std.mem.Allocator) void {
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// TODO: hashmaps?
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var response = Response{ .headers = http.Fields.init(alloc), .res = res };
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defer response.headers.deinit();
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base_handler
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//var response = Response{ .headers = http.Fields.init(alloc), .res = res };
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//defer response.headers.deinit();
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const found = routeRequestInternal(api_source, req, &response, alloc);
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//const found = routeRequestInternal(api_source, req, &response, alloc);
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if (!found) response.status(.not_found) catch {};
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//if (!found) response.status(.not_found) catch {};
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}
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fn routeRequestInternal(api_source: anytype, req: *http.Request, res: *Response, alloc: std.mem.Allocator) bool {
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@ -49,19 +49,30 @@ pub const QueryIter = struct {
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pub const PathIter = struct {
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is_first: bool,
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iter: Separator('/'),
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iter: std.mem.SplitIterator(u8),
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pub fn from(path: []const u8) PathIter {
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return .{ .is_first = true, .iter = Separator('/').from(path) };
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return .{ .is_first = true, .iter = std.mem.split(u8, path, "/") };
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}
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pub fn next(self: *PathIter) ?[]const u8 {
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if (self.is_first) {
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self.is_first = false;
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return self.iter.next() orelse "";
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}
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defer self.is_first = false;
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while (self.iter.next()) |it| if (it.len != 0) {
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return it;
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};
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return self.iter.next();
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if (self.is_first) return self.iter.rest();
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return null;
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}
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pub fn first(self: *PathIter) []const u8 {
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std.debug.assert(self.is_first);
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return self.next().?;
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}
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pub fn rest(self: *PathIter) []const u8 {
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return self.iter.rest();
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}
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};
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