From 0736c8a26dbd970670117290baf4a68e430aecaf Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@ashbysoft.com>
Date: Tue, 22 Aug 2023 09:04:23 +0100
Subject: Decouple Router from std.http module In case we want to use it in a
 CGI application :^)

---
 src/zigwebserver.zig | 58 +++++++++++++++++++++-------------------------------
 1 file changed, 23 insertions(+), 35 deletions(-)

diff --git a/src/zigwebserver.zig b/src/zigwebserver.zig
index 2e20382..acf65fb 100644
--- a/src/zigwebserver.zig
+++ b/src/zigwebserver.zig
@@ -64,8 +64,6 @@ pub fn Server(comptime Context: type, comptime Handler: type) type {
     };
 }
 
-const Response = std.http.Server.Response;
-
 pub const Params = std.StringHashMap([]const u8);
 
 /// Routing component for an http server with wildcard matching and parameter
@@ -80,24 +78,22 @@ pub const Params = std.StringHashMap([]const u8);
 /// "/*" -> matches all requests
 /// TODO something clever to parse path parameters into the appropriate types, maybe smth like "/foo/{bar:u32}/baz"
 /// TODO something to handle query parameters and request body too
-pub fn Router(comptime Context: type, comptime ErrorType: type) type {
+pub fn Router(comptime Response: type, comptime Context: type, comptime ErrorType: type) type {
     return struct {
         pub const Handler = struct {
             method: std.http.Method,
             pattern: []const u8,
-            handle_fn: *const fn (res: *Response, ctx: Context, Params) ErrorType!void,
+            handle_fn: *const fn (Response, Context, Params) ErrorType!void,
         };
 
-        handlers: []const Handler,
+        allocator: std.mem.Allocator,
 
-        notfound: *const fn (res: *Response, ctx: Context) ErrorType!void,
+        handlers: []const Handler,
 
-        pub fn handle(self: @This(), res: *Response, ctx: Context) ErrorType!void {
-            // Routing can only happen after we have the headers
-            // It is a programmer error to call this without calling .wait first.
-            if (res.state != .waited) unreachable;
+        notfound: *const fn (Response, Context) ErrorType!void,
 
-            var p = try Path.parse(res.allocator, res.request.target);
+        pub fn handle(self: @This(), res: Response, ctx: Context) ErrorType!void {
+            var p = try Path.parse(self.allocator, res.request.target);
             defer p.deinit();
             const path = p.path;
 
@@ -106,7 +102,7 @@ pub fn Router(comptime Context: type, comptime ErrorType: type) type {
                     continue :handler_loop;
                 }
 
-                var path_params: Params = std.StringHashMap([]const u8).init(res.allocator);
+                var path_params: Params = std.StringHashMap([]const u8).init(self.allocator);
                 defer path_params.deinit();
 
                 var handle_split = std.mem.splitScalar(u8, handler.pattern, '/');
@@ -150,22 +146,29 @@ pub fn Router(comptime Context: type, comptime ErrorType: type) type {
 }
 
 const RouterTest = struct {
+    const TestRequest = struct {
+        method: std.http.Method,
+        target: []const u8,
+    };
+    const TestResponse = struct {
+        request: TestRequest,
+    };
     const TestCtx = struct {};
     const TestErr = error{ TestError, OutOfMemory } || Path.ParseError;
-    const TestRouter = Router(TestCtx, TestErr);
+    const TestRouter = Router(TestResponse, TestCtx, TestErr);
 
     var notfoundinvoked = false;
-    fn notfound(_: *Response, _: TestCtx) TestErr!void {
+    fn notfound(_: TestResponse, _: TestCtx) TestErr!void {
         notfoundinvoked = true;
     }
     var route1invoked = false;
     var route1params: ?Params = null;
-    fn route1(_: *Response, _: TestCtx, p: Params) TestErr!void {
+    fn route1(_: TestResponse, _: TestCtx, p: Params) TestErr!void {
         route1invoked = true;
         route1params = try p.clone();
     }
     var route2invoked = false;
-    fn route2(_: *Response, _: TestCtx, _: Params) TestErr!void {
+    fn route2(_: TestResponse, _: TestCtx, _: Params) TestErr!void {
         route2invoked = true;
     }
     fn reset() void {
@@ -177,35 +180,20 @@ const RouterTest = struct {
     }
 
     fn runTestRouter(handlers: []TestRouter.Handler, target: []const u8) !void {
-        const alloc = std.testing.allocator;
         const ctx = TestCtx{};
-        var buf: [128]u8 = undefined;
-        const req = std.http.Server.Request{
+        const req = TestRequest{
             .method = .GET,
             .target = target,
-            .version = .@"HTTP/1.1",
-            .headers = std.http.Headers.init(alloc),
-            .parser = std.http.protocol.HeadersParser.initStatic(&buf),
-        };
-        const sock = try std.net.tcpConnectToAddress(std.net.Address{ .in = std.net.Ip4Address.init(.{ 127, 0, 0, 1 }, 22) });
-        defer sock.close();
-        const conn = std.http.Server.Connection{
-            .stream = sock,
-            .protocol = .plain,
         };
-        var res = Response{
-            .allocator = alloc,
-            .address = std.net.Address{ .in = std.net.Ip4Address.init(.{ 127, 0, 0, 1 }, 8080) },
-            .connection = conn,
-            .headers = std.http.Headers.init(alloc),
+        var res = TestResponse{
             .request = req,
-            .state = .waited,
         };
         const router = TestRouter{
+            .allocator = std.testing.allocator,
             .handlers = handlers,
             .notfound = notfound,
         };
-        try router.handle(&res, ctx);
+        try router.handle(res, ctx);
     }
 
     // fn hmof(x: []const u8, y: []const u8) std.StringHashMap([]const u8) {
-- 
cgit v1.2.3-ZIG