added json example

build.zig

@@ -22,6 +22,7 @@ pub fn build(b: *std.build.Builder) !void {
         .{ .name = "hello2", .src = "examples/hello2/hello2.zig" },
         .{ .name = "routes", .src = "examples/routes/routes.zig" },
         .{ .name = "serve", .src = "examples/serve/serve.zig" },
+        .{ .name = "hello_json", .src = "examples/hello_json/hello_json.zig" },
     }) |excfg| {
         const ex_name = excfg.name;
         const ex_src = excfg.src;

examples/hello_json/hello_json.zig

@@ -0,0 +1,74 @@
+const std = @import("std");
+const zap = @import("zap");
+
+const User = struct {
+    first_name: ?[]const u8 = null,
+    last_name: ?[]const u8 = null,
+};
+
+fn on_request(r: zap.SimpleRequest) void {
+    if (!std.mem.eql(u8, r.method.?, "GET"))
+        return;
+
+    // /user/n
+    if (r.path) |the_path| {
+        if (the_path.len < 7 or !std.mem.startsWith(u8, the_path, "/user/"))
+            return;
+
+        const user_id: usize = @intCast(usize, the_path[6] - 0x30);
+        const user = users.get(user_id);
+
+        var json_to_send: []const u8 = undefined;
+        if (JsonHelper.stringify(user, .{})) |json| {
+            json_to_send = json;
+        } else {
+            json_to_send = "null";
+        }
+        std.debug.print("<< json: {s}\n", .{json_to_send});
+        r.setContentType(.JSON);
+        _ = r.sendBody(json_to_send);
+    }
+}
+
+const UserMap = std.AutoHashMap(usize, User);
+
+var users: UserMap = undefined;
+fn setupUserData(a: std.mem.Allocator) !void {
+    users = UserMap.init(a);
+    try users.put(1, .{ .first_name = "renerocksai" });
+    try users.put(2, .{ .first_name = "Your", .last_name = "Mom" });
+}
+
+const JsonHelper = struct {
+    // "static" instance of buffer
+    var buf: [100]u8 = undefined;
+    var fba = std.heap.FixedBufferAllocator.init(&buf);
+
+    fn stringify(value: anytype, options: std.json.StringifyOptions) ?[]const u8 {
+        var string = std.ArrayList(u8).init(fba.allocator());
+        if (std.json.stringify(value, options, string.writer())) {
+            return string.items;
+        } else |_| { // error
+            return null;
+        }
+    }
+};
+
+pub fn main() !void {
+    var a = std.heap.page_allocator;
+    try setupUserData(a);
+    var listener = zap.SimpleHttpListener.init(.{
+        .port = 3000,
+        .on_request = on_request,
+        .log = false,
+    });
+    try listener.listen();
+
+    std.debug.print("Listening on 0.0.0.0:3000\n", .{});
+
+    // start worker threads
+    zap.start(.{
+        .threads = 2,
+        .workers = 2,
+    });
+}

src/deps/zap.zig

@@ -7,16 +7,28 @@ pub const C = @cImport({
     @cInclude("fio.h");
 });
 
-pub fn start(args: C.fio_start_args) void {
-    C.fio_start(args);
-}
-
 pub fn fio2str(o: C.FIOBJ) ?[]const u8 {
     if (o == 0) return null;
     const x: C.fio_str_info_s = C.fiobj_obj2cstr(o);
     return std.mem.span(x.data);
 }
 
+pub fn str2fio(s: []const u8) C.fio_str_info_s {
+    return .{
+        .data = toCharPtr(s),
+        .len = s.len,
+        .capa = s.len,
+    };
+}
+
+fn toCharPtr(s: []const u8) [*c]u8 {
+    return @intToPtr([*c]u8, @ptrToInt(s.ptr));
+}
+
+pub fn start(args: C.fio_start_args) void {
+    C.fio_start(args);
+}
+
 const ListenError = error{
     ValueNotZeroTerminated,
     AlreadyListening,
@@ -28,6 +40,12 @@ const HttpParam = struct {
     value: []const u8,
 };
 
+const ContentType = enum {
+    TEXT,
+    HTML,
+    JSON,
+};
+
 pub const SimpleRequest = struct {
     path: ?[]const u8,
     query: ?[]const u8,
@@ -44,6 +62,32 @@ pub const SimpleRequest = struct {
         ), body.len);
     }
 
+    pub fn setContentType(self: *const Self, c: ContentType) void {
+        self.setHeader("content-type", switch (c) {
+            .TEXT => "text/plain",
+            .JSON => "application/json",
+            else => "text/html",
+        });
+    }
+
+    pub fn setHeader(self: *const Self, name: []const u8, value: []const u8) void {
+        const hname: C.fio_str_info_s = .{
+            .data = toCharPtr(name),
+            .len = name.len,
+            .capa = name.len,
+        };
+        const vname: C.fio_str_info_s = .{
+            .data = toCharPtr(value),
+            .len = value.len,
+            .capa = value.len,
+        };
+        _ = C.http_set_header2(self.h, hname, vname);
+
+        // Note to self:
+        // const new_fiobj_str = C.fiobj_str_new(name.ptr, name.len);
+        // C.fiobj_free(new_fiobj_str);
+    }
+
     pub fn nextParam(self: *const Self) ?HttpParam {
         if (self.h.*.params == 0) return null;
         var key: C.FIOBJ = undefined;