update todo.md

[chirp] / src / main.zig

diff --git a/src/main.zig b/src/main.zig
index 1871dcca46f6d902ac2121f547850bccdf4a0b8b..f5e66ea54fc0d264251b26eba1081b92bf26a959 100644 (file)
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,135 +1,191 @@
 const std = @import("std");
 const lmdb = @import("lmdb");
 const std = @import("std");
 const lmdb = @import("lmdb");

+const http = @import("http");

 
 // db {{{
 
 
 // db {{{
 

-const Db = struct {
-    const Self = @This();
+const Prng = struct {
+    var prng: std.Random.DefaultPrng = std.Random.DefaultPrng.init(0);

 
 

-    env: ?*lmdb.MDB_env = undefined,
-    txn: ?*lmdb.MDB_txn = undefined,
-    dbi: lmdb.MDB_dbi = undefined,
-    prng: std.Random.DefaultPrng = std.Random.DefaultPrng.init(0),
+    fn IdType(comptime T: type) type {
+        const ti = @typeInfo(@TypeOf(T.get));
+        return ti.Fn.params[1].type.?;
+    }

 
 

-    pub fn gen_id(self: *Self) Id {
-        var id = self.prng.next();
+    pub fn gen_id(dbi: anytype) IdType(@TypeOf(dbi)) {
+        var id: IdType(@TypeOf(dbi)) = @enumFromInt(Prng.prng.next());

 
 

-        while (self.has(id)) {
-            id = self.prng.next();
+        while (dbi.has(id)) {
+            id = @enumFromInt(Prng.prng.next());

         }
 
         return id;
     }
 
         }
 
         return id;
     }
 

-    pub fn open(self: *Self, name: [*c]const u8) void {
-        _ = lmdb.mdb_env_create(&self.env);
-        _ = lmdb.mdb_env_set_maxdbs(self.env, 10);
-        _ = lmdb.mdb_env_set_mapsize(self.env, 1024 * 1024 * 1);
-        _ = lmdb.mdb_env_open(self.env, name, lmdb.MDB_WRITEMAP, 0o664);
-        // _ = lmdb.mdb_env_open(self.env, name, lmdb.MDB_NOSYNC | lmdb.MDB_WRITEMAP, 0o664);
+    pub fn gen_str(dbi: anytype, comptime len: usize) [len]u8 {
+        var buf: [len / 2]u8 = undefined;
+        var res: [len]u8 = undefined;
+        Prng.prng.fill(&buf);
+        for (0..len / 2) |i| {
+            res[i * 2 + 0] = 'a' + (buf[i] % 16);
+            res[i * 2 + 1] = 'a' + (buf[i] >> 4 % 16);
+        }
+
+        while (dbi.has(res)) {
+            Prng.prng.fill(&buf);
+            for (0..len / 2) |i| {
+                res[i * 2 + 0] = 'a' + (buf[i] % 16);
+                res[i * 2 + 1] = 'a' + (buf[i] >> 4 % 16);
+            }
+        }
+
+        return res;

     }
     }

+};

 
 

-    pub fn close(self: *Self) void {
-        lmdb.mdb_env_close(self.env);
+const Db = struct {
+    fn Key(types: anytype) type {
+        return std.meta.Tuple(&types);
+    }
+    fn users(txn: *const lmdb.Txn) !lmdb.Dbi(UserId, User) {
+        return try txn.dbi("users", UserId, User);
+    }
+    fn user_ids(txn: *const lmdb.Txn) !lmdb.Dbi(Username, UserId) {
+        return try txn.dbi("user_ids", Username, UserId);
+    }
+    fn sessions(txn: *const lmdb.Txn) !lmdb.Dbi(SessionToken, UserId) {
+        return try txn.dbi("sessions", SessionToken, UserId);
+    }
+    fn posts(txn: *const lmdb.Txn) !lmdb.Dbi(PostId, Post) {
+        return try txn.dbi("posts", PostId, Post);
+    }
+    fn lists(txn: *const lmdb.Txn, comptime T: type) !lmdb.Dbi(ListId, ListNode(T)) {
+        return try txn.dbi("lists", ListId, ListNode(T));
+    }
+    fn sets(txn: *const lmdb.Txn, comptime T: type) !lmdb.Dbi(Key(.{ SetId, T }), u0) {
+        return try txn.dbi("sets", Key(.{ SetId, T }), u0);

     }
 
     }
 

-    pub fn begin(self: *Self, name: [*c]const u8) void {
-        switch (lmdb.mdb_txn_begin(self.env, null, 0, &self.txn)) {
-            0 => {},
-            else => |err| {
-                std.debug.print("txn err: {}\n", .{err});
-            },
-        }
+    const ListId = enum(u64) { _ };

 
 

-        // TODO: lmdb.MDB_INTEGERKEY?
-        _ = lmdb.mdb_dbi_open(self.txn, name, lmdb.MDB_CREATE, &self.dbi);
+    pub fn ListNode(comptime T: type) type {
+        return struct {
+            next: ?ListId,
+            prev: ?ListId,
+            data: T,
+        };

     }
 
     }
 

-    pub fn commit(self: *Self) void {
-        switch (lmdb.mdb_txn_commit(self.txn)) {
-            0 => {},
-            lmdb.MDB_MAP_FULL => {
-                std.debug.print("resize\n", .{});
-                _ = lmdb.mdb_env_set_mapsize(self.env, 0);
-            },
-            else => |err| {
-                std.debug.print("commit err: {}\n", .{err});
-            },
-        }
+    pub fn List(comptime T: type) type {
+        return struct {
+            const Self = @This();

 
 

-        // TODO: necessary?
-        lmdb.mdb_dbi_close(self.env, self.dbi);
-    }
+            first: ListId = undefined,
+            last: ListId = undefined,
+            len: usize = 0,

 
 

-    pub fn sync(self: *Self) void {
-        switch (lmdb.mdb_env_sync(self.env, 1)) {
-            0 => {},
-            else => |err| {
-                std.debug.print("sync err: {}\n", .{err});
-            },
-        }
-    }
+            pub const Iterator = struct {
+                dbi: lmdb.Dbi(ListId, ListNode(T)),
+                id_maybe: ?ListId,

 
 

-    pub fn put(self: *Self, key: anytype, value: anytype) void {
-        lmdb.put(self.txn, self.dbi, key, value);
-    }
+                pub fn next(self: *Iterator) ?T {
+                    const id = self.id_maybe orelse return null;

 
 

-    pub fn get(self: *Self, key: anytype, comptime T: type) ?T {
-        return lmdb.get(self.txn, self.dbi, key, T);
+                    // TODO: how to handle this?
+                    const ln = self.dbi.get(id) orelse return null;
+                    self.id_maybe = ln.next;
+                    return ln.data;
+                }
+            };
+            pub fn it(self: *const Self, txn: *const lmdb.Txn) !Iterator {
+                const list = try Db.lists(txn, T);
+                return .{ .dbi = list, .id_maybe = if (self.len > 0) self.first else null };
+            }
+            pub fn append(self: *Self, txn: *const lmdb.Txn, t: T) !void {
+                const list = try Db.lists(txn, T);
+                const new_id = Prng.gen_id(list);
+
+                if (self.len == 0) {
+                    self.first = new_id;
+                    self.last = new_id;
+                    self.len = 1;
+                    list.put(new_id, .{
+                        .next = null,
+                        .prev = null,
+                        .data = t,
+                    });
+                } else {
+                    const prev_id = self.last;
+                    var last = list.get(prev_id).?;
+                    last.next = new_id;
+                    list.put(prev_id, last);
+
+                    list.put(new_id, .{
+                        .next = null,
+                        .prev = prev_id,
+                        .data = t,
+                    });
+
+                    self.last = new_id;
+                    self.len += 1;
+                }
+            }
+        };

     }
 
     }
 

-    pub fn del(self: *Self, key: anytype) void {
-        lmdb.del(self.txn, self.dbi, key);
-    }
+    const SetId = enum(u64) { _ };

 
 

-    pub fn has(self: *Self, key: anytype) bool {
-        return lmdb.has(self.txn, self.dbi, key);
-    }
-};
+    pub fn Set(comptime T: type) type {
+        return struct {
+            const Self = @This();
+            const SetKey = Key(.{ SetId, T });

 
 

-// }}}
+            len: usize = 0,
+            set_id: ?SetId = null,

 
 

-// http stuff {{{
+            pub fn init(self: *Self) void {
+                self.set_id = @enumFromInt(Prng.prng.next());
+            }

 
 

-pub fn redirect(req: *std.http.Server.Request, location: []const u8) !void {
-    try req.respond("", .{ .status = .see_other, .extra_headers = &.{.{ .name = "Location", .value = location }} });
-}
+            pub fn has(self: Self, txn: *const lmdb.Txn, t: T) !bool {
+                if (self.set_id == null) return false;

 
 

-pub fn get_body(req: *std.http.Server.Request) []const u8 {
-    return req.server.read_buffer[req.head_end .. req.head_end + (req.head.content_length orelse 0)];
-}
+                const set = try Db.sets(txn, T);
+                const key = SetKey{ self.set_id.?, t };

 
 

-pub fn get_value(req: *std.http.Server.Request, name: []const u8) ?[]const u8 {
-    const body = get_body(req);
-    if (std.mem.indexOf(u8, body, name)) |name_index| {
-        if (std.mem.indexOfScalarPos(u8, body, name_index, '=')) |eql_index| {
-            if (std.mem.indexOfScalarPos(u8, body, name_index, '&')) |amp_index| {
-                return body[eql_index + 1 .. amp_index];
+                return set.has(key);

             }
 
             }
 

-            return body[eql_index + 1 .. body.len];
-        }
-    }
-    return null;
-}
+            pub fn add(self: *Self, txn: *const lmdb.Txn, t: T) !void {
+                if (self.set_id == null) self.init();
+
+                const set = try Db.sets(txn, T);
+                const key = SetKey{ self.set_id.?, t };

 
 

-pub fn get_cookie(req: *std.http.Server.Request, name: []const u8) ?CookieValue {
-    var header_it = req.iterateHeaders();
-    while (header_it.next()) |header| {
-        if (std.mem.eql(u8, header.name, "Cookie")) {
-            if (std.mem.indexOf(u8, header.value, name)) |name_index| {
-                if (std.mem.indexOfScalarPos(u8, header.value, name_index, '=')) |eql_index| {
-                    if (std.mem.indexOfPos(u8, header.value, name_index, "; ")) |semi_index| {
-                        return CookieValue.fromSlice(header.value[eql_index + 1 .. semi_index]) catch null;
+                if (!set.has(key)) {
+                    set.put(key, 0);
+                    if (set.has(key)) {
+                        self.len += 1;

                     }
                     }

+                }
+            }
+
+            pub fn del(self: *Self, txn: *const lmdb.Txn, t: T) !void {
+                if (self.set_id == null) self.init();

 
 

-                    return CookieValue.fromSlice(header.value[eql_index + 1 .. header.value.len]) catch null;
+                const set = try Db.sets(txn, T);
+                const key = SetKey{ self.set_id.?, t };
+
+                if (set.has(key)) {
+                    set.del(key);
+                    if (!set.has(key)) {
+                        self.len -= 1;
+                    }

                 }
             }
                 }
             }

-        }
+        };

     }
     }

-    return null;
-}
+};

 
 // }}}
 
 
 // }}}
 


@@ -137,15 +193,44 @@ pub fn get_cookie(req: *std.http.Server.Request, name: []const u8) ?CookieValue
 
 const User = struct {
     // TODO: choose sizes
 
 const User = struct {
     // TODO: choose sizes

+    id: UserId,

     username: Username,
     password_hash: PasswordHash,
     username: Username,
     password_hash: PasswordHash,

+    posts: PostList = PostList{},
+};
+
+const Post = struct {
+    id: PostId,
+
+    user_id: UserId,
+    time: Timestamp,
+
+    upvotes: UserList = UserList{},
+    downvotes: UserList = UserList{},
+    comments: PostList = PostList{},
+    // reposts
+
+    text: PostText,

 };
 
 };
 

+const SessionTokenLen = 16;
+

 const Id = u64;
 const Id = u64;

+const Login = struct {
+    user: User,
+    user_id: UserId,
+    session_token: SessionToken,
+};
+const UserId = enum(u64) { _ };
+const PostId = enum(u64) { _ };
+const Timestamp = i64;

 const Username = std.BoundedArray(u8, 16);
 const PasswordHash = std.BoundedArray(u8, 128);
 const Username = std.BoundedArray(u8, 16);
 const PasswordHash = std.BoundedArray(u8, 128);

-const SessionToken = u64;
+const SessionToken = [SessionTokenLen]u8;

 const CookieValue = std.BoundedArray(u8, 128);
 const CookieValue = std.BoundedArray(u8, 128);

+const PostText = std.BoundedArray(u8, 1024);
+const PostList = Db.List(PostId);
+const UserList = Db.Set(UserId);

 
 pub fn hash_password(password: []const u8) !PasswordHash {
     var hash_buffer = try PasswordHash.init(128);
 
 pub fn hash_password(password: []const u8) !PasswordHash {
     var hash_buffer = try PasswordHash.init(128);


@@ -180,235 +265,570 @@ pub fn verify_password(password: []const u8, hash: PasswordHash) bool {
     }
 }
 
     }
 }
 

-pub fn register_user(db: *Db, username: []const u8, password: []const u8) !void {
+pub fn register_user(env: *lmdb.Env, username: []const u8, password: []const u8) !bool {

     const username_array = try Username.fromSlice(username);
 
     const username_array = try Username.fromSlice(username);
 

-    db.begin("users");
-    const user_id = db.gen_id();
-    db.put(user_id, User{
-        .username = username_array,
-        .password_hash = try hash_password(password),
-    });
-    db.commit();
+    const txn = try env.txn();
+    defer {
+        txn.commit();
+        env.sync();
+    }

 
 

-    db.begin("ids");
-    db.put(username_array.buffer, user_id);
-    db.commit();
+    const users = try Db.users(&txn);
+    const user_ids = try Db.user_ids(&txn);

 
 

-    std.debug.print("id: {}\n", .{user_id});
+    if (user_ids.has(username_array)) {
+        return false;
+    } else {
+        const user_id = Prng.gen_id(users);
+        users.put(user_id, User{
+            .id = user_id,
+            .username = username_array,
+            .password_hash = try hash_password(password),
+        });
+
+        user_ids.put(username_array, user_id);

 
 

-    db.sync();
+        return true;
+    }

 }
 
 }
 

-pub fn login_user(db: *Db, username: []const u8, password: []const u8) ?SessionToken {
-    const username_array = Username.fromSlice(username) catch return null;
+pub fn login_user(env: *lmdb.Env, username: []const u8, password: []const u8) !SessionToken {
+    const username_array = try Username.fromSlice(username);
+
+    const txn = try env.txn();
+    defer {
+        txn.commit();
+        env.sync();
+    }

 
 

-    db.begin("ids");
-    const user_id = db.get(username_array.buffer, Id) orelse return null;
+    const user_ids = try Db.user_ids(&txn);
+    const user_id = user_ids.get(username_array) orelse return error.UnknownUsername;

     std.debug.print("id: {}\n", .{user_id});
     std.debug.print("id: {}\n", .{user_id});

-    // TODO: maybe no commit?
-    db.commit();

 
 

-    db.begin("users");
-    const user = db.get(user_id, User) orelse return null;
-    db.commit();
+    const users = try Db.users(&txn);
+    if (users.get(user_id)) |user| {
+        if (verify_password(password, user.password_hash)) {
+            const sessions = try Db.sessions(&txn);
+            const session_token = Prng.gen_str(sessions, SessionTokenLen);
+            sessions.put(session_token, user_id);
+            return session_token;
+        } else {
+            return error.IncorrectPassword;
+        }
+    } else {
+        return error.UserNotFound;
+    }
+}
+
+fn logout_user(env: *lmdb.Env, session_token: SessionToken) !void {
+    const txn = try env.txn();
+    defer {
+        txn.commit();
+        env.sync();
+    }
+
+    const sessions = try Db.sessions(&txn);
+    sessions.del(session_token);
+}
+
+fn post(env: *lmdb.Env, user_id: UserId, text: []const u8) !void {
+    var post_id: PostId = undefined;
+
+    var txn = try env.txn();
+    {
+        const posts = try Db.posts(&txn);
+        post_id = Prng.gen_id(posts);
+        posts.put(post_id, Post{
+            .id = post_id,
+            .user_id = user_id,
+            .time = std.time.timestamp(),
+            .text = try PostText.fromSlice(text),
+        });
+
+        txn.commit();
+        env.sync();
+    }
+
+    txn = try env.txn();
+    {
+        const users = try Db.users(&txn);
+        var user = users.get(user_id) orelse return error.UserNotFound;
+        try user.posts.append(&txn, post_id);
+        users.put(user_id, user);
+
+        txn.commit();
+        env.sync();
+    }
+}
+
+fn vote(env: *lmdb.Env, post_id: PostId, user_id: UserId, dir: enum { Up, Down }) !void {
+    const txn = try env.txn();
+    defer {
+        txn.commit();
+        env.sync();
+    }
+
+    const posts = try Db.posts(&txn);

 
 

-    if (verify_password(password, user.password_hash)) {
-        db.begin("sessions");
-        const session_token = db.gen_id();
-        db.put(session_token, user_id);
-        db.commit();
+    var p = posts.get(post_id) orelse return error.PostNotFound;
+    if (dir == .Up) {
+        try p.upvotes.add(&txn, user_id);
+    } else {
+        try p.downvotes.add(&txn, user_id);
+    }
+    posts.put(post_id, p);
+}

 
 

-        db.sync();
+fn unvote(env: *lmdb.Env, post_id: PostId, user_id: UserId, dir: enum { Up, Down }) !void {
+    const txn = try env.txn();
+    defer {
+        txn.commit();
+        env.sync();
+    }

 
 

-        return session_token;
+    const posts = try Db.posts(&txn);
+
+    var p = posts.get(post_id) orelse return error.PostNotFound;
+    if (dir == .Up) {
+        try p.upvotes.del(&txn, user_id);

     } else {
     } else {

-        return null;
+        try p.downvotes.del(&txn, user_id);

     }
     }

+    posts.put(post_id, p);

 }
 
 }
 

-fn logout_user(db: *Db, session_token: SessionToken) void {
-    db.begin("sessions");
-    db.del(session_token);
-    db.commit();
+fn get_session_user_id(env: *lmdb.Env, session_token: SessionToken) !UserId {
+    const txn = try env.txn();
+    defer txn.abort();
+
+    const sessions = try Db.sessions(&txn);
+
+    if (sessions.get(session_token)) |user_id| {
+        return user_id;
+    } else {
+        return error.SessionNotFound;
+    }

 }
 
 }
 

-fn get_session_user(db: *Db, session_token: SessionToken) ?User {
-    db.begin("sessions");
-    const user_id = db.get(session_token, Id) orelse return null;
-    db.commit();
+fn get_user(env: *lmdb.Env, user_id: UserId) !?User {
+    const txn = try env.txn();
+    defer txn.abort();

 
 

-    db.begin("users");
-    const user = db.get(user_id, User) orelse return null;
-    db.commit();
+    const users = try Db.users(&txn);
+    return users.get(user_id);
+}
+
+// }}}
+
+// html {{{
+fn html_form(res: *http.Response, comptime fmt_action: []const u8, args_action: anytype, inputs: anytype) !void {
+    try res.write("<form style=\"display: inline-block!important;\" action=\"", .{});
+    try res.write(fmt_action, args_action);
+    try res.write("\" method=\"post\">", .{});
+
+    inline for (inputs) |input| {
+        switch (@typeInfo(@TypeOf(input))) {
+            .Struct => {
+                try res.write("<input ", .{});
+                try res.write(input[0], input[1]);
+                try res.write(" />", .{});
+            },
+            else => {
+                try res.write("<input ", .{});
+                try res.write(input, .{});
+                try res.write(" />", .{});
+            },
+        }
+    }

 
 

-    return user;
+    try res.write("</form>", .{});

 }
 }

+// }}}

 
 

+// write {{{
+fn write_header(res: *http.Response, logged_in: ?Login) !void {
+    if (logged_in) |login| {
+        try res.write(
+            \\<a href="/user/{s}">Home</a><br />
+        , .{login.user.username.constSlice()});
+        try html_form(res, "/logout", .{}, .{
+            \\type="submit" value="Logout"
+        });
+        try html_form(res, "/quit", .{}, .{
+            \\type="submit" value="Quit"
+        });
+        try res.write("<br />", .{});
+        try html_form(res, "/post", .{}, .{
+            \\type="text" name="text"
+            ,
+            \\type="submit" value="Post"
+        });
+    } else {
+        try res.write(
+            \\<a href="/">Home</a><br />
+            \\<a href="/register">Register</a>
+            \\<a href="/login">Login</a><br />
+        , .{});
+        try html_form(res, "/quit", .{}, .{
+            \\type="submit" value="Quit"
+        });
+    }
+}
+fn write_posts(res: *http.Response, txn: *const lmdb.Txn, user: User, login: ?Login) !void {
+    const posts = try Db.posts(txn);
+    var it = try user.posts.it(txn);
+    while (it.next()) |post_id| {
+        const p = posts.get(post_id) orelse break;
+        try res.write(
+            \\<div>
+            \\<p>{s}</p>
+        , .{p.text.constSlice()});
+        if (login != null and try p.upvotes.has(txn, login.?.user_id)) {
+            try html_form(res, "/unupvote/{}", .{@intFromEnum(post_id)}, .{
+                .{ "type=\"submit\" value=\"&#x2B06; {}\"", .{p.upvotes.len} },
+            });
+        } else {
+            try html_form(res, "/upvote/{}", .{@intFromEnum(post_id)}, .{
+                .{ "type=\"submit\" value=\"&#x2B06; {}\"", .{p.upvotes.len} },
+            });
+        }
+        if (login != null and try p.downvotes.has(txn, login.?.user_id)) {
+            try html_form(res, "/undownvote/{}", .{@intFromEnum(post_id)}, .{
+                .{ "type=\"submit\" value=\"&#x2B07; {}\"", .{p.downvotes.len} },
+            });
+        } else {
+            try html_form(res, "/downvote/{}", .{@intFromEnum(post_id)}, .{
+                .{ "type=\"submit\" value=\"&#x2B07; {}\"", .{p.downvotes.len} },
+            });
+        }
+        try res.write(
+            \\<span>&#x1F4AD; {}</span>
+            \\</div>
+        , .{p.comments.len});
+    }
+}

 // }}}
 
 // }}}
 

-fn list_users(db: *Db) void {
-    _ = lmdb.mdb_txn_begin(db.env, null, 0, &db.txn);
+fn list_users(env: lmdb.Env) !void {
+    const txn = try env.txn();
+    defer txn.abort();
+
+    // const users = try Db.users(&txn);
+    const users = try txn.dbi("users", UserId, User);
+    var cursor = try users.cursor();
+
+    var key: UserId = undefined;
+    var user_maybe = cursor.get(&key, .First);

 
 

-    _ = lmdb.mdb_dbi_open(db.txn, "users", lmdb.MDB_CREATE, &db.dbi);
+    while (user_maybe) |*user| {
+        std.debug.print("[{}] {s}\n", .{ key, user.username.constSlice() });

 
 

-    var cursor: ?*lmdb.MDB_cursor = undefined;
-    _ = lmdb.mdb_cursor_open(db.txn, db.dbi, &cursor);
+        user_maybe = cursor.get(&key, .Next);
+    }
+}
+fn list_user_ids(env: lmdb.Env) !void {
+    const txn = try env.txn();
+    defer txn.abort();

 
 

-    var key: lmdb.MDB_val = undefined;
-    var val: lmdb.MDB_val = undefined;
-    var result = lmdb.mdb_cursor_get(cursor, &key, &val, lmdb.MDB_FIRST);
+    const user_ids = try Db.user_ids(&txn);
+    var cursor = try user_ids.cursor();

 
 

-    while (result != lmdb.MDB_NOTFOUND) {
-        const user_id = @as(*align(1) Id, @ptrCast(key.mv_data.?)).*;
-        const user = @as(*align(1) User, @ptrCast(val.mv_data.?)).*;
+    var key: Username = undefined;
+    var user_id_maybe = cursor.get(&key, .First);

 
 

-        std.debug.print("[{}] {s}\n", .{ user_id, user.username.constSlice() });
+    while (user_id_maybe) |user_id| {
+        std.debug.print("[{s}] {}\n", .{ key.constSlice(), user_id });

 
 

-        result = lmdb.mdb_cursor_get(cursor, &key, &val, lmdb.MDB_NEXT);
+        user_id_maybe = cursor.get(&key, .Next);

     }
     }

+}
+
+fn list_sessions(env: lmdb.Env) !void {
+    const txn = try env.txn();
+    defer txn.abort();
+
+    const sessions = try Db.sessions(&txn);
+    var cursor = try sessions.cursor();

 
 

-    _ = lmdb.mdb_cursor_close(cursor);
+    var key: SessionToken = undefined;
+    var user_id_maybe = cursor.get(&key, .First);

 
 

-    _ = lmdb.mdb_dbi_close(db.env, db.dbi);
+    while (user_id_maybe) |user_id| {
+        std.debug.print("[{s}] {}\n", .{ key, user_id });

 
 

-    _ = lmdb.mdb_txn_commit(db.txn);
+        user_id_maybe = cursor.get(&key, .Next);
+    }

 }
 
 }
 

+fn list_posts(env: lmdb.Env) !void {
+    const txn = try env.txn();
+    defer txn.abort();
+
+    const posts = try Db.posts(&txn);
+    var cursor = try posts.cursor();
+
+    var key: PostId = undefined;
+    var post_maybe = cursor.get(&key, .First);
+
+    while (post_maybe) |p| {
+        std.debug.print("[{}] {s}\n", .{ key, p.text.constSlice() });
+
+        post_maybe = cursor.get(&key, .Next);
+    }
+}
+
+const ReqBufferSize = 4096;
+const ResHeadBufferSize = 1024 * 16;
+const ResBodyBufferSize = 1024 * 16;
+

 pub fn main() !void {
     // server
 pub fn main() !void {
     // server

-    const address = try std.net.Address.resolveIp("::", 8080);
-
-    var server = try address.listen(.{
-        .reuse_address = true,
-    });
+    var server = try http.Server.init("::", 8080);

     defer server.deinit();
 
     // lmdb
     defer server.deinit();
 
     // lmdb

-    var db = Db{};
-    db.open("./db");
-    defer db.close();
+    var env = try lmdb.Env.open("db", 1024 * 1024 * 10);
+    defer env.close();
+
+    std.debug.print("Users:\n", .{});
+    try list_users(env);
+    std.debug.print("User IDs:\n", .{});
+    try list_user_ids(env);
+    std.debug.print("Sessions:\n", .{});
+    try list_sessions(env);
+    std.debug.print("Posts:\n", .{});
+    try list_posts(env);
+
+    try handle_connection(&server, &env);
+    // const ThreadCount = 1;
+    // var ts: [ThreadCount]std.Thread = undefined;
+
+    // for (0..ThreadCount) |i| {
+    //     ts[i] = try std.Thread.spawn(.{}, handle_connection, .{ &server, &env });
+    // }
+    // for (0..ThreadCount) |i| {
+    //     ts[i].join();
+    // }
+
+    std.debug.print("done\n", .{});
+}

 
 

-    list_users(&db);
+fn handle_connection(server: *http.Server, env: *lmdb.Env) !void {
+    // TODO: static?
+    var req_buffer: [ReqBufferSize]u8 = undefined;
+    var res_head_buffer: [ResHeadBufferSize]u8 = undefined;
+    var res_body_buffer: [ResBodyBufferSize]u8 = undefined;

 
     accept: while (true) {
 
     accept: while (true) {

-        const conn = try server.accept();
-
-        std.debug.print("new connection: {}\n", .{conn});
+        server.wait();

 
 

-        var read_buffer: [1024]u8 = undefined;
-        var http_server = std.http.Server.init(conn, &read_buffer);
+        while (try server.next_request(&req_buffer)) |req| {
+            // std.debug.print("[{}]: {s}\n", .{ req.method, req.target });

 
 

-        while (http_server.state == .ready) {
-            var req = http_server.receiveHead() catch continue;
+            // reponse
+            var res = http.Response.init(req.fd, &res_head_buffer, &res_body_buffer);

 
 

-            std.debug.print("[{}]: {s}\n", .{ req.head.method, req.head.target });
+            // check session token
+            var logged_in: ?Login = null;

 
 

-            var logged_in: ?struct {
-                user: User,
-                session_token: SessionToken,
-            } = null;
+            if (req.get_cookie("session_token")) |session_token_str| {
+                var session_token: SessionToken = undefined;
+                std.mem.copyForwards(u8, &session_token, session_token_str);
+                // const session_token = try std.fmt.parseUnsigned(SessionToken, session_token_str, 10);
+                // const session_token = std.mem.bytesToValue(SessionToken, session_token_str);
+                if (get_session_user_id(env, session_token)) |user_id| {
+                    const txn = try env.txn();
+                    defer txn.abort();
+                    const users = try Db.users(&txn);

 
 

-            if (get_cookie(&req, "session_token")) |session_token_str| {
-                const session_token = try std.fmt.parseUnsigned(SessionToken, session_token_str.constSlice(), 10);
-                if (get_session_user(&db, session_token)) |user| {

                     logged_in = .{
                     logged_in = .{

-                        .user = user,
+                        .user = users.get(user_id) orelse return error.UserNotFound,
+                        .user_id = user_id,

                         .session_token = session_token,
                     };
                         .session_token = session_token,
                     };

+                } else |err| {
+                    std.debug.print("get_session_user err: {}\n", .{err});
+
+                    try res.add_header(
+                        "Set-Cookie",
+                        .{"session_token=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT"},
+                    );

                 }
                 }

-                // TODO: delete session token
-                // TODO: add changeable headers (set, delete cookies)

             }
 
             // html
             }
 
             // html

-            if (req.head.method == .GET) {
-                if (std.mem.eql(u8, req.head.target, "/register")) {
-                    try req.respond(
+            if (req.method == .GET) {
+                try write_header(&res, logged_in);
+
+                if (std.mem.eql(u8, req.target, "/register")) {
+                    try res.write(

                         \\<form action="/register" method="post">
                         \\<input type="text" name="username" />
                         \\<input type="password" name="password" />
                         \\<input type="submit" value="Register" />
                         \\</form>
                     , .{});
                         \\<form action="/register" method="post">
                         \\<input type="text" name="username" />
                         \\<input type="password" name="password" />
                         \\<input type="submit" value="Register" />
                         \\</form>
                     , .{});

-                } else if (std.mem.eql(u8, req.head.target, "/login")) {
-                    try req.respond(
+                    try res.send();
+                } else if (std.mem.eql(u8, req.target, "/login")) {
+                    try res.write(

                         \\<form action="/login" method="post">
                         \\<input type="text" name="username" />
                         \\<input type="password" name="password" />
                         \\<input type="submit" value="Login" />
                         \\</form>
                     , .{});
                         \\<form action="/login" method="post">
                         \\<input type="text" name="username" />
                         \\<input type="password" name="password" />
                         \\<input type="submit" value="Login" />
                         \\</form>
                     , .{});

+                    try res.send();
+                } else if (std.mem.startsWith(u8, req.target, "/user/")) {
+                    const username = req.target[6..req.target.len];
+
+                    const txn = try env.txn();
+                    defer txn.abort();
+
+                    const user_ids = try Db.user_ids(&txn);
+                    if (user_ids.get(try Username.fromSlice(username))) |user_id| {
+                        const users = try Db.users(&txn);
+                        const user = users.get(user_id).?;
+                        try write_posts(&res, &txn, user, logged_in);
+                    } else {
+                        try res.write(
+                            \\<p>User not found</pvo>
+                        , .{});
+                    }
+                    try res.send();

                 } else {
                     if (logged_in) |login| {
                 } else {
                     if (logged_in) |login| {

-                        var response_buffer = try std.BoundedArray(u8, 1024).init(0);
-                        try std.fmt.format(response_buffer.writer(),
-                            \\<a href="/user/{s}">Home</a>
-                            \\<form action="/logout" method="post"><input type="submit" value="Logout" /></form>
-                            \\<form action="/quit" method="post"><input type="submit" value="Quit" /></form>
-                        , .{login.user.username.constSlice()});
-                        try req.respond(response_buffer.constSlice(), .{});
+                        const user = (try get_user(env, login.user_id)).?;
+
+                        const txn = try env.txn();
+                        defer txn.abort();
+
+                        try write_posts(&res, &txn, user, logged_in);
+
+                        try res.send();

                     } else {
                     } else {

-                        try req.respond(
-                            \\<a href="/register">Register</a>
-                            \\<a href="/login">Login</a>
-                            \\<form action="/quit" method="post"><input type="submit" value="Quit" /></form>
-                        , .{});
+                        try res.write("[GET] {s}", .{req.target});
+                        try res.send();

                     }
                 }
             }
             // api
             else {
                     }
                 }
             }
             // api
             else {

-                if (std.mem.eql(u8, req.head.target, "/register")) {
+                if (std.mem.eql(u8, req.target, "/register")) {

                     // TODO: handle args not supplied
                     // TODO: handle args not supplied

-                    const username = get_value(&req, "username").?;
-                    const password = get_value(&req, "password").?;
+                    const username = req.get_value("username").?;
+                    const password = req.get_value("password").?;

 
                     std.debug.print("New user: {s} {s}\n", .{ username, password });
 
                     std.debug.print("New user: {s} {s}\n", .{ username, password });

-                    try register_user(&db, username, password);
-
-                    try redirect(&req, "/login");
-                } else if (std.mem.eql(u8, req.head.target, "/login")) {
+                    if (try register_user(env, username, password)) {
+                        try res.redirect("/login");
+                    } else {
+                        try res.redirect("/register");
+                    }
+                    try res.send();
+                } else if (std.mem.eql(u8, req.target, "/login")) {

                     // TODO: handle args not supplied
                     // TODO: handle args not supplied

-                    const username = get_value(&req, "username").?;
-                    const password = get_value(&req, "password").?;
+                    const username = req.get_value("username").?;
+                    const password = req.get_value("password").?;

 
                     std.debug.print("New login: {s} {s}\n", .{ username, password });
 
                     std.debug.print("New login: {s} {s}\n", .{ username, password });

-                    if (login_user(&db, username, password)) |session_token| {
-                        var redirect_buffer = try std.BoundedArray(u8, 128).init(0);
-                        try std.fmt.format(redirect_buffer.writer(), "/user/{s}", .{username});
-
-                        var cookie_buffer = try std.BoundedArray(u8, 128).init(0);
-                        try std.fmt.format(cookie_buffer.writer(), "session_token={}; Secure; HttpOnly", .{session_token});
-
-                        try req.respond("", .{
-                            .status = .see_other,
-                            .extra_headers = &.{
-                                .{ .name = "Location", .value = redirect_buffer.constSlice() },
-                                .{ .name = "Set-Cookie", .value = cookie_buffer.constSlice() },
-                            },
-                        });
-                    } else {
-                        try redirect(&req, "/login");
+                    if (login_user(env, username, password)) |session_token| {
+                        res.status = .see_other;
+                        try res.add_header(
+                            "Location",
+                            .{ "/user/{s}", .{username} },
+                        );
+                        try res.add_header(
+                            "Set-Cookie",
+                            .{ "session_token={s}; Secure; HttpOnly", .{session_token} },
+                        );
+
+                        try res.send();
+                    } else |err| {
+                        std.debug.print("login_user err: {}\n", .{err});
+                        try res.redirect("/login");
+                        try res.send();
+                    }
+                } else if (std.mem.eql(u8, req.target, "/logout")) {
+                    if (logged_in) |login| {
+                        try logout_user(env, login.session_token);
+
+                        try res.add_header(
+                            "Set-Cookie",
+                            .{"session_token=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT"},
+                        );
+
+                        try res.redirect("/");
+                        try res.send();

                     }
                     }

-                } else if (std.mem.eql(u8, req.head.target, "/logout")) {
+                } else if (std.mem.eql(u8, req.target, "/post")) {

                     if (logged_in) |login| {
                     if (logged_in) |login| {

-                        logout_user(&db, login.session_token);
-                        try req.respond("", .{
-                            .status = .see_other,
-                            .extra_headers = &.{
-                                .{ .name = "Location", .value = "/" },
-                                .{ .name = "Set-Cookie", .value = "session_token=deleted; Expires=Thu, 01 Jan 1970 00:00:00 GMT" },
-                            },
-                        });
+                        const text = req.get_value("text").?;
+                        try post(env, login.user_id, text);
+
+                        try res.redirect("/");
+                        try res.send();

                     }
                     }

-                } else if (std.mem.eql(u8, req.head.target, "/quit")) {
-                    try redirect(&req, "/");
+                } else if (std.mem.eql(u8, req.target, "/quit")) {
+                    try res.redirect("/");
+                    try res.send();

                     break :accept;
                     break :accept;

+                } else if (std.mem.startsWith(u8, req.target, "/upvote/")) {
+                    const login = logged_in orelse return error.NotLoggedIn;
+
+                    const post_id_str = req.target[8..req.target.len];
+                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
+
+                    try vote(env, post_id, login.user_id, .Up);
+                    try unvote(env, post_id, login.user_id, .Down);
+
+                    if (req.get_header("Referer")) |ref| {
+                        try res.redirect(ref);
+                    }
+                    try res.send();
+                } else if (std.mem.startsWith(u8, req.target, "/downvote/")) {
+                    const login = logged_in orelse return error.NotLoggedIn;
+
+                    const post_id_str = req.target[10..req.target.len];
+                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
+
+                    try vote(env, post_id, login.user_id, .Down);
+                    try unvote(env, post_id, login.user_id, .Up);
+
+                    if (req.get_header("Referer")) |ref| {
+                        try res.redirect(ref);
+                    }
+                    try res.send();
+                } else if (std.mem.startsWith(u8, req.target, "/unupvote/")) {
+                    const login = logged_in orelse return error.NotLoggedIn;
+
+                    const post_id_str = req.target[10..req.target.len];
+                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
+
+                    try unvote(env, post_id, login.user_id, .Up);
+
+                    if (req.get_header("Referer")) |ref| {
+                        try res.redirect(ref);
+                    }
+                    try res.send();
+                } else if (std.mem.startsWith(u8, req.target, "/undownvote/")) {
+                    const login = logged_in orelse return error.NotLoggedIn;
+
+                    const post_id_str = req.target[12..req.target.len];
+                    const post_id: PostId = @enumFromInt(try std.fmt.parseUnsigned(u64, post_id_str, 10));
+
+                    try unvote(env, post_id, login.user_id, .Down);
+
+                    if (req.get_header("Referer")) |ref| {
+                        try res.redirect(ref);
+                    }
+                    try res.send();

                 } else {
                 } else {

-                    try req.respond(
-                        \\<p>POST</p>
-                    , .{});
+                    // try req.respond(
+                    //     \\<p>POST</p>
+                    // , .{});
+                    try res.write("<p>[POST] {s}</p>", .{req.target});
+                    try res.send();

                 }
             }
         }
                 }
             }
         }