Basic global timeline

src/api/lib.zig

@@ -351,5 +351,10 @@ fn ApiConn(comptime DbConn: type) type {
             if (!self.isAdmin()) return error.PermissionDenied;
             return try services.communities.query(self.db, args, self.arena.allocator());
         }
+
+        pub fn globalTimeline(self: *Self) ![]services.notes.Note {
+            const result = try services.notes.query(self.db, .{}, self.arena.allocator());
+            return result.items;
+        }
     };
 }

src/api/services/communities.zig

@@ -239,12 +239,12 @@ pub fn query(db: anytype, args: QueryArgs, alloc: std.mem.Allocator) !QueryResul
         }
         switch (args.direction) {
             .ascending => switch (args.page_direction) {
-                .forward => try builder.andWhere(" > "),
+                .forward => try builder.appendSlice(" > "),
-                .backward => try builder.andWhere(" < "),
+                .backward => try builder.appendSlice(" < "),
             },
             .descending => switch (args.page_direction) {
-                .forward => try builder.andWhere(" < "),
+                .forward => try builder.appendSlice(" < "),
-                .backward => try builder.andWhere(" > "),
+                .backward => try builder.appendSlice(" > "),
             },
         }
 

src/api/services/notes.zig

@@ -1,6 +1,7 @@
 const std = @import("std");
 const util = @import("util");
 const sql = @import("sql");
+const common = @import("./common.zig");
 
 const Uuid = util.Uuid;
 const DateTime = util.DateTime;
@@ -57,3 +58,113 @@ pub fn get(db: anytype, id: Uuid, alloc: std.mem.Allocator) GetError!Note {
         else => error.DatabaseFailure,
     };
 }
+
+const max_max_items = 100;
+
+pub const QueryArgs = struct {
+    pub const PageDirection = common.PageDirection;
+    pub const Prev = std.meta.Child(std.meta.field(@This(), .prev).field_type);
+
+    max_items: usize = 20,
+
+    created_before: ?DateTime = null,
+    created_after: ?DateTime = null,
+
+    prev: ?struct {
+        id: Uuid,
+        created_at: DateTime,
+    } = null,
+
+    page_direction: PageDirection = .forward,
+};
+
+pub const QueryResult = struct {
+    items: []Note,
+
+    prev_page: QueryArgs,
+    next_page: QueryArgs,
+};
+
+pub fn query(db: anytype, args: QueryArgs, alloc: std.mem.Allocator) !QueryResult {
+    var builder = sql.QueryBuilder.init(alloc);
+    defer builder.deinit();
+
+    try builder.appendSlice(selectStarFromNote);
+
+    if (args.created_before != null) try builder.andWhere("note.created_at < $1");
+    if (args.created_after != null) try builder.andWhere("note.created_at > $2");
+    if (args.prev != null) {
+        try builder.andWhere("(note.created_at, note.id)");
+
+        switch (args.page_direction) {
+            .forward => try builder.appendSlice(" < "),
+            .backward => try builder.appendSlice(" > "),
+        }
+        try builder.appendSlice("($3, $4)");
+    }
+
+    try builder.appendSlice(
+        \\
+        \\ORDER BY note.created_at DESC
+        \\LIMIT $5
+        \\
+    );
+
+    const max_items = if (args.max_items > max_max_items) max_max_items else args.max_items;
+
+    const query_args = blk: {
+        const prev_created_at = if (args.prev) |prev| @as(?DateTime, prev.created_at) else null;
+        const prev_id = if (args.prev) |prev| @as(?Uuid, prev.id) else null;
+
+        break :blk .{
+            args.created_before,
+            args.created_after,
+            prev_created_at,
+            prev_id,
+            max_items,
+        };
+    };
+
+    var results = try db.queryWithOptions(
+        Note,
+        try builder.terminate(),
+        query_args,
+        .{ .prep_allocator = alloc, .ignore_unused_arguments = true },
+    );
+    defer results.finish();
+
+    const result_buf = try alloc.alloc(Note, args.max_items);
+    errdefer alloc.free(result_buf);
+
+    var count: usize = 0;
+    errdefer for (result_buf[0..count]) |c| util.deepFree(alloc, c);
+
+    for (result_buf) |*c| {
+        c.* = (try results.row(alloc)) orelse break;
+
+        count += 1;
+    }
+
+    var next_page = args;
+    var prev_page = args;
+    prev_page.page_direction = .backward;
+    next_page.page_direction = .forward;
+    if (count != 0) {
+        prev_page.prev = .{
+            .id = result_buf[0].id,
+            .created_at = result_buf[0].created_at,
+        };
+
+        next_page.prev = .{
+            .id = result_buf[count - 1].id,
+            .created_at = result_buf[count - 1].created_at,
+        };
+    }
+    // TODO: this will give incorrect links on an empty page
+
+    return QueryResult{
+        .items = result_buf[0..count],
+        .next_page = next_page,
+        .prev_page = prev_page,
+    };
+}

src/main/controllers.zig

@@ -13,6 +13,7 @@ pub const invites = @import("./controllers/invites.zig");
 pub const users = @import("./controllers/users.zig");
 pub const notes = @import("./controllers/notes.zig");
 pub const streaming = @import("./controllers/streaming.zig");
+pub const timelines = @import("./controllers/timelines.zig");
 
 pub fn routeRequest(api_source: anytype, req: *http.Request, res: *http.Response, alloc: std.mem.Allocator) void {
     // TODO: hashmaps?
@@ -42,6 +43,7 @@ const routes = .{
     notes.create,
     notes.get,
     streaming.streaming,
+    timelines.global,
 };
 
 pub fn Context(comptime Route: type) type {

src/main/controllers/timelines.zig

@@ -0,0 +1,10 @@
+pub const global = struct {
+    pub const method = .GET;
+    pub const path = "/timelines/global";
+
+    pub fn handler(_: anytype, res: anytype, srv: anytype) !void {
+        const results = try srv.globalTimeline();
+
+        try res.json(.ok, results);
+    }
+};

src/sql/lib.zig

@@ -64,6 +64,13 @@ pub const QueryBuilder = struct {
     pub fn str(self: *const QueryBuilder) []const u8 {
         return self.array.items;
     }
+
+    pub fn terminate(self: *QueryBuilder) ![:0]const u8 {
+        std.debug.assert(self.array.items.len != 0);
+        if (self.array.items[self.array.items.len - 1] != 0) try self.array.append(0);
+
+        return std.meta.assumeSentinel(self.array.items, 0);
+    }
 };
 
 // TODO: make this suck less