Use Uuids for id

src/main/api.zig

@@ -1,10 +1,11 @@
 const std = @import("std");
+const util = @import("util");
 
 const db = @import("./db.zig");
 
 pub const models = @import("./models.zig");
 pub const free = db.free;
-pub const Id = []const u8;
+pub const Uuid = util.Uuid;
 
 pub fn CreateInfo(comptime T: type) type {
     const t_fields = std.meta.fields(T);
@@ -26,7 +27,7 @@ pub fn CreateInfo(comptime T: type) type {
     } });
 }
 
-fn reify(comptime T: type, id: Id, val: CreateInfo(T)) T {
+fn reify(comptime T: type, id: Uuid, val: CreateInfo(T)) T {
     var result: T = undefined;
     result.id = id;
     inline for (std.meta.fields(CreateInfo(T))) |f| {
@@ -35,23 +36,25 @@ fn reify(comptime T: type, id: Id, val: CreateInfo(T)) T {
     return result;
 }
 
-const ApiServer = struct {
+pub const ApiServer = struct {
     db: db.Database,
+    prng: std.rand.DefaultPrng,
     last_id: u64 = 0,
 
     pub fn init(alloc: std.mem.Allocator) !ApiServer {
         return ApiServer{
             .db = try db.Database.init(alloc),
+            .prng = std.rand.DefaultPrng.init(1998),
         };
     }
 
-    fn genId(self: *ApiServer, alloc: std.mem.Allocator) ![]const u8 {
+    fn genUuid(self: *ApiServer, alloc: std.mem.Allocator) ![]const u8 {
         self.last_id += 1;
         return std.fmt.allocPrint(alloc, "{}", .{self.last_id});
     }
 
-    pub fn createNote(self: *ApiServer, info: CreateInfo(models.Note), alloc: std.mem.Allocator) !models.Note {
-        const id = try self.genId(alloc);
+    pub fn createNote(self: *ApiServer, info: CreateInfo(models.Note)) !Uuid {
+        const id = Uuid.randV4(self.prng.random());
 
         const note = reify(models.Note, id, info);
         try self.db.putNote(note);
@@ -59,7 +62,7 @@ const ApiServer = struct {
         return id;
     }
 
-    pub fn getNote(self: *ApiServer, id: Id, alloc: std.mem.Allocator) !?models.Note {
+    pub fn getNote(self: *ApiServer, id: Uuid, alloc: std.mem.Allocator) !?models.Note {
         return self.db.getNote(id, alloc);
     }
 };

src/main/db.zig

@@ -1,7 +1,8 @@
 const std = @import("std");
+const util = @import("util");
+const Uuid = util.Uuid;
 
 const models = @import("./models.zig");
-const Id = []const u8;
 
 // Clones a struct and its fields to a single layer of depth.
 // Caller owns memory, can be freed using free below
@@ -14,8 +15,11 @@ fn clone(alloc: std.mem.Allocator, val: anytype) !@TypeOf(val) {
     }
 
     inline for (std.meta.fields(@TypeOf(val))) |f| {
+        // TODO
         if (f.field_type == []u8 or f.field_type == []const u8) {
             @field(result, f.name) = try cloneString(alloc, @field(val, f.name));
+        } else if (f.field_type == Uuid) {
+            @field(result, f.name) = @field(val, f.name);
         } else {
             @compileError("unsupported field type " ++ @typeName(f.field_type));
         }
@@ -33,8 +37,11 @@ fn cloneString(alloc: std.mem.Allocator, str: []const u8) ![]const u8 {
 // Frees a struct and its fields returned by clone
 pub fn free(alloc: std.mem.Allocator, val: anytype) void {
     inline for (std.meta.fields(@TypeOf(val))) |f| {
+        // TODO
         if (f.field_type == []u8 or f.field_type == []const u8) {
             alloc.free(@field(val, f.name));
+        } else if (f.field_type == Uuid) {
+            // nothing
         } else {
             @compileError("unsupported field type " ++ @typeName(f.field_type));
         }
@@ -43,16 +50,16 @@ pub fn free(alloc: std.mem.Allocator, val: anytype) void {
 
 pub const Database = struct {
     internal_alloc: std.mem.Allocator,
-    notes: std.StringHashMap(models.Note),
+    notes: std.AutoHashMap(Uuid, models.Note),
 
     pub fn init(alloc: std.mem.Allocator) !Database {
         var db = Database{
             .internal_alloc = alloc,
-            .notes = std.StringHashMap(models.Note).init(alloc),
+            .notes = std.AutoHashMap(Uuid, models.Note).init(alloc),
         };
 
         try db.putNote(models.Note{
-            .id = "1",
+            .id = Uuid{ .data = @bitCast([16]u8, @as(u128, 1)) },
             .content = "abcd",
         });
 
@@ -68,13 +75,13 @@ pub const Database = struct {
         self.notes.deinit();
     }
 
-    pub fn containsNote(self: *Database, id: Id) !bool {
+    pub fn containsNote(self: *Database, id: Uuid) !bool {
         return self.notes.contains(id);
     }
 
     // returns a copy of the note data from storage. memory is allocated with the provided
     // allocator. can be freed using free() above
-    pub fn getNote(self: *Database, id: Id, alloc: std.mem.Allocator) !?models.Note {
+    pub fn getNote(self: *Database, id: Uuid, alloc: std.mem.Allocator) !?models.Note {
         const note = self.notes.get(id) orelse return null;
         return try clone(alloc, note);
     }

src/main/main.zig

@@ -1,8 +1,11 @@
 const std = @import("std");
 const builtin = @import("builtin");
 const http = @import("http");
+const util = @import("util");
+
 const api = @import("./api.zig");
 const models = @import("./models.zig");
+const Uuid = util.Uuid;
 
 // this thing is overcomplicated and weird. stop this
 const Router = http.Router(*RequestServer);
@@ -50,15 +53,17 @@ fn createNote(srv: *RequestServer, ctx: *http.server.Context, _: RouteArgs) !voi
     const body = ctx.request.body orelse return respondJson(ctx, .bad_request, .{ .@"error" = "no note body provided" }, srv.alloc);
     var tokens = std.json.TokenStream.init(body);
     const note = try std.json.parse(api.CreateInfo(models.Note), &tokens, .{ .allocator = srv.alloc });
-    defer std.json.parseFree(models.Note, note, .{ .allocator = srv.alloc });
+    defer std.json.parseFree(api.CreateInfo(models.Note), note, .{ .allocator = srv.alloc });
 
-    try srv.api.createNote(note);
+    // TODO
+    _ = try srv.api.createNote(note);
 
     try respondJson(ctx, .created, note, srv.alloc);
 }
 
 fn getNote(srv: *RequestServer, ctx: *http.server.Context, args: RouteArgs) !void {
-    const id = args.get("id") orelse return error.NotFound;
+    const id_str = args.get("id") orelse return error.NotFound;
+    const id = Uuid.parse(id_str) catch return respondJson(ctx, .bad_request, .{ .@"error" = "invalid id" }, srv.alloc);
     const note = (try srv.api.getNote(id, srv.alloc)) orelse return error.NotFound;
     defer api.free(srv.alloc, note);
 

src/main/models.zig

@@ -1,4 +1,6 @@
+const Uuid = @import("util").Uuid;
+
 pub const Note = struct {
-    id: []const u8,
+    id: Uuid,
     content: []const u8,
 };