commit c9466b3d27ddd2caff5c9d61b93ef176375e54e8 · gmstn.systems/lattice

+2 -1

package.json

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               "typescript-eslint": "^8.46.0"

     

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           },

     

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           "dependencies": {

     

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               "ws": "^8.18.3"

     

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               "ws": "^8.18.3",

     

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               "zod": "^4.1.12"

     

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           }

     

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       }

pnpm-lock.yaml

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             ws:

     

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               specifier: ^8.18.3

     

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               version: 8.18.3

     

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             zod:

     

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               specifier: ^4.1.12

     

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               version: 4.1.12

     

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           devDependencies:

     

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             '@eslint/js':

     

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               specifier: ^9.37.0

     
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           resolution: {integrity: sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==}

     

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           engines: {node: '>=10'}

     

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         zod@4.1.12:

     

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           resolution: {integrity: sha512-JInaHOamG8pt5+Ey8kGmdcAcg3OL9reK8ltczgHTAwNhMys/6ThXHityHxVV2p3fkw/c+MAvBHFVYHFZDmjMCQ==}

     

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       snapshots:

     

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         '@cspotcode/source-map-support@0.8.1':

     
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         yn@3.1.1: {}

     

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         yocto-queue@0.1.0: {}

     

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         zod@4.1.12: {}

+7 -13

src/index.ts

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       import type { ShardMessage } from "@/lib/types/messages";

     

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       import { rawDataToString } from "@/lib/utils";

     

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       import { validateShardMessage, type ShardMessage } from "@/lib/validator";

     

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       import { validateNewMessage } from "@/lib/validators";

     

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       import type { RawData } from "ws";

     

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       import WebSocket from "ws";

     

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       const wss = new WebSocket.Server({ port: 8080 });

     

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       const messages: ShardMessage[] = []; // Store message history

     

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       const messages: ShardMessage[] = [];

     

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       const clients = new Set<WebSocket>();

     

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       wss.on("connection", (ws) => {

     

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           clients.add(ws);

     

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           // Send history to new client

     

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           ws.send(

     

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               JSON.stringify({

     

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                   type: "shard/history",

     
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           ws.on("message", (data: RawData) => {

     

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               const jsonText = rawDataToString(data);

     

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               const jsonData: unknown = JSON.parse(jsonText);

     

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               const {

     

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                   success,

     

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                   error,

     

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                   data: shardMessage,

     

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               } = validateShardMessage(jsonData);

     

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               if (!success) {

     

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                   console.log(error);

     

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               } else {

     

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                   messages.push(shardMessage);

     

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               }

     

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               const shardMessage = validateNewMessage(jsonData);

     

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               if (!shardMessage) return;

     

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               messages.push(shardMessage);

     

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               clients.forEach((client) => {

     

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                   if (client.readyState === WebSocket.OPEN) {

+22

src/lib/types/messages.ts

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       import { z } from "zod";

     

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       export const websocketMessageSchema = z.object({

     

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           type: z.union([z.literal("shard/message"), z.literal("shard/history")]),

     

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       });

     

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       export type WebsocketMessage = z.infer<typeof websocketMessageSchema>;

     

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       export const shardMessageSchema = websocketMessageSchema.extend({

     

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           type: z.literal("shard/message"),

     

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           text: z.string(),

     

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           timestamp: z.coerce.date(),

     

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       });

     

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       export type ShardMessage = z.infer<typeof shardMessageSchema>;

     

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       export const historyMessageSchema = websocketMessageSchema.extend({

     

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           type: z.literal("shard/history"),

     

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           messages: z.optional(z.array(shardMessageSchema)),

     

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       });

     

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       export type HistoryMessage = z.infer<typeof historyMessageSchema>;

-39

src/lib/validator.ts

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       export function assertShardMessage(

     

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           json: unknown,

     

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       ): asserts json is ShardMessage {

     

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           if (typeof json !== "object") {

     

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               throw new Error("not a js object");

     

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           }

     

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           const candidate = json as Record<string, unknown>;

     

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           if (candidate.type !== "shard/message") {

     

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               throw new Error("Invalid type");

     

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           }

     

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           if (typeof candidate.text !== "string") {

     

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               throw new Error("Invalid text");

     

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           }

     

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           const timestamp = new Date(candidate.timestamp as string);

     

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           if (!(timestamp instanceof Date)) {

     

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               throw new Error("Invalid timestamp");

     

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           }

     

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       }

     

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       // example. we will use zod in the future.

     

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       export const validateShardMessage = (json: unknown) => {

     

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           try {

     

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               assertShardMessage(json);

     

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               return { success: true, data: json };

     

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           } catch (e: unknown) {

     

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               return { error: e };

     

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           }

     

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       };

     

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       export interface ShardMessage {

     

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           type: "shard/message";

     

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           text: string;

     

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           timestamp: Date;

     

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       }

+64

src/lib/validators.ts

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       import {

     

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           historyMessageSchema,

     

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           shardMessageSchema,

     

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           websocketMessageSchema,

     

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       } from "@/lib/types/messages";

     

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       import { z } from "zod";

     

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       export const validateWsMessageString = (data: unknown) => {

     

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           const { success, error, data: message } = z.string().safeParse(data);

     

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           if (!success) {

     

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               console.error("Error decoding websocket message");

     

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               console.error(error);

     

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               return;

     

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           }

     

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           return message;

     

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       };

     

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       export const validateWsMessageType = (data: unknown) => {

     

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           const {

     

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               success: wsMessageSuccess,

     

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               error: wsMessageError,

     

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               data: wsMessage,

     

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           } = websocketMessageSchema.loose().safeParse(data);

     

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           if (!wsMessageSuccess) {

     

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               console.error(

     

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                   "Error parsing websocket message. The data might be the wrong shape.",

     

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               );

     

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               console.error(wsMessageError);

     

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               return;

     

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           }

     

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           return wsMessage;

     

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       };

     

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       export const validateHistoryMessage = (data: unknown) => {

     

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           const {

     

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               success: historySuccess,

     

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               error: historyError,

     

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               data: history,

     

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           } = historyMessageSchema.safeParse(data);

     

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           if (!historySuccess) {

     

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               console.error(

     

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                   "History message schema parsing failed. Did your type drift?",

     

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               );

     

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               console.error(historyError);

     

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               return;

     

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           }

     

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           return history;

     

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       };

     

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       export const validateNewMessage = (data: unknown) => {

     

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           const {

     

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               success: messageSuccess,

     

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               error: messageError,

     

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               data: message,

     

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           } = shardMessageSchema.safeParse(data);

     

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           if (!messageSuccess) {

     

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               console.error(

     

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                   "New message schema parsing failed. Did your type drift?",

     

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               );

     

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               console.error(messageError);

     

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               return;

     

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           }

     

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           return message;

     

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       };