commit 7365e0775fe5d38332981a83470b3624cb365ccb · gmstn.systems/lattice

+48 -4

src/index.ts

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       const main = () => {

     

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           console.log("Hello!!");

     

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       };

     

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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 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 clients = new Set<WebSocket>();

     

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       main();

     

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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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                   messages: messages,

     

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               }),

     

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           );

     

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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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               clients.forEach((client) => {

     

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

     

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                       client.send(JSON.stringify(shardMessage));

     

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                   }

     

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               });

     

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           });

     

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           ws.on("close", () => {

     

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               clients.delete(ws);

     

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           });

     

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       });

     

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       console.log("Server running on ws://localhost:8080");

+11

src/lib/utils.ts

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       import type { RawData } from "ws";

     

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       export const rawDataToString = (data: RawData): string => {

     

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           if (Buffer.isBuffer(data)) {

     

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               return data.toString("utf-8");

     

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           }

     

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           if (Array.isArray(data)) {

     

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               return Buffer.concat(data).toString("utf-8");

     

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           }

     

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           return new TextDecoder().decode(data);

     

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       };

+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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       }