Implementare l'API del Gioco e il server MCP dell'Inventario

Task 1: Implementare la Game API

Implementeremo le seguenti API in questa sezione:

1. saveGame - crea o aggiorna un gioco.
2. queryGames - restituisce una lista paginata di giochi salvati precedentemente.
3. saveAction - salva un’azione per un determinato gioco.
4. queryActions - restituisce una lista paginata di tutte le azioni relative a un gioco.
5. queryInventory - restituisce una lista paginata degli oggetti nell’inventario di un giocatore.

Schema dell’API

Per definire gli input e gli output della nostra API, creiamo il nostro schema utilizzando Zod nel file packages/game-api/src/schema/index.ts come segue:

+

import { z } from 'zod';

export const QueryInputSchema = z.object({
  cursor: z.string().optional(),
  limit: z.number().optional().default(100),
});
export type IQueryInput = z.TypeOf<typeof QueryInputSchema>;

export const ActionSchema = z.object({
  playerName: z.string(),
  timestamp: z.iso.datetime(),
  role: z.enum(['assistant', 'user']),
  content: z.string(),
});
export type IAction = z.TypeOf<typeof ActionSchema>;

export const GameSchema = z.object({
  playerName: z.string(),
  genre: z.enum(['zombie', 'superhero', 'medieval']),
  lastUpdated: z.iso.datetime(),
});
export type IGame = z.TypeOf<typeof GameSchema>;

export const ItemSchema = z.object({
  playerName: z.string(),
  itemName: z.string(),
  emoji: z.string().optional(),
  lastUpdated: z.iso.datetime(),
  quantity: z.number(),
});
export type IItem = z.TypeOf<typeof ItemSchema>;

export const createPaginatedQueryOutput = <ItemType extends z.ZodTypeAny>(
  itemSchema: ItemType,
) => {
  return z.object({
    items: z.array(itemSchema),
    cursor: z.string().nullable(),
  });
};

+-

export * from './echo.js'
import { z } from 'zod';

export const QueryInputSchema = z.object({
  cursor: z.string().optional(),
  limit: z.number().optional().default(100),
});
export type IQueryInput = z.TypeOf<typeof QueryInputSchema>;

export const ActionSchema = z.object({
  playerName: z.string(),
  timestamp: z.iso.datetime(),
  role: z.enum(['assistant', 'user']),
  content: z.string(),
});
export type IAction = z.TypeOf<typeof ActionSchema>;

export const GameSchema = z.object({
  playerName: z.string(),
  genre: z.enum(['zombie', 'superhero', 'medieval']),
  lastUpdated: z.iso.datetime(),
});
export type IGame = z.TypeOf<typeof GameSchema>;

export const ItemSchema = z.object({
  playerName: z.string(),
  itemName: z.string(),
  emoji: z.string().optional(),
  lastUpdated: z.iso.datetime(),
  quantity: z.number(),
});
export type IItem = z.TypeOf<typeof ItemSchema>;

export const createPaginatedQueryOutput = <ItemType extends z.ZodTypeAny>(
  itemSchema: ItemType,
) => {
  return z.object({
    items: z.array(itemSchema),
    cursor: z.string().nullable(),
  });
};

Elimina il file packages/game-api/src/schema/echo.ts poiché non lo utilizzeremo in questo progetto.

Consiglio

Per ognuno degli schemi che definiamo in Zod, esportiamo anche un’interfaccia utilizzando la sintassi z.TypeOf. Questo converte la nostra definizione Zod in un’interfaccia TypeScript senza duplicare gli sforzi.

Modellazione delle entità

Questo è il diagramma ER per la nostra applicazione.

Implementeremo il nostro database in DynamoDB e utilizzeremo la libreria client ElectroDB per semplificare le operazioni. Per installare electrodb e il DynamoDB Client, esegui questo comando:

pnpm

pnpm add -w electrodb@3.5.3 @aws-sdk/client-dynamodb@3.975.0

yarn

yarn add electrodb@3.5.3 @aws-sdk/client-dynamodb@3.975.0

npm

npm install --legacy-peer-deps electrodb@3.5.3 @aws-sdk/client-dynamodb@3.975.0

bun

bun install electrodb@3.5.3 @aws-sdk/client-dynamodb@3.975.0

Nota

Tutte le dipendenze vengono aggiunte al file package.json principale poiché @aws/nx-plugin segue il principio della single version policy. Per maggiori informazioni, consulta la guida ts#project.

Per definire le entità ElectroDB dal diagramma ER, creiamo il file packages/game-api/src/entities/index.ts:

import { Entity } from 'electrodb';
import { DynamoDBClient } from '@aws-sdk/client-dynamodb';

export const createActionEntity = (client: DynamoDBClient = new DynamoDBClient()) =>
  new Entity(
    {
      model: {
        entity: 'Action',
        version: '1',
        service: 'game',
      },
      attributes: {
        playerName: { type: 'string', required: true, readOnly: true },
        timestamp: {
          type: 'string',
          required: true,
          readOnly: true,
          set: () => new Date().toISOString(),
          default: () => new Date().toISOString(),
        },
        role: { type: 'string', required: true, readOnly: true },
        content: { type: 'string', required: true, readOnly: true },
      },
      indexes: {
        primary: {
          pk: { field: 'pk', composite: ['playerName'] },
          sk: { field: 'sk', composite: ['timestamp'] },
        },
      },
    },
    { client, table: process.env.TABLE_NAME },
  );

export const createGameEntity = (client: DynamoDBClient = new DynamoDBClient()) =>
  new Entity(
    {
      model: {
        entity: 'Game',
        version: '1',
        service: 'game',
      },
      attributes: {
        playerName: { type: 'string', required: true, readOnly: true },
        genre: { type: 'string', required: true, readOnly: true },
        lastUpdated: {
          type: 'string',
          required: true,
          default: () => new Date().toISOString(),
        },
      },
      indexes: {
        primary: {
          pk: { field: 'pk', composite: ['playerName'] },
          sk: {
            field: 'sk',
            composite: [],
          },
        },
      },
    },
    { client, table: process.env.TABLE_NAME },
  );

export const createInventoryEntity = (client: DynamoDBClient = new DynamoDBClient()) =>
  new Entity(
    {
      model: {
        entity: 'Inventory',
        version: '1',
        service: 'game',
      },
      attributes: {
        playerName: { type: 'string', required: true, readOnly: true },
        lastUpdated: {
          type: 'string',
          required: true,
          default: () => new Date().toISOString(),
        },
        itemName: {
          type: 'string',
          required: true,
        },
        emoji: {
          type: 'string',
          required: false,
        },
        quantity: {
          type: 'number',
          required: true,
        },
      },
      indexes: {
        primary: {
          pk: { field: 'pk', composite: ['playerName'] },
          sk: { field: 'sk', composite: ['itemName'] },
        },
      },
    },
    { client, table: process.env.TABLE_NAME },
  );

ElectroDB ci permette non solo di definire i nostri tipi, ma può anche fornire valori predefiniti per certi campi come i timestamp. Inoltre, ElectroDB segue il single-table design, che è la best practice quando si utilizza DynamoDB.

Nota

Sebbene ElectroDB supporti le collections, in questo tutorial abbiamo scelto di non utilizzarle per semplicità.

Per preparare il server MCP a interagire con l’inventario, assicuriamoci di esportare l’entità dell’inventario in packages/game-api/src/index.ts:

packages/game-api/src/index.ts

export type { AppRouter } from './router.js';
export { appRouter } from './router.js';
export type { Context } from './init.js';
export * from './client/index.js';
export * from './schema/index.js';
export * from './entities/index.js';

Nota

La struttura del pacchetto sarebbe migliore se rifattorizzassimo le entità in un progetto condiviso separato, in modo che il server MCP non debba dipendere dall’API.

Definizione delle procedure

Per implementare i metodi dell’API, apporta le seguenti modifiche in packages/game-api/src/procedures:

actions.ts

import { createActionEntity, createGameEntity } from '../entities/index.js';
import {
  ActionSchema,
  IAction,
  QueryInputSchema,
  createPaginatedQueryOutput,
} from '../schema/index.js';
import { publicProcedure } from '../init.js';
import { z } from 'zod';

export const queryActions = publicProcedure
  .input(QueryInputSchema.extend({ playerName: z.string() }))
  .output(createPaginatedQueryOutput(ActionSchema))
  .query(async ({ input }) => {
    const actionEntity = createActionEntity();
    const result = await actionEntity.query
      .primary({ playerName: input.playerName })
      .go({ cursor: input.cursor, count: input.limit });

    return {
      items: result.data as IAction[],
      cursor: result.cursor,
    };
  });

export const saveAction = publicProcedure
  .input(ActionSchema.omit({ timestamp: true }))
  .output(ActionSchema)
  .mutation(async ({ input }) => {
    const actionEntity = createActionEntity();
    const gameEntity = createGameEntity();

    const action = await actionEntity.put(input).go();
    await gameEntity
      .update({ playerName: input.playerName })
      .set({ lastUpdated: action.data.timestamp })
      .go();
    return action.data as IAction;
  });

games.ts

import { createGameEntity } from '../entities/index.js';
import {
  GameSchema,
  IGame,
  QueryInputSchema,
  createPaginatedQueryOutput,
} from '../schema/index.js';
import { publicProcedure } from '../init.js';

export const queryGames = publicProcedure
  .input(QueryInputSchema)
  .output(createPaginatedQueryOutput(GameSchema))
  .query(async ({ input }) => {
    const gameEntity = createGameEntity();
    const result = await gameEntity.scan.go({
      cursor: input.cursor,
      count: input.limit,
    });

    return {
      items: result.data as IGame[],
      cursor: result.cursor,
    };
  });

export const saveGame = publicProcedure
  .input(GameSchema.omit({ lastUpdated: true }))
  .output(GameSchema)
  .mutation(async ({ input }) => {
    const gameEntity = createGameEntity();

    const result = await gameEntity.put(input).go();
    return result.data as IGame;
  });

inventory.ts

import {
  ItemSchema,
  QueryInputSchema,
  createPaginatedQueryOutput,
} from '../schema/index.js';
import { publicProcedure } from '../init.js';
import { z } from 'zod';
import { createInventoryEntity } from '../entities/index.js';

export const queryInventory = publicProcedure
  .input(QueryInputSchema.extend({ playerName: z.string() }))
  .output(createPaginatedQueryOutput(ItemSchema))
  .query(async ({ input }) => {
    const inventoryEntity = createInventoryEntity();
    const result = await inventoryEntity.query
      .primary({ playerName: input.playerName })
      .go({ cursor: input.cursor, count: input.limit });

    return {
      items: result.data,
      cursor: result.cursor,
    };
  });

Elimina il file echo.ts (da packages/game-api/src/procedures) poiché non lo utilizzeremo in questo progetto.

Configurazione del router

Dopo aver definito le nostre procedure, per collegarle alla nostra API, aggiorna il seguente file:

packages/game-api/src/router.ts

+

import {
  awsLambdaRequestHandler,
  CreateAWSLambdaContextOptions,
} from '@trpc/server/adapters/aws-lambda';
import { t } from './init.js';
import { APIGatewayProxyEvent } from 'aws-lambda';
import { queryActions, saveAction } from './procedures/actions.js';
import { queryGames, saveGame } from './procedures/games.js';
import { queryInventory } from './procedures/inventory.js';

export const router = t.router;

export const appRouter = router({
  actions: router({
    query: queryActions,
    save: saveAction,
  }),
  games: router({
    query: queryGames,
    save: saveGame,
  }),
  inventory: router({
    query: queryInventory,
  }),
});

export const handler = awsLambdaRequestHandler({
  router: appRouter,
  createContext: (
    ctx: CreateAWSLambdaContextOptions<APIGatewayProxyEvent>,
  ) => ctx,
  responseMeta: () => ({
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': '*',
    },
  }),
});

export type AppRouter = typeof appRouter;

+-

import {
  awsLambdaRequestHandler,
  CreateAWSLambdaContextOptions,
} from '@trpc/server/adapters/aws-lambda';
import { echo } from './procedures/echo.js';
import { t } from './init.js';
import { APIGatewayProxyEvent } from 'aws-lambda';
import { queryActions, saveAction } from './procedures/actions.js';
import { queryGames, saveGame } from './procedures/games.js';
import { queryInventory } from './procedures/inventory.js';

export const router = t.router;

export const appRouter = router({
  echo,
  actions: router({
    query: queryActions,
    save: saveAction,
  }),
  games: router({
    query: queryGames,
    save: saveGame,
  }),
  inventory: router({
    query: queryInventory,
  }),
});

export const handler = awsLambdaRequestHandler({
  router: appRouter,
  createContext: (
    ctx: CreateAWSLambdaContextOptions<APIGatewayProxyEvent>,
  ) => ctx,
  responseMeta: () => ({
    headers: {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': '*',
    },
  }),
});

export type AppRouter = typeof appRouter;

Task 2: Creare un server MCP per l’inventario

Creiamo un server MCP che permetterà al nostro agente di gestire gli oggetti nell’inventario di un giocatore.

Definiremo i seguenti strumenti per il nostro agente:

• list-inventory-items per recuperare gli oggetti correnti nell’inventario del giocatore
• add-to-inventory per aggiungere oggetti all’inventario del giocatore
• remove-from-inventory per rimuovere oggetti dall’inventario del giocatore

Per risparmiare tempo, definiremo tutti gli strumenti inline:

packages/inventory/src/mcp-server/server.ts

+

import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import z from 'zod';
import { createInventoryEntity } from ':dungeon-adventure/game-api';

/**
 * Create the MCP Server
 */
export const createServer = () => {
  const server = new McpServer({
    name: 'inventory-mcp-server',
    version: '1.0.0',
  });

  const inventory = createInventoryEntity();

  server.registerTool(
    'list-inventory-items',
    {
      description: "List items in the player's inventory. Leave cursor blank unless you are requesting subsequent pages",
      inputSchema: {
        playerName: z.string(),
        cursor: z.string().optional(),
      },
    },
    async ({ playerName }) => {
      const results = await inventory.query
        .primary({
          playerName,
        })
        .go();

      return {
        content: [{ type: 'text' as const, text: JSON.stringify(results) }],
      };
    },
  );

  server.registerTool(
    'add-to-inventory',
    {
      description: "Add an item to the player's inventory. Quantity defaults to 1 if omitted.",
      inputSchema: {
        playerName: z.string(),
        itemName: z.string(),
        emoji: z.string(),
        quantity: z.number().optional().default(1),
      },
    },
    async ({ playerName, itemName, emoji, quantity = 1 }) => {
      await inventory
        .put({
          playerName,
          itemName,
          quantity,
          emoji,
        })
        .go();

      return {
        content: [
          {
            type: 'text' as const,
            text: `Added ${itemName} (x${quantity}) to inventory`,
          },
        ],
      };
    },
  );

  server.registerTool(
    'remove-from-inventory',
    {
      description: "Remove an item from the player's inventory. If quantity is omitted, all items are removed.",
      inputSchema: {
        playerName: z.string(),
        itemName: z.string(),
        quantity: z.number().optional(),
      },
    },
    async ({ playerName, itemName, quantity }) => {
      // If quantity is omitted, remove the entire item
      if (quantity === undefined) {
        try {
          await inventory.delete({ playerName, itemName }).go();
          return {
            content: [
              { type: 'text' as const, text: `${itemName} removed from inventory.` },
            ],
          };
        } catch {
          return {
            content: [
              { type: 'text' as const, text: `${itemName} not found in inventory` },
            ],
          };
        }
      }

      // If quantity is specified, fetch current quantity and update
      const item = await inventory.get({ playerName, itemName }).go();

      if (!item.data) {
        return {
          content: [
            { type: 'text' as const, text: `${itemName} not found in inventory` },
          ],
        };
      }

      const newQuantity = item.data.quantity - quantity;

      if (newQuantity <= 0) {
        await inventory.delete({ playerName, itemName }).go();
        return {
          content: [
            { type: 'text' as const, text: `${itemName} removed from inventory.` },
          ],
        };
      }

      await inventory
        .put({
          playerName,
          itemName,
          quantity: newQuantity,
          emoji: item.data.emoji,
        })
        .go();

      return {
        content: [
          {
            type: 'text' as const,
            text: `Removed ${itemName} (x${quantity}) from inventory. ${newQuantity} remaining.`,
          },
        ],
      };
    },
  );

  return server;
};

+-

import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import { registerAddTool } from './tools/add.js';
import { registerSampleGuidanceResource } from './resources/sample-guidance.js';
import z from 'zod';
import { createInventoryEntity } from ':dungeon-adventure/game-api';

/**
 * Create the MCP Server
 */
export const createServer = () => {
  const server = new McpServer({
    name: 'inventory-mcp-server',
    version: '1.0.0',
  });

  registerAddTool(server);
  registerSampleGuidanceResource(server);
  const inventory = createInventoryEntity();

  server.registerTool(
    'list-inventory-items',
    {
      description: "List items in the player's inventory. Leave cursor blank unless you are requesting subsequent pages",
      inputSchema: {
        playerName: z.string(),
        cursor: z.string().optional(),
      },
    },
    async ({ playerName }) => {
      const results = await inventory.query
        .primary({
          playerName,
        })
        .go();

      return {
        content: [{ type: 'text' as const, text: JSON.stringify(results) }],
      };
    },
  );

  server.registerTool(
    'add-to-inventory',
    {
      description: "Add an item to the player's inventory. Quantity defaults to 1 if omitted.",
      inputSchema: {
        playerName: z.string(),
        itemName: z.string(),
        emoji: z.string(),
        quantity: z.number().optional().default(1),
      },
    },
    async ({ playerName, itemName, emoji, quantity = 1 }) => {
      await inventory
        .put({
          playerName,
          itemName,
          quantity,
          emoji,
        })
        .go();

      return {
        content: [
          {
            type: 'text' as const,
            text: `Added ${itemName} (x${quantity}) to inventory`,
          },
        ],
      };
    },
  );

  server.registerTool(
    'remove-from-inventory',
    {
      description: "Remove an item from the player's inventory. If quantity is omitted, all items are removed.",
      inputSchema: {
        playerName: z.string(),
        itemName: z.string(),
        quantity: z.number().optional(),
      },
    },
    async ({ playerName, itemName, quantity }) => {
      // If quantity is omitted, remove the entire item
      if (quantity === undefined) {
        try {
          await inventory.delete({ playerName, itemName }).go();
          return {
            content: [
              { type: 'text' as const, text: `${itemName} removed from inventory.` },
            ],
          };
        } catch {
          return {
            content: [
              { type: 'text' as const, text: `${itemName} not found in inventory` },
            ],
          };
        }
      }

      // If quantity is specified, fetch current quantity and update
      const item = await inventory.get({ playerName, itemName }).go();

      if (!item.data) {
        return {
          content: [
            { type: 'text' as const, text: `${itemName} not found in inventory` },
          ],
        };
      }

      const newQuantity = item.data.quantity - quantity;

      if (newQuantity <= 0) {
        await inventory.delete({ playerName, itemName }).go();
        return {
          content: [
            { type: 'text' as const, text: `${itemName} removed from inventory.` },
          ],
        };
      }

      await inventory
        .put({
          playerName,
          itemName,
          quantity: newQuantity,
          emoji: item.data.emoji,
        })
        .go();

      return {
        content: [
          {
            type: 'text' as const,
            text: `Removed ${itemName} (x${quantity}) from inventory. ${newQuantity} remaining.`,
          },
        ],
      };
    },
  );

  return server;
};

Man mano che il numero di strumenti cresce, puoi eventualmente rifattorizzarli in file separati.

Elimina le directory tools e resources in packages/inventory/src/mcp-server poiché non verranno utilizzate.

Task 3: Aggiornare l’infrastruttura

Il passo finale è aggiornare la nostra infrastruttura per creare la tabella DynamoDB e concedere i permessi per eseguire operazioni dalla Game API. Per farlo, aggiorna packages/infra/src come segue:

constructs/electrodb-table.ts

import { CfnOutput } from 'aws-cdk-lib';
import {
  AttributeType,
  BillingMode,
  ProjectionType,
  Table,
  TableProps,
} from 'aws-cdk-lib/aws-dynamodb';
import { Construct } from 'constructs';
import { suppressRules } from ':dungeon-adventure/common-constructs';

export type ElectrodbDynamoTableProps = Omit<
  TableProps,
  'partitionKey' | 'sortKey' | 'billingMode'
>;

export class ElectrodbDynamoTable extends Table {
  constructor(scope: Construct, id: string, props?: ElectrodbDynamoTableProps) {
    super(scope, id, {
      partitionKey: {
        name: 'pk',
        type: AttributeType.STRING,
      },
      sortKey: {
        name: 'sk',
        type: AttributeType.STRING,
      },
      billingMode: BillingMode.PAY_PER_REQUEST,
      ...props,
    });

    this.addGlobalSecondaryIndex({
      indexName: 'gsi1pk-gsi1sk-index',
      partitionKey: {
        name: 'gsi1pk',
        type: AttributeType.STRING,
      },
      sortKey: {
        name: 'gsi1sk',
        type: AttributeType.STRING,
      },
      projectionType: ProjectionType.ALL,
    });

    // Suppress checkov rules that expect a KMS customer managed key and backup to be enabled
    suppressRules(this, ['CKV_AWS_119', 'CKV_AWS_28'], 'No need for custom encryption or backup');

    new CfnOutput(this, 'TableName', { value: this.tableName });
  }
}

stacks/application-stack.ts

+

import {
  GameApi,
  GameUI,
  InventoryMcpServer,
  RuntimeConfig,
  StoryAgent,
  UserIdentity,
} from ':dungeon-adventure/common-constructs';
import { Stack, StackProps, CfnOutput } from 'aws-cdk-lib';
import { PolicyStatement } from 'aws-cdk-lib/aws-iam';
import { Construct } from 'constructs';
import { ElectrodbDynamoTable } from '../constructs/electrodb-table.js';
import { RuntimeAuthorizerConfiguration } from '@aws-cdk/aws-bedrock-agentcore-alpha';

export class ApplicationStack extends Stack {
  constructor(scope: Construct, id: string, props?: StackProps) {
    super(scope, id, props);

    const userIdentity = new UserIdentity(this, 'UserIdentity');

    const electroDbTable = new ElectrodbDynamoTable(this, 'ElectroDbTable');

    const gameApi = new GameApi(this, 'GameApi', {
      integrations: GameApi.defaultIntegrations(this)
        .withDefaultOptions({
          environment: {
            TABLE_NAME: electroDbTable.tableName,
          },
        })
        .build(),
    });

    electroDbTable.grantReadData(gameApi.integrations['actions.query'].handler);
    electroDbTable.grantReadData(gameApi.integrations['games.query'].handler);
    electroDbTable.grantReadData(gameApi.integrations['inventory.query'].handler);
    electroDbTable.grantReadWriteData(
      gameApi.integrations['actions.save'].handler,
    );
    electroDbTable.grantReadWriteData(
      gameApi.integrations['games.save'].handler,
    );

    const { userPool, userPoolClient } = userIdentity;

    const mcpServer = new InventoryMcpServer(this, 'InventoryMcpServer', {
      environmentVariables: {
        TABLE_NAME: electroDbTable.tableName,
      },
    });
    electroDbTable.grantReadWriteData(mcpServer.agentCoreRuntime);

    // Use Cognito for user authentication with the agent
    const storyAgent = new StoryAgent(this, 'StoryAgent', {
      authorizerConfiguration: RuntimeAuthorizerConfiguration.usingCognito(
        userPool,
        [userPoolClient],
      ),
      environmentVariables: {
        INVENTORY_MCP_ARN: mcpServer.agentCoreRuntime.agentRuntimeArn,
      },
    });

    // Grant the agent access to bedrock models
    storyAgent.agentCoreRuntime.addToRolePolicy(
      new PolicyStatement({
        actions: [
          'bedrock:InvokeModel',
          'bedrock:InvokeModelWithResponseStream',
        ],
        // You can scope the below down to the specific models you use
        resources: [
          'arn:aws:bedrock:*:*:foundation-model/*',
          'arn:aws:bedrock:*:*:inference-profile/*',
        ],
      }),
    );

    // Add the Story Agent ARN to runtime-config.json so it can be referenced by the website
    RuntimeConfig.ensure(this).config.agentArn =
      storyAgent.agentCoreRuntime.agentRuntimeArn;

    new CfnOutput(this, 'StoryAgentArn', {
      value: storyAgent.agentCoreRuntime.agentRuntimeArn,
    });
    new CfnOutput(this, 'InventoryMcpArn', {
      value: mcpServer.agentCoreRuntime.agentRuntimeArn,
    });

    // Grant the agent permissions to invoke our mcp server
    mcpServer.agentCoreRuntime.grantInvoke(storyAgent.agentCoreRuntime);

    // Grant the authenticated role access to invoke the api
    gameApi.grantInvokeAccess(userIdentity.identityPool.authenticatedRole);

    // Ensure this is instantiated last so our runtime-config.json can be automatically configured
    new GameUI(this, 'GameUI');
  }
}

+-

import {
  GameApi,
  GameUI,
  InventoryMcpServer,
  RuntimeConfig,
  StoryAgent,
  UserIdentity,
} from ':dungeon-adventure/common-constructs';
import { Stack, StackProps, CfnOutput } from 'aws-cdk-lib';
import { PolicyStatement } from 'aws-cdk-lib/aws-iam';
import { Construct } from 'constructs';
import { ElectrodbDynamoTable } from '../constructs/electrodb-table.js';
import { RuntimeAuthorizerConfiguration } from '@aws-cdk/aws-bedrock-agentcore-alpha';

export class ApplicationStack extends Stack {
  constructor(scope: Construct, id: string, props?: StackProps) {
    super(scope, id, props);

    const userIdentity = new UserIdentity(this, 'UserIdentity');

    const electroDbTable = new ElectrodbDynamoTable(this, 'ElectroDbTable');

    const gameApi = new GameApi(this, 'GameApi', {
      integrations: GameApi.defaultIntegrations(this).build(),
      integrations: GameApi.defaultIntegrations(this)
        .withDefaultOptions({
          environment: {
            TABLE_NAME: electroDbTable.tableName,
          },
        })
        .build(),
    });

    electroDbTable.grantReadData(gameApi.integrations['actions.query'].handler);
    electroDbTable.grantReadData(gameApi.integrations['games.query'].handler);
    electroDbTable.grantReadData(gameApi.integrations['inventory.query'].handler);
    electroDbTable.grantReadWriteData(
      gameApi.integrations['actions.save'].handler,
    );
    electroDbTable.grantReadWriteData(
      gameApi.integrations['games.save'].handler,
    );

    const { userPool, userPoolClient } = userIdentity;

    const mcpServer = new InventoryMcpServer(this, 'InventoryMcpServer');
    const mcpServer = new InventoryMcpServer(this, 'InventoryMcpServer', {
      environmentVariables: {
        TABLE_NAME: electroDbTable.tableName,
      },
    });
    electroDbTable.grantReadWriteData(mcpServer.agentCoreRuntime);

    // Use Cognito for user authentication with the agent
    const storyAgent = new StoryAgent(this, 'StoryAgent', {
      authorizerConfiguration: RuntimeAuthorizerConfiguration.usingCognito(
        userPool,
        [userPoolClient],
      ),
      environmentVariables: {
        INVENTORY_MCP_ARN: mcpServer.agentCoreRuntime.agentRuntimeArn,
      },
    });

    // Grant the agent access to bedrock models
    storyAgent.agentCoreRuntime.addToRolePolicy(
      new PolicyStatement({
        actions: [
          'bedrock:InvokeModel',
          'bedrock:InvokeModelWithResponseStream',
        ],
        // You can scope the below down to the specific models you use
        resources: [
          'arn:aws:bedrock:*:*:foundation-model/*',
          'arn:aws:bedrock:*:*:inference-profile/*',
        ],
      }),
    );

    // Add the Story Agent ARN to runtime-config.json so it can be referenced by the website
    RuntimeConfig.ensure(this).config.agentArn =
      storyAgent.agentCoreRuntime.agentRuntimeArn;

    new CfnOutput(this, 'StoryAgentArn', {
      value: storyAgent.agentCoreRuntime.agentRuntimeArn,
    });
    new CfnOutput(this, 'InventoryMcpArn', {
      value: mcpServer.agentCoreRuntime.agentRuntimeArn,
    });

    // Grant the agent permissions to invoke our mcp server
    mcpServer.agentCoreRuntime.grantInvoke(storyAgent.agentCoreRuntime);

    // Grant the authenticated role access to invoke the api
    gameApi.grantInvokeAccess(userIdentity.identityPool.authenticatedRole);

    // Ensure this is instantiated last so our runtime-config.json can be automatically configured
    new GameUI(this, 'GameUI');
  }
}

Nota

Nota qui che poiché ogni procedura è gestita da una singola funzione lambda, possiamo seguire il principio del minimo privilegio e assegnare solo i permessi di lettura/scrittura necessari in base all’implementazione della procedura.

Task 4: Deployment e testing

Prima, correggi eventuali problemi di linting:

pnpm

pnpm nx run-many --target lint --configuration=fix --all

yarn

yarn nx run-many --target lint --configuration=fix --all

npm

npx nx run-many --target lint --configuration=fix --all

bun

bunx nx run-many --target lint --configuration=fix --all

Poi compila la codebase:

pnpm

pnpm nx run-many --target build --all

yarn

yarn nx run-many --target build --all

npm

npx nx run-many --target build --all

bun

bunx nx run-many --target build --all

Deployare l’applicazione

Per deployare la tua applicazione, esegui il seguente comando:

pnpm

pnpm nx deploy infra "dungeon-adventure-infra-sandbox/*"

yarn

yarn nx deploy infra "dungeon-adventure-infra-sandbox/*"

npm

npx nx deploy infra "dungeon-adventure-infra-sandbox/*"

bun

bunx nx deploy infra "dungeon-adventure-infra-sandbox/*"

Attenzione

Per eseguire il bootstrap del tuo account AWS prima, esegui:

pnpm

pnpm nx bootstrap infra

yarn

yarn nx bootstrap infra

npm

npx nx bootstrap infra

bun

bunx nx bootstrap infra

Il primo deployment richiederà circa 8 minuti. I deployment successivi richiederanno circa 2 minuti.

Consiglio

Se stai modificando il codice delle funzioni Lambda, puoi eseguire il deploy con il flag --hotswap dopo aver compilato la codebase per un tempo di deployment molto più breve (2-3 secondi).

pnpm

pnpm nx run @dungeon-adventure/infra:deploy "dungeon-adventure-infra-sandbox/*" --hotswap

yarn

yarn nx run @dungeon-adventure/infra:deploy "dungeon-adventure-infra-sandbox/*" --hotswap

npm

npx nx run @dungeon-adventure/infra:deploy "dungeon-adventure-infra-sandbox/*" --hotswap

bun

bunx nx run @dungeon-adventure/infra:deploy "dungeon-adventure-infra-sandbox/*" --hotswap

Una volta completato il deployment, vedrai output simili ai seguenti (alcuni valori sono stati oscurati):

dungeon-adventure-sandbox-Application
dungeon-adventure-sandbox-Application: deploying... [2/2]

 ✅  dungeon-adventure-sandbox-Application

✨  Deployment time: 354s

Outputs:
dungeon-adventure-sandbox-Application.ElectroDbTableTableNameXXX = dungeon-adventure-sandbox-Application-ElectroDbTableXXX-YYY
dungeon-adventure-sandbox-Application.GameApiEndpointXXX = https://xxx.execute-api.region.amazonaws.com/prod/
dungeon-adventure-sandbox-Application.GameUIDistributionDomainNameXXX = xxx.cloudfront.net
dungeon-adventure-sandbox-Application.StoryApiEndpointXXX = https://xxx.execute-api.region.amazonaws.com/prod/
dungeon-adventure-sandbox-Application.UserIdentityUserIdentityIdentityPoolIdXXX = region:xxx
dungeon-adventure-sandbox-Application.UserIdentityUserIdentityUserPoolIdXXX = region_xxx

Testare l’API

Puoi testare l’API in due modi:

• Avviando un’istanza locale del backend tRPC e invocando le API con curl.
• Chiamare l'API deployata utilizzando curl con sigv4 abilitato

Locale

Per avviare il server locale game-api, esegui il seguente comando:

pnpm

TABLE_NAME=dungeon-adventure-infra-sandbox-Application-ElectroDbTableXXX-YYY pnpm nx run @dungeon-adventure/game-api:serve

yarn

TABLE_NAME=dungeon-adventure-infra-sandbox-Application-ElectroDbTableXXX-YYY yarn nx run @dungeon-adventure/game-api:serve

npm

TABLE_NAME=dungeon-adventure-infra-sandbox-Application-ElectroDbTableXXX-YYY npx nx run @dungeon-adventure/game-api:serve

bun

TABLE_NAME=dungeon-adventure-infra-sandbox-Application-ElectroDbTableXXX-YYY bunx nx run @dungeon-adventure/game-api:serve

Attenzione

Utilizza il valore dungeon-adventure-infra-sandbox-Application.ElectroDbTableTableNameXXX dall’output del deploy CDK per sostituire il segnaposto evidenziato.

Una volta avviato il server, puoi chiamarlo eseguendo il seguente comando:

curl -X GET 'http://localhost:2022/games.query?input=%7B%7D'

Deployato

acurl ap-southeast-2 execute-api -X GET 'https://xxx.execute-api.ap-southeast-2.amazonaws.com/prod/games.query?input=%7B%7D'

Attenzione

Utilizza il valore dungeon-adventure-infra-sandbox-Application.GameApiGameApiEndpointXXX dall’output del deploy CDK per sostituire il segnaposto evidenziato e imposta la regione di conseguenza.

Nota

Il %7B%7D che passiamo per testare l’API è un oggetto JSON vuoto ({}) codificato in URI.

Se il comando viene eseguito con successo, vedrai una risposta come:

{"result":{"data":{"items":[],"cursor":null}}}

Complimenti, hai costruito e deployato la tua prima API utilizzando tRPC! 🎉🎉🎉