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graphql-codegen-aws-cdk-appsync-resolver

v0.4.1

Published

generate aws-cdk appsync resolver from schema.graphql

Downloads

79

Readme

graphql-codegen-aws-cdk-appsync-resolver

Generate aws-cdk AppSync

Quick Start

  1. install peer dependencies:

    $ yarn add -D graphql @graphql-codegen/cli
  2. install graphql-codegen-aws-cdk-appsync-resolver

    $ yarn add -D graphql-codegen-aws-cdk-appsync-resolver

    note: versions

    | aws-cdk | graphql-codegen-aws-cdk-appsync-resolver | | ------- | ---------------------------------------- | | <=1.59 | <=0.3.2 | | >=1.60 | >=0.4.0 |

  3. add codegen.yml:

    schema:
      - "./schema.graphql"
    generates:
    ./AppSyncResolver.ts:
      plugins:
        - "graphql-codegen-aws-cdk-appsync-resolver"
  4. Your Graphql Schema

    type Item {
      id: ID!
      name: String
    }
    type PaginatedItem {
      items: [Item!]!
      nextToken: String
    }
    type Query {
      all(limit: Int, nextToken: String): PaginatedItem!
      getOne(id: ID!): Item
    }
    type Mutation {
      save(name: String!): Item
      delete(id: ID!): Item
    }
    type Schema {
      query: Query
      mutation: Mutation
    }
  5. generate AppSyncResolver Templates

    $ yarn graphql-codegen

    generated AppSyncResolver.ts

    import { CfnResolver } from "@aws-cdk/aws-appsync";
    import { Construct } from "@aws-cdk/core";
    
     ...
    
    export const createQueryAllResolver = createResolver("Query", "all");
    export const createQueryGetOneResolver = createResolver("Query", "getOne");
    export const createMutationSaveResolver = createResolver("Mutation", "save");
    export const createMutationDeleteResolver = createResolver("Mutation", "delete");
  6. aws-cdk Usage Sample

    // Your aws-cdk code
    import { GraphQLApi } from "@aws-cdk/aws-appsync";
    import { Construct, Stack, StackProps } from "@aws-cdk/core";
    import {
      createQueryGetUserResolver,
      createQueryListUsersResolver,
    } from "./your/path/to/generated/AppSyncResolver";
    
    class TestStack extends Stack {
      constructor(scope: Construct, id: string, props?: StackProps) {
        super(scope, id, props);
    
        const api = new GraphQLApi( ... );
    
        // crate GetOne Query resolver template
        createQueryGetOneResolver(
          this,
          {
            api,
            ...
          }
        );
    
        // crate ListUsers Query resolver template
        createQueryListUsersResolver(
          this,
          name => `Dev${name}` // name function
          {
            api,
            ...
          }
        );
      }
    }

    synthesized CloudFormation Template

    Resources:
      ItemsApi:
        Type: AWS::AppSync::GraphQLApi
        ...
      AppSyncResolverQueryGetUser:
        Type: AWS::AppSync::Resolver
        ...
        RequestMappingTemplate: >-
            {
              "version" : "2017-02-28",
              "operation": "Invoke",
              "type": QueryGetUser,
              ...
            }
        ResponseMappingTemplate: ...
      DevAppSyncResolverQueryListUsers:
        Type: AWS::AppSync::Resolver
        ...
        RequestMappingTemplate: >-
            {
              "version" : "2017-02-28",
              "operation": "Invoke",
              "type": QueryListUsers,
              ...
            }
        ResponseMappingTemplate: ...
     ...