tepythai / aws-mobile-appsync-sdk-js

JavaScript library files for Offline, Sync, Sigv4. includes support for React Native

AWS AppSync JavaScript SDK

This SDK can be used with the Apollo JavaScript client found here.

package	version
aws-appsync
aws-appsync-react

Installation

npm

npm install --save aws-appsync

yarn

yarn add aws-appsync

Usage

React / React Native

• Creating an AppSync client
• queries
• mutations
• subscriptions
• offline helpers
• Tutorial

Vue
Angular
Creating a new AWS AppSync API
License

React / React Native

For more documentation on graphql operations performed by React Apollo click here.

Creating a client

import AWSAppSyncClient from 'aws-appsync'
import AppSyncConfig from './aws-exports'
import { ApolloProvider } from 'react-apollo'
import { Rehydrated } from 'aws-appsync-react' // this needs to also be installed when working with React

import App from './App'

const client = new AWSAppSyncClient({
  url: AppSyncConfig.graphqlEndpoint,
  region: AppSyncConfig.region,
  auth: {
    type: AppSyncConfig.authenticationType,
    apiKey: AppSyncConfig.apiKey,
    // jwtToken: async () => token, // Required when you use Cognito UserPools OR OpenID Connect. token object is obtained previously
  }
})

const WithProvider = () => (
  <ApolloProvider client={client}>
    <Rehydrated>
      <App />
    </Rehydrated>
  </ApolloProvider>
)

export default WithProvider

Queries

import gql from 'graphql-tag'
import { graphql } from 'react-apollo'

const listPosts = gql`
  query listPosts {
    listPosts {
      items {
        id
        name
      }
    }
  }
`
class App extends Component {
  render() {
    return (
      <div>
        {
          this.props.posts.map((post, index) => (
            <h2 key={index}>{post.name}</h2>
          ))
        }
      </div>
    )
  }
}

export default graphql(listPosts, {
  options: {
    fetchPolicy: 'cache-and-network'
  },
  props: props => ({
    posts: props.data.listPosts ? props.data.listPosts.items : []
  })
})(App)

Mutations & optimistic UI (with graphqlMutation helper)

import gql from 'graphql-tag'
import { graphql, compose } from 'react-apollo'
import { graphqlMutation } from 'aws-appsync-react'

const CreatePost = gql`
  mutation createPost($name: String!) {
    createPost(input: {
      name: $name
    }) {
      name
    }
  }
`

class App extends Component {
  state = { name: '' }
  onChange = (e) => { this.setState({ name: e.target.value }) }
  addTodo = () => this.props.createPost({ name: this.state.name })
  render() {
    return (
      <div>
        <input onChange={this.onChange} placeholder='Todo name' />
        <button onClick={this.addTodo}>Add Todo</button>
        {
          this.props.posts.map((post, index) => (
            <h2 key={index}>{post.name}</h2>
          ))
        }
      </div>
    )
  }
}

export default compose(
  graphql(listPosts, {
    options: {
      fetchPolicy: 'cache-and-network'
    },
    props: props => ({
      posts: props.data.listPosts ? props.data.listPosts.items : []
    })
  }),
  graphqlMutation(CreatePost, listPosts, 'Post')
)(App)

Mutations & optimistic UI (without graphqlMutation helper)

import gql from 'graphql-tag'
import uuidV4 from 'uuid/v4'
import { graphql, compose } from 'react-apollo'

const CreatePost = gql`
  mutation createPost($name: String!) {
    createPost(input: {
      name: $name
    }) {
      name
    }
  }
`

class App extends Component {
  state = { name: '' }
  onChange = (e) => { this.setState({ name: e.target.value }) }
  addTodo = () => this.props.onAdd({ id: uuidV4(), name: this.state.name })
  render() {
    return (
      <div>
        <input onChange={this.onChange} placeholder='Todo name' />
        <button onClick={this.addTodo}>Add Todo</button>
        {
          this.props.posts.map((post, index) => (
            <h2 key={index}>{post.name}</h2>
          ))
        }
      </div>
    )
  }
}

export default compose(
  graphql(listPosts, {
    options: {
      fetchPolicy: 'cache-and-network'
    },
    props: props => ({
      posts: props.data.listPosts ? props.data.listPosts.items : []
    })
  }),
  graphql(CreatePost, {
    options: {
      update: (dataProxy, { data: { createPost } }) => {
        const query = listPosts
        const data = dataProxy.readQuery({ query })
        data.listPosts.items.push(createPost)
        dataProxy.writeQuery({ query, data })
      }
    },
    props: (props) => ({
      onAdd: (post) => {
        props.mutate({
          variables: post,
          optimisticResponse: () => ({
            createPost: { ...post, __typename: 'Post' }
          }),
        })
      }
    }),
  })
)(App)

Subscriptions (with buildSubscription helper)

import gql from 'graphql-tag'
import { graphql } from 'react-apollo'
import  { buildSubscription } from 'aws-appsync'

const listPosts = gql`
  query listPosts {
    listPosts {
      items {
        id
        name
      }
    }
  }
`

const PostSubscription = gql`
  subscription postSubscription {
    onCreatePost {
      id
      name
    }
  } 
`

class App extends React.Component {
  componentDidMount() {
    this.props.data.subscribeToMore(
      buildSubscription(PostSubscription, listPosts)
    )
  }
  render() {
    return (
      <div>
        {
          this.props.posts.map((post, index) => (
            <h2 key={index}>{post.name}</h2>
          ))
        }
      </div>
    )
  }
}

export default graphql(listPosts, {
  options: {
    fetchPolicy: 'cache-and-network'
  },
  props: props => ({
    posts: props.data.listPosts ? props.data.listPosts.items : [],
    data: props.data
  })
})(App)

Subscriptions (without buildSubscription helper)

import gql from 'graphql-tag'
import { graphql } from 'react-apollo'

const listPosts = gql`
  query listPosts {
    listPosts {
      items {
        id
        name
      }
    }
  }
`

const PostSubscription = gql`
  subscription postSubscription {
    onCreatePost {
      id
      name
    }
  } 
`

class App extends React.Component {
  componentDidMount() {
    this.props.subscribeToNewPosts()
  }
  render() {
    return (
      <div>
        {
          this.props.posts.map((post, index) => (
            <h2 key={index}>{post.name}</h2>
          ))
        }
      </div>
    )
  }
}

export default graphql(listPosts, {
  options: {
    fetchPolicy: 'cache-and-network'
  },
  props: props => ({
    posts: props.data.listPosts ? props.data.listPosts.items : [],
    subscribeToNewPosts: params => {
      props.data.subscribeToMore({
        document: PostSubscription,
        updateQuery: (prev, { subscriptionData: { data : { onCreatePost } } }) => ({
          ...prev,
          listPosts: { __typename: 'PostConnection', items: [onCreatePost, ...prev.listPosts.items.filter(post => post.id !== onCreatePost.id)] }
        })
      })
    },
  })
})(App)

Offline helpers

For detailed documentation about the offline helpers, look at the API Definifion.

Vue

For more documentation on Vue Apollo click here.

main.js

import Vue from 'vue'
import App from './App'
import router from './router'

import AWSAppSyncClient from 'aws-appsync'
import VueApollo from 'vue-apollo'
import AppSyncConfig from './aws-exports'

const config = {
  url: AppSyncConfig.graphqlEndpoint,
  region: AppSyncConfig.region,
  auth: {
    type: AppSyncConfig.authType,
    apiKey: AppSyncConfig.apiKey,
  }
}
const options = {
  defaultOptions: {
    watchQuery: {
      fetchPolicy: 'cache-and-network',
    }
  }
}

const client = new AWSAppSyncClient(config, options)

const appsyncProvider = new VueApollo({
  defaultClient: client
})

Vue.use(VueApollo)

new Vue({
  el: '#app',
  router,
  components: { App },
  provide: appsyncProvider.provide(),
  template: '<App/>'
})

App.vue

<template>
  <div id="app" v-if="hydrated">
    <router-view/>
  </div>
</template>

<script>
export default {
  name: 'App',
  data: () => ({ hydrated: false }),
  async mounted() {
    await this.$apollo.provider.defaultClient.hydrated()
    this.hydrated = true
  },
}
</script>

connected component

import gql from 'graphql-tag'
import uuidV4 from 'uuid/v4'

const CreateTask = gql`
  mutation createTask($id: ID!, $name: String!, $completed: Boolean!) {
    createTask(
      input: {
        id: $id, name: $name, completed: $completed
      }
    ) {
      id
      name
      completed
    }
  }
`

const DeleteTask = gql`
  mutation deleteTask($id: ID!) {
    deleteTask(
      input: {
        id: $id
      }
    ) {
      id
    }
  }
`

const ListTasks = gql`
  query listTasks {
    listTasks {
      items {
        id
        name
        completed
      }
    }
  }
`

const UpdateTask = gql`
  mutation updateTask($id: ID!, $name: String!, $completed: Boolean!) {
    updateTask(
      input: {
        id: $id
        name: $name
        completed: $completed
      }
    ) {
      id
      name
      completed
    }
  }
`

// In your component (Examples of queries & mutations)
export default {
  name: 'Tasks',
  methods: {
    toggleComplete(task) {
      const updatedTask = {
        ...task,
        completed: !task.completed
      }
      this.$apollo.mutate({
        mutation: UpdateTask,
        variables: updatedTask,
        update: (store, { data: { updateTask } }) => {
          const data = store.readQuery({ query: ListTasks })
          const index = data.listTasks.items.findIndex(item => item.id === updateTask.id)
          data.listTasks.items[index] = updateTask
          store.writeQuery({ query: ListTasks, data })
        },
        optimisticResponse: {
          __typename: 'Mutation',
          updateTask: {
            __typename: 'Task',
            ...updatedTask
          }
        },
      })
      .then(data => console.log(data))
      .catch(error => console.error(error))
    },
    deleteTask(task) {
      this.$apollo.mutate({
        mutation: DeleteTask,
        variables: {
          id: task.id
        },
        update: (store, { data: { deleteTask } }) => {
          const data = store.readQuery({ query: ListTasks })
          data.listTasks.items = data.listTasks.items.filter(task => task.id !== deleteTask.id)
          store.writeQuery({ query: ListTasks, data })
        },
        optimisticResponse: {
          __typename: 'Mutation',
          deleteTask: {
            __typename: 'Task',
            ...task
          }
        },
      })
      .then(data => console.log(data))
      .catch(error => console.error(error))
    },
    createTask() {
      const taskname = this.taskname
      if ((taskname) === '') {
        alert('please create a task')
        return
      }
      this.taskname = ''
      const id = uuidV4()
      const task = {
        name: taskname,
        id,
        completed: false
      }
      this.$apollo.mutate({
        mutation: CreateTask,
        variables: task,
        update: (store, { data: { createTask } }) => {
          const data = store.readQuery({ query: ListTasks })
          data.listTasks.items.push(createTask)
          store.writeQuery({ query: ListTasks, data })
        },
        optimisticResponse: {
          __typename: 'Mutation',
          createTask: {
            __typename: 'Task',
            ...task
          }
        },
      })
      .then(data => console.log(data))
      .catch(error => console.error("error!!!: ", error))
    },
  },
  data () {
    return {
      taskname: '',
      tasks: []
    }
  },
  apollo: {
    tasks: {
      query: () => ListTasks,
      update: data => data.listTasks.items
    }
  },
}

Angular / Ionic examples coming soon

Creating an AppSync Project

To create a new AppSync project, go to https://aws.amazon.com/appsync/.

License

This library is licensed under the Amazon Software License.