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Backpack SDK Documentation

Installing the SDK

  1. Configuring the SDK

Link to the relevant script files in your HTML files

<script src=”https://admin.yourBackpack.com/sdk.js”></script>

  1. Call the createSdk method from your JavaScript code with the Backpack’s unique URL and API key.

const sdk = createSdk('https://backpackName-be.myDomain.com/', 'aLong&RandomApiKey');

The object returned by createSdk exposes Backpack’s functionality through modules that each represent a core Backpack component: collection management, data persistence, user authentication, file storage, realtime communication over websockets.

SDK Methods

Authentication:

For security purposes, the Users collection that contains the email and encrypted password for each user is not accessible from the API.

register(email, password)

email and password should be strings. The user will be registered using their email as their username. Returns a JSON object with the user's ID.

sdk.auth.register('user@users.com', 'my_password123')

=> { "id": "5e9f2eee0fb8891a90d642a2" }

login(email, password)

email and password should be strings. The user will be logged in. Returns a JSON object with the user's ID.

sdk.auth.login('user@users.com', 'my_password123')

=> { "id": "5e9f2eee0fb8891a90d642a2" }

logout()

Current user will be logged out.

sdk.auth.logout()

=> { message: OK }

Database interactions

getCollectionsList()

Returns a JSON object containing an array of collection names.

sdk.db.getCollectionList()

=> ['messages', 'comments']

createNewCollection(collectionName)

collectionName should be a string. Creates a new set of routes for the collection. Returns the name of the collection.The actual collection will be created when a record is added to it. It will not appear in the list of collections until the first record has been added.

sdk.db.createNewCollection('messages')

=> messages

getCollection(collection)

collection should be a string. Returns a JSON object containing an array of database records for the collection.

sdk.db.getCollection('messages')

=> [
    {
        "_id": "5e9f2fc00fb8899611d642a4",
        "text": "I am a message!",
        "createdAt": "2020-04-21T17:39:12.829Z",
        "updatedAt": "2020-04-21T17:39:12.829Z",
        "__v": 0
    },
    {
        "_id": "5e9f31220fb8898538d642a5",
        "text": "I am another message!",
        "createdAt": "2020-04-21T17:45:06.722Z",
        "updatedAt": "2020-04-21T17:45:06.722Z",
        "__v": 0
    }
]

getResource(collection, id)

collection and id should be strings. Returns a JSON object containing a database record.

sdk.db.getResource('messages', '5e9f2eee0fb8891a90d642a2')
=> {
    "_id": "5e9f2fc00fb8899611d642a4",
    "text": "I am a message!",
    "createdAt": "2020-04-21T17:39:12.829Z",
    "updatedAt": "2020-04-21T17:39:12.829Z",
    "__v": 0
}

createResource(collection, data)

collection should be a string. data should be an object. The data argument can contain any key-value pairs. It is up to the frontend developer to ensure data integrity by placing constraints on the arguments that can be passed to this method. Timestamps and unique ID will be added automatically.

sdk.db.createResource('messages', { "text": "I am a message!" })
=> {
    "_id": "5e9f2fc00fb8899611d642a4",
    "text": "I am a message!",
    "createdAt": "2020-04-21T17:39:12.829Z",
    "updatedAt": "2020-04-21T17:39:12.829Z",
    "__v": 0
}

updateResource(collection, id, data)

collection and id should be strings. data should be an object containing the key-value pairs to be updated. This method will update the existing record by modifying existing fields and/or adding new ones. Existing key-value pairs not included in the data argument will remain in the document.

sdk.db.updateResource('messages', '5e9f2fc00fb8899611d642a4', {"text": "updated message"})
=> {
    "_id": "5e9f2fc00fb8899611d642a4",
    "text": "updated message",
    "__v": 0,
    "updatedAt": "2020-04-21T18:08:35.297Z",
    "createdAt": "2020-04-21T18:08:35.297Z"
}
sdk.db.createResource('messages', { "new_field": "some other information" })
=> {
    "_id": "5e9f2fc00fb8899611d642a4",
    "text": "updated message",
    "new_field": "some other information",
    "createdAt": "2020-04-21T17:39:12.829Z",
    "updatedAt": "2020-04-21T17:39:12.829Z",
    "__v": 0
}

overwriteResource(collection, id, data)

collection and id should be strings. data should be an object containing the key-value pairs to be updated. This method will overwrite the existing record with the key-value pairs in the data argument. Key-value pairs not included in data will be lost.

sdk.db.updateResource('messages', '5e9f2fc00fb8899611d642a4', {"new_key": "some value"})
=> {
    "_id": "5e9f2fc00fb8899611d642a4",
    "new_key": "some value",
    "__v": 0,
    "updatedAt": "2020-04-21T18:08:35.297Z",
    "createdAt": "2020-04-21T18:08:35.297Z"
}

deleteResource(collection, id)

collection and id should be strings. id is the id of the resource to be deleted.

sdk.db.deleteResource('messages', '5e9f2fc00fb8899611d642a4')
=> {
    "_id": "5e9f2fc00fb8899611d642a4",
    "text": "I am a message!",
    "createdAt": "2020-04-21T17:39:12.829Z",
    "updatedAt": "2020-04-21T17:39:12.829Z",
    "__v": 0
}

File storage:

getFile(userId, filename)

Returns the file in the body of the response. The file is identified by filename and the userId of the user who uploaded it. filename should be a string.

Can be accessed by calling .blob() on the response body, creating a url by calling URL.createObjectURL() on the blob file, and using the return value as the value for the src attribute in the html. See MDN: https://developer.mozilla.org/en-US/docs/Web/API/Body/blob

sdk.storage.getFile("5e9f38f8126233001e2dc194", "my_photo.jpg");
=>      {
            "_id": "5e9f38f8126233001e2dc194",
            "userId": "5e876354eb2b13001ea7097a",
            "filename": "my_photo.jpg",
            "bucket": "none",
            "createdAt": "2020-04-21T18:18:32.365Z",
            "updatedAt": "2020-04-21T18:18:32.365Z",
            "__v": 0
        }

getListOfUserFiles(userId)

userId should be a string. Returns a JSON object containing an array of metadata records for the files associated with a user.

sdk.storage.getListOfUserFiles('5e876354eb2b13001ea7097a')

=>  { records: 
      [      
        {
            "_id": "5e9f38f8126233001e2dc194",
            "userId": "5e876354eb2b13001ea7097a",
            "filename": "my_photo.jpg",
            "bucket": "none",
            "createdAt": "2020-04-21T18:18:32.365Z",
            "updatedAt": "2020-04-21T18:18:32.365Z",
            "__v": 0
        },
        {
            "_id": "5e9f3b2c126233001e2dc195",
            "userId": "5e876354eb2b13001ea7097a",
            "filename": "my_other_photo.jpg",
            "bucket": "none",
            "createdAt": "2020-04-21T18:27:56.797Z",
            "updatedAt": "2020-04-21T18:27:56.797Z",
            "__v": 0
        }
      ]
    }

uploadFile(fileFromFormData, filename, bucket)

File must be multipart/form-data.filename and bucket should be strings and must not be empty. filename should include extension.

In the html, set the form attribute to enctype="multipart/form-data". File will be saved under current_user_id/filename.

sdk.storage.uploadFile(file, 'my_photo.jpg', 'photos')
=> {
    "_id": "5e9f38f8126233001e2dc194",
    "userId": "5e876354eb2b13001ea7097a",
    "filename": "my_photo.jpg",
    "bucket": "photos",
    "createdAt": "2020-04-21T18:18:32.365Z",
    "updatedAt": "2020-04-21T18:18:32.365Z",
    "__v": 0
}

updateFile(currentFilename, newFilename, bucket)

Overwrites file metadata. All arguments should be strings. newFilename should include extension.

sdk.storage.updateFil('my_other_photo.jpg', 'new_photo_name.jpg', 'archived_photos')

=> {
    "record": {
        "_id": "5e9f3b2c126233001e2dc195",
        "userId": "5e876354eb2b13001ea7097a",
        "filename": "new_photo_name.jpg",
        "bucket": "archived_photos",
        "createdAt": "2020-04-21T18:27:56.797Z",
        "updatedAt": "2020-04-21T18:31:37.319Z",
        "__v": 0
    }
}

overwriteFile(fileFromFormData, filename)

Replaces file currently saved under current_user/filename with fileFromFormData. Metadata will not be updated. filename should be a string.

sdk.storage.overwriteFile(file, 'new_photo_name.jpg')
=> { "message": "file overwritten" }

deleteFile(filename)

Deletes file under current_user/filename. filename should be a string.

sdk.storage.deleteFile('new_photo_name, jpg')
=> {
    "deletedRecord": {
        "_id": "5e9f3b2c126233001e2dc195",
        "userId": "5e876354eb2b13001ea7097a",
        "filename": "new_photo_name.jpg",
        "bucket": "archived_photos",
        "createdAt": "2020-04-21T18:27:56.797Z",
        "updatedAt": "2020-04-21T18:31:37.319Z",
        "__v": 0
    }
}

Websocket

To create a websocket connection, call the ws() method on the sdk object:

const websocket = sdk.ws();

This websocket object has an actions object that contains a number of convenience methods for sending messages, interacting with the database, and creating and managing channels. These methods are listed below.

The client and the websocket server in Backpack communicate with each other by sending JSON messages back and forth.

Access the messages the server sends using the standard Websocket API message event:

websocket.onmessage = (e) => {
  const message = JSON.parse(e.data);
}

Messages always include an action property set to a string that tells the server how to process the message. Once the message is processed, the server sends a message to the client with the same action property value along with additional information corresponding to the action.

Here are the list of actions:

find
getAll
getOne
create
update
patch
delete
broadcast
joinUsersChannels
createChannel
joinChannel
leaveChannel
changeChannel
deleteChannel
open
close

Here is a list of methods to interact with the database.

Note, you never have include the userId of the client that is calling a method--the server logs the userId on the initial get request when establishing the websocket connection through Backpack's authentication system.

broadcast(message)

message should be an object.

This method simply broadcasts the given message to active websocket connections.

If the message contains a channelType and channelId property, the message is only broadcast to active websocket connections who are subscribed to that channel.

If the message DOES NOT contain a channelType and channelId property, the message is broadcast to ALL active websocket connections.

Please see the Websocket Channels section in this documentation for more information on Channels.

websocket.actions.broadcast(message);

=> {
  action: 'broadcast',
  customAction: 'userTyping',
  userId: "5e9b9e47a15aa8001eaf635a"
}

findResource(collection, query)

collection should be a string. query should be an object.

Returns a JSON object containing an action property that is set to 'find' and a response property that is set to an array of database records that match the query.

websocket.actions.findResource('messages', { userId: '5e9b9e47a15aa8001eaf635a' });

=> {
  action: "find",
  response: [
    {
      _id: "5e9f1ec2387d701181de03af",
      userName: "Sally",
      userId: "5e9b9e47a15aa8001eaf635a",
      text: "Hello?",
      createdAt: "2020-04-21T16:26:42.804Z",
      updatedAt: "2020-04-21T16:26:42.804Z",
      __v: 0,
    },
    {
      _id: "5e9f630c9bda1f125bdcf1a2",
      userName: "Sally",
      userId: "5e9b9e47a15aa8001eaf635a",
      text: "This is amazing!",
      createdAt: "2020-04-21T21:18:04.845Z",
      updatedAt: "2020-04-21T21:18:04.845Z",
      __v: 0,
    },
  ],
}

getCollection(collection)

collection should be a string.

Returns a JSON object containing an action property that is set to 'getAll', a collection property that is set to the database collection name, and a response property that is set to an array of all of the database records in the collection.

websocket.actions.getCollection('messages');

=> {
  action: "getAll",
  collection: "messages",
  response: [
    {
      _id: "5e9f1ebb387d701181de03ae",
      userName: "George",
      userId: "5e9bf673dbdb350a9c08ebb0",
      text: "Good morning!",
      createdAt: "2020-04-21T16:26:35.021Z",
      updatedAt: "2020-04-21T16:26:35.021Z",
      __v: 0,
    },
    {
      _id: "5e9f1ec2387d701181de03af",
      userName: "Sally",
      userId: "5e9b9e47a15aa8001eaf635a",
      text: "Hi everyone!",
      createdAt: "2020-04-21T16:26:42.804Z",
      updatedAt: "2020-04-21T16:26:42.804Z",
      __v: 0,
    },
}

getResource(collection, id)

collection and id should be strings.

Returns a JSON object containing an action property that is set to 'getOne', a collection property that is set to the database collection name, and a response property that is set to the requested database record.

websocket.actions.getResource('rooms', '5e9f1c70d84722112da48213');

=> {
  action: "getOne",
  collection: "rooms",
  response: {
    _id: "5e9f1c70d84722112da48213",
    channelType: "rooms",
    name: "Burlington, VT Mountain Bikers",
    userId: "5e9b9e47a15aa8001eaf635a",
    createdAt: "2020-04-21T16:16:48.551Z",
    updatedAt: "2020-04-21T16:16:48.551Z",
    __v: 0,
  }
}

createResource(collection, data)

collection should be a string. data should be an object. The data argument can contain any key-value pairs.

It is up to the frontend developer to ensure data integrity by placing constraints on the arguments that can be passed to this method.

Returns a JSON object containing an action property that is set to 'create', a collection property that is set to the database collection name, and a response property that is set to the new database record.

websocket.actions.createResource('messages', { userName: 'Sally', text: 'First message!' });

=> {
  action: "create",
  collection: "messages",
  data: {
    userName: "Sally"
    userId: "5e9b9e47a15aa8001eaf635a"
    text: "First message!",
  }
}

overwriteResource(collection, id, data)

collection and id should be strings. data should be an object containing the key-value pairs to be updated.

This method will overwrite the existing record with the key-value pairs in the data argument. Key-value pairs not included in data will be lost.

Returns a JSON object containing an action property that is set to 'update', a collection property that is set to the database collection name, and a response property that is set to the overwritten database record.

websocket.actions.overwriteResource('messages', '5e9f52b39bda1f125bdcf1a1', { text: '1st comment!' });

=> {
  action: "update",
  collection: "messages",
  response: {
    _id: "5e9f52b39bda1f125bdcf1a1",
    userId: "5e9b9e47a15aa8001eaf635a",
    text: "1st comment!",
    __v: 0,
    updatedAt: "2020-04-21T20:26:00.159Z",
    createdAt: "2020-04-21T20:26:00.159Z",
  }
}

updateResource(collection, id, data)

collection and id should be strings. data should be an object containing the key-value pairs to be updated.

This method will update the existing record by modifying existing fields and/or adding new ones. Existing key-value pairs not included in the data argument will remain in the document.

Returns a JSON object containing an action property that is set to 'patch', a collection property that is set to the database collection name, and a response property that is set to the updated database record.

websocket.actions.updateResource('messages', '5e9f52b39bda1f125bdcf1a1', { text: '1st message!' });

=> {
  action: "patch",
  collection: "messages",
  response: {
    _id: "5e9f52b39bda1f125bdcf1a1",
    userName: "Sally",
    userId: "5e9b9e47a15aa8001eaf635a",
    text: "1st message!",
    createdAt: "2020-04-21T20:08:19.635Z",
    updatedAt: "2020-04-21T20:17:39.385Z",
    __v: 0,
  }
}

deleteResource(collection, id)

collection and id should be strings. id is the id of the resource to be deleted.

Returns a JSON object containing an action property that is set to 'delete', a collection property that is set to the database collection name, and a response property that is set to the deleted database record.

websocket.actions.deleteResource('messages', '5e9f52b39bda1f125bdcf1a1' });

=> {
  action: "delete",
  collection: "messages",
  response: {
    _id: "5e9f52b39bda1f125bdcf1a1",
    userId: "5e9b9e47a15aa8001eaf635a",
    text: "1st comment!",
    __v: 0,
    updatedAt: "2020-04-21T20:26:00.159Z",
    createdAt: "2020-04-21T20:26:00.159Z",
  }
}

open(message)

message should be an object.

Broadcasts the given message as a JSON object to all active websocket connections. A userId property is added to the message.

websocket.actions.open(message);

=> {
  action: "open",
  userId: "5e9b9e47a15aa8001eaf635a"
}

close(message)

message should be an object.

Broadcasts the given message as a JSON object to all active websocket connections. A userId property is added to the message.

websocket.actions.close(message);

=> {
  action: "close",
  userId: "5e9b9e47a15aa8001eaf635a"
}

Websocket Channels

Channels functionality allows you to route websocket messages to the connections that should receive them. For example, a Chat app with different Chat Rooms should only send messages from a room to the websocket connections that are subscribed to that room. It doesn't make sense to send those messages to all active websocket connections.

To implement a basic app with channels functionality, two collection types are needed:

  1. channelCollection - like chatrooms, chessgames, etc.,
  2. channelMessagesCollection - like messages, chessmoves, etc.

Channels are referenced by an object with a channelType property and a channelId property:

  1. channelType is set to the name of the channelCollection collection
  2. channelId is set to the _id of a document in the collection that represents the channel.

Example channel object:

{ channelType: "rooms", channelId: "5e9f1c70d84722112da48213" }

If you want to store the channels your users have subscribed to and the channel they were last engaged with, create a 'usersInformationCollection' collection (name it whatever you a like) and include a field called currentChannel and a field called channels.

currentChannel takes a channel object. Two examples:

  1. If the user is a new user and has not engaged with any channels yet, or if the last channel the user engaged with was deleted and the user's channels field is an empty array:
channels: { channelType: null, channelId: null },
  1. The last channel a user engaged with:
channels: { channelType: "rooms", channelId: "5e9f1c70d84722112da48213" }

channels takes an array of channel objects. Example:

channels: [
  {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
  {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
],

createChannel(usersInformationCollection, channelType, name)

usersInformationCollection, channelType, and name should be a string.

This method creates a new channel document.

For this method to work, the usersInformationCollection collection must contain a field called currentChannel and a field called channels as described above.

Example method call:

websocket.actions.createChannel('usersmeta', 'rooms', 'Burlington, VT Mountain Bikers');

Two different messages are sent:

  1. All active websocket connections receive the following message except for the client that called this method:
=> {
  action: "createChannel",
  response: {
    _id: "5ea06e249bda1f125bdcf1a3",
    channelType: "rooms",
    name: "Burlington, VT Mountain Bikers",
    userId: "5e9b9e47a15aa8001eaf635a",
    createdAt: "2020-04-22T16:17:40.100Z",
    updatedAt: "2020-04-22T16:17:40.100Z",
    __v: 0,
  },
}
  1. Only the client that called this method is sent the following response message. Please note that the user's channels and currentChannel fields have been updated.
=> {
  action: "createChannel",
  response: {
    _id: "5ea06e249bda1f125bdcf1a3",
    channelType: "rooms",
    name: "Burlington, VT Mountain Bikers",
    userId: "5e9b9e47a15aa8001eaf635a",
    createdAt: "2020-04-22T16:17:40.100Z",
    updatedAt: "2020-04-22T16:17:40.100Z",
    __v: 0,
  },
  usersChannels: [
    {channelType: "rooms", channelId: "5e9f1f749be921119dbfa716"},
    {channelType: "rooms", channelId: "5ea06e249bda1f125bdcf1a3"},
  ],
  usersCurrentChannel: {
    channelType: "rooms",
    channelId: "5ea06e249bda1f125bdcf1a3",
  },
}

joinUsersChannels(usersInformationCollection)

usersInformationCollection should be a string.

This method returns a list of channels the user is subscribed to.

For this method to work, the usersInformationCollection collection must contain a field called channels as described above.

Example method call:

websocket.actions.joinUsersChannels('usersmeta');

Only the websocket client that called this method is sent the response message.

=> {
  action: "joinUsersChannels",
  usersChannels: [
    {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
    {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
    {channelType: "rooms", channelId: "5e9f1d9d387d701181de03a7"},
    {channelType: "rooms", channelId: "5e9f1dde387d701181de03a8"},
    {channelType: "rooms", channelId: "5e9f1efe9be921119dbfa714"},
    {channelType: "rooms", channelId: "5e9f1f749be921119dbfa716"},
  ],
}

joinChannel(usersInformationCollection, channelType, channelId)

usersInformationCollection, channelType, and channelId should be strings.

This method subscribes a user to the channel referenced by the channelType and channelId arguments and updates the following fields in the user's usersInformationCollection document:

  1. channels: A new channel object is added to the channels field array
  2. currentChannel: The currentChannel field is set to this new channel object.

For this method to work, the usersInformationCollection collection must contain a field called currentChannel and a field called channels as described above.

Example method call:

websocket.actions.joinChannel('usersmeta', 'rooms', '5e9f1e5c387d701181de03a9');

Two different messages are sent:

  1. All active websocket connections subscribed to the channel defined by the channelType and channelId in the message body receive the following message except for the client that called this method:
=> {
  action: "joinChannel",
  userId: "5e9b9e47a15aa8001eaf635a",
  channelType: "rooms",
  channelId: "5e9f1e5c387d701181de03a9",
}
  1. Only the client that called this method is sent the following response message. Please note that the user's channels and currentChannel fields have been updated.
websocket.actions.joinChannel('usersmeta', 'rooms', '5e9f1e5c387d701181de03a9');

=> {
  action: "joinChannel",
  userId: "5e9b9e47a15aa8001eaf635a",
  channelType: "rooms",
  channelId: "5e9f1e5c387d701181de03a9",
  response: {
    _id: "5e9b9e47a15aa8001eaf635b",
    username: "Sally",
    userId: "5e9b9e47a15aa8001eaf635a",
    usersChannels: [
      {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
      {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
      {channelType: "rooms", channelId: "5e9f1d9d387d701181de03a7"},
      {channelType: "rooms", channelId: "5e9f1dde387d701181de03a8"},
      {channelType: "rooms", channelId: "5e9f1efe9be921119dbfa714"},
      {channelType: "rooms", channelId: "5e9f1f749be921119dbfa716"},
    ],
    currentChannel: {channelType: "rooms", channelId: "5e9f1e5c387d701181de03a9"},
    broadcast: false,
    createdAt: "2020-04-19T00:41:43.446Z",
    updatedAt: "2020-04-21T20:33:36.131Z",
    __v: 0,
  }
}

leaveChannel(usersInformationCollection, channelType, channelId)

usersInformationCollection, channelType, and channelId should be strings.

This method unsubscribes a user from the channel referenced by the channelType and channelId arguments and updates the following fields in the user's usersInformationCollection document:

  1. channels: The object in the channels field array that contains the channelType and channelId is deleted
  2. currentChannel: The currentChannel field is set to the first channel in the the user's channels field array if the array isn't empty (e.g. { channelType: "rooms", channelId: "5e9f1c70d84722112da48213" }), otherwise it is set to no channel (e.g. { channelType: null, channelId: null }).

For this method to work, the usersInformationCollection collection must contain a field called currentChannel and a field called channels as described above.

Example method call:

websocket.actions.leaveChannel('usersmeta', 'rooms', '5e9f1e5c387d701181de03a9');

Two different messages are sent:

  1. All active websocket connections subscribed to the channel defined by the channelType and channelId in the message body receive the following message except for the client that called this method:
websocket.actions.leaveChannel('usersmeta', 'rooms', '5e9f1e5c387d701181de03a9');

=> {
  action: "leaveChannel",
  userId: "5e9b9e47a15aa8001eaf635a",
  channelType: "rooms",
  channelId: "5e9f1e5c387d701181de03a9",
}
  1. Only the client that called this method is sent the following response message. Please note that the user's channels and currentChannel fields have been upated.
websocket.actions.leaveChannel('usersmeta', 'rooms', '5e9f1e5c387d701181de03a9');

=> {
  action: "leaveChannel",
  userId: "5e9b9e47a15aa8001eaf635a",
  channelType: "rooms",
  channelId: "5e9f1e5c387d701181de03a9",
  response: {
    _id: "5e9b9e47a15aa8001eaf635b",
    username: "Sally",
    userId: "5e9b9e47a15aa8001eaf635a",
    channels: [
      {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"}
      {channelType: "rooms", channelId: "5e9f1d9d387d701181de03a7"}
      {channelType: "rooms", channelId: "5e9f1dde387d701181de03a8"}
      {channelType: "rooms", channelId: "5e9f1efe9be921119dbfa714"}
      {channelType: "rooms", channelId: "5e9f1f749be921119dbfa716"}
    ],
    currentChannel: {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
    broadcast: false,
    createdAt: "2020-04-19T00:41:43.446Z",
    updatedAt: "2020-04-21T20:37:33.331Z",
    __v: 0,
  },
}

changeChannel(usersInformationCollection, channelType, channelId)

usersInformationCollection, channelType, and channelId should be strings.

This method changes the user's current channel to the channel referenced by the channelType and channelId arguments by updating the currentChannel field in the user's usersInformationCollection document.

For this method to work, the usersInformationCollection collection must contain a field called currentChannel and a field called channels as described above.

Example method call:

websocket.actions.changeChannel('usersmeta', 'rooms', '5e9f1e5c387d701181de03a9');

Only the client that called this method is sent the following response message. Please note that the user's currentChannel field has been updated.

=> {
  action: "changeChannel",
  userId: "5e9b9e47a15aa8001eaf635a",
  channelType: "rooms",
  channelId: "5e9f1efe9be921119dbfa714",
  response: {
    _id: "5e9b9e47a15aa8001eaf635b",
    username: "Sally",
    userId: "5e9b9e47a15aa8001eaf635a",
    channels: [
      {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
      {channelType: "rooms", channelId: "5e9f1d9d387d701181de03a7"},
      {channelType: "rooms", channelId: "5e9f1dde387d701181de03a8"},
      {channelType: "rooms", channelId: "5e9f1efe9be921119dbfa714"},
      {channelType: "rooms", channelId: "5e9f1f749be921119dbfa716"},
    ],
    currentChannel: {channelType: "rooms", channelId: "5e9f1efe9be921119dbfa714"},
    broadcast: false,
    createdAt: "2020-04-19T00:41:43.446Z",
    updatedAt: "2020-04-21T20:40:06.384Z",
    __v: 0,
  },
}

deleteChannel(usersInformationCollection, channelMessagesCollection, channelType, channelId)

usersInformationCollection, channelMessagesCollection, channelType, and channelId should be strings.

This method deletes the channel referenced by the channelType and channelId arguments:

  • The message documents associated with the channel are deleted from the channelMessagesCollection collection
  • The channel document is deleted from the channelType collection

The currentChannel and channels fields are then updated in the usersInformationCollection document for each user that is subscribed to the channel.

The channel referenced by the channelType and channelId arguments is deleted from the channels array.

The currentChannel field is set to the first channel in the the user's channels field array if the array isn't empty (e.g. { channelType: "rooms", channelId: "5e9f1c70d84722112da48213" }), otherwise it is set to no channel (e.g. { channelType: null, channelId: null }).

Each active websocket connection that was subscribed to the deleted channel is sent a message with updated channels and currentChannel values for that user.

For this method to work, the usersInformationCollection collection must contain a field called currentChannel and a field called channels as described above.

websocket.actions.deleteChannel('usersmeta', 'rooms', '5e9f1efe9be921119dbfa714');

=> {
  action: "deleteChannel",
  userId: "5e9b9e47a15aa8001eaf635a",
  channelType: "rooms",
  channelId: "5e9f1efe9be921119dbfa714",
  response: {
    _id: "5e9b9e47a15aa8001eaf635b",
    username: "Sally",
    userId: "5e9b9e47a15aa8001eaf635a",
    channels: [
      {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
      {channelType: "rooms", channelId: "5e9f1d9d387d701181de03a7"},
      {channelType: "rooms", channelId: "5e9f1dde387d701181de03a8"},
      {channelType: "rooms", channelId: "5e9f1f749be921119dbfa716"},
    ],
    currentChannel: {channelType: "rooms", channelId: "5e9f1c70d84722112da48213"},
    broadcast: false,
    createdAt: "2020-04-19T00:41:43.446Z",
    updatedAt: "2020-04-21T20:42:08.111Z",
    __v: 0,
  },
}

Websocket & HTTP Responses

When you make HTTP requests by calling the methods on the db object of the SDK (see the list below), the response from the database interaction is broadcast to active websocket connections.

If the response contains a channelType and channelId property, the message is only broadcast to active websocket connections who are subscribed to that channel.

If the response does not contain a channelType and channelId property, the message is broadcast to all active websocket connections.

If you don't want the response broadcast to any websocket connections, include a property in the document called broadcast and set it to false. It is recommended that you do this on your usersInformationCollection collection.

Methods that will broadcast the response from interacting with the database:

  • db.createResource(collection, data)
  • db.updateResource(collection, id, data)
  • db.overwriteResource(collection, id, data)
  • db.deleteResource(collection, id)

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SDK for calling Backpack API endpoints. Built with JavaScript (ES6).

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