Skip to end of banner
Go to start of banner

Messaging services

Skip to end of metadata
Go to start of metadata

You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 144 Next »

Questions

  • When we send emails to users, should we download the body of the email and send it in the email body?  Or should we tell them to visit the portal?

    • It may be difficult to enforce zipping of messages (question)
    • At the moment, files are assumed to be stored as plain text

  • How should we configure Amazon SES? <<< What can be done using readily available SES tools, dashboards and/or alarms?

    • Proposal:
      • Reroute bounce and complaints to SNS
      • Have a worker disable emails to hard-bounced recipients
      • Also flip flags in settings for complaints
      • Store the bounce/complaint in a blob
  • Should users be notified of bounces? <<< Yes, and (1) this is a special case of 'notification', i.e. a Message triggered by a Synapse event, (2) perhaps user can configure email receipt to avoid excessive email from notifications (or other sources)
  • Should some messages be stored as templates? <<< The template should be stored as a properties file. Each individual Message should be stored in its final form.  This design choice would change for very very large notification message volumes.
    • If we start sending out notifications about Entity changes and the like, most of the contents will be similar except for the ID and some small part of the message body. We could conceivably add a flag to the MessageToUser object that tells the client to fill in a messages according to some simple template.  Then we could store the key-values of the template in a blob (perhaps following the same schema as StringAnnotations) along with the message.  
  • How should we tie Entities to users in terms of notifications?
    • Ownership?  << It might be this.
    • Favorites? << It might be this.
    • Permissions?  << I don't think it's this.
    • Something else?  << It could be a completely new set of services, allowing users to enable/disable notification.  (Could be initialized from Favorites and Owners.)

Objects

NameDBOMigration

DTO

  • MessageContent

(Immutable after creation)

  • Primary key: ID
  • Foreign key: CreatedBy (UserGroup)
  • Foreign key: MessageBody (S3 File Handle ID)
  • Etag
  • CreatedOn

Backup via ID

Note:  Etag is required because MessageStatus is mutable.

Interface

  • ID
  • CreatedBy (principal ID)
  • S3 File Handle ID
  • CreatedOn
  • MessageToUser

(Immutable after creation)

  • Foreign key: ID (MessageContent)
  • Subject (nullable)
  • Self foreign key: InReplyTo (ID) (nullable)
  • Foreign key: InReplyToRootId
    • Recursive foreign key to primary key

Secondary to MessageContent

Implements MessageContent

  • Subject (string, optional)
  • Set of recipient IDs
  • inReplyTo (optional)
  • inReplyToRoot (optional)
  • MessageRecipient

(Immutable after creation)

  • Foreign key: ID (MessageContent)
  • Foreign key: Recipient ID (UserGroup)

Secondary to MessageContent

 
  • MessageStatus
  • Foreign key: ID (MessageContent)
  • Foreign key: Recipient ID (UserGroup)
  • States: UNREAD, READ, ARCHIVED

Secondary to MessageContent

  • ID
  • Recipient
  • State
  • Comment

(Immutable after creation)

  • Foreign key: ID (MessageContent)
  • Target type (Enum ObjectType)
  • Target ID
  • TBD:  references to other Comments in the conversation*

Secondary to MessageContent

Implements MessageContent

  • Target type
  • Target ID
  • MessagingSettings

Part of UserProfile

Use existing services to support this

Secondary to UserGroup
  • Should email be sent?
  • Should emailed messages be READ automatically?
  • Other options (as necessary)
  • Blacklist of blocked users
  • CommentVotes
  • Primary key: Message ID
  • Up votes
  • Down votes
  • Is-comment-inappropriate votes
TBD
  • ID
  • Up
  • Down
  • MessageBundle
  Bundles the MessageToUser and Message Status
  • MessageRecipientSet
  
  • Set of recipient IDs

'* per Marcel, Comments may have a more complex set of references/relationships than Messages to Users have.  Rather than just 'inReplyTo', it might be that one Comment is an 'answer' to another comment which is a question.  Further, the multiple answers to a question may have 'previous' references which order them.

Other TODOs

  • Throttle message input 
    • Max 10 creations per minute
    • Max 50 recipients
  • When adding a new person to a conversation, the new person should get the whole history of the conversation
    • Might be implemented by forwarding ALL the previous messages 
    • OR by concatenating all previous into one new message

Message sender (worker)

  • Extend ObjectType to include a "MESSAGE" type
  • Have DBOMessage extend ObservableEntity
  • Send a change message when a message is created
  • Subscribe worker to the repo-changes topic
  • Look for MESSAGE-CREATED changes to process
  • The worker should always check to see if a message has already been sent, so that messages do not get resent every time the stack changes.
  • A message has been sent if there is a recipient.  The worker is in charge of making sure all sent messages have at least one recipient.  In the case where a user sends a message to multiple recipients, all of which are not visible to the user, then the worker should bounce the message back to the user, along with a bounce message.  This ensures the message has a row in the MessageStatus table.  
  • Process change of other ObjectTypes (i.e. ENTITY) for notifications
    • Needs additional state: either a link between ObjectID/Type and messageContent or ObjectID/Type and UserID

Services

  • Sorting & Pagination
    • Sort by creation date
    • Sort by subject
    • Sort by recipient name

 

MethodURIBodyParametersReturnDescriptionPermission
  • POST
/messageMessageToUser MessageToUserSends a message.  Note, message delivery permission is on a recipient-by-recipient basis, asynchronous to the message creation.  Unauthorized delivery may result in silent failure or a bounce message (TBD).

Authenticated User

 

Must be admin to send to AUTH_USERS

Must have SEND_MESSAGE permission on team to send to team

  • GET
/message/inbox 

Sorting + pagination

Paginated results<MessageBundle>Gets all messages the authenticated user has receivedAuthenticated User
  • GET
/message/outbox 

Sorting + pagination

Paginated results<MessageToUser>Gets all messages the authenticated user has sentAuthenticated User
  • GET
/message/{id}  MessageToUserGets a specific messageSender or Receiver
  • POST
/message/{id}/forwardMessageRecipientSet MessageToUserForwards a message to other recipients. This is equivalent to getting a (visible) message and POST-ing it to /messageSender or Receiver
  • GET
/message/{id}/conversation 

Sorting + pagination

Paginated results<MessageToUser>Gets messages belonging in the same thread as the message ID.  The list is filtered according to the user's ID.Sender or Receiver
  • PUT
/message/statusMessageStatus  

Marks a message as:

  • READ
  • UNREAD
  • ARCHIVED
Receiver
  • POST
/entity/{id}/messageMessageToUser MessageToUserSends a message to the creator or administrator of the given entity. This allows users to ask for permission to see restricted entities.Authenticated user
  • POST
/entity/{id}/commentComment CommentMethod for commenting on an entity.

Authenticated user with SEND_MESSAGE permission on entity

  • GET
/entity/{id}/comment 

Sorting + pagination

Paginated results<Comment>Gets messages belonging to the thread tied to the entity.Authenticated user with READ permission on entity
  • No labels