Distributed synchronization data in a message management service

A computer system comprising:

• a message management service server having one or more processors and a memory, cause the computer system to:
• receive a plurality of messages for a first client device from a messaging service running on a messaging server, wherein each message of the plurality of messages comprises an external identifier set by the message server;
• select a set of messages from the plurality of messages based on one or more criteria, wherein the set of the messages is less than a number of messages of the plurality of messages;
• store, by the message management service server, the set of messages in a server message window, the set of the messages comprising at least a first message;
• generate a synchronization data bundle for each message in the message management service window, wherein the synchronization data bundle includes the internal identifier linked to a corresponding external identifier;
• identify that a client device is online;
• receive, from the client device, a set of queued action requests;
• define a reconciled message window based at least in part on a current state of the message management service window, wherein a number of messages in the reconciled message window exceeds a nominal maximum size of the message management server window;
• update the message management server window to correspond to the reconciled message window, such that the message management server window temporarily exceeds the nominal maximum size;
• send, to the client device, an instruction to update the messages stored thereon to conform to the reconciled message window;
• upon identifying that the client device is online, synchronize the set of messages in the server message window with a client message window hosted on a client device remote from the server, by sending the set of messages and the corresponding synchronization data bundle for each message in the set of messages to the client device;
• receive a request from the first client device to perform an action on the first message, the request including the synchronization data bundle for the first message;
• in the event that the first message is present in the server message window stored for the client device, use information stored server message window to perform the requested action on the first message;
• and
• in the event that the message is absent from the server message window stored for the client device, use information from the synchronization data bundle to perform the requested action on the first message, including sending information from the synchronization data bundle to the messaging service at the messaging server.

A non-transitory computer-readable storage medium having stored thereon program code instructions that, when executed by a server computer system, cause the server computer system to perform a method comprising:

• receiving, by a server of a message management service, a plurality of messages from a message server of a messaging service, wherein each message of the plurality of messages comprises an external identifier set by the message server;
• selecting, by the server of the message management service, a set of messages from the plurality of messages based on one or more criteria, wherein the set of messages is less than a number of messages of the plurality of messages;
• storing, by the server of the message management service server, the set of messages in a message management service window, the set of messages comprising at least a first message;
• obtaining, from a client device, a set of synchronization data bundles, each synchronization data bundle in the set of synchronization data bundles corresponding to a different one of a plurality of messages stored by the client device, and where each synchronization data bundle includes an internal message identifier generated by the server of the message management service for the corresponding message and the external message identifier for the corresponding message;
• determining, based at least in part on the synchronization data bundles, whether one or more of the plurality of messages stored by the client device is absent from a message management service window;
• and
• for each one of the plurality of messages stored by the client device that is absent from the message management service window:
• extracting, from the synchronization data bundle corresponding to the message that is absent from the message management server window, the external message identifier assigned to the message by a messaging service;
• using the external message identifier to retrieve the message from the messaging service;
• adding the retrieved message to the message management service window;
• receiving, from the client device, a set of queued action requests;
• defining a reconciled message window based at least in part on a current state of the message management service window, wherein a number of messages in the reconciled message window exceeds a nominal maximum size of the message management server window;
• updating the message management server window to correspond to the reconciled message window, such that the message management server window temporarily exceeds the nominal maximum size;
• and
• sending, to the client device, an instruction to update the messages stored thereon to conform to the reconciled message window.