This has two benefits:
- The APNS server should only send an iOS client a single push
notification for any missed messages while the device is offline
(server-side coalescing). Note that the client can still turn that
into multiple "user notifications" as it pulls from its queue.
- If multiple notifications get delivered but iOS is unable to process
them (say, because the phone just restarted and hasn't been unlocked
yet), the user should only get one "You may have received messages"
notification (client-side coalescing).
* Work in progress...
* Finish first pass draft of MessagesDynamoDb
* Use begins_with everywhere for destination device id
* Remove now unused methods
* First basic test built
* Add another test case
* Remove comment
* Verify more of the message contents
* Ensure all methods are tested
* Integrate MessagesDynamoDb into the MessagesManager
This change plugs the MessagesDynamoDb class into the live serving
flow in MessagesManager.
Tests are not yet as comprehensive for this big a change as they
should be, but they now compile and pass so checkpointing here with a
commit.
* Put DynamoDB before RDBS when deleting specific messages
* Extract method
* Make aws sdk version into a property
* Rename clientBuilder
* Discard messages with no GUID
* Unify batching logic into one function
* Comment on the source of the value in this constant
* Inline method
* Variable name swizzle
* Add timers to all public methods
* Add missing return statements
* Reject messages that are too large with response code 413
* Add configuration to control dynamo DB timeouts
* Set server timestamp from the ReceiptSender
* Change to shorter key names to optimize IOPS
* Fix tests broken by changing column names
* Fix broken copyright template output
* Remove copyright template error text
* Add experiments to control use of dynamo and rds in message storage
* Specify instance profile credentials for the dynamic configuration manager
* Use property for aws sdk version
* Switch dynamo to instance profile credentials
* Add metrics to the batch write loop
* Use placeholders in logging
