More text

Author: 0xFlicker

README.md

@@ -174,7 +174,16 @@ The bot should respond with an embed card and an image.
 
 ## Delayed responses
 
-Discord requires that interaction URL callbacks respond within 3 seconds. This can be a problem for lambdas because of the cold start problem. In order to be able to take the time needed to respond to
+Discord requires that interaction URL callbacks respond within 3 seconds. This can be a problem for lambdas because of the cold start problem. In order to be able to take the time needed to respond to queries we separate the acknowledgement of interactions from the response.
+
+Here are some pictures to illustrate what that process looks like
+
+![Deferred Message Processing Overview](./images/deferred-message-processing.png)
+
+![Deferred Message Processing Sequence](./images/deferred-msg-sequence.png)
+
+Result:
+![example](./images/deferred_interaction.gif)
 
 ## Invite link
 

images/deferred-message-processing.png

@@ -0,0 +1,32 @@
+@startuml deferred-msg-sequence
+!include <awslib/AWSCommon>
+!include <awslib/Compute/Lambda>
+!include <awslib/Database/DynamoDB>
+!include <awslib/Storage/SimpleStorageServiceS3>
+!include <awslib/ApplicationIntegration/SQS>
+!include <awslib/ApplicationIntegration/SNS>
+!include <material/common>
+!include <material/discord>
+
+skinparam componentStyle rectangle
+
+title Deferred processing sequence
+
+participant "<<Discord>>\n==Interaction outgoing<color:blue><$ma_discord>" as discord_interaction
+LambdaParticipant(discord_lambda, "Interaction callback", "Responds to Discord interaction events")
+SNSParticipant(deferred_topic, "Deferred message topic", "Topic to publish deferred messages to")
+SQSParticipant(deferred_queue, "Deferred message queue", "Queue for deferred messages")
+LambdaParticipant(deferred_lambda, "Deferred messaging", "Updates existing messages with new content")
+participant "<<Discord>>\n==API Response<color:blue><$ma_discord>" as discord_api
+
+discord_interaction -> discord_lambda: On interaction event
+discord_lambda -> discord_interaction: Ack msg
+discord_lambda -> deferred_topic: Defer msg
+discord_lambda <- deferred_topic: Success
+deferred_topic -> deferred_queue: queue msg
+deferred_queue -> deferred_lambda: Process msg
+deferred_lambda -> discord_api: Update msg
+deferred_lambda <- discord_api: Success
+deferred_lambda -> deferred_queue: Done
+
+@enduml

images/deferred-msg-sequence.png

@@ -0,0 +1,29 @@
+@startuml deferred-message-processing
+!include <awslib/AWSCommon>
+!include <awslib/Compute/Lambda>
+!include <awslib/Database/DynamoDB>
+!include <awslib/Storage/SimpleStorageServiceS3>
+!include <awslib/ApplicationIntegration/SQS>
+!include <awslib/ApplicationIntegration/SNS>
+!include <material/common>
+!include <material/discord>
+
+skinparam componentStyle rectangle
+
+title Deferred Message Processing
+
+Lambda(discord_lambda, "Interaction callback", "Responds to Discord interaction events")
+Lambda(deferred_lambda, "Deferred messaging", "Updates existing messages with new content")
+SQS(deferred_queue, "Deferred message queue", "Queue for deferred messages")
+SNS(deferred_topic, "Deferred message topic", "Topic to publish deferred messages to")
+MA_DISCORD(Blue, 1.5, discord_interaction, rectangle, "[Discord interaction outgoing]")
+MA_DISCORD(Blue, 1.5, discord_api, rectangle, "[Discord webhook message update]")
+
+discord_interaction -d-> discord_lambda: On interaction event
+discord_lambda -u-> discord_interaction: Ack msg
+discord_lambda -> deferred_topic: Defer msg
+deferred_topic -> deferred_queue: queue msg
+deferred_queue -> deferred_lambda: Process msg
+deferred_lambda -u-> discord_api: Update msg
+
+@enduml