@startuml Async Server

box Function Process in Local Environment or Container

control ENTRYPOINT

participant "~__main__" as Main

participant AsyncServer

participant DaprServer

participant gRPCServer [

Web Server

----

""gprc.server""

]

end box

entity "Dapr Sidecar " as DaprSidecar

== OpenFunction Serving ==

ENTRYPOINT -> Main ** : execute

note over ENTRYPOINT, Main: Pass through __CLI arguments__ and \ncontainer __environment variables__

Main -> Main : load user function file

note left: ""function (ctx, data) {}""

Main -> AsyncServer ** : create

note over Main, AsyncServer: Hand over __user function__ and __context__

AsyncServer -> DaprServer ** : ""new""

note over AsyncServer, DaprServer: Extract __port__ from __context__ and pass down

DaprServer -> gRPCServer ** : ""new""

|||

DaprServer --> DaprSidecar : Waiting till Dapr sidecar started

...

AsyncServer -> DaprServer : register __user function__ as handler \nfor each of __inputs__ in __context__

DaprServer -> gRPCServer : add routes for Dapr style \nsubscriptions and input bindings

...

== OpenFunction Triggering ==

DaprSidecar <-- : sub / input data

DaprSidecar -> gRPCServer ++ : Dapr request with "data"

gRPCServer -> gRPCServer ++ : invoke user function

alt

gRPCServer -> DaprSidecar ++ : publish data or invoke output binding

DaprSidecar --> gRPCServer -- : execution result

end

return

return server app response

...

@enduml