functions-framework-nodejs/docs/uml/ofn-async.puml at master · OpenFunction/functions-framework-nodejs · GitHub

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@startuml OpenFunction in Async Runtime

box Function Process in Local Environment or Container
control ENTRYPOINT
participant Main
participant AsyncServer
participant DaprServer
participant Restana [
  Web Server
  ----
  ""Restana""
]
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 -> Restana ** : ""new""
note over Restana: Super fast and minimalist framework \nfor building REST micro-services
|||
DaprServer --> DaprSidecar : Waiting till Dapr sidecar started
note over DaprServer, DaprSidecar #FFAAAA: Using HTTP channel due to lack of good support of gRPC in Dapr Node.js SDK
...
AsyncServer -> DaprServer : register __user function__ as handler \nfor each of __inputs__ in __context__
DaprServer -> Restana : add routes for Dapr style \nsubscriptions and input bindings

...

== OpenFunction Triggering ==

DaprSidecar <--] : sub / input data

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

Restana -> Restana ++ : invoke user function

alt
  Restana -> DaprSidecar ++ : publish data or invoke output binding
  DaprSidecar --> Restana -- : execution result
end

return

return server app response

...

@enduml