@startuml

skinparam backgroundColor transparent

package "PostgREST" {
  () HTTP as HTTPAPI
  HTTPAPI  - [Auth]
  [Auth] -r.> [ApiRequest]
  [ApiRequest] -r.> [Plan]
  [Plan] -r.> [Query]
  [Query] - () "Connection Pool" : "\t"
  [Plan] -u-> [Schema Cache]:uses
  [Schema Cache] <- () Listener : reloads

  () HTTP as HTTPADMIN
  [Admin]  -r- () HTTPADMIN
  [Config] -l- () CLI

  [Config] <-r~ Listener

  HTTPADMIN -[hidden]r- CLI
  [Schema Cache] -l[hidden]- [Config]
  [Schema Cache] -l[hidden]- [Admin]
  [Schema Cache] -l[hidden]- CLI
}


database "PostgreSQL" {
  node Authorization {
    rectangle "Roles, GRANT, RLS"
  }
  node "API schema" as API {
    rectangle "Functions, Views"
  }
  rectangle "Tables, extensions" as tbs
  API -d- tbs

  API -l[hidden]- Authorization
}

:user:
hexagon Proxy
:user: .r-> Proxy
HTTPAPI <.l- Proxy

:operator: .d-> HTTPADMIN
:operator: .d-> CLI


PostgreSQL <.developer : "\t"
Listener -r.> "PostgreSQL"
"Connection Pool" -r.> "PostgreSQL" : "\t\t"


note bottom of Auth
  Authenticates the user request
end note

note bottom of ApiRequest
  Parses the URL syntax
end note

note bottom of Query
  Generates the SQL
end note

note top of Listener
  LISTEN session
end note

url of Admin is [[../references/admin_server.html#admin-server]]
url of API is [[../explanations/schema_isolation.html]]
url of Auth is [[../references/auth.html#authn]]
url of Authorization is [[../explanations/db_authz.html]]
url of CLI is [[../references/cli.html#cli]]
url of "Connection Pool" is [[../references/connection_pool.html]]
url of Config is [[../references/configuration.html#configuration]]
url of HTTPADMIN is [[https://aosabook.org/en/posa/warp.html]]
url of HTTPAPI is [[https://aosabook.org/en/posa/warp.html]]
url of Listener is [[../references/listener.html#listener]]
url of Proxy is [[../explanations/nginx.html]]
url of "Schema Cache" is [[../references/schema_cache.html#schema-cache]]

@enduml