request_flow.d2

direction: down

title: Request Flow with Audit Trail (untuned) {
  near: top-center
  shape: text
  style.font-size: 22
  style.bold: true
}

flow: "" {
  direction: right
  style.fill: transparent
  style.stroke: transparent

  service: Primary Service {
    direction: down
    style.fill: "#eef6ff"
    style.stroke: "#6699cc"

    receive: RECEIVE REQUEST {style.fill: "#ddeeff"}
    auth: AUTHENTICATE {style.fill: "#ddeeff"}
    rate_limit: RATE-LIMIT CHECK {style.fill: "#ddeeff"}
    validate: VALIDATE PAYLOAD {style.fill: "#ddeeff"}
    process: PROCESS {style.fill: "#FFD700"; style.bold: true}
    serialize: SERIALIZE RESPONSE {style.fill: "#ddeeff"}
    respond: RESPOND {style.fill: "#90EE90"; style.bold: true}

    receive -> auth
    auth -> rate_limit
    rate_limit -> validate
    validate -> process
    process -> serialize
    serialize -> respond
  }

  audit: Audit Trail {
    direction: down
    style.fill: "#fdf5e6"
    style.stroke: "#d4a017"

    log_in: LOG INBOUND {style.fill: "#ffeebb"}
    log_decision: LOG DECISION {style.fill: "#ffeebb"}
    log_out: LOG OUTBOUND {style.fill: "#ffeebb"}

    log_in -> log_decision
    log_decision -> log_out
  }
}

flow.service.receive -> flow.audit.log_in: write
flow.service.validate -> flow.audit.log_decision: write
flow.service.respond -> flow.audit.log_out: write