broker

README

Broker

Workflow

gRPC Recv

• if evt has expired
  • drop evt
• else if evt has compId
  • if brk has sub for compId
    • put evt on sub's sendCh
  • else
    • put evt on jetstream's sendCh
• else if brk has sub group for comp
  • put evt on sub group's sendCh
• else
  • put evt on jetstream's sendCh
• put evt on comp's archive jetstream subject (disk)

gRPC Send

• if evt has expired
  • drop evt
• else
  • send evt to component via gRPC stream.Send()

JetStream Recv

• if evt has expired
  • drop evt
  • ack jetstream
• else if evt has compId
  • if brk has sub for compId
    • put evt on sub's sendCh
    • wait for evt to be processed
    • ack jetstream
• else if brk has sub group for comp
  • put evt on sub group's sendCh
  • wait for evt to be processed
  • ack jetstream
• else
  • nack jetstream
  • drop evt (error state, broker should not have been subscribed, log warn, and clean jetstream subs)

JetStream Send

• if evt has expired
  • drop evt
• else if evt has compId
  • put evt on compId's stream (memory)
• else
  • put evt on comp's stream (memory)

HTTP Srv Recv

HTTP Srv creates a subscription as if it is a component.

• convert http req to evt
• if evt has compId
  • if brk has sub for compId
    • put evt on sub's sendCh
  • else
    • put evt on jetstream's sendCh
• else if brk has sub group for comp
  • put evt on sub group's sendCh
• else
  • put evt on jetstream's sendCh
• put evt on comp's archive jetstream subject (disk)
• wait for resp
• send resp http resp

HTTP Client Recv

HTTP Client creates a subscription as if it is a component.

• convert evt to http req
• send http req to external http srv
• wait for response
• convert resp to evt
• if brk has sub for compId
  • put evt on sub's sendCh
• else
  • drop evt (the src of req should always be on same node, if gone means it unsubscribed while http request was being processed)
• put evt on comp's archive jetstream subject (disk)

Component Auth