microservice-test-bed

# install deps
npm i

# start svc and bff
npm start -w @mstb/svc
npm start -w @mstb/bff

# run test
npm start -w @mstb/cli

# run netstat to check the socket state
netstat -aon | find "9090"

Mock transient TCP state

FIN_WAIT_1 is a transient state at network/OS level. We'll need special utilities to mock it properly:

• iptable on Linux (not sure how to yet)
• clumsy on Windows

FIN_WAIT_2 would need java backend or net.server in nodeJS with allowHalfOpen set to true (index_net.js).

• In windows FIN_WAIT_2/CLOSE_WAIT will be recycled by OS automatically after couple of minutes.

Usage for clumsy

• Run step above to hit /fin_wait_1 endpoint.
• After the 200 state prints, before the timeout is over, go to clumsy and start the blocking rule.
• Go to prompt and run netstat -aon | find "9090" to we should see the expect incorrect state.
  • Rule tcp.Ack==1 and tcp.SrcPort=9090 will mock FIN_WAIT_1/ESTABLISHED state.
  • Rule tcp.Fin==1 and tcp.DstPort==9090 will mock FIN_WAIT_1/LAST_ACK state.
    • It will be hard to get FIN_WAIT_1/CLOSE_WAIT state as CLOSE_WAIT->LAST_ACK is done automatically by OOTB lib or OS.
  • For what is allowed in the tcp filter, see here.