lean4-htt/tests/elab/async_tcp_server_client.lean
Sofia Rodrigues 2e48cd293a
refactor: move Async and Http from Internal to Std (#13511)
This PR moves Async and Http from Internal to Std
2026-04-23 19:55:22 +00:00

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import Std.Async
import Std.Internal.UV
import Std.Net.Addr
open Std.Async
open Std.Net
-- Using this function to create IO Error. For some reason the assert! is not pausing the execution.
def assertBEq [BEq α] [ToString α] (actual expected : α) : IO Unit := do
unless actual == expected do
throw <| IO.userError <|
s!"expected '{expected}', got '{actual}'"
--------------------------------------------------------------
/-- Mike is another client. -/
def runMike (client: TCP.Socket.Client) : Async Unit := do
let mes ← client.recv? 1024
assertBEq (String.fromUTF8? =<< mes) (some "hi mike!! :)")
client.send (String.toUTF8 "hello robert!!")
client.shutdown
/-- Joe is another client. -/
def runJoe (client: TCP.Socket.Client) : Async Unit := do
let mes ← client.recv? 1024
assertBEq (String.fromUTF8? =<< mes) (some "hi joe! :)")
client.send (String.toUTF8 "hello robert!")
client.shutdown
/-- Robert is the server. -/
def runRobert (server: TCP.Socket.Server) : Async Unit := do
let joe ← server.accept
let mike ← server.accept
joe.send (String.toUTF8 "hi joe! :)")
let mes ← joe.recv? 1024
assertBEq (String.fromUTF8? =<< mes) (some "hello robert!")
mike.send (String.toUTF8 "hi mike!! :)")
let mes ← mike.recv? 1024
assertBEq (String.fromUTF8? =<< mes) (some "hello robert!!")
pure ()
def clientServer (addr : SocketAddress) : IO Unit := do
let server ← TCP.Socket.Server.mk
server.bind addr
server.listen 128
let serverTask := runRobert server
let serverTask ← serverTask.toIO
assertBEq (← server.getSockName).port addr.port
let joe ← TCP.Socket.Client.mk
let task ← joe.connect addr |>.toBaseIO
task.block
assertBEq (← joe.getPeerName).port addr.port
joe.noDelay
let mike ← TCP.Socket.Client.mk
let task ← mike.connect addr |>.toBaseIO
task.block
assertBEq (← mike.getPeerName).port addr.port
mike.noDelay
let joeTask := runJoe joe
let mikeTask := runMike mike
let joeTask ← joeTask.toIO
let mikeTask ← mikeTask.toIO
serverTask.block
joeTask.block
mikeTask.block
#eval clientServer (SocketAddressV4.mk (.ofParts 127 0 0 1) 8084)
#eval clientServer (SocketAddressV6.mk (.ofParts 0 0 0 0 0 0 0 1) 9000)