initial integration of mp channel

library/waku_thread/waku_thread.nim

@@ -6,13 +6,11 @@ import std/[options, atomics, os, net]
 import chronicles, chronos, chronos/threadsync, taskpools/channels_spsc_single, results
 import waku/factory/waku, ./inter_thread_communication/waku_thread_request, ../ffi_types
 
+const MaxChannelItems = 1000
+
 type WakuContext* = object
   thread: Thread[(ptr WakuContext)]
-  reqChannel: ChannelSPSCSingle[ptr WakuThreadRequest]
-  reqSignal: ThreadSignalPtr
-    # to inform The Waku Thread (a.k.a TWT) that a new request is sent
-  reqReceivedSignal: ThreadSignalPtr
-    # to inform the main thread that the request is rx by TWT
+  reqChannel: Channel[ptr WakuThreadRequest]
   userData*: pointer
   eventCallback*: pointer
   eventUserdata*: pointer
@@ -28,21 +26,16 @@ proc runWaku(ctx: ptr WakuContext) {.async.} =
   var waku: Waku
 
   while true:
-    await ctx.reqSignal.wait()
-
     if ctx.running.load == false:
       break
 
-    ## Trying to get a request from the libwaku requestor thread
     var request: ptr WakuThreadRequest
-    let recvOk = ctx.reqChannel.tryRecv(request)
-    if not recvOk:
-      error "waku thread could not receive a request"
-      continue
-
-    let fireRes = ctx.reqReceivedSignal.fireSync()
-    if fireRes.isErr():
-      error "could not fireSync back to requester thread", error = fireRes.error
+    try:
+      echo "----------- before receive"
+      request = ctx.reqChannel.recv()
+      echo "----------- after receive"
+    except Exception:
+      error "exception trying to receive a request"
 
     ## Handle the request
     asyncSpawn WakuThreadRequest.process(request, addr waku)
@@ -55,10 +48,7 @@ proc createWakuThread*(): Result[ptr WakuContext, string] =
   ## This proc is called from the main thread and it creates
   ## the Waku working thread.
   var ctx = createShared(WakuContext, 1)
-  ctx.reqSignal = ThreadSignalPtr.new().valueOr:
-    return err("couldn't create reqSignal ThreadSignalPtr")
-  ctx.reqReceivedSignal = ThreadSignalPtr.new().valueOr:
-    return err("couldn't create reqReceivedSignal ThreadSignalPtr")
+  ctx.reqChannel.open(MaxChannelItems)
 
   ctx.running.store(true)
 
@@ -75,14 +65,8 @@ proc createWakuThread*(): Result[ptr WakuContext, string] =
 proc destroyWakuThread*(ctx: ptr WakuContext): Result[void, string] =
   ctx.running.store(false)
 
-  let signaledOnTime = ctx.reqSignal.fireSync().valueOr:
-    return err("error in destroyWakuThread: " & $error)
-  if not signaledOnTime:
-    return err("failed to signal reqSignal on time in destroyWakuThread")
-
   joinThread(ctx.thread)
-  ?ctx.reqSignal.close()
-  ?ctx.reqReceivedSignal.close()
+  ctx.reqChannel.close()
   freeShared(ctx)
 
   return ok()
@@ -95,26 +79,10 @@ proc sendRequestToWakuThread*(
     userData: pointer,
 ): Result[void, string] =
   let req = WakuThreadRequest.createShared(reqType, reqContent, callback, userData)
-  ## Sending the request
-  let sentOk = ctx.reqChannel.trySend(req)
-  if not sentOk:
-    deallocShared(req)
-    return err("Couldn't send a request to the waku thread: " & $req[])
-
-  let fireSyncRes = ctx.reqSignal.fireSync()
-  if fireSyncRes.isErr():
-    deallocShared(req)
-    return err("failed fireSync: " & $fireSyncRes.error)
-
-  if fireSyncRes.get() == false:
-    deallocShared(req)
-    return err("Couldn't fireSync in time")
-
-  ## wait until the Waku Thread properly received the request
-  let res = ctx.reqReceivedSignal.waitSync()
-  if res.isErr():
-    deallocShared(req)
-    return err("Couldn't receive reqReceivedSignal signal")
+  ## Sending the request, blocks if the channel is full
+  echo "--------- before send reqType: ", $RequestType
+  ctx.reqChannel.send(req)
+  echo "--------- after reqType: ", $RequestType
 
   ## Notice that in case of "ok", the deallocShared(req) is performed by the Waku Thread in the
   ## process proc.