feat(mix): support running as pure relay + DHT proxy

Part of https://github.com/logos-storage/logos-storage-pm/issues/13

Signed-off-by: Chrysostomos Nanakos <chris@include.gr>

storage.nim

@@ -65,14 +65,6 @@ when isMainModule:
       echo "Invalid value for --log-level. " & err.msg
     quit QuitFailure
 
-  if config.mixEnabled:
-    if config.mixPoolDir.len == 0:
-      fatal "mix-enabled requires --mix-pool-dir"
-      quit QuitFailure
-    if config.bootstrapNodes.len > 0 and config.dhtMixProxies.len == 0:
-      fatal "mix-enabled requires at least one --dht-mix-proxy"
-      quit QuitFailure
-
   if err =? config.setupMetrics().errorOption:
     fatal "Failed to start metrics server", err = err.msg
     quit QuitFailure

storage/discovery.nim

@@ -116,7 +116,7 @@ method find*(
     d: Discovery, cid: Cid
 ): Future[seq[SignedPeerRecord]] {.async: (raises: [CancelledError]), base.} =
   let providers =
-    if not d.mixProto.isNil:
+    if not d.mixProto.isNil and d.dhtMixProxies.len > 0:
       (await d.findViaMix(cid)).valueOr:
         warn "Mix lookup failed", cid, err = error.msg
         return @[]

storage/utils/mixidentity.nim

@@ -103,6 +103,9 @@ proc buildMixNodeInfo*(
   )
 
 proc loadRelayPubInfoTable*(mixPoolDir: string): ?!Table[PeerId, MixPubInfo] =
+  if mixPoolDir.len == 0:
+    return success initTable[PeerId, MixPubInfo]()
+
   let pubInfoDir = mixPoolDir / "pubInfo"
   if not dirExists(pubInfoDir):
     return failure("Relay pubInfo directory does not exist: " & pubInfoDir)
@@ -124,9 +127,6 @@ proc loadRelayPubInfoTable*(mixPoolDir: string): ?!Table[PeerId, MixPubInfo] =
     t[info.peerId] = info
     inc i
 
-  if t.len == 0:
-    return failure("No relay entries found in " & pubInfoDir)
-
   success t
 
 {.pop.}