add waku/waku_rln_relay/constants.nim file

Author: Ivansete-status

waku/waku_rln_relay/constants.nim

@@ -0,0 +1,43 @@
+import stint
+
+import ./protocol_types
+
+import ../waku_keystore
+
+# Acceptable roots for merkle root validation of incoming messages
+const AcceptableRootWindowSize* = 50
+
+# RLN membership key and index files path
+const RlnCredentialsFilename* = "rlnCredentials.txt"
+
+# inputs of the membership contract constructor
+# TODO may be able to make these constants private and put them inside the waku_rln_relay_utils
+const
+  # in wei
+  MembershipFee* = 0.u256
+  #  the current implementation of the rln lib supports a circuit for Merkle tree with depth 20
+  MerkleTreeDepth* = 20
+  EthClient* = "http://127.0.0.1:8540"
+
+const
+  # the size of poseidon hash output in bits
+  HashBitSize* = 256
+  # the size of poseidon hash output as the number hex digits
+  HashHexSize* = int(HashBitSize / 4)
+
+const DefaultRlnTreePath* = "rln_tree.db"
+
+const
+  # pre-processed "rln/waku-rln-relay/v2.0.0" to array[32, byte]
+  DefaultRlnIdentifier*: RlnIdentifier = [
+    114, 108, 110, 47, 119, 97, 107, 117, 45, 114, 108, 110, 45, 114, 101, 108, 97, 121,
+    47, 118, 50, 46, 48, 46, 48, 0, 0, 0, 0, 0, 0, 0,
+  ]
+  DefaultUserMessageLimit* = UserMessageLimit(20)
+
+const MaxClockGapSeconds* = 20.0 # the maximum clock difference between peers in seconds
+
+# RLN Keystore defaults
+const RLNAppInfo* = AppInfo(
+  application: "waku-rln-relay", appIdentifier: "01234567890abcdef", version: "0.2"
+)