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membership index parsing update for new register event

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This commit is contained in:
stubbsta 2025-04-03 07:54:14 +02:00
parent e35778624a
commit 92ced4437f
1 changed files with 13 additions and 4 deletions
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17
waku/waku_rln_relay/group_manager/on_chain/group_manager.nim
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@ -92,7 +92,16 @@ proc setMetadata*(
proc fetchMerkleProofElements*(
g: OnchainGroupManager
): Future[Result[seq[Uint256], string]] {.async.} =
let index = stuint(g.membershipIndex.get(), 256)
let membershipIdx = g.membershipIndex.get()
# Ensure it's within uint40 range (0 to 2^40-1)
let maxUint40 = 1099511627775'u64 # 2^40-1
if membershipIdx > maxUint40:
return err("Index exceeds uint40 range")
# Convert to Uint256 but ensure it's "clean" (no high bits set)
let index = stuint(membershipIdx, 256)
debug "fetching merkle proof for index",
index = index, membershipIndex = membershipIdx
try:
let merkleProofInvocation = g.wakuRlnContract.get().getMerkleProof(index)
let merkleProof = await merkleProofInvocation.call()
@ -258,12 +267,12 @@ method register*(
raise newException(ValueError, "register: unexpected event signature")
# the arguments of the raised event i.e., MembershipRegistered are encoded inside the data field
# data = rateCommitment encoded as 256 bits || index encoded as 32 bits
# data = rateCommitment encoded as 256 bits || membershipRateLimit encoded as 256 bits || index encoded as 32 bits
let arguments = tsReceipt.logs[2].data
debug "tx log data", arguments = arguments
let
# In TX log data, uints are encoded in big endian
membershipIndex = UInt256.fromBytesBE(arguments[32 ..^ 1])
membershipIndex = UInt256.fromBytesBE(arguments[64..95])
debug "parsed membershipIndex", membershipIndex
g.userMessageLimit = some(userMessageLimit)
@ -324,7 +333,7 @@ method generateProof*(
try:
let proofResult = waitFor g.fetchMerkleProofElements()
if proofResult.isErr():
return err("Failed to fetch Merkle proof - 2: " & $proofResult.error)
return err(" proof - 2: " & $proofResult.error)
g.merkleProofCache = proofResult.get()
debug "Merkle proof fetched",
membershipIndex = g.membershipIndex.get(), elementCount = g.merkleProofCache.len