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feat(mix): decouple libp2p peerId from RLN membership

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The node keeps its own (random) peerId and loads the SELECTED membership credential by
copying rlnKeystoreSource -> rln_keystore_<peerId>.json before mountMix. Lets many
instances share an RLN membership without colliding on a peerId. New config field
rlnKeystoreSource (parsed in client_api).
This commit is contained in:
Prem Chaitanya Prathi 2026-06-26 10:52:30 +05:30
parent ad4bdcc1a7
commit b24bc975da
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2 changed files with 22 additions and 0 deletions
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4
library/api/client_api.nim
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@ -64,6 +64,10 @@ proc createChatClient(
wakuCfg.kadBootstrapNodes = @[]
for node in config["kadBootstrapNodes"]:
wakuCfg.kadBootstrapNodes.add(node.getStr())
# Path to the chosen RLN membership keystore. The node loads this credential under
# its OWN (random) peerId, decoupling the libp2p identity from the membership.
if config.hasKey("rlnKeystoreSource"):
wakuCfg.rlnKeystoreSource = config["rlnKeystoreSource"].getStr()
if config.hasKey("minMixPoolSize"):
wakuCfg.minMixPoolSize = config["minMixPoolSize"].getInt(4)
# Adopt a fixed identity (e.g. a provisioned mix-sim chat credential) so the

18
src/chat/delivery/waku_client.nim
View File

@ -42,6 +42,7 @@ import
],
mix_rln_spam_protection/spam_protection
from std/os import copyFile
logScope:
topics = "chat waku"
@ -108,6 +109,7 @@ type WakuConfig* = object
mixEnabled*: bool
mixNodes*: seq[string]
kadBootstrapNodes*: seq[string]
rlnKeystoreSource*: string
minMixPoolSize*: int
type
@ -316,6 +318,22 @@ proc start*(client: WakuClient) {.async.} =
quit(QuitFailure)
let mixNodeInfos = parseMixNodes(client.cfg.mixNodes)
client.node.mountLightPushClient()
# Decouple the libp2p peerId from the RLN membership: the node keeps its own
# (random) peerId, but loads the SELECTED membership credential. The mix-RLN
# plugin looks up rln_keystore_<peerId>.json in cwd, so stage the chosen
# credential under THIS node's peerId. The credential is peerId-independent (only
# the filename is peerId-keyed), so many nodes can share a membership without
# colliding on a peerId.
if client.cfg.rlnKeystoreSource.len > 0:
let pid = $client.node.peerManager.switch.peerInfo.peerId
try:
copyFile(client.cfg.rlnKeystoreSource, "rln_keystore_" & pid & ".json")
info "Staged RLN membership under node peerId", peerId = pid
except CatchableError as e:
error "Failed to stage RLN credential",
source = client.cfg.rlnKeystoreSource, err = e.msg
(await client.node.mountMix(client.cfg.clusterId, mixPrivKey, mixNodeInfos,
disableSpamProtection = false)).isOkOr:
error "Failed to mount mix protocol", error = $error