build: automate mix RLN v2.0.0 build and linking for mix binaries

Author: chaitanyaprem

Makefile

@@ -187,10 +187,15 @@ nimbus-build-system-nimble-dir:
 ##################
 ##     RLN      ##
 ##################
-.PHONY: librln
+.PHONY: librln mix-librln
 
 LIBRLN_BUILDDIR := $(CURDIR)/vendor/zerokit
 LIBRLN_VERSION := v0.9.0
+MIX_LIBRLN_VERSION ?= v2.0.0
+MIX_LIBRLN_REPO ?= https://github.com/vacp2p/zerokit.git
+MIX_LIBRLN_SRCDIR ?= $(CURDIR)/build/zerokit_$(MIX_LIBRLN_VERSION)
+MIX_LIBRLN_FILE ?= $(CURDIR)/build/librln_mix_$(MIX_LIBRLN_VERSION).a
+MIX_LIBRLN_NIM_PARAMS := --passL:$(MIX_LIBRLN_FILE) --passL:-lm
 
 ifeq ($(detected_OS),Windows)
 LIBRLN_FILE ?= rln.lib
@@ -202,12 +207,19 @@ $(LIBRLN_FILE):
 	echo -e $(BUILD_MSG) "$@" && \
 		./scripts/build_rln.sh $(LIBRLN_BUILDDIR) $(LIBRLN_VERSION) $(LIBRLN_FILE)
 
+$(MIX_LIBRLN_FILE):
+	echo -e $(BUILD_MSG) "$@" && \
+		./scripts/build_rln_mix.sh $(MIX_LIBRLN_SRCDIR) $(MIX_LIBRLN_VERSION) $(MIX_LIBRLN_FILE) $(MIX_LIBRLN_REPO)
+
 librln: | $(LIBRLN_FILE)
 	$(eval NIM_PARAMS += --passL:$(LIBRLN_FILE) --passL:-lm)
 
+mix-librln: | $(MIX_LIBRLN_FILE)
+
 clean-librln:
 	cargo clean --manifest-path vendor/zerokit/rln/Cargo.toml
 	rm -f $(LIBRLN_FILE)
+	rm -f $(MIX_LIBRLN_FILE)
 
 # Extend clean target
 clean: | clean-librln
@@ -232,10 +244,10 @@ testwaku: | build deps rln-deps librln
 	echo -e $(BUILD_MSG) "build/$@" && \
 		$(ENV_SCRIPT) nim test -d:os=$(shell uname) $(NIM_PARAMS) waku.nims
 
-wakunode2: | build deps librln
+wakunode2: | build deps librln mix-librln
 	echo -e $(BUILD_MSG) "build/$@" && \
 	\
-		$(ENV_SCRIPT) nim wakunode2 $(NIM_PARAMS) waku.nims
+		$(ENV_SCRIPT) nim wakunode2 $(NIM_PARAMS) $(MIX_LIBRLN_NIM_PARAMS) waku.nims
 
 benchmarks: | build deps librln
 	echo -e $(BUILD_MSG) "build/$@" && \
@@ -253,9 +265,9 @@ chat2: | build deps librln
 	echo -e $(BUILD_MSG) "build/$@" && \
 		$(ENV_SCRIPT) nim chat2 $(NIM_PARAMS) waku.nims
 
-chat2mix: | build deps librln
+chat2mix: | build deps librln mix-librln
 	echo -e $(BUILD_MSG) "build/$@" && \
-		$(ENV_SCRIPT) nim chat2mix $(NIM_PARAMS) waku.nims
+		$(ENV_SCRIPT) nim chat2mix $(NIM_PARAMS) $(MIX_LIBRLN_NIM_PARAMS) waku.nims
 
 rln-db-inspector: | build deps librln
 	echo -e $(BUILD_MSG) "build/$@" && \

scripts/build_rln_mix.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+# Build a separate, pinned RLN library for mix spam-protection usage.
+# This keeps the main nwaku RLN dependency flow unchanged.
+
+set -euo pipefail
+
+source_dir="${1:-}"
+version="${2:-}"
+output_file="${3:-}"
+repo_url="${4:-https://github.com/vacp2p/zerokit.git}"
+
+if [[ -z "${source_dir}" || -z "${version}" || -z "${output_file}" ]]; then
+  echo "Usage: $0 <source_dir> <version_tag> <output_file> [repo_url]"
+  exit 1
+fi
+
+mkdir -p "$(dirname "${source_dir}")"
+mkdir -p "$(dirname "${output_file}")"
+
+if [[ ! -d "${source_dir}/.git" ]]; then
+  echo "Cloning zerokit ${version} from ${repo_url}..."
+  if [[ -e "${source_dir}" ]]; then
+    echo "Path exists but is not a git repository: ${source_dir}"
+    echo "Please remove it and retry."
+    exit 1
+  fi
+  git clone --depth 1 --branch "${version}" "${repo_url}" "${source_dir}"
+else
+  echo "Using existing zerokit checkout in ${source_dir}"
+  current_tag="$(git -C "${source_dir}" describe --tags --exact-match 2>/dev/null || true)"
+  if [[ "${current_tag}" != "${version}" ]]; then
+    echo "Updating zerokit checkout to ${version}..."
+    git -C "${source_dir}" fetch --tags origin "${version}"
+    git -C "${source_dir}" checkout --detach "${version}"
+  fi
+fi
+
+echo "Building mix RLN library from source (version ${version})..."
+cargo build --release -p rln --manifest-path "${source_dir}/rln/Cargo.toml"
+
+cp "${source_dir}/target/release/librln.a" "${output_file}"
+echo "Successfully built ${output_file}"