chore: load rln library

.gitignore

@@ -11,6 +11,7 @@ nimcache/
 # Build artifacts
 *.o
 *.a
+build/
 
 # OS
 .DS_Store

chat_sdk.nimble

@@ -7,7 +7,16 @@ license = "MIT"
 srcDir = "src"
 
 ### Dependencies
-requires "nim >= 2.2.4", "chronicles", "chronos", "db_connector", "flatty", "waku#nimble-fix-next"
+requires "nim >= 2.2.4", "chronicles", "chronos", "db_connector", "flatty", "waku#799793dba7ef78eba41582ed55db01a2d5d7500a"
+
+proc ensureRln(libFile: string = "build/librln.a", version = "v0.7.0") =
+  if not fileExists(libFile):
+    echo "Building RLN library..."
+    let buildDir = getCurrentDir()
+    let outFile = libFile
+    exec "bash ./scripts/build_rln.sh " & buildDir & " " & version & " " & outFile
+  else:
+    echo "RLN library already exists: " & libFile
 
 task buildSharedLib, "Build shared library for C bindings":
   exec "nim c --mm:refc --app:lib --out:../library/c-bindings/libchatsdk.so chat_sdk/chat_sdk.nim"
@@ -22,7 +31,8 @@ task segment, "Run segmentation":
   exec "nim c -r chat_sdk/segmentation.nim"
 
 task subscribe, "Run waku subscription service":
-  exec "nim c -r apps/waku_subscriber.nim"
+  ensureRln()
+  exec "nim c --passL:build/librln.a --passL:-lm -r apps/waku_subscriber.nim"
 
 task publish, "Run waku publishing service":
   exec "nim c -r apps/waku_publisher.nim"

scripts/build_rln.sh

@@ -0,0 +1,79 @@
+#!/usr/bin/env bash
+
+# This script is used to build the rln library for the current platform, or download it from the
+# release page if it is available.
+
+set -e
+
+# --- lock setup ---
+lockdir="build/rln.lock"
+mkdir -p build
+
+# try to acquire lock (atomic)
+while ! mkdir "${lockdir}" 2>/dev/null; do
+  echo "Another process is building RLN, waiting..."
+  sleep 1
+done
+
+# cleanup on exit
+cleanup() { rm -rf "${lockdir}"; }
+trap cleanup EXIT
+
+# first argument is the build directory
+build_dir=$1
+rln_version=$2
+output_filename=$3
+
+[[ -z "${build_dir}" ]]       && { echo "No build directory specified"; exit 1; }
+[[ -z "${rln_version}" ]]     && { echo "No rln version specified";     exit 1; }
+[[ -z "${output_filename}" ]] && { echo "No output filename specified"; exit 1; }
+
+if [[ -f "${output_filename}" ]]; then
+    echo "RLN library already exists: ${output_filename}, skipping build."
+    exit 0
+fi
+
+# Get the host triplet
+host_triplet=$(rustc --version --verbose | awk '/host:/{print $2}')
+
+tarball="${host_triplet}"
+
+# use arkzkey feature for v0.7.0
+# TODO: update this script in the future when arkzkey is default
+if [[ "${rln_version}" == "v0.7.0" ]]; then
+    tarball+="-arkzkey-rln.tar.gz"
+else
+    tarball+="-rln.tar.gz"
+fi
+
+# Download the prebuilt rln library if it is available
+if curl --silent --fail-with-body -L \
+  "https://github.com/vacp2p/zerokit/releases/download/$rln_version/$tarball" \
+  -o "${tarball}";
+then
+    echo "Downloaded ${tarball}"
+    tar -xzf "${tarball}"
+    mv "release/librln.a" "${output_filename}"
+    rm -rf "${tarball}" release
+else
+    echo "Failed to download ${tarball}"
+    # Build rln instead
+    # first, check if submodule version = version in Makefile
+    cargo metadata --format-version=1 --no-deps --manifest-path "${build_dir}/rln/Cargo.toml"
+
+    detected_OS=$(uname -s)
+    if [[ "$detected_OS" == MINGW* || "$detected_OS" == MSYS* ]]; then
+        submodule_version=$(cargo metadata --format-version=1 --no-deps --manifest-path "${build_dir}/rln/Cargo.toml" | sed -n 's/.*"name":"rln","version":"\([^"]*\)".*/\1/p')
+    else
+        submodule_version=$(cargo metadata --format-version=1 --no-deps --manifest-path "${build_dir}/rln/Cargo.toml" | jq -r '.packages[] | select(.name == "rln") | .version')
+    fi
+
+    if [[ "v${submodule_version}" != "${rln_version}" ]]; then
+        echo "Submodule version (v${submodule_version}) does not match version in Makefile (${rln_version})"
+        echo "Please update the submodule to ${rln_version}"
+        exit 1
+    fi
+    # if submodule version = version in Makefile, build rln
+    cargo build --release -p rln --manifest-path "${build_dir}/rln/Cargo.toml" --features arkzkey
+    cp "${build_dir}/target/release/librln.a" "${output_filename}"
+fi