Use libsodium in NAPI - node.js

Question

I am using a library which depends on libsodium (libpaseto). I have installed it on my machine and I am trying to build a nodejs addon.
I have the following binding.gyp file:
{
"targets": [{
"target_name": "testaddon",
"cflags!": [ "-fno-exceptions"],
"cflags_cc!": [ "-fno-exceptions" ],
"cflags_cc":["-std=c++1z" ,"-lsodium","$(pkg-config --cflags libsodium)"],
"ldflags_cc":["$(pkg-config --libs libsodium)"],
"sources": [
"cppsrc/main.cpp",
"cppsrc/functionexample.cpp",
"cppsrc/libpaseto/src/helpers.c",
"cppsrc/libpaseto/src/paseto.c",
"cppsrc/libpaseto/src/paseto_v2_local.c",
"cppsrc/libpaseto/src/paseto_v2_public.c",
],
'include_dirs': [
"<!#(node -p \"require('node-addon-api').include\")"
],
'libraries': [],
'dependencies': [
"<!(node -p \"require('node-addon-api').gyp\")"
],
'defines': [ 'NAPI_DISABLE_CPP_EXCEPTIONS' ,'SODIUM_STATIC=1',
'HAVE_LIBM=1']
}]
}
Here is the code for my addon:
#include "./headers/functionexample.h"
#include <iostream>
#include <fstream>
#include "libpaseto/include/paseto.h"
#include <exception>
Napi::Boolean addon::InitPasetoWrapped(const Napi::CallbackInfo &info)
{
bool returnValue = paseto_init();
Napi::Env env = info.Env();
return Napi::Boolean::New(env, returnValue);
}
Napi::Object addon::Init(Napi::Env env, Napi::Object exports)
{
exports.Set("add", Napi::Function::New(env, addon::addWrapped));
exports.Set("getOsName", Napi::Function::New(env, addon::getOSNameWrapped));
exports.Set("writeToFile", Napi::Function::New(env, addon::writeFileWrapped));
exports.Set("initPaseto", Napi::Function::New(env, addon::InitPasetoWrapped));
return exports;
}
I am able to compile it without a problem. I am exporting some methods in my nodejs code. However when I try to run the exported method initPaseto from my js code I get the following error:
node:symbol lookup error: undefined symbol:sodium init
How can I fix it?

Answer 1

So I finally found the answer.In the libsodium documentation it mentions that you have to pass the -lsodium flag to be able to compile without problems.So what I had to do was to add this flag in my libraries in binding.gyp. So here is my final binding.gyp file:
{
"targets": [{
"target_name": "testaddon",
"cflags!": [ "-fno-exceptions"],
"cflags_cc!": [ "-fno-exceptions" ],
"cflags_cc":["-std=c++1z"],
"sources": [
"cppsrc/main.cpp",
"cppsrc/functionexample.cpp",
"cppsrc/libpaseto/src/helpers.c",
"cppsrc/libpaseto/src/paseto.c",
"cppsrc/libpaseto/src/paseto_v2_local.c",
"cppsrc/libpaseto/src/paseto_v2_public.c",
],
'include_dirs': [
"<!#(node -p \"require('node-addon-api').include\")"
],
'libraries': ['-lsodium'],
'dependencies': [
"<!(node -p \"require('node-addon-api').gyp\")"
],
'defines': [ 'NAPI_DISABLE_CPP_EXCEPTIONS' ,'SODIUM_STATIC=1',
'HAVE_LIBM=1']
}]
}
Also this github issue helped me to understand how to add a library in my project:
https://github.com/nodejs/node-gyp/issues/328