From 0d69a0eefb3d604e491188a38df1ad75e38ed7f8 Mon Sep 17 00:00:00 2001
From: Philipp Jungkamp <Philipp.Jungkamp@opal-rt.com>
Date: Mon, 12 Jun 2023 17:57:04 +0200
Subject: [PATCH] packaging-nix: add libdatachannel for webrtc node

Signed-off-by: Philipp Jungkamp <Philipp.Jungkamp@opal-rt.com>
---
 packaging/nix/flake.lock         | 20 ++++++++++++++++++++
 packaging/nix/flake.nix          | 14 +++++++++++++-
 packaging/nix/libdatachannel.nix | 19 +++++++++++++++++++
 packaging/nix/villas.nix         |  3 +++
 4 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 packaging/nix/libdatachannel.nix

diff --git a/packaging/nix/flake.lock b/packaging/nix/flake.lock
index 0a88ba39e..cf50b6fb7 100644
--- a/packaging/nix/flake.lock
+++ b/packaging/nix/flake.lock
@@ -51,6 +51,25 @@
         "type": "github"
       }
     },
+    "libdatachannel": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1683797946,
+        "narHash": "sha256-kSK+5gFMG6tq89R1m08gNBKPdwyR/mLEDhWXQ/uk34o=",
+        "ref": "refs/tags/v0.18.4",
+        "rev": "7a5e01071ae635e06f175233abd11d623f09cbb8",
+        "revCount": 2459,
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/paullouisageneau/libdatachannel.git"
+      },
+      "original": {
+        "ref": "refs/tags/v0.18.4",
+        "submodules": true,
+        "type": "git",
+        "url": "https://github.com/paullouisageneau/libdatachannel.git"
+      }
+    },
     "libiec61850": {
       "flake": false,
       "locked": {
@@ -88,6 +107,7 @@
         "common": "common",
         "fpga": "fpga",
         "lib60870": "lib60870",
+        "libdatachannel": "libdatachannel",
         "libiec61850": "libiec61850",
         "nixpkgs": "nixpkgs"
       }
diff --git a/packaging/nix/flake.nix b/packaging/nix/flake.nix
index 9e44ff140..70c21e9bf 100644
--- a/packaging/nix/flake.nix
+++ b/packaging/nix/flake.nix
@@ -19,6 +19,14 @@
       flake = false;
     };
 
+    libdatachannel = {
+      type = "git";
+      url = "https://github.com/paullouisageneau/libdatachannel.git";
+      ref = "refs/tags/v0.18.4";
+      submodules = true;
+      flake = false;
+    };
+
     libiec61850 = {
       url = "github:mz-automation/libiec61850/v1.5.1";
       flake = false;
@@ -79,6 +87,10 @@
         src = inputs.lib60870;
       };
 
+      libdatachannel = pkgs.callPackage ./libdatachannel.nix {
+        src = inputs.libdatachannel;
+      };
+
       libiec61850 = pkgs.callPackage ./libiec61850.nix {
         src = inputs.libiec61850;
       };
@@ -98,7 +110,7 @@
 
     # standard flake attribute allowing you to add the villas packages to your nixpkgs
     overlays = {
-        default = overlay;
+      default = overlay;
     };
 
     # standard flake attribute for defining developer environments
diff --git a/packaging/nix/libdatachannel.nix b/packaging/nix/libdatachannel.nix
new file mode 100644
index 000000000..64aec66e5
--- /dev/null
+++ b/packaging/nix/libdatachannel.nix
@@ -0,0 +1,19 @@
+{
+  cmake,
+  lib,
+  stdenv,
+  src,
+  openssl,
+}:
+stdenv.mkDerivation {
+  pname = "libdatachannel";
+  version = "villas";
+  src = src;
+  nativeBuildInputs = [cmake];
+  buildInputs = [openssl];
+  meta = with lib; {
+    description = "C/C++ WebRTC network library featuring Data Channels, Media Transport, and WebSockets";
+    homepage = "https://libdatachannel.org/";
+    license = licenses.mpl20;
+  };
+}
diff --git a/packaging/nix/villas.nix b/packaging/nix/villas.nix
index 3c44f0446..803df8cbb 100644
--- a/packaging/nix/villas.nix
+++ b/packaging/nix/villas.nix
@@ -24,6 +24,7 @@
   withNodeSocket ? withAllNodes,
   withNodeTemper ? withAllNodes,
   withNodeUldaq ? withAllNodes,
+  withNodeWebrtc ? withAllNodes,
   withNodeZeromq ? withAllNodes,
   # minimal dependencies
   cmake,
@@ -43,6 +44,7 @@
   jansson,
   lib60870,
   libconfig,
+  libdatachannel,
   libiec61850,
   libnl,
   libre,
@@ -117,6 +119,7 @@ stdenv.mkDerivation {
     ++ lib.optionals withNodeSocket [libnl]
     ++ lib.optionals withNodeTemper [libusb]
     ++ lib.optionals withNodeUldaq [libuldaq]
+    ++ lib.optionals withNodeWebrtc [libdatachannel]
     ++ lib.optionals withNodeZeromq [czmq libsodium];
   meta = with lib; {
     mainProgram = "villas";