nixos/ejabberd: Integrate go-sendxmpp into test

nixos/tests/xmpp/ejabberd.nix

@@ -2,7 +2,7 @@ let
   cert =
     pkgs:
     pkgs.runCommand "selfSignedCerts" { buildInputs = [ pkgs.openssl ]; } ''
-      openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -nodes -subj '/CN=example.com/CN=muc.example.com/CN=matrix.example.com' -days 36500
+      openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -nodes -subj '/CN=example.com/CN=muc.example.com/CN=matrix.example.com' -addext "subjectAltName = DNS:example.com,DNS:muc.example.com,DNS:matrix.example.com" -days 36500
       mkdir -p $out
       cp key.pem cert.pem $out
     '';
@@ -14,7 +14,18 @@ in
     maintainers = [ ];
   };
   nodes = {
-    client =
+    client-a =
+      { nodes, pkgs, ... }:
+      {
+        security.pki.certificateFiles = [ "${cert pkgs}/cert.pem" ];
+        networking.extraHosts = ''
+          ${nodes.server.networking.primaryIPAddress} example.com
+        '';
+
+        imports = [ ./go-sendxmpp-listen.nix ];
+      };
+
+    client-b =
       { nodes, pkgs, ... }:
       {
         security.pki.certificateFiles = [ "${cert pkgs}/cert.pem" ];
@@ -28,6 +39,7 @@ in
           })
         ];
       };
+
     server =
       { config, pkgs, ... }:
       {
@@ -310,7 +322,18 @@ in
           ejabberd_prefix + "register cthon98 example.com nothunter2",
       )
       server.fail(ejabberd_prefix + "register asdf wrong.domain")
-      client.succeed("send-message")
+
+      for machine in client_a, client_b:
+        machine.systemctl("start network-online.target")
+        machine.wait_for_unit("network-online.target")
+
+      client_a.wait_for_unit("go-sendxmpp-listen")
+      client_b.succeed("send-message")
+
+      client_a.wait_until_succeeds(
+        "journalctl -o cat -u go-sendxmpp-listen.service | grep 'cthon98@example.com: Hello, this is dog.'"
+      )
+
       server.succeed(
           ejabberd_prefix + "unregister cthon98 example.com",
           ejabberd_prefix + "unregister azurediamond example.com",

nixos/tests/xmpp/go-sendxmpp-listen.nix

@@ -0,0 +1,22 @@
+{ lib, pkgs, ... }:
+
+{
+  systemd.services.go-sendxmpp-listen = {
+    after = [ "network-online.target" ];
+    requires = [ "network-online.target" ];
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      ExecStart = ''
+        ${lib.getExe pkgs.go-sendxmpp} --username azurediamond@example.com --password hunter2 --listen
+      '';
+      Environment = [
+        "HOME=/var/lib/go-sendxmpp/"
+      ];
+      DynamicUser = true;
+      Restart = "on-failure";
+      RestartSec = "5s";
+      StateDirectory = "go-sendxmpp";
+    };
+  };
+}