Add example of ZeroMQ

lib/package.rb

@@ -0,0 +1,35 @@
+
+
+module Package
+    require_relative "package/daemon"
+    require_relative "package/client"
+
+    ENDPOINT = "ipc:///tmp/zmq-rpc-demo"
+
+    def self.make(name, scope)
+        puts "making package named: #{name} at #{scope}"
+
+        c = RpcClient.new(ENDPOINT, timeout_ms: 2000)
+        begin
+            puts "echo => #{c.call("echo", {"hello"=>"world"})}"
+            puts "add  => #{c.call("add", [1, 2, 3.5])}"
+            puts "time => #{c.call("time")}"
+        rescue ::Timeout::Error
+            warn "RPC timeout: is the daemon running and bound to #{ENDPOINT}?"
+            warn "Start it with: ruby daemon.rb   (or your systemd service)"
+        rescue => e
+            warn "RPC error: #{e.class}: #{e.message}"
+        ensure
+            c.close
+        end
+    end
+
+    def self.install(name, scope)
+        puts "making package named: #{name} at #{scope}"
+    end
+
+    # gem install ffi-rzmq
+    def self.daemon
+        start_daemon(ENDPOINT)
+    end
+end