Refactor stack and transport layers (#1078)

Deletes the stack-client and stack-server modules and corresponding UaStackClient and UaStackServer.

Introduces new transport abstractions and implementations, with HTTPS and WS implementations in their own modules to avoid the unnecessary dependencies they brought even when not being used.

milo-examples/client-examples/src/main/java/org/eclipse/milo/examples/client/ClientExampleRunner.java

@@ -22,15 +22,13 @@
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.eclipse.milo.examples.server.ExampleServer;
 import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
-import org.eclipse.milo.opcua.stack.client.security.DefaultClientCertificateValidator;
 import org.eclipse.milo.opcua.stack.core.Stack;
+import org.eclipse.milo.opcua.stack.core.security.DefaultClientCertificateValidator;
 import org.eclipse.milo.opcua.stack.core.security.DefaultTrustListManager;
 import org.eclipse.milo.opcua.stack.core.types.builtin.LocalizedText;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.uint;
-
 public class ClientExampleRunner {
 
     static {
@@ -90,17 +88,16 @@ private OpcUaClient createClient() throws Exception {
                 endpoints.stream()
                     .filter(clientExample.endpointFilter())
                     .findFirst(),
-            configBuilder ->
-                configBuilder
+            transportConfigBuilder -> {},
+            clientConfigBuilder ->
+                clientConfigBuilder
                     .setApplicationName(LocalizedText.english("eclipse milo opc-ua client"))
                     .setApplicationUri("urn:eclipse:milo:examples:client")
                     .setKeyPair(loader.getClientKeyPair())
                     .setCertificate(loader.getClientCertificate())
                     .setCertificateChain(loader.getClientCertificateChain())
                     .setCertificateValidator(certificateValidator)
                     .setIdentityProvider(clientExample.getIdentityProvider())
-                    .setRequestTimeout(uint(5000))
-                    .build()
         );
     }
 

milo-examples/server-examples/src/main/java/org/eclipse/milo/examples/server/ExampleServer.java

@@ -26,6 +26,7 @@
 
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 import org.eclipse.milo.opcua.sdk.server.OpcUaServer;
+import org.eclipse.milo.opcua.sdk.server.api.config.EndpointConfig;
 import org.eclipse.milo.opcua.sdk.server.api.config.OpcUaServerConfig;
 import org.eclipse.milo.opcua.sdk.server.identity.CompositeValidator;
 import org.eclipse.milo.opcua.sdk.server.identity.UsernameIdentityValidator;
@@ -34,6 +35,7 @@
 import org.eclipse.milo.opcua.stack.core.StatusCodes;
 import org.eclipse.milo.opcua.stack.core.UaRuntimeException;
 import org.eclipse.milo.opcua.stack.core.security.DefaultCertificateManager;
+import org.eclipse.milo.opcua.stack.core.security.DefaultServerCertificateValidator;
 import org.eclipse.milo.opcua.stack.core.security.DefaultTrustListManager;
 import org.eclipse.milo.opcua.stack.core.security.SecurityPolicy;
 import org.eclipse.milo.opcua.stack.core.transport.TransportProfile;
@@ -43,8 +45,8 @@
 import org.eclipse.milo.opcua.stack.core.types.structured.BuildInfo;
 import org.eclipse.milo.opcua.stack.core.util.CertificateUtil;
 import org.eclipse.milo.opcua.stack.core.util.NonceUtil;
-import org.eclipse.milo.opcua.stack.server.EndpointConfiguration;
-import org.eclipse.milo.opcua.stack.server.security.DefaultServerCertificateValidator;
+import org.eclipse.milo.opcua.stack.transport.server.tcp.OpcTcpServerTransport;
+import org.eclipse.milo.opcua.stack.transport.server.tcp.OpcTcpServerTransportConfig;
 import org.slf4j.LoggerFactory;
 
 import static org.eclipse.milo.opcua.sdk.server.api.config.OpcUaServerConfig.USER_TOKEN_POLICY_ANONYMOUS;
@@ -142,7 +144,7 @@ public ExampleServer() throws Exception {
                 )
             );
 
-        Set<EndpointConfiguration> endpointConfigurations = createEndpointConfigurations(certificate);
+        Set<EndpointConfig> endpointConfigurations = createEndpointConfigs(certificate);
 
         OpcUaServerConfig serverConfig = OpcUaServerConfig.builder()
             .setApplicationUri(applicationUri)
@@ -162,14 +164,21 @@ public ExampleServer() throws Exception {
             .setProductUri("urn:eclipse:milo:example-server")
             .build();
 
-        server = new OpcUaServer(serverConfig);
+        server = new OpcUaServer(serverConfig, transportProfile -> {
+            assert transportProfile == TransportProfile.TCP_UASC_UABINARY;
+
+            OpcTcpServerTransportConfig transportConfig =
+                OpcTcpServerTransportConfig.newBuilder().build();
+
+            return new OpcTcpServerTransport(transportConfig);
+        });
 
         exampleNamespace = new ExampleNamespace(server);
         exampleNamespace.startup();
     }
 
-    private Set<EndpointConfiguration> createEndpointConfigurations(X509Certificate certificate) {
-        var endpointConfigurations = new LinkedHashSet<EndpointConfiguration>();
+    private Set<EndpointConfig> createEndpointConfigs(X509Certificate certificate) {
+        var endpointConfigs = new LinkedHashSet<EndpointConfig>();
 
         List<String> bindAddresses = List.of("0.0.0.0");
 
@@ -179,7 +188,7 @@ private Set<EndpointConfiguration> createEndpointConfigurations(X509Certificate
 
         for (String bindAddress : bindAddresses) {
             for (String hostname : hostnames) {
-                EndpointConfiguration.Builder builder = EndpointConfiguration.newBuilder()
+                EndpointConfig.Builder builder = EndpointConfig.newBuilder()
                     .setBindAddress(bindAddress)
                     .setHostname(hostname)
                     .setPath("/milo")
@@ -191,14 +200,14 @@ private Set<EndpointConfiguration> createEndpointConfigurations(X509Certificate
                     );
 
 
-                EndpointConfiguration.Builder noSecurityBuilder = builder.copy()
+                EndpointConfig.Builder noSecurityBuilder = builder.copy()
                     .setSecurityPolicy(SecurityPolicy.None)
                     .setSecurityMode(MessageSecurityMode.None);
 
-                endpointConfigurations.add(buildTcpEndpoint(noSecurityBuilder));
+                endpointConfigs.add(buildTcpEndpoint(noSecurityBuilder));
 
                 // TCP Basic256Sha256 / SignAndEncrypt
-                endpointConfigurations.add(buildTcpEndpoint(
+                endpointConfigs.add(buildTcpEndpoint(
                     builder.copy()
                         .setSecurityPolicy(SecurityPolicy.Basic256Sha256)
                         .setSecurityMode(MessageSecurityMode.SignAndEncrypt))
@@ -215,19 +224,19 @@ private Set<EndpointConfiguration> createEndpointConfigurations(X509Certificate
                  * its base address.
                  */
 
-                EndpointConfiguration.Builder discoveryBuilder = builder.copy()
+                EndpointConfig.Builder discoveryBuilder = builder.copy()
                     .setPath("/milo/discovery")
                     .setSecurityPolicy(SecurityPolicy.None)
                     .setSecurityMode(MessageSecurityMode.None);
 
-                endpointConfigurations.add(buildTcpEndpoint(discoveryBuilder));
+                endpointConfigs.add(buildTcpEndpoint(discoveryBuilder));
             }
         }
 
-        return endpointConfigurations;
+        return endpointConfigs;
     }
 
-    private static EndpointConfiguration buildTcpEndpoint(EndpointConfiguration.Builder base) {
+    private static EndpointConfig buildTcpEndpoint(EndpointConfig.Builder base) {
         return base.copy()
             .setTransportProfile(TransportProfile.TCP_UASC_UABINARY)
             .setBindPort(TCP_BIND_PORT)