public static CompletableFuture<Channel> bootstrap(UaTcpStackClient client) {
CompletableFuture<Channel> handshake = new CompletableFuture<>();
Bootstrap bootstrap = new Bootstrap();
bootstrap
.group(Stack.sharedEventLoop())
.channel(NioSocketChannel.class)
.option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
.option(ChannelOption.TCP_NODELAY, true)
.handler(
new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel channel) throws Exception {
channel.pipeline().addLast(new UaTcpClientAcknowledgeHandler(client, handshake));
}
});
try {
URI uri = URI.create(client.getEndpointUrl());
bootstrap
.connect(uri.getHost(), uri.getPort())
.addListener(
(ChannelFuture f) -> {
if (!f.isSuccess()) {
handshake.completeExceptionally(f.cause());
}
});
} catch (Throwable t) {
UaException failure =
new UaException(
StatusCodes.Bad_TcpEndpointUrlInvalid,
"endpoint URL invalid: " + client.getEndpointUrl());
handshake.completeExceptionally(failure);
}
return handshake;
}
public class UaTcpStackClient implements UaStackClient {
private static final long DEFAULT_TIMEOUT_MS = 60000;
private final Logger logger = LoggerFactory.getLogger(getClass());
private final Map<UInteger, CompletableFuture<UaResponseMessage>> pending =
Maps.newConcurrentMap();
private final Map<UInteger, Timeout> timeouts = Maps.newConcurrentMap();
private final HashedWheelTimer wheelTimer = Stack.sharedWheelTimer();
private volatile ClientSecureChannel secureChannel;
private final ApplicationDescription application;
private final ChannelManager channelManager;
private final UaTcpStackClientConfig config;
public UaTcpStackClient(UaTcpStackClientConfig config) {
this.config = config;
application =
new ApplicationDescription(
config.getApplicationUri(),
config.getProductUri(),
config.getApplicationName(),
ApplicationType.Client,
null,
null,
null);
secureChannel = new ClientSecureChannel(SecurityPolicy.None, MessageSecurityMode.None);
channelManager = new ChannelManager(this);
}
@Override
public CompletableFuture<UaStackClient> connect() {
CompletableFuture<UaStackClient> future = new CompletableFuture<>();
channelManager
.getChannel()
.whenComplete(
(ch, ex) -> {
if (ch != null) future.complete(this);
else future.completeExceptionally(ex);
});
return future;
}
@Override
public CompletableFuture<UaStackClient> disconnect() {
channelManager.disconnect();
return CompletableFuture.completedFuture(this);
}
@SuppressWarnings("unchecked")
public <T extends UaResponseMessage> CompletableFuture<T> sendRequest(UaRequestMessage request) {
return channelManager
.getChannel()
.thenCompose(
ch -> {
CompletableFuture<T> future = new CompletableFuture<>();
RequestHeader requestHeader = request.getRequestHeader();
pending.put(
requestHeader.getRequestHandle(), (CompletableFuture<UaResponseMessage>) future);
scheduleRequestTimeout(requestHeader);
ch.writeAndFlush(request)
.addListener(
f -> {
if (!f.isSuccess()) {
UInteger requestHandle = request.getRequestHeader().getRequestHandle();
pending.remove(requestHandle);
future.completeExceptionally(f.cause());
logger.debug("Write failed, requestHandle={}", requestHandle, f.cause());
}
});
return future;
});
}
@SuppressWarnings("unchecked")
public void sendRequests(
List<? extends UaRequestMessage> requests,
List<CompletableFuture<? extends UaResponseMessage>> futures) {
Preconditions.checkArgument(
requests.size() == futures.size(), "requests and futures parameters must be same size");
channelManager
.getChannel()
.whenComplete(
(ch, ex) -> {
if (ch != null) {
Iterator<? extends UaRequestMessage> requestIterator = requests.iterator();
Iterator<CompletableFuture<? extends UaResponseMessage>> futureIterator =
futures.iterator();
while (requestIterator.hasNext() && futureIterator.hasNext()) {
UaRequestMessage request = requestIterator.next();
CompletableFuture<UaResponseMessage> future =
(CompletableFuture<UaResponseMessage>) futureIterator.next();
RequestHeader requestHeader = request.getRequestHeader();
pending.put(requestHeader.getRequestHandle(), future);
scheduleRequestTimeout(requestHeader);
}
ch.eventLoop()
.execute(
() -> {
for (UaRequestMessage request : requests) {
ch.write(request)
.addListener(
f -> {
if (!f.isSuccess()) {
UInteger requestHandle =
request.getRequestHeader().getRequestHandle();
CompletableFuture<?> future = pending.remove(requestHandle);
if (future != null) future.completeExceptionally(f.cause());
logger.debug(
"Write failed, requestHandle={}",
requestHandle,
f.cause());
}
});
}
ch.flush();
});
} else {
futures.forEach(f -> f.completeExceptionally(ex));
}
});
}
public CompletableFuture<Channel> getChannelFuture() {
return channelManager.getChannel();
}
private void scheduleRequestTimeout(RequestHeader requestHeader) {
UInteger requestHandle = requestHeader.getRequestHandle();
long timeoutHint =
requestHeader.getTimeoutHint() != null
? requestHeader.getTimeoutHint().longValue()
: DEFAULT_TIMEOUT_MS;
Timeout timeout =
wheelTimer.newTimeout(
t -> {
timeouts.remove(requestHandle);
if (!t.isCancelled()) {
CompletableFuture<UaResponseMessage> f = pending.remove(requestHandle);
if (f != null) {
String message = "request timed out after " + timeoutHint + "ms";
f.completeExceptionally(new UaException(StatusCodes.Bad_Timeout, message));
}
}
},
timeoutHint,
TimeUnit.MILLISECONDS);
timeouts.put(requestHandle, timeout);
}
public void receiveResponse(UaResponseMessage response) {
ResponseHeader header = response.getResponseHeader();
UInteger requestHandle = header.getRequestHandle();
CompletableFuture<UaResponseMessage> future = pending.remove(requestHandle);
if (future != null) {
if (header.getServiceResult().isGood()) {
future.complete(response);
} else {
ServiceFault serviceFault;
if (response instanceof ServiceFault) {
serviceFault = (ServiceFault) response;
} else {
serviceFault = new ServiceFault(header);
}
future.completeExceptionally(new UaServiceFaultException(serviceFault));
}
Timeout timeout = timeouts.remove(requestHandle);
if (timeout != null) timeout.cancel();
} else {
logger.debug(
"Received {} for unknown requestHandle: {}",
response.getClass().getSimpleName(),
requestHandle);
}
}
@Override
public Optional<X509Certificate> getCertificate() {
return config.getCertificate();
}
@Override
public Optional<KeyPair> getKeyPair() {
return config.getKeyPair();
}
@Override
public ChannelConfig getChannelConfig() {
return config.getChannelConfig();
}
@Override
public UInteger getChannelLifetime() {
return config.getChannelLifetime();
}
@Override
public ClientSecureChannel getSecureChannel() {
return secureChannel;
}
@Override
public ApplicationDescription getApplication() {
return application;
}
@Override
public Optional<EndpointDescription> getEndpoint() {
return config.getEndpoint();
}
@Override
public String getEndpointUrl() {
return config
.getEndpoint()
.map(EndpointDescription::getEndpointUrl)
.orElse(config.getEndpointUrl().orElse(""));
}
@Override
public ExecutorService getExecutorService() {
return config.getExecutor();
}
public void setSecureChannel(ClientSecureChannel secureChannel) {
this.secureChannel = secureChannel;
}
public static CompletableFuture<Channel> bootstrap(UaTcpStackClient client) {
CompletableFuture<Channel> handshake = new CompletableFuture<>();
Bootstrap bootstrap = new Bootstrap();
bootstrap
.group(Stack.sharedEventLoop())
.channel(NioSocketChannel.class)
.option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
.option(ChannelOption.TCP_NODELAY, true)
.handler(
new ChannelInitializer<SocketChannel>() {
@Override
protected void initChannel(SocketChannel channel) throws Exception {
channel.pipeline().addLast(new UaTcpClientAcknowledgeHandler(client, handshake));
}
});
try {
URI uri = URI.create(client.getEndpointUrl());
bootstrap
.connect(uri.getHost(), uri.getPort())
.addListener(
(ChannelFuture f) -> {
if (!f.isSuccess()) {
handshake.completeExceptionally(f.cause());
}
});
} catch (Throwable t) {
UaException failure =
new UaException(
StatusCodes.Bad_TcpEndpointUrlInvalid,
"endpoint URL invalid: " + client.getEndpointUrl());
handshake.completeExceptionally(failure);
}
return handshake;
}
/**
* Query the FindServers service at the given endpoint URL.
*
* <p>The endpoint URL(s) for each server {@link ApplicationDescription} returned can then be used
* in a {@link #getEndpoints(String)} call to discover the endpoints for that server.
*
* @param endpointUrl the endpoint URL to find servers at.
* @return the {@link ApplicationDescription}s returned by the FindServers service.
*/
public static CompletableFuture<ApplicationDescription[]> findServers(String endpointUrl) {
UaTcpStackClientConfig config =
UaTcpStackClientConfig.builder().setEndpointUrl(endpointUrl).build();
UaTcpStackClient client = new UaTcpStackClient(config);
FindServersRequest request =
new FindServersRequest(
new RequestHeader(null, DateTime.now(), uint(1), uint(0), null, uint(5000), null),
endpointUrl,
null,
null);
return client
.<FindServersResponse>sendRequest(request)
.whenComplete((r, ex) -> client.disconnect())
.thenApply(FindServersResponse::getServers);
}
/**
* Query the GetEndpoints service at the given endpoint URL.
*
* @param endpointUrl the endpoint URL to get endpoints from.
* @return the {@link EndpointDescription}s returned by the GetEndpoints service.
*/
public static CompletableFuture<EndpointDescription[]> getEndpoints(String endpointUrl) {
UaTcpStackClientConfig config =
UaTcpStackClientConfig.builder().setEndpointUrl(endpointUrl).build();
UaTcpStackClient client = new UaTcpStackClient(config);
GetEndpointsRequest request =
new GetEndpointsRequest(
new RequestHeader(null, DateTime.now(), uint(1), uint(0), null, uint(5000), null),
endpointUrl,
null,
new String[] {Stack.UA_TCP_BINARY_TRANSPORT_URI});
return client
.<GetEndpointsResponse>sendRequest(request)
.whenComplete((r, ex) -> client.disconnect())
.thenApply(GetEndpointsResponse::getEndpoints);
}
}