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com.digitalpetri.enip.cip.CipClient Maven / Gradle / Ivy
package com.digitalpetri.enip.cip;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Consumer;
import com.digitalpetri.enip.EtherNetIpClient;
import com.digitalpetri.enip.EtherNetIpClientConfig;
import com.digitalpetri.enip.cip.epath.EPath;
import com.digitalpetri.enip.cip.services.CipService;
import com.digitalpetri.enip.cip.services.CipServiceInvoker;
import com.digitalpetri.enip.cip.services.UnconnectedSendService;
import com.digitalpetri.enip.commands.SendRRData;
import com.digitalpetri.enip.commands.SendUnitData;
import com.digitalpetri.enip.cpf.ConnectedAddressItem;
import com.digitalpetri.enip.cpf.ConnectedDataItemRequest;
import com.digitalpetri.enip.cpf.ConnectedDataItemResponse;
import com.digitalpetri.enip.cpf.CpfItem;
import com.digitalpetri.enip.cpf.CpfPacket;
import com.digitalpetri.enip.cpf.NullAddressItem;
import com.digitalpetri.enip.cpf.UnconnectedDataItemRequest;
import com.digitalpetri.enip.cpf.UnconnectedDataItemResponse;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import io.netty.buffer.ByteBuf;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.Timeout;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CipClient extends EtherNetIpClient implements CipServiceInvoker {
private final Logger logger = LoggerFactory.getLogger(getClass());
private final ConnectedDataHandler connectedDataHandler = new ConnectedDataHandler();
private final List additionalHandlers = Lists.newCopyOnWriteArrayList();
private final Map> pending = Maps.newConcurrentMap();
private final Map timeouts = Maps.newConcurrentMap();
private final AtomicInteger sequenceNumber = new AtomicInteger(0);
private final EPath.PaddedEPath connectionPath;
public CipClient(EtherNetIpClientConfig config, EPath.PaddedEPath connectionPath) {
super(config);
this.connectionPath = connectionPath;
}
@Override
public CompletableFuture invokeConnected(int connectionId, CipService service) {
CompletableFuture future = new CompletableFuture<>();
return invokeConnected(connectionId, service, future);
}
private CompletableFuture invokeConnected(int connectionId,
CipService service,
CompletableFuture future) {
sendConnectedData(service::encodeRequest, connectionId).whenComplete((buffer, ex) -> {
if (buffer != null) {
try {
T response = service.decodeResponse(buffer);
future.complete(response);
} catch (CipService.PartialResponseException e) {
invokeConnected(connectionId, service, future);
} catch (CipResponseException e) {
future.completeExceptionally(e);
} finally {
ReferenceCountUtil.release(buffer);
}
} else {
future.completeExceptionally(ex);
}
});
return future;
}
@Override
public CompletableFuture invokeUnconnected(CipService service) {
return invokeUnconnected(service, 0);
}
@Override
public CompletableFuture invokeUnconnected(CipService service, int maxRetries) {
CompletableFuture future = new CompletableFuture<>();
UnconnectedSendService uss = new UnconnectedSendService(
service,
connectionPath,
getConfig().getTimeout()
);
return invokeUnconnected(uss, future, 0, maxRetries);
}
private CompletableFuture invokeUnconnected(CipService service,
CompletableFuture future,
int count, int max) {
sendUnconnectedData(service::encodeRequest).whenComplete((buffer, ex) -> {
if (buffer != null) {
try {
T response = service.decodeResponse(buffer);
future.complete(response);
} catch (CipService.PartialResponseException e) {
invokeUnconnected(service, future, count, max);
} catch (CipResponseException e) {
if (e.getGeneralStatus() == 0x01) {
boolean requestTimedOut = Arrays.stream(e.getAdditionalStatus()).anyMatch(i -> i == 0x0204);
if (requestTimedOut && count < max) {
logger.debug("Unconnected request timed out; retrying, count={}, max={}", count, max);
invokeUnconnected(service, future, count + 1, max);
} else {
future.completeExceptionally(e);
}
} else {
future.completeExceptionally(e);
}
} finally {
ReferenceCountUtil.release(buffer);
}
} else {
future.completeExceptionally(ex);
}
});
return future;
}
public CompletableFuture sendConnectedData(ByteBuf data, int connectionId) {
return sendConnectedData((buffer) -> buffer.writeBytes(data), connectionId);
}
public CompletableFuture sendConnectedData(Consumer dataEncoder, int connectionId) {
CompletableFuture future = new CompletableFuture<>();
ConnectedAddressItem addressItem = new ConnectedAddressItem(connectionId);
int sequenceNumber = nextSequenceNumber();
ConnectedDataItemRequest dataItem = new ConnectedDataItemRequest((b) -> {
b.writeShort(sequenceNumber);
dataEncoder.accept(b);
});
CpfPacket packet = new CpfPacket(addressItem, dataItem);
SendUnitData command = new SendUnitData(packet);
Timeout timeout = getConfig().getWheelTimer().newTimeout(tt -> {
if (tt.isCancelled()) return;
CompletableFuture f = pending.remove(sequenceNumber);
if (f != null) {
String message = String.format("sequenceNumber=%s timed out waiting %sms for response",
sequenceNumber, getConfig().getTimeout().toMillis());
f.completeExceptionally(new Exception(message));
}
}, getConfig().getTimeout().toMillis(), TimeUnit.MILLISECONDS);
pending.put(sequenceNumber, future);
timeouts.put(sequenceNumber, timeout);
sendUnitData(command).whenComplete((v, ex) -> {
// sendUnitData() fails fast if the channel isn't available
if (ex != null) future.completeExceptionally(ex);
});
return future;
}
public CompletableFuture sendUnconnectedData(ByteBuf data) {
return sendUnconnectedData((buffer) -> buffer.writeBytes(data));
}
public CompletableFuture sendUnconnectedData(Consumer dataEncoder) {
CompletableFuture future = new CompletableFuture<>();
UnconnectedDataItemRequest dataItem = new UnconnectedDataItemRequest(dataEncoder);
CpfPacket packet = new CpfPacket(new NullAddressItem(), dataItem);
sendRRData(new SendRRData(packet)).whenComplete((command, ex) -> {
if (command != null) {
CpfItem[] items = command.getPacket().getItems();
if (items.length == 2 &&
items[0].getTypeId() == NullAddressItem.TYPE_ID &&
items[1].getTypeId() == UnconnectedDataItemResponse.TYPE_ID) {
ByteBuf data = ((UnconnectedDataItemResponse) items[1]).getData();
future.complete(data);
} else {
future.completeExceptionally(new Exception("received unexpected items"));
}
} else {
future.completeExceptionally(ex);
}
});
return future;
}
@Override
protected void onUnitDataReceived(SendUnitData command) {
CpfItem[] items = command.getPacket().getItems();
if (connectedDataHandler.itemsMatch(items)) {
connectedDataHandler.itemsReceived(items);
} else {
for (CpfItemHandler handler : additionalHandlers) {
if (handler.itemsMatch(items)) {
handler.itemsReceived(items);
break;
}
}
}
}
private short nextSequenceNumber() {
return (short) sequenceNumber.incrementAndGet();
}
private class ConnectedDataHandler implements CpfItemHandler {
@Override
public void itemsReceived(CpfItem[] items) {
int connectionId = ((ConnectedAddressItem) items[0]).getConnectionId();
ByteBuf buffer = ((ConnectedDataItemResponse) items[1]).getData();
int sequenceNumber = buffer.readShort();
ByteBuf data = buffer.readSlice(buffer.readableBytes()).retain();
Timeout timeout = timeouts.remove(sequenceNumber);
if (timeout != null) timeout.cancel();
CompletableFuture future = pending.remove(sequenceNumber);
if (future != null) {
future.complete(data);
} else {
ReferenceCountUtil.release(data);
}
ReferenceCountUtil.release(buffer);
}
@Override
public boolean itemsMatch(CpfItem[] items) {
return items.length == 2 &&
items[0].getTypeId() == ConnectedAddressItem.TYPE_ID &&
items[1].getTypeId() == ConnectedDataItemResponse.TYPE_ID;
}
}
public static interface CpfItemHandler {
boolean itemsMatch(CpfItem[] items);
void itemsReceived(CpfItem[] items);
}
}
