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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.core.rpc;
import com.yahoo.jrt.Acceptor;
import com.yahoo.jrt.ErrorCode;
import com.yahoo.jrt.ListenFailedException;
import com.yahoo.jrt.Method;
import com.yahoo.jrt.Request;
import com.yahoo.jrt.Spec;
import com.yahoo.jrt.StringValue;
import com.yahoo.jrt.Supervisor;
import com.yahoo.jrt.Transport;
import com.yahoo.jrt.slobrok.api.Register;
import com.yahoo.jrt.slobrok.api.SlobrokList;
import com.yahoo.net.HostName;
import com.yahoo.vdslib.state.ClusterState;
import com.yahoo.vdslib.state.Node;
import com.yahoo.vdslib.state.NodeState;
import com.yahoo.vdslib.state.NodeType;
import com.yahoo.vdslib.state.State;
import com.yahoo.vespa.clustercontroller.core.ContentCluster;
import com.yahoo.vespa.clustercontroller.core.MasterElectionHandler;
import com.yahoo.vespa.clustercontroller.core.NodeInfo;
import com.yahoo.vespa.clustercontroller.core.listeners.NodeListener;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
// TODO: RpcServer is only used in unit tests, should be removed
public class RpcServer {
private static final Logger log = Logger.getLogger(RpcServer.class.getName());
private final Object monitor;
private final String clusterName;
private final int fleetControllerIndex;
private String[] slobrokConnectionSpecs;
private int port = 0;
private Supervisor supervisor;
private Acceptor acceptor;
private Register register;
private final List<Request> rpcRequests = new LinkedList<>();
private MasterElectionHandler masterHandler;
public RpcServer(Object monitor, String clusterName, int fleetControllerIndex) {
this.monitor = monitor;
this.clusterName = clusterName;
this.fleetControllerIndex = fleetControllerIndex;
}
public void setMasterElectionHandler(MasterElectionHandler handler) { this.masterHandler = handler; }
public int getPort() {
if (acceptor == null) return -1;
return acceptor.port();
}
public void shutdown() {
disconnect();
}
public String getSlobrokName() {
return "storage/cluster." + clusterName + "/fleetcontroller/" + fleetControllerIndex;
}
public void setSlobrokConnectionSpecs(String[] slobrokConnectionSpecs, int port) {
if (this.slobrokConnectionSpecs == null
|| !Arrays.equals(this.slobrokConnectionSpecs, slobrokConnectionSpecs)
|| this.port != port) {
this.slobrokConnectionSpecs = slobrokConnectionSpecs;
this.port = port;
disconnect();
connect();
}
}
public boolean isConnected() {
return (register != null);
}
public void connect() {
disconnect();
supervisor = new Supervisor(new Transport("rpc" + port)).setDropEmptyBuffers(true);
addMethods();
log.log(Level.FINE, () -> "Fleetcontroller " + fleetControllerIndex + ": RPC server attempting to bind to port " + port);
try {
acceptor = supervisor.listen(new Spec(port));
} catch (ListenFailedException e) {
throw new RuntimeException(e);
}
log.log(Level.FINE, () -> "Fleetcontroller " + fleetControllerIndex + ": RPC server listening to port " + acceptor.port());
SlobrokList slist = new SlobrokList();
slist.setup(slobrokConnectionSpecs);
Spec spec = new Spec(HostName.getLocalhost(), acceptor.port());
log.log(Level.INFO, "Registering " + spec + " with slobrok at " + String.join(" ", slobrokConnectionSpecs));
register = new Register(supervisor, slist, spec);
register.registerName(getSlobrokName());
}
public void disconnect() {
if (register != null) {
log.log(Level.FINE, () -> "Fleetcontroller " + fleetControllerIndex + ": Disconnecting RPC server.");
register.shutdown();
register = null;
}
if (acceptor != null) {
acceptor.shutdown().join();
acceptor = null;
}
if (supervisor != null) {
supervisor.transport().shutdown().join();
supervisor = null;
}
}
public void addMethods() {
Method m = new Method("getSystemState", "", "ss", this::queueRpcRequest);
m.methodDesc("Get nodeState of all nodes and the system itself");
m.returnDesc(0, "systemstate", "nodeState string of system");
m.returnDesc(1, "nodestate", "nodeState-string for distributor and storage-nodes");
supervisor.addMethod(m);
m = new Method("getNodeState", "si", "ssss", this::queueRpcRequest);
m.methodDesc("Get nodeState of a node");
m.paramDesc(0, "nodeType", "Type of node. Should be 'storage' or 'distributor'");
m.paramDesc(1, "nodeIndex", "The node index");
m.returnDesc(0, "systemState", "This nodes state in the current system state");
m.returnDesc(1, "nodeState", "This nodes state as it reports itself. (Or down if we can't reach it)");
m.returnDesc(2, "wantedState", "This nodes wanted state");
m.returnDesc(3, "rpcAddress", "This nodes RPC server address");
supervisor.addMethod(m);
m = new Method("setNodeState", "ss", "s", this::queueRpcRequest);
m.methodDesc("Set nodeState of a node");
m.paramDesc(0, "slobrokAddress", "Slobrok address of node");
m.paramDesc(1, "nodeState", "Desired nodeState of the node (complete nodeState string - [key:value ]*)");
m.returnDesc(0, "status", "success/failure");
supervisor.addMethod(m);
}
// Called by rpc
private void queueRpcRequest(Request req) {
synchronized(monitor) {
req.detach();
rpcRequests.add(req);
monitor.notifyAll();
}
}
public boolean handleRpcRequests(ContentCluster cluster, ClusterState systemState, NodeListener changeListener) {
if (!isConnected())
connect();
boolean handledAnyRequests = false;
for (int j=0; j<10; ++j) { // Max perform 10 RPC requests per cycle.
Request req;
synchronized(monitor) {
if (rpcRequests.isEmpty()) break;
Iterator<Request> it = rpcRequests.iterator();
req = it.next();
it.remove();
handledAnyRequests = true;
}
try{
if (!masterHandler.isMaster()) {
throw new IllegalStateException("Refusing to answer RPC calls as we are not the master fleetcontroller.");
}
if (req.methodName().equals("getSystemState")) {
log.log(Level.FINE, "Resolving RPC getSystemState request");
req.returnValues().add(new StringValue(""));
req.returnValues().add(new StringValue(systemState.toString(true)));
req.returnRequest();
} else if (req.methodName().equals("getNodeState")) {
log.log(Level.FINE, "Resolving RPC getNodeState request");
NodeType nodeType = NodeType.get(req.parameters().get(0).asString());
int nodeIndex = req.parameters().get(1).asInt32();
Node node = new Node(nodeType, nodeIndex);
req.returnValues().add(new StringValue(systemState.getNodeState(node).serialize()));
// Second parameter is state node is reporting
NodeInfo nodeInfo = cluster.getNodeInfo(node);
if (nodeInfo == null) throw new RuntimeException("No node " + node + " exists in cluster " + cluster.getName());
NodeState fromNode = nodeInfo.getReportedState();
req.returnValues().add(new StringValue(fromNode == null ? "unknown" : fromNode.serialize()));
// Third parameter is state node has been requested to be in
req.returnValues().add(new StringValue(nodeInfo.getWantedState().serialize()));
// Fourth parameter is RPC address of node
req.returnValues().add(new StringValue(nodeInfo.getRpcAddress() == null ? "" : nodeInfo.getRpcAddress()));
req.returnRequest();
} else if (req.methodName().equals("setNodeState")) {
String slobrokAddress = req.parameters().get(0).asString();
int lastSlash = slobrokAddress.lastIndexOf('/');
int nextButLastSlash = slobrokAddress.lastIndexOf('/', lastSlash - 1);
if (lastSlash == -1 || nextButLastSlash == -1) {
throw new IllegalStateException("Invalid slobrok address '" + slobrokAddress + "'.");
}
NodeType nodeType = NodeType.get(slobrokAddress.substring(nextButLastSlash + 1, lastSlash));
int nodeIndex = Integer.parseInt(slobrokAddress.substring(lastSlash + 1));
NodeInfo node = cluster.getNodeInfo(new Node(nodeType, nodeIndex));
if (node == null)
throw new IllegalStateException("Cannot set wanted state of node " + new Node(nodeType, nodeIndex) + ". Index does not correspond to a configured node.");
NodeState nodeState = NodeState.deserialize(nodeType, req.parameters().get(1).asString());
if (nodeState.getDescription().equals("") && !nodeState.getState().equals(State.UP) && !nodeState.getState().equals(State.RETIRED)) {
nodeState.setDescription("Set by remote RPC client");
}
NodeState oldState = node.getUserWantedState();
String message = (nodeState.getState().equals(State.UP)
? "Clearing wanted nodeState for node " + node
: "New wantedstate '" + nodeState + "' stored for node " + node);
if (!oldState.equals(nodeState) || !oldState.getDescription().equals(nodeState.getDescription())) {
if (!nodeState.getState().validWantedNodeState(nodeType)) {
throw new IllegalStateException("State " + nodeState.getState()
+ " can not be used as wanted state for node of type " + nodeType);
}
node.setWantedState(nodeState);
changeListener.handleNewWantedNodeState(node, nodeState);
} else {
message = "Node " + node + " already had wanted state " + nodeState;
log.log(Level.FINE, message);
}
req.returnValues().add(new StringValue(message));
req.returnRequest();
if (nodeState.getState() == State.UP && node.getPrematureCrashCount() > 0) {
log.log(Level.INFO, "Clearing premature crash count of " + node.getPrematureCrashCount() + " as wanted state was set to up");
node.setPrematureCrashCount(0);
}
}
} catch (Exception e) {
if (log.isLoggable(Level.FINE)) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
log.log(Level.FINE, "Failed RPC Request: " + sw);
}
String errorMsg = e.getMessage();
if (errorMsg == null) { errorMsg = e.toString(); }
req.setError(ErrorCode.METHOD_FAILED, errorMsg);
req.returnRequest();
}
}
return handledAnyRequests;
}
}
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