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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.rpc;
import com.yahoo.cloud.config.SentinelConfig;
import com.yahoo.collections.Pair;
import com.yahoo.config.provision.TenantName;
import com.yahoo.component.Version;
import com.yahoo.jrt.Request;
import java.util.logging.Level;
import com.yahoo.net.HostName;
import com.yahoo.vespa.config.ConfigPayload;
import com.yahoo.vespa.config.ErrorCode;
import com.yahoo.vespa.config.UnknownConfigIdException;
import com.yahoo.vespa.config.protocol.ConfigResponse;
import com.yahoo.vespa.config.protocol.JRTServerConfigRequest;
import com.yahoo.vespa.config.protocol.SlimeConfigResponse;
import com.yahoo.vespa.config.protocol.Trace;
import com.yahoo.vespa.config.protocol.VespaVersion;
import com.yahoo.vespa.config.server.GetConfigContext;
import com.yahoo.vespa.config.server.UnknownConfigDefinitionException;
import com.yahoo.vespa.config.server.tenant.TenantRepository;
import com.yahoo.vespa.config.util.ConfigUtils;
import java.util.Optional;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author hmusum
*/
class GetConfigProcessor implements Runnable {
private static final Logger log = Logger.getLogger(GetConfigProcessor.class.getName());
private static final String localHostName = HostName.getLocalhost();
private final JRTServerConfigRequest request;
/* True only when this request has expired its server timeout and we need to respond to the client */
private final boolean forceResponse;
private final RpcServer rpcServer;
private String logPre = "";
GetConfigProcessor(RpcServer rpcServer, JRTServerConfigRequest request, boolean forceResponse) {
this.rpcServer = rpcServer;
this.request = request;
this.forceResponse = forceResponse;
}
private void respond(JRTServerConfigRequest request) {
Request req = request.getRequest();
if (req.isError()) {
Level logLevel = (req.errorCode() == ErrorCode.APPLICATION_NOT_LOADED) ? LogLevel.DEBUG : LogLevel.INFO;
log.log(logLevel, logPre + req.errorMessage());
}
rpcServer.respond(request);
}
private void handleError(JRTServerConfigRequest request, int errorCode, String message) {
String target = "(unknown)";
try {
target = request.getRequest().target().toString();
} catch (IllegalStateException e) {
//ignore when no target
}
request.addErrorResponse(errorCode, logPre + "Failed request (" + message + ") from " + target);
respond(request);
}
// TODO: Increment statistics (Metrics) failed counters when requests fail
public Pair<GetConfigContext, Long> getConfig(JRTServerConfigRequest request) {
//Request has already been detached
if ( ! request.validateParameters()) {
// Error code is set in verifyParameters if parameters are not OK.
log.log(Level.WARNING, "Parameters for request " + request + " did not validate: " + request.errorCode() + " : " + request.errorMessage());
respond(request);
return null;
}
Trace trace = request.getRequestTrace();
if (logDebug(trace)) {
debugLog(trace, "GetConfigProcessor.run() on " + localHostName);
}
Optional<TenantName> tenant = rpcServer.resolveTenant(request, trace);
// If we are certain that this request is from a node that no longer belongs to this application,
// fabricate an empty request to cause the sentinel to stop all running services
if (rpcServer.canReturnEmptySentinelConfig() && rpcServer.allTenantsLoaded() && tenant.isEmpty() && isSentinelConfigRequest(request)) {
returnEmpty(request);
return null;
}
GetConfigContext context = rpcServer.createGetConfigContext(tenant, request, trace);
if (context == null || ! context.requestHandler().hasApplication(context.applicationId(), Optional.empty())) {
handleError(request, ErrorCode.APPLICATION_NOT_LOADED, "No application exists");
return null;
}
Optional<Version> vespaVersion = rpcServer.useRequestVersion() ?
request.getVespaVersion().map(VespaVersion::toString).map(Version::fromString) :
Optional.empty();
if (logDebug(trace)) {
debugLog(trace, "Using version " + getPrintableVespaVersion(vespaVersion));
}
if ( ! context.requestHandler().hasApplication(context.applicationId(), vespaVersion)) {
handleError(request, ErrorCode.UNKNOWN_VESPA_VERSION, "Unknown Vespa version in request: " + getPrintableVespaVersion(vespaVersion));
return null;
}
this.logPre = TenantRepository.logPre(context.applicationId());
ConfigResponse config;
try {
config = rpcServer.resolveConfig(request, context, vespaVersion);
} catch (UnknownConfigDefinitionException e) {
handleError(request, ErrorCode.UNKNOWN_DEFINITION, "Unknown config definition " + request.getConfigKey());
return null;
} catch (UnknownConfigIdException e) {
handleError(request, ErrorCode.ILLEGAL_CONFIGID, "Illegal config id " + request.getConfigKey().getConfigId());
return null;
} catch (Throwable e) {
log.log(Level.SEVERE, "Unexpected error handling config request", e);
handleError(request, ErrorCode.INTERNAL_ERROR, "Internal error " + e.getMessage());
return null;
}
// config == null is not an error, but indicates that the config will be returned later.
if ((config != null) && (!config.hasEqualConfig(request) || config.hasNewerGeneration(request) || forceResponse)) {
// debugLog(trace, "config response before encoding:" + config.toString());
request.addOkResponse(request.payloadFromResponse(config), config.getGeneration(), config.isInternalRedeploy(), config.getConfigMd5());
if (logDebug(trace)) {
debugLog(trace, "return response: " + request.getShortDescription());
}
respond(request);
} else {
if (logDebug(trace)) {
debugLog(trace, "delaying response " + request.getShortDescription());
}
return new Pair<>(context, config != null ? config.getGeneration() : 0);
}
return null;
}
@Override
public void run() {
rpcServer.hostLivenessTracker().receivedRequestFrom(request.getClientHostName());
Pair<GetConfigContext, Long> delayed = getConfig(request);
if (delayed != null) {
rpcServer.delayResponse(request, delayed.getFirst());
if (rpcServer.hasNewerGeneration(delayed.getFirst().applicationId(), delayed.getSecond())) {
// This will ensure that if the reload train left the station while I was boarding, another train will
// immediately be scheduled.
rpcServer.configReloaded(delayed.getFirst().applicationId());
}
}
}
private boolean isSentinelConfigRequest(JRTServerConfigRequest request) {
return request.getConfigKey().getName().equals(SentinelConfig.getDefName()) &&
request.getConfigKey().getNamespace().equals(SentinelConfig.getDefNamespace());
}
private static String getPrintableVespaVersion(Optional<Version> vespaVersion) {
return (vespaVersion.isPresent() ? vespaVersion.get().toFullString() : "LATEST");
}
private void returnEmpty(JRTServerConfigRequest request) {
log.log(Level.FINE, () -> "Returning empty sentinel config for request from " + request.getClientHostName());
ConfigPayload emptyPayload = ConfigPayload.empty();
String configMd5 = ConfigUtils.getMd5(emptyPayload);
ConfigResponse config = SlimeConfigResponse.fromConfigPayload(emptyPayload, 0, false, configMd5);
request.addOkResponse(request.payloadFromResponse(config), config.getGeneration(), false, config.getConfigMd5());
respond(request);
}
static boolean logDebug(Trace trace) {
return trace.shouldTrace(RpcServer.TRACELEVEL_DEBUG) || log.isLoggable(LogLevel.DEBUG);
}
private void debugLog(Trace trace, String message) {
if (logDebug(trace)) {
log.log(Level.FINE, logPre + message);
trace.trace(RpcServer.TRACELEVEL_DEBUG, logPre + message);
}
}
}
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