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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.hosted.provision.restapi;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.JsonFormat;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.maintenance.CapacityChecker;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
/**
* @author mgimle
*/
public class HostCapacityResponse extends HttpResponse {
private final StringBuilder text;
private final Slime slime;
private final CapacityChecker capacityChecker;
private final boolean json;
public HostCapacityResponse(NodeRepository nodeRepository, HttpRequest request) {
super(200);
capacityChecker = new CapacityChecker(nodeRepository.nodes().list());
json = request.getBooleanProperty("json");
String hostsJson = request.getProperty("hosts");
text = new StringBuilder();
slime = new Slime();
Cursor root = slime.setObject();
if (hostsJson != null) {
List<Node> hosts = parseHostList(hostsJson);
hostRemovalResponse(root, hosts);
} else {
zoneFailureReponse(root);
}
}
private List<Node> parseHostList(String hosts) {
List<String> hostNames = Arrays.asList(hosts.split(","));
try {
return capacityChecker.nodesFromHostnames(hostNames);
} catch (IllegalArgumentException e) {
throw new NotFoundException(e.getMessage());
}
}
private void hostRemovalResponse(Cursor root, List<Node> hosts) {
var failure = capacityChecker.findHostRemovalFailure(hosts);
if (failure.isPresent() && failure.get().failureReason.allocationFailures.size() == 0) {
root.setBool("removalPossible", false);
error(root, "Removing all hosts is trivially impossible.");
} else {
if (json) hostLossPossibleToSlime(root, failure, hosts);
else hostLossPossibleToText(failure, hosts);
}
}
private void zoneFailureReponse(Cursor root) {
var failurePath = capacityChecker.worstCaseHostLossLeadingToFailure();
if (failurePath.isPresent()) {
if (json) zoneFailurePathToSlime(root, failurePath.get());
else zoneFailurePathToText(failurePath.get());
} else {
error(root, "Node repository contained no hosts.");
}
}
private void error(Cursor root, String errorMessage) {
if (json) root.setString("error", errorMessage);
else text.append(errorMessage);
}
private void hostLossPossibleToText(Optional<CapacityChecker.HostFailurePath> failure, List<Node> hostsToRemove) {
text.append(String.format("Attempting to remove %d hosts: ", hostsToRemove.size()));
CapacityChecker.AllocationHistory history = capacityChecker.allocationHistory;
if (failure.isEmpty()) {
text.append("OK\n\n");
text.append(history);
if (history.oldParents().size() != hostsToRemove.size()) {
long emptyHostCount = hostsToRemove.size() - history.oldParents().size();
text.append(String.format("\nTrivially removed %d empty host%s.", emptyHostCount, emptyHostCount > 1 ? "s" : ""));
}
} else {
text.append("FAILURE\n\n");
text.append(history).append("\n");
text.append(failure.get().failureReason).append("\n\n");
}
}
private void zoneFailurePathToText(CapacityChecker.HostFailurePath failurePath) {
text.append(String.format("Found %d hosts. Failure upon trying to remove %d hosts:\n\n",
capacityChecker.getHosts().size(),
failurePath.hostsCausingFailure.size()));
text.append(capacityChecker.allocationHistory).append("\n");
text.append(failurePath.failureReason);
}
private void hostLossPossibleToSlime(Cursor root, Optional<CapacityChecker.HostFailurePath> failure, List<Node> hostsToRemove) {
var hosts = root.setArray("hostsToRemove");
hostsToRemove.forEach(h -> hosts.addString(h.hostname()));
CapacityChecker.AllocationHistory history = capacityChecker.allocationHistory;
root.setBool("removalPossible", failure.isEmpty());
var arr = root.setArray("history");
for (var entry : history.historyEntries) {
var object = arr.addObject();
object.setString("tenant", entry.tenant.hostname());
if (entry.newParent != null) {
object.setString("newParent", entry.newParent.hostname());
}
object.setLong("eligibleParents", entry.eligibleParents);
}
}
private void zoneFailurePathToSlime(Cursor object, CapacityChecker.HostFailurePath failurePath) {
object.setLong("totalHosts", capacityChecker.getHosts().size());
object.setLong("couldLoseHosts", failurePath.hostsCausingFailure.size());
failurePath.failureReason.host.ifPresent(host ->
object.setString("failedTenantParent", host.hostname())
);
failurePath.failureReason.tenant.ifPresent(tenant -> {
object.setString("failedTenant", tenant.hostname());
object.setString("failedTenantResources", tenant.resources().toString());
tenant.allocation().ifPresent(allocation ->
object.setString("failedTenantAllocation", allocation.toString())
);
var explanation = object.setObject("hostCandidateRejectionReasons");
allocationFailureReasonListToSlime(explanation.setObject("singularReasonFailures"),
failurePath.failureReason.allocationFailures.singularReasonFailures());
allocationFailureReasonListToSlime(explanation.setObject("totalFailures"),
failurePath.failureReason.allocationFailures);
});
var details = object.setObject("details");
hostLossPossibleToSlime(details, Optional.of(failurePath), failurePath.hostsCausingFailure);
}
private void allocationFailureReasonListToSlime(Cursor root, CapacityChecker.AllocationFailureReasonList allocationFailureReasonList) {
root.setLong("insufficientVcpu", allocationFailureReasonList.insufficientVcpu());
root.setLong("insufficientMemoryGb", allocationFailureReasonList.insufficientMemoryGb());
root.setLong("insufficientDiskGb", allocationFailureReasonList.insufficientDiskGb());
root.setLong("incompatibleDiskSpeed", allocationFailureReasonList.incompatibleDiskSpeed());
root.setLong("insufficientAvailableIps", allocationFailureReasonList.insufficientAvailableIps());
root.setLong("violatesParentHostPolicy", allocationFailureReasonList.violatesParentHostPolicy());
}
@Override
public void render(OutputStream stream) throws IOException {
if (json) new JsonFormat(true).encode(stream, slime);
else stream.write(text.toString().getBytes());
}
@Override
public String getContentType() {
return json ? "application/json" : "text/plain";
}
}
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