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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.hosted.provision.restapi.v2;
import com.yahoo.component.Version;
import com.yahoo.config.provision.DockerImage;
import com.yahoo.config.provision.NodeFlavors;
import com.yahoo.io.IOUtils;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Type;
import com.yahoo.vespa.config.SlimeUtils;
import com.yahoo.vespa.hosted.provision.Node;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.node.Allocation;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import java.util.TreeSet;
import java.util.stream.Collectors;
/**
* A class which can take a partial JSON node/v2 node JSON structure and apply it to a node object.
* This is a one-time use object.
*
* @author bratseth
*/
public class NodePatcher {
private static final String HARDWARE_FAILURE_DESCRIPTION = "hardwareFailureDescription";
private static final String WANT_TO_RETIRE = "wantToRetire";
private static final String WANT_TO_DEPROVISION = "wantToDeprovision";
private final NodeFlavors nodeFlavors;
private final Inspector inspector;
private final NodeRepository nodeRepository;
private Node node;
private List<Node> children;
private boolean childrenModified = false;
public NodePatcher(NodeFlavors nodeFlavors, InputStream json, Node node, NodeRepository nodeRepository) {
try {
this.nodeFlavors = nodeFlavors;
inspector = SlimeUtils.jsonToSlime(IOUtils.readBytes(json, 1000 * 1000)).get();
this.node = node;
this.nodeRepository = nodeRepository;
this.children = node.type().isDockerHost() ?
nodeRepository.getChildNodes(node.hostname()) :
Collections.emptyList();
}
catch (IOException e) {
throw new RuntimeException("Error reading request body", e);
}
}
/**
* Apply the json to the node and return all nodes affected by the patch.
* More than 1 node may be affected if e.g. the node is a Docker host, which may have
* children that must be updated in a consistent manner.
*/
public List<Node> apply() {
inspector.traverse((String name, Inspector value) -> {
try {
node = applyField(node, name, value);
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Could not set field '" + name + "'", e);
}
try {
children = applyFieldRecursive(children, name, value);
childrenModified = true;
} catch (IllegalArgumentException e) {
// Non recursive field, ignore
}
} );
List<Node> nodes = childrenModified ? new ArrayList<>(children) : new ArrayList<>();
nodes.add(node);
return nodes;
}
private List<Node> applyFieldRecursive(List<Node> childNodes, String name, Inspector value) {
switch (name) {
case HARDWARE_FAILURE_DESCRIPTION:
case WANT_TO_RETIRE:
case WANT_TO_DEPROVISION:
return childNodes.stream()
.map(child -> applyField(child, name, value))
.collect(Collectors.toList());
default :
throw new IllegalArgumentException("Field " + name + " is not recursive");
}
}
private Node applyField(Node node, String name, Inspector value) {
switch (name) {
case "currentRebootGeneration" :
return node.withCurrentRebootGeneration(asLong(value), nodeRepository.clock().instant());
case "currentRestartGeneration" :
return patchCurrentRestartGeneration(asLong(value));
case "currentDockerImage" :
Version versionFromImage = Optional.of(asString(value))
.filter(s -> !s.isEmpty())
.map(DockerImage::new)
.map(DockerImage::tagAsVersion)
.orElse(Version.emptyVersion);
return node.with(node.status().withVespaVersion(versionFromImage));
case "vespaVersion" :
case "currentVespaVersion" :
return node.with(node.status().withVespaVersion(Version.fromString(asString(value))));
case "failCount" :
return node.with(node.status().setFailCount(asLong(value).intValue()));
case "flavor" :
return node.with(nodeFlavors.getFlavorOrThrow(asString(value)));
case HARDWARE_FAILURE_DESCRIPTION:
return node.with(node.status().withHardwareFailureDescription(removeQuotedNulls(asOptionalString(value))));
case "parentHostname" :
return node.withParentHostname(asString(value));
case "ipAddresses" :
return node.withIpAddresses(asStringSet(value));
case "additionalIpAddresses" :
return node.withAdditionalIpAddresses(asStringSet(value));
case WANT_TO_RETIRE :
return node.with(node.status().withWantToRetire(asBoolean(value)));
case WANT_TO_DEPROVISION :
return node.with(node.status().withWantToDeprovision(asBoolean(value)));
case "hardwareDivergence" :
return node.with(node.status().withHardwareDivergence(removeQuotedNulls(asOptionalString(value))));
case "openStackId" :
return node.withOpenStackId(asString(value));
default :
throw new IllegalArgumentException("Could not apply field '" + name + "' on a node: No such modifiable field");
}
}
private Set<String> asStringSet(Inspector field) {
if ( ! field.type().equals(Type.ARRAY))
throw new IllegalArgumentException("Expected an ARRAY value, got a " + field.type());
TreeSet<String> strings = new TreeSet<>();
for (int i = 0; i < field.entries(); i++) {
Inspector entry = field.entry(i);
if ( ! entry.type().equals(Type.STRING))
throw new IllegalArgumentException("Expected a STRING value, got a " + entry.type());
strings.add(entry.asString());
}
return strings;
}
private Node patchCurrentRestartGeneration(Long value) {
Optional<Allocation> allocation = node.allocation();
if (allocation.isPresent())
return node.with(allocation.get().withRestart(allocation.get().restartGeneration().withCurrent(value)));
else
throw new IllegalArgumentException("Node is not allocated");
}
private Long asLong(Inspector field) {
if ( ! field.type().equals(Type.LONG))
throw new IllegalArgumentException("Expected a LONG value, got a " + field.type());
return field.asLong();
}
private String asString(Inspector field) {
if ( ! field.type().equals(Type.STRING))
throw new IllegalArgumentException("Expected a STRING value, got a " + field.type());
return field.asString();
}
private Optional<String> asOptionalString(Inspector field) {
return field.type().equals(Type.NIX) ? Optional.empty() : Optional.of(asString(field));
}
// Allows us to clear optional flags by passing "null" as slime does not have an empty (but present) representation
private Optional<String> removeQuotedNulls(Optional<String> value) {
return value.filter(v -> !v.equals("null"));
}
private boolean asBoolean(Inspector field) {
if ( ! field.type().equals(Type.BOOL))
throw new IllegalArgumentException("Expected a BOOL value, got a " + field.type());
return field.asBool();
}
}
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