Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Refactor Metadata.toXContent by extracting methods #124689

Merged
merged 2 commits into from
Mar 13, 2025
Merged

Refactor Metadata.toXContent by extracting methods #124689

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
5cf3c12
Refactor Metadata.toXContent by extracting methods
ywangd Mar 13, 2025
cd5ab61
Merge branch 'main' into extract-methods-for-metadata-toxcontent
elasticmachine Mar 13, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
167 changes: 92 additions & 75 deletions server/src/main/java/org/elasticsearch/cluster/metadata/Metadata.java
View file
Original file line number Diff line number Diff line change
@@ -683,11 +683,19 @@ public static Metadata fromXContent(XContentParser parser) throws IOException {

@Override
public Iterator<? extends ToXContent> toXContentChunked(ToXContent.Params p) {
XContentContext context = XContentContext.from(p);
final XContentContext context = XContentContext.from(p);
final Iterator<? extends ToXContent> start = context == XContentContext.API
? ChunkedToXContentHelper.startObject("metadata")
: Iterators.single((builder, params) -> builder.startObject("meta-data").field("version", version()));

final Iterator<? extends ToXContent> clusterCoordination = Iterators.single((builder, params) -> {
builder.field("cluster_uuid", clusterUUID);
builder.field("cluster_uuid_committed", clusterUUIDCommitted);
builder.startObject("cluster_coordination");
coordinationMetadata().toXContent(builder, params);
return builder.endObject();
});

final Iterator<? extends ToXContent> persistentSettings = context != XContentContext.API && persistentSettings().isEmpty() == false
? Iterators.single((builder, params) -> {
builder.startObject("settings");
@@ -696,89 +704,98 @@ public Iterator<? extends ToXContent> toXContentChunked(ToXContent.Params p) {
})
: Collections.emptyIterator();

// use a tree map so the order is deterministic
Map<String, ReservedStateMetadata> clusterReservedState = new TreeMap<>(reservedStateMetadata);

@FixForMultiProject
// Need to revisit whether this should be a param or something else.
final boolean multiProject = p.paramAsBoolean("multi-project", false);
if (multiProject) {
return Iterators.concat(start, Iterators.single((builder, params) -> {
builder.field("cluster_uuid", clusterUUID);
builder.field("cluster_uuid_committed", clusterUUIDCommitted);
builder.startObject("cluster_coordination");
coordinationMetadata().toXContent(builder, params);
return builder.endObject();
}),
persistentSettings,
ChunkedToXContentHelper.array(
"projects",
Iterators.flatMap(
projectMetadata.entrySet().iterator(),
e -> Iterators.concat(
ChunkedToXContentHelper.startObject(),
Iterators.single((builder, params) -> builder.field("id", e.getKey())),
e.getValue().toXContentChunked(p),
ChunkedToXContentHelper.endObject()
)
)
),
Iterators.flatMap(
customs.entrySet().iterator(),
entry -> entry.getValue().context().contains(context)
? ChunkedToXContentHelper.object(entry.getKey(), entry.getValue().toXContentChunked(p))
: Collections.emptyIterator()
),
ChunkedToXContentHelper.object("reserved_state", reservedStateMetadata().values().iterator()),
ChunkedToXContentHelper.endObject()
);
return toXContentChunkedWithMultiProjectFormat(p, context, start, clusterCoordination, persistentSettings);
} else {
if (projectMetadata.size() != 1) {
throw new MultiProjectPendingException("There are multiple projects " + projectMetadata.keySet());
}
// Need to rethink what to do here. This might be right, but maybe not...
@FixForMultiProject
final ProjectMetadata project = projectMetadata.values().iterator().next();

// need to combine reserved state together into a single block so we don't get duplicate keys
// and not include it in the project xcontent output (through the lack of multi-project params)
clusterReservedState.putAll(project.reservedStateMetadata());

// Similarly, combine cluster and project persistent tasks and report them under a single key
Iterator<ToXContent> customs = Iterators.flatMap(customs().entrySet().iterator(), entry -> {
if (entry.getValue().context().contains(context)
&& ClusterPersistentTasksCustomMetadata.TYPE.equals(entry.getKey()) == false) {
return ChunkedToXContentHelper.object(entry.getKey(), entry.getValue().toXContentChunked(p));
} else {
return Collections.emptyIterator();
}
});
final var combinedTasks = PersistentTasksCustomMetadata.combine(
ClusterPersistentTasksCustomMetadata.get(this),
PersistentTasksCustomMetadata.get(project)
);
if (combinedTasks != null) {
customs = Iterators.concat(
customs,
ChunkedToXContentHelper.object(PersistentTasksCustomMetadata.TYPE, combinedTasks.toXContentChunked(p))
);
}
return toXContentChunkedWithSingleProjectFormat(p, context, start, clusterCoordination, persistentSettings);
}
}

final var iterators = Iterators.concat(start, Iterators.single((builder, params) -> {
builder.field("cluster_uuid", clusterUUID);
builder.field("cluster_uuid_committed", clusterUUIDCommitted);
builder.startObject("cluster_coordination");
coordinationMetadata().toXContent(builder, params);
return builder.endObject();
}),
persistentSettings,
project.toXContentChunked(p),
private Iterator<? extends ToXContent> toXContentChunkedWithMultiProjectFormat(
ToXContent.Params p,
XContentContext context,
Iterator<? extends ToXContent> start,
Iterator<? extends ToXContent> clusterCoordination,
Iterator<? extends ToXContent> persistentSettings
) {
return Iterators.concat(
start,
clusterCoordination,
persistentSettings,
ChunkedToXContentHelper.array(
"projects",
Iterators.flatMap(
projectMetadata.entrySet().iterator(),
e -> Iterators.concat(
ChunkedToXContentHelper.startObject(),
Iterators.single((builder, params) -> builder.field("id", e.getKey())),
e.getValue().toXContentChunked(p),
ChunkedToXContentHelper.endObject()
)
)
),
Iterators.flatMap(
customs.entrySet().iterator(),
entry -> entry.getValue().context().contains(context)
? ChunkedToXContentHelper.object(entry.getKey(), entry.getValue().toXContentChunked(p))
: Collections.emptyIterator()
),
ChunkedToXContentHelper.object("reserved_state", reservedStateMetadata().values().iterator()),
ChunkedToXContentHelper.endObject()
);
}

private Iterator<? extends ToXContent> toXContentChunkedWithSingleProjectFormat(
ToXContent.Params p,
XContentContext context,
Iterator<? extends ToXContent> start,
Iterator<? extends ToXContent> clusterCoordination,
Iterator<? extends ToXContent> persistentSettings
) {
if (projectMetadata.size() != 1) {
throw new MultiProjectPendingException("There are multiple projects " + projectMetadata.keySet());
}
// Need to rethink what to do here. This might be right, but maybe not...
@FixForMultiProject
final ProjectMetadata project = projectMetadata.values().iterator().next();

// need to combine reserved state together into a single block so we don't get duplicate keys
// and not include it in the project xcontent output (through the lack of multi-project params)
// use a tree map so the order is deterministic
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

We don't need the tree map in the MP version?

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I actually have no idea. This is existing code. I thought the order was relied on tests. But I could not find any evidence.

final Map<String, ReservedStateMetadata> clusterReservedState = new TreeMap<>(reservedStateMetadata);
clusterReservedState.putAll(project.reservedStateMetadata());

// Similarly, combine cluster and project persistent tasks and report them under a single key
Iterator<ToXContent> customs = Iterators.flatMap(customs().entrySet().iterator(), entry -> {
if (entry.getValue().context().contains(context) && ClusterPersistentTasksCustomMetadata.TYPE.equals(entry.getKey()) == false) {
return ChunkedToXContentHelper.object(entry.getKey(), entry.getValue().toXContentChunked(p));
} else {
return Collections.emptyIterator();
}
});
final var combinedTasks = PersistentTasksCustomMetadata.combine(
ClusterPersistentTasksCustomMetadata.get(this),
PersistentTasksCustomMetadata.get(project)
);
if (combinedTasks != null) {
customs = Iterators.concat(
customs,
ChunkedToXContentHelper.object("reserved_state", clusterReservedState.values().iterator()),
ChunkedToXContentHelper.endObject()
ChunkedToXContentHelper.object(PersistentTasksCustomMetadata.TYPE, combinedTasks.toXContentChunked(p))
);
return iterators;
}

return Iterators.concat(
start,
clusterCoordination,
persistentSettings,
project.toXContentChunked(p),
customs,
ChunkedToXContentHelper.object("reserved_state", clusterReservedState.values().iterator()),
ChunkedToXContentHelper.endObject()
);
}

private static final DiffableUtils.KeySerializer<ProjectId> PROJECT_ID_SERIALIZER = DiffableUtils.getWriteableKeySerializer(