| /* |
| * Copyright 2023-present Open Networking Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onosproject.netflow.impl; |
| |
| import java.nio.ByteBuffer; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.Optional; |
| import java.util.function.Function; |
| import java.util.function.Predicate; |
| import java.util.stream.Collectors; |
| import java.util.stream.IntStream; |
| |
| import com.google.common.base.MoreObjects; |
| |
| import org.onlab.packet.Deserializer; |
| import org.onosproject.netflow.TemplateId; |
| import org.onosproject.netflow.FlowTemplateField; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static com.google.common.base.Preconditions.checkState; |
| |
| /** |
| * Template Record defines the structure and interpretation. |
| * of fields in an Options Data Record, including defining the scope |
| * within which the Options Data Record is relevant. |
| * Ref: https://www.ietf.org/rfc/rfc3954.txt |
| */ |
| public final class DataTemplateRecord extends TemplateRecord { |
| |
| /* |
| 0 1 2 3 |
| 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Template ID 256 | Field Count | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Field Type 1 | Field Length 1 | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Field Type 2 | Field Length 2 | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| */ |
| |
| private TemplateId templateId; |
| |
| private int filedCount; |
| |
| private List<FlowTemplateField> fields; |
| |
| private DataTemplateRecord(Builder builder) { |
| this.templateId = builder.templateId; |
| this.filedCount = builder.filedCount; |
| this.fields = builder.fields; |
| } |
| |
| /** |
| * Returns template record's template id. |
| * Template Records is given a unique Template ID. |
| * This uniqueness is local to the Observation |
| * Domain that generated the Template ID. Template IDs 0-255 are |
| * reserved for Template FlowSets, Options FlowSets, and other |
| * reserved FlowSets yet to be created. |
| * |
| * @return list of flowsets |
| */ |
| @Override |
| public TemplateId getTemplateId() { |
| return templateId; |
| } |
| |
| /** |
| * Returns number of fields in this Template Record. |
| * |
| * @return field count |
| */ |
| public int getFiledCount() { |
| return filedCount; |
| } |
| |
| /** |
| * Returns list of flow template fields. |
| * |
| * @return list of flow template fields |
| */ |
| public List<FlowTemplateField> getFields() { |
| return fields; |
| } |
| |
| public int getValueLength() { |
| Optional.ofNullable(fields) |
| .orElseThrow(() -> new IllegalStateException("Invalid fields")); |
| return fields.stream() |
| .filter(Objects::nonNull) |
| .map(FlowTemplateField::getLength) |
| .collect(Collectors.summingInt(Integer::intValue)); |
| } |
| |
| @Override |
| public String toString() { |
| return MoreObjects.toStringHelper(getClass()) |
| .add("templateId", templateId) |
| .add("filedCount", filedCount) |
| .add("fields", fields) |
| .toString(); |
| } |
| |
| /** |
| * Data deserializer function for data template record. |
| * |
| * @return data deserializer function |
| */ |
| public static Deserializer<DataTemplateRecord> deserializer() { |
| return (data, offset, length) -> { |
| Predicate<ByteBuffer> isValidBuffer = b -> b.remaining() < FlowSet.FIELD_LENTH; |
| Function<ByteBuffer, FlowTemplateField> parse = (b) |
| -> { |
| if (isValidBuffer.test(b)) { |
| throw new IllegalStateException("Invalid buffersize"); |
| } |
| return new FlowTemplateField.Builder() |
| .flowField(b.getShort()) |
| .length(b.getShort()) |
| .build(); |
| }; |
| |
| Builder builder = new Builder(); |
| ByteBuffer bb = ByteBuffer.wrap(data, offset, length); |
| if (isValidBuffer.test(bb)) { |
| throw new IllegalStateException("Invalid buffersize"); |
| } |
| builder.templateId(bb.getShort()) |
| .filedCount(bb.getShort()); |
| IntStream.rangeClosed(1, builder.filedCount).forEach(i -> builder.templateField(parse.apply(bb))); |
| return builder.build(); |
| }; |
| } |
| |
| /** |
| * Builder for data template record. |
| */ |
| private static class Builder { |
| |
| private TemplateId templateId; |
| |
| private int filedCount; |
| |
| private List<FlowTemplateField> fields = new LinkedList<>(); |
| |
| /** |
| * Setter for template record's template id. |
| * |
| * @param templateId template record's template id. |
| * @return this class builder. |
| */ |
| public Builder templateId(int templateId) { |
| this.templateId = new TemplateId((templateId)); |
| return this; |
| } |
| |
| /** |
| * Setter for number of fields in this Template Record. |
| * |
| * @param filedCount number of fields in this Template Record. |
| * @return this class builder. |
| */ |
| public Builder filedCount(int filedCount) { |
| this.filedCount = filedCount; |
| return this; |
| } |
| |
| /** |
| * Setter for list of flow template fields. |
| * |
| * @param fields list of flow template fields. |
| * @return this class builder. |
| */ |
| public Builder templateFields(List<FlowTemplateField> fields) { |
| this.fields = fields; |
| return this; |
| } |
| |
| /** |
| * Setter for flow template fields. |
| * |
| * @param field flow template fields. |
| * @return this class builder. |
| */ |
| public Builder templateField(FlowTemplateField field) { |
| this.fields.add(field); |
| return this; |
| } |
| |
| /** |
| * Checks arguments for data template record. |
| */ |
| private void checkArguments() { |
| checkState(filedCount != 0, "Invalid template filed count."); |
| checkNotNull(templateId, "Template Id cannot be null."); |
| |
| } |
| |
| /** |
| * Builds data template record. |
| * |
| * @return data template record. |
| */ |
| public DataTemplateRecord build() { |
| checkArguments(); |
| return new DataTemplateRecord(this); |
| } |
| |
| } |
| |
| } |