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/*
* Copyright 2016-17, OpenCensus Authors
*
* 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 io.opencensus.implcore.tags.propagation;
import static com.google.common.truth.Truth.assertThat;
import com.google.common.base.Charsets;
import com.google.common.collect.Collections2;
import io.opencensus.implcore.internal.VarInt;
import io.opencensus.implcore.tags.TagsComponentImplBase;
import io.opencensus.tags.Tag;
import io.opencensus.tags.TagContext;
import io.opencensus.tags.TagContextBuilder;
import io.opencensus.tags.TagKey;
import io.opencensus.tags.TagValue;
import io.opencensus.tags.Tagger;
import io.opencensus.tags.TagsComponent;
import io.opencensus.tags.propagation.TagContextBinarySerializer;
import io.opencensus.tags.propagation.TagContextSerializationException;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
/**
* Tests for serializing tags with {@link SerializationUtils} and {@link
* TagContextBinarySerializerImpl}.
*/
@RunWith(JUnit4.class)
public class TagContextSerializationTest {
@Rule public final ExpectedException thrown = ExpectedException.none();
private static final TagKey K1 = TagKey.create("k1");
private static final TagKey K2 = TagKey.create("k2");
private static final TagKey K3 = TagKey.create("k3");
private static final TagKey K4 = TagKey.create("k4");
private static final TagValue V1 = TagValue.create("v1");
private static final TagValue V2 = TagValue.create("v2");
private static final TagValue V3 = TagValue.create("v3");
private static final TagValue V4 = TagValue.create("v4");
private static final Tag T1 = Tag.create(K1, V1);
private static final Tag T2 = Tag.create(K2, V2);
private static final Tag T3 = Tag.create(K3, V3);
private static final Tag T4 = Tag.create(K4, V4);
private final TagsComponent tagsComponent = new TagsComponentImplBase();
private final TagContextBinarySerializer serializer =
tagsComponent.getTagPropagationComponent().getBinarySerializer();
private final Tagger tagger = tagsComponent.getTagger();
@Test
public void testSerializeDefault() throws Exception {
testSerialize();
}
@Test
public void testSerializeWithOneTag() throws Exception {
testSerialize(T1);
}
@Test
public void testSerializeWithMultipleTags() throws Exception {
testSerialize(T1, T2, T3, T4);
}
@Test
public void testSerializeTooLargeTagContext() throws TagContextSerializationException {
TagContextBuilder builder = tagger.emptyBuilder();
for (int i = 0; i < SerializationUtils.TAGCONTEXT_SERIALIZED_SIZE_LIMIT / 8 - 1; i++) {
// Each tag will be with format {key : "0123", value : "0123"}, so the length of it is 8.
String str;
if (i < 10) {
str = "000" + i;
} else if (i < 100) {
str = "00" + i;
} else if (i < 1000) {
str = "0" + i;
} else {
str = String.valueOf(i);
}
builder.put(TagKey.create(str), TagValue.create(str));
}
// The last tag will be of size 9, so the total size of the TagContext (8193) will be one byte
// more than limit.
builder.put(TagKey.create("last"), TagValue.create("last1"));
TagContext tagContext = builder.build();
thrown.expect(TagContextSerializationException.class);
thrown.expectMessage("Size of TagContext exceeds the maximum serialized size ");
serializer.toByteArray(tagContext);
}
private void testSerialize(Tag... tags) throws IOException, TagContextSerializationException {
TagContextBuilder builder = tagger.emptyBuilder();
for (Tag tag : tags) {
builder.put(tag.getKey(), tag.getValue());
}
byte[] actual = serializer.toByteArray(builder.build());
Collection<List<Tag>> tagPermutation = Collections2.permutations(Arrays.asList(tags));
Set<String> possibleOutputs = new HashSet<String>();
for (List<Tag> list : tagPermutation) {
ByteArrayOutputStream expected = new ByteArrayOutputStream();
expected.write(SerializationUtils.VERSION_ID);
for (Tag tag : list) {
expected.write(SerializationUtils.TAG_FIELD_ID);
encodeString(tag.getKey().getName(), expected);
encodeString(tag.getValue().asString(), expected);
}
possibleOutputs.add(new String(expected.toByteArray(), Charsets.UTF_8));
}
assertThat(possibleOutputs).contains(new String(actual, Charsets.UTF_8));
}
private static void encodeString(String input, ByteArrayOutputStream byteArrayOutputStream)
throws IOException {
VarInt.putVarInt(input.length(), byteArrayOutputStream);
byteArrayOutputStream.write(input.getBytes(Charsets.UTF_8));
}
}
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