JsonCodecUnitTests.java

/*
 * Copyright 2019 the original author or 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
 *
 *      https://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.r2dbc.postgresql.codec;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.r2dbc.postgresql.client.EncodedParameter;
import io.r2dbc.postgresql.util.ByteBufUtils;
import org.junit.jupiter.api.Test;

import java.io.ByteArrayInputStream;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;

import static io.r2dbc.postgresql.client.EncodedParameter.NULL_VALUE;
import static io.r2dbc.postgresql.client.ParameterAssert.assertThat;
import static io.r2dbc.postgresql.codec.PostgresqlObjectId.JSON;
import static io.r2dbc.postgresql.codec.PostgresqlObjectId.JSONB;
import static io.r2dbc.postgresql.codec.PostgresqlObjectId.MONEY;
import static io.r2dbc.postgresql.message.Format.FORMAT_BINARY;
import static io.r2dbc.postgresql.message.Format.FORMAT_TEXT;
import static io.r2dbc.postgresql.util.TestByteBufAllocator.TEST;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
import static org.assertj.core.api.Assertions.assertThatIllegalStateException;

/**
 * Unit tests for {@link JsonCodec}.
 */
final class JsonCodecUnitTests {

    @Test
    void constructorNoByteBufAllocator() {
        assertThatIllegalArgumentException().isThrownBy(() -> new JsonCodec(null, true))
            .withMessage("byteBufAllocator must not be null");
    }

    @Test
    void decode() {
        String json = "{\"name\": \"John Doe\"}";
        JsonCodec jsonCodec = new JsonCodec(TEST, true);
        Json decodedBytes = jsonCodec.decode(ByteBufUtils.encode(TEST, json), JSON.getObjectId(), FORMAT_TEXT, Json.class);

        assertThat(decodedBytes.asString()).isEqualTo(json);
    }

    @Test
    void shouldDecodeWithAttachedBuffers() {
        String json = "{\"name\": \"John Doe\"}";
        JsonCodec jsonCodec = new JsonCodec(TEST, true);
        ByteBuf encoded = ByteBufUtils.encode(TEST, json);
        jsonCodec.decode(encoded, JSON.getObjectId(), FORMAT_TEXT, Json.class);

        assertThat(encoded.refCnt()).isEqualTo(2);
        encoded.release(2);
    }

    @Test
    void shouldDecodeWithDetachedBuffers() {
        String json = "{\"name\": \"John Doe\"}";
        JsonCodec jsonCodec = new JsonCodec(TEST, false);
        ByteBuf encoded = ByteBufUtils.encode(TEST, json);
        jsonCodec.decode(encoded, JSON.getObjectId(), FORMAT_TEXT, Json.class);

        assertThat(encoded.refCnt()).isEqualTo(1);
        encoded.release();
    }

    @Test
    void decodeNoByteBuf() {
        assertThat(new JsonCodec(TEST, true).decode(null, JSON.getObjectId(), FORMAT_TEXT, Json.class)).isNull();
    }

    @Test
    void doCanDecode() {
        JsonCodec jsonCodec = new JsonCodec(TEST, true);

        assertThat(jsonCodec.doCanDecode(JSON, FORMAT_TEXT)).isTrue();
        assertThat(jsonCodec.doCanDecode(JSON, FORMAT_BINARY)).isTrue();
        assertThat(jsonCodec.doCanDecode(JSONB, FORMAT_TEXT)).isTrue();
        assertThat(jsonCodec.doCanDecode(JSONB, FORMAT_BINARY)).isTrue();
        assertThat(jsonCodec.doCanDecode(MONEY, FORMAT_TEXT)).isFalse();
        assertThat(jsonCodec.doCanDecode(MONEY, FORMAT_BINARY)).isFalse();
    }

    @Test
    void doCanDecodeNoFormat() {
        assertThatIllegalArgumentException().isThrownBy(() -> new JsonCodec(TEST, true).doCanDecode(JSON, null))
            .withMessage("format must not be null");
    }

    @Test
    void doCanDecodeNoType() {
        assertThatIllegalArgumentException().isThrownBy(() -> new JsonCodec(TEST, true).doCanDecode(null, FORMAT_TEXT))
            .withMessage("type must not be null");
    }

    @Test
    void doEncode() {
        String json = "{\"name\":\"John Doe\"}";
        JsonCodec jsonCodec = new JsonCodec(TEST, true);

        assertThat(jsonCodec.doEncode(Json.of(json)))
            .hasFormat(FORMAT_BINARY)
            .hasType(JSONB.getObjectId())
            .hasValue(Unpooled.wrappedBuffer(Unpooled.wrappedBuffer(new byte[]{1}), ByteBufUtils.encode(TEST, json)));

        assertThat(jsonCodec.doEncode(Json.of(json.getBytes())))
            .hasFormat(FORMAT_BINARY)
            .hasType(JSONB.getObjectId())
            .hasValue(Unpooled.wrappedBuffer(Unpooled.wrappedBuffer(new byte[]{1}), ByteBufUtils.encode(TEST, json)));

        assertThat(jsonCodec.doEncode(Json.of(ByteBuffer.wrap(json.getBytes()))))
            .hasFormat(FORMAT_BINARY)
            .hasType(JSONB.getObjectId())
            .hasValue(Unpooled.wrappedBuffer(Unpooled.wrappedBuffer(new byte[]{1}), ByteBufUtils.encode(TEST, json)));

        assertThat(jsonCodec.doEncode(Json.of(new ByteArrayInputStream(json.getBytes()))))
            .hasFormat(FORMAT_BINARY)
            .hasType(JSONB.getObjectId())
            .hasValue(Unpooled.wrappedBuffer(Unpooled.wrappedBuffer(new byte[]{1}), ByteBufUtils.encode(TEST, json)));
    }

    @Test
    void doEncodeReleasedByteBuf() {
        String json = "{\"name\":\"John Doe\"}";
        JsonCodec jsonCodec = new JsonCodec(TEST, true);

        ByteBuf buffer = TEST.buffer();
        buffer.writeCharSequence(json, StandardCharsets.UTF_8);

        assertThat(jsonCodec.doEncode(Json.of(buffer)))
            .hasValue(Unpooled.wrappedBuffer(Unpooled.wrappedBuffer(new byte[]{1}), ByteBufUtils.encode(TEST, json)));

        assertThat(buffer.refCnt()).isZero();
    }

    @Test
    void doEncodeReleasedJsonOutput() {
        String json = "{\"name\":\"John Doe\"}";
        JsonCodec jsonCodec = new JsonCodec(TEST, true);
        Json decodedBytes = jsonCodec.decode(ByteBufUtils.encode(TEST, json), JSON.getObjectId(), FORMAT_TEXT, Json.class);

        assertThat(jsonCodec.doEncode(decodedBytes))
            .hasValue(Unpooled.wrappedBuffer(Unpooled.wrappedBuffer(new byte[]{1}), ByteBufUtils.encode(TEST, json)));

        assertThatIllegalStateException().isThrownBy(decodedBytes::asString).withMessage("JSON is already released");
    }

    @Test
    void doEncodeNoValue() {
        assertThatIllegalArgumentException().isThrownBy(() -> new JsonCodec(TEST, true).doEncode(null))
            .withMessage("value must not be null");
    }

    @Test
    void encodeNull() {
        assertThat(new JsonCodec(TEST, true).encodeNull())
            .isEqualTo(new EncodedParameter(FORMAT_BINARY, JSONB.getObjectId(), NULL_VALUE));
    }

}