backends-common/postgres/src/test/java/org/apache/james/backends/postgres/JamesPostgresConnectionFactoryTest.java

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package org.apache.james.backends.postgres;

import static org.assertj.core.api.Assertions.assertThat;

import java.util.Optional;

import org.apache.james.backends.postgres.utils.JamesPostgresConnectionFactory;
import org.apache.james.core.Domain;
import org.junit.jupiter.api.Test;

import com.google.common.collect.ImmutableList;

import io.r2dbc.spi.Connection;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

public abstract class JamesPostgresConnectionFactoryTest {

    abstract JamesPostgresConnectionFactory jamesPostgresConnectionFactory();

    @Test
    void getConnectionShouldWork() {
        Connection connection = jamesPostgresConnectionFactory().getConnection(Optional.empty()).block();
        String actual = Flux.from(connection.createStatement("SELECT 1")
                .execute())
            .flatMap(result -> result.map((row, rowMetadata) -> row.get(0, String.class)))
            .collect(ImmutableList.toImmutableList())
            .block().get(0);

        assertThat(actual).isEqualTo("1");
    }

    @Test
    void getConnectionWithDomainShouldWork() {
        Connection connection = jamesPostgresConnectionFactory().getConnection(Domain.of("james")).block();
        String actual = Flux.from(connection.createStatement("SELECT 1")
                .execute())
            .flatMap(result -> result.map((row, rowMetadata) -> row.get(0, String.class)))
            .collect(ImmutableList.toImmutableList())
            .block().get(0);

        assertThat(actual).isEqualTo("1");
    }

    @Test
    void getConnectionShouldSetCurrentDomainAttribute() {
        Domain domain = Domain.of("james");
        Connection connection = jamesPostgresConnectionFactory().getConnection(domain).block();
        String actual = getDomainAttributeValue(connection);

        assertThat(actual).isEqualTo(domain.asString());
    }

    @Test
    void getConnectionWithoutDomainShouldReturnEmptyAttribute() {
        Connection connection = jamesPostgresConnectionFactory().getConnection(Optional.empty()).block();

        String message = Flux.from(connection.createStatement("show " + JamesPostgresConnectionFactory.DOMAIN_ATTRIBUTE)
                .execute())
            .flatMap(result -> result.map((row, rowMetadata) -> row.get(0, String.class)))
            .collect(ImmutableList.toImmutableList())
            .map(strings -> "")
            .onErrorResume(throwable -> Mono.just(throwable.getMessage()))
            .block();

        assertThat(message).isEqualTo("");
    }

    String getDomainAttributeValue(Connection connection) {
        return Flux.from(connection.createStatement("show " + JamesPostgresConnectionFactory.DOMAIN_ATTRIBUTE)
                .execute())
            .flatMap(result -> result.map((row, rowMetadata) -> row.get(0, String.class)))
            .collect(ImmutableList.toImmutableList())
            .block().get(0);
    }

}