Add StringValueToByteArray converter

Closes #230

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## [Unreleased]
 
+- Add StringValueToByteArray converter ([#230](https://github.com/tarantool/cartridge-java/issues/230))
+
 ## [0.8.0] - 2022-05-20
 
 ### Features

src/main/java/io/tarantool/driver/mappers/DefaultMessagePackMapperFactory.java

@@ -25,6 +25,7 @@
 import io.tarantool.driver.mappers.converters.value.DefaultIntegerValueToDoubleConverter;
 import io.tarantool.driver.mappers.converters.value.DefaultIntegerValueToFloatConverter;
 import io.tarantool.driver.mappers.converters.value.DefaultIntegerValueToLongConverter;
+import io.tarantool.driver.mappers.converters.value.DefaultStringValueToByteArrayConverter;
 import io.tarantool.driver.mappers.converters.value.DefaultStringValueToCharacterConverter;
 import io.tarantool.driver.mappers.converters.value.DefaultStringValueToStringConverter;
 import org.msgpack.value.BinaryValue;
@@ -56,6 +57,7 @@ public final class DefaultMessagePackMapperFactory {
     private DefaultMessagePackMapperFactory() {
         defaultSimpleTypesMapper = new DefaultMessagePackMapper.Builder()
                 // converters for primitive values
+                .withValueConverter(ValueType.STRING, byte[].class, new DefaultStringValueToByteArrayConverter())
                 .withValueConverter(ValueType.STRING, Character.class, new DefaultStringValueToCharacterConverter())
                 .withValueConverter(ValueType.STRING, String.class, new DefaultStringValueToStringConverter())
                 .withValueConverter(ValueType.INTEGER, Float.class, new DefaultIntegerValueToFloatConverter())

src/main/java/io/tarantool/driver/mappers/converters/value/DefaultStringValueToByteArrayConverter.java

@@ -0,0 +1,19 @@
+package io.tarantool.driver.mappers.converters.value;
+
+import io.tarantool.driver.mappers.converters.ValueConverter;
+import org.msgpack.value.StringValue;
+
+/**
+ * Default {@link StringValue} to {@code byte[]} converter
+ *
+ * @author Artyom Dubinin
+ */
+public class DefaultStringValueToByteArrayConverter implements ValueConverter<StringValue, byte[]> {
+
+    private static final long serialVersionUID = 20220601L;
+
+    @Override
+    public byte[] fromValue(StringValue value) {
+        return value.asByteArray();
+    }
+}

src/test/java/io/tarantool/driver/integration/ConvertersWithProxyClientIT.java

@@ -85,4 +85,23 @@ public void test_crudOperations_shouldWorkWithVarbinary() throws Exception {
         List<Byte> byteListFromTarantool = Arrays.asList(ArrayUtils.toObject(bytesFromTarantool));
         Assertions.assertEquals(byteList, byteListFromTarantool);
     }
+
+    @Test
+    public void test_crudOperations_shouldWorkWithBytesAsString() throws Exception {
+        //given
+        byte[] bytes = "hello".getBytes(StandardCharsets.UTF_8);
+        List<Byte> byteList = Arrays.asList(ArrayUtils.toObject(bytes));
+        client.space("space_with_string")
+                .insert(tupleFactory.create(1, bytes)).get();
+
+        //when
+        TarantoolTuple fields = client
+                .space("space_with_string")
+                .select(Conditions.equals("id", 1)).get().get(0);
+
+        //then
+        byte[] bytesFromTarantool = fields.getByteArray("string_field");
+        List<Byte> byteListFromTarantool = Arrays.asList(ArrayUtils.toObject(bytesFromTarantool));
+        Assertions.assertEquals(byteList, byteListFromTarantool);
+    }
 }

src/test/java/io/tarantool/driver/mappers/DefaultStringValueToByteArrayConverterTest.java

@@ -0,0 +1,25 @@
+package io.tarantool.driver.mappers;
+
+import io.tarantool.driver.mappers.converters.value.DefaultStringValueToByteArrayConverter;
+import org.junit.jupiter.api.Test;
+import org.msgpack.value.ValueFactory;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @author Artyom Dubinin
+ */
+public class DefaultStringValueToByteArrayConverterTest {
+
+    @Test
+    public void test_shouldConvertCorrectly() {
+        //given
+        DefaultStringValueToByteArrayConverter converter = new DefaultStringValueToByteArrayConverter();
+
+        //when
+        byte[] actual = converter.fromValue(ValueFactory.newString("Hello"));
+
+        //then
+        assertEquals("Hello", new String(actual));
+    }
+}

src/test/resources/cartridge/app/roles/api_storage.lua

@@ -145,6 +145,21 @@ local function init_space()
         space_with_varbinary:create_index('bucket_id', { parts = { 'bucket_id' }, unique = false, if_not_exists = true, })
     end
 
+    local space_with_string = box.schema.space.create(
+            'space_with_string',
+            {
+                format = {
+                    { 'id', 'unsigned' },
+                    { 'string_field', 'string',},
+                    { 'bucket_id', 'unsigned' },
+                },
+                if_not_exists = true,
+            }
+    )
+
+    space_with_string:create_index('id', { parts = { 'id' }, if_not_exists = true, })
+    space_with_string:create_index('bucket_id', { parts = { 'bucket_id' }, unique = false, if_not_exists = true, })
+
     -- cursor test spaces
     local cursor_test_space = box.schema.space.create('cursor_test_space', { if_not_exists = true })
     cursor_test_space:format({