DynamicCompile

DynamicCompile transform plugin

Description

tip

important clause You need to ensure the security of your service and prevent attackers from uploading destructive code

Provide a programmable way to process rows, allowing users to customize any business behavior, even RPC requests based on existing row fields as parameters, or to expand fields by retrieving associated data from other data sources. To distinguish businesses, you can also define multiple transforms to combine, If the conversion is too complex, it may affect performance

Options

name	type	required	default value
source_code	string	no
compile_language	Enum	yes
compile_pattern	Enum	no	SOURCE_CODE
absolute_path	string	no

common options [string]

Transform plugin common parameters, please refer to Transform Plugin for details

compile_language [Enum]

Some syntax in Java may not be supported, please refer https://github.com/janino-compiler/janino GROOVY,JAVA

compile_pattern [Enum]

SOURCE_CODE,ABSOLUTE_PATH If it is a SOURCE-CODE enumeration; the SOURCE-CODE attribute is required, and the ABSOLUTE_PATH enumeration;ABSOLUTE_PATH attribute is required

absolute_path [string]

The absolute path of Java or Groovy files on the server

source_code [string]

The source code.

Details about the source code

In the source code, you must implement two method:

• Column[] getInlineOutputColumns(CatalogTable inputCatalogTable)
• Object[] getInlineOutputFieldValues(SeaTunnelRowAccessor inputRow)

getInlineOutputColumns method, input parameter is CatalogTable, return type is Column[].
you can get the current table's schema from CatalogTable.
if the return column exist in current schema, then it will overwrite by returned value (field type, comment, ...), if it's a new column, it will add into current schema.

getInlineOutputFieldValues method, input parameter is SeaTunnelRowAccessor, return type is Object[] You can get the record from SeaTunnelRowAccessor, do you own customized data process logical.
The return Object[] array length should match with getInlineOutputColumns method result's length. and the order also need be match.

If there are third-party dependency packages, please place them in ${SEATUNNEL_HOME}/lib, if you use spark or flink, you need to put it under the libs of the corresponding service. You need restart the server to load the lib file.

Example

The data read from source is a table like this:

name	age	card
Joy Ding	20	123
May Ding	20	123
Kin Dom	30	123
Joy Dom	30	123

Use this DynamicCompile to add a new column compile_language, and update the age field by its original value (if age = 20, update to 40)

• use groovy

transform {
 DynamicCompile {
    source_table_name = "fake"
    result_table_name = "groovy_out"
    compile_language="GROOVY"
    compile_pattern="SOURCE_CODE"
    source_code="""
                 import org.apache.seatunnel.api.table.catalog.Column
                 import org.apache.seatunnel.transform.common.SeaTunnelRowAccessor
                 import org.apache.seatunnel.api.table.catalog.CatalogTable
                 import org.apache.seatunnel.api.table.catalog.PhysicalColumn;
                 import org.apache.seatunnel.api.table.type.*;
                 import java.util.ArrayList;
                 class demo  {
                    public Column[] getInlineOutputColumns(CatalogTable inputCatalogTable) {
                        PhysicalColumn col1 =
                                PhysicalColumn.of(
                                        "compile_language",
                                        BasicType.STRING_TYPE,
                                        10L,
                                        true,
                                        "",
                                        "");
                        PhysicalColumn col2 =
                                PhysicalColumn.of(
                                        "age",
                                        BasicType.INT_TYPE,
                                        0L,
                                        false,
                                        false,
                                        ""
                                );
                        return new Column[]{
                                col1, col2
                        };
                    }
                
                
                    public Object[] getInlineOutputFieldValues(SeaTunnelRowAccessor inputRow) {
                        Object[] fieldValues = new Object[2];
                        // get age 
                        Object ageField = inputRow.getField(1);
                        fieldValues[0] = "GROOVY";
                        if (Integer.parseInt(ageField.toString()) == 20) {
                            fieldValues[1] = 40;
                        } else {
                            fieldValues[1] = ageField;
                        }
                        return fieldValues;
                    }
                 };"""

  }
}

• use java

transform {
 DynamicCompile {
    source_table_name = "fake"
    result_table_name = "java_out"
    compile_language="JAVA"
    compile_pattern="SOURCE_CODE"
    source_code="""
                 import org.apache.seatunnel.api.table.catalog.Column;
                 import org.apache.seatunnel.transform.common.SeaTunnelRowAccessor;
                 import org.apache.seatunnel.api.table.catalog.*;
                 import org.apache.seatunnel.api.table.type.*;
                 import java.util.ArrayList;
                    public Column[] getInlineOutputColumns(CatalogTable inputCatalogTable) {
                        PhysicalColumn col1 =
                                PhysicalColumn.of(
                                        "compile_language",
                                        BasicType.STRING_TYPE,
                                        10L,
                                        true,
                                        "",
                                        "");
                        PhysicalColumn col2 =
                                PhysicalColumn.of(
                                        "age",
                                        BasicType.INT_TYPE,
                                        0L,
                                        false,
                                        false,
                                        ""
                                );
                        return new Column[]{
                                col1, col2
                        };
                    }
                
                
                    public Object[] getInlineOutputFieldValues(SeaTunnelRowAccessor inputRow) {
                        Object[] fieldValues = new Object[2];
                        // get age 
                        Object ageField = inputRow.getField(1);
                        fieldValues[0] = "JAVA";
                        if (Integer.parseInt(ageField.toString()) == 20) {
                            fieldValues[1] = 40;
                        } else {
                            fieldValues[1] = ageField;
                        }
                        return fieldValues;
                    }
                """

  }
 } 

• use absolute path to read code

 transform {
 DynamicCompile {
    source_table_name = "fake"
    result_table_name = "groovy_out"
    compile_language="GROOVY"
    compile_pattern="ABSOLUTE_PATH"
    absolute_path="""/tmp/GroovyFile"""

  }
}

Then the data in result table groovy_out will like this

name	age	card	compile_language
Joy Ding	40	123	GROOVY
May Ding	40	123	GROOVY
Kin Dom	30	123	GROOVY
Joy Dom	30	123	GROOVY

Then the data in result table java_out will like this

name	age	card	compile_language
Joy Ding	40	123	JAVA
May Ding	40	123	JAVA
Kin Dom	30	123	JAVA
Joy Dom	30	123	JAVA

More complex examples can be referred to https://github.com/apache/seatunnel/tree/dev/seatunnel-e2e/seatunnel-transforms-v2-e2e/seatunnel-transforms-v2-e2e-part-2/src/test/resources/dynamic_compile/conf

Changelog