Field values from external commands

[borisershov]

Add an ability to create a field values from external commands.

[borisershov]

The solution of this issue will be represented as an additional type command of column value:

...

filters:
  some_table_name:
    columns:
      some_column_name:
        type: command
        value: /path/to/command/or/script.sh
        
...

If the type: command set for column, the value of the field value considered as path to command that will be executed every time for this field. An additional environment variables will be available within the runtime of the specified command:

ENVVARTABLE={TABLE_NAME}: contains a name of the filtered table
ENVVARCOLUMN_{COLUMN_NAME}={COLUMN_VALUE}: contains all columns and its values (before substitutions) for the current filtered row

The stdout of the command considered as new value for the filtered field.

[borisershov]

As a result the command's concept has following properties:

• The command's stdout will be used as a new value for the anonymized field
• Command must return zero exit code, otherwise nxs-data-anonymizer will falls with error (in this case stderr will be used as an error text)
• Environment variables with the row data are available within the command:
  • ENVVARTABLE: contains a name of the filtered table
  • ENVVARCURCOLUMN: contains the current column name
  • ENVVARCOLUMN_{COLUMN_NAME}: contains values (before substitutions) for all columns for the current row

[borisershov]

Closed in Release v1.4.0