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dummy flat text/csv file generator, typical usage scenario can be load / stress / performance testing of file-processing data tools

Project description

dummy_file_generator

version 1.0.7

a dummy csv or flat text files generator written in Python 3.7

This tool is able to generate dummy csv or flat txt files based on the configuration settings you setup for your project(s).

How to install and run the tool as CLI

How to install and run the tool as an imported package

How to setup a new dummy file generator project

How to add a new source dataset for your project

Pytest testing

How to install and run the tool as CLI

One common usage scenario can be load / stress / performance testing of file-processing data tools, allowing you to generate the files needed from a command line.

To install:

git clone https://github.com/datahappy1/dummy_file_generator c:\dummy_file_generator\
pip install -r requirements.txt

*You are strongly encouraged to use the Python virtual environment

To run:

The CLI tool needs these mandatory arguments defining:

  • projectname --projectname or -pn (mandatory argument, based on the projectname, the dummy file specific settings from /configurables/config.json file are loaded ),
  • absolutepath --absolutepath or -ap (mandatory argument) defining the full output file path to the file you wish to generate

The CLI tool can consume these optional arguments defining:

  • filesize --filesize or -fs (optional argument) defining the desired size (in kBs) of the output file
  • rowcount --rowcount or -rc (optional argument) defining the desired row count of the output file

*Note if you do NOT specify the filesize and do NOT specify the rowcount, the default row_count value ( set to 100 ) from settings.py will be used ( or the value you provide in the default_rowcount optional argument)

*these 5 optional arguments can be used to override values in configurables/settings.py:

  • logging_level --logging_level or -ll (optional argument) defining the Python logging level
  • default_rowcount --default_rowcount or -drc (optional argument) defining the rowcount fallback value when neither row_count,neither file_size set
  • file_encoding --file_encoding or -fen (optional argument) defining the generated files encoding
  • file_line_ending --file_line_ending or -fle (optional argument) defining the file line ending
  • csv_value_separator --csv_value_separator or -cvs (optional argument) defining the .csv file value separator

*these arguments are typically needed when running the tool as an importable library, but you can use them to change the location of the source data files and the config json with the project setup even with this tool running as CLI:

  • data_files_location --data_files_location or -dfl (optional argument) defining the path to the source .txt data files
  • config_json_path --config_json_path or -cjp (optional argument) defining the custom path to your config.json file

Example how to run :

  • with the -fs argument to set the desired filesize of 256 kB :
    cd c:\dummy_file_generator\dummy_file_generator
    python c:\dummy_file_generator\dummy_file_generator\__main__.py -pn dummy1 -ap c:\myfiles\dummy1file.csv -fs 256
  • with the -rc argument to set the desired rowcount of 1000 rows :
    cd c:\dummy_file_generator\dummy_file_generator
    python c:\dummy_file_generator\dummy_file_generator\__main__.py -pn dummy1 -ap c:\myfiles\dummy1file.csv -rc 1000

Pytest testing

Pytest unit and performance tests are also a part of this tool. You can install Pytest with pip install pytest
To run tests:
cd c:\dummy_file_generator\dummy_file_generator
pytest

How to install and run the tool as an imported package

One common usage scenario can be load / stress / performance testing of file-processing data tools, where you can now generate dummy text files during the test fixtures / setup.

To install:

pip install dummy-file-generator

To run:

The dummy file generator imported package needs these mandatory arguments defining:

  • projectname --projectname or -pn (mandatory argument, based on the projectname, the dummy file specific settings from config.json file are loaded ),
  • absolutepath --absolutepath or -ap (mandatory argument) defining the full output file path to the file you wish to generate

The dummy file generator imported package can consume these optional arguments defining:

  • filesize --filesize or -fs (optional argument) defining the desired size (in kBs) of the output file
  • rowcount --rowcount or -rc (optional argument) defining the desired row count of the output file

*Note if you do NOT specify the filesize and do NOT specify the rowcount, the default row_count value ( set to 100 ) from settings.py will be used ( or the value you provide in the default_rowcount optional argument)

  • data_files_location --data_files_location or -dfl (optional argument) defining the path to the source .txt data files
  • config_json_path --config_json_path or -cjp (optional argument) defining the custom path to your config.json file
  • logging_level --logging_level or -ll (optional argument) defining the Python logging level
  • default_rowcount --default_rowcount or -drc (optional argument) defining the rowcount fallback value when neither row_count,neither file_size set
  • file_encoding --file_encoding or -fen (optional argument) defining the generated files encoding
  • file_line_ending --file_line_ending or -fle (optional argument) defining the file line ending
  • csv_value_separator --csv_value_separator or -cvs (optional argument) defining the .csv file value separator

Example how to run :

from dummy_file_generator import DummyFileGenerator as DFG

def generate_dummy_file(project_name, absolute_path, file_size,
                        data_files_location, config_json_path):
    kwargs = {"project_name": project_name, "absolute_path": absolute_path,
              "file_size": file_size,
              "logging_level": "INFO",
              "data_files_location": data_files_location,
              "config_json_path": config_json_path,
              "file_encoding": "utf8",
              "csv_value_separator": "%",
              "file_line_ending": "\n"
              }

    obj = DFG(**kwargs)
    DFG.executor(obj)

generate_dummy_file(project_name="dummy1",
                    absolute_path="c:\myfiles\dummy1.csv", 
                    file_size=1024,
                    data_files_location="c:\\dummy_file_generator\dummy_file_generator\data_files",
                    config_json_path="c:\\dummy_file_generator\dummy_file_generator\configurables\config.json"
                    )

How to setup a new dummy file generator project

You need to generate dummy files based on the content of the text files in your "data_files" folder, and these source text files need to be setup for instance like this:

This tool picks random item from each of the files configured for your project in config.json and uses these values to populate the data for "columns" for each written row.

- How to generate a .csv file

Let's say you need to generate a dummy .csv file containing 3 columns for Names, Dates and IDs. The "project" JSON object in your config.json would need to be setup like:

{
  "project_name":"dummy1",
  "file_type":"csv",
  "header":true,
  "columns":[
    {
      "column_name":"Name",
      "datafile":"firstnames.txt"
    },
    {
      "column_name":"Date",
      "datafile":"dates.txt"
    },
    {
      "column_name":"ID",
      "datafile":"IDs.txt"
    }      
  ]
}

- How to generate a .txt flat file:

Let's say you need to generate a dummy .txt flat file containing 3 columns for Names, Dates and IDs with specific column lengths defined. The "project" JSON object in your config.json would need to be setup like:

{
  "project_name":"dummy1",
  "file_type":"flat",
  "header":true,
  "columns":[
    {
      "column_name":"Name",
      "column_len":6,
      "datafile":"firstnames.txt"
    },
    {
      "column_name":"Date",
      "column_len":10,
      "datafile":"dates.txt"
    },
    {
      "column_name":"ID",
      "column_len":9,
      "datafile":"IDs.txt"
    }      
  ]
}

How to add a new source dataset for your project

Whenever you need to add a new source .txt file in the data_files folder, just add it to your data_files folder. If running as a standalone CLI tool, the data_files folder is located here: dummy_file_generator/data_files

When running as an imported package, the data_files folder is whereever you set it in the argument data_files_location. Now you can use this new data file in your project setup in config.json file.

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