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Overview

The Remote Python Script Snap is a Transform type Snap that enables you to execute a Python script on a Remote Python Executor (RPE). The RPE can be installed on the same node as the JCC or elsewhere. The location of the RPE is specified in the account. See Remote Python Executor Installation for steps on installing the RPE.

SnapLogic Documentation > Remote Python Script > RemPythonScript.png

The Snap has an additional Input and Output view. You can use the second Input view to pass a script to the Snap, in which case the default script within the Snap is ignored. This is useful in case the script is stored in external locations such as GitHub or SFTP server. The second Output view shows the standard output (STDOUT) redirected from the RPE.

Input and Output

Expected input:

First input view: The document upon which the Python script is to be executed.
Second input view: The Python script to be executed.

Expected output:

First output view: The output from the Python script's execution.
Second output view: The STDOUT redirected from the RPE.

Expected upstream Snaps:

First input view: Any Snap that has a document output view. For example, CSV Generator, or a combination of File Reader and CSV Parser.
Second input view: You can use Snaps that read script files from the SLDB or external locations such as GitHub. For example, a combination of File Reader and Binary to Document.

Expected downstream Snaps:

First output view: Any Snap that accepts a document input. For example, Mapper, or a combination of JSON Formatter and File Writer.
Second output view: Any Snap that accepts a document input. For example, Mapper, or a combination of Document to Binary and File Writer.

Prerequisites

The RPE should be installed and running before using this Snap. See Remote Python Executor Installation for steps to install the RPE.

Configuring Accounts

This Snap uses account references created on the Accounts page of SnapLogic Manager to handle access to this endpoint. See Remote Python Executor Account for information on setting up this type of account.

Configuring Views

Input	This Snap has at most two document input views.
Output	This Snap has at least one and at most two document output views.
Error	This Snap has at most one document error view.

Troubleshooting

None.

Limitations and Known Issues

None.

Modes

Ultra Pipelines: Works in Ultra Pipelines.

Snap Settings

Label

Required. The name for the Snap. Modify this to be more specific, especially if there are more than one of the same Snap in the pipeline.

Edit Script

Required. The Python script to be executed. Click Edit Script to open the script editor. The editor contains a default Python script, edit it as required or supply another script through the second input view.

The default script writes the input documents to the $original field in the output.

Default value: Default Python script as shown below:

#Imports

#Global Variables

#This function will be executed once before consuming the data.
def snaplogic_init():
    return None

#This function will be executed on each document from the upstream snap.
def snaplogic_process(row):
    output = {}
    output["original"] = row
    return output

#This function will be executed after consuming all documents from the upstream snap.
def snaplogic_final():
    return None

There are three main functions:

snaplogic_init
snaplogic_process
snaplogic_final

The first function (snaplogic_init) is executed before consuming input data. The second function (snaplogic_process) is called on each of the incoming documents. The last function (snaplogic_final) is processed after all incoming documents have been consumed by snaplogic_process.

Examples

Case Conversion

This example demonstrates using a Python script to convert all lower-case characters in an incoming document to upper-case characters.

Download this pipeline.

The input to the Remote Pyhon Script Snap is a CSV document generated by the CSV Generator Snap. Below is a preview of the CSV Generator Snap's output:

SnapLogic Documentation > Remote Python Script > Input.PNG

The Remote Python Script Snap is configured with the following script:

#Imports

#Global Variables

#This function will be executed once before consuming the data.
def snaplogic_init():
    return None

#This function will be executed on each document from the upstream snap.
def snaplogic_process(row):
    return {"text": row["text"].upper()}

#This function will be executed after consuming all documents from the upstream snap.
def snaplogic_final():
    return None

When executed, the script converts all lower-case characters in $text to upper-case characters. This is shown in the output preview of the Remote Python Script Snap below:

SnapLogic Documentation > Remote Python Script > Output.PNG