[jira] [Work logged] (GOBBLIN-1225) Multistage Generic Connector for HTTP Protocol and JSON Format

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GOBBLIN-1225?focusedWorklogId=534674&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-534674 ]

ASF GitHub Bot logged work on GOBBLIN-1225:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 12/Jan/21 05:11
            Start Date: 12/Jan/21 05:11
    Worklog Time Spent: 10m 
      Work Description: chris9692 opened a new pull request #3198:
URL: https://github.com/apache/incubator-gobblin/pull/3198


   Dear Gobblin maintainers,
   
   Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!
   
   ### JIRA
   - [X] My PR addresses the following [Gobblin JIRA](https://issues.apache.org/jira/browse/GOBBLIN/) issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
       - https://issues.apache.org/jira/browse/GOBBLIN-1225
   
   
   ### Description
   - [X] Here are some details about my PR, including screenshots (if applicable):
   
   Many HTTP data sources, including OData and GraphQL based data sources, use a set of common HTTP request methods,
   but their parameters can vary significantly case by case. The Gobblin ecosystem has multiple connectors that were
   built to suite those needs, for example, the Salesforce connector, the Google Search Console connector, etc.
   
   Multistage connector framework is a paradigm that makes connectors more generic and more reusable. We have used this framework to address the huge variety challenge in data integration with external data sources. 
   
   HTTP data sources are the top beneficiary of this framework, including Rest API, OData, and SOAP based data sources. S3 and GCS (Google Cloud Storage) data sources can also benefit from it in small data volumes that are less than 10TB, without using SDK. 
   
   We have also verified the HTTP Multistage connector can greatly simplify data ingestion from Salesforce.com. However, this PR doesn't included the necessary component, CSV Extractor, yet. 
   
   This PR includes following functionalities:
   	- This PR contains a separate multistage module that works with HTTP data sources
   	- It supports HTTP GET, PUT, POST, and DELETE operations
   	- It supports nested JSON format
   	- It supports Rest API calls and its derived OData service
   	- It supports following ways of pagination
   		○ By offset and page size
   		○ By page number
   		○ By a total record count
   		○ By signal of an empty response
   		○ By next page URL
   		○ By a cursor or next page locator
   	- It supports session state control as a mechanism of pagination or asynchronous requests
   	- It supports pulling files from GCS or S3 via HTTP requests
   	- It supports field project, including nested field projection, based on a given schema
   
   ### Tests
   - [X] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   All 113 unit tests were successful.
   
   ### Commits
   - [X] My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
       1. Subject is separated from body by a blank line
       2. Subject is limited to 50   ##characters
       3. Subject does not end with a period
       4. Subject uses the imperative mood ("add", not "adding")
       5. Body wraps at 72 characters
       6. Body explains "what" and "why", not "how"
   
   


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 534674)
    Remaining Estimate: 0h
            Time Spent: 10m

> Multistage Generic Connector for HTTP Protocol and JSON Format
> --------------------------------------------------------------
>
>                 Key: GOBBLIN-1225
>                 URL: https://issues.apache.org/jira/browse/GOBBLIN-1225
>             Project: Apache Gobblin
>          Issue Type: Sub-task
>          Components: gobblin-connectors
>            Reporter: Chris Li
>            Assignee: Shirshanka Das
>            Priority: Major
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> This change includes:
>  * Multistage connector base classes
>  * HttpSource class
>  * JsonExtractor class
>  * Utility classes



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