merrimanr opened a new pull request #1440: METRON-2148: Stellar REST POST function URL: https://github.com/apache/metron/pull/1440 ## Contributor Comments This PR adds a `REST_POST` Stellar function with syntax and options similar to the existing `REST_GET` function for performing REST POST requests. A Stellar map can now be passed into the function and added to the request as query parameters (this feature was added to `REST_GET` as well). Separate global configs were added for `REST_GET` and `REST_POST` in addition to the existing global config for REST functions. For `REST_POST` requests, there is also an option `enforce.json` that ensures POST data is well-formed JSON. ### Changes Included - `REST_POST` Stellar function was added to `RestFunctions` class. - `RestFunctions` class was refactored by moving common code used by `REST_GET` and `REST_POST` to their own methods. Now code specific to either functions mostly consists of argument parsing and request building. - Unit and integration tests were moved to separate tests. The `RestFunctions` class should be 100% covered. - Documentation added for the new `REST_POST` function and additional options added to both. ### Testing This has been tested in full dev. Since there were significant changes to `RestFunctions` I regression tested using the test instructions in original [Stellar Rest PR](https://github.com/apache/metron/pull/1250). Note a regression was introduced when using the `REST_GET` function in the enrichment topology (class version error). This is being addressed [here](https://github.com/apache/metron/pull/1436). In addition to this I also followed these instructions: 1. Assuming full dev has already been spun up during regression testing described above, start the Stellar shell with `/usr/metron/0.7.2/bin/stellar --zookeeper node1:2181`. 2. Defined a variable to hold POST data: ``` [Stellar]>>> data := {'key':'value'} {key=value} ``` 3. Send a POST request to a test service (httpbin.org in this example): ``` [Stellar]>>> REST_POST('http://httpbin.org/post', data) {args={}, data={"key":"value"}, files={}, form={}, headers={Accept=application/json, Accept-Encoding=gzip,deflate, Content-Length=15, Content-Type=application/json, Host=httpbin.org, User-Agent=Apache-HttpClient/4.3.2 (java 1.5)}, json={key=value}, origin=136.49.31.47, 136.49.31.47, url=https://httpbin.org/post} ``` The request should succeed with the correct POST data in the response. 4. Define a variable to hold query parameters: ``` [Stellar]>>> params := {'param1': 'value1', 'param2': 'value2'} {param1=value1, param2=value2} ``` 5. Send a POST request, passing in the query parameter variable: ``` [Stellar]>>> REST_POST('http://httpbin.org/post', data, {}, params) {args={param1=value1, param2=value2}, data={"key":"value"}, files={}, form={}, headers={Accept=application/json, Accept-Encoding=gzip,deflate, Content-Length=15, Content-Type=application/json, Host=httpbin.org, User-Agent=Apache-HttpClient/4.3.2 (java 1.5)}, json={key=value}, origin=136.49.31.47, 136.49.31.47, url=https://httpbin.org/post?param1=value1¶m2=value2} ``` The `args` and `url` attributes in the response should contain the query parameters. 6. Test configuration priority by changing the empty response override in various configs. First enable 404 responses and set an override: ``` %define stellar.rest.settings := {'response.codes.allowed': [200, 404], 'empty.content.override': {}} [Stellar]>>> REST_POST('http://httpbin.org/status/404', data) {} ``` The response should match the override value set in the config. 7. Configure the override for all REST functions: ``` [Stellar]>>> REST_POST('http://httpbin.org/status/404', data) global rest config ``` The response should match the global override value set in the config. 8. Configure the override for REST_POST functions: ``` [Stellar]>>> %define stellar.rest.post.settings := {'empty.content.override': 'rest post config'} {empty.content.override=rest post config} [Stellar]>>> REST_POST('http://httpbin.org/status/404', data) rest post config ``` The response should match the rest post override value set in the config. 9 Configure the override in a variable that will be passed to the function: ``` [Stellar]>>> config := {'empty.content.override': 'function config'} {empty.content.override=function config} [Stellar]>>> REST_POST('http://httpbin.org/status/404', data, config) function config ``` The response should match the override in the config passed to the function. ## Pull Request Checklist Thank you for submitting a contribution to Apache Metron. Please refer to our [Development Guidelines](https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=61332235) for the complete guide to follow for contributions. Please refer also to our [Build Verification Guidelines](https://cwiki.apache.org/confluence/display/METRON/Verifying+Builds?show-miniview) for complete smoke testing guides. In order to streamline the review of the contribution we ask you follow these guidelines and ask you to double check the following: ### For all changes: - [x] Is there a JIRA ticket associated with this PR? If not one needs to be created at [Metron Jira](https://issues.apache.org/jira/browse/METRON/?selectedTab=com.atlassian.jira.jira-projects-plugin:summary-panel). - [x] Does your PR title start with METRON-XXXX where XXXX is the JIRA number you are trying to resolve? 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