14 download and extract zip

[kejhy93]

PR Type

enhancement, tests

---

Description

• Introduced PIDClient class for downloading and extracting ZIP files using Spring WebClient.
• Implemented PIDController with a REST endpoint to trigger data download.
• Added unit tests for PIDClient and PIDController using MockWebServer and Mockito.
• Updated dependencies in pom.xml to include Spring WebFlux and MockWebServer.
• Configured application properties for PID client path.
• Added a sample curl request for testing the PID endpoint.

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Changes walkthrough 📝

	Relevant files
Enhancement	PIDClient.java Add PIDClient for downloading and extracting ZIP files      src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java Introduced PIDClient class to handle ZIP file downloads using Spring's WebClient. Implemented in-memory extraction of ZIP files. Added error handling for download and extraction processes. +80/-0    PIDController.java Implement PIDController with REST endpoint                              src/main/java/org/hejnaluk/metrotimetable/controller/PIDController.java Created PIDController class with a REST endpoint. Integrated PIDClient to handle GET requests. +27/-0
Tests	PIDClientTest.java Add unit tests for PIDClient with MockWebServer                    src/test/java/org/hejnaluk/metrotimetable/client/PIDClientTest.java Added unit tests for PIDClient using MockWebServer. Tested ZIP file download and extraction functionality. +71/-0    PIDControllerTest.java Add unit tests for PIDController                                                  src/test/java/org/hejnaluk/metrotimetable/controller/PIDControllerTest.java Added unit tests for PIDController. Verified interaction with PIDClient. +31/-0
Dependencies	pom.xml Update dependencies for WebFlux and testing                            pom.xml Added Spring WebFlux dependency for reactive programming. Added MockWebServer dependency for testing. +14/-0
Configuration changes	application.properties Add configuration for PID client path                                        src/main/resources/application.properties Added pid.client.path property for configuring the data source URL. +4/-1      application-test.properties Add test configuration for PID client path                              src/test/resources/application-test.properties - Added test configuration for `pid.client.path`. +4/-0
Documentation	request Add sample curl request for PID endpoint                                  src/main/resources/requests/request - Added a sample curl request for testing the PID endpoint. +1/-0

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💡 PR-Agent usage: Comment /help "your question" on any pull request to receive relevant information

[kejhy93]

/describe

[github-actions[bot]]

PR Description updated to latest commit (https://github.com/kejhy93/metro-timetable/commit/497fcac81131e302fcab1956a6f7d0d0ced07423)

[kejhy93]

/describe

[github-actions[bot]]

PR Description updated to latest commit (https://github.com/kejhy93/metro-timetable/commit/4040adc33d4171bcbaafb99a1dc43f88ca650295)

[kejhy93]

/help How to ask for improvements?

[github-actions[bot]]

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[kejhy93]

/improve

[kejhy93]

/improve

[github-actions[bot]]

PR Code Suggestions ✨

Latest suggestions up to c583f6c

Category	Suggestion	Score
Possible bug	Prevent potential NullPointerException by adding null checks for zipData ___ **Add null checks for zipData in the extractZipInMemory method to prevent NullPointerException when the byte array is null.** [src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java [47-48]](https://github.com/kejhy93/metro-timetable/pull/16/files#diff-52487d739b067e04d186026b049dbaea39f58b8922ac236f0c6951d4763d6f49R47-R48) ```diff private Mono extractZipInMemory(byte[] zipData) { + if (zipData == null) { + log.error("Zip data is null"); + return Mono.error(new IllegalArgumentException("Zip data must not be null")); + } try (InputStream inputStream = new java.io.ByteArrayInputStream(zipData); ZipInputStream zipInputStream = new ZipInputStream(inputStream)) { ... } } ``` Suggestion importance[1-10]: 10 Why: Adding null checks for `zipData` is crucial to prevent `NullPointerException`, which could cause the application to crash. This suggestion addresses a potential bug, making it highly impactful.	10
Best practice	Improve error handling by logging and rethrowing exceptions in the getData method ___ **Refactor the error handling in the getData method to log the error and rethrow it, ensuring that the error handling is consistent and traceable.** [src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java [43]](https://github.com/kejhy93/metro-timetable/pull/16/files#diff-52487d739b067e04d186026b049dbaea39f58b8922ac236f0c6951d4763d6f49R43-R43) ```diff -.onErrorResume(e -> Mono.just("Failed to download or extract ZIP: " + e.getMessage())); +.onErrorResume(e -> { + log.error("Failed to download or extract ZIP", e); + return Mono.error(e); +}) ``` Suggestion importance[1-10]: 9 Why: This suggestion enhances error handling by logging the error and rethrowing it, which improves traceability and consistency in error management, making it a significant improvement.	9
	Enhance resource management by ensuring ByteArrayOutputStream is closed properly ___ **Consider handling the potential resource leak from ByteArrayOutputStream in the extractZipInMemory method by using a try-with-resources statement.** [src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java [57-62]](https://github.com/kejhy93/metro-timetable/pull/16/files#diff-52487d739b067e04d186026b049dbaea39f58b8922ac236f0c6951d4763d6f49R57-R62) ```diff -ByteArrayOutputStream fileOutputStream = new ByteArrayOutputStream(); -byte[] buffer = new byte[1024]; -int length; -while ((length = zipInputStream.read(buffer)) > 0) { - fileOutputStream.write(buffer, 0, length); +try (ByteArrayOutputStream fileOutputStream = new ByteArrayOutputStream()) { + byte[] buffer = new byte[1024]; + int length; + while ((length = zipInputStream.read(buffer)) > 0) { + fileOutputStream.write(buffer, 0, length); + } } ``` Suggestion importance[1-10]: 8 Why: The suggestion to use a try-with-resources statement for `ByteArrayOutputStream` is valid and improves resource management by ensuring the stream is closed properly, preventing potential memory leaks.	8
Performance	Use parameterized logging for error messages to enhance performance and maintainability ___ **Replace the string concatenation with parameterized logging to improve performance and readability in the getData method.** [src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java [43]](https://github.com/kejhy93/metro-timetable/pull/16/files#diff-52487d739b067e04d186026b049dbaea39f58b8922ac236f0c6951d4763d6f49R43-R43) ```diff -.onErrorResume(e -> Mono.just("Failed to download or extract ZIP: " + e.getMessage())); +.onErrorResume(e -> { + log.error("Failed to download or extract ZIP: {}", e.getMessage()); + return Mono.just("Failed to download or extract ZIP: " + e.getMessage()); +}) ``` Suggestion importance[1-10]: 7 Why: The suggestion to use parameterized logging improves performance and readability by avoiding unnecessary string concatenation, which is a good practice for maintainability, though its impact is moderate compared to critical bug fixes.	7

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Previous suggestions

Suggestions up to commit 4040adc

Category	Suggestion	Score
Possible bug	Add error handling for non-successful HTTP response statuses ___ **Consider handling the case where the HTTP response status is not successful (e.g., not 200 OK) before processing the InputStream. This ensures that only valid responses are processed, preventing potential issues with invalid data.** [src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java [52-53]](https://github.com/kejhy93/metro-timetable/pull/16/files#diff-52487d739b067e04d186026b049dbaea39f58b8922ac236f0c6951d4763d6f49R52-R53) ```diff final var response = client.send(request, HttpResponse.BodyHandlers.ofInputStream()); +if (response.statusCode() != 200) { + throw new IOException("Failed to download file, HTTP status: " + response.statusCode()); +} return response.body(); ``` Suggestion importance[1-10]: 9 Why: This suggestion addresses a critical issue by adding error handling for non-successful HTTP responses, which prevents processing invalid data and potential application errors.	9
Best practice	Ensure proper closure of resources to prevent memory leaks ___ **Ensure that resources such as ByteArrayOutputStream are properly closed to prevent memory leaks. Use try-with-resources or manually close these resources in a finally block.** [src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java [65-70]](https://github.com/kejhy93/metro-timetable/pull/16/files#diff-52487d739b067e04d186026b049dbaea39f58b8922ac236f0c6951d4763d6f49R65-R70) ```diff -ByteArrayOutputStream fileOutputStream = new ByteArrayOutputStream(); -byte[] buffer = new byte[1024]; -int length; -while ((length = zipInputStream.read(buffer)) > 0) { - fileOutputStream.write(buffer, 0, length); +try (ByteArrayOutputStream fileOutputStream = new ByteArrayOutputStream()) { + byte[] buffer = new byte[1024]; + int length; + while ((length = zipInputStream.read(buffer)) > 0) { + fileOutputStream.write(buffer, 0, length); + } } ``` Suggestion importance[1-10]: 8 Why: The suggestion improves resource management by ensuring `ByteArrayOutputStream` is closed properly, preventing memory leaks and enhancing code reliability.	8
Enhancement	Add logging for HTTP requests to improve traceability ___ **Consider logging the URL being requested for better traceability and debugging of the HTTP requests made by the application.** [src/main/java/org/hejnaluk/metrotimetable/client/PIDClient.java [48-49]](https://github.com/kejhy93/metro-timetable/pull/16/files#diff-52487d739b067e04d186026b049dbaea39f58b8922ac236f0c6951d4763d6f49R48-R49) ```diff +log.info("Requesting ZIP file from URL: {}", zipFileUrl); final var request = HttpRequest.newBuilder() .uri(URI.create(zipFileUrl)) .build(); ``` Suggestion importance[1-10]: 7 Why: Adding logging for HTTP requests enhances traceability and debugging capabilities, which is beneficial for monitoring and diagnosing issues in the application.	7

[kejhy93]

/describe

[github-actions[bot]]

PR Description updated to latest commit (https://github.com/kejhy93/metro-timetable/commit/c583f6ca511ad4f413b3c1a342ae747cbb461f27)

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[kejhy93]

/review

[github-actions[bot]]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 3 🔵🔵🔵⚪⚪

🧪 PR contains tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Error Handling The error handling in the getData method might not properly propagate errors due to the use of Mono.just after onErrorResume. This could lead to misleading success messages even when an error occurs. Resource Management The method extractZipInMemory uses a ZipInputStream and ByteArrayOutputStream but does not explicitly handle resource leaks which might occur if an exception is thrown before the streams are closed. Thread Safety The WebClient instance in PIDClient is shared across multiple threads but its thread safety is not clearly documented. This could potentially lead to issues if the WebClient is not fully thread-safe.