How to Unzip Files in Ktor POST Routing скачать в хорошем качестве

How to Unzip Files in Ktor POST Routing

Learn how to handle GZip uncompressed requests in Ktor using POST routing to efficiently process zipped files. --- This video is based on the question https://stackoverflow.com/q/67421249/ asked by the user 'Coyado' ( https://stackoverflow.com/u/15854632/ ) and on the answer https://stackoverflow.com/a/67486097/ provided by the user 'Aleksei Tirman' ( https://stackoverflow.com/u/13963150/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: KTOR - Unzip file in POST routing Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- How to Unzip Files in Ktor POST Routing Handling zipped files in Ktor can seem daunting, especially when you're trying to receive compressed content as part of an HTTP request. If you're facing issues with unzipping files sent in the body of a POST request, you’ve come to the right place! In this guide, we'll walk through a common issue developers encounter when trying to work with GZip encoded files in their Ktor applications and provide you with a clear solution. The Problem Imagine you're building a web service with Ktor that needs to accept and process zipped files. You're trying to use the following snippet to receive a compressed file in your POST request: [[See Video to Reveal this Text or Code Snippet]] However, you quickly run into an error: [[See Video to Reveal this Text or Code Snippet]] This error indicates that your current approach to managing I/O is running into concurrency issues. The solution lies in correctly handling your blocking calls and utilizing Kotlin's Coroutine features efficiently. The Solution To effectively unzip the GZip file within your POST request, you'll want to adjust your approach as follows. Below, we’ll break down the steps needed to correctly implement the solution. Step 1: Set Up Your Environment Firstly, ensure you have your Ktor application set up correctly. You'll need to include the necessary Ktor dependencies in your build system (like Gradle or Maven). [[See Video to Reveal this Text or Code Snippet]] Step 2: Implement the GZip Unzipping Logic Here's a detailed implementation of how to correctly handle GZip uncompressed requests in Ktor: [[See Video to Reveal this Text or Code Snippet]] Explanation of the Code Import Required Libraries: Necessary libraries from Ktor and Kotlin coroutines are imported at the top. Define Main Function: The main function sets up the Ktor server and starts listening on port 9090. Define Routing: The routing block defines a POST route at the root ("/"). Use withContext: This enables the execution of I/O-bound code in a coroutine-friendly way, thus avoiding the blocking call issue. Receive Stream: The code receives the input stream directly from the HTTP request body. Decompress with GZIPInputStream: The input stream is passed to GZIPInputStream, which handles the decompression. Read Bytes to String: The uncompressed data is then read, converted into a string, and can be printed or further processed. Conclusion With the solution outlined above, you'll be able to efficiently handle GZip encoded files sent as part of a POST request in your Ktor application. By utilizing coroutines and switching to an appropriate dispatcher, you can avoid concurrency issues while managing I/O effectively. Feel free to reach out if you have further questions or need additional assistance with Ktor or Kotlin development. Happy coding!