Pdfkit async await8/22/2023 Also Promise.all is nice when we are waiting for many tasks simultaneously. in the outermost scope) we have to use these methods. PDFKit not working in AWS Lambda 975 Closed balaji668 opened this issue on 13 comments balaji668 commented on edited pdfkit version: Node version:8.10 Browser version (if applicable): Operating System: AWS VM Sign in to view mentioned this issue Sign up for free to join this conversation on GitHub. PDFKit doesnt actually know when all of the data has been flushed to whatever stream youre writing to (file, http response, etc.). NOTE: All the public API functions are adapted to async coroutines, so use them with await This is adapted version of python-PDFKit library, so big thanks to them Installation Install pdfgen: pip install pdfgen To download Chromium beforehand, run pdfgen-setup. With async/await we rarely need to write promise.then/catch, but we still shouldn’t forget that they are based on promises, because sometimes (e.g. Python 3.6.1+ async wrapper for Pyppeteer to convert HTML to PDF. Together they provide a great framework to write asynchronous code that is easy to both read and write. await can only be used inside an async method. It is not always apparent whether the current file is a script or a module see the Modules guide for more information. Therefore, await cannot be used in sync tasks, such as functions, generator functions, or top level of scripts. When the await keyword is applied, it suspends the calling method and yields control back to its caller until the awaited task is complete. Instead, it pauses the execution of the surrounding async task, while allowing other tasks to continue running. You need to create a promise and await for this promise to finish in the end of these two operations. That's why you always have Hi in your returnData var. If it’s an error, an exception is generated - same as if throw error were called at that very place. The async keyword turns a method into an async method, which allows you to use the await keyword in its body. Since you are using async functions to create the PDF and to send it to S3, your cloud function is returning before these operations are actually completed.The await keyword before a promise makes JavaScript wait until that promise settles, and then: The async keyword before a function has two effects: Description PDFKit is a PDF document generation library for Node and the browser that makes creating complex, multi-page, printable documents easy. In the case of an error, it propagates as usual, from the failed promise to Promise.all, and then becomes an exception that we can catch using try.catch around the call. PDFKit A JavaScript PDF generation library for Node and the browser.
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