Async file download in JavaScript and Python
https://github.com/begoon/tmpz/tree/main/async-download
Goals
- Implement async file download in JavaScript and Python.
- Compare the download speed.
- Compare the order of downloads.
- Compare the error handling.
Python
poetry install poetry shell python main.py Python Results
downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip 2: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 1: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 5: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 3: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 0: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 9: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 8: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 7: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 6: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes [[10485760, 0], [10485760, 1], [10485760, 2], [10485760, 3], Exception('random exception: n=4'), [10485760, 5], [10485760, 6], [10485760, 7], [10485760, 8], [10485760, 9]] 10 files downloaded in 23.77 seconds throughput 3.79 MB/s JavaScript
deno run -A main.js or
bun main.js JavaScript results
downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip downloading http://ipv4.download.thinkbroadband.com/10MB.zip 0: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 8: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 7: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 3: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 5: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 1: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes 6: downloaded http://ipv4.download.thinkbroadband.com/10MB.zip, 10485760 bytes [ { status: "fulfilled", value: { n: 0, sz: 10485760 } }, { status: "fulfilled", value: { n: 1, sz: 10485760 } }, { status: "rejected", reason: Error: random error: n=2 at download_file (file:///Users/...[reducted].../async-download/main.ts:9:36) at file:///Users/...[reducted].../async-download/main.ts:21:54 at Array.map (<anonymous>) at main (file:///Users/...[reducted].../async-download/main.ts:21:40) at file:///Users/...[reducted].../async-download/main.ts:36:1 }, { status: "fulfilled", value: { n: 3, sz: 10485760 } }, { status: "rejected", reason: Error: random error: n=4 at download_file (file:///Users/...[reducted].../async-download/main.ts:9:36) at file:///Users/...[reducted].../async-download/main.ts:21:54 at Array.map (<anonymous>) at main (file:///Users/...[reducted].../async-download/main.ts:21:40) at file:///Users/...[reducted].../async-download/main.ts:36:1 }, { status: "fulfilled", value: { n: 5, sz: 10485760 } }, { status: "fulfilled", value: { n: 6, sz: 10485760 } }, { status: "fulfilled", value: { n: 7, sz: 10485760 } }, { status: "fulfilled", value: { n: 8, sz: 10485760 } }, { status: "rejected", reason: Error: random error: n=9 at download_file (file:///Users/...[reducted].../async-download/main.ts:9:36) at file:///Users/...[reducted].../async-download/main.ts:21:54 at Array.map (<anonymous>) at main (file:///Users/...[reducted].../async-download/main.ts:21:40) at file:///Users/...[reducted].../async-download/main.ts:36:1 } ] 10 files downloaded in 19 seconds throughput: 3.78 MB/s Conclusion
- Both Python and JavaScript download speeds are about the same.
- As a result, the order of resolved Promises in JavaScript and Async Tasks in Python is preserved.
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