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13982 :: Pow Pow event library with builtin TCP, UDP, HTTP/1.1, WS and more (built with OpenCode)

• georgelemon (orginal) [2026-06-18T13:37:15+02:00] view original

  So, I wanted to try the open source LLM models via OpenCode GO. I decided to write a libevent-like library. The idea was to create a 100% nim implementation of an event loop that could be used for various applications (including in the WIP Supranim web framework - so ppl can choose between libevent/powpow) So, here is PowPow, providing TCP, UDP, HTTP (including HTTP over Unix Domain for IPC), file event notification, WebSocket support, plus:

  • Zero-copy file sending/streaming
  • Chunked Request Body support (useful for large file uploads)
  • Multipart support (pkg/multipart)
  • SIMD-optimized parsing and formatting for HTTP headers (pkg/nimsimd)
  • Support for mime type detection based on file extensions (pkg/mimedb)
  • TLS support (not yet available)

  Check the /examples for various examples (single/multi threaded server, streaming files, uploading files, websocket server, etc).

  • Repo: https://github.com/openpeeps/powpow
  • API Reference: https://openpeeps.github.io/powpow
  • Unit Tests: https://github.com/openpeeps/powpow/tree/main/tests

  Tested on Linux and macOS, totally untested on Windows. Expect bugs, hallucinations, weird behavior

  The results? Currently, Pow Pow is the #1 HTTP server in Web Frameworks Benchmark. All results in this benchmark ar made with wrk, and are made with connection: close header, which is more realistic for real world applications, while the multithreaded with connection: keep-alive results are also very good (200K+ req/sec on Ubuntu via GH Actions: https://github.com/openpeeps/powpow#dummy-benchmarks)

  All models available in the OpenCode GO subscription are pretty good at Nim. The most impressive is the cheapest one: DeepSeek v4 Flash, ofc. Definitely worth the price (https://opencode.ai/docs/go), specially, you can also use it via API, so you can integrate it in your own tools and scripts. Good stuff!

  Happy hacking!

  Ah, Regarding HTTP over Unix Domain, this is a feature that I also wanted to implement in the Supranim web framework, but the libevent library didn't support it. Also, Last time I checked, the std/httpclient module in Nim didn't support it either. Here is a copy of the httpclient module https://github.com/supranim/supranim/blob/main/src/supranim/support/httpclient.nim that basically allows you to make HTTP requests over Unix Domain sockets. I'm thinking to make a PR to the Nim std lib to add this feature 🥺 I know this isn't usual for a HTTP client, but it can be useful for certain use cases, especially in microservices where services can use HTTP protocol over Unix domain sockets instead.

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