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Video Streaming Server

NOTE: If you are looking for the setup guide, please navigate to OpenLiteSpeed Setup Guide.

OpenLiteSpeed-web-server is being used as a video-streaming-server. It has support for HTTP3/QUIC out of the box. The server is hosted on Google Cloud Platform (GCP).

Patches

To support the updation of congestion-window-eBPF-map i.e., CwndMap; changes have been made to the openlitespeed-source-code:

  1. Sets the default congestion-control-algorithm to cubic.
  2. A shared-variable is maintained in the memory, this stores the current-state of the kernel-congestion-window set by the lsquic module specifically the lsquic_cubic.c file. As well as logs the current-state of kernel-congestion-window, which is picked up during the testing.
  3. The shared-variable's value is used when a cubic-connection is reset.
  4. During each new HTTP-request, new logic is added to test the presence of the fallback-HTTP-header. If fallback-HTTP-header is present, then update the value of kernel-congestion-window inside the CwndMap using the value of the shared-variable. This logic is handled by the httpsession.cpp file.

lsquic_cubic.c patch can be found here: github.com/vsqoe/lsquic.
httpsession.c patch can be found here: github.com/vsqoe/openlitespeed.

Building the server

To build the server first run the setup-script, this sets up the project and the prerequisites (cwndebpf, libbpf, and bpftool). Afterwards, run the build-script, this builds and installs the lsws-service.