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quic-go/testutils/simnet
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Marten Seemann 7772755df2 add simnet package to simulate a net.PacketConn in memory (#5385) 
* Implement simnet

* simnet: remove separate license

* simnet: remove go.mod, use standard require package

* simnet: add README

* simnet: use synctest wrapper in tests

* simnet: minor code cleanup

* simnet: expose Packet.Data

* simnet: explose Simnet.Router

* simnet: remove SimpleFirewallRouter

* simnet: remove stray fmt.Println in tests

* fix deadline check for write deadlines

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* simnet: fix SetReadDeadline logic

---------

Co-authored-by: Marco Munizaga <git@marcopolo.io>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
2025-10-18 09:19:46 +02:00
..
packetq_test.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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packetq.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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README.md
add simnet package to simulate a net.PacketConn in memory (#5385)
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router.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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simconn_test.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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simconn.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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simlink_test.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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simlink.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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simnet_synctest_test.go
add simnet package to simulate a net.PacketConn in memory (#5385)
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simnet.go
add simnet package to simulate a net.PacketConn in memory (#5385)
2025-10-18 09:19:46 +02:00

README.md

simnet

This package is based on @MarcoPolo's simnet package.

A small Go library for simulating packet networks in-process. It provides drop-in net.PacketConn endpoints connected through configurable virtual links with bandwidth, latency, and MTU constraints. Useful for testing networking code without sockets or root privileges.

  • Drop-in API: implements net.PacketConn
  • Realistic links: per-direction bandwidth, latency, and MTU
  • Backpressure/buffering: bandwidth–delay product aware queues
  • Routers: perfect delivery, fixed-latency, simple firewall/NAT-like routing
  • Deterministic testing: opt-in synctest-based tests for time control
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