WASM

It is possible to compile an application using quic-go to WASM.

Since the wasip1 API lacks support for network sockets, it’s necessary to create the UDP socket using the WASI socket extension.

import "github.com/stealthrocket/net/wasip1"

conn, err := wasip1.ListenPacket("udp", "127.0.0.1:443")
// ... handle error ...
ln, err := quic.Listen(conn, <tls.Config>, <quic.Config>)

Note that wasip1.ListenPacket returns a net.PacketConn, not a *net.UDPConn, which means that quic-go won’t be able to use optimizations like GSO or ECN.

The code can then be compiled to wasm and run using wasirun:

GOOS=wasip1 GOARCH=wasm go build -o myapp
wasirun ./myapp

It is currently not possible to use wasmedge, since it doesn’t allow sending of UDP datagrams.

Limitations

It is not possible to use convenience functions like quic.ListenAddr and quic.DialAddr, since these functions create the UDP socket using the standard library net package.

📝 Future Work

• Improve WASM support: #4524