v/vlib/net/udp_test.v

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import net
import time
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fn echo_server(mut c net.UdpConn) {
mut count := 0
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for {
eprintln('> echo_server loop count: $count')
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mut buf := []u8{len: 100}
read, addr := c.read(mut buf) or { continue }
eprintln('Server got addr $addr, read: $read | buf: $buf')
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c.write_to(addr, buf[..read]) or {
println('Server: connection dropped')
return
}
count++
// Normally, after responding, the test will end, but there are sometimes cases,
// when the echo_server continued looping, printing messages constantly.
// The sleep here, is a small precaution against spamming the CI with log messages,
// when there are network problems, and it allows easier root cause diagnostic, when
// they do happen:
time.sleep(1000 * time.millisecond)
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}
}
const server_addr = '127.0.0.1:40003'
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fn echo() ? {
mut c := net.dial_udp(server_addr) or { panic('could not net.dial_udp: $err') }
defer {
c.close() or {}
}
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data := 'Hello from vlib/net!'
c.write_string(data) or { panic('could not write_string: $err') }
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mut buf := []u8{len: 100, init: 0}
read, addr := c.read(mut buf) or { panic('could not read: $err') }
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assert read == data.len
println('Got address $addr')
// Can't test this here because loopback addresses
// are mapped to other addresses
// assert addr.str() == '127.0.0.1:30001'
for i := 0; i < read; i++ {
assert buf[i] == data[i]
}
println('Got "$buf.bytestr()"')
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c.close()?
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}
fn test_udp() {
mut l := net.listen_udp(server_addr) or { panic('could not listen_udp: $err') }
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go echo_server(mut l)
echo() or { panic('could not echo: $err') }
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l.close() or {}
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}