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package sidechannel
import (
"fmt"
"io"
"net"
"strconv"
"sync"
"testing"
"github.com/stretchr/testify/require"
)
func TestRegistry(t *testing.T) {
const N = 10
registry := NewRegistry()
t.Run("waiter removed from the registry right after connection received", func(t *testing.T) {
triggerCallback := make(chan struct{})
waiter := registry.Register(func(conn net.Conn) error {
<-triggerCallback
return nil
})
defer waiter.Close()
require.Equal(t, 1, registry.waiting())
client, _ := net.Pipe()
require.NoError(t, registry.receive(waiter.id, client))
require.Equal(t, 0, registry.waiting())
close(triggerCallback)
require.NoError(t, waiter.Wait())
requireConnClosed(t, client)
})
t.Run("pull connections successfully", func(t *testing.T) {
wg := sync.WaitGroup{}
var servers []net.Conn
for i := 0; i < N; i++ {
client, server := net.Pipe()
servers = append(servers, server)
wg.Add(1)
go func(i int) {
waiter := registry.Register(func(conn net.Conn) error {
_, err := fmt.Fprintf(conn, "%d", i)
return err
})
defer waiter.Close()
require.NoError(t, registry.receive(waiter.id, client))
require.NoError(t, waiter.Wait())
requireConnClosed(t, client)
wg.Done()
}(i)
}
for i := 0; i < N; i++ {
out, err := io.ReadAll(servers[i])
require.NoError(t, err)
require.Equal(t, strconv.Itoa(i), string(out))
}
wg.Wait()
require.Equal(t, 0, registry.waiting())
})
t.Run("push connection to non-existing ID", func(t *testing.T) {
client, _ := net.Pipe()
err := registry.receive(registry.nextID+1, client)
require.EqualError(t, err, "sidechannel registry: ID not registered")
requireConnClosed(t, client)
})
t.Run("pre-maturely close the waiter", func(t *testing.T) {
waiter := registry.Register(func(conn net.Conn) error { panic("never execute") })
require.NoError(t, waiter.Close())
require.Equal(t, 0, registry.waiting())
})
}
func requireConnClosed(t *testing.T, conn net.Conn) {
one := make([]byte, 1)
_, err := conn.Read(one)
require.EqualError(t, err, "io: read/write on closed pipe")
_, err = conn.Write(one)
require.EqualError(t, err, "io: read/write on closed pipe")
}
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