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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package nat

import (
    "net"
    "testing"
    "time"
)

// This test checks that autodisc doesn't hang and returns
// consistent results when multiple goroutines call its methods
// concurrently.
func TestAutoDiscRace(t *testing.T) {
    ad := startautodisc("thing", func() Interface {
        time.Sleep(500 * time.Millisecond)
        return extIP{33, 44, 55, 66}
    })

    // Spawn a few concurrent calls to ad.ExternalIP.
    type rval struct {
        ip  net.IP
        err error
    }
    results := make(chan rval, 50)
    for i := 0; i < cap(results); i++ {
        go func() {
            ip, err := ad.ExternalIP()
            results <- rval{ip, err}
        }()
    }

    // Check that they all return the correct result within the deadline.
    deadline := time.After(2 * time.Second)
    for i := 0; i < cap(results); i++ {
        select {
        case <-deadline:
            t.Fatal("deadline exceeded")
        case rval := <-results:
            if rval.err != nil {
                t.Errorf("result %d: unexpected error: %v", i, rval.err)
            }
            wantIP := net.IP{33, 44, 55, 66}
            if !rval.ip.Equal(wantIP) {
                t.Errorf("result %d: got IP %v, want %v", i, rval.ip, wantIP)
            }
        }
    }
}