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package network_test
import (
"context"
"errors"
"fmt"
"net"
"testing"
"time"
"collectd.org/api"
"collectd.org/network"
"github.com/google/go-cmp/cmp"
"github.com/google/go-cmp/cmp/cmpopts"
"golang.org/x/net/nettest"
)
type testPasswordLookup map[string]string
func (l testPasswordLookup) Password(user string) (string, error) {
pw, ok := l[user]
if !ok {
return "", fmt.Errorf("user %q not found", user)
}
return pw, nil
}
func TestNetwork(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
const (
username = "TestNetwork"
password = `oi5aGh7oLo0mai5oaG8zei8a`
)
conn, err := nettest.NewLocalPacketListener("udp")
if err != nil {
t.Fatal(err)
}
defer conn.Close()
ch := make(chan *api.ValueList)
go func() {
srv := &network.Server{
Conn: conn.(*net.UDPConn),
Writer: api.WriterFunc(func(_ context.Context, vl *api.ValueList) error {
ch <- vl
return nil
}),
PasswordLookup: testPasswordLookup{
username: password,
},
}
err := srv.ListenAndWrite(ctx)
if !errors.Is(err, context.Canceled) {
t.Errorf("Server.ListenAndWrite() = %v, want %v", err, context.Canceled)
}
close(ch)
}()
var want []*api.ValueList
go func() {
client, err := network.Dial(conn.LocalAddr().String(),
network.ClientOptions{
SecurityLevel: network.Encrypt,
Username: username,
Password: password,
})
if err != nil {
t.Fatal(err)
}
vl := &api.ValueList{
Identifier: api.Identifier{
Host: "example.com",
Plugin: "TestNetwork",
Type: "gauge",
},
Time: time.Unix(1588164686, 0),
Interval: 10 * time.Second,
Values: []api.Value{api.Gauge(42)},
}
for i := 0; i < 30; i++ {
if err := client.Write(ctx, vl); err != nil {
t.Errorf("client.Write() = %v", err)
break
}
want = append(want, vl.Clone())
vl.Time = vl.Time.Add(vl.Interval)
}
if err := client.Close(); err != nil {
t.Errorf("client.Close() = %v", err)
}
}()
var got []*api.ValueList
loop:
for {
select {
case vl, ok := <-ch:
if !ok {
break loop
}
got = append(got, vl)
case <-time.After(100 * time.Millisecond):
// cancel the context so the server returns.
cancel()
}
}
if diff := cmp.Diff(want, got, cmpopts.EquateEmpty()); diff != "" {
t.Errorf("sent and received value lists differ (+got/-want):\n%s", diff)
}
}
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