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// Copyright 2018 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 protocols
import (
"io/ioutil"
"os"
"path/filepath"
"testing"
"time"
"github.com/ethereum/go-ethereum/log"
)
//TestReporter tests that the metrics being collected for p2p accounting
//are being persisted and available after restart of a node.
//It simulates restarting by just recreating the DB as if the node had restarted.
func TestReporter(t *testing.T) {
//create a test directory
dir, err := ioutil.TempDir("", "reporter-test")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
//setup the metrics
log.Debug("Setting up metrics first time")
reportInterval := 5 * time.Millisecond
metrics := SetupAccountingMetrics(reportInterval, filepath.Join(dir, "test.db"))
log.Debug("Done.")
//change metrics
mBalanceCredit.Inc(12)
mBytesCredit.Inc(34)
mMsgDebit.Inc(9)
//store expected metrics
expectedBalanceCredit := mBalanceCredit.Count()
expectedBytesCredit := mBytesCredit.Count()
expectedMsgDebit := mMsgDebit.Count()
//give the reporter time to write the metrics to DB
time.Sleep(20 * time.Millisecond)
//close the DB also, or we can't create a new one
metrics.Close()
//clear the metrics - this effectively simulates the node having shut down...
mBalanceCredit.Clear()
mBytesCredit.Clear()
mMsgDebit.Clear()
//setup the metrics again
log.Debug("Setting up metrics second time")
metrics = SetupAccountingMetrics(reportInterval, filepath.Join(dir, "test.db"))
defer metrics.Close()
log.Debug("Done.")
//now check the metrics, they should have the same value as before "shutdown"
if mBalanceCredit.Count() != expectedBalanceCredit {
t.Fatalf("Expected counter to be %d, but is %d", expectedBalanceCredit, mBalanceCredit.Count())
}
if mBytesCredit.Count() != expectedBytesCredit {
t.Fatalf("Expected counter to be %d, but is %d", expectedBytesCredit, mBytesCredit.Count())
}
if mMsgDebit.Count() != expectedMsgDebit {
t.Fatalf("Expected counter to be %d, but is %d", expectedMsgDebit, mMsgDebit.Count())
}
}
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