Accounting metrics reporter (#18136)

p2p/protocols/reporter_test.go

@@ -0,0 +1,77 @@
+// 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.")
+
+	//do some metrics
+	mBalanceCredit.Inc(12)
+	mBytesCredit.Inc(34)
+	mMsgDebit.Inc(9)
+
+	//give the reporter time to write the metrics to DB
+	time.Sleep(20 * time.Millisecond)
+
+	//set the metrics to nil - this effectively simulates the node having shut down...
+	mBalanceCredit = nil
+	mBytesCredit = nil
+	mMsgDebit = nil
+	//close the DB also, or we can't create a new one
+	metrics.Close()
+
+	//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() != 12 {
+		t.Fatalf("Expected counter to be %d, but is %d", 12, mBalanceCredit.Count())
+	}
+	if mBytesCredit.Count() != 34 {
+		t.Fatalf("Expected counter to be %d, but is %d", 23, mBytesCredit.Count())
+	}
+	if mMsgDebit.Count() != 9 {
+		t.Fatalf("Expected counter to be %d, but is %d", 9, mMsgDebit.Count())
+	}
+}