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// +build release
// The code in here is comprehensive as an integration
// test and is long, hence is only run before releases.
package client
import (
"bytes"
"errors"
"net"
"regexp"
"testing"
"time"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/libs/log"
)
func TestWSClientReconnectWithJitter(t *testing.T) {
n := 8
maxReconnectAttempts := 3
// Max wait time is ceil(1+0.999) + ceil(2+0.999) + ceil(4+0.999) + ceil(...) = 2 + 3 + 5 = 10s + ...
maxSleepTime := time.Second * time.Duration(((1<<uint(maxReconnectAttempts))-1)+maxReconnectAttempts)
var errNotConnected = errors.New("not connected")
clientMap := make(map[int]*WSClient)
buf := new(bytes.Buffer)
logger := log.NewTMLogger(buf)
for i := 0; i < n; i++ {
c, err := NewWS("tcp://foo", "/websocket")
require.Nil(t, err)
c.Dialer = func(string, string) (net.Conn, error) {
return nil, errNotConnected
}
c.SetLogger(logger)
c.maxReconnectAttempts = maxReconnectAttempts
// Not invoking defer c.Stop() because
// after all the reconnect attempts have been
// exhausted, c.Stop is implicitly invoked.
clientMap[i] = c
// Trigger the reconnect routine that performs exponential backoff.
go c.reconnect()
}
stopCount := 0
time.Sleep(maxSleepTime)
for key, c := range clientMap {
if !c.IsActive() {
delete(clientMap, key)
stopCount++
}
}
require.Equal(t, stopCount, n, "expecting all clients to have been stopped")
// Next we have to examine the logs to ensure that no single time was repeated
backoffDurRegexp := regexp.MustCompile(`backoff_duration=(.+)`)
matches := backoffDurRegexp.FindAll(buf.Bytes(), -1)
seenMap := make(map[string]int)
for i, match := range matches {
if origIndex, seen := seenMap[string(match)]; seen {
t.Errorf("match #%d (%q) was seen originally at log entry #%d", i, match, origIndex)
} else {
seenMap[string(match)] = i
}
}
}