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package clients
import (
"context"
"math/rand"
"testing"
"time"
"github.com/mimecast/dtail/internal/clients/connectors"
"github.com/mimecast/dtail/internal/clients/handlers"
"github.com/mimecast/dtail/internal/io/dlog"
"github.com/mimecast/dtail/internal/omode"
sshclient "github.com/mimecast/dtail/internal/ssh/client"
gossh "golang.org/x/crypto/ssh"
)
func TestNextRetryDelay(t *testing.T) {
tests := []struct {
name string
current time.Duration
want time.Duration
}{
{name: "zero uses initial", current: 0, want: initialRetryDelay},
{name: "doubles normally", current: 4 * time.Second, want: 8 * time.Second},
{name: "caps at max", current: 40 * time.Second, want: maxRetryDelay},
{name: "stays max at max", current: maxRetryDelay, want: maxRetryDelay},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if got := nextRetryDelay(tt.current); got != tt.want {
t.Fatalf("nextRetryDelay(%v) = %v, want %v", tt.current, got, tt.want)
}
})
}
}
func TestJitterRetryDelayWithinBounds(t *testing.T) {
base := 10 * time.Second
random := rand.New(rand.NewSource(1))
min := 8 * time.Second
max := 12 * time.Second
for i := 0; i < 100; i++ {
got := jitterRetryDelay(base, random)
if got < min || got > max {
t.Fatalf("jitterRetryDelay() = %v, expected between %v and %v", got, min, max)
}
}
}
func TestSleepWithContextCancellation(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
cancel()
start := time.Now()
if sleepWithContext(ctx, time.Second) {
t.Fatalf("sleepWithContext should stop when context is canceled")
}
if time.Since(start) > 100*time.Millisecond {
t.Fatalf("sleepWithContext took too long to exit on canceled context")
}
}
func TestStartConnectionReconnectsWithLatestSessionSpec(t *testing.T) {
originalLogger := dlog.Client
dlog.Client = &dlog.DLog{}
t.Cleanup(func() {
dlog.Client = originalLogger
})
first := &retryTestConnector{
server: "srv1",
handler: &retryTestHandler{},
}
second := &retryTestConnector{
server: "srv1",
handler: &retryTestHandler{},
}
originalSpec := SessionSpec{
Mode: omode.TailClient,
Files: []string{"/var/log/app.log"},
Regex: "ERROR",
}
updatedSpec := SessionSpec{
Mode: omode.TailClient,
Files: []string{"/var/log/next.log"},
Regex: "WARN",
}
sleepCalls := 0
var capturedSpec SessionSpec
client := &baseClient{
retry: true,
sessionSpec: originalSpec,
stats: &stats{
connectionsEstCh: make(chan struct{}, 1),
},
connections: []connectors.Connector{first},
connectionFactory: func(server string, _ []gossh.AuthMethod,
_ sshclient.HostKeyCallback, sessionSpec SessionSpec, _ bool) connectors.Connector {
if server != "srv1" {
t.Fatalf("unexpected reconnect server %q", server)
}
capturedSpec = sessionSpec
return second
},
}
client.sleepFn = func(context.Context, time.Duration) bool {
if sleepCalls == 0 {
sleepCalls++
client.sessionSpec = updatedSpec
return true
}
return false
}
status := client.startConnection(context.Background(), 0, first)
if status != 0 {
t.Fatalf("startConnection() status = %d, want 0", status)
}
if capturedSpec.Regex != updatedSpec.Regex || len(capturedSpec.Files) != 1 || capturedSpec.Files[0] != updatedSpec.Files[0] {
t.Fatalf("reconnect used stale session spec: got %#v want %#v", capturedSpec, updatedSpec)
}
if client.connections[0] != second {
t.Fatalf("expected retried connector to replace the original connection")
}
}
type retryTestConnector struct {
handler handlers.Handler
server string
}
func (c *retryTestConnector) Start(context.Context, context.CancelFunc, chan struct{}, chan struct{}) {
}
func (c *retryTestConnector) Server() string { return c.server }
func (c *retryTestConnector) Handler() handlers.Handler { return c.handler }
func (*retryTestConnector) SupportsQueryUpdates(time.Duration) bool { return false }
func (*retryTestConnector) ApplySessionSpec(SessionSpec, time.Duration) error { return nil }
func (*retryTestConnector) CommittedSession() (SessionSpec, uint64, bool) {
return SessionSpec{}, 0, false
}
type retryTestHandler struct{}
func (*retryTestHandler) Read([]byte) (int, error) { return 0, nil }
func (*retryTestHandler) Write(p []byte) (int, error) { return len(p), nil }
func (*retryTestHandler) Capabilities() []string { return nil }
func (*retryTestHandler) HasCapability(string) bool { return false }
func (*retryTestHandler) SendMessage(string) error { return nil }
func (*retryTestHandler) Server() string { return "srv1" }
func (*retryTestHandler) Status() int { return 0 }
func (*retryTestHandler) Shutdown() {}
func (*retryTestHandler) Done() <-chan struct{} {
done := make(chan struct{})
close(done)
return done
}
func (*retryTestHandler) WaitForCapabilities(time.Duration) bool { return false }
func (*retryTestHandler) WaitForSessionAck(time.Duration) (handlers.SessionAck, bool) {
return handlers.SessionAck{}, false
}
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