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package loggerutils
import (
"context"
"testing"
"time"
"github.com/docker/docker/daemon/logger"
"gotest.tools/v3/assert"
)
func TestQueue(t *testing.T) {
q := NewMessageQueue(2)
msg := &logger.Message{Line: []byte("hello")}
ctx := context.Background()
err := q.Enqueue(ctx, msg)
assert.Check(t, err)
recv := q.Receiver()
// These pointer values should be the same
assert.Equal(t, msg, <-recv)
err = q.Enqueue(ctx, msg)
assert.Check(t, err)
err = q.Enqueue(ctx, msg)
assert.Check(t, err)
q.Close()
// We have 2 messages in the queue
// Even though this is closed, we should get a true value from dequeue twice.
assert.Equal(t, msg, <-recv)
assert.Equal(t, msg, <-recv)
// This should not block and should return false
_, more := <-recv
assert.Check(t, !more, "expected no more messages in the queue")
// Test with unbuffered
q = &MessageQueue{}
recv = q.Receiver()
chAdd := make(chan error, 1)
go func() {
chAdd <- q.Enqueue(ctx, msg)
}()
assert.Equal(t, msg, <-recv)
assert.Assert(t, <-chAdd)
ctxC, cancel := context.WithCancel(ctx)
cancel()
err = q.Enqueue(ctxC, msg)
assert.ErrorIs(t, err, context.Canceled)
// Test that blocked senders do not cause a panic on close.
// This check is useful because the underlying implementation uses channels
// with the send channel eventually getting closed when q.Close is called.
go func() {
chAdd <- q.Enqueue(ctx, msg)
}()
// Wait for enqueue to be ready (or as close to ready as it can be)
for {
q.mu.Lock()
if q.sendWaiters == 1 {
q.mu.Unlock()
break
}
q.mu.Unlock()
time.Sleep(time.Millisecond)
}
q.Close()
select {
case <-time.After(5 * time.Second):
case err := <-chAdd:
assert.ErrorIs(t, err, ErrQueueClosed)
}
// Double-close should not cause any issues
q.Close()
}
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