YanshuoH opened a new issue, #1026:
URL: https://github.com/apache/pulsar-client-go/issues/1026
#### Expected behavior
Multiple calls to `client.Close` should not cause panic.
#### Actual behavior
Multiple calls to `client.Close` cause panic
#### Steps to reproduce
Create a client and close twice will reproduce the bug.
eg.
```
func TestPanic(t *testing.T) {
srv := test.GetServerInfo()
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: fmt.Sprintf("pulsar://%s:%s",
srv.PulsarTestServerHost, srv.PulsarTestServerTCPPort),
})
if err != nil {
t.Fatal(err)
}
client.Close()
client.Close()
}
```
Output:
```
=== RUN TestPanic
--- FAIL: TestPanic (0.00s)
panic: close of closed channel [recovered]
panic: close of closed channel
goroutine 34 [running]:
testing.tRunner.func1.2({0x1054d1040, 0x105582c78})
/Users/hys/.gvm/gos/go1.19.3/src/testing/testing.go:1396 +0x1c8
testing.tRunner.func1()
/Users/hys/.gvm/gos/go1.19.3/src/testing/testing.go:1399 +0x378
panic({0x1054d1040, 0x105582c78})
/Users/hys/.gvm/gos/go1.19.3/src/runtime/panic.go:884 +0x204
github.com/apache/pulsar-client-go/pulsar/internal.(*connectionPool).Close(0x14000281080)
/Users/hys/.gvm/pkgsets/go1.19.5/global/pkg/mod/github.com/apache/[email protected]/pulsar/internal/connection_pool.go:128
+0x88
github.com/apache/pulsar-client-go/pulsar.(*client).Close(0x14000469960)
/Users/hys/.gvm/pkgsets/go1.19.5/global/pkg/mod/github.com/apache/[email protected]/pulsar/client_impl.go:259
+0x40
go.planetmeican.com/nerds/mq/test/close-panic_test.TestPanic(0x14000292680)
/Users/hys/Documents/dev/go-workspace/src/go.planetmeican.com/nerds/mq/test/close-panic/panic_test.go:21
+0x18c
testing.tRunner(0x14000292680, 0x10557f898)
/Users/hys/.gvm/gos/go1.19.3/src/testing/testing.go:1446 +0x10c
created by testing.(*T).Run
/Users/hys/.gvm/gos/go1.19.3/src/testing/testing.go:1493 +0x300
```
#### System configuration
**Pulsar version**: v2.10.3
**SDK version**: v0.10.0
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