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Posted to commits@pulsar.apache.org by GitBox <gi...@apache.org> on 2018/12/12 22:13:14 UTC
[GitHub] tobgu opened a new issue #3180: Go client Reader panics when
passing custom StartMessageID
tobgu opened a new issue #3180: Go client Reader panics when passing custom StartMessageID
URL: https://github.com/apache/pulsar/issues/3180
#### Expected behavior
I can pass arbitrary type implementing the `pulsar.MessageID` interface in `pulsar.ReaderOptions`when creating a Reader instance.
#### Actual behavior
When I pass a custom type the client library panics:
````
panic: interface conversion: pulsar.MessageID is mypackage.pulsarMessageID, not *pulsar.messageID
/usr/local/go/src/runtime/panic.go:513 +0x1b9
github.com/apache/pulsar/pulsar-client-go/pulsar.createReaderAsync(0xc0002229a0, 0xc0001fe29a, 0x9, 0x0, 0x0, 0xb800a0, 0xc0002fb6e0, 0xc00018dd40, 0x0, 0x0, ...)
/go/pkg/mod/github.com/apache/pulsar@v2.2.0+incompatible/pulsar-client-go/pulsar/c_reader.go:115 +0x504
github.com/apache/pulsar/pulsar-client-go/pulsar.(*client).CreateReaderAsync(0xc0002229a0, 0xc0001fe29a, 0x9, 0x0, 0x0, 0xb800a0, 0xc0002fb6e0, 0x0, 0x0, 0x0, ...)
/go/pkg/mod/github.com/apache/pulsar@v2.2.0+incompatible/pulsar-client-go/pulsar/c_client.go:220 +0x65
github.com/apache/pulsar/pulsar-client-go/pulsar.(*client).CreateReader(0xc0002229a0, 0xc0001fe29a, 0x9, 0x0, 0x0, 0xb800a0, 0xc0002fb6e0, 0x0, 0x0, 0x0, ...)
/go/pkg/mod/github.com/apache/pulsar@v2.2.0+incompatible/pulsar-client-go/pulsar/c_client.go:207 +0xca
````
The culprit is the following line:
```go
// Unchecked type assertion assuming that StartMessageID is of type *messageID
C._pulsar_client_create_reader_async(client.ptr, topic, options.StartMessageID.(*messageID).ptr,
conf, savePointer(&readerAndCallback{reader, conf, callback}))
```
#### Steps to reproduce
See above
#### System configuration
**Pulsar version**: 2.2
github.com/apache/pulsar v2.2.0+incompatible h1:i2dfg67DNdHRgdzdIiSObTb9VRavAtZStxC4YIySxAI=
github.com/apache/pulsar v2.2.0+incompatible/go.mod h1:7npmYEEu+jEeIMdpGSJwrTxUB86OW/UM5IkJCAyfl5Y=
g
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