lspgn edited a comment on issue #5695: Go: Segfault on messageId serialize after getting it from producer URL: https://github.com/apache/pulsar/issues/5695#issuecomment-561059864 I created a branch with more debug: https://github.com/lspgn/pulsar/commit/7d1c0f4c2074f2240b888306822d81092042a490 https://github.com/lspgn/pulsar/commit/1373b1b884a6b6822568ca4e931445469683f72f The following C prints more information about the messageId structure: ``` static int myprint(pulsar_message_id_t* messageId) { printf(" messageId: %x\n", messageId); char *a = messageId; printf(" strlen: %d\n", strlen(a)); printf(" "); for(int i = 0; i < strlen(a);i++) { printf("0x%x ", a[i]); } printf("\n"); return strlen } ``` ``` func (m *messageID) String() string { fmt.Printf("messageID String %v\n", m.ptr) strl := int(C.myprint(m.ptr)) if strl == 4 { str := C.pulsar_message_id_str(m.ptr) defer C.free(unsafe.Pointer(str)) return C.GoString(str) } return "none" } ``` The output of this is: ``` getMessageId messageID String &{} messageId: 7811e60 strlen: 0 The message Id value is: [none] getMessageId messageID String &{} messageId: 6f002a0 strlen: 0 The message Id value is: [none] getMessageId messageID String &{} messageId: 6f002a0 strlen: 0 The message Id value is: [none] getMessageId messageID String &{} messageId: 7a086a0 strlen: 0 The message Id value is: [none] getMessageId messageID String &{} messageId: 6e014c0 strlen: 3 0xffffff9f 0x2 0x6e The message Id value is: [none] getMessageId messageID String &{} messageId: 6f02a80 strlen: 4 0xffffffb8 0x2a 0xfffffff0 0x6 The message Id value is: [(75556568,0,2433,37)] getMessageId messageID String &{} messageId: 6e00c10 strlen: 4 0xffffffc8 0x2b 0xffffffe0 0x6 The message Id value is: [(75556568,0,2433,37)] getMessageId messageID String &{} messageId: 7812940 strlen: 0 The message Id value is: [none] getMessageId messageID String &{} messageId: 6e01f40 strlen: 3 0xffffffb4 0x2 0x6e The message Id value is: [none] getMessageId messageID String &{} messageId: 7a086a0 strlen: 0 ``` It seems to only work when the length of the ID is 4 bytes. Otherwise it fails to convert to a proper ID.
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