[GitHub] nkurihar opened a new pull request #3729: fix pulsar_message_set_replication_clusters

[GitBox <gi...@apache.org>]

nkurihar opened a new pull request #3729: fix pulsar_message_set_replication_clusters
URL: https://github.com/apache/pulsar/pull/3729
 
 
   ### Motivation
   `pulsar_message_set_replication_clusters()` in `c_Message.cc` doesn't work.
   
   To catch what happens, I executed [the small test code](https://gist.github.com/nkurihar/474ddba7bf2598730bb94ebbb8442117) and saw the infinite loop and finally segmentation fault:
   ```
   c1
   1
   
   c2
   2
   
   c3
   3
   
   ?
   ?
   ;?
   ;?
   ?
   
   <
   
   x???8
   ???8
   ??8
   ?8
   8
   
   .
   .
   .
   
   Segmentation fault
   ```
   
   ### Modifications
   - Fix the type of the variable `c`: it needs to be not `const char*` but `const char**`
   - Add the third argument `size` to judge when to stop the loop
   
   ### Verifying this change
   - [ ] Make sure that the change passes the CI checks.
   
   ### Does this pull request potentially affect one of the following parts:
     - The public API: yes
   
   This PR changes the interface of `pulsar_message_set_replication_clusters()`.
   If we want to keep the back compatibility, another option is to add `NULL` to `clusters` as the last element before passing to `pulsar_message_set_replication_clusters()`, and judging when to stop the loop by null check (like `while (*c) { ... }`) in the function.
   However, I think to force users to add `NULL` as the last element is error-prone, instead adding the size argument is natural.

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