context metadata cleanup

[ayushman1210]

1. Added function declaration in context.h

• Added destroyContextMetadata() function declaration with documentation explaining its purpose

2. Implemented cleanup function in context.c
   Created destroyContextMetadata() that

• Iterates through the ctx.metaMap hash table using HASH_ITER macro
• Safely deletes each entry using HASH_DEL
• Frees the allocated memory for each metadata structure
• Sets ctx.metaMap to NULL after cleanup

3. Integrated cleanup into sipnet.c
   Added call to destroyContextMetadata() at the end of cleanupModel() function

Implementation Details
The implementation uses the uthash library's HASH_ITER and HASH_DEL macros for safe iteration and deletion:

• HASH_ITER safely iterates through the hash table while allowing deletion of elements
• HASH_DEL removes each element from the hash table
• free() deallocates the memory for each context_metadata structure
• Setting ctx.metaMap = NULL prevents potential use-after-free issues

Fixes

#211

[dlebauer]

Hi @ayushman1210 thank you for reporting this bug and submitting these changes.

Unfortunately, it looks like these changes. Include your updates to documentation, maybe the same as are in #203.

Could you please either take those files out of this PR or submit a new one so that the PR is focused on the related issue? Either approach would be fine.

And as a minor request, for future reference - it is helpful if you can prepend the branch name and pr title with the feature number.

[ayushman1210]

Hi @dlebauer sorry for the late response
I have updated the branch so the PR now contains only the context metadata cleanup commit (f6550f9), rebased cleanly on upstream/master.
please review this pr when you have some free time
thanks !!

[dlebauer]

Thanks @ayushman1210 - I'll defer to @Alomir for approval.

[Alomir]

Thanks for the work! One name change suggestion, but more importantly a possible way to work around the false clang error.

[ayushman1210]

hey @Alomir please review this PR when you have some free time I have made changes as you suggested
thanks !!

[ayushman1210]

Hi @Alomir ,
Just nudging this PR #225 up your inbox 🙂 – looking forward to your feedback when you get a chance.
Appreciate it!