msgpack: add utilities for msgpack

[nokute78]

This patch is to add utilities for msgapck.

• flb_msgpack_cmp_str/sds/msgpack_str
  • To check if input str/sds/msgpack_str and msgpack object are the same string.
• flb_msgpack_get_value_from_(nested)map
  • To get a value object from (nested) map. It is similar to record accessor but this API is simple.

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Enter [N/A] in the box, if an item is not applicable to your change.

Testing
Before we can approve your change; please submit the following in a comment:

• [N/A] Example configuration file for the change
• Debug log output from testing the change

• Attached Valgrind output that shows no leaks or memory corruption was found

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• [N/A] Documentation required for this feature

Backporting

• [N/A] Backport to latest stable release.

Debug/Valgrind output

$ valgrind --leak-check=full bin/flb-it-msgpack
==85010== Memcheck, a memory error detector
==85010== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==85010== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==85010== Command: bin/flb-it-msgpack
==85010== 
Test flb_msgpack_cmp_str_len...                 [ OK ]
==85010== Warning: invalid file descriptor -1 in syscall close()
Test flb_msgpack_cmp_str...                     [ OK ]
==85010== Warning: invalid file descriptor -1 in syscall close()
Test flb_msgpack_cmp_sds...                     [ OK ]
==85010== Warning: invalid file descriptor -1 in syscall close()
Test flb_msgpack_cmp_msgpack_str...             [ OK ]
==85010== Warning: invalid file descriptor -1 in syscall close()
Test flb_msgpack_get_value_from_map...          [ OK ]
==85010== Warning: invalid file descriptor -1 in syscall close()
Test flb_msgpack_get_value_from_nested_map...   [ OK ]
==85010== Warning: invalid file descriptor -1 in syscall close()
SUCCESS: All unit tests have passed.
==85010== 
==85010== HEAP SUMMARY:
==85010==     in use at exit: 0 bytes in 0 blocks
==85010==   total heap usage: 5,174 allocs, 5,174 frees, 1,068,198 bytes allocated
==85010== 
==85010== All heap blocks were freed -- no leaks are possible
==85010== 
==85010== For lists of detected and suppressed errors, rerun with: -s
==85010== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

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[github-actions]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.