[network-diag] simplify ChildTableTlv generation and parsing

[abtink]

This commit updates ChildTableTlvEntry to better support the packing and parsing of child entries in a ChildTableTlv. It introduces an InitFrom() method to encode an entry directly from a Child object, and a Parse() method to extract values into a ParseInfo struct, improving modularity and simplifying usage.

Additionally, it consolidates the logic for calculating the timeout exponent and decoding it back to a timeout value directly within the ChildTableTlvEntry class. It also introduces ParseChildTable() in NetworkDiagnostic::Client to clean up the child table parsing loop.

[gemini-code-assist]

Summary of Changes

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This pull request significantly refactors the handling of ChildTableTlv entries within the network diagnostic module. By centralizing encoding and decoding logic into the ChildTableTlvEntry class and introducing a dedicated parsing function, the changes improve code modularity, simplify usage, and enhance readability for generating and interpreting child table information.

Highlights

• Refactored ChildTableTlvEntry: The ChildTableTlvEntry class was updated to centralize the logic for packing and parsing child entries, improving code organization and maintainability.
• New InitFrom() and Parse() methods: Introduced InitFrom() to encode an entry directly from a Child object and Parse() to extract values into a ParseInfo struct, enhancing modularity and simplifying usage.
• Consolidated Timeout Logic: The calculation of the timeout exponent and its decoding back to a timeout value are now handled directly within the ChildTableTlvEntry class, centralizing related functionality.
• Dedicated ParseChildTable() function: A new ParseChildTable() method was added to NetworkDiagnostic::Client to clean up and centralize child table parsing logic, making the code more readable and easier to manage.

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Changelog

• src/core/thread/network_diagnostic.cpp
  • Simplified Server::AppendChildTable by utilizing the new ChildTableTlvEntry::InitFrom method.
  • Introduced Client::ParseChildTable to encapsulate child table parsing logic.
  • Updated Client::GetNextDiagTlv to call the new Client::ParseChildTable for Tlv::kChildTable processing.
• src/core/thread/network_diagnostic.hpp
  • Added a typedef for otNetworkDiagChildTable as ChildTable.
  • Declared the new static method Client::ParseChildTable.
• src/core/thread/network_diagnostic_tlvs.cpp
  • Implemented ChildTableTlvEntry::InitFrom to initialize an entry from a Child object.
  • Implemented ChildTableTlvEntry::DetermineExponentFromTimeout to calculate the timeout exponent.
  • Implemented ChildTableTlvEntry::DetermineTimeoutFromExponent to convert an exponent back to a timeout.
  • Implemented ChildTableTlvEntry::Parse to extract values into a ParseInfo struct.
• src/core/thread/network_diagnostic_tlvs.hpp
  • Renamed ChildTableEntry to ChildTableTlvEntry to clarify its purpose.
  • Refactored ChildTableTlvEntry to include InitFrom, Parse, DetermineTimeoutFromExponent, and DetermineExponentFromTimeout methods.
  • Replaced individual getter/setter methods with the new InitFrom and Parse interface.
  • Updated internal bitfield masks and member names for clarity.
• src/core/utils/mesh_diag.cpp
  • Modified MeshDiag::ChildIterator::GetNextChildInfo to use the refactored ChildTableTlvEntry and its Parse method for retrieving child information.

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[gemini-code-assist]

Code Review

This pull request provides a good refactoring of the ChildTableTlv handling. The introduction of ChildTableTlvEntry::InitFrom() and ChildTableTlvEntry::Parse() methods effectively encapsulates the encoding and decoding logic, improving modularity. The new NetworkDiagnostic::Client::ParseChildTable() helper function further cleans up the parsing loop. The changes are well-implemented and improve code readability and maintainability.

[github-actions]

Merging #12712 into main

name	branch	text	data	bss	total
ot-cli-ftd	aa2437a	482208	860	66540	549608
	0a999ce	482240	860	66540	549640
	+/-	+32	+0	+0	+32
ot-ncp-ftd	aa2437a	448100	764	61776	510640
	0a999ce	448148	764	61776	510688
	+/-	+48	+0	+0	+48
ot-cli-mtd	aa2437a	374880	764	50972	426616
	0a999ce	374880	764	50972	426616
	+/-	+0	+0	+0	+0
ot-ncp-mtd	aa2437a	356012	764	46240	403016
	0a999ce	356012	764	46240	403016
	+/-	+0	+0	+0	+0
ot-cli-ftd-br	aa2437a	598336	868	136596	735800
	0a999ce	598368	868	136596	735832
	+/-	+32	+0	+0	+32
ot-rcp	aa2437a	63328	568	20804	84700
	0a999ce	63328	568	20804	84700
	+/-	+0	+0	+0	+0

Library files

name	branch	text	data	bss	total
libopenthread-ftd.a	aa2437a	249724	95	40319	290138
	0a999ce	249754	95	40319	290168
	+/-	+30	+0	+0	+30
libopenthread-cli-ftd.a	aa2437a	61746	0	8091	69837
	0a999ce	61746	0	8091	69837
	+/-	+0	+0	+0	+0
libopenthread-ncp-ftd.a	aa2437a	33581	0	5948	39529
	0a999ce	33581	0	5948	39529
	+/-	+0	+0	+0	+0
libopenthread-mtd.a	aa2437a	168508	0	24783	193291
	0a999ce	168590	0	24783	193373
	+/-	+82	+0	+0	+82
libopenthread-cli-mtd.a	aa2437a	41455	0	8059	49514
	0a999ce	41455	0	8059	49514
	+/-	+0	+0	+0	+0
libopenthread-ncp-mtd.a	aa2437a	25805	0	5948	31753
	0a999ce	25805	0	5948	31753
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libopenthread-ftd-br.a	aa2437a	366593	100	110335	477028
	0a999ce	366619	100	110335	477054
	+/-	+26	+0	+0	+26
libopenthread-cli-ftd-br.a	aa2437a	80953	0	8131	89084
	0a999ce	80953	0	8131	89084
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libopenthread-rcp.a	aa2437a	9944	0	5060	15004
	0a999ce	9944	0	5060	15004
	+/-	+0	+0	+0	+0
libopenthread-radio.a	aa2437a	19715	0	238	19953
	0a999ce	19715	0	238	19953
	+/-	+0	+0	+0	+0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.41%. Comparing base (aa2437a) to head (9316d8e).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12712      +/-   ##
==========================================
- Coverage   76.38%   73.41%   -2.98%     
==========================================
  Files         696      698       +2     
  Lines       93522    96388    +2866     
==========================================
- Hits        71439    70761     -678     
- Misses      22083    25627    +3544     

Files with missing lines	Coverage Δ
src/core/thread/network_diagnostic.cpp	78.63% <100.00%> (-0.37%)	⬇️
src/core/thread/network_diagnostic.hpp	81.81% <ø> (ø)
src/core/thread/network_diagnostic_tlvs.cpp	82.26% <100.00%> (+3.27%)	⬆️
src/core/thread/network_diagnostic_tlvs.hpp	97.67% <ø> (-0.61%)	⬇️
src/core/utils/mesh_diag.cpp	85.27% <100.00%> (+0.10%)	⬆️

... and 90 files with indirect coverage changes

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