ChronoKVS: Support configuration files

[EnekoGonzalez3]

Summary

Enable ChronoKVS to load client configuration from JSON files via -c parameter, allowing connection to distributed ChronoLog deployments. All ChronoKVS programs now support both local (default) and distributed configurations.

Changes (relative to #431)

Add optional config_path parameter throughout the ChronoKVS stack with -c command-line support:

API Layer

• ChronoKVS(const std::string& config_path = "")
• ChronoKVSMapper(const std::string& config_path = "")
• ChronoKVSClientAdapter(const std::string& config_path = "")

Command-Line Support

All ChronoKVS programs now accept -c config_file parameter:

• chronokvs_integration_test [-c config_file]
• chronokvs_writer_example [-c config_file]
• chronokvs_reader_example [-c config_file]

When config_path is provided, configuration is loaded using ClientConfiguration::load_from_file(). Without -c, programs use default localhost:5555 configuration.

Usage

Default (localhost)

./chronokvs_integration_test

Distributed (with config file)

./chronokvs_integration_test -c ~/chronolog-install/chronolog/conf/default_client_conf.json

Programmatic API

// Default: localhost:5555
chronokvs::ChronoKVS kvs;

// Distributed: load from config file
chronokvs::ChronoKVS kvs("/path/to/client_conf.json");

Testing

# Inside container at ~/chronolog-install/chronolog/bin/
./chronokvs_integration_test                                      # Local mode
./chronokvs_integration_test -c ../conf/default_client_conf.json # Distributed mode

Files Modified

• chronokvs.h / chronokvs.cpp - Public API constructor
• chronokvs_mapper.h / chronokvs_mapper.cpp - Mapper layer constructor
• chronokvs_client_adapter.h / chronokvs_client_adapter.cpp - Adapter with config loading
• chronokvs_writer_example.cpp - Command-line parsing
• chronokvs_reader_example.cpp - Command-line parsing
• chronokvs_integration_test.cpp - Command-line parsing

Dependencies

• Built on top of PR ChronoKVS Plugin: Extend story handles lifetime #431 (story handle caching)

Closes #470