feat: add simulation config #1
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- loads config options from a file and overwrites with CLI args - adds configurable log interval -change configuration file type by doing the ffg: replacing conf.json with conf.ini, updating SimulationConfig::load(...) to read the new .ini file, implementing cli_overwrite!(...) macro to reduce LOC when overwriting config values with CLI arguments
- Implements a Cli::from_config_file(...) method to load configuration options from either a default or user-provided (via command line argument) config file - Merges the Cli-s generated from the config file and the parsed command line arguments taking into account the following precedence (command line args > configuration options > default value) - deletes config.rs and the former implementation that loads configuration options into a Simulation- Config struct
- The latter allows dynamic, programmatic updates to the log level at runtime. - The replace was necessary to capture and log command line arguments and configuration options which may or may not contain specification of the log levels after parsing
- additionally reduces the LOC by implementing the overwrite_field!(...) macro and from_config_field(...) generic function. - makes the requirement of a configuration file optional, defaulting to default Cli values if no config file is provided
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##What this PR does -Adds aLoads config values from an optionalSimulationConfigstruct thatINIfile and overwrites these values if corresponding command line arguments are passed - The config file contains custom values for the simulationini [simln.conf] data_dir = "." sim_file = "sim.json" total_time= print_batch_size = 500 log_level = "info" expected_pmt_amt = 3800000 capacity_multiplier = 2 no_results = false log_interval = 60- Makes configurable thelog_intervalafter which results are logged##Related Issue(s) - Resolves#157##Update - This PR has changed to consider a standard way of handling configuration files as well as command line arguments. It currently introduces functionality to create and parse theClifrom an optionally-provided config file, to merge thisCliwith that parsed from command line arguments, and to grant precedence to the options/values in the latter. - Secondly, this PR also replaces the logging crate fromsimple_loggertoflexi_logger.flexi_loggerallows dynamic update of log levels after initialization and was required to deal with the issue described here. - Finally, documentation was updated to reflect the introduction and use of a config file. Note: There are some changes to unrelated files because of the requirement to wrap maximum width of code and comments at 120 column spaces. Thought to include them regardless following conversation from#164on maintaining width.