feat(mito): make use of options in RegionCreate/OpenRequest

[evenyag]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

This PR stores RegionOptions from RegionCreateRequest and RegionOpenRequest in Version. Now we can get the options users specify while creating/opening the region.

Since RegionCreateRequest and RegionOpenRequest use HashMap<String, String> to transfer options, this PR serializes the map to a JSON string and deserializes it to the RegionOptions struct. Due to the limitation of serde, we still need to special handle nested structs.

This avoid writing lots of get() and parse() like this:

greptimedb/src/store-api/src/storage/engine.rs

Lines 160 to 194 in 342cc0a

	impl From<&HashMap<String, String>> for CompactionStrategy {
	fn from(opts: &HashMap<String, String>) -> Self {
	let Some(strategy_name) = opts.get(COMPACTION_STRATEGY_KEY) else {
	return CompactionStrategy::default();
	};
	if strategy_name.eq_ignore_ascii_case(COMPACTION_STRATEGY_TWCS_VALUE) {
	let mut twcs_opts = TwcsOptions::default();
	if let Some(max_active_window_files) = opts
	.get(TWCS_MAX_ACTIVE_WINDOW_FILES_KEY)
	.and_then(|num| num.parse::<usize>().ok())
	{
	twcs_opts.max_active_window_files = max_active_window_files;
	}
	if let Some(max_inactive_window_files) = opts
	.get(TWCS_MAX_INACTIVE_WINDOW_FILES_KEY)
	.and_then(|num| num.parse::<usize>().ok())
	{
	twcs_opts.max_inactive_window_files = max_inactive_window_files;
	}
	if let Some(time_window) = opts
	.get(TWCS_TIME_WINDOW_SECONDS_KEY)
	.and_then(|num| num.parse::<i64>().ok()) && time_window > 0
	{
	twcs_opts.time_window_seconds = Some(time_window);
	}
	CompactionStrategy::Twcs(twcs_opts)
	} else {
	// unrecognized compaction strategy
	CompactionStrategy::default()
	}
	}
	}

Refactor

• Renames CompactionStrategy to CompactionOptions
• Uses Duration to store compaction time window
• Moves RegionOptions to options.rs
• Removes engine_options

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.

Refer to a related PR or issue link (optional)

• Tracking issue for implementing mito as a region engine #1869

[codecov]

Codecov Report

Merging #2436 (a49157f) into develop (342cc0a) will increase coverage by 0.04%.
Report is 4 commits behind head on develop.
The diff coverage is 97.61%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2436      +/-   ##
===========================================
+ Coverage    77.63%   77.68%   +0.04%     
===========================================
  Files          729      731       +2     
  Lines       115114   116089     +975     
===========================================
+ Hits         89374    90189     +815     
- Misses       25740    25900     +160     

[fengjiachun]

LGTM

[waynexia]

serde master