feat: spv working in det

[pauldelucia]

Description by Korbit AI

What change is being made?

Introduce the spv functionality in the Dash Ecosystem with significant updates across the codebase including enhancements to FFI bindings, addition of mempool tracking capabilities, and documentation improvements.

Why are these changes being made?

These changes integrate the Simplified Payment Verification (SPV) client into the dash network FFI, enabling more robust interaction capabilities with the Dash network. Enhancements include improved library size management through Unified SDK for iOS, updated callback mechanisms for event handling, and comprehensive test suites to ensure reliability across SPV modules. This is part of an ongoing effort to improve code modularity and usability, especially for mobile platforms.

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[korbit-ai]

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[coderabbitai]

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[pauldelucia]

/korbit-review

[korbit-ai]

Review by Korbit AI

Korbit automatically attempts to detect when you fix issues in new commits.

Category	Issue	Status
	Clean up debug logging ▹ view	✅ Fix detected
	Missing context for ServiceUnavailable error ▹ view
	Debug Logging Obscures Core Logic ▹ view
	Temporary Debug Markers in Logs ▹ view	✅ Fix detected
	Inconsistent String Parameter Types ▹ view
	Inappropriate NotImplemented Error in Domain Error Type ▹ view
	Inefficient Single UTXO Lookup ▹ view
	Unused Height Parameter in Filter Header Storage ▹ view
	Sequential Lock Acquisitions ▹ view
	Unclear Block Version Change Rationale ▹ view

Files scanned

​

Due to the exceptionally large size of this PR, I've limited my review to the following files:

File Path	Reviewed
dash-spv/src/lib.rs	✅
dash-spv/src/network/pool.rs	✅
dash-spv/examples/sync_progress_demo.rs	✅
dash-spv/src/error.rs	✅
dash/src/sml/masternode_list/quorum_helpers.rs	✅
dash-spv/src/sync/terminal_block_data/mod.rs	✅
dash-spv/src/storage/mod.rs	✅
dash-spv/src/storage/disk_backend.rs	✅
dash/src/sml/llmq_type/mod.rs	✅
dash-spv/src/client/status_display.rs	✅
dash-spv/src/sync/sequential/transitions.rs	✅
dash-spv/src/storage/memory_backend.rs	✅
dash-spv/src/main.rs	✅
dash-spv/src/client/builder.rs	✅
dash-spv/src/chain/checkpoints.rs	✅
dash-spv/src/chain/reorg.rs	✅
dash-spv/src/chain/chainlock_manager.rs	✅
dash-spv/src/storage/compat.rs	✅
dash-spv/src/network/connection.rs	✅
dash-spv/src/types.rs	✅
dash-spv/src/storage/service.rs	✅
dash/src/sml/masternode_list_engine/mod.rs	✅

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[korbit-ai]

Unclear Block Version Change Rationale

Tell me more

What is the issue?

The block version determination logic contains unclear inline comments that don't explain why these specific heights trigger version changes.

Why this matters

Without understanding the rationale behind version changes at specific heights, future maintainers might modify these values incorrectly during network upgrades.

Suggested change ∙ Feature Preview

// Block version transitions based on historical network upgrades:
let version = if height == 0 {
1 // Original protocol genesis block
} else if height < 750000 {
2 // Initial block version before HD wallet upgrade
} else if height < 1700000 {
536870912 // Version bits activated after v0.12.0 fork (0x20000000)
} else {
536870912 // Maintained same version after v0.14.0 upgrade (0x20000000)
};

Provide feedback to improve future suggestions

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[korbit-ai]

Missing context for ServiceUnavailable error

Tell me more

What is the issue?

The newly added ServiceUnavailable variant lacks a description of when this error occurs, unlike other variants in the enum.

Why this matters

Without context about when this error occurs, developers will have difficulty handling this error case appropriately in their code.

Suggested change ∙ Feature Preview

/// Indicates the storage service is temporarily unavailable or cannot be reached
#[error("Storage service unavailable")]
ServiceUnavailable,

Provide feedback to improve future suggestions

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[korbit-ai]

Inappropriate NotImplemented Error in Domain Error Type

Tell me more

What is the issue?

Using NotImplemented error variant in StorageError enum is a design smell. Storage errors should represent actual storage-related failures rather than implementation status.

Why this matters

This mixes implementation details with domain errors, violating the Single Responsibility Principle. NotImplemented is a development status rather than a storage error condition.

Suggested change ∙ Feature Preview

Remove NotImplemented from StorageError and handle unimplemented features either through compile-time mechanisms like unimplemented!() macro or a separate development-specific error type.

Provide feedback to improve future suggestions

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[korbit-ai]

Inconsistent String Parameter Types

Tell me more

What is the issue?

Inconsistent string parameter types across error variants within StorageError - mixing String and &'static str.

Why this matters

Mixing string parameter types makes error handling code less predictable and requires different handling approaches for different variants.

Suggested change ∙ Feature Preview

Standardize on using String for all error variants:

#[error("Lock poisoned: {0}")]
LockPoisoned(String),

#[error("Storage service unavailable")]
ServiceUnavailable,

#[error("Not implemented: {0}")]
NotImplemented(String),

Provide feedback to improve future suggestions

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[korbit-ai]

Inefficient Single UTXO Lookup

Tell me more

What is the issue?

The get_utxo function inefficiently loads all UTXOs just to find a single one, which could significantly impact performance when dealing with a large number of UTXOs.

Why this matters

Loading the entire UTXO set into memory for each single UTXO lookup wastes resources and could cause performance bottlenecks in production environments.

Suggested change ∙ Feature Preview

Implement a direct single UTXO lookup in the inner DiskStorageManager instead of loading all UTXOs:

async fn get_utxo(&self, outpoint: &OutPoint) -> StorageResult<Option<Utxo>> {
    self.inner.get_utxo(outpoint).await
}

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[korbit-ai]

Unused Height Parameter in Filter Header Storage

Tell me more

What is the issue?

The height parameter in store_filter_header is not being used when calling store_filter_headers, which could lead to filter headers being stored at incorrect heights.

Why this matters

Without using the height parameter, the system might store filter headers at incorrect positions in the chain, potentially corrupting the filter header chain.

Suggested change ∙ Feature Preview

Pass the height to the inner implementation:

async fn store_filter_header(&mut self, header: &FilterHeader, height: u32) -> StorageResult<()> {
    self.inner.store_filter_headers_at_height(&[*header], height).await
}

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[korbit-ai]

Sequential Lock Acquisitions

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What is the issue?

Multiple sequential read locks are acquired for both height and hash maps when a single lock duration could cover both operations.

Why this matters

Sequential lock acquisitions increase lock contention and total lock hold time, potentially reducing concurrent performance.

Suggested change ∙ Feature Preview

Combine sequential read lock operations under a single lock acquisition:

let (highest_height, total_locks) = {
    let by_height = self.chain_locks_by_height.read().await;
    let by_hash = self.chain_locks_by_hash.read().await;
    (by_height.keys().max().cloned(), by_height.len())
};

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[korbit-ai]

Debug Logging Obscures Core Logic

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What is the issue?

Verbose debug logging in the middle of core business logic makes the function's primary purpose harder to understand at a glance.

Why this matters

Debug logging mixed with business logic increases cognitive load when reading the code. It obscures the main flow and makes maintenance more difficult.

Suggested change ∙ Feature Preview

Move the debug logging to a separate private method:

fn log_quorum_search(&self, llmq_type: LLMQType, quorum_hash: &QuorumHash, quorums_of_type: &HashMap<QuorumHash, QualifiedQuorumEntry>) {
    tracing::debug!(/* ... */);
    for (stored_hash, _) in quorums_of_type {
        tracing::debug!(/* ... */);
    }
}

Then call it before the actual lookup in the main function.

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[korbit-ai]

Korbit doesn't automatically review large (3000+ lines changed) pull requests such as this one. If you want me to review anyway, use /korbit-review.