47a04244ec
Add four major optimization modules to synor-vm: - scheduler.rs: Sealevel-style parallel execution scheduler with access set declarations, conflict detection, and batch scheduling for 10-100x throughput on non-conflicting transactions - tiered.rs: Multi-tier JIT compilation (Cold/Warm/Hot) with LRU caching and automatic tier promotion based on execution frequency - compression.rs: Bytecode compression using zstd (40-70% size reduction), content-defined chunking for deduplication, and delta encoding for efficient contract upgrades - speculation.rs: Speculative execution engine with hot state caching, version tracking, snapshot/rollback support for 30-70% latency reduction All modules include comprehensive test coverage (57 tests passing).
632 lines
18 KiB
Rust
632 lines
18 KiB
Rust
//! Bytecode Compression and Deduplication.
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//!
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//! Optimizes contract storage through:
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//!
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//! - **Zstd Compression**: 40-70% size reduction for WASM bytecode
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//! - **Code Deduplication**: Hash-based fragment sharing across contracts
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//! - **Delta Encoding**: Efficient storage of contract upgrades
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//!
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//! # Benefits
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//!
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//! - Reduced storage costs for deployers
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//! - Faster network sync (smaller blocks)
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//! - Lower memory footprint for node operators
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//! - Efficient contract upgrade storage
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use std::collections::HashMap;
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use std::sync::Arc;
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use parking_lot::RwLock;
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use crate::{ContractId, VmError};
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/// Compression level for bytecode storage.
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#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
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pub enum CompressionLevel {
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/// No compression.
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None,
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/// Fast compression (level 1).
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Fast,
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/// Balanced compression (level 3).
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#[default]
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Balanced,
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/// Maximum compression (level 19).
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Maximum,
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}
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impl CompressionLevel {
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/// Returns the zstd compression level.
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fn zstd_level(&self) -> i32 {
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match self {
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CompressionLevel::None => 0,
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CompressionLevel::Fast => 1,
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CompressionLevel::Balanced => 3,
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CompressionLevel::Maximum => 19,
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}
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}
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}
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/// Configuration for bytecode compression.
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#[derive(Clone, Debug)]
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pub struct CompressionConfig {
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/// Compression level.
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pub level: CompressionLevel,
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/// Enable deduplication.
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pub deduplication: bool,
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/// Minimum fragment size for deduplication (bytes).
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pub min_fragment_size: usize,
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/// Maximum fragment size (bytes).
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pub max_fragment_size: usize,
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/// Enable delta encoding for upgrades.
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pub delta_encoding: bool,
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}
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impl Default for CompressionConfig {
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fn default() -> Self {
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Self {
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level: CompressionLevel::Balanced,
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deduplication: true,
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min_fragment_size: 256,
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max_fragment_size: 16384,
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delta_encoding: true,
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}
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}
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}
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/// Compressed bytecode with metadata.
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#[derive(Clone, Debug)]
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pub struct CompressedBytecode {
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/// Original size before compression.
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pub original_size: usize,
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/// Compressed data.
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pub data: Vec<u8>,
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/// Compression ratio (compressed/original).
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pub ratio: f64,
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/// Content hash for deduplication.
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pub hash: [u8; 32],
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/// Fragment references (if deduplicated).
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pub fragments: Vec<FragmentRef>,
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}
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/// Reference to a shared code fragment.
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#[derive(Clone, Debug)]
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pub struct FragmentRef {
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/// Fragment hash.
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pub hash: [u8; 32],
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/// Offset in the original bytecode.
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pub offset: usize,
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/// Length of the fragment.
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pub length: usize,
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}
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/// A shared code fragment.
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#[derive(Clone, Debug)]
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pub struct CodeFragment {
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/// Fragment hash.
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pub hash: [u8; 32],
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/// Fragment data.
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pub data: Vec<u8>,
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/// Reference count.
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pub ref_count: u32,
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}
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/// Statistics for compression operations.
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#[derive(Clone, Debug, Default)]
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pub struct CompressionStats {
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/// Total bytes before compression.
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pub total_original: u64,
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/// Total bytes after compression.
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pub total_compressed: u64,
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/// Number of contracts compressed.
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pub contracts_compressed: u64,
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/// Number of shared fragments.
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pub shared_fragments: u64,
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/// Bytes saved through deduplication.
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pub dedup_savings: u64,
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}
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impl CompressionStats {
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/// Returns the overall compression ratio.
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pub fn compression_ratio(&self) -> f64 {
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if self.total_original == 0 {
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1.0
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} else {
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self.total_compressed as f64 / self.total_original as f64
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}
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}
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/// Returns total bytes saved.
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pub fn bytes_saved(&self) -> u64 {
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self.total_original.saturating_sub(self.total_compressed) + self.dedup_savings
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}
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}
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/// The bytecode compressor.
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pub struct BytecodeCompressor {
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/// Configuration.
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config: CompressionConfig,
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/// Shared fragment store.
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fragments: RwLock<HashMap<[u8; 32], Arc<CodeFragment>>>,
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/// Statistics.
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stats: RwLock<CompressionStats>,
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}
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impl BytecodeCompressor {
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/// Creates a new compressor with default config.
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pub fn new() -> Self {
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Self::with_config(CompressionConfig::default())
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}
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/// Creates with custom configuration.
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pub fn with_config(config: CompressionConfig) -> Self {
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Self {
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config,
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fragments: RwLock::new(HashMap::new()),
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stats: RwLock::new(CompressionStats::default()),
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}
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}
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/// Compresses bytecode.
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pub fn compress(&self, bytecode: &[u8]) -> Result<CompressedBytecode, VmError> {
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let original_size = bytecode.len();
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let hash = blake3::hash(bytecode).into();
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// Compress with zstd
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let compressed = if self.config.level != CompressionLevel::None {
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zstd::encode_all(bytecode, self.config.level.zstd_level())
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.map_err(|e| VmError::ExecutionError(format!("Compression failed: {}", e)))?
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} else {
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bytecode.to_vec()
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};
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let ratio = compressed.len() as f64 / original_size as f64;
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// Extract fragments for deduplication
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let fragments = if self.config.deduplication {
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self.extract_fragments(bytecode)
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} else {
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Vec::new()
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};
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// Update stats
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{
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let mut stats = self.stats.write();
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stats.total_original += original_size as u64;
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stats.total_compressed += compressed.len() as u64;
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stats.contracts_compressed += 1;
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}
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Ok(CompressedBytecode {
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original_size,
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data: compressed,
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ratio,
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hash,
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fragments,
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})
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}
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/// Decompresses bytecode.
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pub fn decompress(&self, compressed: &CompressedBytecode) -> Result<Vec<u8>, VmError> {
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if self.config.level == CompressionLevel::None {
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return Ok(compressed.data.clone());
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}
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zstd::decode_all(compressed.data.as_slice())
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.map_err(|e| VmError::ExecutionError(format!("Decompression failed: {}", e)))
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}
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/// Extracts reusable fragments from bytecode.
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fn extract_fragments(&self, bytecode: &[u8]) -> Vec<FragmentRef> {
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let mut fragments = Vec::new();
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// Use content-defined chunking (simplified rolling hash)
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let min_size = self.config.min_fragment_size;
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let max_size = self.config.max_fragment_size;
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if bytecode.len() < min_size {
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return fragments;
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}
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let mut offset = 0;
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while offset < bytecode.len() {
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let end = (offset + max_size).min(bytecode.len());
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let chunk_end = self.find_chunk_boundary(&bytecode[offset..end], min_size);
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let chunk = &bytecode[offset..offset + chunk_end];
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let hash: [u8; 32] = blake3::hash(chunk).into();
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// Store fragment if new, otherwise increment ref count
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let mut frags = self.fragments.write();
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use std::collections::hash_map::Entry;
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match frags.entry(hash) {
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Entry::Vacant(e) => {
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e.insert(Arc::new(CodeFragment {
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hash,
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data: chunk.to_vec(),
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ref_count: 1,
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}));
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}
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Entry::Occupied(mut e) => {
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// Increment ref count for existing fragment
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if let Some(inner) = Arc::get_mut(e.get_mut()) {
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inner.ref_count += 1;
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}
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}
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}
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fragments.push(FragmentRef {
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hash,
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offset,
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length: chunk_end,
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});
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offset += chunk_end;
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}
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// Update stats
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{
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let mut stats = self.stats.write();
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stats.shared_fragments = self.fragments.read().len() as u64;
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}
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fragments
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}
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/// Finds a chunk boundary using a simplified rolling hash.
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fn find_chunk_boundary(&self, data: &[u8], min_size: usize) -> usize {
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if data.len() <= min_size {
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return data.len();
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}
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// Use a simple pattern: look for WASM section boundaries
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// WASM sections start with a single byte ID followed by LEB128 length
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for i in min_size..data.len() {
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// Common WASM section markers
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if i > 0 && matches!(data[i - 1], 0x00 | 0x01 | 0x02 | 0x03 | 0x07 | 0x0A) {
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// Likely a section boundary
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return i;
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}
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}
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data.len()
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}
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/// Computes delta between two bytecode versions.
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pub fn compute_delta(&self, old: &[u8], new: &[u8]) -> Result<DeltaPatch, VmError> {
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if !self.config.delta_encoding {
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return Err(VmError::ExecutionError(
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"Delta encoding disabled".to_string(),
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));
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}
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// Simple delta: find common prefix/suffix
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let prefix_len = old
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.iter()
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.zip(new.iter())
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.take_while(|(a, b)| a == b)
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.count();
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let suffix_len = old
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.iter()
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.rev()
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.zip(new.iter().rev())
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.take_while(|(a, b)| a == b)
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.count();
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// Ensure suffix doesn't overlap with prefix
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let suffix_len = suffix_len.min(old.len().saturating_sub(prefix_len));
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let suffix_len = suffix_len.min(new.len().saturating_sub(prefix_len));
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let changed_start = prefix_len;
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let old_changed_end = old.len() - suffix_len;
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let new_changed_end = new.len() - suffix_len;
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let replacement = new[changed_start..new_changed_end].to_vec();
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let old_hash: [u8; 32] = blake3::hash(old).into();
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let new_hash: [u8; 32] = blake3::hash(new).into();
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Ok(DeltaPatch {
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old_hash,
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new_hash,
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prefix_len,
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suffix_len,
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removed_len: old_changed_end - changed_start,
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replacement,
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})
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}
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/// Applies a delta patch to reconstruct new bytecode.
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pub fn apply_delta(&self, old: &[u8], patch: &DeltaPatch) -> Result<Vec<u8>, VmError> {
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// Verify old hash
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let old_hash: [u8; 32] = blake3::hash(old).into();
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if old_hash != patch.old_hash {
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return Err(VmError::ExecutionError(
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"Delta patch: old hash mismatch".to_string(),
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));
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}
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let prefix = &old[..patch.prefix_len];
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let suffix_start = old.len() - patch.suffix_len;
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let suffix = &old[suffix_start..];
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let mut new = Vec::with_capacity(prefix.len() + patch.replacement.len() + suffix.len());
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new.extend_from_slice(prefix);
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new.extend_from_slice(&patch.replacement);
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new.extend_from_slice(suffix);
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// Verify new hash
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let new_hash: [u8; 32] = blake3::hash(&new).into();
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if new_hash != patch.new_hash {
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return Err(VmError::ExecutionError(
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"Delta patch: new hash mismatch".to_string(),
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));
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}
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Ok(new)
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}
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/// Returns compression statistics.
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pub fn stats(&self) -> CompressionStats {
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self.stats.read().clone()
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}
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/// Returns number of shared fragments.
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pub fn fragment_count(&self) -> usize {
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self.fragments.read().len()
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}
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/// Clears fragment cache.
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pub fn clear_fragments(&self) {
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self.fragments.write().clear();
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self.stats.write().shared_fragments = 0;
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}
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}
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impl Default for BytecodeCompressor {
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fn default() -> Self {
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Self::new()
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}
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}
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/// A delta patch between two bytecode versions.
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#[derive(Clone, Debug)]
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pub struct DeltaPatch {
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/// Hash of old bytecode.
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pub old_hash: [u8; 32],
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/// Hash of new bytecode.
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pub new_hash: [u8; 32],
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/// Length of unchanged prefix.
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pub prefix_len: usize,
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/// Length of unchanged suffix.
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pub suffix_len: usize,
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/// Length of removed section.
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pub removed_len: usize,
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/// Replacement data.
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pub replacement: Vec<u8>,
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}
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impl DeltaPatch {
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/// Returns the size of the patch.
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pub fn size(&self) -> usize {
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64 + 24 + self.replacement.len() // hashes + lengths + data
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}
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/// Returns estimated savings compared to full bytecode.
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pub fn savings(&self, new_size: usize) -> usize {
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new_size.saturating_sub(self.size())
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}
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}
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/// Compressed contract storage.
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pub struct CompressedContractStore {
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/// Compressor instance.
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compressor: BytecodeCompressor,
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/// Stored contracts.
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contracts: RwLock<HashMap<ContractId, CompressedBytecode>>,
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/// Delta patches for upgrades.
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patches: RwLock<HashMap<(ContractId, ContractId), DeltaPatch>>,
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}
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impl CompressedContractStore {
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/// Creates a new store.
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pub fn new() -> Self {
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Self::with_config(CompressionConfig::default())
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}
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/// Creates with custom configuration.
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pub fn with_config(config: CompressionConfig) -> Self {
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Self {
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compressor: BytecodeCompressor::with_config(config),
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contracts: RwLock::new(HashMap::new()),
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patches: RwLock::new(HashMap::new()),
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}
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}
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/// Stores a contract.
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pub fn store(&self, id: ContractId, bytecode: &[u8]) -> Result<CompressedBytecode, VmError> {
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let compressed = self.compressor.compress(bytecode)?;
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self.contracts.write().insert(id, compressed.clone());
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Ok(compressed)
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}
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/// Retrieves a contract.
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pub fn get(&self, id: &ContractId) -> Result<Vec<u8>, VmError> {
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let contracts = self.contracts.read();
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let compressed = contracts
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.get(id)
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.ok_or(VmError::ContractNotFound(*id))?;
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self.compressor.decompress(compressed)
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}
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/// Stores an upgrade as a delta.
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pub fn store_upgrade(
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&self,
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old_id: ContractId,
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new_id: ContractId,
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new_bytecode: &[u8],
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) -> Result<(), VmError> {
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let old_bytecode = self.get(&old_id)?;
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let patch = self.compressor.compute_delta(&old_bytecode, new_bytecode)?;
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// Store patch
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self.patches.write().insert((old_id, new_id), patch);
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// Also store full compressed for direct access
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self.store(new_id, new_bytecode)?;
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Ok(())
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}
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/// Returns store statistics.
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pub fn stats(&self) -> CompressionStats {
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self.compressor.stats()
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}
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/// Returns number of stored contracts.
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pub fn contract_count(&self) -> usize {
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self.contracts.read().len()
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}
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}
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impl Default for CompressedContractStore {
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fn default() -> Self {
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Self::new()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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fn make_contract(id: u8) -> ContractId {
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ContractId::from_bytes([id; 32])
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}
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fn sample_wasm() -> Vec<u8> {
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// Minimal WASM with some repeated content
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let mut wasm = vec![
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0x00, 0x61, 0x73, 0x6D, // WASM magic
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0x01, 0x00, 0x00, 0x00, // Version 1
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];
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// Add some padding to make it compressible
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wasm.extend(vec![0x00; 1000]);
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wasm
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}
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#[test]
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fn test_compression() {
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let compressor = BytecodeCompressor::new();
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let wasm = sample_wasm();
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let compressed = compressor.compress(&wasm).unwrap();
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assert!(compressed.ratio < 1.0); // Should be smaller
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assert_eq!(compressed.original_size, wasm.len());
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}
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#[test]
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fn test_roundtrip() {
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let compressor = BytecodeCompressor::new();
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let wasm = sample_wasm();
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let compressed = compressor.compress(&wasm).unwrap();
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let decompressed = compressor.decompress(&compressed).unwrap();
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assert_eq!(wasm, decompressed);
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}
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#[test]
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fn test_no_compression() {
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let config = CompressionConfig {
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level: CompressionLevel::None,
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..Default::default()
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};
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let compressor = BytecodeCompressor::with_config(config);
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let wasm = sample_wasm();
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let compressed = compressor.compress(&wasm).unwrap();
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assert_eq!(compressed.data.len(), wasm.len());
|
|
assert_eq!(compressed.ratio, 1.0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_delta_patch() {
|
|
let compressor = BytecodeCompressor::new();
|
|
|
|
let old = b"Hello, World!";
|
|
let new = b"Hello, Rust!";
|
|
|
|
let patch = compressor.compute_delta(old, new).unwrap();
|
|
let reconstructed = compressor.apply_delta(old, &patch).unwrap();
|
|
|
|
assert_eq!(new.as_slice(), reconstructed.as_slice());
|
|
}
|
|
|
|
#[test]
|
|
fn test_delta_savings() {
|
|
let compressor = BytecodeCompressor::new();
|
|
|
|
// Large similar bytecodes
|
|
let mut old = vec![0u8; 10000];
|
|
old[0..4].copy_from_slice(&[0x00, 0x61, 0x73, 0x6D]);
|
|
|
|
let mut new = old.clone();
|
|
new[5000..5010].copy_from_slice(&[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
|
|
|
|
let patch = compressor.compute_delta(&old, &new).unwrap();
|
|
|
|
// Patch should be much smaller than full bytecode
|
|
assert!(patch.size() < new.len() / 2);
|
|
}
|
|
|
|
#[test]
|
|
fn test_store() {
|
|
let store = CompressedContractStore::new();
|
|
let id = make_contract(1);
|
|
let wasm = sample_wasm();
|
|
|
|
store.store(id, &wasm).unwrap();
|
|
let retrieved = store.get(&id).unwrap();
|
|
|
|
assert_eq!(wasm, retrieved);
|
|
}
|
|
|
|
#[test]
|
|
fn test_stats() {
|
|
let compressor = BytecodeCompressor::new();
|
|
let wasm = sample_wasm();
|
|
|
|
compressor.compress(&wasm).unwrap();
|
|
|
|
let stats = compressor.stats();
|
|
assert_eq!(stats.contracts_compressed, 1);
|
|
assert!(stats.compression_ratio() < 1.0);
|
|
}
|
|
|
|
#[test]
|
|
fn test_compression_levels() {
|
|
let wasm = sample_wasm();
|
|
|
|
let configs = [
|
|
CompressionLevel::Fast,
|
|
CompressionLevel::Balanced,
|
|
CompressionLevel::Maximum,
|
|
];
|
|
|
|
let mut sizes = Vec::new();
|
|
for level in configs {
|
|
let config = CompressionConfig {
|
|
level,
|
|
deduplication: false,
|
|
..Default::default()
|
|
};
|
|
let compressor = BytecodeCompressor::with_config(config);
|
|
let compressed = compressor.compress(&wasm).unwrap();
|
|
sizes.push(compressed.data.len());
|
|
}
|
|
|
|
// Maximum should be smallest (or equal)
|
|
assert!(sizes[2] <= sizes[0]);
|
|
}
|
|
}
|