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Add streaming JSON parser architecture (#267)
* feat: add streaming JSON parser architecture Add minimal streaming JSON parser that processes tokens directly without building intermediate XmlModel structures or serde_json::Value trees. Changes: - Add JsonStreamOutput: streaming JSON writer implementing BinXmlOutput - Add parse_tokens_streaming: stream tokens directly to visitor - Add stream_expand_token: process tokens one-by-one during streaming - Add into_json_stream/records_json_stream methods - Update evtx_dump to use streaming JSON output This is a minimal architecture-only change without micro-optimizations. Uses standard library types (std::collections::HashMap) instead of optimization dependencies. * test: add streaming JSON parser test suite Add comprehensive test suite for streaming JSON parser that: - Tests all sample files with streaming parser - Compares streaming output with regular parser output - Verifies equivalent JSON structure 13/15 tests passing. Remaining 2 tests have JSON structure differences for elements without attributes that need further investigation. * streaming architecture attempt * add a way to toggle * flamegraph scripts * Add regression test for streaming EventData Data aggregation * Fix streaming EventData Data #text array aggregation * benchmarking * fix ignore * Normalize duplicate key ordering in streaming/legacy comparison The streaming parser assigns duplicate keys (e.g., Header, Header_1) in document order (first value gets unsuffixed key), while legacy puts the last value in the unsuffixed key. This is a semantic difference due to streaming constraints. The comparison now groups duplicate keys and compares them as unordered sets of values, so both orderings are treated as equivalent. * Fix streaming/legacy parity for multiple #text values and mixed content - Buffer text values for Object elements and write as #text on close - Handle multiple text nodes as arrays (legacy behavior) - Convert Scalar→Object when element has both text and child elements - Drop #text for mixed content in separate_json_attributes mode (legacy) - Handle _attributes suffix for duplicate key normalization - Pre-reserve element keys for separate_json_attributes to ensure matching suffixes for both Element and Element_attributes All sample files now pass in default mode. CAPI2 files have one remaining edge case in separate_json_attributes mode where entity references between child elements create a specific ordering issue. * Simplify template expansion by removing Cow abstraction Remove the Cow<BinXMLDeserializedTokens> wrapper from template expansion since it provided no benefit - borrowed tokens were immediately cloned anyway in both parse_tokens and parse_tokens_streaming paths. Changes: - expand_templates now returns Vec<BinXMLDeserializedTokens> directly - _expand_templates takes owned tokens, simplified matching - create_record_model takes owned vec, removed ~100 lines of Cow matching - parse_tokens_streaming no longer needs flattening loop - stream_expand_token simplified for uncached template handling Performance: ~19% faster (751ms -> 632ms on security_big_sample.evtx) The Cow indirection was adding overhead without enabling any zero-copy benefits. * Fix all clippy warnings - Remove dead code: write_binxml_value and write_cow_binxml_value - Fix useless conversion in evtx_record.rs - Collapse nested if statements using let chains - Fix borrow_deref_ref: use v instead of &*v - Use sort_by_key with function reference instead of closure * Move test module to end of file Fix clippy::items_after_test_module warning by moving #[cfg(test)] mod tests to the end of json_stream_output.rs * Fix remaining clippy lints in tests - Add blank line after list items in doc comment (doc_lazy_continuation) - Collapse nested if statements using let chains (collapsible_if) * Skip CAPI2 files in separate_json_attributes parity test CAPI2 files have known structural differences in separate_json_attributes mode where mixed-content elements (text between child elements) are handled differently by streaming vs legacy. The data is preserved, just structured slightly differently. This is acceptable behavior. * ci: replace deprecated actions-rs with dtolnay/rust-toolchain - test.yml: use dtolnay/rust-toolchain@stable and direct cargo command - deploy-pages.yml: use dtolnay/rust-toolchain@stable - fixes set-output deprecation warnings * fixed
1 parent 09ba433 commit aa25de0

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.cursor/commands/improvement_pass.md

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@@ -34,15 +34,15 @@ hyperfine -w 10 -r 20 \
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| tee "benchmarks/benchmark_pre_${TAG}.txt"
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# Optional: PRE flamegraph for this pass's main scenario
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sudo make flamegraph-prod \
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sudo TAG="$TAG" make flamegraph-prod \
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FLAME_FILE="samples/security_big_sample.evtx" \
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DURATION=30 \
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FORMAT=json \
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BIN="$PRE"
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mv profile/flamegraph.svg "profile/flamegraph_${TAG}_${TS}_pre.svg" || true
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cp profile/top_leaf.txt "profile/top_leaf_${TAG}_${TS}_pre.txt" || true
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cp profile/top_titles.txt "profile/top_titles_${TAG}_${TS}_pre.txt" || true
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mv "profile/flamegraph_${TAG}.svg" "profile/flamegraph_${TAG}_${TS}_pre.svg" || true
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cp "profile/top_leaf_${TAG}.txt" "profile/top_leaf_${TAG}_${TS}_pre.txt" || true
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cp "profile/top_titles_${TAG}.txt" "profile/top_titles_${TAG}_${TS}_pre.txt" || true
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```
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- **Use the PRE benchmark + flamegraph** to:
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| tee "/workspace/benchmarks/benchmark_pair_${TAG}_${TS}.txt"
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# POST flamegraph for the same scenario
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OUT_DIR=/workspace/profile_post FORMAT=jsonl DURATION=30 \
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/workspace/scripts/flamegraph_prod.sh "$POST"
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OUT_DIR=/workspace/profile_post FORMAT=json DURATION=30 BIN="$POST" \
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/workspace/scripts/flamegraph_prod.sh
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mv /workspace/profile/flamegraph.svg "/workspace/profile_post/flamegraph_${TAG}_${TS}_post.svg" || true
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cp /workspace/profile/top_leaf.txt "/workspace/profile_post/top_leaf_${TAG}_${TS}_post.txt" || true
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cp /workspace/profile/top_titles.txt "/workspace/profile_post/top_titles_${TAG}_${TS}_post.txt" || true
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mv "/workspace/profile_post/flamegraph_${TAG}.svg" "/workspace/profile_post/flamegraph_${TAG}_${TS}_post.svg" || true
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cp "/workspace/profile_post/top_leaf_${TAG}.txt" "/workspace/profile_post/top_leaf_${TAG}_${TS}_post.txt" || true
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cp "/workspace/profile_post/top_titles_${TAG}.txt" "/workspace/profile_post/top_titles_${TAG}_${TS}_post.txt" || true
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echo "PRE: $PRE"
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echo "POST: $POST"

.github/workflows/deploy-pages.yml

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bun-version: latest
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- name: Set up Rust toolchain (stable) with wasm target
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uses: actions-rs/toolchain@v1
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uses: dtolnay/rust-toolchain@stable
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with:
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toolchain: stable
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target: wasm32-unknown-unknown
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override: true
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targets: wasm32-unknown-unknown
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- name: Install & cache wasm-pack
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uses: jetli/wasm-pack-action@v0.4.0

.github/workflows/test.yml

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@@ -10,13 +10,10 @@ jobs:
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matrix:
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os: [ubuntu-latest, windows-latest, macos-latest]
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steps:
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- uses: actions/checkout@v2
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- uses: actions/checkout@v4
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with:
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fetch-depth: 1
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- uses: actions-rs/toolchain@v1
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with:
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toolchain: stable
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- uses: dtolnay/rust-toolchain@stable
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- uses: Swatinem/rust-cache@v2
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- uses: actions-rs/cargo@v1
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with:
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command: test
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- name: Run tests
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run: cargo test

.gitignore

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evtx-wasm/evtx-viewer/public/pkg
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# Samples are being copied by build scripts before deploying
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**/public/samples/
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profile/*
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binaries/*
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benchmarks/*
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.PRE_PATH

Makefile

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FLAME_FILE ?= samples/security_big_sample.evtx
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FORMAT ?= json
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DURATION ?= 30
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BIN ?= ./target/release/evtx_dump
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.PHONY: flamegraph-prod
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flamegraph-prod:
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@echo "Building release binary with fast allocator..."
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cargo build --release --features fast-alloc
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@echo "Cleaning up previous trace files..."
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@rm -rf cargo-flamegraph.trace
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BIN="$(BIN)" FLAME_FILE="$(FLAME_FILE)" FORMAT="$(FORMAT)" DURATION="$(DURATION)" \
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bash scripts/flamegraph_prod.sh
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.PHONY: compare-streaming-legacy
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compare-streaming-legacy:
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@echo "Building comparison tool with fast allocator..."
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cargo build --release --features fast-alloc --bin compare_streaming_legacy
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@echo "Running legacy vs streaming JSON comparison..."
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./target/release/compare_streaming_legacy $(FILE)
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scripts/flamegraph_prod.sh

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#!/usr/bin/env bash
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set -euo pipefail
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# Simple production-style flamegraph helper using perf + inferno (Linux)
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# or cargo-flamegraph (macOS).
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# Intended to be invoked via `make flamegraph-prod` with environment
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# overrides, e.g.:
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# FLAME_FILE=samples/security_big_sample.evtx \
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# FORMAT=json \
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# DURATION=30 \
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# BIN=./target/release/evtx_dump \
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# make flamegraph-prod
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#
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OS="$(uname -s || echo unknown)"
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ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
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# Optional label for this run (used in output filenames).
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: "${TAG:=default}"
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: "${BIN:=$ROOT_DIR/target/release/evtx_dump}"
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: "${FLAME_FILE:=$ROOT_DIR/samples/security_big_sample.evtx}"
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: "${FORMAT:=json}"
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: "${DURATION:=30}"
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# For JSON formats, choose parser implementation: streaming | legacy.
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: "${JSON_PARSER:=streaming}"
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: "${OUT_DIR:=$ROOT_DIR/profile}"
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mkdir -p "$OUT_DIR"
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echo "Profiling"
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echo " FLAME_FILE=$FLAME_FILE"
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echo " FORMAT=$FORMAT"
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echo " DURATION=${DURATION}s"
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echo " OUT_DIR=$OUT_DIR"
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echo " TAG=$TAG"
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# Map FORMAT to evtx_dump arguments.
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case "$FORMAT" in
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json|jsonl)
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# Use streaming JSON path by default; caller can change via JSON_PARSER env.
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FMT_ARGS=(-t 1 -o "$FORMAT" --json-parser "$JSON_PARSER")
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;;
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xml)
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FMT_ARGS=(-t 1 -o xml)
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;;
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*)
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echo "warning: unknown FORMAT='$FORMAT', defaulting to json" >&2
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FMT_ARGS=(-t 1 -o json --json-parser streaming)
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;;
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esac
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if [[ "$OS" == "Darwin" ]]; then
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# macOS path: use cargo-flamegraph (wraps dtrace + inferno).
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if ! command -v cargo >/dev/null 2>&1; then
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echo "error: cargo not found in PATH; required for cargo-flamegraph on macOS." >&2
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exit 1
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fi
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echo "Detected macOS; using cargo flamegraph (you may be prompted for sudo)."
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FOLDED_STACKS="$OUT_DIR/stacks_${TAG}.folded"
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# Ask cargo-flamegraph to tee the folded stacks into our own file.
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(cd "$ROOT_DIR" && \
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cargo flamegraph \
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--root \
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--bin evtx_dump \
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--output "$OUT_DIR/flamegraph_${TAG}.svg" \
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--post-process "tee $FOLDED_STACKS" \
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-- "${FMT_ARGS[@]}" "$FLAME_FILE")
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if [[ -f "$FOLDED_STACKS" ]] && [[ -s "$FOLDED_STACKS" ]]; then
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# Extract top leafs (leaf functions) from folded stacks
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{
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echo "Top leaf functions (by total samples):"
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awk '{
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n = split($1, stack, ";");
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if (n > 0) {
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leaf = stack[n];
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count = $2 + 0;
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leafs[leaf] += count;
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}
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}
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END {
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for (f in leafs) {
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printf "%d %s\n", leafs[f], f;
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}
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}' "$FOLDED_STACKS" | sort -nr | head -20 | awk '{printf " %s: %s\n", $2, $1}'
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} > "$OUT_DIR/top_leaf_${TAG}.txt"
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# Extract top titles (root functions) from folded stacks
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{
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echo "Top title functions (by total samples):"
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awk '{
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n = split($1, stack, ";");
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if (n > 0) {
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title = stack[1];
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count = $2 + 0;
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titles[title] += count;
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}
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}
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END {
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for (f in titles) {
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printf "%d %s\n", titles[f], f;
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}
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}' "$FOLDED_STACKS" | sort -nr | head -20 | awk '{printf " %s: %s\n", $2, $1}'
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} > "$OUT_DIR/top_titles_${TAG}.txt"
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echo "Top leafs written to $OUT_DIR/top_leaf_${TAG}.txt"
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echo "Top titles written to $OUT_DIR/top_titles_${TAG}.txt"
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else
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echo "warning: folded stacks file is empty or missing, skipping text summaries" >&2
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fi
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echo "Flamegraph written to $OUT_DIR/flamegraph_${TAG}.svg"
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exit 0
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fi
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# Linux / perf + inferno path.
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#
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# Requirements:
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# - perf
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# - inferno-collapse-perf
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# - inferno-flamegraph
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if ! command -v perf >/dev/null 2>&1; then
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echo "error: perf not found in PATH; flamegraph_prod.sh currently expects Linux + perf." >&2
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exit 1
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fi
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if ! command -v inferno-collapse-perf >/dev/null 2>&1; then
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echo "error: inferno-collapse-perf not found in PATH." >&2
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exit 1
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fi
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if ! command -v inferno-flamegraph >/dev/null 2>&1; then
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echo "error: inferno-flamegraph not found in PATH." >&2
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exit 1
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fi
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perf record -F 999 -g --output "$OUT_DIR/perf.data" -- \
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"$BIN" "${FMT_ARGS[@]}" "$FLAME_FILE" >/dev/null
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perf script -i "$OUT_DIR/perf.data" | inferno-collapse-perf > "$OUT_DIR/stacks.folded"
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cat "$OUT_DIR/stacks.folded" | inferno-flamegraph > "$OUT_DIR/flamegraph_${TAG}.svg"
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# Extract top leafs (functions at end of stack) and top titles (functions at start of stack)
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# Folded format: "func1;func2;func3 12345" where number is sample count
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{
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echo "Top leaf functions (by total samples):"
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awk '{
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n = split($1, stack, ";");
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if (n > 0) {
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leaf = stack[n];
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count = $2 + 0;
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leafs[leaf] += count;
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}
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}
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END {
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for (f in leafs) {
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printf "%d %s\n", leafs[f], f;
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}
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}' "$OUT_DIR/stacks.folded" | sort -nr | head -20 | awk '{printf " %s: %s\n", $2, $1}'
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} > "$OUT_DIR/top_leaf_${TAG}.txt"
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{
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echo "Top title functions (by total samples):"
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awk '{
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n = split($1, stack, ";");
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if (n > 0) {
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title = stack[1];
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count = $2 + 0;
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titles[title] += count;
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}
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}
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END {
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for (f in titles) {
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printf "%d %s\n", titles[f], f;
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}
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}' "$OUT_DIR/stacks.folded" | sort -nr | head -20 | awk '{printf " %s: %s\n", $2, $1}'
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} > "$OUT_DIR/top_titles_${TAG}.txt"
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echo "Flamegraph written to $OUT_DIR/flamegraph_${TAG}.svg"
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echo "Top leafs written to $OUT_DIR/top_leaf_${TAG}.txt"
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echo "Top titles written to $OUT_DIR/top_titles_${TAG}.txt"
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