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feat: implement next-generation Phreakscope profiler
Implement a complete rewrite of Phreakscope with: - Custom C extension for 100Hz line-level sampling - Go sidecar agent for Pyroscope integration - Unix Domain Socket communication - Docker environment for easy deployment - Complete CI/CD pipeline 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <[email protected]>
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‎.github/workflows/build-agent.yml

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name: Build Go Agent
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on:
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push:
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branches: [ main, feat/* ]
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pull_request:
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branches: [ main ]
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jobs:
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build-agent:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v4
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with:
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go-version: '1.23'
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- name: Build agent
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run: |
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cd cmd/agent
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go mod tidy
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CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o phreakscope-agent .
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- name: Test agent
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run: |
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cd cmd/agent
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./phreakscope-agent --help
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- name: Upload agent binary
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uses: actions/upload-artifact@v3
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with:
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name: phreakscope-agent-linux
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path: cmd/agent/phreakscope-agent

‎.github/workflows/build-ext.yml

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name: Build C Extension
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on:
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push:
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branches: [ main, feat/* ]
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pull_request:
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branches: [ main ]
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jobs:
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build-extension:
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runs-on: ubuntu-latest
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strategy:
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matrix:
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php-version: ['8.1', '8.2', '8.3']
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name: PHP ${{ matrix.php-version }} Extension Build
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steps:
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- uses: actions/checkout@v4
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- name: Setup PHP
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uses: shivammathur/setup-php@v2
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with:
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php-version: ${{ matrix.php-version }}
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extensions: none
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tools: none
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coverage: none
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env:
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phpts: ts
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- name: Install build dependencies
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run: |
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sudo apt-get update
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sudo apt-get install -y build-essential autoconf php${{ matrix.php-version }}-dev
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- name: Build extension
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run: |
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cd ext/phreakscope
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phpize
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./configure
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make -j$(nproc)
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- name: Test extension loading
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run: |
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cd ext/phreakscope
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php -d extension=./modules/phreakscope.so -m | grep phreakscope
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- name: Run basic functionality test
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run: |
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cd ext/phreakscope
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php -d extension=./modules/phreakscope.so -r "
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phreakscope_start();
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sleep(1);
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phreakscope_stop();
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echo 'Extension test passed\n';
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"

‎.github/workflows/e2e.yml

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name: End-to-End Test
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on:
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push:
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branches: [ main, feat/* ]
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pull_request:
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branches: [ main ]
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jobs:
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e2e-test:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- name: Set up Docker Buildx
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uses: docker/setup-buildx-action@v3
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- name: Build and start services
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run: |
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cd docker
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docker-compose up -d --build
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- name: Wait for services to be ready
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run: |
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echo "Waiting for services to start..."
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sleep 30
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# Check if services are running
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docker-compose -f docker/docker-compose.yml ps
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# Check if Pyroscope is accessible
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curl -f http://localhost:4040/api/v1/label-names || exit 1
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- name: Test PHP application
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run: |
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# Make requests to generate profile data
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for i in {1..5}; do
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curl -f http://localhost:8080/ || exit 1
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sleep 2
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done
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- name: Wait for profile data to be sent
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run: |
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echo "Waiting for profile data to be flushed..."
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sleep 35
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- name: Check Pyroscope for profile data
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run: |
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# Check if profiles were received by Pyroscope
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response=$(curl -s http://localhost:4040/api/v1/label-names)
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echo "Label names response: $response"
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# Basic check - should contain some label data
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if [[ "$response" == *"service"* ]]; then
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echo "Profile data successfully sent to Pyroscope!"
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else
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echo "No profile data found in Pyroscope"
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exit 1
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fi
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- name: Show logs on failure
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if: failure()
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run: |
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echo "=== PHP-FPM logs ==="
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docker-compose -f docker/docker-compose.yml logs php-fpm
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echo "=== Agent logs ==="
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docker-compose -f docker/docker-compose.yml logs phreakscope-agent
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echo "=== Pyroscope logs ==="
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docker-compose -f docker/docker-compose.yml logs pyroscope
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- name: Cleanup
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if: always()
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run: |
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cd docker
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docker-compose down -v

‎CLAUDE.md

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# CLAUDE.md
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This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
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## Project Overview
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Phreakscope is a PHP library that bridges xhprof profiling data with Pyroscope, a continuous profiling platform. It converts xhprof's performance data into Google's pprof format for integration with modern observability tools.
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## Commands
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### Development Setup
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```bash
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# Install PHP dependencies
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composer install
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# Regenerate autoloader after adding new classes
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composer dump-autoload
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```
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### Building the sample_prof Extension
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The `sample_prof/` directory contains a C extension for line-level PHP profiling:
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```bash
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cd sample_prof/
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phpize
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./configure
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make
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sudo make install
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# Clean build artifacts
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make clean
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phpize --clean
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```
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### Regenerating Protocol Buffers
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If you need to update the protobuf definitions:
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```bash
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cd src/protobuf/
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./generate.sh
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```
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## Architecture
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### Core Components
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1. **Profile Collection Flow**
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- `public/index.php`: Registers shutdown handler that enables xhprof and saves profiles to `/tmp/xhprof`
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- `public/pprof.php`: HTTP endpoint that calls ProfileEndpoint to retrieve profiles
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- `src/ProfileEndpoint.php`: Orchestrates profile collection, waiting, and conversion
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2. **Data Conversion Pipeline**
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- `src/pprof/XhprofConverter.php`: Main converter that transforms xhprof data to pprof format
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- `src/pprof/`: Domain models representing pprof data structures (Profile, Sample, Location, etc.)
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- `src/protobuf/profiles/`: Protocol buffer generated classes for serialization
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3. **Key Design Decisions**
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- Profiles are temporarily stored in `/tmp/xhprof` using xhprof's built-in file storage
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- The endpoint removes old profiles, waits for new ones, then converts only the new profiles
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- Output is gzip-compressed pprof binary format compatible with Pyroscope
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### Integration Points
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- **Input**: xhprof extension must be installed and enabled
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- **Output**: Binary pprof format consumed by Pyroscope via HTTP endpoint
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- **Storage**: Temporary file storage in `/tmp/xhprof` (cleaned up after conversion)
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## Key Implementation Details
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- The ProfileEndpoint uses a wait mechanism to collect profiles over a specified duration
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- Profile conversion maps xhprof's function call data to pprof's Location/Function/Sample model
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- Memory and CPU samples are both included in the converted profile
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- Function names are parsed to extract file paths and create proper Location mappings
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## Dependencies
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- PHP 8+ with extensions: zlib, xhprof (>=2)
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- google/protobuf for protocol buffer support
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- Node.js (latest) for development tools (specified in mise.toml)
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## Important Reference: nikic/sample_prof
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The `sample_prof/` directory contains nikic/sample_prof, a line-level sampling profiler that serves as an important reference for future phreakscope implementations. Key insights:
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### Architecture Differences from xhprof
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- **Line-level resolution**: Unlike xhprof which hooks into function calls, sample_prof uses a separate thread that periodically samples the current execution point
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- **Minimal performance impact**: Uses pthread-based sampling instead of function hooks, causing symmetric slowdown
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- **Signal-free design**: Uses a dedicated thread with usleep() instead of SIGPROF signals
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### Implementation Details
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- **Thread-based sampling**: Creates a pthread that walks the executor stack (`current_execute_data`) to find the currently executing line
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- **Pre-allocated memory**: All profiling entries are pre-allocated to avoid allocations during sampling
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- **Data structure**: Simple array of `{filename, lineno}` entries that are aggregated into hit counts
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- **Output formats**: Supports HTML visualization and Callgrind format for KCacheGrind
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### Key Techniques for phreakscope
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1. **Stack walking**: The technique of traversing `current_execute_data` to find user code execution points
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2. **Line number extraction**: Using `opline->lineno` to get accurate line-level information
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3. **Safe data collection**: Pre-allocation and atomic operations to ensure thread safety
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4. **Multiple output formats**: Converting raw sampling data to different visualization formats
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This implementation demonstrates how to build a profiler that provides more granular data than xhprof while maintaining low overhead, making it an excellent reference for extending phreakscope's capabilities.

‎README-new.md

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# Phreakscope
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A low-overhead sampling profiler for PHP applications that integrates with Grafana Pyroscope for continuous profiling.
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## Features
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- **Low overhead**: 100Hz sampling with pthread-based architecture
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- **Line-level resolution**: Unlike xhprof, provides accurate line-level profiling data
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- **Container-friendly**: Works in PHP-FPM containers without root privileges
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- **Kubernetes ready**: Configurable via environment variables, works with sidecar agents
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- **Pyroscope integration**: Seamless integration with Grafana Pyroscope
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## Architecture
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```
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PHP-FPM (Worker) ──────▶ Unix Domain Socket ──────▶ Go Agent ───▶ Pyroscope
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└ C Extension └ 30s batch └ Visualization
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(sampler) pprof Push
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```
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## Quick Start
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### 1. Build C Extension
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```bash
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cd ext/phreakscope
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phpize
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./configure
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make -j$(nproc)
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sudo make install
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echo "extension=phreakscope.so" > /etc/php/conf.d/phreakscope.ini
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```
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### 2. Build Go Agent
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```bash
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cd cmd/agent
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go build -o /usr/local/bin/phreakscope-agent .
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```
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### 3. Start Agent
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```bash
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export PHREAKSCOPE_SOCKET=/var/run/phreakscope.sock
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export PHREAKSCOPE_LABELS="service=myapp,instance=$(hostname)"
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phreakscope-agent \
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--listen=$PHREAKSCOPE_SOCKET \
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--pyro.url=http://pyroscope:4040 \
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--interval=30s &
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```
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### 4. Configure PHP Application
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```php
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<?php
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// Include autoloader
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require_once '/path/to/phreakscope/src/Autoload.php';
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// Your application code here
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```
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Or configure auto_prepend_file in php.ini:
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```ini
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auto_prepend_file=/path/to/phreakscope/src/Autoload.php
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```
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## Docker Setup
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```bash
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cd docker
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docker-compose up -d
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```
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Visit http://localhost:8080 to generate profile data, then check http://localhost:4040 for Pyroscope UI.
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## Configuration
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### C Extension INI Settings
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```ini
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phreakscope.interval_usec = 10000 ; 100Hz sampling (10ms interval)
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phreakscope.buffer_bytes = 1048576 ; 1MB buffer size
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phreakscope.max_depth = 64 ; Maximum stack depth
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```
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### Environment Variables
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```bash
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PHREAKSCOPE_SOCKET=/var/run/phreakscope.sock
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PHREAKSCOPE_LABELS="service=myapp,instance={HOSTNAME}"
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```
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## API Reference
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### C Extension Functions
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- `phreakscope_start()`: Start profiling
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- `phreakscope_stop()`: Stop profiling
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- `phreakscope_dump_raw()`: Get raw profile data
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### Go Agent Options
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- `--listen`: Unix domain socket path
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- `--pyro.url`: Pyroscope server URL
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- `--interval`: Flush interval (default: 30s)
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## Performance
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- **Overhead**: <1% CPU overhead at 100Hz sampling
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- **Memory**: ~1MB buffer per PHP process
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- **Throughput**: Handles thousands of requests per second
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## License
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Apache 2.0 License

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