gas2nel
v1.0.2
Published
A library for tracking and estimating resource usage metrics.
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Gas2nel
A robust Node.js utility for tracking and estimating resource costs ("gas") during asynchronous function execution. Gas2nel monitors CPU usage, memory allocation, network I/O, and file system operations to provide realistic resource utilization metrics.
Features
- 🔍 Comprehensive resource tracking
- CPU time and percentage
- Memory usage (RSS, heap, external)
- Network bandwidth (sent/received bytes)
- File I/O operations
- 📊 Configurable metric reporting
- ⚡ Real-time resource monitoring
- 🎯 Accurate gas cost estimation
- 🔄 Event-driven architecture
- 💪 TypeScript-friendly API
Installation
npm install gas2nel
Quick Start
const Gas2nel = require('gas2nel');
// Initialize with optional configuration
const gas2nel = new Gas2nel({
include: ["metric", "report"] // Include detailed metrics and human-readable report
});
// Example async function to monitor
async function complexOperation() {
const data = await fetch('https://api.example.com/data');
await processData(data);
return 'Operation completed';
}
// Estimate gas usage
const result = await gas2nel.estimateGas(complexOperation);
console.log(result);
Configuration Options
The Gas2nel constructor accepts an options object with the following properties:
{
include: string[] // Array of additional outputs to include: "metric" and/or "report"
}
API Reference
new Gas2nel(options?)
Creates a new Gas2nel instance.
const gas2nel = new Gas2nel({
include: ["metric", "report"]
});
async estimateGas(fn, ...args)
Executes a function while monitoring resource usage and returns detailed metrics.
Parameters:
fn
: Async function to monitor...args
: Arguments to pass to the function
Returns:
{
success: boolean, // Whether the function executed successfully
data: any, // Function return value or error message
gas: number, // Estimated gas cost (0 to 1 scale)
metric?: { // Optional detailed metrics
cpuTimeMs: number,
cpuPercentage: number,
memoryRSS: number,
memoryHeapUsed: number,
memoryExternal: number,
sentBytes: number,
receivedBytes: number,
wallTimeMs: number,
fileReadBytes: number,
fileWriteBytes: number
},
report?: { // Optional human-readable report
cpuTimeMs: number,
wallTimeMs: number,
peakMemoryRSS: string,
memoryHeapUsed: string,
memoryExternal: string,
networkTransferred: string,
fileIO: string
}
}
setOptions(options)
Updates the configuration options.
gas2nel.setOptions({
include: ["report"]
});
reset()
Resets all counters (network and file I/O metrics).
gas2nel.reset();
Gas Estimation Details
Gas2nel uses a weighted combination of various metrics to estimate the total resource cost:
| Metric | Weight | Description | |--------|---------|-------------| | CPU Time | 35% | Process CPU time in milliseconds | | CPU Percentage | 20% | CPU utilization percentage | | RSS Memory | 15% | Resident Set Size memory usage | | Heap Memory | 10% | V8 heap memory usage | | External Memory | 5% | V8 external memory usage | | Network Sent | 5% | Bytes sent over network | | Network Received | 5% | Bytes received over network | | Wall Time | 5% | Total execution time |
Examples
Basic Usage
const Gas2nel = require('gas2nel');
const gas2nel = new Gas2nel();
async function example() {
// CPU-intensive operation
const result = await gas2nel.estimateGas(async () => {
let sum = 0;
for (let i = 0; i < 1000000; i++) {
sum += Math.sqrt(i);
}
return sum;
});
console.log(result);
}
Network Operations
const gas2nel = new Gas2nel({ include: ["metric"] });
const result = await gas2nel.estimateGas(async () => {
const response = await fetch('https://api.example.com/data');
return await response.json();
});
console.log(`Network usage: ${result.metric.sentBytes + result.metric.receivedBytes} bytes`);
File Operations
const gas2nel = new Gas2nel({ include: ["report"] });
const result = await gas2nel.estimateGas(async () => {
await fs.promises.writeFile('output.txt', 'Hello World');
const data = await fs.promises.readFile('output.txt');
return data.toString();
});
console.log(`File I/O: ${result.report.fileIO}`);
Error Handling
Gas2nel gracefully handles errors in monitored functions:
const result = await gas2nel.estimateGas(async () => {
throw new Error('Something went wrong');
});
console.log(result);
// {
// success: false,
// data: 'Something went wrong',
// gas: 0.023, // Resources used before error
// ...
// }
Best Practices
Reset Between Operations
gas2nel.reset(); // Clear previous metrics
Include Appropriate Metrics
// For debugging gas2nel.setOptions({ include: ["metric", "report"] }); // For production gas2nel.setOptions({}); // Minimal output
Monitor Specific Operations
// Good: Monitoring specific operation await gas2nel.estimateGas(specificOperation); // Avoid: Monitoring too much await gas2nel.estimateGas(async () => { await operation1(); await operation2(); await operation3(); });
Contributing
Contributions are welcome! Please read our Contributing Guide for details on our code of conduct and the process for submitting pull requests.
License
This project is licensed under the MIT License - see the LICENSE file for details.