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const fs = require( 'fs' );
const path = require( 'path' );
const chalk = require( 'chalk' );
const v8Profiler = require( 'v8-profiler-next' );
const { default: isStaticRequest } = require( 'calypso/server/lib/is-static-request' );
/**
* This should be dynamically imported:
*
* if ( shouldProfile ) {
* app.use ( require( 'calypso/server/middleware/profiler' )() )
* }
*
* to avoid importing v8-profiler-next in production environments.
*/
module.exports = () => {
console.info(
chalk.blueBright(
'\nRunning server with CPU profiler enabled. Profiles for each request are written to ./profiles\n'
)
);
// Log about request.
let isProfiling = false;
// Generates a CPU profile compatible with VS Code's viewer.
v8Profiler.setGenerateType( 1 );
const profilesRoot = path.resolve( path.join( __dirname, '../../../profiles' ) );
return ( req, res, next ) => {
// Avoid profiling certain requests (like for static files) and don't
// start profiling if we already are.
if ( isProfiling || ! req.originalUrl.startsWith( '/' ) || isStaticRequest( req ) ) {
next();
return;
}
isProfiling = true;
// Replace slash with underscore:
const profileName = req.originalUrl.replace( /\//g, '_' );
v8Profiler.startProfiling( profileName, true );
// Once the request finishes, save the profile data to a file.
res.on( 'close', () => {
isProfiling = false;
const profile = v8Profiler.stopProfiling( profileName );
profile.export( ( error, result ) => {
if ( error ) {
console.error( chalk.red( 'Something wrent wrong generating the CPU profile.' ) );
console.error( error );
return;
}
const requestProfileDir = path.join( profilesRoot, profileName );
try {
fs.accessSync( requestProfileDir );
} catch {
fs.mkdirSync( requestProfileDir, { recursive: true } );
}
const profileFileName = path.join(
requestProfileDir,
`${ profileName }-${ new Date().toISOString() }.cpuprofile`
);
fs.writeFile( profileFileName, result, ( err ) => {
if ( err ) {
console.error( chalk.red( 'Something wrent wrong writing the CPU profile file.' ) );
console.error( err );
return;
}
console.log(
chalk.blueBright( `Successfully wrote CPU profile to ${ profileFileName }` )
);
} );
} );
profile.delete();
} );
next();
};
};
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