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#!/usr/bin/env node
/**
* Script to translate a minified stack trace to a real one.
*
* Usage:
* stacktrace-translate
*
* Paste stacktrace array from error log into stdin.
*/
const fs = require( 'fs' );
const readline = require( 'readline' );
const glob = require( 'glob' );
const _ = require( 'lodash' );
const SourceMap = require( 'source-map' );
const StackFrame = require( 'stackframe' );
const StackTraceGPS = require( 'stacktrace-gps' );
const BUNDLE_URL_ROOT = 'https://wordpress.com/calypso/';
const SOURCE_PATTERN = './public/*.js';
const SOURCEMAP_PATTERN = './public/*.js.map';
let verbose = false;
function loadSources() {
const filePrefixChars = SOURCE_PATTERN.indexOf( '*' );
const fileNames = glob.sync( SOURCE_PATTERN );
const files = {};
fileNames.forEach( ( fileName ) => {
const relativeFileName = fileName.substring( filePrefixChars );
const url = BUNDLE_URL_ROOT + relativeFileName;
const text = fs.readFileSync( fileName );
const textWithMapping = text + '\n//# sourceMappingURL=' + url + '.map';
files[ url ] = textWithMapping;
} );
return files;
}
function loadSourceMaps() {
const filePrefixChars = SOURCEMAP_PATTERN.indexOf( '*' );
const fileNames = glob.sync( SOURCEMAP_PATTERN );
const files = {};
fileNames.forEach( ( fileName ) => {
const url = BUNDLE_URL_ROOT + fileName.substring( filePrefixChars );
const text = fs.readFileSync( fileName );
const data = JSON.parse( text );
files[ url ] = new SourceMap.SourceMapConsumer( data );
} );
return files;
}
function readStackTraceText( text, sourceCache, sourceMapConsumerCache ) {
const originalStack = JSON.parse( text );
const gps = new StackTraceGPS( { offline: true, sourceCache, sourceMapConsumerCache } );
originalStack.forEach( ( originalStackFrame, index ) => {
const stackFrame = new StackFrame( {
fileName: originalStackFrame.url,
lineNumber: originalStackFrame.line,
columnNumber: originalStackFrame.column,
} );
gps.getMappedLocation( stackFrame ).then( ( mappedStackFrame ) => {
printStackFrame( originalStackFrame, mappedStackFrame, index );
} );
} );
}
function printStackFrame( minified, mapped, index ) {
console.log( '------------------------------------------------------------' );
console.log( ' Stack Frame [ ' + index + ' ]' );
console.log( '------------------------------------------------------------' );
console.log( ' minified source: \t' + minified.url );
console.log( ' function: \t' + minified.func );
console.log( ' args: \t' + JSON.stringify( minified.args ) );
console.log( ' location: \t' + minified.line + ':' + minified.column );
console.log( '' );
console.log( ' translated source: \t' + mapped.fileName );
console.log( ' function: \t' + mapped.functionName );
console.log( ' location: \t' + mapped.lineNumber + ':' + mapped.columnNumber );
console.log( '' );
}
function loadBuild() {
if ( verbose ) {
console.log( 'Loading sources and maps...' );
}
const sources = loadSources();
const sourceMaps = loadSourceMaps();
if ( verbose ) {
console.log(
Object.keys( sources ).length +
' sources and ' +
Object.keys( sourceMaps ).length +
' maps loaded.'
);
}
return {
sources,
sourceMaps,
};
}
function readFromFile( fileName ) {
const { sources, sourceMaps } = loadBuild();
if ( verbose ) {
console.log( 'Reading from file: ' + fileName );
}
const text = String( fs.readFileSync( fileName ) );
readStackTraceText( text, sources, sourceMaps );
}
function readFromStdin() {
const { sources, sourceMaps } = loadBuild();
const rl = readline.createInterface( {
input: process.stdin,
output: process.stdout,
terminal: true,
prompt: '',
} );
if ( verbose ) {
console.log( 'Paste stacktrace array from error log: ' );
}
rl.on( 'line', ( line ) => {
readStackTraceText( line, sources, sourceMaps );
rl.close();
} );
}
function showUsage() {
console.log( 'Usage: stacktrace-translate.js [options] <json file>' );
console.log( '' );
console.log( '<json file>: Stack trace file (if not provided stdin will be used.)' );
console.log( '' );
console.log( 'Options:' );
console.log( ' -?, --help\t\t\tShow usage' );
console.log( ' -v, --verbose\t\t\tVerbose output' );
}
function run( args ) {
const usage = _.includes( args, '-?' ) || _.includes( args, '--help' );
if ( usage ) {
showUsage( args[ 0 ], args[ 1 ] );
process.exit( 0 );
}
verbose = _.includes( args, '-v' ) || _.includes( args, '--verbose' );
const fileName = _.find( args, ( el, index ) => {
return 2 <= index && ! el.startsWith( '-' );
} );
if ( fileName ) {
readFromFile( fileName );
} else {
readFromStdin();
}
}
run( process.argv );
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