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check-napi.js
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check-napi.js
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'use strict';
// Descend into a directory structure and, for each file matching *.node, output
// based on the imports found in the file whether it's an N-API module or not.
const fs = require('fs');
const path = require('path');
// Read the output of the command, break it into lines, and use the reducer to
// decide whether the file is an N-API module or not.
function checkFile (file, command, argv, reducer) {
const child = require('child_process').spawn(command, argv, {
stdio: ['inherit', 'pipe', 'inherit']
});
let leftover = '';
let isNapi;
child.stdout.on('data', (chunk) => {
if (isNapi === undefined) {
chunk = (leftover + chunk.toString()).split(/[\r\n]+/);
leftover = chunk.pop();
isNapi = chunk.reduce(reducer, isNapi);
if (isNapi !== undefined) {
child.kill();
}
}
});
child.on('close', (code, signal) => {
if ((code === null && signal !== null) || (code !== 0)) {
console.log(
command + ' exited with code: ' + code + ' and signal: ' + signal);
} else {
// Green if it's a N-API module, red otherwise.
console.log(
'\x1b[' + (isNapi ? '42' : '41') + 'm' +
(isNapi ? ' N-API' : 'Not N-API') +
'\x1b[0m: ' + file);
}
});
}
// Use nm -a to list symbols.
function checkFileUNIX (file) {
checkFile(file, 'nm', ['-a', file], (soFar, line) => {
if (soFar === undefined) {
line = line.match(/([0-9a-f]*)? ([a-zA-Z]) (.*$)/);
if (line[2] === 'U') {
if (/^napi/.test(line[3])) {
soFar = true;
}
}
}
return soFar;
});
}
// Use dumpbin /imports to list symbols.
function checkFileWin32 (file) {
checkFile(file, 'dumpbin', ['/imports', file], (soFar, line) => {
if (soFar === undefined) {
line = line.match(/([0-9a-f]*)? +([a-zA-Z0-9]) (.*$)/);
if (line && /^napi/.test(line[line.length - 1])) {
soFar = true;
}
}
return soFar;
});
}
// Descend into a directory structure and pass each file ending in '.node' to
// one of the above checks, depending on the OS.
function recurse (top) {
fs.readdir(top, (error, items) => {
if (error) {
throw new Error('error reading directory ' + top + ': ' + error);
}
items.forEach((item) => {
item = path.join(top, item);
fs.stat(item, ((item) => (error, stats) => {
if (error) {
throw new Error('error about ' + item + ': ' + error);
}
if (stats.isDirectory()) {
recurse(item);
} else if (/[.]node$/.test(item) &&
// Explicitly ignore files called 'nothing.node' because they are
// artefacts of node-addon-api having identified a version of
// Node.js that ships with a correct implementation of N-API.
path.basename(item) !== 'nothing.node') {
process.platform === 'win32'
? checkFileWin32(item)
: checkFileUNIX(item);
}
})(item));
});
});
}
// Start with the directory given on the command line or the current directory
// if nothing was given.
recurse(process.argv.length > 3 ? process.argv[2] : '.');