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Log ASAR file access to build ordering hint file

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This is a work in progress—need to make this behavior optional via a new flag.
This commit is contained in:
Ben Gotow 2015-12-22 12:20:50 -07:00
parent fda480d1aa
commit a3b6f69772
1 changed files with 21 additions and 1 deletions
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22
atom/common/lib/asar.js
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@ -203,7 +203,24 @@
// Override fs APIs. // Override fs APIs.
exports.wrapFsWithAsar = function(fs) { exports.wrapFsWithAsar = function(fs) {
var exists, existsSync, internalModuleReadFile, internalModuleStat, lstat, lstatSync, mkdir, mkdirSync, readFile, readFileSync, readdir, readdirSync, realpath, realpathSync, stat, statSync, statSyncNoException; var exists, existsSync, internalModuleReadFile, internalModuleStat, lstat, lstatSync, mkdir, mkdirSync, readFile, readFileSync, readdir, readdirSync, realpath, realpathSync, stat, statSync, statSyncNoException, logFDs, logASARAccess;
logFDs = {};
logASARAccess = function(asarPath, filePath, offset) {
if (!process.env.ELECTRON_LOG_ASAR_READS) {
return;
}
if (!logFDs[asarPath]) {
var logFilename, logPath;
const path = require('path');
logFilename = path.basename(asarPath, '.asar') + '-access-log.txt';
logPath = path.join(require('os').tmpdir(), logFilename);
logFDs[asarPath] = fs.openSync(logPath, 'a');
console.log('Logging ' + asarPath + ' access to ' + logPath);
}
fs.writeSync(logFDs[asarPath], offset + ': ' + filePath + '\n');
};
lstatSync = fs.lstatSync; lstatSync = fs.lstatSync;
fs.lstatSync = function(p) { fs.lstatSync = function(p) {
var archive, asarPath, filePath, isAsar, ref, stats; var archive, asarPath, filePath, isAsar, ref, stats;
@ -395,6 +412,7 @@
if (!(fd >= 0)) { if (!(fd >= 0)) {
return notFoundError(asarPath, filePath, callback); return notFoundError(asarPath, filePath, callback);
} }
logASARAccess(asarPath, filePath, info.offset);
return fs.read(fd, buffer, 0, info.size, info.offset, function(error) { return fs.read(fd, buffer, 0, info.size, info.offset, function(error) {
return callback(error, encoding ? buffer.toString(encoding) : buffer); return callback(error, encoding ? buffer.toString(encoding) : buffer);
}); });
@ -444,6 +462,7 @@
if (!(fd >= 0)) { if (!(fd >= 0)) {
notFoundError(asarPath, filePath); notFoundError(asarPath, filePath);
} }
logASARAccess(asarPath, filePath, info.offset);
fs.readSync(fd, buffer, 0, info.size, info.offset); fs.readSync(fd, buffer, 0, info.size, info.offset);
if (encoding) { if (encoding) {
return buffer.toString(encoding); return buffer.toString(encoding);
@ -516,6 +535,7 @@
if (!(fd >= 0)) { if (!(fd >= 0)) {
return void 0; return void 0;
} }
logASARAccess(asarPath, filePath, info.offset);
fs.readSync(fd, buffer, 0, info.size, info.offset); fs.readSync(fd, buffer, 0, info.size, info.offset);
return buffer.toString('utf8'); return buffer.toString('utf8');
}; };