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Save cached config to standard directories #38

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merged 17 commits into from
Jul 14, 2017
Merged

Save cached config to standard directories #38

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9bffb32
Save cached config to standard directories
Siilwyn May 8, 2017
2b9f846
Copy env-paths module to local file
Siilwyn May 8, 2017
eaca545
Remove arrow functions
Siilwyn May 8, 2017
f11246a
Use 'user-home' module instead of native 'os.homedir'
Siilwyn May 8, 2017
dff7efb
Remove template literal
Siilwyn May 8, 2017
7e95c90
Add attribution
Siilwyn May 8, 2017
103a424
Remove unused option parameter
Siilwyn May 8, 2017
c5d1bdf
Remove env-paths from dependencies
Siilwyn May 8, 2017
ce8959a
Remove functionality other than cache path
Siilwyn May 9, 2017
5171dd9
Simplify config path retrieval
Siilwyn May 9, 2017
2830504
Rename homedir to userHome for consistency
Siilwyn May 10, 2017
9d30f74
Add unit tests for config-file
Siilwyn May 10, 2017
3ff22be
Fix space and semicolon formatting
Siilwyn May 11, 2017
819f5fa
Improve process.platform setting
Siilwyn May 11, 2017
fb42dd6
Export function and pass platform to fix Node 0.10
Siilwyn Jun 7, 2017
6730801
Add missing semicolons
Siilwyn Jun 7, 2017
fef2c76
Make charmander happy :)
Siilwyn Jun 7, 2017
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35 changes: 35 additions & 0 deletions cache-paths.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,35 @@
const homedir = require('user-home');
const path = require('path');

const env = process.env;

const macos = function (name) {
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Prefer named functions over function assignments

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Instead of taking a name, can just have 'js-v8flags' assigned as a variable at the top of file.

const library = path.join(homedir, 'Library');

return path.join(library, 'Caches', name);
};

const windows = function (name) {
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Prefer named functions over function assignments

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Instead of taking a name, can just have 'js-v8flags' assigned as a variable at the top of file.

const appData = env.LOCALAPPDATA || path.join(homedir, 'AppData', 'Local');

return path.join(appData, name, 'Cache');
};

// https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
const linux = function (name) {
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Prefer named functions over function assignments

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Instead of taking a name, can just have 'js-v8flags' assigned as a variable at the top of file.

const username = path.basename(homedir);

return path.join(env.XDG_CACHE_HOME || path.join(homedir, '.cache'), name);
};

module.exports = function (name) {
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Instead of calling this as a function, it should probably just export the proper path based on platform

if (process.platform === 'darwin') {
return macos(name);
}

if (process.platform === 'win32') {
return windows(name);
}

return linux(name);
};
13 changes: 9 additions & 4 deletions index.js
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Expand Up @@ -10,8 +10,10 @@ const execFile = require('child_process').execFile;
const env = process.env;
const user = env.LOGNAME || env.USER || env.LNAME || env.USERNAME || '';
const exclusions = ['--help'];
const cachePaths = require('./cache-paths.js');

const configfile = '.v8flags.'+process.versions.v8+'.'+crypto.createHash('md5').update(user).digest('hex')+'.json';
const configPath = cachePaths('js-v8flags');

const failureMessage = [
'Unable to cache a config file for v8flags to a your home directory',
Expand All @@ -33,10 +35,12 @@ function openConfig (cb) {
return tryOpenConfig(path.join(os.tmpdir(), configfile), cb);
}

tryOpenConfig(path.join(userHome, configfile), function (err, fd) {
if (err) return tryOpenConfig(path.join(os.tmpdir(), configfile), cb);
return cb(null, fd);
});
fs.mkdir(configPath, function () {
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Wouldn't this need to be mkdirp? By that I mean, is there a chance the multiple directory paths will need to be created?

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Good question, I'm not sure what the proper solution is here. It should only create one directory unless the user deleted a default OS directory which would probably also break other apps...

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You can definitely count on some environments not being able to make this directory. It's a crazy world out there.

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@tkellen I understand but regardless of an error or not tryOpenConfig will be called so if the directory can not be created os.tmpdir will be used. Is that enough or would using mkdirp be better in some case?

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To clarify, by "multiple" I think @phated meant nested. It doesn't seem unlikely that the user would define a nested directory in config, in which case you would either need to recreate the logic in mkdirp and loop over the directory segments to create each one, or just use mkdirp so you don't need to think about edge cases.

also, is there a reason the error isn't being handled?

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Yes I understand @phated meant nested directories. With my reply I meant that it's nested inside a default OS directory so I'm wondering if the case needs to be handled.

Regarding error handling, if for some reason we can't create the directory the next function tryOpenConfig will handle the logic of falling back to a temporary directory so that's why there is no need to handle it.

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If you handle the error (and it's not EEXIST - which you wouldn't need to worry about with mkdirp) you could avoid an extra tryOpenConfig on the configPath before attempting tmpdir, right?

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@Siilwyn Siilwyn May 9, 2017 •
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Yes that's true. Do you think using mkdirp has enough benefit: avoiding an extra tryOpenConfig in edge cases to justify including this new dependency?

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Even if it isn't worth the added dependency (not sure if so), checking the error might still be worth it.

tryOpenConfig(path.join(configPath, configfile), function (err, fd) {
if (err) return tryOpenConfig(path.join(os.tmpdir(), configfile), cb);
return cb(null, fd);
});
})
}

function tryOpenConfig (configpath, cb) {
Expand Down Expand Up @@ -131,3 +135,4 @@ module.exports = function (cb) {
};

module.exports.configfile = configfile;
module.exports.configPath = configPath;
10 changes: 7 additions & 3 deletions test.js
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Expand Up @@ -28,7 +28,7 @@ function cleanup () {
if (userHome === null) userHome = __dirname;

var files = [
path.resolve(userHome, v8flags.configfile),
path.resolve(v8flags.configPath, v8flags.configfile),
path.resolve(os.tmpdir(), v8flags.configfile),
];
files.forEach(function (file) {
Expand All @@ -47,7 +47,7 @@ describe('v8flags', function () {

it('should cache and call back with the v8 flags for the running process', function (done) {
var v8flags = require('./');
var configfile = path.resolve(require('user-home'), v8flags.configfile);
var configfile = path.resolve(v8flags.configPath, v8flags.configfile);
v8flags(function (err, flags) {
expect(flags).to.be.a('array');
expect(fs.existsSync(configfile)).to.be.true;
Expand All @@ -62,7 +62,7 @@ describe('v8flags', function () {

it('should not append the file when multiple calls happen concurrently and the config file does not yet exist', function (done) {
var v8flags = require('./');
var configfile = path.resolve(require('user-home'), v8flags.configfile);
var configfile = path.resolve(v8flags.configPath, v8flags.configfile);
async.parallel([v8flags, v8flags, v8flags], function (err, result) {
v8flags(function (err2, res) {
done();
Expand All @@ -83,7 +83,11 @@ describe('v8flags', function () {
it('should fall back to writing to a temp dir if user home is unwriteable', function (done) {
eraseHome();
env.HOME = path.join(__dirname, 'does-not-exist');
// Clear require cached modules so the modified environment variable HOME is used
delete require.cache[require.resolve('./')]
delete require.cache[require.resolve('./cache-paths.js')]
var v8flags = require('./');
v8flags.configPath = env.HOME;
var configfile = path.resolve(os.tmpdir(), v8flags.configfile);
v8flags(function (err, flags) {
expect(fs.existsSync(configfile)).to.be.true;
Expand Down