Fix to #27211 - Refactor RealEnvStore methods to use libuv methods for env operations #27310

devasci · 2019-04-19T13:36:02Z

Refactored RealEnvStore::Get, Set, Query and Delete methods to use uv_os_getenv/setenv/unsetenv methods to avoid conditional OS switches.

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
commit message follows [commit guidelines]

src/node_env_var.cc

joyeecheung

Thanks for working on this! I left some comments.

src/node_env_var.cc

joyeecheung

LGTM with a nit

src/node_env_var.cc

nodejs-github-bot · 2019-04-19T18:08:06Z

CI: https://ci.nodejs.org/job/node-test-pull-request/22568/

src/node_env_var.cc

devasci · 2019-04-19T18:58:38Z

Thank you @addaleax and @joyeecheung for the review comments. i'll continue to work on these review and will push changes soon.

devasci · 2019-04-19T19:02:01Z

@addaleax could you elaborate a little more about the comment you and Joyee Cheung are discussing about changing return type to MaybeLocal?

addaleax · 2019-04-19T20:27:33Z

@devasci I don’t think it’s strictly blocking, because nothing crashes and it’s unlikely that we actually run into errors.

In this PR, you’re adding new error conditions depending on the return code we get from libuv. There are multiple ways we could deal with that, e.g. returning undefined from the getter (which this PR currently ends up doing, but in a somewhat unusual way), returning an empty string from the getter (which would be String::Empty() rather than Local<String>()), or throwing an exception.

When we throw an exception from a C++ function that is not directly exposed to JS, like RealEnvStore::Get(), the usual way to do that is to make the function return a MaybeLocal<> instead of a Local<>, and in the case of an error, throw an exception and return an empty handle (i.e. MaybeLocal<String>()) . Then, in the calling function (here that’s EnvGetter()), we check whether the return value is an empty MaybeLocal<>(), and if it is, we return to JS as quickly as possible to make the exception visible.

The typical way to throw an exception for a libuv error is to use env->ThrowUVException(libuv_error_ode, "function_name");, e.g. in this case env->ThrowUVException(ret, "getenv");. env is the current Environment* instance; you can get it through env = Environment::GetCurrent(isolate); in this case (or update the KVStore functions to take an Environment* instead of an Isolate* pointer in order to have the Environment* instance available – that might make sense anyway).

@joyeecheung If I have forgotten something, feel free to add that :)

devasci · 2019-04-20T14:44:36Z

@addaleax thank you for writing very clearly, that helped me a lot to understand node code better.

I've been working on the review comments you provided, most of them are fixed now. But i'm stuck with some error popping up while running make lint and make test.

I tried to see possible causes of the error but i'm unable to fix that. Please help me out here.

I get the below error, please assist me what could have been wrong:

devasci · 2019-04-20T18:17:49Z

got the issue and fixed it, tests are passing now.

addaleax

Awesome, this looks perfect!

nodejs-github-bot · 2019-04-20T18:33:01Z

CI: https://ci.nodejs.org/job/node-test-pull-request/22585/

devasci · 2019-04-20T18:47:47Z

😳 all tests are failing, looks like out/doc/applinks.json Error is back.
Need some assistance to understand the error and fix it.

If we do not throw UVException from RealEnv::Get method tests are passing. Should we dont throw any exception from RealEnv::Get method?

joyeecheung · 2019-04-21T10:57:54Z

@devasci The error is not related to doc tools, it indicates that the binary crashes on start up (which means there's a bug in the Get imeplementation - process.env getter is used a lot during bootstrap).

joyeecheung

I think the bug may be in SafeGetenv() because that's not really handling the returned maybe correctly?

src/node_env_var.cc

nodejs-github-bot · 2019-04-23T16:31:20Z

CI: https://ci.nodejs.org/job/node-test-pull-request/22659/

nodejs-github-bot · 2019-04-23T18:38:45Z

CI: https://ci.nodejs.org/job/node-test-pull-request/22663/

src/node_env_var.cc

addaleax · 2019-08-20T14:21:10Z

I’ve rebased this and kicked off a new CI. That should only fail on Windows and work once we have libuv/libuv#2419 in Node.js.

addaleax · 2019-09-09T19:33:50Z

This is going to be unblocked when #29508 lands.

nodejs-github-bot · 2019-09-12T09:32:21Z

CI: https://ci.nodejs.org/job/node-test-pull-request/25439/

nodejs-github-bot · 2019-09-12T16:44:07Z

CI: https://ci.nodejs.org/job/node-test-pull-request/25449/

Modified RealEnvStore::Get, Set, Query and Delete methods to use libuv methods environment variables operations instead of using os specific logic and switches. Fixes: #27211 Refs: http://docs.libuv.org/en/v1.x/misc.html PR-URL: #27310 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net>

addaleax · 2019-09-12T17:22:45Z

Landed in b354d12 🎉

@devasci Sorry it took so long, but congratulations to your first contribution!

Modified RealEnvStore::Get, Set, Query and Delete methods to use libuv methods environment variables operations instead of using os specific logic and switches. Fixes: #27211 Refs: http://docs.libuv.org/en/v1.x/misc.html PR-URL: #27310 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net>

devasci · 2019-10-03T14:30:14Z

Landed in b354d12 🎉

@devasci Sorry it took so long, but congratulations to your first contribution!

Thank you so much 😁 👍🏻

Setting an environment variable with an empty name on Windows resulted in an assertion failure, because it was checked for an '=' sign at the beginning without verifying the length was greater than 0. Fixes: #32920 Refs: #27310 PR-URL: #32921 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: David Carlier <devnexen@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com> Reviewed-By: Zeyu Yang <himself65@outlook.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>

nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Apr 19, 2019

devasci mentioned this pull request Apr 19, 2019

Refactor RealEnvStore methods to use uv_os_getenv/setenv/unsetenv #27211

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devasci force-pushed the d3v-dev branch from 7d1720d to 1936655 Compare April 19, 2019 17:30

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v12.11.0 proposal #29695

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cjihrig mentioned this pull request Dec 27, 2019

Assertion failed: len < MAX_ENV_VAR_LENGTH, file c:\ws\deps\uv\src\win\util.c, line 1476 libuv/libuv#2587

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bl-ue mentioned this pull request Apr 18, 2020

src: fix empty-named env var assertion failure #32921

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Fix to #27211 - Refactor RealEnvStore methods to use libuv methods for env operations #27310

Fix to #27211 - Refactor RealEnvStore methods to use libuv methods for env operations #27310

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Fix to #27211 - Refactor RealEnvStore methods to use libuv methods for env operations #27310

Fix to #27211 - Refactor RealEnvStore methods to use libuv methods for env operations #27310

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