buffer: improve atob performance

[anonrig]

The code is 99% written by @lemire, I just glued them all together.

This pull-request introduces a much faster atob implementation, and solves solves some security aspects of the previous implementation. Usage of atob is still discouraged.

Refs: #51670

Benchmarks

                                          confidence improvement accuracy (*)    (**)   (***)
buffers/buffer-atob.js n=1000000 size=16         ***    457.77 %       ±3.28%  ±4.42%  ±5.86%
buffers/buffer-atob.js n=1000000 size=256        ***   2505.57 %      ±15.69% ±21.14% ±28.07%
buffers/buffer-atob.js n=1000000 size=64         ***   1213.33 %       ±3.98%  ±5.36%  ±7.11%

Be aware that when doing many comparisons the risk of a false-positive result increases.
In this case, there are 3 comparisons, you can thus expect the following amount of false-positive results:
  0.15 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.03 false positives, when considering a   1% risk acceptance (**, ***),
  0.00 false positives, when considering a 0.1% risk acceptance (***)

[nodejs-github-bot]

Review requested:

• @nodejs/security-wg

[github-actions]

The notable-change PRs with changes that should be highlighted in changelogs. label has been added by @anonrig.

Please suggest a text for the release notes if you'd like to include a more detailed summary, then proceed to update the PR description with the text or a link to the notable change suggested text comment. Otherwise, the commit will be placed in the Other Notable Changes section.

[Jarred-Sumner]

nice

[H4ad]

Awesome 🚀

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/58146/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/58147/

[MattIPv4]

I notice that a comment referencing #38433 (comment) was removed.

Making these functions faster tells people that it’s okay to use them. It’s not, therefore let’s not worry about their performance at all.

Has the position changed, that these should now be optimized?

[lemire]

@MattIPv4 I won't comment directly on your objection, but I'd like to point out that the same approach can be used, and will be used, to accelerate the recommended Buffer functions.

There is, however, a significant difference between atob and the recommended Buffer functions: atob validates the input. The recommended Buffer functions offer no validation and are underspecified.

[MattIPv4]

To be clear, I don't object, I'm all for performance increase! Just wanted to check the overall position of Node was that this should be optimized now, when before it seems it wasn't

[anonrig]

To be clear, I don't object, I'm all for performance increase! Just wanted to check the overall position of Node was that this should be optimized now, when before it seems it wasn't

atob is deprecated and not recommended to be used (don't know why, but the reasoning doesn't matter for the purpose of this PR).

[richardlau]

I notice that a comment referencing #38433 (comment) was removed.

Making these functions faster tells people that it’s okay to use them. It’s not, therefore let’s not worry about their performance at all.

Has the position changed, that these should now be optimized?

It was discussed in a TSC meeting -- nodejs/TSC#1503, recording: https://www.youtube.com/watch?v=B5phSZ7jjwk. I can't seem to find the meeting minutes in the TSC repo -- the linked PR in the issue is for the following week's meeting.

My recollection is there was consensus in the meeting that #51670 could land (not sure why it hasn't) on the basis that it was purely JS and fairly minimal. Use of atob is still discouraged.

[richardlau]

This pull-request introduces blazing fast atob implementation which is more secure and faster.

Can you expand on/explain "more secure"?

[lemire]

@richardlau From the linked issue:

This is a DoS vector to the unaware user and irresponsible IMO.

[lemire]

(Note that the above comment is quote from the linked issue, not something @anonrig wrote.)

[mcollina]

lgtm, but not much useful in practice.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/58193/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/58198/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/58199/

[nodejs-github-bot]

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- Loading data for nodejs/node/pull/52381
✔  Done loading data for nodejs/node/pull/52381
----------------------------------- PR info ------------------------------------
Title      buffer: improve `atob` performance (#52381)
Author     Yagiz Nizipli  (@anonrig)
Branch     anonrig:deps/simdutf -> nodejs:main
Labels     buffer, lib / src, author ready, needs-ci, commit-queue-rebase
Commits    2
 - deps: update simdutf to 5.2.3
 - buffer: use simdutf for `atob` implementation
Committers 1
 - Yagiz Nizipli 
PR-URL: https://github.com/nodejs/node/pull/52381
Fixes: https://github.com/nodejs/node/pull/51670
Reviewed-By: Daniel Lemire 
Reviewed-By: Vinícius Lourenço Claro Cardoso 
Reviewed-By: Matteo Collina 
Reviewed-By: Robert Nagy 
Reviewed-By: Benjamin Gruenbaum 
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/52381
Fixes: https://github.com/nodejs/node/pull/51670
Reviewed-By: Daniel Lemire 
Reviewed-By: Vinícius Lourenço Claro Cardoso 
Reviewed-By: Matteo Collina 
Reviewed-By: Robert Nagy 
Reviewed-By: Benjamin Gruenbaum 
--------------------------------------------------------------------------------
   ℹ  This PR was created on Fri, 05 Apr 2024 21:43:53 GMT
   ✔  Approvals: 5
   ✔  - Daniel Lemire (@lemire): https://github.com/nodejs/node/pull/52381#pullrequestreview-1984251249
   ✔  - Vinícius Lourenço Claro Cardoso (@H4ad): https://github.com/nodejs/node/pull/52381#pullrequestreview-1984254833
   ✔  - Matteo Collina (@mcollina) (TSC): https://github.com/nodejs/node/pull/52381#pullrequestreview-1984441422
   ✔  - Robert Nagy (@ronag) (TSC): https://github.com/nodejs/node/pull/52381#pullrequestreview-1984457362
   ✔  - Benjamin Gruenbaum (@benjamingr) (TSC): https://github.com/nodejs/node/pull/52381#pullrequestreview-1984572522
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- Bringing origin/main up to date...
From https://github.com/nodejs/node
 * branch                  main       -> FETCH_HEAD
✔  origin/main is now up-to-date
- Downloading patch for 52381
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--------------------------------------------------------------------------------
[main 1b747b2803] deps: update simdutf to 5.2.3
 Author: Yagiz Nizipli 
 Date: Thu Apr 4 17:53:41 2024 -0400
 2 files changed, 2204 insertions(+), 959 deletions(-)
Auto-merging src/node_buffer.cc
[main 225c7e7795] buffer: use simdutf for `atob` implementation
 Author: Yagiz Nizipli 
 Date: Thu Apr 4 18:03:17 2024 -0400
 3 files changed, 93 insertions(+), 73 deletions(-)
 create mode 100644 benchmark/buffers/buffer-atob.js
   ✔  Patches applied
There are 2 commits in the PR. Attempting autorebase.
Rebasing (2/4)
Executing: git node land --amend --yes

--------------------------------- New Message ----------------------------------

deps: update simdutf to 5.2.3
PR-URL: #52381

Fixes: #51670

Reviewed-By: Daniel Lemire daniel@lemire.me

Reviewed-By: Vinícius Lourenço Claro Cardoso contact@viniciusl.com.br

Reviewed-By: Matteo Collina matteo.collina@gmail.com

Reviewed-By: Robert Nagy ronagy@icloud.com

Reviewed-By: Benjamin Gruenbaum benjamingr@gmail.com
[detached HEAD ce2fd04108] deps: update simdutf to 5.2.3

Author: Yagiz Nizipli yagiz@nizipli.com

Date: Thu Apr 4 17:53:41 2024 -0400

2 files changed, 2204 insertions(+), 959 deletions(-)

Rebasing (3/4)

Rebasing (4/4)
Executing: git node land --amend --yes

--------------------------------- New Message ----------------------------------

buffer: use simdutf for atob implementation
Co-authored-by: Daniel Lemire daniel@lemire.me

PR-URL: #52381

Fixes: #51670

Reviewed-By: Daniel Lemire daniel@lemire.me

Reviewed-By: Vinícius Lourenço Claro Cardoso contact@viniciusl.com.br

Reviewed-By: Matteo Collina matteo.collina@gmail.com

Reviewed-By: Robert Nagy ronagy@icloud.com

Reviewed-By: Benjamin Gruenbaum benjamingr@gmail.com
[detached HEAD d8a53adcd5] buffer: use simdutf for atob implementation

Author: Yagiz Nizipli yagiz@nizipli.com

Date: Thu Apr 4 18:03:17 2024 -0400

3 files changed, 93 insertions(+), 73 deletions(-)

create mode 100644 benchmark/buffers/buffer-atob.js
Successfully rebased and updated refs/heads/main.
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[Uzlopak]

LGTM

[nodejs-github-bot]

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