url: use SafeSet to filter known special protocols #24703
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nodejs-github-bot
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can they just be changed to maps? |
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@devsnek, They could be changed to Sets. There's no need to lookup a value. Would you prefer that? |
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@mikesamuel i would definitely prefer using sets |
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This seems to make the code harder to understand. We usually just go with |
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I think the reason to no use null prototype objects was lookup performance. I don't know if it's still faster. |
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Reworking to use sets. @lpinca, Re performance, https://github.com/anvaka/set-vs-object#conclusion is one microbenchmark. |
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I changed it to use SafeSet (thanks @joyeecheung), squashed the commits, and changed the PR description to reflect that. |
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I think my squash broke Travis's first commit message check :( |
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@mikesamuel Can you update the commit message to something that describes the current approach? (e.g. something like |
Avoids a maintenance hazard when reviewers assume that
`hostlessProtocol` and `slashedProtocol` are disjoint.
The following may be counter-intuitive:
```js
// These objects seem to have no keys in common
const hostlessProtocol = { 'javascript': true };
const slashedProtocol = { 'http': true };
// A reasonable reviewer may assumes bothTrue is never truthy
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
// But
console.log(Boolean(bothTrue('constructor'))); // true
```
This change uses SafeSet instead of plain-old objects.
----
Rejected alternative:
We could have used object with a `null` prototype as lookup tables
so that `lowerProto` is never treated as a key into `Object.prototype`.
```js
const hostlessProtocol = { __proto__: null, 'javascript': true };
const slashedProtocol = { __proto__: null, 'http': true };
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
console.log(Boolean(bothTrue('constructor'))); // false
```
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@joyeecheung, done |
mikesamuel
changed the title
joyeecheung
approved these changes
Nov 29, 2018
cjihrig
approved these changes
Nov 29, 2018
jasnell
approved these changes
Nov 30, 2018
Trott
added
the
author ready
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(Benchmark tradeoffs look perfectly acceptable to me, but second opinion welcome.) |
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Resume Build CI: https://ci.nodejs.org/job/node-test-pull-request/19114/ |
Trott
pushed a commit
to Trott/io.js
that referenced
this pull request
Dec 1, 2018
Avoids a maintenance hazard when reviewers assume that
`hostlessProtocol` and `slashedProtocol` are disjoint.
The following may be counter-intuitive:
```js
// These objects seem to have no keys in common
const hostlessProtocol = { 'javascript': true };
const slashedProtocol = { 'http': true };
// A reasonable reviewer may assumes bothTrue is never truthy
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
// But
console.log(Boolean(bothTrue('constructor'))); // true
```
This change uses SafeSet instead of plain-old objects.
----
Rejected alternative:
We could have used object with a `null` prototype as lookup tables
so that `lowerProto` is never treated as a key into `Object.prototype`.
```js
const hostlessProtocol = { __proto__: null, 'javascript': true };
const slashedProtocol = { __proto__: null, 'http': true };
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
console.log(Boolean(bothTrue('constructor'))); // false
```
PR-URL: nodejs#24703
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
|
Landed in 0d23118. Thanks for the contribution! 🎉 |
|
Post-mortem: benchmark results. The most significant ones (with Benchmark resultsSignificant impact |
BridgeAR
pushed a commit
that referenced
this pull request
Dec 5, 2018
Avoids a maintenance hazard when reviewers assume that
`hostlessProtocol` and `slashedProtocol` are disjoint.
The following may be counter-intuitive:
```js
// These objects seem to have no keys in common
const hostlessProtocol = { 'javascript': true };
const slashedProtocol = { 'http': true };
// A reasonable reviewer may assumes bothTrue is never truthy
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
// But
console.log(Boolean(bothTrue('constructor'))); // true
```
This change uses SafeSet instead of plain-old objects.
----
Rejected alternative:
We could have used object with a `null` prototype as lookup tables
so that `lowerProto` is never treated as a key into `Object.prototype`.
```js
const hostlessProtocol = { __proto__: null, 'javascript': true };
const slashedProtocol = { __proto__: null, 'http': true };
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
console.log(Boolean(bothTrue('constructor'))); // false
```
PR-URL: #24703
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
This was referenced Dec 7, 2018
refack
pushed a commit
to refack/node
that referenced
this pull request
Jan 14, 2019
Avoids a maintenance hazard when reviewers assume that
`hostlessProtocol` and `slashedProtocol` are disjoint.
The following may be counter-intuitive:
```js
// These objects seem to have no keys in common
const hostlessProtocol = { 'javascript': true };
const slashedProtocol = { 'http': true };
// A reasonable reviewer may assumes bothTrue is never truthy
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
// But
console.log(Boolean(bothTrue('constructor'))); // true
```
This change uses SafeSet instead of plain-old objects.
----
Rejected alternative:
We could have used object with a `null` prototype as lookup tables
so that `lowerProto` is never treated as a key into `Object.prototype`.
```js
const hostlessProtocol = { __proto__: null, 'javascript': true };
const slashedProtocol = { __proto__: null, 'http': true };
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
console.log(Boolean(bothTrue('constructor'))); // false
```
PR-URL: nodejs#24703
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
BethGriggs
pushed a commit
that referenced
this pull request
Feb 12, 2019
Avoids a maintenance hazard when reviewers assume that
`hostlessProtocol` and `slashedProtocol` are disjoint.
The following may be counter-intuitive:
```js
// These objects seem to have no keys in common
const hostlessProtocol = { 'javascript': true };
const slashedProtocol = { 'http': true };
// A reasonable reviewer may assumes bothTrue is never truthy
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
// But
console.log(Boolean(bothTrue('constructor'))); // true
```
This change uses SafeSet instead of plain-old objects.
----
Rejected alternative:
We could have used object with a `null` prototype as lookup tables
so that `lowerProto` is never treated as a key into `Object.prototype`.
```js
const hostlessProtocol = { __proto__: null, 'javascript': true };
const slashedProtocol = { __proto__: null, 'http': true };
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
console.log(Boolean(bothTrue('constructor'))); // false
```
PR-URL: #24703
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Merged
rvagg
pushed a commit
that referenced
this pull request
Feb 28, 2019
Avoids a maintenance hazard when reviewers assume that
`hostlessProtocol` and `slashedProtocol` are disjoint.
The following may be counter-intuitive:
```js
// These objects seem to have no keys in common
const hostlessProtocol = { 'javascript': true };
const slashedProtocol = { 'http': true };
// A reasonable reviewer may assumes bothTrue is never truthy
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
// But
console.log(Boolean(bothTrue('constructor'))); // true
```
This change uses SafeSet instead of plain-old objects.
----
Rejected alternative:
We could have used object with a `null` prototype as lookup tables
so that `lowerProto` is never treated as a key into `Object.prototype`.
```js
const hostlessProtocol = { __proto__: null, 'javascript': true };
const slashedProtocol = { __proto__: null, 'http': true };
function bothTrue(lowerProto) {
return hostlessProtocol[lowerProto] && slashedProtocol[lowerProto];
}
console.log(Boolean(bothTrue('constructor'))); // false
```
PR-URL: #24703
Reviewed-By: Joyee Cheung <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>
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Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passesAvoids a maintenance hazard when reviewers assume that
hostlessProtocolandslashedProtocolare disjoint.The following may be counter-intuitive:
This change uses SafeSet instead of plain-old objects.
Rejected alternative:
We could have used object with a
nullprototype as lookup tablesso that
lowerProtois never treated as a key intoObject.prototype.