util: truncate inspect array and typed array #6334

jasnell · 2016-04-21T17:32:18Z

Checklist

tests and code linting passes
a test and/or benchmark is included
documentation is changed or added
the commit message follows commit guidelines

Affected core subsystem(s)

util

Description of change

As an alternative to #5070, set the max length of Arrays/TypedArrays in util.inspect() to 100 and provide a maxArrayLength option to override.

jasnell · 2016-04-22T16:36:13Z

Refs: #4905

jasnell · 2016-04-22T17:26:05Z

Refs: #3648

addaleax · 2016-04-22T17:31:55Z

doc/api/util.md

@@ -179,6 +179,10 @@ formatted string:
 - `customInspect` - if `false`, then custom `inspect(depth, opts)` functions
   defined on the objects being inspected won't be called. Defaults to `true`.

+ - `maxArrayLength` - specifies the maximum number of Array and TypedArray
+   elements to include when formatting. Defaults to `100`. Set to `Infinity`
+   to show all Array elements. Set to 0 or negative to show no array elements.


tiny nits: Maybe capitalize Array elements consistently in this line, and enclose the constant 0 in backticks?

addaleax · 2016-04-22T17:34:24Z

Maybe copy the added tests to cover TypedArray, too? Either way, LGTM.

jasnell · 2016-04-22T18:09:21Z

@addaleax ... done! ;-)

silverwind · 2016-04-22T18:54:31Z

What's so special about arrays? Why not make it a more general maxBytes that would apply to objects and strings too? -1 from me in the current form.

silverwind · 2016-04-22T18:56:49Z

Oh, and the option for infinity is inconsistent with the depth option of the same function, where null means unrestricted logging.

jasnell · 2016-04-22T19:31:04Z

We already have depth for objects. Would not be opposed to adding a limit for strings. maxBytes could be a bit difficult to track based on how inspect is building things out. Not impossible, of course, just a bit more complicated. Perhaps we can make the option maxLength and have it mean maximum number of characters when inspecting a string, and mean maximum number of elements when inspecting an array?

jasnell · 2016-04-29T05:52:09Z

oh, and to answer the question about what's special about arrays ... attempting to inspect an array that's too large brings the node process down. I have no issue with evolving this to place other limits, but limiting the array output is the bit we currently have open issues on. See #5070

jasnell · 2016-04-29T06:02:12Z

Updated, PTAL

addaleax · 2016-04-29T12:52:44Z

Still LGTM.

I’d say arrays are also special because they are the appropriate data type for (possibly large amounts) of homogeneous data, so omitting out a number of items is probably usually okay. Maybe something like this change would make sense for strings too, but not for objects, because there would be no natural way of guessing which keys to leave out when printing.

jasnell · 2016-04-29T23:00:49Z

@silverwind ... any further thoughts on this? do you still object?

silverwind · 2016-04-30T09:10:39Z

@jasnell no, seems reasonable. I'm only concerned about the option. depth takes null, maxArrayLength takes null or Infinity. How about making it just null for consistency?

jasnell · 2016-04-30T16:48:41Z

@silverwind ... I can do that... but how about only in docs? If someone happens to pass Infinity it would still just work.

mcollina · 2016-04-30T16:55:51Z

LGTM

jasnell · 2016-04-30T20:52:20Z

CI: https://ci.nodejs.org/job/node-test-pull-request/2443/

jasnell · 2016-04-30T20:53:50Z

@silverwind ... updated the doc to only mention setting maxArrayLength to null to specify no limit. Infinity can still be passed and it would work, but the only documented option is null to keep it consistent. Also made one other minor cleanup tweak. Running CI now. Assuming CI is green and there are no objections, I'll land on Monday.

jasnell · 2016-05-01T23:03:07Z

CI is green.

Fishrock123 · 2016-05-02T14:21:56Z

doc/api/util.md

@@ -179,6 +179,10 @@ formatted string:
 - `customInspect` - if `false`, then custom `inspect(depth, opts)` functions
   defined on the objects being inspected won't be called. Defaults to `true`.

+ - `maxArrayLength` - specifies the maximum number of Array and TypedArray
+   elements to include when formatting. Defaults to `100`. Set to `null` to
+   show all array elements. Set to `0` or negative to show no array elements.


Why not just set to Infinity for all elements?

See prior discussion.

Fishrock123 · 2016-05-02T14:24:39Z

lgtm if nits are addressed

Fishrock123 · 2016-05-02T15:38:20Z

If this is already major, maybe prefer moving the preference to Infinity over null for the other option? Or would it be better to do that in a new PR?

silverwind · 2016-05-02T16:33:02Z

Infinity also work on depth, so I guess it's fine to leave it undocumented:

> util.inspect({a:{a:{a:{a:1}}}})
'{ a: { a: { a: [Object] } } }'
> util.inspect({a:{a:{a:{a:1}}}}, {depth: null})
'{ a: { a: { a: { a: 1 } } } }'
> util.inspect({a:{a:{a:{a:1}}}}, {depth: Infinity})
'{ a: { a: { a: { a: 1 } } } }'

LGTM

jasnell · 2016-05-02T16:52:41Z

@silverwind @addaleax @mcollina ... any thoughts on whether this has to be semver-major or do you think we can treat it as a bug fix?

Fishrock123 · 2016-05-02T16:57:17Z

I don't think very many changes to util.inspect() should be considered major. It's primary purpose is creating human-readable output.

silverwind · 2016-05-02T17:01:00Z

I guess semver-minor would be fine.

addaleax · 2016-05-02T17:05:14Z

+1 to semver-minor.

jasnell · 2016-05-03T18:00:41Z

New CI after rebase: https://ci.nodejs.org/job/node-test-pull-request/2484/
will land after if it's green.

As an alternative to nodejs#5070, set the max length of Arrays/TypedArrays in util.inspect() to `100` and provide a `maxArrayLength` option to override.

jasnell · 2016-05-03T18:39:17Z

Green. unrelated flaky timeout in rpi.

As an alternative to #5070, set the max length of Arrays/TypedArrays in util.inspect() to `100` and provide a `maxArrayLength` option to override. PR-URL: #6334 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Jeremiah Senkpiel <[email protected]> Reviewed-By: Roman Reiss <[email protected]>

jasnell · 2016-05-03T18:39:31Z

Landed in a2e5719

mcollina · 2016-05-03T18:53:15Z

Ok for semver-minor.

jasnell · 2016-05-03T18:53:41Z

Thank you @mcollina :-)

As an alternative to #5070, set the max length of Arrays/TypedArrays in util.inspect() to `100` and provide a `maxArrayLength` option to override. PR-URL: #6334 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Jeremiah Senkpiel <[email protected]> Reviewed-By: Roman Reiss <[email protected]>

As an alternative to nodejs#5070, set the max length of Arrays/TypedArrays in util.inspect() to `100` and provide a `maxArrayLength` option to override. PR-URL: nodejs#6334 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Jeremiah Senkpiel <[email protected]> Reviewed-By: Roman Reiss <[email protected]>

* assert: `deep{Strict}Equal()` now works correctly with circular references. (Rich Trott) #6432 * debugger: Arrays are now formatted correctly in the debugger repl. (cjihrig) #6448 * deps: Upgrade OpenSSL sources to 1.0.2h (Shigeki Ohtsu) #6550 * net: Introduced a `Socket#connecting` property. (Fedor Indutny) #6404 - Previously this information was only available as the undocumented, internal `_connecting` property. * process: Introduced `process.cpuUsage()`. (Patrick Mueller) #6157 * stream: `Writable#setDefaultEncoding()` now returns `this`. (Alexander Makarenko) #5040 * util: Two new additions to `util.inspect()`: - Added a `maxArrayLength` option to truncate the formatting of Arrays. (James M Snell) #6334 - This is set to `100` by default. - Added a `showProxy` option for formatting proxy intercepting handlers. (James M Snell) #6465 - Inspecting proxies is non-trivial and as such this is off by default. PR-URL: #6557

* assert: `deep{Strict}Equal()` now works correctly with circular references. (Rich Trott) #6432 * debugger: Arrays are now formatted correctly in the debugger repl. (cjihrig) #6448 * deps: Upgrade OpenSSL sources to 1.0.2h (Shigeki Ohtsu) #6550 - Please see our blog post for more info on the security contents of this release: - https://nodejs.org/en/blog/vulnerability/openssl-may-2016/ * net: Introduced a `Socket#connecting` property. (Fedor Indutny) #6404 - Previously this information was only available as the undocumented, internal `_connecting` property. * process: Introduced `process.cpuUsage()`. (Patrick Mueller) #6157 * stream: `Writable#setDefaultEncoding()` now returns `this`. (Alexander Makarenko) #5040 * util: Two new additions to `util.inspect()`: - Added a `maxArrayLength` option to truncate the formatting of Arrays. (James M Snell) #6334 - This is set to `100` by default. - Added a `showProxy` option for formatting proxy intercepting handlers. (James M Snell) #6465 - Inspecting proxies is non-trivial and as such this is off by default. PR-URL: #6557

jasnell added util Issues and PRs related to the built-in util module. semver-major PRs that contain breaking changes and should be released in the next major version. labels Apr 21, 2016

jasnell mentioned this pull request Apr 21, 2016

util: compact inspect() for sparse arrays #5070

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addaleax reviewed Apr 22, 2016
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jasnell force-pushed the util-inspect-array branch from 5b8f4bb to 12c33ae Compare April 22, 2016 18:09

estliberitas force-pushed the master branch 2 times, most recently from 7da4fd4 to c7066fb Compare April 26, 2016 05:23

jasnell force-pushed the util-inspect-array branch from 12c33ae to 67acb26 Compare April 29, 2016 06:01

jasnell force-pushed the util-inspect-array branch from 67acb26 to 73524c6 Compare April 30, 2016 20:49

Fishrock123 reviewed May 2, 2016
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jasnell added semver-minor PRs that contain new features and should be released in the next minor version. and removed semver-major PRs that contain breaking changes and should be released in the next major version. labels May 2, 2016

jasnell force-pushed the util-inspect-array branch from 73524c6 to 41cc07e Compare May 3, 2016 17:59

util: truncate inspect array and typed array

2b87241

As an alternative to nodejs#5070, set the max length of Arrays/TypedArrays in util.inspect() to `100` and provide a `maxArrayLength` option to override.

jasnell force-pushed the util-inspect-array branch from 41cc07e to 2b87241 Compare May 3, 2016 18:36

jasnell closed this May 3, 2016

This was referenced May 3, 2016

Node crashes when a big sparse array is given to console.log (might cause DoS) #4905

Closed

util.inspect is not so hot on large typed arrays #3648

Closed

This was referenced May 4, 2016

Propose v6.1.0 wrong base please ignore #6556

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Propose v6.1.0 (Openssl update) #6557

Merged

BridgeAR mentioned this pull request Aug 25, 2018

util: improve util inspect performance #22503

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4 tasks

lydell mentioned this pull request May 1, 2022

Truncate long Set and Map in util.inspect/console.log/REPL, just like long Array #42933

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util: truncate inspect array and typed array #6334

util: truncate inspect array and typed array #6334

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util: truncate inspect array and typed array #6334

util: truncate inspect array and typed array #6334

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jasnell commented Apr 21, 2016

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