ruby-prof-flamegraph
====================

A [ruby-prof][] printer that outputs a fold stack file that's compatible with [FlameGraph][].
It is created based on `RubyProf::CallStackPrinter`.


Awesomeness
-----------

[FlameGraph][] is a way to visualize stack trace,
making it very obvious where in the program takes the longest time.
It is a Perl script takes a "fold stack" file and generates a nice, interactive SVG.
The fold stack is usually generated from DTrace or Prof data using [stackcollapse.pl][FlameGraph], which is included with FlameGraph.

I created this gem because I want to find out where the bottleneck is in [SlimWiki][]'s specs,
but I don't know DTrace and just want the result quick.

I did not expect this,
but generating a company name from Faker causes 44 YAML files to be parsed,
taking 28 seconds.

(TODO include image)


To learn more about Flame Graphs, check these out:

- [Official Flame Graphs Website](http://www.brendangregg.com/flamegraphs.html) by [Brendan Gregg](http://www.brendangregg.com/)
- [Node.js in Flames](http://techblog.netflix.com/2014/11/nodejs-in-flames.html), which is the article that introduced me to flame graph (via [Node Weekly Issue #62](http://nodeweekly.com/issues/62))
- [Blazing Performance with Flame Graphs](https://www.usenix.org/conference/lisa13/technical-sessions/plenary/gregg) talk at USENIX/LISA13 ([slideshare](http://www.slideshare.net/brendangregg/blazing-performance-with-flame-graphs?ref=http://www.brendangregg.com/flamegraphs.html)) ([video](http://www.youtube.com/watch?v=nZfNehCzGdw))



[ruby-prof]: https://github.com/ruby-prof/ruby-prof
[FlameGraph]: https://github.com/brendangregg/FlameGraph
[SlimWiki]: https://slimwiki.com/


## Installation

```ruby
gem 'ruby-prof-flamegraph'
```


## Usage

Just `require 'ruby-prof-flamegraph` and use `RubyProf::FlameGraphPrinter` as your printer for ruby-prof.
For vanilla ruby-prof, see [example.rb](example.rb).

For rspec-prof, `RSpecProf.printer_class = RubyProf::FlameGraphPrinter`

[rspec-prof]: https://github.com/sinisterchipmunk/rspec-prof



## Example

See the result in [example.svg][]

[example.svg]: example.svg



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ruby-prof-flamegraph

Thai Pangsakulyanont

(Experimental) An ambiguous license classifier was found.

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Ambiguous License Classifier

Source files are encoded using a non-standard text encoding.

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Bad text encoding

Package version is not a valid semantic version (semver).

What is bad semver?

Bad semver

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Bad dependency semver

Source files contain bidirectional unicode control characters. This could indicate a Trojan source supply chain attack. See: trojansource.codes for more information.

What are bidirectional unicode control characters?

Bidirectional unicode control characters

This package has multiple bin scripts with the same name. This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack.

What is bin script confusion?

Bin script confusion

Semantic versions published out of chronological order.

What is a chronological version anomaly?

Chronological version anomaly

Project maintainer's SSH key has been compromised.

What is a compromised SSH key?

Compromised SSH key

(Experimental) Copyleft license information was found.

What do I need to know about license files?

Copyleft License

Contains a Critical Common Vulnerability and Exposure (CVE).

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Title

Critical CVE

Contains a high severity Common Vulnerability and Exposure (CVE).

What is a CVE?

High CVE

Uses debug, reflection and dynamic code execution features.

What is debug access?

Debug access

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Deprecated

(Experimental) Contains a known deprecated SPDX license exception.

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Deprecated SPDX exception

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Deprecated license

Package name is similar to other popular packages and may not be the package you want.

What is a typosquat?

Possible typosquat attack

Dynamic require can indicate the package is performing dangerous or unsafe dynamic code execution.

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Dynamic require

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Empty package

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Name

Extraneous dependency

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File dependency

Accesses the file system, and could potentially read sensitive data.

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Filesystem access

Package has a dependency with a floating version range. This can cause issues if the dependency publishes a new major version.

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Wildcard dependency

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Git dependency

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GitHub dependency

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AI-detected potential code anomaly

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AI-detected potential malware

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AI-detected potential security risk

Contains native code (e.g., compiled binaries or shared libraries). Including native code can obscure malicious behavior.

Why is native code a concern?

Native code

Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

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High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

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Unicode homoglyphs

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What are http dependencies?

HTTP dependency

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

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Install scripts

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Invalid manifest file

Source files contain invisible characters. This could indicate source obfuscation or a supply chain attack.

What are invisible characters?

Invisible chars

(Experimental) Package license has recently changed.

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License exception

This package is not allowed per your license policy. Review the package's license to ensure compliance.

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License Policy Violation

Contains long string literals, which may be a sign of obfuscated or packed code.

What's wrong with long strings?

Long strings

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

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Major refactor

This package is malware. We have asked the package registry to remove it.

What is known malware?

Known malware

This package has inconsistent metadata. This could be malicious or caused by an error when publishing the package.

What is manifest confusion?

Manifest confusion

Contains a medium severity Common Vulnerability and Exposure (CVE).

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Medium CVE

Contains a low severity Common Vulnerability and Exposure (CVE).

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Low CVE

This package contains minified code. This may be harmless in some cases where minified code is included in packaged libraries, however packages on npm should not minify code.

What's wrong with minified code?

Minified code

(Experimental) A package's licensing information has fine-grained problems.

Misc. License Issues

The package was published by an npm account that no longer exists.

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Non-existent author

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Missing package tarball

(Experimental) Package contains multiple licenses.

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Mixed license

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Modified license exception

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Modified license

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Network access

A new npm collaborator published a version of the package for the first time. New collaborators are usually benign additions to a project, but do indicate a change to the security surface area of a package.

What is new author?

New author

Package does not specify a list of contributors or an author in package.json.

Why is contributor and author data important?

No contributors or author data

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No bug tracker

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No License Found

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No README

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No repository

Package does not have any tests. This is a strong signal of a poorly maintained or low quality package.

What does no tests mean?

No tests

Package is not semver >=1. This means it is not stable and does not support ^ ranges.

ruby-prof-flamegraph

ruby-prof-flamegraph

Awesomeness

Installation

Usage

Example

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