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Code Quality

Autoscaler uses Pre-commit for keeping our code base clean. It is a package manager fo git hooks. Upon a git commit, it checks .go and .java files for potential code problems.

Two static code analyzers are used as git-hooks which are defined in the .pre-commit-config file.

We recommend to install pre-commit on develop machines. This will help to catch issue before code review.

IntelliJ java code style import

To get intellij to play nice with the google code style checker we need to import the code style for intellij To do this follow the IDE setup on the google format home page

Install Pre-Commit

Install Pre-commit on developer laptop

  • using pip
pip install pre-commit
pre-commit install
  • using curl
curl https://pre-commit.com/install-local.py | python -
pre-commit install
  • using homebrew
brew install pre-commit
pre-commit install
  • using conda
conda install -c conda-forge pre-commit
pre-commit install

Usage

git add <files>
git commit -m <message>

Real World Example

Commit changes from Local

$ git commit  -m "aas82 fix GHA linter:  Golang and Java - local"
[WARNING] Unstaged files detected.
[INFO] Stashing unstaged files to /Users/<USER>/.cache/pre-commit/patch1629118042-59848.
java-formatter...........................................................Failed
- hook id: java-formatter
- exit code: 1

Running Checkstyle using <APP_AUTOSCALER_REPO>/.cache/$CHECKSTYLE_JAR_NAME...
[WARN] <APP_AUTOSCALER_REPO>/scheduler/src/main/java/org/cloudfoundry/autoscaler/scheduler/util/DataValidationHelper.java:19:19: Abbreviation in name 'LINTTT_CHECK' must contain no more than '1' consecutive capital letters. [AbbreviationAsWordInName]
[WARN] <APP_AUTOSCALER_REPO>scheduler/src/main/java/org/cloudfoundry/autoscaler/scheduler/util/DataValidationHelper.java:19:19: Member name 'LINTTT_CHECK' must match pattern '^[a-z][a-z0-9][a-zA-Z0-9]*$'. [MemberName]

golangci-lint............................................................Failed
- hook id: golangci-lint
- exit code: 2

<APP_AUTOSCALER_REPO>/src/autoscaler
golangci-lint run
api/brokerserver/broker_handler.go:24: File is not `gofmt`-ed with `-s` (gofmt)
              logger          lager.Logger
make: *** [lint] Error 1

[INFO] Restored changes from /Users/<USER>/.cache/pre-commit/patch1629118042-59848.

In the above output, Some issues has been reported:

Go File: incorrect formatting in api/brokerserver/broker_handler.go:24 (reported by Golangci-lint)

Java: Incorrect variable name reported by Java-formatter

To fix them:

For Go:

gofmt -s -w api/brokerserver/broker_handler.go

For Java, just correct the variable name

Upon committing again, Golangci-lint passed but java-formatter has reported some formatting problems:

$ git commit  -m "aas82 fix GHA linter:  Golang and Java - local"                                                                              
[WARNING] Unstaged files detected.
[INFO] Stashing unstaged files to /Users/<USER>/.cache/pre-commit/patch1629118377-61629.
java-formatter...........................................................Failed
- hook id: java-formatter
- exit code: 2

Running Checkstyle using <APP_AUTOSCALER_REPO>/.cache/CHECKSTYLE_JAR_NAME...
============================================================
Google Formatting using <APP_AUTOSCALER_REPO>/.cache/google-java-format-1.11.0-all-deps.jar...
Incorrect formatting found:
Please correct the formatting of the files(s) using one of the following options:
   java --add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED  -jar <APP_AUTOSCALER_REPO>/.cache/google-java-format-1.11.0-all-deps.jar -replace --skip-javadoc-formatting scheduler/src/main/java/org/cloudfoundry/autoscaler/scheduler/util/DataValidationHelper.java

golangci-lint............................................................Passed
[INFO] Restored changes from /Users/<USER>/.cache/pre-commit/patch1629118377-61629.

To fix them, just execute the command as suggested by the java-formatter. It will auto-format the java sources.

java --add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED \
   --add-exports jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED \
  --add-exports jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED \
  --add-exports jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
  --add-exports jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED  
  -jar <APP_AUTOSCALER_REPO>/.cache/google-java-format-1.11.0-all-deps.jar \
  -replace --skip-javadoc-formatting scheduler/src/main/java/org/cloudfoundry/autoscaler/scheduler/util/DataValidationHelper.java

Successful Commit

$ git commit  -m "aas82 fix GHA linter:  Golang and Java - local"                                      
[WARNING] Unstaged files detected.
[INFO] Stashing unstaged files to /Users/<USER>/.cache/pre-commit/patch1629118875-64154.
java-formatter...........................................................Passed
golangci-lint............................................................Passed
[INFO] Restored changes from /Users/<USER>/.cache/pre-commit/patch1629118875-64154.
[aas82-verify-linters cff357fa] aas82 fix GHA linter:  Golang and Java - local
 3 files changed, 8 insertions(+), 4 deletions(-)

Skip Pre-Commit Git Hook Locally

git commit --no-verify -m "<COMMI_MESSAGE"

Note: The same static code analyzers are used via GitHub Actions.