Chart Map

See some examples → https://alfresco.github.io/alfresco-anaxes-chartmap/

Overview

This project generates a file that shows the recursive dependencies of a Helm Chart.

The generated file can be in either PlantUML text format, JSON format or plain text format.

The most useful format is PlantUML since this offers a visual representation of the chart dependencies. See the example below. For more information about PlantUML, see http://plantuml.com/.

Note that although this project was created in the Alfresco GitHub org, ChartMap can be used with any Helm Chart. An illustration of this point can be found in the examples.

Prerequisites

Java 8 or later.

Helm Client 2.9.1 or later. The Helm Client is required since the chart map is based on the dependencies discovered by the Kubernetes Helm client. I have tested it with version 2.9.1 of the Helm Client though other versions may also work.

For instructions on installing the Helm Client, see https://docs.helm.sh/using_helm/#installing-helm

The junit test cases rely on the environment variable HELM_HOME being set.

Using Chart Map

Setup

1. Download the executable jar from the resource directory, or build it yourself from source (see below).

2. Run the command line, or write a Java program using the API, to generate a chart. See Syntax and Examples below.

Command Line Syntax

                                    
java -jar ---<filename>---+---  -a <apprspec>----+---  -o <filename>---  -d <directoryname>----+---------------------+--+------------+---+------------+---+------------+
                          |                      |                                             |                     |  |            |   |            |   |            |
                          +---  -c <chartname>---+                                             +---  -e <filename ---+  +---  -r  ---+   +---  -v  ---+   +---  -h  ---+
                          |                      |                                                                       
                          +---  -f <filename>----+                                                                       
                          |                      |                                                                       
                          +---  -u <url>---------+        
                   

Parameters

• Required
  • <filename>
    • The name of the jar file (e.g. target/chartmap-1.0-SNAPSHOT.jar)
  • To specify the Helm Chart, one of the following input formats must be specified
    • -a <apprspec>
      • The name and version of the chart as an appr specification <host>/<org>/<chart-name>@<chart-version>
    • -c <chartname>
      • The name and version of the chart in the format <chart-name:chart-version>
    • -f <filename>
      • The location in the file system for a Helm Chart package (a tgz file)
    • -u <url>
      • A url for the Helm Chart
  • -d <directoryname>
    • The file system location of HELM_HOME
  • -o <filename>
    • The name of the file to be generated.
      If a file extension of 'puml' is specifed the format of the generated file will be PlantUML. If a file extension of 'json' is specifed the format of the generated file will be in JSON format. Otherwise it will be plain text.
• Optional
  • -e <filename>
    • The location of an Environment Specification which is a yaml file containing a list of environment variables to set before rendering helm templates. See the example environment specification provided in resource/example-env-spec.yaml to understand the format.
  • -h
    • Help. Whenever specified, any other parameters are ignored. When no parameters are specified, -h is assumed.
  • -r
    • Refresh. If specified, the Helm command helm update dependencies will be run before generating the chart map
  • -v
    • Verbose. If specified, some extra command line output is shown

Example Commands

Generating a Chartmap using a chart reference

java -jar chartmap-1.0-SNAPSHOT.jar -c "wordpress:0.8.17" -r -v -o "wordpress.puml" -d "/Users/melahn/.helm"

Generating a Chartmap using a file specification

java -jar chartmap-1.0-SNAPSHOT.jar -f "/Users/melahn/helm/alfresco-content-services-1.0.1.tgz" " -d "/Users/melahn/.helm" -o  alfresco-dbp.puml -v

Generating a Chartmap using a url specification

java -jar chartmap-1.0-SNAPSHOT.jar -u "http://kubernetes-charts.alfresco.com/stable/alfresco-content-services-1.0.1.tgz" " -d "/Users/melahn/.helm" -o  alfresco-dbp.puml -v

Generating a Chartmap using an appr specification

java -jar chartmap-1.0-SNAPSHOT.jar -a "quay.io/alfresco/[email protected]" -d "/Users/melahn/.helm" -o  alfresco-dbp.puml -v

Java Methods

In addition to the command line interface, a Java API is provided.

Constructor

    public ChartMap(ChartOption option,
                    String chart,
                    String outputFilename,
                    String helmHome,
                    String envFilename,
                    boolean refresh,
                    boolean verbose)
                    

Description

Constructs a new instance of the org.alfresco.deployment.util.ChartMap class

Parameters

• option
  • The format of the Helm Chart
• chart
  • The name of the Helm Chart in one of the formats specified by the option parameter
• outputFilename
  • The name of the file to which to write the generated Chart Map. Note the file is overwritten if it exists.
• helmHome
  • The location of Helm Home
• envSpecFilename
  • The location of an Environment Specification which is a yaml file containing a list of environment variables to set before rendering helm templates, or . See the example environment specification provided in resource/example-env-spec.yaml to understand the format.
• refresh
  • When true, refresh the local Helm repo (default false)
• verbose
  • When true, provides a little more information as the Chart Map is generated (default false)

Throws

• java.lang.Exception

print

Description

Prints a ChartMap

    public void print ()
                    

Throws

• java.io.Exception

Java Example

import org.alfresco.deployment.util.ChartMap;
import org.alfresco.deployment.util.ChartOption;

public class ChartMapExample {
    public static void printExampleChartMap(String[] args) {
        try {
            ChartMap testMap = new ChartMap(
                    ChartOption.FILENAME,
                    "src/test/resource/testChartFile.tgz",
                    "my-chartmap.puml",
                    System.getenv("HELM_HOME"),
                    "resource/example/example-env-spec.yaml",
                    false,
                    true);
            testMap.print();
        } catch (Exception e) {
            System.out.println("Exception generating chart map: " + e.getMessage());
        }
    }
}

More examples illustrating the use of the Java interface can be found in ChartMapTest.java.

Examples of Generated Files

Example Image generated from a PlantUML file generated by Chartmap

Note that the colors chosen for a chart are randomly selected from a standard set of PlantUML colors (see PlantUML Colors) using a method that will depict Helm Charts or Docker Files that differ only by their version using the same color. For example 'postgresql:0.8.5' and 'postgresql:0.8.7' will be depicted with the same color. This will make it easier to spot cases you may want to optimize a deployment to use a common Helm Chart or Docker Image instead.

Helm Charts are depicted as rectangular objects. Docker Images are depicted as ovals.

Dependencies of Helm Charts on other Helm Charts are shown as green lines. Dependencies of Helm Charts on Docker Images are shown as orange lines.

Example PlantUML File generated by Chartmap

Example PlantUML File

Example JSON File generated by Chartmap

Example JSON File

Example Text File generated by Chartmap

Example Text File

Architecture Overview

A illustrated, there is a Chartmap component, implemented as a Java class, that reads in a Helm Chart from a Helm Chart source. It then relies on the use of the helm template command to recursively generate a template representation of a Helm Chart and its dependencies. The resulting templates are parsed and the information saved in an in-memory representation of the Helm Chart and its dependencies, using a model of each of the main elements of Helm, such as HelmChart and HelmDeploymentContainer.

The result is then used to generate a file representation of the Helm Chart using one of several ChartMapPrinter classes, such as the PlantUMLChartMapPrinter. The end-user can then enjoy the result using an image viewer, a text viewer or helm-inspector.

Maven Commands

Building the jar from source and running tests

1. git clone this repository
2. Run Maven

mvn clean install 

Note: The prebuilt jar that is included in the ./resources directory targets Java 8 for the widest compatibiity. You can target a different version of Java by modifying the configuration in the maven-compiler-plugin to use a different target like in the example below.

<target>11</target>

Building Image files from PUML source

1. Git clone this repository
2. Copy any PUML files into the source directory
3. Run Maven

mvn com.github.jeluard:plantuml-maven-plugin:generate

Generating Images from PlantUML files outside of Maven

Having generated some PlantUML files, if you want to generate image files from the PlantUML files outside of Maven, there are several options.

• Use the online PlantUML Service. Just copy/paste the generated PlantUML text and click 'Submit'. Then you can view the resulting image as PNG, SVG or Ascii Art.
• Download the PlantUML jar and use the command line like this ...

java -DPLANTUML_LIMIT_SIZE=8192 -jar ~/Downloads/plantuml.jar alfresco-dbp-0.8.0.puml

• Build PlantUML from source and then use the command line like this ...

java -DPLANTUML_LIMIT_SIZE=8192 -jar ~/IdeaProjects/plantuml/target/plantuml-1.2018.11-SNAPSHOT.jar -tsvg alfresco-dbp-0.8.0.puml

Notes about a local deployment of PlantUML:

• Setting the optional property PLANTUML_LIMIT_SIZE=8192 as illustrated in the above examples is useful when creating large images to avoid image truncation.
• Graphviz is a prerequisite

Issues

If you find any problems please open an issue.

License

Apache 2.0