Visualize container dependencies from ECS task definition JSON.

graph-depends-on.pl

#!/usr/bin/env perl

use 5.12.1;
use warnings;
use JSON::PP;

my $file = shift;
open my $in, "<", $file or die $!;
my $taskdef = JSON::PP::decode_json(do { local $/ = undef; <$in> });
my $g = $file;
$g =~ s/[^\w]/_/g;
say "digraph $g {";
for my $c (@{$taskdef->{taskDefinition}->{containerDefinitions}}) {
    my $name = $c->{name};
    for my $dep (@{$c->{dependsOn}}) {
        printf qq{  %s -> %s [label = "%s"];\n},
            $name, $dep->{containerName}, $dep->{condition};
    }
}
say "}";

graph-depends-on.rb

#!/usr/bin/env ruby
require 'json'

file = ARGV[0]
taskdef = open(file) do |f|
  JSON.load(f)
end
gname = file.gsub(/[^\w]/, '_')
puts "digraph #{gname} {"
taskdef['taskDefinition']['containerDefinitions'].each do |c|
  name = c['name']
  c['dependsOn']&.each do |dep|
    puts "  #{name} -> #{dep['containerName']} [label = \"#{dep['condition']}\"];"
  end
end
puts '}'