Add hanami app to integration CI configurations (#3639)

What does this PR do?

Adds hanami to CI configurations, as requested in #2546.

Several things needed to be fixed for the tests to pass:

Fix hanami integration app dependencies #2546
There was an empty hanami.rb which looks to have been intended to mock Hanami framework (?). The app requires the actual hanami framework to function and this empty file was loaded instead of hanami itself. I removed the file.
Hanami integration app was missing unicorn configuration, which the test suite was expecting. I copied it from sinatra.
The controller in the test app was written to fail 50% of the time, presumably to provide an environment to test failure. I commented out the failure generation so that CI would pass every time.
I also made the image build script work when ruby version isn't given and to provide a help message so that someone new to this area of the code could actually get it running locally.

Motivation:

Review of #2546.

Test plan
The tests are running on Ruby 2.6 and 2.7 only. Hanami 1 (1.3.5, more exactly) that is currently being used in these tests is not compatible with Ruby 3.


Co-authored-by: Oleg Pudeyev <code@olegp.name>
Co-authored-by: Tony Hsu <tonyc.t.hsu@gmail.com>

Author: 3 people

.circleci/config.yml

@@ -531,12 +531,12 @@ workflows:
           <<: *filters_all_branches_and_tags
       - orb/build_and_test_integration:
           name: build_and_test_integration-2.6
-          integration_apps: 'rack rails-five rails-six sinatra2-classic sinatra2-modular'
+          integration_apps: 'rack rails-five rails-six sinatra2-classic sinatra2-modular hanami'
           ruby_version: '2.6'
           <<: *filters_all_branches_and_tags
       - orb/build_and_test_integration:
           name: build_and_test_integration-2.7
-          integration_apps: 'rack rails-five rails-six rails-seven sinatra2-classic sinatra2-modular'
+          integration_apps: 'rack rails-five rails-six rails-seven sinatra2-classic sinatra2-modular hanami'
           ruby_version: '2.7'
           <<: *filters_all_branches_and_tags
       - orb/build_and_test_integration:

.dockerignore

@@ -0,0 +1,8 @@
+# Integration tests that run in docker should not receive the gemfile lock
+# files that aren't checked into git, because these lock files are dependent
+# on the system set of installed software which is different between the
+# host and the docker container.
+#
+# Gemfile lock files that *are* checked into git should be in docker
+# containers also.
+Gemfile.lock

integration/apps/hanami/Gemfile

@@ -6,14 +6,23 @@ gem 'rake'
 gem 'hanami',       '~> 1.3'
 gem 'hanami-model', '~> 1.3'
 gem 'dry-container', '~> 0.8.0'
+gem 'dry-configurable', '~> 0.12.0'
 
 gem 'sqlite3'
 gem 'puma'
 gem 'unicorn'
 gem 'webrick'
 gem 'pry-byebug'
 
-gem 'datadog', Datadog::DemoEnv.gem_spec('datadog')[0].merge(require: 'datadog/auto_instrument')
+gem_spec = Datadog::DemoEnv.gem_spec('datadog')
+req = {require: 'datadog/auto_instrument'}
+opts = if gem_spec.last.is_a?(Hash)
+  gem_spec.pop.merge(req)
+else
+  req
+end
+gem_spec << opts
+gem 'datadog', *gem_spec
 gem 'google-protobuf', '~> 3.0'
 
 group :development do

integration/apps/hanami/apps/acme/controllers/books/show.rb

@@ -5,10 +5,12 @@ class Show
         include Acme::Action
 
         def call(params)
+=begin Uncomment for testing failures
           # binding.pry
           if rand > 0.5
             raise "Oooops...."
           end
+=end
         end
       end
     end

integration/apps/hanami/config/environment.rb

@@ -1,7 +1,6 @@
 require 'bundler/setup'
 require 'hanami/setup'
 require 'hanami/model'
-require_relative '../lib/hanami'
 require_relative '../apps/acme/application'
 
 Hanami.configure do

integration/apps/hanami/config/puma.rb

@@ -12,8 +12,6 @@
 
 preload_app!
 
-rackup DefaultRackup
-
 port ENV.fetch("PORT") { 80 }
 
 environment ENV.fetch("HANAMI_ENV") { "development" }

integration/apps/hanami/config/unicorn.rb

@@ -0,0 +1,23 @@
+require 'datadog/demo_env'
+
+# config/unicorn.rb
+worker_processes Integer(ENV["WEB_CONCURRENCY"] || 3)
+timeout 15
+preload_app true
+
+Datadog::DemoEnv.print_env('Unicorn master environment')
+
+before_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
+    Process.kill 'QUIT', Process.pid
+  end
+end
+
+after_fork do |server, worker|
+  Signal.trap 'TERM' do
+    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
+  end
+
+  Datadog::DemoEnv.print_env('Unicorn worker environment')
+end

integration/apps/hanami/lib/hanami.rb

@@ -5,9 +5,18 @@ INTEGRATION_SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1
 INTEGRATION_DIR=${INTEGRATION_SCRIPT_DIR%/script}
 cd $INTEGRATION_DIR
 
+APP_RUBY_VERSION=
+
 # Parse options
-while getopts ":v:" opt; do
+while getopts ":hv:" opt; do
   case $opt in
+    h)
+      echo "Usage: ./script/build-images [-v RUBY_VERSION]"
+      echo
+      echo "If no Ruby version is specified, images are built for each of the"
+      echo "supported versions (currently 2.1 through 3.3)."
+      exit 0
+      ;;
     v)
       APP_RUBY_VERSION=$OPTARG
       ;;
@@ -27,7 +36,7 @@ echo "== Building base images... =="
 # docker build -t datadog/dd-apm-demo:wrk -f $INTEGRATION_DIR/images/wrk/Dockerfile $INTEGRATION_DIR/images
 docker build -t datadog/dd-apm-demo:agent -f $INTEGRATION_DIR/images/agent/Dockerfile $INTEGRATION_DIR/images/agent
 
-if [[ ! -z $APP_RUBY_VERSION ]]; then
+if test -n "$APP_RUBY_VERSION"; then
   docker build -t datadog/dd-apm-demo:rb-$APP_RUBY_VERSION -f $INTEGRATION_DIR/images/ruby/$APP_RUBY_VERSION/Dockerfile $INTEGRATION_DIR/images
 else
   docker build -t datadog/dd-apm-demo:rb-2.1 -f $INTEGRATION_DIR/images/ruby/2.1/Dockerfile $INTEGRATION_DIR/images