Initial implementation with middleware collecting basic metrics

.github/workflows/release.yml

@@ -0,0 +1,82 @@
+name: Publish release and push gem to RubyGems
+
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0 # Fetch current tag as annotated. See https://github.com/actions/checkout/issues/290
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.0"
+      - name: "Extract data from tag: version, message, body"
+        id: tag
+        run: |
+          git fetch --tags --force # Really fetch annotated tag. See https://github.com/actions/checkout/issues/290#issuecomment-680260080
+          echo ::set-output name=version::${GITHUB_REF#refs/tags/v}
+          echo ::set-output name=subject::$(git for-each-ref $GITHUB_REF --format='%(contents:subject)')
+          BODY="$(git for-each-ref $GITHUB_REF --format='%(contents:body)')"
+          # Extract changelog entries between this and previous version headers
+          escaped_version=$(echo ${GITHUB_REF#refs/tags/v} | sed -e 's/[]\/$*.^[]/\\&/g')
+          changelog=$(awk "BEGIN{inrelease=0} /## \[${escaped_version}\]/{inrelease=1;next} /## \[[0-9]+\.[0-9]+\.[0-9]+.*?\]/{inrelease=0;exit} {if (inrelease) print}" CHANGELOG.md)
+          # Multiline body for release. See https://github.community/t/set-output-truncates-multiline-strings/16852/5
+          BODY="${BODY}"$'\n'"${changelog}"
+          BODY="${BODY//'%'/'%25'}"
+          BODY="${BODY//$'\n'/'%0A'}"
+          BODY="${BODY//$'\r'/'%0D'}"
+          echo "::set-output name=body::$BODY"
+          # Add pre-release option if tag name has any suffix after vMAJOR.MINOR.PATCH
+          if [[ ${GITHUB_REF#refs/tags/} =~ ^v[0-9]+\.[0-9]+\.[0-9]+.+ ]]; then
+            echo ::set-output name=prerelease::true
+          fi
+      - name: Build gem
+        run: gem build
+      - name: Calculate checksums
+        run: sha256sum yabeda-anycable-${{ steps.tag.outputs.version }}.gem > SHA256SUM
+      - name: Check version
+        run: ls -l yabeda-anycable-${{ steps.tag.outputs.version }}.gem
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ steps.tag.outputs.subject }}
+          body: ${{ steps.tag.outputs.body }}
+          draft: false
+          prerelease: ${{ steps.tag.outputs.prerelease }}
+      - name: Upload built gem as release asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: yabeda-anycable-${{ steps.tag.outputs.version }}.gem
+          asset_name: yabeda-anycable-${{ steps.tag.outputs.version }}.gem
+          asset_content_type: application/x-tar
+      - name: Upload checksums as release asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: SHA256SUM
+          asset_name: SHA256SUM
+          asset_content_type: text/plain
+      - name: Publish to GitHub packages
+        env:
+          GEM_HOST_API_KEY: Bearer ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gem push yabeda-anycable-${{ steps.tag.outputs.version }}.gem --host https://rubygems.pkg.github.com/${{ github.repository_owner }}
+      - name: Publish to RubyGems
+        env:
+          GEM_HOST_API_KEY: "${{ secrets.RUBYGEMS_API_KEY }}"
+        run: |
+          gem push yabeda-anycable-${{ steps.tag.outputs.version }}.gem

.github/workflows/test.yml

@@ -0,0 +1,45 @@
+name: Run tests
+
+on:
+  pull_request:
+  push:
+    branches:
+      - '**'
+    tags-ignore:
+      - 'v*'
+
+jobs:
+  test:
+    name: "Run tests"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - ruby: "3.0"
+          - ruby: "2.7"
+          - ruby: "2.6"
+    container:
+      image: ruby:${{ matrix.ruby }}
+      env:
+        CI: true
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/cache@v2
+        with:
+          path: vendor/bundle
+          key: bundle-${{ matrix.ruby }}-${{ hashFiles('**/*.gemspec') }}-${{ hashFiles('**/Gemfile') }}
+          restore-keys: |
+            bundle-${{ matrix.ruby }}-${{ hashFiles('**/*.gemspec') }}-${{ hashFiles('**/Gemfile') }}
+            bundle-${{ matrix.ruby }}-
+      - name: Upgrade Bundler to 2.0 (for older Rubies)
+        run: gem install bundler -v '~> 2.0'
+      - name: Bundle install
+        run: |
+          bundle config path vendor/bundle
+          bundle install
+          bundle update
+      - name: Run Rubocop
+        run: bundle exec rubocop
+      - name: Run RSpec
+        run: bundle exec rspec

.gitignore

@@ -9,3 +9,5 @@
 
 # rspec failure tracking
 .rspec_status
+
+*.gem

.rubocop.yml

@@ -1,5 +1,5 @@
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.6
 
 Style/StringLiterals:
   Enabled: true
@@ -9,5 +9,25 @@ Style/StringLiteralsInInterpolation:
   Enabled: true
   EnforcedStyle: double_quotes
 
+Style/TrailingCommaInArrayLiteral:
+  Enabled: true
+  EnforcedStyleForMultiline: consistent_comma
+
+Style/TrailingCommaInHashLiteral:
+  Enabled: true
+  EnforcedStyleForMultiline: consistent_comma
+
+Style/TrailingCommaInArguments:
+  Enabled: true
+  EnforcedStyleForMultiline: consistent_comma
+
 Layout/LineLength:
   Max: 120
+
+Metrics/BlockLength:
+  Exclude:
+    - "Gemfile"
+    - "spec/**/*"
+
+Metrics/AbcSize:
+  Max: 20

CHANGELOG.md

@@ -2,4 +2,4 @@
 
 ## [0.1.0] - 2021-07-22
 
-- Initial release
+- Initial release with `anycable_rpc_call_count` and `anycable_rpc_call_runtime` metrics in an AnyCable middleware.

Gemfile

@@ -5,6 +5,10 @@ source "https://rubygems.org"
 # Specify your gem's dependencies in yabeda-anycable.gemspec
 gemspec
 
+gem "pry"
+gem "pry-byebug"
+gem "pry-doc"
+
 gem "rake", "~> 13.0"
 
 gem "rspec", "~> 3.0"

Gemfile.lock

@@ -0,0 +1,86 @@
+PATH
+  remote: .
+  specs:
+    yabeda-anycable (0.1.0)
+      anycable-core (~> 1.1)
+      yabeda (~> 0.10)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    anycable-core (1.1.1)
+      anyway_config (>= 2.1.0)
+      google-protobuf (>= 3.13)
+    anyway_config (2.1.0)
+      ruby-next-core (>= 0.11.0)
+    ast (2.4.2)
+    byebug (11.1.3)
+    coderay (1.1.3)
+    concurrent-ruby (1.1.9)
+    diff-lcs (1.4.4)
+    dry-initializer (3.0.4)
+    google-protobuf (3.17.3-x86_64-linux)
+    method_source (1.0.0)
+    parallel (1.20.1)
+    parser (3.0.2.0)
+      ast (~> 2.4.1)
+    pry (0.14.1)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    pry-byebug (3.8.0)
+      byebug (~> 11.0)
+      pry (~> 0.10)
+    pry-doc (1.1.0)
+      pry (~> 0.11)
+      yard (~> 0.9.11)
+    rainbow (3.0.0)
+    rake (13.0.6)
+    regexp_parser (2.1.1)
+    rexml (3.2.5)
+    rspec (3.10.0)
+      rspec-core (~> 3.10.0)
+      rspec-expectations (~> 3.10.0)
+      rspec-mocks (~> 3.10.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-support (3.10.2)
+    rubocop (1.18.3)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.7.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.8.0)
+      parser (>= 3.0.1.1)
+    ruby-next-core (0.12.0)
+    ruby-progressbar (1.11.0)
+    unicode-display_width (2.0.0)
+    yabeda (0.10.0)
+      anyway_config (>= 1.3, < 3)
+      concurrent-ruby
+      dry-initializer
+    yard (0.9.26)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  pry
+  pry-byebug
+  pry-doc
+  rake (~> 13.0)
+  rspec (~> 3.0)
+  rubocop (~> 1.7)
+  yabeda-anycable!
+
+BUNDLED WITH
+   2.2.24

README.md

@@ -1,39 +1,91 @@
-# Yabeda::Anycable
+# ![Yabeda::AnyCable](./yabeda-anycable-logo.png)
 
-Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/yabeda/anycable`. To experiment with that code, run `bin/console` for an interactive prompt.
+Built-in metrics for monitoring [AnyCable] RPC server out of the box! Part of the [Yabeda] suite.
 
-TODO: Delete this and the text above, and describe your gem
+See [AnyCable architecture](https://docs.anycable.io/architecture) on details on what AnyCable RPC server is. For monitoring of [AnyCable] websocket server you will need to use [monitoring capabilities](https://docs.anycable.io/anycable-go/instrumentation) built in [anycable-go] itself.
 
 ## Installation
 
-Add this line to your application's Gemfile:
-
 ```ruby
 gem 'yabeda-anycable'
+
+# Then add monitoring system adapter, e.g.:
+# gem 'yabeda-prometheus'
+
+# If you're using Rails, don't forget to add plugin for it:
+# gem 'yabeda-rails'
+# But if not then you should run `Yabeda.configure!` manually when your app is ready.
 ```
 
 And then execute:
 
-    $ bundle install
+    $ bundle
+
+**And that is it!** AnyCable metrics are being collected!
+
+Additionally, depending on your adapter, you may want to setup metrics export. E.g. for [yabeda-prometheus]:
 
-Or install it yourself as:
+```ruby
+# config/initializers/anycable.rb or elsewhere
+AnyCable.configure_server do
+  Yabeda::Prometheus::Exporter.start_metrics_server!
+end
+```
 
-    $ gem install yabeda-anycable
+## Metrics
 
-## Usage
+- Counter of total number of RPC calls: `anycable_rpc_call_count` (segmented by `method`, `command`, and `status`)
+- Histogram of RPC call duration: `anycable_rpc_call_runtime` (seconds per RPC call execution, segmented by `method`, `command`, and `status`)
 
-TODO: Write usage instructions here
+`status` label may be one of `SUCCESS` (all is good), `FAILURE` (e.g. connection rejected), or `ERROR` (exception raised).
 
 ## Development
 
 After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
 
-To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and the created tag, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/yabeda-anycable.
+Bug reports and pull requests are welcome on GitHub at https://github.com/yabeda-rb/yabeda-anycable.
+
+### Releasing
+
+1. Bump version number in `lib/yabeda/anycable/version.rb`
+
+   In case of pre-releases keep in mind [rubygems/rubygems#3086](https://github.com/rubygems/rubygems/issues/3086) and check version with command like `Gem::Version.new(Yabeda::AnyCable::VERSION).to_s`
+
+2. Fill `CHANGELOG.md` with missing changes, add header with version and date.
+
+3. Make a commit:
+
+   ```sh
+   git add lib/yabeda/anycable/version.rb CHANGELOG.md
+   version=$(ruby -r ./lib/yabeda/anycable/version.rb -e "puts Gem::Version.new(Yabeda::AnyCable::VERSION)")
+   git commit --message="${version}: " --edit
+   ```
+
+4. Create annotated tag:
+
+   ```sh
+   git tag v${version} --annotate --message="${version}: " --edit --sign
+   ```
+
+5. Fill version name into subject line and (optionally) some description (list of changes will be taken from changelog and appended automatically)
+
+6. Push it:
+
+   ```sh
+   git push --follow-tags
+   ```
+
+7. GitHub Actions will create a new release, build and push gem into RubyGems! You're done!
 
 ## License
 
 The gem is available as open source under the terms of the [MIT License](https://opensource.org/licenses/MIT).
+
+[AnyCable]: https://anycable.io/ "Polyglot replacement for ActionCable server"
+[anycable-go]: https://github.com/anycable/anycable-go "AnyCable WebSocket server written in Go"
+[Yabeda]: https://github.com/yabeda-rb/yabeda "Extendable framework for collecting and exporting metrics from your Ruby application"
+[yabeda-prometheus]: https://github.com/yabeda-rb/yabeda-prometheus "Adapter to expose metrics collected by Yabeda plugins to Prometheus via its offical Ruby client"