Opentracing bridge

.travis.yml

@@ -5,6 +5,7 @@ env:
   matrix:
     - TEST_DIR=api
     - TEST_DIR=sdk
+    - TEST_DIR=bridges/opentracing
 rvm:
   - 2.4
   - 2.5
@@ -13,4 +14,4 @@ rvm:
   - truffleruby
 
 install: ( cd api && bundle install --jobs=3 --retry=3 )
-script: ( cd $TEST_DIR && rake )
+script: ( if [ $TEST_DIR=='bridges/opentracing' ]; then gem install opentracing -v 0.5.0; fi && cd $TEST_DIR && rake )

bridges/opentracing/.rubocop.yml

@@ -0,0 +1,13 @@
+AllCops:
+  TargetRubyVersion: '2.4.0'
+
+Metrics/LineLength:
+  Enabled: false
+Metrics/ParameterLists:
+  Enabled: false
+Metrics/MethodLength:
+  Max: 20
+Style/ModuleFunction:
+  Enabled: false
+Lint/UnusedMethodArgument:
+  Enabled: false

bridges/opentracing/Gemfile

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+# Copyright 2019 OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+source 'https://rubygems.org'
+
+gemspec

bridges/opentracing/LICENSE

@@ -0,0 +1,201 @@
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bridges/opentracing/Rakefile

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+# Copyright 2019 OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+require 'bundler/gem_tasks'
+require 'rake/testtask'
+require 'yard'
+
+require 'rubocop/rake_task'
+RuboCop::RakeTask.new
+
+Rake::TestTask.new :test do |t|
+  t.libs << 'test'
+  t.libs << 'lib'
+  t.libs << '../../api/lib'
+  t.test_files = FileList['test/**/*_test.rb']
+end
+
+YARD::Rake::YardocTask.new do |t|
+  files = Dir.glob('./lib/**/*.rb')
+
+  # Move ./lib/opentelemetry/bridge/opentracing.rb to the end of the array.
+  # Otherwise other files will overwrite the OpenTelemetryBridge module
+  # comments with the license information.
+  ots_index = files.index('./lib/opentelemetry/bridge/opentracing.rb')
+  files = files.insert(-1, files.delete_at(ots_index))
+
+  t.files = files # optional
+  t.options = ['--output-dir', 'docs/opentracingbridge'] # optional
+  t.stats_options = ['--list-undoc'] # optional
+end
+
+if RUBY_ENGINE == 'truffleruby'
+  task default: %i[test]
+else
+  task default: %i[test rubocop yard]
+end

bridges/opentracing/lib/opentelemetry/bridge/opentracing.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Copyright 2019 OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+require 'opentracing'
+require 'opentelemetry'
+
+module OpenTelemetry
+  module Bridge
+    # OpenTracing Bridge provides a means of converting
+    # from OpenTelemetry to OpenTracing objects
+    OT = OpenTracing
+    module OpenTracing
+      FORMAT_TEXT_MAP = OT::FORMAT_TEXT_MAP
+      FORMAT_RACK = OT::FORMAT_RACK
+    end
+  end
+end
+
+require 'opentelemetry/bridge/opentracing/scope_manager'
+require 'opentelemetry/bridge/opentracing/scope'
+require 'opentelemetry/bridge/opentracing/span_context'
+require 'opentelemetry/bridge/opentracing/span'
+require 'opentelemetry/bridge/opentracing/tracer'
+require 'opentelemetry/bridge/opentracing/version'

bridges/opentracing/lib/opentelemetry/bridge/opentracing/scope.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+# Copyright 2019 OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+module OpenTelemetry
+  module Bridge
+    module OpenTracing
+      # Scope provides a means of referencing an OTelemetry Tracer's Context as
+      # an OTracing scope
+      class Scope < OT::Scope
+        def initialize(tracer = nil)
+          @tracer = tracer || OpenTelemetry::Trace::Tracer.new
+        end
+
+        def span
+          @tracer.current_span
+        end
+
+        def close
+          @tracer.current_span.finish
+        end
+      end
+    end
+  end
+end

bridges/opentracing/lib/opentelemetry/bridge/opentracing/scope_manager.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+# Copyright 2019 OpenTelemetry Authors
+#
+# SPDX-License-Identifier: Apache-2.0
+
+module OpenTelemetry
+  module Bridge
+    module OpenTracing
+      # A ScopeManager provides an API for interfacing with
+      # OpenTelemetry Tracers and Spans as OpenTracing objects
+      class ScopeManager < OT::ScopeManager
+        def initialize(tracer)
+          @tracer = tracer
+        end
+
+        # Activate the given span
+        #
+        # @param [Span] span An OpenTelemetry Span
+        # @return [Span]
+        def activate(span, finish_on_close: true)
+          Span.new(@tracer.with_span(span))
+        end
+
+        # Get the active span as a OpenTracingBridge::Span
+        #
+        # @return [Span]
+        def active
+          Span.new(@tracer.current_span)
+        end
+      end
+    end
+  end
+end