refactor test tasks, test:plugins now correctly run specs of installed plugins, including local ones

robustness in shutdown handling and other thread safeties

lib/logstash/pipeline.rb

@@ -43,14 +43,19 @@ class LogStash::Pipeline
     @settings = {
       "filter-workers" => 1,
     }
+
+    @run_mutex = Mutex.new
+    @ready = false
+    @started = false
+    @input_threads = []
   end # def initialize
 
   def ready?
-    return @ready
+    @run_mutex.synchronize{@ready}
   end
 
   def started?
-    return @started
+    @run_mutex.synchronize{@started}
   end
 
   def configure(setting, value)
@@ -69,14 +74,14 @@ class LogStash::Pipeline
   end
 
   def run
-    @started = true
-    @input_threads = []
+    @run_mutex.synchronize{@started = true}
 
-    start_inputs
+    # synchronize @input_threads between run and shutdown
+    @run_mutex.synchronize{start_inputs}
     start_filters if filters?
     start_outputs
 
-    @ready = true
+    @run_mutex.synchronize{@ready = true}
 
     @logger.info("Pipeline started")
     @logger.terminal("Logstash startup completed")
@@ -171,7 +176,7 @@ class LogStash::Pipeline
     begin
       plugin.run(@input_to_filter)
     rescue LogStash::ShutdownSignal
-      return
+      # ignore and quit
     rescue => e
       if @logger.debug?
         @logger.error(I18n.t("logstash.pipeline.worker-error-debug",
@@ -183,14 +188,23 @@ class LogStash::Pipeline
                              :plugin => plugin.inspect, :error => e))
       end
       puts e.backtrace if @logger.debug?
-      plugin.teardown
+      # input teardown must be synchronized since is can be called concurrently by
+      # the input worker thread and from the pipeline thread shutdown method.
+      # this means that input teardown methods must support multiple calls.
+      @run_mutex.synchronize{plugin.teardown}
       sleep 1
       retry
     end
-  rescue LogStash::ShutdownSignal
-    # nothing
   ensure
-    plugin.teardown
+    begin
+      # input teardown must be synchronized since is can be called concurrently by
+      # the input worker thread and from the pipeline thread shutdown method.
+      # this means that input teardown methods must support multiple calls.
+      @run_mutex.synchronize{plugin.teardown}
+    rescue LogStash::ShutdownSignal
+      # teardown could receive the ShutdownSignal, retry it
+      retry
+    end
   end # def inputworker
 
   def filterworker
@@ -201,6 +215,7 @@ class LogStash::Pipeline
 
         case event
         when LogStash::Event
+          # filter_func returns all filtered events, including cancelled ones
           filter_func(event).each { |e| @filter_to_output.push(e) unless e.cancelled? }
         when LogStash::FlushEvent
           # handle filter flushing here so that non threadsafe filters (thus only running one filterworker)
@@ -240,18 +255,30 @@ class LogStash::Pipeline
   def shutdown
     @input_threads.each do |thread|
       # Interrupt all inputs
-      @logger.info("Sending shutdown signal to input thread",
-                   :thread => thread)
+      @logger.info("Sending shutdown signal to input thread", :thread => thread)
+
+      # synchronize both ShutdownSignal and teardown below. by synchronizing both
+      # we will avoid potentially sending a shutdown signal when the inputworker is
+      # executing the teardown method.
+      @run_mutex.synchronize do
         thread.raise(LogStash::ShutdownSignal)
         begin
           thread.wakeup # in case it's in blocked IO or sleeping
         rescue ThreadError
         end
+      end
+    end
 
-      # Sometimes an input is stuck in a blocking I/O
-      # so we need to tell it to teardown directly
+    # sometimes an input is stuck in a blocking I/O so we need to tell it to teardown directly
     @inputs.each do |input|
-        input.teardown
+      begin
+        # input teardown must be synchronized since is can be called concurrently by
+        # the input worker thread and from the pipeline thread shutdown method.
+        # this means that input teardown methods must support multiple calls.
+        @run_mutex.synchronize{input.teardown}
+      rescue LogStash::ShutdownSignal
+        # teardown could receive the ShutdownSignal, retry it
+        retry
       end
     end
 
@@ -265,8 +292,10 @@ class LogStash::Pipeline
     return klass.new(*args)
   end
 
-  # for backward compatibility in devutils for the rspec helpers
+  # for backward compatibility in devutils for the rspec helpers, this method is not used
+  # in the pipeline anymore.
   def filter(event, &block)
+    # filter_func returns all filtered events, including cancelled ones
     filter_func(event).each { |e| block.call(e) }
   end
 

rakelib/test.rake

@@ -5,25 +5,37 @@
 # In general this is not a problem, because the most common rspec usage
 # is throw the rake task, where rspec sets this himself internally.
 ##
+require "logstash/pluginmanager/util"
+
 namespace "test" do
-  def run_rspec(*args)
+  task "setup" do
     require "logstash/environment"
     LogStash::Environment.bundler_setup!({:without => []})
     require "rspec/core/runner"
     require "rspec"
-    RSpec::Core::Runner.run([*args])
   end
 
-  task "core" do
-    exit run_rspec(Rake::FileList["spec/**/*_spec.rb"])
+  desc "run core specs"
+  task "core" => ["setup"] do
+    exit(RSpec::Core::Runner.run([Rake::FileList["spec/**/*_spec.rb"]]))
   end
 
-  task "core-fail-fast" do
-    exit run_rspec("--fail-fast", Rake::FileList["spec/**/*_spec.rb"])
+  desc "run core specs in fail-fast mode"
+  task "core-fail-fast" => ["setup"] do
+    exit(Spec::Core::Runner.run(["--fail-fast", Rake::FileList["spec/**/*_spec.rb"]]))
   end
 
-  task "plugins" do
-    exit run_rspec("--order", "rand", Rake::FileList[File.join(ENV["GEM_HOME"], "gems/logstash-*/spec/{input,filter,codec,output}s/*_spec.rb")])
+  desc "run all installed plugins specs"
+  task "plugins" => ["setup"] do
+    # grab all spec files using the live plugins gem specs. this allows correclty also running the specs
+    # of a local plugin dir added using the Gemfile :path option. before this, any local plugin spec would
+    # not be run because they were not under the vendor/bundle/jruby/1.9/gems path
+    test_files = LogStash::PluginManager.find_plugins_gem_specs.map do |spec|
+      Rake::FileList[File.join(spec.gem_dir, "spec/{input,filter,codec,output}s/*_spec.rb")]
+    end.flatten
+
+    # "--format=documentation"
+    exit(RSpec::Core::Runner.run(["--order", "rand", test_files]))
   end
 
   task "install-core" => ["bootstrap", "plugin:install-core", "plugin:install-development-dependencies"]