Revise feat ignore_if_prev_successes to copy plugin

lib/fluent/plugin/out_copy.rb

@@ -27,20 +27,28 @@ class CopyOutput < MultiOutput
     desc 'Pass different record to each `store` plugin by specified method'
     config_param :copy_mode, :enum, list: [:no_copy, :shallow, :deep, :marshal], default: :no_copy
 
-    attr_reader :ignore_errors
+    attr_reader :ignore_errors, :ignore_if_prev_successes
 
     def initialize
       super
       @ignore_errors = []
+      @ignore_if_prev_successes = []
     end
 
     def configure(conf)
       super
 
       @copy_proc = gen_copy_proc
-      @stores.each { |store|
-        @ignore_errors << (store.arg == 'ignore_error')
+      @stores.each_with_index { |store, i|
+        if i == 0 && store.arg.include?('ignore_if_prev_success')
+          raise Fluent::ConfigError, "ignore_if_prev_success must specify 2nd or later <store> directives"
+        end
+        @ignore_errors << (store.arg.include?('ignore_error'))
+        @ignore_if_prev_successes << (store.arg.include?('ignore_if_prev_success'))
       }
+      if @ignore_errors.uniq.size == 1 && @ignore_errors.include?(true) && @ignore_if_prev_successes.include?(false)
+        log.warn "ignore_errors are specified in all <store>, but ignore_if_prev_success is not specified. Is this intended?"
+      end
     end
 
     def multi_workers_ready?
@@ -55,10 +63,15 @@ def process(tag, es)
         }
         es = m
       end
-
+      success = Array.new(outputs.size)
       outputs.each_with_index do |output, i|
         begin
-          output.emit_events(tag, @copy_proc ? @copy_proc.call(es) : es)
+          if i > 0 && success[i - 1] && @ignore_if_prev_successes[i]
+            log.debug "ignore copy because prev_success in #{output.plugin_id}", index: i
+          else
+            output.emit_events(tag, @copy_proc ? @copy_proc.call(es) : es)
+            success[i] = true
+          end
         rescue => e
           if @ignore_errors[i]
             log.error "ignore emit error in #{output.plugin_id}", error: e

test/plugin/test_out_copy.rb

@@ -2,8 +2,11 @@
 require 'fluent/test/driver/multi_output'
 require 'fluent/plugin/out_copy'
 require 'fluent/event'
+require 'flexmock/test_unit'
 
 class CopyOutputTest < Test::Unit::TestCase
+  include FlexMock::TestCase
+
   class << self
     def startup
       $LOAD_PATH.unshift File.expand_path(File.join(File.dirname(__FILE__), '..', 'scripts'))
@@ -54,6 +57,48 @@ def test_configure
     assert_equal :no_copy, d.instance.copy_mode
   end
 
+  ERRORNEOUS_IGNORE_IF_PREV_SUCCESS_CONFIG = %[
+    <store ignore_if_prev_success ignore_error>
+      @type test
+      name c0
+    </store>
+    <store ignore_if_prev_success ignore_error>
+      @type test
+      name c1
+    </store>
+    <store ignore_if_prev_success>
+      @type test
+      name c2
+    </store>
+  ]
+  def test_configure_with_errorneus_ignore_if_prev_success
+    assert_raise(Fluent::ConfigError) do
+      create_driver(ERRORNEOUS_IGNORE_IF_PREV_SUCCESS_CONFIG)
+    end
+  end
+
+  ALL_IGNORE_ERROR_WITHOUT_IGNORE_IF_PREV_SUCCESS_CONFIG = %[
+    @log_level info
+    <store ignore_error>
+      @type test
+      name c0
+    </store>
+    <store ignore_error>
+      @type test
+      name c1
+    </store>
+    <store ignore_error>
+      @type test
+      name c2
+    </store>
+  ]
+  def test_configure_all_ignore_errors_without_ignore_if_prev_success
+    d = create_driver(ALL_IGNORE_ERROR_WITHOUT_IGNORE_IF_PREV_SUCCESS_CONFIG)
+    expected = /ignore_errors are specified in all <store>, but ignore_if_prev_success is not specified./
+    matches = d.logs.grep(expected)
+    assert_equal(1, matches.length, "Logs do not contain '#{expected}' '#{d.logs}'")
+  end
+
   def test_configure_with_deep_copy_and_use_shallow_copy_mode
     d = create_driver(%[
       deep_copy true
@@ -217,5 +262,47 @@ def test_ignore_error
       end
     end
   end
+
+  IGNORE_IF_PREV_SUCCESS_CONFIG = %[
+    <store ignore_error>
+      @type test
+      name c0
+    </store>
+    <store ignore_if_prev_success ignore_error>
+      @type test
+      name c1
+    </store>
+    <store ignore_if_prev_success>
+      @type test
+      name c2
+    </store>
+  ]
+
+  def test_ignore_if_prev_success
+    d = create_driver(IGNORE_IF_PREV_SUCCESS_CONFIG)
+
+    # override to raise an error
+    d.instance.outputs[0].define_singleton_method(:process) do |tag, es|
+      raise ArgumentError, 'Failed'
+    end
+
+    # check ingore_if_prev_success functionality:
+    # 1. output 2 is succeeded.
+    # 2. output 3 is not called.
+    flexstub(d.instance.outputs[1]) do |output|
+      output.should_receive(:process).once
+    end
+    flexstub(d.instance.outputs[2]) do |output|
+      output.should_receive(:process).never
+    end
+
+    time = Time.parse("2011-01-02 13:14:15 UTC").to_i
+    assert_nothing_raised do
+      d.run(default_tag: 'test') do
+        d.feed(time, {"a"=>1})
+      end
+    end
+  end
+
 end