map_reduce_spec.rb in riakpb-0.1.3

- old
+ new
@@ -1,4 +1,327 @@
 require File.expand_path("../spec_helper", File.dirname(__FILE__))
 
 describe Riak::MapReduce do
-end
\ No newline at end of file
+  before :each do
+    @client = Riak::Client.new
+    @client.rpc.stub!(:request).and_return(nil)
+    @mr = Riak::MapReduce.new(@client)
+  end
+
+  it "should require a client" do
+    lambda { Riak::MapReduce.new }.should raise_error
+    lambda { Riak::MapReduce.new(@client) }.should_not raise_error
+  end
+
+  it "should initialize the inputs and query to empty arrays" do
+    @mr.inputs.should == []
+    @mr.query.should == []
+  end
+
+  it "should yield itself when given a block on initializing" do
+    @mr2 = nil
+    @mr = Riak::MapReduce.new(@client) do |mr|
+      @mr2 = mr
+    end
+    @mr2.should == @mr
+  end
+
+  describe "adding inputs" do
+    it "should return self for chaining" do
+      @mr.add("foo", "bar").should == @mr
+    end
+
+    it "should add bucket/key pairs to the inputs" do
+      @mr.add("foo","bar")
+      @mr.inputs.should == [["foo","bar"]]
+    end
+
+    it "should add an array containing a bucket/key pair to the inputs" do
+      @mr.add(["foo","bar"])
+      @mr.inputs.should == [["foo","bar"]]
+    end
+
+    it "should add an object to the inputs by its bucket and key" do
+      bucket = Riak::Bucket.new(@client, "foo")
+      key = Riak::Key.new(bucket, "bar")
+      @mr.add(key)
+      @mr.inputs.should == [["foo", "bar"]]
+    end
+
+    it "should add an array containing a bucket/key/key-data triple to the inputs" do
+      @mr.add(["foo","bar",1000])
+      @mr.inputs.should == [["foo","bar",1000]]
+    end
+
+    it "should use a bucket name as the single input" do
+      @mr.add(Riak::Bucket.new(@client, "foo"))
+      @mr.inputs.should == "foo"
+      @mr.add("docs")
+      @mr.inputs.should == "docs"
+    end
+  end
+
+  [:map, :reduce].each do |type|
+    describe "adding #{type} phases" do
+      it "should return self for chaining" do
+        @mr.send(type, "function(){}").should == @mr
+      end
+
+      it "should accept a function string" do
+        @mr.send(type, "function(){}")
+        @mr.query.should have(1).items
+        phase = @mr.query.first
+        phase.function.should == "function(){}"
+        phase.type.should == type
+      end
+
+      it "should accept a function and options" do
+        @mr.send(type, "function(){}", :keep => true)
+        @mr.query.should have(1).items
+        phase = @mr.query.first
+        phase.function.should == "function(){}"
+        phase.type.should == type
+        phase.keep.should be_true
+      end
+
+      it "should accept a module/function pair" do
+        @mr.send(type, ["riak","mapsomething"])
+        @mr.query.should have(1).items
+        phase = @mr.query.first
+        phase.function.should == ["riak", "mapsomething"]
+        phase.type.should == type
+        phase.language.should == "erlang"
+      end
+
+      it "should accept a module/function pair with extra options" do
+        @mr.send(type, ["riak", "mapsomething"], :arg => [1000])
+        @mr.query.should have(1).items
+        phase = @mr.query.first
+        phase.function.should == ["riak", "mapsomething"]
+        phase.type.should == type
+        phase.language.should == "erlang"
+        phase.arg.should == [1000]
+      end
+    end
+  end
+
+  describe "adding link phases" do
+    it "should return self for chaining" do
+      @mr.link({}).should == @mr
+    end
+
+    it "should accept a Link" do
+      @mr.link({:tag => "next"})
+      @mr.query.should have(1).items
+      phase = @mr.query.first
+      phase.type.should == :link
+#      phase.function.should be_kind_of(Riak::WalkSpec)
+      phase.function[:tag].should == "next"
+    end
+
+    it "should accept a Link and a statement to keep" do
+      @mr.link({:bucket => "foo", :keep => true})
+      @mr.query.should have(1).items
+      phase = @mr.query.first
+      phase.type.should == :link
+#      phase.function.should be_kind_of(Riak::WalkSpec)
+      phase.function[:bucket].should == "foo"
+      phase.keep.should be_true
+    end
+  end
+
+  describe "converting to JSON for the job" do
+    it "should include the inputs and query keys" do
+      @mr.to_json.should =~ /"inputs":/
+    end
+
+    it "should map phases to their JSON equivalents" do
+      phase = Riak::MapReduce::Phase.new(:type => :map, :function => "function(){}")
+      @mr.query << phase
+      @mr.to_json.should include('"source":"function(){}"')
+      @mr.to_json.should include('"query":[{"map":{')
+    end
+
+    it "should emit only the bucket name when the input is the whole bucket" do
+      @mr.add("foo")
+      @mr.to_json.should include('"inputs":"foo"')
+    end
+
+    it "should emit an array of inputs when there are multiple inputs" do
+      @mr.add("foo","bar",1000).add("foo","baz")
+      @mr.to_json.should include('"inputs":[["foo","bar",1000],["foo","baz"]]')
+    end
+
+    it "should add the timeout value when set" do
+      @mr.timeout(50000)
+      @mr.to_json.should include('"timeout":50000')
+    end
+  end
+=begin
+  describe "executing the map reduce job" do
+    it "should issue POST request to the mapred endpoint" do
+      @http.should_receive(:post).with(200, "/mapred", @mr.to_json, hash_including("Content-Type" => "application/json")).and_return({:headers => {'content-type' => ["application/json"]}, :body => "{}"})
+      @mr.run
+    end
+
+    it "should vivify JSON responses" do
+      @http.stub!(:post).and_return(:headers => {'content-type' => ["application/json"]}, :body => '{"key":"value"}')
+      @mr.run.should == {"key" => "value"}
+    end
+
+    it "should return the full response hash for non-JSON responses" do
+      response = {:code => 200, :headers => {'content-type' => ["text/plain"]}, :body => 'This is some text.'}
+      @http.stub!(:post).and_return(response)
+      @mr.run.should == response
+    end
+
+    it "should interpret failed requests with JSON content-types as map reduce errors" do
+      @http.stub!(:post).and_raise(Riak::FailedRequest.new(:post, 200, 500, {"content-type" => ["application/json"]}, '{"error":"syntax error"}'))
+      lambda { @mr.run }.should raise_error(Riak::MapReduceError)
+      begin
+        @mr.run
+      rescue Riak::MapReduceError => mre
+        mre.message.should == '{"error":"syntax error"}'
+      else
+        fail "No exception raised!"
+      end
+    end
+
+    it "should re-raise non-JSON error responses" do
+      @http.stub!(:post).and_raise(Riak::FailedRequest.new(:post, 200, 500, {"content-type" => ["text/plain"]}, 'Oops, you bwoke it.'))
+      lambda { @mr.run }.should raise_error(Riak::FailedRequest)
+    end
+  end
+=end
+end
+
+describe Riak::MapReduce::Phase do
+  before :each do
+    @fun = "function(v,_,_){ return v['values'][0]['data']; }"
+  end
+
+  it "should initialize with a type and a function" do
+    phase = Riak::MapReduce::Phase.new(:type => :map, :function => @fun, :language => "javascript")
+    phase.type.should == :map
+    phase.function.should == @fun
+    phase.language.should == "javascript"
+  end
+
+  it "should initialize with a type and an MF" do
+    phase = Riak::MapReduce::Phase.new(:type => :map, :function => ["module", "function"], :language => "erlang")
+    phase.type.should == :map
+    phase.function.should == ["module", "function"]
+    phase.language.should == "erlang"
+  end
+
+  it "should initialize with a type and a bucket/key" do
+    phase = Riak::MapReduce::Phase.new(:type => :map, :function => {:bucket => "funs", :key => "awesome_map"}, :language => "javascript")
+    phase.type.should == :map
+    phase.function.should == {:bucket => "funs", :key => "awesome_map"}
+    phase.language.should == "javascript"
+  end
+
+  it "should assume the language is erlang when the function is an array" do
+    phase = Riak::MapReduce::Phase.new(:type => :map, :function => ["module", "function"])
+    phase.language.should == "erlang"
+  end
+
+  it "should assume the language is javascript when the function is a string" do
+    phase = Riak::MapReduce::Phase.new(:type => :map, :function => @fun)
+    phase.language.should == "javascript"
+  end
+
+  it "should assume the language is javascript when the function is a hash" do
+    phase = Riak::MapReduce::Phase.new(:type => :map, :function => {:bucket => "jobs", :key => "awesome_map"})
+    phase.language.should == "javascript"
+  end
+
+  it "should accept a WalkSpec for the function when a link phase" do
+#    phase = Riak::MapReduce::Phase.new(:type => :link, :function => Riak::WalkSpec.new({}))
+#    phase.function.should be_kind_of(Riak::WalkSpec)
+  end
+
+  it "should raise an error if a WalkSpec is given for a phase type other than :link" do
+#    lambda { Riak::MapReduce::Phase.new(:type => :map, :function => Riak::WalkSpec.new({})) }.should raise_error(ArgumentError)
+  end
+
+  describe "converting to JSON for the job" do
+    before :each do
+      @phase = Riak::MapReduce::Phase.new(:type => :map, :function => "")
+    end
+
+    [:map, :reduce].each do |type|
+      describe "when a #{type} phase" do
+        before :each do
+          @phase.type = type
+        end
+
+        it "should be an object with a single key of '#{type}'" do
+          @phase.to_json.should =~ /^\{"#{type}":/
+        end
+
+        it "should include the language" do
+          @phase.to_json.should =~ /"language":/
+        end
+
+        it "should include the keep value" do
+          @phase.to_json.should =~ /"keep":false/
+          @phase.keep = true
+          @phase.to_json.should =~ /"keep":true/
+        end
+
+        it "should include the function source when the function is a source string" do
+          @phase.function = "function(v,_,_){ return v; }"
+          @phase.to_json.should include(@phase.function)
+          @phase.to_json.should =~ /"source":/
+        end
+
+        it "should include the function name when the function is not a lambda" do
+          @phase.function = "Riak.mapValues"
+          @phase.to_json.should include('"name":"Riak.mapValues"')
+          @phase.to_json.should_not include('"source"')
+        end
+        
+        it "should include the bucket and key when referring to a stored function" do
+          @phase.function = {:bucket => "design", :key => "wordcount_map"}
+          @phase.to_json.should include('"bucket":"design"')
+          @phase.to_json.should include('"key":"wordcount_map"')
+        end
+
+        it "should include the module and function when invoking an Erlang function" do
+          @phase.function = ["riak_mapreduce", "mapreduce_fun"]
+          @phase.to_json.should include('"module":"riak_mapreduce"')
+          @phase.to_json.should include('"function":"mapreduce_fun"')
+        end
+      end
+    end
+
+    describe "when a link phase" do
+      before :each do
+        @phase.type = :link
+        @phase.function = {}
+      end
+
+      it "should be an object of a single key 'link'" do
+        @phase.to_json.should    == "{\"link\":{\"keep\":false}}"
+      end
+
+      it "should include the bucket" do
+        @phase.function[:bucket]  = "foo"
+        @phase.to_json.should    == "{\"link\":{\"bucket\":\"foo\",\"keep\":false}}"
+      end
+
+      it "should include the tag" do
+        @phase.function[:tag]     = "parent"
+        @phase.to_json.should    == "{\"link\":{\"tag\":\"parent\",\"keep\":false}}"
+      end
+
+      it "should include the keep value" do
+        @phase.keep               = true
+        @phase.to_json.should    == "{\"link\":{\"keep\":true}}"
+        @phase.keep               = false
+        @phase.function[:keep]    = true
+        @phase.to_json.should    == "{\"link\":{\"keep\":false}}"
+      end
+    end
+  end
+end