Initial benchmark tests for basic queries; something we can work upon…

… from here

for perf-related PRs.
- simple hello world equivalent
- with a list
- deeper query with list
- query with many root fields and list in each of them
- deeper query with many root fields and lists

To really bring out probable issues with query perf, a latency is
introduced to the data retrieval (previously it was just in-memory data fetch)

When testing against branch before PR #20 and #21, this really highlighted the problem with evaluating list fields.

In the future, more benchmarks for queries with fragments probably would be useful.

benchmarks_test.go

@@ -0,0 +1,220 @@
+package graphql_test
+
+import (
+	"testing"
+
+	"github.com/graphql-go/graphql"
+	"github.com/graphql-go/graphql/testutil"
+)
+
+// to avoid possible compiler optimization
+var benchmark_result *graphql.Result
+
+func benchmarkQuery(b *testing.B, schema graphql.Schema, query string) {
+	params := graphql.Params{
+		Schema:        testutil.StarWarsSchema,
+		RequestString: query,
+	}
+
+	var result *graphql.Result
+	for n := 0; n < b.N; n++ {
+		result = graphql.Do(params)
+	}
+	benchmark_result = result
+}
+
+func BenchmarkQuery_BasicQuery(b *testing.B) {
+	query := `
+		{
+			hero {
+				name
+			}
+		}
+	`
+	benchmarkQuery(b, testutil.StarWarsSchema, query)
+}
+
+func BenchmarkQuery_BasicQueryWithList(b *testing.B) {
+	query := `
+		{
+			hero {
+				id
+				name
+				friends {
+					id
+					name
+				}
+				appearsIn
+			}
+		}
+	`
+	benchmarkQuery(b, testutil.StarWarsSchema, query)
+}
+
+func BenchmarkQuery_DeeperQueryWithList(b *testing.B) {
+	query := `
+		{
+			hero {
+				id
+				name
+				friends {
+					id
+					name
+					friends {
+						id
+						name
+						appearsIn
+					}
+					appearsIn
+				}
+				appearsIn
+			}
+		}
+	`
+	benchmarkQuery(b, testutil.StarWarsSchema, query)
+}
+
+func BenchmarkQuery_QueryWithManyRootFieldsAndList(b *testing.B) {
+	query := `
+		{
+			hero {
+				id
+				name
+				friends {
+					name
+				}
+				appearsIn
+			}
+			vader: human(id: "1001") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+				}
+				appearsIn
+				homePlanet
+			}
+			leia: human(id: "1003") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+				}
+				appearsIn
+				homePlanet
+			}
+			threepio: droid(id: "2000") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+				}
+				appearsIn
+				PrimaryFunction
+			}
+			artoo: droid(id: "2001") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+				}
+				appearsIn
+				PrimaryFunction
+			}
+		}
+	`
+	benchmarkQuery(b, testutil.StarWarsSchema, query)
+}
+
+func BenchmarkQuery_DeeperQueryWithManyRootFieldsAndList(b *testing.B) {
+	query := `
+		{
+			hero {
+				id
+				name
+				friends {
+					name
+					friends {
+						id
+						name
+						appearsIn
+					}
+				}
+				appearsIn
+			}
+			vader: human(id: "1001") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+					friends {
+						id
+						name
+						appearsIn
+					}
+				}
+				appearsIn
+				homePlanet
+			}
+			leia: human(id: "1003") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+					friends {
+						id
+						name
+						appearsIn
+					}
+				}
+				appearsIn
+				homePlanet
+			}
+			threepio: droid(id: "2000") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+					friends {
+						id
+						name
+						appearsIn
+					}
+				}
+				appearsIn
+				PrimaryFunction
+			}
+			artoo: droid(id: "2001") {
+				id
+				name
+				friends {
+					id
+					name
+					appearsIn
+					friends {
+						id
+						name
+						appearsIn
+					}
+				}
+				appearsIn
+				PrimaryFunction
+			}
+		}
+	`
+	benchmarkQuery(b, testutil.StarWarsSchema, query)
+}

testutil/testutil.go

@@ -5,6 +5,7 @@ import (
 	"reflect"
 	"strconv"
 	"testing"
+	"time"
 
 	"github.com/graphql-go/graphql"
 	"github.com/graphql-go/graphql/language/ast"
@@ -323,18 +324,21 @@ func init() {
 }
 
 func GetHuman(id int) StarWarsChar {
+	time.Sleep(1 * time.Millisecond)
 	if human, ok := HumanData[id]; ok {
 		return human
 	}
 	return StarWarsChar{}
 }
 func GetDroid(id int) StarWarsChar {
+	time.Sleep(1 * time.Millisecond)
 	if droid, ok := DroidData[id]; ok {
 		return droid
 	}
 	return StarWarsChar{}
 }
 func GetHero(episode interface{}) interface{} {
+	time.Sleep(1 * time.Millisecond)
 	if episode == 5 {
 		return Luke
 	}