From a027ac21c773ed1bf71ec6017e5cafbd140305a2 Mon Sep 17 00:00:00 2001
From: vvakame <vvakame+dev@gmail.com>
Date: Mon, 29 Oct 2018 18:54:22 +0900
Subject: [PATCH 1/2] copy complexity to RequestContext

---
 graphql/context.go |  4 ++++
 handler/graphql.go | 19 +++++++++++--------
 2 files changed, 15 insertions(+), 8 deletions(-)

diff --git a/graphql/context.go b/graphql/context.go
index b6586e96046..a46844cb40a 100644
--- a/graphql/context.go
+++ b/graphql/context.go
@@ -17,6 +17,10 @@ type RequestContext struct {
 	RawQuery  string
 	Variables map[string]interface{}
 	Doc       *ast.QueryDocument
+
+	ComplexityLimit     int
+	OperationComplexity int
+
 	// ErrorPresenter will be used to generate the error
 	// message from errors given to Error().
 	ErrorPresenter      ErrorPresenterFunc
diff --git a/handler/graphql.go b/handler/graphql.go
index 13d013613a3..b09c344f540 100644
--- a/handler/graphql.go
+++ b/handler/graphql.go
@@ -35,7 +35,7 @@ type Config struct {
 	complexityLimit int
 }
 
-func (c *Config) newRequestContext(doc *ast.QueryDocument, query string, variables map[string]interface{}) *graphql.RequestContext {
+func (c *Config) newRequestContext(es graphql.ExecutableSchema, doc *ast.QueryDocument, op *ast.OperationDefinition, query string, variables map[string]interface{}) *graphql.RequestContext {
 	reqCtx := graphql.NewRequestContext(doc, query, variables)
 	if hook := c.recover; hook != nil {
 		reqCtx.Recover = hook
@@ -59,6 +59,12 @@ func (c *Config) newRequestContext(doc *ast.QueryDocument, query string, variabl
 		reqCtx.Tracer = &graphql.NopTracer{}
 	}
 
+	if c.complexityLimit > 0 {
+		reqCtx.ComplexityLimit = c.complexityLimit
+		operationComplexity := complexity.Calculate(es, op, variables)
+		reqCtx.OperationComplexity = operationComplexity
+	}
+
 	return reqCtx
 }
 
@@ -298,7 +304,7 @@ func GraphQL(exec graphql.ExecutableSchema, options ...Option) http.HandlerFunc
 			sendError(w, http.StatusUnprocessableEntity, err)
 			return
 		}
-		reqCtx := cfg.newRequestContext(doc, reqParams.Query, vars)
+		reqCtx := cfg.newRequestContext(exec, doc, op, reqParams.Query, vars)
 		ctx := graphql.WithRequestContext(r.Context(), reqCtx)
 
 		defer func() {
@@ -308,12 +314,9 @@ func GraphQL(exec graphql.ExecutableSchema, options ...Option) http.HandlerFunc
 			}
 		}()
 
-		if cfg.complexityLimit > 0 {
-			queryComplexity := complexity.Calculate(exec, op, vars)
-			if queryComplexity > cfg.complexityLimit {
-				sendErrorf(w, http.StatusUnprocessableEntity, "query has complexity %d, which exceeds the limit of %d", queryComplexity, cfg.complexityLimit)
-				return
-			}
+		if reqCtx.ComplexityLimit > 0 && reqCtx.OperationComplexity > cfg.complexityLimit {
+			sendErrorf(w, http.StatusUnprocessableEntity, "operation has complexity %d, which exceeds the limit of %d", operationComplexity, cfg.complexityLimit)
+			return
 		}
 
 		switch op.Operation {

From 784dc01fdb4f0759e59e32bb48814b94760ca00b Mon Sep 17 00:00:00 2001
From: vvakame <vvakame+dev@gmail.com>
Date: Mon, 29 Oct 2018 19:17:04 +0900
Subject: [PATCH 2/2] oops...

---
 handler/graphql.go   | 2 +-
 handler/websocket.go | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/handler/graphql.go b/handler/graphql.go
index b09c344f540..1e085ecd169 100644
--- a/handler/graphql.go
+++ b/handler/graphql.go
@@ -315,7 +315,7 @@ func GraphQL(exec graphql.ExecutableSchema, options ...Option) http.HandlerFunc
 		}()
 
 		if reqCtx.ComplexityLimit > 0 && reqCtx.OperationComplexity > cfg.complexityLimit {
-			sendErrorf(w, http.StatusUnprocessableEntity, "operation has complexity %d, which exceeds the limit of %d", operationComplexity, cfg.complexityLimit)
+			sendErrorf(w, http.StatusUnprocessableEntity, "operation has complexity %d, which exceeds the limit of %d", reqCtx.OperationComplexity, reqCtx.ComplexityLimit)
 			return
 		}
 
diff --git a/handler/websocket.go b/handler/websocket.go
index af7d7a5a4e4..dae262bdf3a 100644
--- a/handler/websocket.go
+++ b/handler/websocket.go
@@ -165,7 +165,7 @@ func (c *wsConnection) subscribe(message *operationMessage) bool {
 		c.sendError(message.ID, err)
 		return true
 	}
-	reqCtx := c.cfg.newRequestContext(doc, reqParams.Query, vars)
+	reqCtx := c.cfg.newRequestContext(c.exec, doc, op, reqParams.Query, vars)
 	ctx := graphql.WithRequestContext(c.ctx, reqCtx)
 
 	if c.initPayload != nil {