Add tracing support for GraphQL objects, interfaces and subscriptions

Cargo.toml

@@ -5,6 +5,7 @@ members = [
   "juniper_codegen",
   "juniper",
   "examples/basic_subscriptions",
+  "examples/tracing_support",
   "examples/warp_async",
   "examples/warp_subscriptions",
   "examples/actix_subscriptions",

docs/book/content/SUMMARY.md

@@ -25,6 +25,8 @@
     - [Hyper](servers/hyper.md)
   - [Third Party Integrations](servers/third-party.md)
 
+- [Tracing](tracing/index.md)
+
 - [Advanced Topics](advanced/index.md)
 
   - [Introspection](advanced/introspection.md)

docs/book/content/advanced/implicit_and_explicit_null.md

@@ -69,7 +69,7 @@ In Juniper, this can be done using the `Nullable` type:
 # extern crate juniper;
 use juniper::{FieldResult, Nullable};
 
-#[derive(juniper::GraphQLInputObject)]
+#[derive(Debug, juniper::GraphQLInputObject)]
 struct UserPatchInput {
     pub favorite_number: Nullable<i32>,
     pub least_favorite_number: Nullable<i32>,

docs/book/content/quickstart.md

@@ -39,7 +39,7 @@ use juniper::{
 #     fn insert_human(&self, _human: &NewHuman) -> FieldResult<Human> { Err("")? }
 # }
 
-#[derive(GraphQLEnum)]
+#[derive(Debug, GraphQLEnum)]
 enum Episode {
     NewHope,
     Empire,
@@ -57,7 +57,7 @@ struct Human {
 
 // There is also a custom derive for mapping GraphQL input objects.
 
-#[derive(GraphQLInputObject)]
+#[derive(Debug, GraphQLInputObject)]
 #[graphql(description = "A humanoid creature in the Star Wars universe")]
 struct NewHuman {
     name: String,