use self_cell

cynic-codegen/Cargo.toml

@@ -23,13 +23,14 @@ counter = "0.5"
 darling.workspace = true
 graphql-parser = "0.4.0"
 once_cell = "1.9.0"
-ouroboros = "0.18"
 proc-macro2 = "1.0"
 quote = "1.0"
+self_cell = { version = "1" }
 strsim = "0.10.0"
 syn = { workspace = true , features = ["visit-mut"] }
 thiserror = "1"
 
+# Optional deps
 rkyv = { version = "0.7.41", features = ["validation"], optional = true }
 
 [dev-dependencies]

cynic-codegen/src/schema/type_index/optimised.rs

@@ -2,6 +2,7 @@
 use std::collections::HashMap;
 
 use rkyv::Deserialize;
+use self_cell::self_cell;
 
 use crate::schema::{
     self,
@@ -31,19 +32,35 @@ impl Schema<'_, schema::Validated> {
     }
 }
 
-#[ouroboros::self_referencing]
+self_cell! {
+    struct AstCell {
+        owner: Vec<u8>,
+
+        #[covariant]
+        dependent: ArchiveRef,
+    }
+}
+
+type ArchiveRef<'a> = &'a ArchivedOptimisedTypes<'static>;
+
 pub struct ArchiveBacked {
-    data: Vec<u8>,
-    #[borrows(data)]
-    archived: &'this ArchivedOptimisedTypes<'static>,
+    data: AstCell,
 }
 
 impl ArchiveBacked {
     pub fn from_checked_data(data: Vec<u8>) -> Self {
-        ArchiveBacked::new(data, |data| unsafe {
-            // This is safe so long as we've already verified data
-            rkyv::archived_root::<OptimisedTypes<'_>>(&data[..])
-        })
+        ArchiveBacked {
+            data: AstCell::new(data, |data| {
+                unsafe {
+                    // This is safe so long as we've already verified data
+                    rkyv::archived_root::<OptimisedTypes<'_>>(&data[..])
+                }
+            }),
+        }
+    }
+
+    fn archive(&self) -> ArchiveRef<'_> {
+        self.data.borrow_dependent()
     }
 }
 
@@ -55,7 +72,7 @@ impl super::TypeIndex for ArchiveBacked {
 
     fn lookup_valid_type<'a>(&'a self, name: &str) -> Result<Type<'a>, SchemaError> {
         Ok(self
-            .borrow_archived()
+            .archive()
             .types
             .get(name)
             .ok_or_else(|| SchemaError::CouldNotFindType {
@@ -67,15 +84,15 @@ impl super::TypeIndex for ArchiveBacked {
 
     fn root_types(&self) -> Result<schema::types::SchemaRoots<'_>, SchemaError> {
         Ok(self
-            .borrow_archived()
+            .archive()
             .schema_roots
             .deserialize(&mut rkyv::Infallible)
             .expect("infallible"))
     }
 
     fn unsafe_lookup<'a>(&'a self, name: &str) -> Option<Type<'a>> {
         Some(
-            self.borrow_archived()
+            self.archive()
                 .types
                 .get(name)
                 .unwrap()
@@ -85,7 +102,7 @@ impl super::TypeIndex for ArchiveBacked {
     }
 
     fn unsafe_iter<'a>(&'a self) -> Box<dyn Iterator<Item = Type<'a>> + 'a> {
-        Box::new(self.borrow_archived().types.values().map(|archived_type| {
+        Box::new(self.archive().types.values().map(|archived_type| {
             archived_type
                 .deserialize(&mut rkyv::Infallible)
                 .expect("infallible")

cynic-codegen/src/schema/type_index/schema_backed.rs

@@ -5,6 +5,7 @@ use std::{
 };
 
 use once_cell::sync::Lazy;
+use self_cell::self_cell;
 
 use crate::schema::{
     names::FieldName,
@@ -13,15 +14,22 @@ use crate::schema::{
     SchemaError,
 };
 
-#[ouroboros::self_referencing]
+type TypeMap<'a> = HashMap<&'a str, &'a TypeDefinition>;
+
+self_cell! {
+    struct DocumentCell {
+        owner: Document,
+
+        #[covariant]
+        dependent: TypeMap,
+    }
+}
+
 pub struct SchemaBackedTypeIndex {
-    document: Document,
     query_root: String,
     mutation_root: Option<String>,
     subscription_root: Option<String>,
-    #[borrows(document)]
-    #[covariant]
-    types: HashMap<&'this str, &'this TypeDefinition>,
+    data: DocumentCell,
 }
 
 impl SchemaBackedTypeIndex {
@@ -41,12 +49,11 @@ impl SchemaBackedTypeIndex {
             }
         }
 
-        SchemaBackedTypeIndex::new(
-            document,
+        SchemaBackedTypeIndex {
             query_root,
             mutation_root,
             subscription_root,
-            |document| {
+            data: DocumentCell::new(document, |document| {
                 let mut types = HashMap::new();
                 for definition in &document.definitions {
                     if let Definition::TypeDefinition(type_def) = definition {
@@ -57,8 +64,12 @@ impl SchemaBackedTypeIndex {
                     types.insert(name_for_type(def), def);
                 }
                 types
-            },
-        )
+            }),
+        }
+    }
+
+    fn borrow_types(&self) -> &HashMap<&str, &TypeDefinition> {
+        self.data.borrow_dependent()
     }
 }
 
@@ -82,17 +93,15 @@ impl super::TypeIndex for SchemaBackedTypeIndex {
 
     fn root_types(&self) -> Result<SchemaRoots<'_>, SchemaError> {
         Ok(SchemaRoots {
-            query: self
-                .lookup_valid_type(self.borrow_query_root())?
-                .try_into()?,
+            query: self.lookup_valid_type(&self.query_root)?.try_into()?,
             mutation: self
-                .borrow_mutation_root()
+                .mutation_root
                 .as_ref()
                 .map(|name| ObjectType::try_from(self.lookup_valid_type(name)?))
                 .transpose()?
                 .or_else(|| ObjectType::try_from(self.lookup_valid_type("Mutation").ok()?).ok()),
             subscription: self
-                .borrow_subscription_root()
+                .subscription_root
                 .as_ref()
                 .map(|name| ObjectType::try_from(self.lookup_valid_type(name)?))
                 .transpose()?