feat: blob exists query

crates/client/assets/schema.sdl

@@ -871,6 +871,12 @@ type Query {
 		"""
 		id: BlobId!
 	): Blob
+	blobExists(
+		"""
+		ID of the Blob
+		"""
+		id: BlobId!
+	): Boolean!
 	block(
 		"""
 		ID of the block

crates/client/src/client.rs

@@ -77,7 +77,10 @@ use pagination::{
 };
 use schema::{
     balance::BalanceArgs,
-    blob::BlobByIdArgs,
+    blob::{
+        BlobByIdArgs,
+        BlobExistsArgs,
+    },
     block::BlockByIdArgs,
     coins::CoinByIdArgs,
     contract::ContractByIdArgs,
@@ -887,6 +890,13 @@ impl FuelClient {
         Ok(blob)
     }
 
+    /// Check whether a blob with ID exists
+    pub async fn blob_exists(&self, id: BlobId) -> io::Result<bool> {
+        let query =
+            schema::blob::BlobExistsQuery::build(BlobExistsArgs { id: id.into() });
+        Ok(self.query(query).await?.blob_exists)
+    }
+
     /// Retrieve multiple blocks
     pub async fn blocks(
         &self,

crates/client/src/client/schema/blob.rs

@@ -26,3 +26,20 @@ pub struct Blob {
     pub id: BlobId,
     pub bytecode: HexString,
 }
+
+#[derive(cynic::QueryVariables, Debug)]
+pub struct BlobExistsArgs {
+    pub id: BlobId,
+}
+
+/// GraphQL query to check if a Blob exists by its ID
+#[derive(cynic::QueryFragment, Clone, Debug)]
+#[cynic(
+    schema_path = "./assets/schema.sdl",
+    graphql_type = "Query",
+    variables = "BlobExistsArgs"
+)]
+pub struct BlobExistsQuery {
+    #[arguments(id: $id)]
+    pub blob_exists: bool,
+}

crates/fuel-core/src/schema/blob.rs

@@ -66,4 +66,13 @@ impl BlobQuery {
             })
             .into_api_result()
     }
+
+    async fn blob_exists(
+        &self,
+        ctx: &Context<'_>,
+        #[graphql(desc = "ID of the Blob")] id: BlobId,
+    ) -> async_graphql::Result<bool> {
+        let query = ctx.read_view()?;
+        query.blob_exists(id.0).map_err(|e| e.into())
+    }
 }