refactor: create context middleware

Signed-off-by: Gustavo Inacio <[email protected]>

Author: gusinacio

crates/service/src/error.rs

@@ -17,6 +17,13 @@ use thiserror::Error;
 pub enum IndexerServiceError {
     #[error("No Tap receipt was found in the request")]
     ReceiptNotFound,
+    #[error("Could not find deployment id")]
+    DeploymentIdNotFound,
+    #[error(transparent)]
+    AxumError(#[from] axum::Error),
+
+    #[error(transparent)]
+    SerializationError(#[from] serde_json::Error),
 
     #[error("Issues with provided receipt: {0}")]
     ReceiptError(#[from] tap_core::Error),
@@ -45,6 +52,9 @@ impl IntoResponse for IndexerServiceError {
 
             ReceiptError(_) | EscrowAccount(_) | ProcessingError(_) => StatusCode::BAD_REQUEST,
             ReceiptNotFound => StatusCode::PAYMENT_REQUIRED,
+            DeploymentIdNotFound => StatusCode::INTERNAL_SERVER_ERROR,
+            AxumError(_) => StatusCode::BAD_REQUEST,
+            SerializationError(_) => StatusCode::BAD_REQUEST,
         };
         tracing::error!(%self, "An IndexerServiceError occoured.");
         (

crates/service/src/middleware.rs

@@ -3,6 +3,7 @@
 
 pub mod auth;
 mod inject_allocation;
+mod inject_context;
 mod inject_deployment;
 mod inject_labels;
 mod inject_receipt;

crates/service/src/middleware/inject_context.rs

@@ -0,0 +1,125 @@
+// Copyright 2023-, Edge & Node, GraphOps, and Semiotic Labs.
+// SPDX-License-Identifier: Apache-2.0
+
+//! Injects tap context to be used by the checks
+//!
+//! Requires Deployment Id extension to available
+
+use serde_json::value::RawValue;
+use std::sync::Arc;
+
+use axum::{
+    body::to_bytes,
+    extract::{Path, Request},
+    middleware::Next,
+    response::Response,
+    RequestExt,
+};
+use tap_core::receipt::Context;
+use thegraph_core::DeploymentId;
+
+use crate::{error::IndexerServiceError, tap::AgoraQuery};
+
+#[derive(Debug, serde::Deserialize, serde::Serialize)]
+struct QueryBody {
+    query: String,
+    variables: Option<Box<RawValue>>,
+}
+
+pub async fn context_middleware(
+    mut request: Request,
+    next: Next,
+) -> Result<Response, IndexerServiceError> {
+    let deployment_id = match request.extensions().get::<DeploymentId>() {
+        Some(deployment) => *deployment,
+        None => match request.extract_parts::<Path<DeploymentId>>().await {
+            Ok(Path(deployment)) => deployment,
+            Err(_) => return Err(IndexerServiceError::DeploymentIdNotFound),
+        },
+    };
+
+    let (mut parts, body) = request.into_parts();
+    let bytes = to_bytes(body, usize::MAX).await?;
+    let query_body: QueryBody = serde_json::from_slice(&bytes)?;
+
+    let variables = query_body
+        .variables
+        .as_ref()
+        .map(ToString::to_string)
+        .unwrap_or_default();
+
+    let mut ctx = Context::new();
+    ctx.insert(AgoraQuery {
+        deployment_id,
+        query: query_body.query.clone(),
+        variables,
+    });
+    parts.extensions.insert(Arc::new(ctx));
+    let request = Request::from_parts(parts, bytes.into());
+    Ok(next.run(request).await)
+}
+
+#[cfg(test)]
+mod tests {
+    use std::sync::Arc;
+
+    use axum::{
+        body::Body,
+        http::{Extensions, Request},
+        middleware::from_fn,
+        routing::get,
+        Router,
+    };
+    use reqwest::StatusCode;
+    use tap_core::receipt::Context;
+    use test_assets::ESCROW_SUBGRAPH_DEPLOYMENT;
+    use tower::ServiceExt;
+
+    use crate::{
+        middleware::inject_context::{context_middleware, QueryBody},
+        tap::AgoraQuery,
+    };
+
+    #[tokio::test]
+    async fn test_context_middleware() {
+        let middleware = from_fn(context_middleware);
+        let deployment = *ESCROW_SUBGRAPH_DEPLOYMENT;
+        let query_body = QueryBody {
+            query: "hello".to_string(),
+            variables: None,
+        };
+        let body = serde_json::to_string(&query_body).unwrap();
+
+        let handle = move |extensions: Extensions| async move {
+            let ctx = extensions
+                .get::<Arc<Context>>()
+                .expect("Should contain context");
+            let agora = ctx.get::<AgoraQuery>().expect("should contain agora query");
+            assert_eq!(agora.deployment_id, deployment);
+            assert_eq!(agora.query, query_body.query);
+
+            let variables = query_body
+                .variables
+                .as_ref()
+                .map(ToString::to_string)
+                .unwrap_or_default();
+            assert_eq!(agora.variables, variables);
+            Body::empty()
+        };
+
+        let app = Router::new().route("/", get(handle)).layer(middleware);
+
+        let res = app
+            .oneshot(
+                Request::builder()
+                    .uri("/")
+                    .extension(deployment)
+                    .extension(deployment)
+                    .body(body)
+                    .unwrap(),
+            )
+            .await
+            .unwrap();
+        assert_eq!(res.status(), StatusCode::OK);
+    }
+}