GraphQL: Improve API interface

[amotl]

@coderabbitai told us about a TODO item it spotted within that other patch.

⚠️ Potential issue

Address the pending TODO: Extract variables and operation_name from additional sources

At line 16, there's a TODO comment indicating that variables and operation_name should be retrieved from form data, query parameters, or request text. Implementing this functionality will enhance compatibility with various GraphQL clients that send these fields in different ways.

Would you like assistance in implementing this feature?

Originally posted by @coderabbitai[bot] in #554 (comment)

[amotl]

🛠️ Refactor suggestion

Remove or refactor the commented-out code within the triple-quoted string

Lines 28-33 contain code that is commented out inside a triple-quoted string. This code appears to handle extracting the GraphQL query from form data. To improve code clarity, consider one of the following:

• Uncomment and integrate the code if form data support is required and the dependent feature in Starlette is now available.
• Remove the commented code if it's obsolete or no longer needed.

-- #554 (comment)

[amotl]

⚠️ Potential issue

Implement content-type assertions before processing req.text

At line 42, there's a TODO comment suggesting that assertions about the content-type should be made before using req.text. This is important to ensure that the server only processes requests with appropriate content types, enhancing security and robustness.

Would you like assistance in implementing content-type validation?

-- #554 (comment)

[amotl]

⚠️ Potential issue

Handle exceptions during query execution to enhance error reporting

In lines 56-58, schema.execute is called to execute the GraphQL query. If an exception occurs (e.g., due to an invalid query), it may not be properly handled, leading to uninformative error responses. Consider adding exception handling to capture errors and return meaningful feedback to the client.

Apply this diff to handle exceptions:

+        try:
             result = schema.execute(
                 query, variables=variables, operation_name=operation_name, context=context
             )
+        except Exception as e:
+            resp.status_code = 400
+            resp.media = {"errors": [str(e)]}
+            return

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

        try:
            result = schema.execute(
                query, variables=variables, operation_name=operation_name, context=context
            )
        except Exception as e:
            resp.status_code = 400
            resp.media = {"errors": [str(e)]}
            return

---

💡 Codebase verification

⚠️ Potential issue

GraphQL schema execution needs to be asynchronous

The code is using graphql-server package's synchronous execution in an async context. The schema's execute() method is being called synchronously within an async function graphql_response, which can indeed block the event loop. Looking at the implementation:

• The code imports from graphql_server, not the core graphql package
• There's no async execution method being used
• The execution is happening in an async context

To fix this:

• Either switch to graphql-core which provides async execution via graphql() function
• Or use a separate thread pool executor to run the synchronous schema.execute()

🔗 Analysis chain

Ensure schema.execute is appropriate for asynchronous context

The method schema.execute may be synchronous. Since graphql_response is an asynchronous function, using synchronous code can block the event loop. Verify if an asynchronous version like await schema.execute_async(...) is available and appropriate to use.

Run the following script to check for an asynchronous execution method:

🏁 Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Check if the schema has an async execution method.

# Expected: Find an async method like 'execute_async' in the schema's module.

# Search for 'execute_async' method definition.
ast-grep --pattern 'async def execute_async($_$) { $$$ }'

Length of output: 59

---

Script:

#!/bin/bash
# Let's try different approaches to find relevant information

# 1. Search for any imports or usage of GraphQL schema execution
rg -l "schema.*execute" --type py

# 2. Look for the schema definition and its type
rg "schema\s*=|class.*Schema" --type py

# 3. Check for any async GraphQL related imports or patterns
rg "graphql.*async|async.*graphql" --type py

# 4. Find the actual schema implementation being used
rg "from.*graphql.*import.*Schema|import.*graphql.*Schema" --type py

Length of output: 1552

---

Script:

#!/bin/bash
# Let's examine the GraphQL implementation more closely

# 1. Look at the content of the GraphQL implementation file
cat responder/ext/graphql/__init__.py

# 2. Check for any GraphQL package imports
rg "from graphql" --type py

# 3. Look for any async execution patterns in the GraphQL view
rg -A 5 "class.*GraphQLView" --type py

Length of output: 2989

-- #554 (comment)

[amotl]

🛠️ Refactor suggestion

Avoid unnecessary JSON parsing

At line 65, result is already a JSON-formatted string after encoding. Parsing it back into a Python object with json.loads(result) only to have it serialized again by resp.media introduces redundant processing. Consider assigning the original result directly to resp.text and setting the appropriate content type.

Apply this diff to eliminate unnecessary parsing:

-        resp.media = json.loads(result)
+        resp.text = result
+        resp.headers["Content-Type"] = "application/json"

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

        resp.text = result
        resp.headers["Content-Type"] = "application/json"

-- #554 (comment)

[amotl]

🛠️ Refactor suggestion

Enhance handling of variables and operation_name in _resolve_graphql_query

Currently, variables and operation_name are only extracted from JSON requests. To improve compatibility with clients that send these fields via query parameters or form data, consider extending the method to parse variables and operation_name from these sources as well.

For example, you can modify the parameter extraction logic:

     if "json" in req.mimetype:
         json_media = await req.media("json")
         return (
             json_media["query"],
-            json_media.get("variables"),
-            json_media.get("operationName"),
+            json_media.get("variables") or req.params.get("variables"),
+            json_media.get("operationName") or req.params.get("operationName"),
         )

Additionally, you may want to implement parsing for form data once it's supported.

Committable suggestion was skipped due to low confidence.

-- #554 (comment)

[amotl]

responder/ext/graphql/__init__.py (1)

66-66: Clarify the return statement or remove if unnecessary

At line 66, graphql_response returns (query, result, status_code), but the calling method on_request at line 69 doesn't use this return value. If the return value isn't needed, consider removing it to simplify the code.

Apply this diff to remove the unnecessary return value:

-        return (query, result, status_code)

If the return value is intended for future use or logging, ensure it's utilized appropriately.

-- #554 (review)

[amotl]

A final summary from #554 (comment):

Tip

For best results, initiate chat on the files or code changes.

@amotl: Thank you for your message. While I'm unable to create a separate pull request, I'd be happy to provide the suggested improvements here so you can incorporate them into your bring-back-graphql branch.

Suggested Improvements:

1. Update GraphQL Dependencies in setup.py:

   To ensure compatibility with the appropriate versions of graphene and graphql-server-core, update the extras_require section as follows:

   # In setup.py
   extras_require={
       # ...
       "graphql": ["graphene<3", "graphql-server-core>=1.2,<2"],
       # ...
   }

2. Enhance Error Handling in responder/ext/graphql/__init__.py:

   Consider adding robust error handling for GraphQL query parsing and execution to handle exceptions gracefully. This can improve the stability of the GraphQL interface.

3. Update Documentation in docs/source/tour.rst:

   Add detailed examples and usage instructions for the restored GraphQL functionality to help users integrate it seamlessly.

Please let me know if you need further assistance or specific code snippets.

With kind regards,