ctx_interface_gen.go (2)

286-287: LGTM: New SendStreamWriter method

The SendStreamWriter method is a great addition for buffered streaming support. The signature is well-designed and consistent with other methods in the interface.

Consider adding a brief comment above the method to describe its purpose and usage, similar to other methods in this interface. For example:

// SendStreamWriter sets the response body stream writer for buffered streaming

This would improve the documentation and make it easier for developers to understand the method's purpose at a glance.

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Line range hint 1-387: Summary: Successful implementation of buffered streaming support

The changes to ctx_interface_gen.go effectively introduce buffered streaming support to the Fiber v3 framework:

1. The addition of the "bufio" import provides the necessary functionality for buffered I/O operations.
2. The new SendStreamWriter method in the Ctx interface allows for setting a response body stream writer, enabling buffered streaming.

These changes align well with the PR objectives and maintain consistency with the existing Fiber API. The implementation is non-breaking and focused, adding functionality without modifying existing methods.

To fully leverage this new feature:

1. Ensure that the concrete implementation of the Ctx interface properly handles the SendStreamWriter method.
2. Update the documentation to include examples of how to use this new method for Server-Side Events (SSE) and large file downloads.
3. Consider adding unit tests that specifically target this new method to ensure its correct functionality and integration with the rest of the framework.

ctx.go (1)

1673-1679: LGTM! Consider enhancing error handling.

The implementation of SendStreamWriter looks good and aligns well with the PR objectives. It correctly uses fasthttp.StreamWriter to set the body stream writer.

Consider enhancing the error handling. Currently, the method always returns nil. You might want to capture and return any potential errors that could occur during the stream writing process. This could be done by modifying the streamWriter function signature to return an error and handling it accordingly.

-func (c *DefaultCtx) SendStreamWriter(streamWriter func(*bufio.Writer)) error {
-	c.fasthttp.Response.SetBodyStreamWriter(fasthttp.StreamWriter(streamWriter))
-
-	return nil
+func (c *DefaultCtx) SendStreamWriter(streamWriter func(*bufio.Writer) error) error {
+	return c.fasthttp.Response.SetBodyStreamWriter(fasthttp.StreamWriter(func(w *bufio.Writer) error {
+		return streamWriter(w)
+	}))
}

This change would allow for more robust error handling and propagation.

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docs/api/ctx.md (2)

1859-1862: Improve note formatting and clarity.

The note about the streamWriter function could be clearer and more detailed.

-:::note
-The argument `streamWriter` represents a function that populates
-the response body using a buffered stream writer.
-:::
+:::info
+The `streamWriter` argument is a function that receives a `*bufio.Writer` and is responsible for writing 
+the response body. The writer is buffered for performance, and its contents will be automatically 
+flushed after the function returns unless manually flushed within the function.
+:::

---

1855-1894: Add important usage notes and best practices.

The documentation should include important notes about common pitfalls and best practices.

Add the following notes section after the examples:

:::caution
Important considerations when using `SendStreamWriter`:
1. Always handle write errors as they indicate client disconnection
2. Long-running operations should periodically check for client disconnection
3. Large responses should be sent in chunks with periodic flushes
4. The writer buffer is automatically flushed when the function returns
5. The connection may be closed by the client at any time
:::

:::tip
Best practices:
1. Use `SendStreamWriter` for streaming large responses or real-time data
2. Implement proper error handling for all write operations
3. Consider using timeouts for long-running operations
4. Use periodic flushes for real-time updates
5. Clean up resources if the client disconnects early
:::

ctx_test.go (2)

4490-4490: Avoid using fixed time.Sleep in tests

Using fixed delays like time.Sleep(5 * time.Millisecond) can lead to flaky tests due to timing uncertainties on different systems. Consider using synchronization mechanisms to ensure proper timing without arbitrary sleeps.

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4511-4511: Avoid using fixed time.Sleep in tests

Using fixed delays like time.Sleep(1500 * time.Microsecond) can cause flaky tests. Consider synchronizing using channels or other synchronization primitives instead of time.Sleep.

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#!/bin/bash
# Description: Check implementation and usage patterns of SendStreamWriter

# Find the implementation
echo "Looking for SendStreamWriter implementation..."
ast-grep --pattern 'func (c *DefaultCtx) SendStreamWriter($_) $_'

# Find example usages
echo "Looking for example usages..."
rg "SendStreamWriter" -A 5 -B 5