• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

Key Technical Changes

1. Scope.GetSpan() Mutex Protection: The GetSpan() method in scope.go now uses a read lock (sync.RWMutex) to protect access to the span field. This ensures thread-safe access when multiple goroutines might be reading the span concurrently.
2. HTTPTransport.Close() Safe Channel Closing: The Close() method in transport.go now uses sync.Once to ensure that the done channel is closed only once. This prevents panics that could occur if Close() was called multiple times, potentially from different goroutines.
3. HTTPTransport Close Test: A new test case, TestHTTPTransport_CloseMultipleTimes, is added to transport_test.go to verify that calling Close() multiple times on an HTTPTransport instance does not result in a panic.

Architecture Decisions

The architectural decisions involve using standard Go concurrency primitives (sync.RWMutex and sync.Once) to address the identified issues. This approach avoids introducing external dependencies and aligns with the existing concurrency patterns within the SDK.

Dependencies and Interactions

These changes primarily affect the internal workings of the Scope and HTTPTransport structs. The Scope changes impact any code that concurrently accesses the span field. The HTTPTransport changes affect the shutdown process of the transport, ensuring that the done channel is closed safely. There are no new external dependencies introduced.

Risk Considerations

The addition of mutexes in Scope.GetSpan() could potentially introduce performance overhead, although it is expected to be minimal due to the read-heavy nature of the operation. The HTTPTransport changes are low-risk, as they primarily address a potential panic scenario and do not alter the core event sending logic. Reviewers should pay special attention to the locking strategy in Scope.GetSpan() to ensure it doesn't introduce unintended contention.

Notable Implementation Details

The use of sync.Once in HTTPTransport.Close() is a standard pattern for ensuring that a function is executed only once, even when called concurrently. The test case TestHTTPTransport_CloseMultipleTimes provides explicit verification of the fix for the double-close issue.