* Update License header for all source files
- Add Apache 2.0 header to source files that did not have one.
- Update all existing headers dated to 2019 to be 2020
- Remove comma from License header to comply with the Apache 2.0
guidelines.
* Update Copyright notice
Use the standard Copyright notices outlined by the
[CNCF](https://github.com/cncf/foundation/blob/master/copyright-notices.md#copyright-notices)
* Add `Span#Error` method to simplify setting an error status and message.
* `Span#Error` should no-op on nil errors
* Record errors as a span event rather than status/attributes.
The implementation in the SDK package now relies on existing API methods.
* Add WithErrorStatus() ErrorOption to allow setting span status on error.
* Apply suggestions from code review
Co-Authored-By: Krzesimir Nowak <qdlacz@gmail.com>
* Address code review feedback
* Clean up RecordError tests
* Ensure complete and unique error type is recorded for defined types
* Avoid duplicating logic under test in tests
* Move TestError to internal/testing package, improve RecordError test scenarios
Co-authored-by: Krzesimir Nowak <qdlacz@gmail.com>
This PR removes the non-compliant ChildOf and FollowsFrom interfaces
and the Relation type, which were inherited from OpenTracing via the
initial prototype. Instead allow adding a span context to the go
context as a remote span context and use a simple algorithm for
figuring out an actual parent of the new span, which was proposed for
the OpenTelemetry specification.
Also add a way to ignore current span and remote span context in go
context, so we can force the tracer to create a new root span - a span
with a new trace ID.
That required some moderate changes in the opentracing bridge - first
reference with ChildOfRef reference type becomes a local parent, the
rest become links. This also fixes links handling in the meantime. The
downside of the approach proposed here is that we can only set the
remote parent when creating a span through the opentracing API.
Co-authored-by: Joshua MacDonald <jmacd@users.noreply.github.com>
