Pass google trace context in remote procedure calls. This allows parent-child tracing across multiple services.
Note: There is work in progress on googleapis/google-cloud-go#548 which will make this repo obsolete.
Use the intercept.EnableGRPCTracingDialOption
option to add google trace context to outgoing RPC calls
made by the gRPC client.
import "github.com/harlow/grpc-google-cloud-trace/intercept"
func main() {
// add tracing option to dial
conn, err := grpc.Dial(
address,
intercept.EnableGRPCTracingDialOption,
)
if err != nil {
log.Fatalf("did not connect: %v", err)
}
defer conn.Close()
// ...
}
Use the intercept.EnableGRPCTracingServerOption
function to parse the google cloud context from the request
metadata. The interceptor will set up a new child span of the requesting party.
import "github.com/harlow/grpc-google-cloud-trace/intercept"
func main() {
// ...
grpcServer := grpc.NewServer(
intercept.EnableGRPCTracingServerOption(traceClient),
)
pb.RegisterRouteGuideServer(grpcServer, newServer())
grpcServer.Serve(lis)
}
Create new child spans from the request context:
func getNearbyPoints(ctx context.Context, lat, lon float64) []geo.Point {
span := trace.FromContext(ctx).NewChild("getNearbyPoints")
defer span.Finish()
// ...
}
This codebase was heavily inspired by the following issues and repositories: