[VOL-3196] Enhanced gRPC interfaces to create and propagate Span for log correlation
Change-Id: I48389ca3e8675b64515bfd3088a4de9b688f5cae
diff --git a/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing/server_interceptors.go b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing/server_interceptors.go
new file mode 100644
index 0000000..53764a0
--- /dev/null
+++ b/vendor/github.com/grpc-ecosystem/go-grpc-middleware/tracing/opentracing/server_interceptors.go
@@ -0,0 +1,87 @@
+// Copyright 2017 Michal Witkowski. All Rights Reserved.
+// See LICENSE for licensing terms.
+
+package grpc_opentracing
+
+import (
+ "github.com/grpc-ecosystem/go-grpc-middleware"
+ "github.com/grpc-ecosystem/go-grpc-middleware/tags"
+ "github.com/grpc-ecosystem/go-grpc-middleware/util/metautils"
+ "github.com/opentracing/opentracing-go"
+ "github.com/opentracing/opentracing-go/ext"
+ "github.com/opentracing/opentracing-go/log"
+ "golang.org/x/net/context"
+ "google.golang.org/grpc"
+ "google.golang.org/grpc/grpclog"
+)
+
+var (
+ grpcTag = opentracing.Tag{Key: string(ext.Component), Value: "gRPC"}
+)
+
+// UnaryServerInterceptor returns a new unary server interceptor for OpenTracing.
+func UnaryServerInterceptor(opts ...Option) grpc.UnaryServerInterceptor {
+ o := evaluateOptions(opts)
+ return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) {
+ if o.filterOutFunc != nil && !o.filterOutFunc(ctx, info.FullMethod) {
+ return handler(ctx, req)
+ }
+ newCtx, serverSpan := newServerSpanFromInbound(ctx, o.tracer, info.FullMethod)
+ resp, err := handler(newCtx, req)
+ finishServerSpan(ctx, serverSpan, err)
+ return resp, err
+ }
+}
+
+// StreamServerInterceptor returns a new streaming server interceptor for OpenTracing.
+func StreamServerInterceptor(opts ...Option) grpc.StreamServerInterceptor {
+ o := evaluateOptions(opts)
+ return func(srv interface{}, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
+ if o.filterOutFunc != nil && !o.filterOutFunc(stream.Context(), info.FullMethod) {
+ return handler(srv, stream)
+ }
+ newCtx, serverSpan := newServerSpanFromInbound(stream.Context(), o.tracer, info.FullMethod)
+ wrappedStream := grpc_middleware.WrapServerStream(stream)
+ wrappedStream.WrappedContext = newCtx
+ err := handler(srv, wrappedStream)
+ finishServerSpan(newCtx, serverSpan, err)
+ return err
+ }
+}
+
+func newServerSpanFromInbound(ctx context.Context, tracer opentracing.Tracer, fullMethodName string) (context.Context, opentracing.Span) {
+ md := metautils.ExtractIncoming(ctx)
+ parentSpanContext, err := tracer.Extract(opentracing.HTTPHeaders, metadataTextMap(md))
+ if err != nil && err != opentracing.ErrSpanContextNotFound {
+ grpclog.Printf("grpc_opentracing: failed parsing trace information: %v", err)
+ }
+
+ serverSpan := tracer.StartSpan(
+ fullMethodName,
+ // this is magical, it attaches the new span to the parent parentSpanContext, and creates an unparented one if empty.
+ ext.RPCServerOption(parentSpanContext),
+ grpcTag,
+ )
+
+ injectOpentracingIdsToTags(serverSpan, grpc_ctxtags.Extract(ctx))
+ return opentracing.ContextWithSpan(ctx, serverSpan), serverSpan
+}
+
+func finishServerSpan(ctx context.Context, serverSpan opentracing.Span, err error) {
+ // Log context information
+ tags := grpc_ctxtags.Extract(ctx)
+ for k, v := range tags.Values() {
+ // Don't tag errors, log them instead.
+ if vErr, ok := v.(error); ok {
+ serverSpan.LogKV(k, vErr.Error())
+
+ } else {
+ serverSpan.SetTag(k, v)
+ }
+ }
+ if err != nil {
+ ext.Error.Set(serverSpan, true)
+ serverSpan.LogFields(log.String("event", "error"), log.String("message", err.Error()))
+ }
+ serverSpan.Finish()
+}