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// Copyright 2017, OpenCensus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ocgrpc
import (
"strings"
"google.golang.org/grpc/codes"
"go.opencensus.io/trace"
"go.opencensus.io/trace/propagation"
"golang.org/x/net/context"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/stats"
"google.golang.org/grpc/status"
)
const traceContextKey = "grpc-trace-bin"
// TagRPC creates a new trace span for the client side of the RPC.
//
// It returns ctx with the new trace span added and a serialization of the
// SpanContext added to the outgoing gRPC metadata.
func (c *ClientHandler) traceTagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
name := strings.TrimPrefix(rti.FullMethodName, "/")
name = strings.Replace(name, "/", ".", -1)
ctx, span := trace.StartSpan(ctx, name,
trace.WithSampler(c.StartOptions.Sampler),
trace.WithSpanKind(trace.SpanKindClient)) // span is ended by traceHandleRPC
traceContextBinary := propagation.Binary(span.SpanContext())
return metadata.AppendToOutgoingContext(ctx, traceContextKey, string(traceContextBinary))
}
// TagRPC creates a new trace span for the server side of the RPC.
//
// It checks the incoming gRPC metadata in ctx for a SpanContext, and if
// it finds one, uses that SpanContext as the parent context of the new span.
//
// It returns ctx, with the new trace span added.
func (s *ServerHandler) traceTagRPC(ctx context.Context, rti *stats.RPCTagInfo) context.Context {
md, _ := metadata.FromIncomingContext(ctx)
name := strings.TrimPrefix(rti.FullMethodName, "/")
name = strings.Replace(name, "/", ".", -1)
traceContext := md[traceContextKey]
var (
parent trace.SpanContext
haveParent bool
)
if len(traceContext) > 0 {
// Metadata with keys ending in -bin are actually binary. They are base64
// encoded before being put on the wire, see:
// https://github.com/grpc/grpc-go/blob/08d6261/Documentation/grpc-metadata.md#storing-binary-data-in-metadata
traceContextBinary := []byte(traceContext[0])
parent, haveParent = propagation.FromBinary(traceContextBinary)
if haveParent && !s.IsPublicEndpoint {
ctx, _ := trace.StartSpanWithRemoteParent(ctx, name, parent,
trace.WithSpanKind(trace.SpanKindServer),
trace.WithSampler(s.StartOptions.Sampler),
)
return ctx
}
}
ctx, span := trace.StartSpan(ctx, name,
trace.WithSpanKind(trace.SpanKindServer),
trace.WithSampler(s.StartOptions.Sampler))
if haveParent {
span.AddLink(trace.Link{TraceID: parent.TraceID, SpanID: parent.SpanID, Type: trace.LinkTypeChild})
}
return ctx
}
func traceHandleRPC(ctx context.Context, rs stats.RPCStats) {
span := trace.FromContext(ctx)
// TODO: compressed and uncompressed sizes are not populated in every message.
switch rs := rs.(type) {
case *stats.Begin:
span.AddAttributes(
trace.BoolAttribute("Client", rs.Client),
trace.BoolAttribute("FailFast", rs.FailFast))
case *stats.InPayload:
span.AddMessageReceiveEvent(0 /* TODO: messageID */, int64(rs.Length), int64(rs.WireLength))
case *stats.OutPayload:
span.AddMessageSendEvent(0, int64(rs.Length), int64(rs.WireLength))
case *stats.End:
if rs.Error != nil {
s, ok := status.FromError(rs.Error)
if ok {
span.SetStatus(trace.Status{Code: int32(s.Code()), Message: s.Message()})
} else {
span.SetStatus(trace.Status{Code: int32(codes.Internal), Message: rs.Error.Error()})
}
}
span.End()
}
}
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