forked from TrueCloudLab/distribution
107 lines
3.8 KiB
Go
107 lines
3.8 KiB
Go
// 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 (
|
|
"context"
|
|
"strings"
|
|
|
|
"google.golang.org/grpc/codes"
|
|
"google.golang.org/grpc/metadata"
|
|
"google.golang.org/grpc/stats"
|
|
"google.golang.org/grpc/status"
|
|
|
|
"go.opencensus.io/trace"
|
|
"go.opencensus.io/trace/propagation"
|
|
)
|
|
|
|
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()
|
|
}
|
|
}
|