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