mirror of https://github.com/pulumi/pulumi.git
95 lines
3.2 KiB
Go
95 lines
3.2 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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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 rpcutil
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import (
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"context"
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"strings"
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"github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc"
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opentracing "github.com/opentracing/opentracing-go"
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"github.com/pulumi/pulumi/sdk/v3/go/common/util/contract"
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"google.golang.org/grpc"
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"google.golang.org/grpc/metadata"
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)
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// metadataReaderWriter satisfies both the opentracing.TextMapReader and
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// opentracing.TextMapWriter interfaces.
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type metadataReaderWriter struct {
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metadata.MD
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}
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func (w metadataReaderWriter) Set(key, val string) {
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// The GRPC HPACK implementation rejects any uppercase keys here.
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//
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// As such, since the HTTP_HEADERS format is case-insensitive anyway, we
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// blindly lowercase the key (which is guaranteed to work in the
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// Inject/Extract sense per the OpenTracing spec).
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key = strings.ToLower(key)
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w.MD[key] = append(w.MD[key], val)
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}
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func (w metadataReaderWriter) ForeachKey(handler func(key, val string) error) error {
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for k, vals := range w.MD {
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for _, v := range vals {
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if err := handler(k, v); err != nil {
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return err
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}
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}
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}
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return nil
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}
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// OpenTracingServerInterceptor provides a default gRPC server interceptor for emitting tracing to the global
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// OpenTracing tracer.
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func OpenTracingServerInterceptor(parentSpan opentracing.Span, options ...otgrpc.Option) grpc.UnaryServerInterceptor {
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// Log full payloads along with trace spans
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options = append(options, otgrpc.LogPayloads())
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tracingInterceptor := otgrpc.OpenTracingServerInterceptor(opentracing.GlobalTracer(), options...)
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if parentSpan == nil {
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return tracingInterceptor
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}
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spanContext := parentSpan.Context()
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return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
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handler grpc.UnaryHandler) (interface{}, error) {
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md, ok := metadata.FromIncomingContext(ctx)
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if !ok {
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md = metadata.New(nil)
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}
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carrier := metadataReaderWriter{md}
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_, err := opentracing.GlobalTracer().Extract(opentracing.HTTPHeaders, carrier)
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if err == opentracing.ErrSpanContextNotFound {
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contract.IgnoreError(opentracing.GlobalTracer().Inject(spanContext, opentracing.HTTPHeaders, carrier))
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}
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return tracingInterceptor(ctx, req, info, handler)
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}
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}
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// OpenTracingClientInterceptor provides a default gRPC client interceptor for emitting tracing to the global
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// OpenTracing tracer.
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func OpenTracingClientInterceptor(options ...otgrpc.Option) grpc.UnaryClientInterceptor {
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options = append(options,
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// Log full payloads along with trace spans
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otgrpc.LogPayloads(),
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// Do not trace calls to the empty method
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otgrpc.IncludingSpans(func(_ opentracing.SpanContext, method string, _, _ interface{}) bool {
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return method != ""
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}))
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return otgrpc.OpenTracingClientInterceptor(opentracing.GlobalTracer(), options...)
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}
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