Update go dependencies

2018-12-05 13:27:09 -03:00 · 2018-12-05 13:27:09 -03:00 · f4a4daed84
commit f4a4daed84
parent 432f534383
1299 changed files with 71186 additions and 91183 deletions
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/.travis.yml
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/.travis.yml
@ -0,0 +1,17 @@
+language: go
+
+go:
+  - 1.10.x
+
+go_import_path: contrib.go.opencensus.io/exporter/ocagent
+
+before_script:
+  - GO_FILES=$(find . -iname '*.go' | grep -v /vendor/)  # All the .go files, excluding vendor/ if any
+  - PKGS=$(go list ./... | grep -v /vendor/)             # All the import paths, excluding vendor/ if any
+
+script:
+  - go build ./...                    # Ensure dependency updates don't break build
+  - if [ -n "$(gofmt -s -l $GO_FILES)" ]; then echo "gofmt the following files:"; gofmt -s -l $GO_FILES; exit 1; fi
+  - go vet ./...
+  - go test -v -race $PKGS            # Run all the tests with the race detector enabled
+  - 'if [[ $TRAVIS_GO_VERSION = 1.8* ]]; then ! golint ./... | grep -vE "(_mock|_string|\.pb)\.go:"; fi'
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/CONTRIBUTING.md
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/CONTRIBUTING.md
@ -0,0 +1,24 @@
+# How to contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution,
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult [GitHub Help] for more
+information on using pull requests.
+
+[GitHub Help]: https://help.github.com/articles/about-pull-requests/
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/LICENSE
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/LICENSE
@ -0,0 +1,201 @@
+                                 Apache License
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+                        http://www.apache.org/licenses/
+
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+
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--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/README.md
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/README.md
@ -0,0 +1,61 @@
+# OpenCensus Agent Go Exporter
+
+[![Build Status][travis-image]][travis-url] [![GoDoc][godoc-image]][godoc-url]
+
+
+This repository contains the Go implementation of the OpenCensus Agent (OC-Agent) Exporter.
+OC-Agent is a deamon process running in a VM that can retrieve spans/stats/metrics from
+OpenCensus Library, export them to other backends and possibly push configurations back to
+Library. See more details on [OC-Agent Readme][OCAgentReadme].
+
+Note: This is an experimental repository and is likely to get backwards-incompatible changes.
+Ultimately we may want to move the OC-Agent Go Exporter to [OpenCensus Go core library][OpenCensusGo].
+
+## Installation
+
+```bash
+$ go get -u contrib.go.opencensus.io/exporter/ocagent/v1
+```
+
+## Usage
+
+```go
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"contrib.go.opencensus.io/exporter/ocagent/v1"
+	"go.opencensus.io/trace"
+)
+
+func Example() {
+	exp, err := ocagent.NewExporter(ocagent.WithInsecure(), ocagent.WithServiceName("your-service-name"))
+	if err != nil {
+		log.Fatalf("Failed to create the agent exporter: %v", err)
+	}
+	defer exp.Stop()
+
+	// Now register it as a trace exporter.
+	trace.RegisterExporter(exp)
+
+	// Then use the OpenCensus tracing library, like we normally would.
+	ctx, span := trace.StartSpan(context.Background(), "AgentExporter-Example")
+	defer span.End()
+
+	for i := 0; i < 10; i++ {
+		_, iSpan := trace.StartSpan(ctx, fmt.Sprintf("Sample-%d", i))
+		<-time.After(6 * time.Millisecond)
+		iSpan.End()
+	}
+}
+```
+
+[OCAgentReadme]: https://github.com/census-instrumentation/opencensus-proto/tree/master/opencensus/proto/agent#opencensus-agent-proto
+[OpenCensusGo]: https://github.com/census-instrumentation/opencensus-go
+[godoc-image]: https://godoc.org/contrib.go.opencensus.io/exporter/ocagent?status.svg
+[godoc-url]: https://godoc.org/contrib.go.opencensus.io/exporter/ocagent
+[travis-image]: https://travis-ci.org/census-ecosystem/opencensus-go-exporter-ocagent.svg?branch=master
+[travis-url]: https://travis-ci.org/census-ecosystem/opencensus-go-exporter-ocagent
+
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/common.go
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/common.go
@ -0,0 +1,38 @@
+// Copyright 2018, 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 ocagent
+
+import (
+	"math/rand"
+	"time"
+)
+
+var randSrc = rand.New(rand.NewSource(time.Now().UnixNano()))
+
+// retries function fn upto n times, if fn returns an error lest it returns nil early.
+// It applies exponential backoff in units of (1<<n) + jitter microsends.
+func nTriesWithExponentialBackoff(nTries int64, timeBaseUnit time.Duration, fn func() error) (err error) {
+	for i := int64(0); i < nTries; i++ {
+		err = fn()
+		if err == nil {
+			return nil
+		}
+		// Backoff for a time period with a pseudo-random jitter
+		jitter := time.Duration(randSrc.Float64()*100) * time.Microsecond
+		ts := jitter + ((1 << uint64(i)) * timeBaseUnit)
+		<-time.After(ts)
+	}
+	return err
+}
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/go.mod
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/go.mod
@ -0,0 +1,9 @@
+module contrib.go.opencensus.io/exporter/ocagent
+
+require (
+	github.com/census-instrumentation/opencensus-proto v0.0.2-0.20180913191712-f303ae3f8d6a
+	github.com/golang/protobuf v1.2.0
+	go.opencensus.io v0.17.0
+	google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf
+	google.golang.org/grpc v1.15.0
+)
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/go.sum
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/go.sum
@ -0,0 +1,44 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/census-instrumentation/opencensus-proto v0.0.1 h1:4v5I+ax5jCmwTYVaWQacX8ZSxvUZemBX4UwBGSkDeoA=
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+github.com/census-instrumentation/opencensus-proto v0.0.2-0.20180913191712-f303ae3f8d6a/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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+go.opencensus.io v0.17.0 h1:2Cu88MYg+1LU+WVD+NWwYhyP0kKgRlN9QjWGaX0jKTE=
+go.opencensus.io v0.17.0/go.mod h1:mp1VrMQxhlqqDpKvH4UcQUa4YwlzNmymAjPrDdfxNpI=
+golang.org/x/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
+golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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+google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
+google.golang.org/grpc v1.15.0 h1:Az/KuahOM4NAidTEuJCv/RonAA7rYsTPkqXVjr+8OOw=
+google.golang.org/grpc v1.15.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/nodeinfo.go
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/nodeinfo.go
@ -0,0 +1,41 @@
+// Copyright 2018, 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 ocagent
+
+import (
+	"os"
+
+	commonpb "github.com/census-instrumentation/opencensus-proto/gen-go/agent/common/v1"
+	"go.opencensus.io"
+)
+
+func createNodeInfo(nodeName string) *commonpb.Node {
+	return &commonpb.Node{
+		Identifier: &commonpb.ProcessIdentifier{
+			HostName:       os.Getenv("HOSTNAME"),
+			Pid:            uint32(os.Getpid()),
+			StartTimestamp: timeToTimestamp(startTime),
+		},
+		LibraryInfo: &commonpb.LibraryInfo{
+			Language:           commonpb.LibraryInfo_GO_LANG,
+			ExporterVersion:    Version,
+			CoreLibraryVersion: opencensus.Version(),
+		},
+		ServiceInfo: &commonpb.ServiceInfo{
+			Name: nodeName,
+		},
+		Attributes: make(map[string]string),
+	}
+}
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/ocagent.go
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/ocagent.go
@ -0,0 +1,299 @@
+// Copyright 2018, 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 ocagent
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"google.golang.org/api/support/bundler"
+	"google.golang.org/grpc"
+
+	"go.opencensus.io/trace"
+
+	agentcommonpb "github.com/census-instrumentation/opencensus-proto/gen-go/agent/common/v1"
+	agenttracepb "github.com/census-instrumentation/opencensus-proto/gen-go/agent/trace/v1"
+	tracepb "github.com/census-instrumentation/opencensus-proto/gen-go/trace/v1"
+)
+
+var startupMu sync.Mutex
+var startTime time.Time
+
+func init() {
+	startupMu.Lock()
+	startTime = time.Now()
+	startupMu.Unlock()
+}
+
+var _ trace.Exporter = (*Exporter)(nil)
+
+type Exporter struct {
+	// mu protects the non-atomic and non-channel variables
+	mu              sync.RWMutex
+	started         bool
+	stopped         bool
+	agentPort       uint16
+	agentAddress    string
+	serviceName     string
+	canDialInsecure bool
+	traceSvcClient  agenttracepb.TraceServiceClient
+	traceExporter   agenttracepb.TraceService_ExportClient
+	nodeInfo        *agentcommonpb.Node
+	grpcClientConn  *grpc.ClientConn
+
+	traceBundler *bundler.Bundler
+}
+
+func NewExporter(opts ...ExporterOption) (*Exporter, error) {
+	exp, err := NewUnstartedExporter(opts...)
+	if err != nil {
+		return nil, err
+	}
+	if err := exp.Start(); err != nil {
+		return nil, err
+	}
+	return exp, nil
+}
+
+const spanDataBufferSize = 300
+
+func NewUnstartedExporter(opts ...ExporterOption) (*Exporter, error) {
+	e := new(Exporter)
+	for _, opt := range opts {
+		opt.withExporter(e)
+	}
+	if e.agentPort <= 0 {
+		e.agentPort = DefaultAgentPort
+	}
+	traceBundler := bundler.NewBundler((*trace.SpanData)(nil), func(bundle interface{}) {
+		e.uploadTraces(bundle.([]*trace.SpanData))
+	})
+	traceBundler.DelayThreshold = 2 * time.Second
+	traceBundler.BundleCountThreshold = spanDataBufferSize
+	e.traceBundler = traceBundler
+	e.nodeInfo = createNodeInfo(e.serviceName)
+	return e, nil
+}
+
+const (
+	maxInitialConfigRetries = 10
+	maxInitialTracesRetries = 10
+)
+
+// Start dials to the agent, establishing a connection to it. It also
+// initiates the Config and Trace services by sending over the initial
+// messages that consist of the node identifier. Start performs a best case
+// attempt to try to send the initial messages, by applying exponential
+// backoff at most 10 times.
+func (ae *Exporter) Start() error {
+	ae.mu.Lock()
+	defer ae.mu.Unlock()
+
+	err := ae.doStartLocked()
+	if err == nil {
+		ae.started = true
+		return nil
+	}
+
+	// Otherwise we have an error and should clean up to avoid leaking resources.
+	ae.started = false
+	if ae.grpcClientConn != nil {
+		ae.grpcClientConn.Close()
+	}
+
+	return err
+}
+
+func (ae *Exporter) prepareAgentAddress() string {
+	if ae.agentAddress != "" {
+		return ae.agentAddress
+	}
+	port := DefaultAgentPort
+	if ae.agentPort > 0 {
+		port = ae.agentPort
+	}
+	return fmt.Sprintf("%s:%d", DefaultAgentHost, port)
+}
+
+func (ae *Exporter) doStartLocked() error {
+	if ae.started {
+		return nil
+	}
+
+	// Now start it
+	cc, err := ae.dialToAgent()
+	if err != nil {
+		return err
+	}
+	ae.grpcClientConn = cc
+
+	// Initiate the trace service by sending over node identifier info.
+	traceSvcClient := agenttracepb.NewTraceServiceClient(cc)
+	traceExporter, err := traceSvcClient.Export(context.Background())
+	if err != nil {
+		return fmt.Errorf("Exporter.Start:: TraceServiceClient: %v", err)
+	}
+
+	firstTraceMessage := &agenttracepb.ExportTraceServiceRequest{Node: ae.nodeInfo}
+	err = nTriesWithExponentialBackoff(maxInitialTracesRetries, 200*time.Microsecond, func() error {
+		return traceExporter.Send(firstTraceMessage)
+	})
+	if err != nil {
+		return fmt.Errorf("Exporter.Start:: Failed to initiate the Config service: %v", err)
+	}
+	ae.traceExporter = traceExporter
+
+	// Initiate the config service by sending over node identifier info.
+	configStream, err := traceSvcClient.Config(context.Background())
+	if err != nil {
+		return fmt.Errorf("Exporter.Start:: ConfigStream: %v", err)
+	}
+	firstCfgMessage := &agenttracepb.CurrentLibraryConfig{Node: ae.nodeInfo}
+	err = nTriesWithExponentialBackoff(maxInitialConfigRetries, 200*time.Microsecond, func() error {
+		return configStream.Send(firstCfgMessage)
+	})
+	if err != nil {
+		return fmt.Errorf("Exporter.Start:: Failed to initiate the Config service: %v", err)
+	}
+
+	// In the background, handle trace configurations that are beamed down
+	// by the agent, but also reply to it with the applied configuration.
+	go ae.handleConfigStreaming(configStream)
+
+	return nil
+}
+
+// dialToAgent performs a best case attempt to dial to the agent.
+// It retries failed dials with:
+//  * gRPC dialTimeout of 1s
+//  * exponential backoff, 5 times with a period of 50ms
+// hence in the worst case of (no agent actually available), it
+// will take at least:
+//      (5 * 1s) + ((1<<5)-1) * 0.01 s = 5s + 1.55s = 6.55s
+func (ae *Exporter) dialToAgent() (*grpc.ClientConn, error) {
+	addr := ae.prepareAgentAddress()
+	dialOpts := []grpc.DialOption{grpc.WithBlock()}
+	if ae.canDialInsecure {
+		dialOpts = append(dialOpts, grpc.WithInsecure())
+	}
+
+	var cc *grpc.ClientConn
+	dialOpts = append(dialOpts, grpc.WithTimeout(1*time.Second))
+	dialBackoffWaitPeriod := 50 * time.Millisecond
+	err := nTriesWithExponentialBackoff(5, dialBackoffWaitPeriod, func() error {
+		var err error
+		cc, err = grpc.Dial(addr, dialOpts...)
+		return err
+	})
+	return cc, err
+}
+
+func (ae *Exporter) handleConfigStreaming(configStream agenttracepb.TraceService_ConfigClient) error {
+	for {
+		recv, err := configStream.Recv()
+		if err != nil {
+			// TODO: Check if this is a transient error or exponential backoff-able.
+			return err
+		}
+		cfg := recv.Config
+		if cfg == nil {
+			continue
+		}
+
+		// Otherwise now apply the trace configuration sent down from the agent
+		if psamp := cfg.GetProbabilitySampler(); psamp != nil {
+			trace.ApplyConfig(trace.Config{DefaultSampler: trace.ProbabilitySampler(psamp.SamplingProbability)})
+		} else if csamp := cfg.GetConstantSampler(); csamp != nil {
+			alwaysSample := csamp.Decision == true
+			if alwaysSample {
+				trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
+			} else {
+				trace.ApplyConfig(trace.Config{DefaultSampler: trace.NeverSample()})
+			}
+		} else { // TODO: Add the rate limiting sampler here
+		}
+
+		// Then finally send back to upstream the newly applied configuration
+		err = configStream.Send(&agenttracepb.CurrentLibraryConfig{Config: &tracepb.TraceConfig{Sampler: cfg.Sampler}})
+		if err != nil {
+			return err
+		}
+	}
+}
+
+var (
+	errNotStarted = errors.New("not started")
+)
+
+// Stop shuts down all the connections and resources
+// related to the exporter.
+func (ae *Exporter) Stop() error {
+	ae.mu.Lock()
+	defer ae.mu.Unlock()
+
+	if !ae.started {
+		return errNotStarted
+	}
+	if ae.stopped {
+		// TODO: tell the user that we've already stopped, so perhaps a sentinel error?
+		return nil
+	}
+
+	ae.Flush()
+
+	// Now close the underlying gRPC connection.
+	var err error
+	if ae.grpcClientConn != nil {
+		err = ae.grpcClientConn.Close()
+	}
+
+	// At this point we can change the state variables: started and stopped
+	ae.started = false
+	ae.stopped = true
+
+	return err
+}
+
+func (ae *Exporter) ExportSpan(sd *trace.SpanData) {
+	if sd == nil {
+		return
+	}
+	_ = ae.traceBundler.Add(sd, -1)
+}
+
+func (ae *Exporter) uploadTraces(sdl []*trace.SpanData) {
+	if len(sdl) == 0 {
+		return
+	}
+	protoSpans := make([]*tracepb.Span, 0, len(sdl))
+	for _, sd := range sdl {
+		if sd != nil {
+			protoSpans = append(protoSpans, ocSpanToProtoSpan(sd))
+		}
+	}
+
+	if len(protoSpans) > 0 {
+		_ = ae.traceExporter.Send(&agenttracepb.ExportTraceServiceRequest{
+			Spans: protoSpans,
+		})
+	}
+}
+
+func (ae *Exporter) Flush() {
+	ae.traceBundler.Flush()
+}
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/options.go
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/options.go
@ -0,0 +1,80 @@
+// Copyright 2018, 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 ocagent
+
+const (
+	DefaultAgentPort uint16 = 55678
+	DefaultAgentHost string = "localhost"
+)
+
+type ExporterOption interface {
+	withExporter(e *Exporter)
+}
+
+type portSetter uint16
+
+func (ps portSetter) withExporter(e *Exporter) {
+	e.agentPort = uint16(ps)
+}
+
+var _ ExporterOption = (*portSetter)(nil)
+
+type insecureGrpcConnection int
+
+var _ ExporterOption = (*insecureGrpcConnection)(nil)
+
+func (igc *insecureGrpcConnection) withExporter(e *Exporter) {
+	e.canDialInsecure = true
+}
+
+// WithInsecure disables client transport security for the exporter's gRPC connection
+// just like grpc.WithInsecure() https://godoc.org/google.golang.org/grpc#WithInsecure
+// does. Note, by default, client security is required unless WithInsecure is used.
+func WithInsecure() ExporterOption { return new(insecureGrpcConnection) }
+
+// WithPort allows one to override the port that the exporter will
+// connect to the agent on, instead of using DefaultAgentPort.
+func WithPort(port uint16) ExporterOption {
+	return portSetter(port)
+}
+
+type addressSetter string
+
+func (as addressSetter) withExporter(e *Exporter) {
+	e.agentAddress = string(as)
+}
+
+var _ ExporterOption = (*addressSetter)(nil)
+
+// WithAddress allows one to set the address that the exporter will
+// connect to the agent on. If unset, it will instead try to use
+// connect to DefaultAgentHost:DefaultAgentPort
+func WithAddress(addr string) ExporterOption {
+	return addressSetter(addr)
+}
+
+type serviceNameSetter string
+
+func (sns serviceNameSetter) withExporter(e *Exporter) {
+	e.serviceName = string(sns)
+}
+
+var _ ExporterOption = (*serviceNameSetter)(nil)
+
+// WithServiceName allows one to set/override the service name
+// that the exporter will report to the agent.
+func WithServiceName(serviceName string) ExporterOption {
+	return serviceNameSetter(serviceName)
+}
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/transform_spans.go
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/transform_spans.go
@ -0,0 +1,162 @@
+// Copyright 2018, 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 ocagent
+
+import (
+	"time"
+
+	"go.opencensus.io/trace"
+	"go.opencensus.io/trace/tracestate"
+
+	tracepb "github.com/census-instrumentation/opencensus-proto/gen-go/trace/v1"
+	"github.com/golang/protobuf/ptypes/timestamp"
+)
+
+func ocSpanToProtoSpan(sd *trace.SpanData) *tracepb.Span {
+	if sd == nil {
+		return nil
+	}
+	var namePtr *tracepb.TruncatableString
+	if sd.Name != "" {
+		namePtr = &tracepb.TruncatableString{Value: sd.Name}
+	}
+	return &tracepb.Span{
+		TraceId:      sd.TraceID[:],
+		SpanId:       sd.SpanID[:],
+		ParentSpanId: sd.ParentSpanID[:],
+		Status:       ocStatusToProtoStatus(sd.Status),
+		StartTime:    timeToTimestamp(sd.StartTime),
+		EndTime:      timeToTimestamp(sd.EndTime),
+		Links:        ocLinksToProtoLinks(sd.Links),
+		Kind:         ocSpanKindToProtoSpanKind(sd.SpanKind),
+		Name:         namePtr,
+		Attributes:   ocAttributesToProtoAttributes(sd.Attributes),
+		Tracestate:   ocTracestateToProtoTracestate(sd.Tracestate),
+	}
+}
+
+var blankStatus trace.Status
+
+func ocStatusToProtoStatus(status trace.Status) *tracepb.Status {
+	if status == blankStatus {
+		return nil
+	}
+	return &tracepb.Status{
+		Code:    status.Code,
+		Message: status.Message,
+	}
+}
+
+func ocLinksToProtoLinks(links []trace.Link) *tracepb.Span_Links {
+	if len(links) == 0 {
+		return nil
+	}
+
+	sl := make([]*tracepb.Span_Link, 0, len(links))
+	for _, ocLink := range links {
+		// This redefinition is necessary to prevent ocLink.*ID[:] copies
+		// being reused -- in short we need a new ocLink per iteration.
+		ocLink := ocLink
+
+		sl = append(sl, &tracepb.Span_Link{
+			TraceId: ocLink.TraceID[:],
+			SpanId:  ocLink.SpanID[:],
+			Type:    ocLinkTypeToProtoLinkType(ocLink.Type),
+		})
+	}
+
+	return &tracepb.Span_Links{
+		Link: sl,
+	}
+}
+
+func ocLinkTypeToProtoLinkType(oct trace.LinkType) tracepb.Span_Link_Type {
+	switch oct {
+	case trace.LinkTypeChild:
+		return tracepb.Span_Link_CHILD_LINKED_SPAN
+	case trace.LinkTypeParent:
+		return tracepb.Span_Link_PARENT_LINKED_SPAN
+	default:
+		return tracepb.Span_Link_TYPE_UNSPECIFIED
+	}
+}
+
+func ocAttributesToProtoAttributes(attrs map[string]interface{}) *tracepb.Span_Attributes {
+	if len(attrs) == 0 {
+		return nil
+	}
+	outMap := make(map[string]*tracepb.AttributeValue)
+	for k, v := range attrs {
+		switch v := v.(type) {
+		case bool:
+			outMap[k] = &tracepb.AttributeValue{Value: &tracepb.AttributeValue_BoolValue{BoolValue: v}}
+
+		case int:
+			outMap[k] = &tracepb.AttributeValue{Value: &tracepb.AttributeValue_IntValue{IntValue: int64(v)}}
+
+		case int64:
+			outMap[k] = &tracepb.AttributeValue{Value: &tracepb.AttributeValue_IntValue{IntValue: v}}
+
+		case string:
+			outMap[k] = &tracepb.AttributeValue{
+				Value: &tracepb.AttributeValue_StringValue{
+					StringValue: &tracepb.TruncatableString{Value: v},
+				},
+			}
+		}
+	}
+	return &tracepb.Span_Attributes{
+		AttributeMap: outMap,
+	}
+}
+
+func timeToTimestamp(t time.Time) *timestamp.Timestamp {
+	nanoTime := t.UnixNano()
+	return &timestamp.Timestamp{
+		Seconds: nanoTime / 1e9,
+		Nanos:   int32(nanoTime % 1e9),
+	}
+}
+
+func ocSpanKindToProtoSpanKind(kind int) tracepb.Span_SpanKind {
+	switch kind {
+	case trace.SpanKindClient:
+		return tracepb.Span_CLIENT
+	case trace.SpanKindServer:
+		return tracepb.Span_SERVER
+	default:
+		return tracepb.Span_SPAN_KIND_UNSPECIFIED
+	}
+}
+
+func ocTracestateToProtoTracestate(ts *tracestate.Tracestate) *tracepb.Span_Tracestate {
+	if ts == nil {
+		return nil
+	}
+	return &tracepb.Span_Tracestate{
+		Entries: ocTracestateEntriesToProtoTracestateEntries(ts.Entries()),
+	}
+}
+
+func ocTracestateEntriesToProtoTracestateEntries(entries []tracestate.Entry) []*tracepb.Span_Tracestate_Entry {
+	protoEntries := make([]*tracepb.Span_Tracestate_Entry, 0, len(entries))
+	for _, entry := range entries {
+		protoEntries = append(protoEntries, &tracepb.Span_Tracestate_Entry{
+			Key:   entry.Key,
+			Value: entry.Value,
+		})
+	}
+	return protoEntries
+}
--- a/vendor/contrib.go.opencensus.io/exporter/ocagent/version.go
+++ b/vendor/contrib.go.opencensus.io/exporter/ocagent/version.go
@ -0,0 +1,17 @@
+// Copyright 2018, 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 ocagent
+
+const Version = "0.0.1"