Cortex Exporter Send Pipeline (#210)

* Add addHeaders for adding headers to a HTTP request and TestAddHeaders

* Add buildMessage for creating a compressed protobuf message and tests

* Add buildRequest for creating the HTTP request and TestBuildRequest

* Add sendRequest, TestSendRequest, and test helper function

* Run make precommit

* Change test helper function name, adjust comments, run make precommit

exporters/metric/cortex/cortex.go

@@ -15,7 +15,14 @@
 package cortex
 
 import (
+	"bytes"
 	"context"
+	"fmt"
+	"net/http"
+
+	"github.com/gogo/protobuf/proto"
+	"github.com/golang/snappy"
+	"github.com/prometheus/prometheus/prompb"
 
 	"go.opentelemetry.io/otel/api/global"
 	apimetric "go.opentelemetry.io/otel/api/metric"
@@ -78,3 +85,75 @@ func InstallNewPipeline(config Config, options ...push.Option) (*push.Controller
 	global.SetMeterProvider(pusher.Provider())
 	return pusher, nil
 }
+
+// addHeaders adds required headers as well as all headers in Header map to a http
+// request.
+func (e *Exporter) addHeaders(req *http.Request) {
+	// Cortex expects Snappy-compressed protobuf messages. These three headers are
+	// hard-coded as they should be on every request.
+	req.Header.Add("X-Prometheus-Remote-Write-Version", "0.1.0")
+	req.Header.Add("Content-Encoding", "snappy")
+	req.Header.Set("Content-Type", "application/x-protobuf")
+
+	// Add all user-supplied headers to the request.
+	for name, field := range e.config.Headers {
+		req.Header.Add(name, field)
+	}
+}
+
+// buildMessage creates a Snappy-compressed protobuf message from a slice of TimeSeries.
+func (e *Exporter) buildMessage(timeseries []*prompb.TimeSeries) ([]byte, error) {
+	// Wrap the TimeSeries as a WriteRequest since Cortex requires it.
+	writeRequest := &prompb.WriteRequest{
+		Timeseries: timeseries,
+	}
+
+	// Convert the struct to a slice of bytes and then compress it.
+	message, err := proto.Marshal(writeRequest)
+	if err != nil {
+		return nil, err
+	}
+	compressed := snappy.Encode(nil, message)
+
+	return compressed, nil
+}
+
+// buildRequest creates an http POST request with a Snappy-compressed protocol buffer
+// message as the body and with all the headers attached.
+func (e *Exporter) buildRequest(message []byte) (*http.Request, error) {
+	req, err := http.NewRequest(
+		http.MethodPost,
+		e.config.Endpoint,
+		bytes.NewBuffer(message),
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	// Add the required headers and the headers from Config.Headers.
+	e.addHeaders(req)
+
+	return req, nil
+}
+
+// sendRequest sends an http request using the Exporter's http Client.
+func (e *Exporter) sendRequest(req *http.Request) error {
+	// Set a client if the user didn't provide one.
+	if e.config.Client == nil {
+		e.config.Client = http.DefaultClient
+		e.config.Client.Timeout = e.config.RemoteTimeout
+	}
+
+	// Attempt to send request.
+	res, err := e.config.Client.Do(req)
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+
+	// The response should have a status code of 200.
+	if res.StatusCode != http.StatusOK {
+		return fmt.Errorf("%v", res.Status)
+	}
+	return nil
+}

exporters/metric/cortex/cortex_test.go

@@ -15,11 +15,19 @@
 package cortex
 
 import (
+	"fmt"
+	"io/ioutil"
 	"net/http"
+	"net/http/httptest"
+	"strconv"
 	"testing"
 	"time"
 
+	"github.com/gogo/protobuf/proto"
+	"github.com/golang/snappy"
 	"github.com/google/go-cmp/cmp"
+	"github.com/prometheus/prometheus/prompb"
+	"github.com/stretchr/testify/require"
 
 	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/sdk/export/metric"
@@ -97,3 +105,171 @@ func TestInstallNewPipeline(t *testing.T) {
 		t.Fatalf("Failed to register push Controller provider globally")
 	}
 }
+
+// TestAddHeaders tests whether the correct headers are correctly added to a http request.
+func TestAddHeaders(t *testing.T) {
+	testConfig := Config{
+		Headers: map[string]string{
+			"TestHeaderOne": "TestFieldTwo",
+			"TestHeaderTwo": "TestFieldTwo",
+		},
+	}
+	exporter := Exporter{testConfig}
+
+	// Create http request to add headers to.
+	req, err := http.NewRequest("POST", "test.com", nil)
+	require.Nil(t, err)
+	exporter.addHeaders(req)
+
+	// Check that all the headers are there.
+	for name, field := range testConfig.Headers {
+		require.Equal(t, req.Header.Get(name), field)
+	}
+	require.Equal(t, req.Header.Get("Content-Encoding"), "snappy")
+	require.Equal(t, req.Header.Get("Content-Type"), "application/x-protobuf")
+	require.Equal(t, req.Header.Get("X-Prometheus-Remote-Write-Version"), "0.1.0")
+}
+
+// TestBuildMessage tests whether BuildMessage successfully returns a Snappy-compressed
+// protobuf message.
+func TestBuildMessage(t *testing.T) {
+	exporter := Exporter{validConfig}
+	timeseries := []*prompb.TimeSeries{}
+
+	// buildMessage returns the error that proto.Marshal() returns. Since the proto
+	// package has its own tests, buildMessage should work as expected as long as there
+	// are no errors.
+	_, err := exporter.buildMessage(timeseries)
+	require.Nil(t, err)
+}
+
+// TestBuildRequest tests whether a http request is a POST request, has the correct body,
+// and has the correct headers.
+func TestBuildRequest(t *testing.T) {
+	// Make fake exporter and message for testing.
+	var testMessage = []byte(`Test Message`)
+	exporter := Exporter{validConfig}
+
+	// Create the http request.
+	req, err := exporter.buildRequest(testMessage)
+	require.Nil(t, err)
+
+	// Verify the http method, url, and body.
+	require.Equal(t, req.Method, http.MethodPost)
+	require.Equal(t, req.URL.String(), validConfig.Endpoint)
+
+	reqMessage, err := ioutil.ReadAll(req.Body)
+	require.Nil(t, err)
+	require.Equal(t, reqMessage, testMessage)
+
+	// Verify headers.
+	for name, field := range exporter.config.Headers {
+		require.Equal(t, req.Header.Get(name), field)
+	}
+	require.Equal(t, req.Header.Get("Content-Encoding"), "snappy")
+	require.Equal(t, req.Header.Get("Content-Type"), "application/x-protobuf")
+	require.Equal(t, req.Header.Get("X-Prometheus-Remote-Write-Version"), "0.1.0")
+}
+
+// verifyExporterRequest checks a HTTP request from the export pipeline. It checks whether
+// the request contains a correctly formatted remote_write body and the required headers.
+func verifyExporterRequest(req *http.Request) error {
+	// Check for required headers.
+	if req.Header.Get("X-Prometheus-Remote-Write-Version") != "0.1.0" ||
+		req.Header.Get("Content-Encoding") != "snappy" ||
+		req.Header.Get("Content-Type") != "application/x-protobuf" {
+		return fmt.Errorf("Request does not contain the three required headers")
+	}
+
+	// Check body format and headers.
+	compressed, err := ioutil.ReadAll(req.Body)
+	if err != nil {
+		return fmt.Errorf("Failed to read request body")
+	}
+	uncompressed, err := snappy.Decode(nil, compressed)
+	if err != nil {
+		return fmt.Errorf("Failed to uncompress request body")
+	}
+	wr := &prompb.WriteRequest{}
+	err = proto.Unmarshal(uncompressed, wr)
+	if err != nil {
+		return fmt.Errorf("Failed to unmarshal message into WriteRequest struct")
+	}
+
+	return nil
+}
+
+// TestSendRequest checks if the Exporter can successfully send a http request with a
+// correctly formatted body and the correct headers. A test server returns different
+// status codes to test if the Exporter responds to a send failure correctly.
+func TestSendRequest(t *testing.T) {
+	tests := []struct {
+		testName         string
+		config           *Config
+		expectedError    error
+		isStatusNotFound bool
+	}{
+		{
+			testName:         "Successful Export",
+			config:           &validConfig,
+			expectedError:    nil,
+			isStatusNotFound: false,
+		},
+		{
+			testName:         "Export Failure",
+			config:           &Config{},
+			expectedError:    fmt.Errorf("%v", "404 Not Found"),
+			isStatusNotFound: true,
+		},
+	}
+
+	// Set up a test server to receive the request. The server responds with a 400 Bad
+	// Request status code if any headers are missing or if the body is not of the correct
+	// format. Additionally, the server can respond with status code 404 Not Found to
+	// simulate send failures.
+	handler := func(rw http.ResponseWriter, req *http.Request) {
+		err := verifyExporterRequest(req)
+		if err != nil {
+			rw.WriteHeader(http.StatusBadRequest)
+			return
+		}
+
+		// Return a status code 400 if header isStatusNotFound is "true", 200 otherwise.
+		if req.Header.Get("isStatusNotFound") == "true" {
+			rw.WriteHeader(http.StatusNotFound)
+		} else {
+			rw.WriteHeader(http.StatusOK)
+		}
+	}
+	server := httptest.NewServer(http.HandlerFunc(handler))
+	defer server.Close()
+
+	for _, test := range tests {
+		t.Run(test.testName, func(t *testing.T) {
+			// Set up an Exporter that uses the test server's endpoint and attaches the
+			// test's isStatusNotFound header.
+			test.config.Endpoint = server.URL
+			test.config.Headers = map[string]string{
+				"isStatusNotFound": strconv.FormatBool(test.isStatusNotFound),
+			}
+			exporter := Exporter{*test.config}
+
+			// Create an empty Snappy-compressed message.
+			msg, err := exporter.buildMessage([]*prompb.TimeSeries{})
+			require.Nil(t, err)
+
+			// Create a http POST request with the compressed message.
+			req, err := exporter.buildRequest(msg)
+			require.Nil(t, err)
+
+			// Send the request to the test server and verify the error.
+			err = exporter.sendRequest(req)
+			if err != nil {
+				errorString := err.Error()
+				require.Equal(t, errorString, test.expectedError.Error())
+			} else {
+				require.Nil(t, test.expectedError)
+			}
+		})
+	}
+}

exporters/metric/cortex/go.mod

@@ -3,7 +3,11 @@ module go.opentelemetry.io/contrib/exporters/metric/cortex
 go 1.14
 
 require (
+	github.com/gogo/protobuf v1.3.1
+	github.com/golang/snappy v0.0.1
 	github.com/google/go-cmp v0.5.1
+	github.com/grpc-ecosystem/grpc-gateway v1.14.6 // indirect
+	github.com/prometheus/prometheus v2.5.0+incompatible
 	github.com/stretchr/testify v1.6.1
 	go.opentelemetry.io/otel v0.10.0
 	go.opentelemetry.io/otel/sdk v0.10.0

exporters/metric/cortex/go.sum

@@ -1,7 +1,9 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/DataDog/sketches-go v0.0.1 h1:RtG+76WKgZuz6FIaGsjoPePmadDBkuD/KC6+ZWu78b8=
 github.com/DataDog/sketches-go v0.0.1/go.mod h1:Q5DbzQ+3AkgGwymQO7aZFNP7ns2lZKGtvRBzRXfdi60=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/benbjohnson/clock v1.0.3 h1:vkLuvpK4fmtSCuo60+yC63p7y0BmQ8gm5ZXGuBCJyXg=
 github.com/benbjohnson/clock v1.0.3/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
@@ -11,8 +13,12 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls=
+github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@@ -25,6 +31,8 @@ github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:W
 github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
 github.com/golang/protobuf v1.4.2 h1:+Z5KGCizgyZCbGh1KZqA0fcLLkwbsjIzS4aV2v7wJX0=
 github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
+github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
+github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
@@ -33,6 +41,10 @@ github.com/google/go-cmp v0.5.1 h1:JFrFEBb2xKufg6XkJsJr+WbKb4FQlURi5RUcBveYu9k=
 github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/gofuzz v1.1.0 h1:Hsa8mG0dQ46ij8Sl2AYJDUv1oA9/d6Vk+3LG99Oe02g=
 github.com/google/gofuzz v1.1.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/grpc-ecosystem/grpc-gateway v1.14.6 h1:8ERzHx8aj1Sc47mu9n/AksaKCSWrMchFtkdrS4BIj5o=
+github.com/grpc-ecosystem/grpc-gateway v1.14.6/go.mod h1:zdiPV4Yse/1gnckTHtghG4GkDEdKCRJduHpTxT3/jcw=
+github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
+github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
@@ -42,6 +54,10 @@ github.com/opentracing/opentracing-go v1.2.0/go.mod h1:GxEUsuufX4nBwe+T+Wl9TAgYr
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
+github.com/prometheus/prometheus v2.5.0+incompatible h1:7QPitgO2kOFG8ecuRn9O/4L9+10He72rVRJvMXrE9Hg=
+github.com/prometheus/prometheus v2.5.0+incompatible/go.mod h1:oAIUtOny2rjMX0OWN5vPR5/q/twIROJvdqnQKDdil/s=
+github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
+github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
@@ -57,17 +73,25 @@ golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvx
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20191002035440-2ec189313ef0 h1:2mqDk8w/o6UmeUCu5Qiq2y7iMf6anbx+YA8d1JFoFrs=
+golang.org/x/net v0.0.0-20191002035440-2ec189313ef0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
+golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1 h1:ogLJMz+qpzav7lGMh10LMvAkM/fAoGlaiiHYiFYdm80=
 golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
@@ -78,11 +102,14 @@ google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9Ywl
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/genproto v0.0.0-20191009194640-548a555dbc03 h1:4HYDjxeNXAOTv3o1N2tjo8UUSlhQgAD52FVkwxnWgM8=
 google.golang.org/genproto v0.0.0-20191009194640-548a555dbc03/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884 h1:fiNLklpBwWK1mth30Hlwk+fcdBmIALlgF5iy77O37Ig=
+google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
 google.golang.org/grpc v1.30.0 h1:M5a8xTlYTxwMn5ZFkwhRabsygDY5G8TYLyQDBxJNAxE=
 google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
@@ -95,6 +122,7 @@ google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=