Breaking Change: Remove usage of ocagent package for oc exporter

    The config for OpenCensus exporter removed .

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

exporter/opencensusexporter/README.md

@@ -27,8 +27,6 @@ The following settings can be optionally configured:
   [grpc.WithKeepaliveParams()](https://godoc.org/google.golang.org/grpc#WithKeepaliveParams).
 - `num_workers` (default = 2): number of workers that send the gRPC requests.
   Optional.
-- `reconnection_delay` (default = unset): time period between each reconnection
-  performed by the exporter.
 - `balancer_name`(default = pick_first): Sets the balancer in grpclb_policy to discover the servers.
 See [grpc loadbalancing example](https://github.com/grpc/grpc-go/blob/master/examples/features/load_balancing/README.md).
 

exporter/opencensusexporter/config.go

@@ -15,8 +15,6 @@
 package opencensusexporter
 
 import (
-	"time"
-
 	"go.opentelemetry.io/collector/config/configgrpc"
 	"go.opentelemetry.io/collector/config/configmodels"
 )
@@ -29,7 +27,4 @@ type Config struct {
 
 	// The number of workers that send the gRPC requests.
 	NumWorkers int `mapstructure:"num_workers"`
-
-	// The time period between each reconnection performed by the exporter.
-	ReconnectionDelay time.Duration `mapstructure:"reconnection_delay,omitempty"`
 }

exporter/opencensusexporter/config_test.go

@@ -71,7 +71,6 @@ func TestLoadConfig(t *testing.T) {
 				WriteBufferSize: 512 * 1024,
 				BalancerName:    "round_robin",
 			},
-			NumWorkers:        123,
-			ReconnectionDelay: 15,
+			NumWorkers: 123,
 		})
 }

exporter/opencensusexporter/factory.go

@@ -15,13 +15,9 @@
 package opencensusexporter
 
 import (
-	"fmt"
+	"context"
 
-	"contrib.go.opencensus.io/exporter/ocagent"
 	"go.uber.org/zap"
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/keepalive"
 
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/config/configgrpc"
@@ -54,82 +50,18 @@ func (f *Factory) CreateDefaultConfig() configmodels.Exporter {
 			// We almost read 0 bytes, so no need to tune ReadBufferSize.
 			WriteBufferSize: 512 * 1024,
 		},
+		NumWorkers: 2,
 	}
 }
 
 // CreateTraceExporter creates a trace exporter based on this config.
-func (f *Factory) CreateTraceExporter(logger *zap.Logger, config configmodels.Exporter) (component.TraceExporterOld, error) {
-	ocac := config.(*Config)
-	opts, err := f.OCAgentOptions(logger, ocac)
-	if err != nil {
-		return nil, err
-	}
-	return NewTraceExporter(logger, config, opts...)
-}
-
-// OCAgentOptions takes the oc exporter Config and generates ocagent Options
-func (f *Factory) OCAgentOptions(logger *zap.Logger, ocac *Config) ([]ocagent.ExporterOption, error) {
-	if ocac.Endpoint == "" {
-		return nil, &ocExporterError{
-			code: errEndpointRequired,
-			msg:  "OpenCensus exporter config requires an Endpoint",
-		}
-	}
-	// TODO(ccaraman): Clean up this usage of gRPC settings apart of PR to address issue #933.
-	opts := []ocagent.ExporterOption{ocagent.WithAddress(ocac.Endpoint)}
-	if ocac.Compression != "" {
-		if compressionKey := configgrpc.GetGRPCCompressionKey(ocac.Compression); compressionKey != configgrpc.CompressionUnsupported {
-			opts = append(opts, ocagent.UseCompressor(compressionKey))
-		} else {
-			return nil, &ocExporterError{
-				code: errUnsupportedCompressionType,
-				msg:  fmt.Sprintf("OpenCensus exporter unsupported compression type %q", ocac.Compression),
-			}
-		}
-	}
-	switch {
-	case ocac.TLSSetting.CAFile != "":
-		creds, err := credentials.NewClientTLSFromFile(ocac.TLSSetting.CAFile, "")
-		if err != nil {
-			return nil, &ocExporterError{
-				code: errUnableToGetTLSCreds,
-				msg:  fmt.Sprintf("OpenCensus exporter unable to read TLS credentials from pem file %q: %v", ocac.TLSSetting.CAFile, err),
-			}
-		}
-		opts = append(opts, ocagent.WithTLSCredentials(creds))
-	case !ocac.TLSSetting.Insecure:
-		tlsConf, err := ocac.TLSSetting.LoadTLSConfig()
-		if err != nil {
-			return nil, fmt.Errorf("OpenCensus exporter failed to load TLS config: %w", err)
-		}
-		creds := credentials.NewTLS(tlsConf)
-		opts = append(opts, ocagent.WithTLSCredentials(creds))
-	default:
-		opts = append(opts, ocagent.WithInsecure())
-	}
-
-	if len(ocac.Headers) > 0 {
-		opts = append(opts, ocagent.WithHeaders(ocac.Headers))
-	}
-	if ocac.ReconnectionDelay > 0 {
-		opts = append(opts, ocagent.WithReconnectionPeriod(ocac.ReconnectionDelay))
-	}
-	if ocac.Keepalive != nil {
-		opts = append(opts, ocagent.WithGRPCDialOption(grpc.WithKeepaliveParams(keepalive.ClientParameters{
-			Time:                ocac.Keepalive.Time,
-			Timeout:             ocac.Keepalive.Timeout,
-			PermitWithoutStream: ocac.Keepalive.PermitWithoutStream,
-		})))
-	}
-	return opts, nil
+func (f *Factory) CreateTraceExporter(_ *zap.Logger, config configmodels.Exporter) (component.TraceExporterOld, error) {
+	oCfg := config.(*Config)
+	return newTraceExporter(context.Background(), oCfg)
 }
 
 // CreateMetricsExporter creates a metrics exporter based on this config.
-func (f *Factory) CreateMetricsExporter(logger *zap.Logger, config configmodels.Exporter) (component.MetricsExporterOld, error) {
+func (f *Factory) CreateMetricsExporter(_ *zap.Logger, config configmodels.Exporter) (component.MetricsExporterOld, error) {
 	oCfg := config.(*Config)
-	opts, err := f.OCAgentOptions(logger, oCfg)
-	if err != nil {
-		return nil, err
-	}
-	return NewMetricsExporter(logger, config, opts...)
+	return newMetricsExporter(context.Background(), oCfg)
 }

exporter/opencensusexporter/factory_test.go

@@ -23,6 +23,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap"
 
+	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/component/componenttest"
 	"go.opentelemetry.io/collector/config/configcheck"
 	"go.opentelemetry.io/collector/config/configgrpc"
@@ -80,27 +81,33 @@ func TestCreateTraceExporter(t *testing.T) {
 				GRPCClientSettings: configgrpc.GRPCClientSettings{
 					Endpoint: "",
 				},
+				NumWorkers: 3,
 			},
 			mustFail: true,
 		},
 		{
-			name: "UseSecure",
+			name: "ZeroNumWorkers",
 			config: Config{
 				GRPCClientSettings: configgrpc.GRPCClientSettings{
 					Endpoint: rcvCfg.NetAddr.Endpoint,
 					TLSSetting: configtls.TLSClientSetting{
 						Insecure: false,
 					},
 				},
+				NumWorkers: 0,
 			},
+			mustFail: true,
 		},
 		{
-			name: "ReconnectionDelay",
+			name: "UseSecure",
 			config: Config{
 				GRPCClientSettings: configgrpc.GRPCClientSettings{
 					Endpoint: rcvCfg.NetAddr.Endpoint,
+					TLSSetting: configtls.TLSClientSetting{
+						Insecure: false,
+					},
 				},
-				ReconnectionDelay: 5 * time.Second,
+				NumWorkers: 3,
 			},
 		},
 		{
@@ -114,6 +121,7 @@ func TestCreateTraceExporter(t *testing.T) {
 						PermitWithoutStream: true,
 					},
 				},
+				NumWorkers: 3,
 			},
 		},
 		{
@@ -123,6 +131,7 @@ func TestCreateTraceExporter(t *testing.T) {
 					Endpoint:    rcvCfg.NetAddr.Endpoint,
 					Compression: configgrpc.CompressionGzip,
 				},
+				NumWorkers: 3,
 			},
 		},
 		{
@@ -135,14 +144,6 @@ func TestCreateTraceExporter(t *testing.T) {
 						"hdr2": "val2",
 					},
 				},
-			},
-		},
-		{
-			name: "NumConsumers",
-			config: Config{
-				GRPCClientSettings: configgrpc.GRPCClientSettings{
-					Endpoint: rcvCfg.NetAddr.Endpoint,
-				},
 				NumWorkers: 3,
 			},
 		},
@@ -153,6 +154,7 @@ func TestCreateTraceExporter(t *testing.T) {
 					Endpoint:    rcvCfg.NetAddr.Endpoint,
 					Compression: "unknown compression",
 				},
+				NumWorkers: 3,
 			},
 			mustFail: true,
 		},
@@ -167,6 +169,7 @@ func TestCreateTraceExporter(t *testing.T) {
 						},
 					},
 				},
+				NumWorkers: 3,
 			},
 		},
 		{
@@ -180,6 +183,7 @@ func TestCreateTraceExporter(t *testing.T) {
 						},
 					},
 				},
+				NumWorkers: 3,
 			},
 			mustFail: true,
 		},
@@ -188,21 +192,22 @@ func TestCreateTraceExporter(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			factory := &Factory{}
-			consumer, err := factory.CreateTraceExporter(zap.NewNop(), &tt.config)
-
-			if tt.mustFail {
-				assert.NotNil(t, err)
-			} else {
-				assert.NoError(t, err)
-				assert.NotNil(t, consumer)
 
-				err = consumer.Shutdown(context.Background())
-				if err != nil {
-					// Since the endpoint of opencensus exporter doesn't actually exist,
-					// exporter may already stop because it cannot connect.
-					assert.Equal(t, err.Error(), "rpc error: code = Canceled desc = grpc: the client connection is closing")
-				}
-			}
+			tReceiver, tErr := factory.CreateTraceExporter(zap.NewNop(), &tt.config)
+			checkErrorsAndShutdown(t, tReceiver, tErr, tt.mustFail)
+			mReceiver, mErr := factory.CreateMetricsExporter(zap.NewNop(), &tt.config)
+			checkErrorsAndShutdown(t, mReceiver, mErr, tt.mustFail)
 		})
 	}
 }
+
+func checkErrorsAndShutdown(t *testing.T, receiver component.Receiver, err error, mustFail bool) {
+	if mustFail {
+		assert.NotNil(t, err)
+	} else {
+		assert.NoError(t, err)
+		assert.NotNil(t, receiver)
+
+		require.NoError(t, receiver.Shutdown(context.Background()))
+	}
+}