Update metric SDK to use oterror.Handler

sdk/metric/config.go

@@ -14,16 +14,12 @@
 
 package metric
 
-import "go.opentelemetry.io/otel/sdk/resource"
+import (
+	"go.opentelemetry.io/otel/sdk/resource"
+)
 
 // Config contains configuration for an SDK.
 type Config struct {
-	// ErrorHandler is the function called when the SDK encounters an error.
-	//
-	// This option can be overridden after instantiation of the SDK
-	// with the `SetErrorHandler` method.
-	ErrorHandler ErrorHandler
-
 	// Resource describes all the metric records processed by the
 	// Accumulator.
 	Resource *resource.Resource
@@ -35,17 +31,6 @@ type Option interface {
 	Apply(*Config)
 }
 
-// WithErrorHandler sets the ErrorHandler configuration option of a Config.
-func WithErrorHandler(fn ErrorHandler) Option {
-	return errorHandlerOption(fn)
-}
-
-type errorHandlerOption ErrorHandler
-
-func (o errorHandlerOption) Apply(config *Config) {
-	config.ErrorHandler = ErrorHandler(o)
-}
-
 // WithResource sets the Resource configuration option of a Config.
 func WithResource(res *resource.Resource) Option {
 	return resourceOption{res}

sdk/metric/config_test.go

@@ -1,45 +0,0 @@
-// Copyright The OpenTelemetry 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 metric
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-)
-
-func TestWithErrorHandler(t *testing.T) {
-	errH, reg := func() (ErrorHandler, *error) {
-		e := fmt.Errorf("default invalid")
-		reg := &e
-		return func(err error) {
-			*reg = err
-		}, reg
-	}()
-
-	c := &Config{}
-	WithErrorHandler(errH).Apply(c)
-	err1 := fmt.Errorf("error 1")
-	c.ErrorHandler(err1)
-	assert.EqualError(t, *reg, err1.Error())
-
-	// Ensure overwriting works.
-	c = &Config{ErrorHandler: DefaultErrorHandler}
-	WithErrorHandler(errH).Apply(c)
-	err2 := fmt.Errorf("error 2")
-	c.ErrorHandler(err2)
-	assert.EqualError(t, *reg, err2.Error())
-}

sdk/metric/controller/pull/config.go

@@ -17,17 +17,11 @@ package pull
 import (
 	"time"
 
-	sdk "go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/resource"
 )
 
 // Config contains configuration for a push Controller.
 type Config struct {
-	// ErrorHandler is the function called when the Controller encounters an error.
-	//
-	// This option can be overridden after instantiation of the Controller
-	// with the `SetErrorHandler` method.
-	ErrorHandler sdk.ErrorHandler
 
 	// Resource is the OpenTelemetry resource associated with all Meters
 	// created by the Controller.
@@ -52,17 +46,6 @@ type Option interface {
 	Apply(*Config)
 }
 
-// WithErrorHandler sets the ErrorHandler configuration option of a Config.
-func WithErrorHandler(fn sdk.ErrorHandler) Option {
-	return errorHandlerOption(fn)
-}
-
-type errorHandlerOption sdk.ErrorHandler
-
-func (o errorHandlerOption) Apply(config *Config) {
-	config.ErrorHandler = sdk.ErrorHandler(o)
-}
-
 // WithResource sets the Resource configuration option of a Config.
 func WithResource(r *resource.Resource) Option {
 	return resourceOption{r}

sdk/metric/controller/pull/pull.go

@@ -47,9 +47,8 @@ type Controller struct {
 // New returns a *Controller configured with an aggregation selector and options.
 func New(selector export.AggregationSelector, options ...Option) *Controller {
 	config := &Config{
-		Resource:     resource.Empty(),
-		ErrorHandler: sdk.DefaultErrorHandler,
-		CachePeriod:  DefaultCachePeriod,
+		Resource:    resource.Empty(),
+		CachePeriod: DefaultCachePeriod,
 	}
 	for _, opt := range options {
 		opt.Apply(config)
@@ -58,7 +57,6 @@ func New(selector export.AggregationSelector, options ...Option) *Controller {
 	accum := sdk.NewAccumulator(
 		integrator,
 		sdk.WithResource(config.Resource),
-		sdk.WithErrorHandler(config.ErrorHandler),
 	)
 	return &Controller{
 		accumulator: accum,

sdk/metric/controller/push/config.go

@@ -17,18 +17,11 @@ package push
 import (
 	"time"
 
-	sdk "go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/resource"
 )
 
 // Config contains configuration for a push Controller.
 type Config struct {
-	// ErrorHandler is the function called when the Controller encounters an error.
-	//
-	// This option can be overridden after instantiation of the Controller
-	// with the `SetErrorHandler` method.
-	ErrorHandler sdk.ErrorHandler
-
 	// Resource is the OpenTelemetry resource associated with all Meters
 	// created by the Controller.
 	Resource *resource.Resource
@@ -53,17 +46,6 @@ type Option interface {
 	Apply(*Config)
 }
 
-// WithErrorHandler sets the ErrorHandler configuration option of a Config.
-func WithErrorHandler(fn sdk.ErrorHandler) Option {
-	return errorHandlerOption(fn)
-}
-
-type errorHandlerOption sdk.ErrorHandler
-
-func (o errorHandlerOption) Apply(config *Config) {
-	config.ErrorHandler = sdk.ErrorHandler(o)
-}
-
 // WithResource sets the Resource configuration option of a Config.
 func WithResource(r *resource.Resource) Option {
 	return resourceOption{r}

sdk/metric/controller/push/config_test.go

@@ -15,40 +15,15 @@
 package push
 
 import (
-	"fmt"
 	"testing"
 
 	"go.opentelemetry.io/otel/api/kv"
 
 	"github.com/stretchr/testify/assert"
 
-	sdk "go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/resource"
 )
 
-func TestWithErrorHandler(t *testing.T) {
-	errH, reg := func() (sdk.ErrorHandler, *error) {
-		e := fmt.Errorf("default invalid")
-		reg := &e
-		return func(err error) {
-			*reg = err
-		}, reg
-	}()
-
-	c := &Config{}
-	WithErrorHandler(errH).Apply(c)
-	err1 := fmt.Errorf("error 1")
-	c.ErrorHandler(err1)
-	assert.EqualError(t, *reg, err1.Error())
-
-	// Ensure overwriting works.
-	c = &Config{ErrorHandler: sdk.DefaultErrorHandler}
-	WithErrorHandler(errH).Apply(c)
-	err2 := fmt.Errorf("error 2")
-	c.ErrorHandler(err2)
-	assert.EqualError(t, *reg, err2.Error())
-}
-
 func TestWithResource(t *testing.T) {
 	r := resource.New(kv.String("A", "a"))
 

sdk/metric/controller/push/push.go

@@ -19,6 +19,7 @@ import (
 	"sync"
 	"time"
 
+	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/metric"
 	"go.opentelemetry.io/otel/api/metric/registry"
 	export "go.opentelemetry.io/otel/sdk/export/metric"
@@ -32,18 +33,17 @@ const DefaultPushPeriod = 10 * time.Second
 
 // Controller organizes a periodic push of metric data.
 type Controller struct {
-	lock         sync.Mutex
-	accumulator  *sdk.Accumulator
-	provider     *registry.Provider
-	errorHandler sdk.ErrorHandler
-	integrator   *simple.Integrator
-	exporter     export.Exporter
-	wg           sync.WaitGroup
-	ch           chan struct{}
-	period       time.Duration
-	timeout      time.Duration
-	clock        controllerTime.Clock
-	ticker       controllerTime.Ticker
+	lock        sync.Mutex
+	accumulator *sdk.Accumulator
+	provider    *registry.Provider
+	integrator  *simple.Integrator
+	exporter    export.Exporter
+	wg          sync.WaitGroup
+	ch          chan struct{}
+	period      time.Duration
+	timeout     time.Duration
+	clock       controllerTime.Clock
+	ticker      controllerTime.Ticker
 }
 
 // New constructs a Controller, an implementation of metric.Provider,
@@ -51,8 +51,7 @@ type Controller struct {
 // periodic collection.
 func New(selector export.AggregationSelector, exporter export.Exporter, opts ...Option) *Controller {
 	c := &Config{
-		ErrorHandler: sdk.DefaultErrorHandler,
-		Period:       DefaultPushPeriod,
+		Period: DefaultPushPeriod,
 	}
 	for _, opt := range opts {
 		opt.Apply(c)
@@ -64,19 +63,17 @@ func New(selector export.AggregationSelector, exporter export.Exporter, opts ...
 	integrator := simple.New(selector, c.Stateful)
 	impl := sdk.NewAccumulator(
 		integrator,
-		sdk.WithErrorHandler(c.ErrorHandler),
 		sdk.WithResource(c.Resource),
 	)
 	return &Controller{
-		provider:     registry.NewProvider(impl),
-		accumulator:  impl,
-		integrator:   integrator,
-		exporter:     exporter,
-		errorHandler: c.ErrorHandler,
-		ch:           make(chan struct{}),
-		period:       c.Period,
-		timeout:      c.Timeout,
-		clock:        controllerTime.RealClock{},
+		provider:    registry.NewProvider(impl),
+		accumulator: impl,
+		integrator:  integrator,
+		exporter:    exporter,
+		ch:          make(chan struct{}),
+		period:      c.Period,
+		timeout:     c.Timeout,
+		clock:       controllerTime.RealClock{},
 	}
 }
 
@@ -88,15 +85,6 @@ func (c *Controller) SetClock(clock controllerTime.Clock) {
 	c.clock = clock
 }
 
-// SetErrorHandler sets the handler for errors.  If none has been set, the
-// SDK default error handler is used.
-func (c *Controller) SetErrorHandler(errorHandler sdk.ErrorHandler) {
-	c.lock.Lock()
-	defer c.lock.Unlock()
-	c.errorHandler = errorHandler
-	c.accumulator.SetErrorHandler(errorHandler)
-}
-
 // Provider returns a metric.Provider instance for this controller.
 func (c *Controller) Provider() metric.Provider {
 	return c.provider
@@ -160,6 +148,6 @@ func (c *Controller) tick() {
 	c.integrator.FinishedCollection()
 
 	if err != nil {
-		c.errorHandler(err)
+		global.Handle(err)
 	}
 }

sdk/metric/correct_test.go

@@ -19,12 +19,12 @@ import (
 	"fmt"
 	"math"
 	"strings"
-	"sync"
 	"sync/atomic"
 	"testing"
 
 	"github.com/stretchr/testify/require"
 
+	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/kv"
 	"go.opentelemetry.io/otel/api/label"
 	"go.opentelemetry.io/otel/api/metric"
@@ -40,42 +40,50 @@ import (
 var Must = metric.Must
 var testResource = resource.New(kv.String("R", "V"))
 
+type handler struct{ err error }
+
+func (h *handler) Handle(err error) {
+	h.err = err
+}
+
+func (h *handler) Reset() {
+	h.err = nil
+}
+
+func (h *handler) Flush() error {
+	err := h.err
+	h.Reset()
+	return err
+}
+
+var testHandler *handler
+
+func init() {
+	testHandler = new(handler)
+	global.SetHandler(testHandler)
+}
+
 type correctnessIntegrator struct {
 	newAggCount int64
 
 	t *testing.T
 
 	records []export.Record
-
-	sync.Mutex
-	err error
 }
 
 func newSDK(t *testing.T) (metric.Meter, *metricsdk.Accumulator, *correctnessIntegrator) {
+	testHandler.Reset()
 	integrator := &correctnessIntegrator{
 		t: t,
 	}
 	accum := metricsdk.NewAccumulator(
 		integrator,
 		metricsdk.WithResource(testResource),
-		metricsdk.WithErrorHandler(func(err error) {
-			integrator.Lock()
-			defer integrator.Unlock()
-			integrator.err = err
-		}),
 	)
 	meter := metric.WrapMeterImpl(accum, "test")
 	return meter, accum, integrator
 }
 
-func (ci *correctnessIntegrator) sdkErr() error {
-	ci.Lock()
-	defer ci.Unlock()
-	t := ci.err
-	ci.err = nil
-	return t
-}
-
 func (ci *correctnessIntegrator) AggregatorFor(descriptor *metric.Descriptor) (agg export.Aggregator) {
 	name := descriptor.Name()
 
@@ -110,16 +118,10 @@ func TestInputRangeCounter(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, integrator := newSDK(t)
 
-	var sdkErr error
-	sdk.SetErrorHandler(func(handleErr error) {
-		sdkErr = handleErr
-	})
-
 	counter := Must(meter).NewInt64Counter("name.counter")
 
 	counter.Add(ctx, -1)
-	require.Equal(t, aggregator.ErrNegativeInput, sdkErr)
-	sdkErr = nil
+	require.Equal(t, aggregator.ErrNegativeInput, testHandler.Flush())
 
 	checkpointed := sdk.Collect(ctx)
 	require.Equal(t, 0, checkpointed)
@@ -131,18 +133,13 @@ func TestInputRangeCounter(t *testing.T) {
 	require.Equal(t, int64(1), sum.AsInt64())
 	require.Equal(t, 1, checkpointed)
 	require.Nil(t, err)
-	require.Nil(t, sdkErr)
+	require.Nil(t, testHandler.Flush())
 }
 
 func TestInputRangeUpDownCounter(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, integrator := newSDK(t)
 
-	var sdkErr error
-	sdk.SetErrorHandler(func(handleErr error) {
-		sdkErr = handleErr
-	})
-
 	counter := Must(meter).NewInt64UpDownCounter("name.updowncounter")
 
 	counter.Add(ctx, -1)
@@ -155,23 +152,17 @@ func TestInputRangeUpDownCounter(t *testing.T) {
 	require.Equal(t, int64(1), sum.AsInt64())
 	require.Equal(t, 1, checkpointed)
 	require.Nil(t, err)
-	require.Nil(t, sdkErr)
+	require.Nil(t, testHandler.Flush())
 }
 
 func TestInputRangeValueRecorder(t *testing.T) {
 	ctx := context.Background()
 	meter, sdk, integrator := newSDK(t)
 
-	var sdkErr error
-	sdk.SetErrorHandler(func(handleErr error) {
-		sdkErr = handleErr
-	})
-
 	valuerecorder := Must(meter).NewFloat64ValueRecorder("name.valuerecorder")
 
 	valuerecorder.Record(ctx, math.NaN())
-	require.Equal(t, aggregator.ErrNaNInput, sdkErr)
-	sdkErr = nil
+	require.Equal(t, aggregator.ErrNaNInput, testHandler.Flush())
 
 	checkpointed := sdk.Collect(ctx)
 	require.Equal(t, 0, checkpointed)
@@ -185,7 +176,7 @@ func TestInputRangeValueRecorder(t *testing.T) {
 	count, err := integrator.records[0].Aggregator().(aggregator.Distribution).Count()
 	require.Equal(t, int64(2), count)
 	require.Equal(t, 1, checkpointed)
-	require.Nil(t, sdkErr)
+	require.Nil(t, testHandler.Flush())
 	require.Nil(t, err)
 }
 
@@ -204,17 +195,13 @@ func TestDisabledInstrument(t *testing.T) {
 
 func TestRecordNaN(t *testing.T) {
 	ctx := context.Background()
-	meter, sdk, _ := newSDK(t)
+	meter, _, _ := newSDK(t)
 
-	var sdkErr error
-	sdk.SetErrorHandler(func(handleErr error) {
-		sdkErr = handleErr
-	})
 	c := Must(meter).NewFloat64Counter("sum.name")
 
-	require.Nil(t, sdkErr)
+	require.Nil(t, testHandler.Flush())
 	c.Add(ctx, math.NaN())
-	require.Error(t, sdkErr)
+	require.Error(t, testHandler.Flush())
 }
 
 func TestSDKLabelsDeduplication(t *testing.T) {
@@ -395,15 +382,15 @@ func TestSumObserverInputRange(t *testing.T) {
 
 	_ = Must(meter).NewFloat64SumObserver("float.sumobserver", func(_ context.Context, result metric.Float64ObserverResult) {
 		result.Observe(-2, kv.String("A", "B"))
-		require.Equal(t, aggregator.ErrNegativeInput, integrator.sdkErr())
+		require.Equal(t, aggregator.ErrNegativeInput, testHandler.Flush())
 		result.Observe(-1, kv.String("C", "D"))
-		require.Equal(t, aggregator.ErrNegativeInput, integrator.sdkErr())
+		require.Equal(t, aggregator.ErrNegativeInput, testHandler.Flush())
 	})
 	_ = Must(meter).NewInt64SumObserver("int.sumobserver", func(_ context.Context, result metric.Int64ObserverResult) {
 		result.Observe(-1, kv.String("A", "B"))
-		require.Equal(t, aggregator.ErrNegativeInput, integrator.sdkErr())
+		require.Equal(t, aggregator.ErrNegativeInput, testHandler.Flush())
 		result.Observe(-1)
-		require.Equal(t, aggregator.ErrNegativeInput, integrator.sdkErr())
+		require.Equal(t, aggregator.ErrNegativeInput, testHandler.Flush())
 	})
 
 	collected := sdk.Collect(ctx)
@@ -412,7 +399,7 @@ func TestSumObserverInputRange(t *testing.T) {
 	require.Equal(t, 0, len(integrator.records))
 
 	// check that the error condition was reset
-	require.NoError(t, integrator.sdkErr())
+	require.NoError(t, testHandler.Flush())
 }
 
 func TestObserverBatch(t *testing.T) {
@@ -553,7 +540,7 @@ func TestIncorrectInstruments(t *testing.T) {
 	var observer metric.Int64ValueObserver
 
 	ctx := context.Background()
-	meter, sdk, integrator := newSDK(t)
+	meter, sdk, _ := newSDK(t)
 
 	// Now try with uninitialized instruments.
 	meter.RecordBatch(ctx, nil, counter.Measurement(1))
@@ -562,7 +549,7 @@ func TestIncorrectInstruments(t *testing.T) {
 	})
 
 	collected := sdk.Collect(ctx)
-	require.Equal(t, metricsdk.ErrUninitializedInstrument, integrator.sdkErr())
+	require.Equal(t, metricsdk.ErrUninitializedInstrument, testHandler.Flush())
 	require.Equal(t, 0, collected)
 
 	// Now try with instruments from another SDK.
@@ -579,7 +566,7 @@ func TestIncorrectInstruments(t *testing.T) {
 
 	collected = sdk.Collect(ctx)
 	require.Equal(t, 0, collected)
-	require.Equal(t, metricsdk.ErrUninitializedInstrument, integrator.sdkErr())
+	require.Equal(t, metricsdk.ErrUninitializedInstrument, testHandler.Flush())
 }
 
 func TestSyncInAsync(t *testing.T) {

sdk/metric/sdk.go

@@ -17,11 +17,11 @@ package metric
 import (
 	"context"
 	"fmt"
-	"os"
 	"runtime"
 	"sync"
 	"sync/atomic"
 
+	"go.opentelemetry.io/otel/api/global"
 	"go.opentelemetry.io/otel/api/kv"
 	"go.opentelemetry.io/otel/api/label"
 	"go.opentelemetry.io/otel/api/metric"
@@ -62,9 +62,6 @@ type (
 		// collectLock prevents simultaneous calls to Collect().
 		collectLock sync.Mutex
 
-		// errorHandler supports delivering errors to the user.
-		errorHandler ErrorHandler
-
 		// asyncSortSlice has a single purpose - as a temporary
 		// place for sorting during labels creation to avoid
 		// allocation.  It is cleared after use.
@@ -143,8 +140,6 @@ type (
 		labels        *label.Set
 		recorder      export.Aggregator
 	}
-
-	ErrorHandler func(error)
 )
 
 var (
@@ -170,7 +165,7 @@ func (s *syncInstrument) Implementation() interface{} {
 
 func (a *asyncInstrument) observe(number api.Number, labels *label.Set) {
 	if err := aggregator.RangeTest(number, &a.descriptor); err != nil {
-		a.meter.errorHandler(err)
+		global.Handle(err)
 		return
 	}
 	recorder := a.getRecorder(labels)
@@ -180,7 +175,7 @@ func (a *asyncInstrument) observe(number api.Number, labels *label.Set) {
 		return
 	}
 	if err := recorder.Update(context.Background(), number, &a.descriptor); err != nil {
-		a.meter.errorHandler(err)
+		global.Handle(err)
 		return
 	}
 }
@@ -213,10 +208,6 @@ func (a *asyncInstrument) getRecorder(labels *label.Set) export.Aggregator {
 	return rec
 }
 
-func (m *Accumulator) SetErrorHandler(f ErrorHandler) {
-	m.errorHandler = f
-}
-
 // acquireHandle gets or creates a `*record` corresponding to `kvs`,
 // the input labels.  The second argument `labels` is passed in to
 // support re-use of the orderedLabels computed by a previous
@@ -314,25 +305,18 @@ func (s *syncInstrument) RecordOne(ctx context.Context, number api.Number, kvs [
 // current metric values.  A push-based integrator should configure its
 // own periodic collection.
 func NewAccumulator(integrator export.Integrator, opts ...Option) *Accumulator {
-	c := &Config{ErrorHandler: DefaultErrorHandler}
+	c := &Config{}
 	for _, opt := range opts {
 		opt.Apply(c)
 	}
 
 	return &Accumulator{
 		integrator:       integrator,
-		errorHandler:     c.ErrorHandler,
-		asyncInstruments: internal.NewAsyncInstrumentState(c.ErrorHandler),
+		asyncInstruments: internal.NewAsyncInstrumentState(),
 		resource:         c.Resource,
 	}
 }
 
-// DefaultErrorHandler is used when the user does not configure an
-// error handler.  Prints messages to os.Stderr.
-func DefaultErrorHandler(err error) {
-	fmt.Fprintln(os.Stderr, "Metrics Accumulator error:", err)
-}
-
 // NewSyncInstrument implements api.MetricImpl.
 func (m *Accumulator) NewSyncInstrument(descriptor api.Descriptor) (api.SyncImpl, error) {
 	return &syncInstrument{
@@ -485,7 +469,7 @@ func (m *Accumulator) checkpoint(ctx context.Context, descriptor *metric.Descrip
 	exportRecord := export.NewRecord(descriptor, labels, m.resource, recorder)
 	err := m.integrator.Process(ctx, exportRecord)
 	if err != nil {
-		m.errorHandler(err)
+		global.Handle(err)
 	}
 	return 1
 }
@@ -521,11 +505,11 @@ func (r *record) RecordOne(ctx context.Context, number api.Number) {
 		return
 	}
 	if err := aggregator.RangeTest(number, &r.inst.descriptor); err != nil {
-		r.inst.meter.errorHandler(err)
+		global.Handle(err)
 		return
 	}
 	if err := r.recorder.Update(ctx, number, &r.inst.descriptor); err != nil {
-		r.inst.meter.errorHandler(err)
+		global.Handle(err)
 		return
 	}
 	// Record was modified, inform the Collect() that things need
@@ -553,7 +537,7 @@ func (m *Accumulator) fromSync(sync metric.SyncImpl) *syncInstrument {
 			return inst
 		}
 	}
-	m.errorHandler(ErrUninitializedInstrument)
+	global.Handle(ErrUninitializedInstrument)
 	return nil
 }
 
@@ -565,6 +549,6 @@ func (m *Accumulator) fromAsync(async metric.AsyncImpl) *asyncInstrument {
 			return inst
 		}
 	}
-	m.errorHandler(ErrUninitializedInstrument)
+	global.Handle(ErrUninitializedInstrument)
 	return nil
 }