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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package metric
import (
"context"
"fmt"
"testing"
"github.com/google/go-cmp/cmp"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.opentelemetry.io/otel/attribute"
ottest "go.opentelemetry.io/otel/sdk/internal/internaltest"
"go.opentelemetry.io/otel/sdk/metric/metricdata"
"go.opentelemetry.io/otel/sdk/resource"
)
type reader struct {
producer sdkProducer
externalProducers []Producer
temporalityFunc TemporalitySelector
aggregationFunc AggregationSelector
collectFunc func(context.Context, *metricdata.ResourceMetrics) error
forceFlushFunc func(context.Context) error
shutdownFunc func(context.Context) error
}
const envVarResourceAttributes = "OTEL_RESOURCE_ATTRIBUTES"
var _ Reader = (*reader)(nil)
func (r *reader) aggregation(kind InstrumentKind) Aggregation { // nolint:revive // import-shadow for method scoped by type.
return r.aggregationFunc(kind)
}
func (r *reader) register(p sdkProducer) { r.producer = p }
func (r *reader) RegisterProducer(p Producer) { r.externalProducers = append(r.externalProducers, p) }
func (r *reader) temporality(kind InstrumentKind) metricdata.Temporality {
return r.temporalityFunc(kind)
}
func (r *reader) Collect(ctx context.Context, rm *metricdata.ResourceMetrics) error {
return r.collectFunc(ctx, rm)
}
func (r *reader) ForceFlush(ctx context.Context) error { return r.forceFlushFunc(ctx) }
func (r *reader) Shutdown(ctx context.Context) error { return r.shutdownFunc(ctx) }
func TestConfigReaderSignalsEmpty(t *testing.T) {
f, s := config{}.readerSignals()
require.NotNil(t, f)
require.NotNil(t, s)
ctx := context.Background()
assert.NoError(t, f(ctx))
assert.NoError(t, s(ctx))
assert.ErrorIs(t, s(ctx), ErrReaderShutdown)
}
func TestConfigReaderSignalsForwarded(t *testing.T) {
var flush, sdown int
r := &reader{
forceFlushFunc: func(ctx context.Context) error {
flush++
return nil
},
shutdownFunc: func(ctx context.Context) error {
sdown++
return nil
},
}
c := newConfig([]Option{WithReader(r)})
f, s := c.readerSignals()
require.NotNil(t, f)
require.NotNil(t, s)
ctx := context.Background()
assert.NoError(t, f(ctx))
assert.NoError(t, f(ctx))
assert.NoError(t, s(ctx))
assert.ErrorIs(t, s(ctx), ErrReaderShutdown)
assert.Equal(t, 2, flush, "flush not called 2 times")
assert.Equal(t, 1, sdown, "shutdown not called 1 time")
}
func TestConfigReaderSignalsForwardedErrors(t *testing.T) {
r := &reader{
forceFlushFunc: func(ctx context.Context) error { return assert.AnError },
shutdownFunc: func(ctx context.Context) error { return assert.AnError },
}
c := newConfig([]Option{WithReader(r)})
f, s := c.readerSignals()
require.NotNil(t, f)
require.NotNil(t, s)
ctx := context.Background()
assert.ErrorIs(t, f(ctx), assert.AnError)
assert.ErrorIs(t, s(ctx), assert.AnError)
assert.ErrorIs(t, s(ctx), ErrReaderShutdown)
}
func TestUnifyMultiError(t *testing.T) {
f := func(context.Context) error { return assert.AnError }
funcs := []func(context.Context) error{f, f, f}
errs := []error{assert.AnError, assert.AnError, assert.AnError}
target := fmt.Errorf("%v", errs)
assert.Equal(t, unify(funcs)(context.Background()), target)
}
func mergeResource(t *testing.T, r1, r2 *resource.Resource) *resource.Resource {
r, err := resource.Merge(r1, r2)
assert.NoError(t, err)
return r
}
func TestWithResource(t *testing.T) {
store, err := ottest.SetEnvVariables(map[string]string{
envVarResourceAttributes: "key=value,rk5=7",
})
require.NoError(t, err)
defer func() { require.NoError(t, store.Restore()) }()
cases := []struct {
name string
options []Option
want *resource.Resource
msg string
}{
{
name: "explicitly empty resource",
options: []Option{WithResource(resource.Empty())},
want: resource.Environment(),
},
{
name: "uses default if no resource option",
options: []Option{},
want: resource.Default(),
},
{
name: "explicit resource",
options: []Option{WithResource(resource.NewSchemaless(attribute.String("rk1", "rv1"), attribute.Int64("rk2", 5)))},
want: mergeResource(t, resource.Environment(), resource.NewSchemaless(attribute.String("rk1", "rv1"), attribute.Int64("rk2", 5))),
},
{
name: "last resource wins",
options: []Option{
WithResource(resource.NewSchemaless(attribute.String("rk1", "vk1"), attribute.Int64("rk2", 5))),
WithResource(resource.NewSchemaless(attribute.String("rk3", "rv3"), attribute.Int64("rk4", 10))),
},
want: mergeResource(t, resource.Environment(), resource.NewSchemaless(attribute.String("rk3", "rv3"), attribute.Int64("rk4", 10))),
},
{
name: "overlapping attributes with environment resource",
options: []Option{WithResource(resource.NewSchemaless(attribute.String("rk1", "rv1"), attribute.Int64("rk5", 10)))},
want: mergeResource(t, resource.Environment(), resource.NewSchemaless(attribute.String("rk1", "rv1"), attribute.Int64("rk5", 10))),
},
}
for _, tc := range cases {
tc := tc
t.Run(tc.name, func(t *testing.T) {
got := newConfig(tc.options).res
if diff := cmp.Diff(got, tc.want); diff != "" {
t.Errorf("WithResource:\n -got +want %s", diff)
}
})
}
}
func TestWithReader(t *testing.T) {
r := &reader{}
c := newConfig([]Option{WithReader(r)})
require.Len(t, c.readers, 1)
assert.Same(t, r, c.readers[0])
}
func TestWithView(t *testing.T) {
c := newConfig([]Option{WithView(
NewView(
Instrument{Kind: InstrumentKindObservableCounter},
Stream{Name: "a"},
),
NewView(
Instrument{Kind: InstrumentKindCounter},
Stream{Name: "b"},
),
)})
assert.Len(t, c.views, 2)
}
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