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// 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 "go.opentelemetry.io/otel/metric"
import "go.opentelemetry.io/otel/attribute"
// MeterConfig contains options for Meters.
type MeterConfig struct {
instrumentationVersion string
schemaURL string
attrs attribute.Set
// Ensure forward compatibility by explicitly making this not comparable.
noCmp [0]func() //nolint: unused // This is indeed used.
}
// InstrumentationVersion returns the version of the library providing
// instrumentation.
func (cfg MeterConfig) InstrumentationVersion() string {
return cfg.instrumentationVersion
}
// InstrumentationAttributes returns the attributes associated with the library
// providing instrumentation.
func (cfg MeterConfig) InstrumentationAttributes() attribute.Set {
return cfg.attrs
}
// SchemaURL is the schema_url of the library providing instrumentation.
func (cfg MeterConfig) SchemaURL() string {
return cfg.schemaURL
}
// MeterOption is an interface for applying Meter options.
type MeterOption interface {
// applyMeter is used to set a MeterOption value of a MeterConfig.
applyMeter(MeterConfig) MeterConfig
}
// NewMeterConfig creates a new MeterConfig and applies
// all the given options.
func NewMeterConfig(opts ...MeterOption) MeterConfig {
var config MeterConfig
for _, o := range opts {
config = o.applyMeter(config)
}
return config
}
type meterOptionFunc func(MeterConfig) MeterConfig
func (fn meterOptionFunc) applyMeter(cfg MeterConfig) MeterConfig {
return fn(cfg)
}
// WithInstrumentationVersion sets the instrumentation version.
func WithInstrumentationVersion(version string) MeterOption {
return meterOptionFunc(func(config MeterConfig) MeterConfig {
config.instrumentationVersion = version
return config
})
}
// WithInstrumentationAttributes sets the instrumentation attributes.
//
// The passed attributes will be de-duplicated.
func WithInstrumentationAttributes(attr ...attribute.KeyValue) MeterOption {
return meterOptionFunc(func(config MeterConfig) MeterConfig {
config.attrs = attribute.NewSet(attr...)
return config
})
}
// WithSchemaURL sets the schema URL.
func WithSchemaURL(schemaURL string) MeterOption {
return meterOptionFunc(func(config MeterConfig) MeterConfig {
config.schemaURL = schemaURL
return config
})
}
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