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types.go
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types.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package metric
import (
"fmt"
"strings"
"github.com/m3db/m3/src/metrics/generated/proto/metricpb"
)
// Type is a metric type.
type Type int
// A list of supported metric types.
const (
UnknownType Type = iota
CounterType
TimerType
GaugeType
)
// validTypes is a list of valid types.
var validTypes = []Type{
CounterType,
TimerType,
GaugeType,
}
func (t Type) String() string {
switch t {
case UnknownType:
return "unknown"
case CounterType:
return "counter"
case TimerType:
return "timer"
case GaugeType:
return "gauge"
default:
return fmt.Sprintf("unknown type: %d", t)
}
}
// ToProto converts the metric type to a protobuf message in place.
func (t Type) ToProto(pb *metricpb.MetricType) error {
switch t {
case UnknownType:
*pb = metricpb.MetricType_UNKNOWN
case CounterType:
*pb = metricpb.MetricType_COUNTER
case TimerType:
*pb = metricpb.MetricType_TIMER
case GaugeType:
*pb = metricpb.MetricType_GAUGE
default:
return fmt.Errorf("unknown metric type: %v", t)
}
return nil
}
// FromProto converts the protobuf message to a metric type.
func (t *Type) FromProto(pb metricpb.MetricType) error {
switch pb {
case metricpb.MetricType_UNKNOWN:
*t = UnknownType
case metricpb.MetricType_COUNTER:
*t = CounterType
case metricpb.MetricType_TIMER:
*t = TimerType
case metricpb.MetricType_GAUGE:
*t = GaugeType
default:
return fmt.Errorf("unknown metric type in proto: %v", pb)
}
return nil
}
// ParseType parses a type string and returns the type.
func ParseType(typeStr string) (Type, error) {
validTypeStrs := make([]string, 0, len(validTypes))
for _, valid := range validTypes {
if typeStr == valid.String() {
return valid, nil
}
validTypeStrs = append(validTypeStrs, valid.String())
}
return UnknownType, fmt.Errorf("invalid metric type '%s', valid types are: %s",
typeStr, strings.Join(validTypeStrs, ", "))
}
// MustParseType parses a type string and panics if the input in invalid.
func MustParseType(typeStr string) Type {
t, err := ParseType(typeStr)
if err != nil {
panic(err.Error())
}
return t
}
// UnmarshalYAML unmarshals YAML object into a metric type.
func (t *Type) UnmarshalYAML(unmarshal func(interface{}) error) error {
var str string
if err := unmarshal(&str); err != nil {
return err
}
mt, err := ParseType(str)
if err != nil {
return err
}
*t = mt
return nil
}