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/
metrics.go
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/
metrics.go
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// Copyright 2017 Google Inc.
//
// 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 metrics implements data types for probes generated data.
package metrics
import (
"errors"
"strconv"
"strings"
)
// Value represents any metric value
type Value interface {
Clone() Value
Add(delta Value) error
AddInt64(i int64)
AddFloat64(f float64)
String() string
}
// NumValue represents any numerical metric value, e.g. Int, Float.
// It's a superset of Value interface.
type NumValue interface {
Value
Inc()
Int64() int64
Float64() float64
IncBy(delta NumValue)
}
// ParseValueFromString parses a value from its string representation
func ParseValueFromString(val string) (Value, error) {
c := val[0]
switch {
// A float value
case '0' <= c && c <= '9':
f, err := strconv.ParseFloat(val, 64)
if err != nil {
return nil, err
}
return NewFloat(f), nil
// A map value
case c == 'm':
if !strings.HasPrefix(val, "map") {
break
}
return ParseMapFromString(val)
// A string value
case c == '"':
return NewString(strings.Trim(val, "\"")), nil
// A distribution value
case c == 'd':
if !strings.HasPrefix(val, "dist") {
break
}
distVal, err := ParseDistFromString(val)
if err != nil {
return nil, err
}
return distVal, nil
}
return nil, errors.New("unknown value type")
}