mirror of https://github.com/prometheus/prometheus
58 lines
1.7 KiB
Go
58 lines
1.7 KiB
Go
// Copyright 2016 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gensupport
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import (
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"encoding/json"
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"errors"
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"fmt"
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"math"
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)
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// JSONFloat64 is a float64 that supports proper unmarshaling of special float
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// values in JSON, according to
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// https://developers.google.com/protocol-buffers/docs/proto3#json. Although
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// that is a proto-to-JSON spec, it applies to all Google APIs.
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//
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// The jsonpb package
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// (https://github.com/golang/protobuf/blob/master/jsonpb/jsonpb.go) has
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// similar functionality, but only for direct translation from proto messages
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// to JSON.
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type JSONFloat64 float64
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func (f *JSONFloat64) UnmarshalJSON(data []byte) error {
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var ff float64
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if err := json.Unmarshal(data, &ff); err == nil {
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*f = JSONFloat64(ff)
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return nil
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}
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var s string
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if err := json.Unmarshal(data, &s); err == nil {
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switch s {
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case "NaN":
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ff = math.NaN()
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case "Infinity":
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ff = math.Inf(1)
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case "-Infinity":
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ff = math.Inf(-1)
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default:
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return fmt.Errorf("google.golang.org/api/internal: bad float string %q", s)
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}
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*f = JSONFloat64(ff)
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return nil
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}
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return errors.New("google.golang.org/api/internal: data not float or string")
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}
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