mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-18 03:24:05 -08:00
120 lines
3.4 KiB
Go
120 lines
3.4 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package json
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import (
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"bytes"
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"encoding/json"
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"io"
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)
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// NewEncoder delegates to json.NewEncoder
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// It is only here so this package can be a drop-in for common encoding/json uses
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func NewEncoder(w io.Writer) *json.Encoder {
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return json.NewEncoder(w)
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}
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// Marshal delegates to json.Marshal
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// It is only here so this package can be a drop-in for common encoding/json uses
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func Marshal(v interface{}) ([]byte, error) {
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return json.Marshal(v)
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}
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// Unmarshal unmarshals the given data
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// If v is a *map[string]interface{}, numbers are converted to int64 or float64
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func Unmarshal(data []byte, v interface{}) error {
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switch v := v.(type) {
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case *map[string]interface{}:
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// Build a decoder from the given data
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decoder := json.NewDecoder(bytes.NewBuffer(data))
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// Preserve numbers, rather than casting to float64 automatically
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decoder.UseNumber()
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// Run the decode
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if err := decoder.Decode(v); err != nil {
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return err
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}
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// If the decode succeeds, post-process the map to convert json.Number objects to int64 or float64
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return convertMapNumbers(*v)
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case *[]interface{}:
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// Build a decoder from the given data
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decoder := json.NewDecoder(bytes.NewBuffer(data))
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// Preserve numbers, rather than casting to float64 automatically
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decoder.UseNumber()
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// Run the decode
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if err := decoder.Decode(v); err != nil {
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return err
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}
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// If the decode succeeds, post-process the map to convert json.Number objects to int64 or float64
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return convertSliceNumbers(*v)
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default:
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return json.Unmarshal(data, v)
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}
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}
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// convertMapNumbers traverses the map, converting any json.Number values to int64 or float64.
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// values which are map[string]interface{} or []interface{} are recursively visited
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func convertMapNumbers(m map[string]interface{}) error {
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var err error
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for k, v := range m {
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switch v := v.(type) {
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case json.Number:
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m[k], err = convertNumber(v)
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case map[string]interface{}:
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err = convertMapNumbers(v)
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case []interface{}:
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err = convertSliceNumbers(v)
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}
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if err != nil {
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return err
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}
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}
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return nil
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}
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// convertSliceNumbers traverses the slice, converting any json.Number values to int64 or float64.
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// values which are map[string]interface{} or []interface{} are recursively visited
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func convertSliceNumbers(s []interface{}) error {
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var err error
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for i, v := range s {
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switch v := v.(type) {
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case json.Number:
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s[i], err = convertNumber(v)
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case map[string]interface{}:
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err = convertMapNumbers(v)
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case []interface{}:
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err = convertSliceNumbers(v)
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}
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if err != nil {
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return err
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}
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}
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return nil
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}
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// convertNumber converts a json.Number to an int64 or float64, or returns an error
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func convertNumber(n json.Number) (interface{}, error) {
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// Attempt to convert to an int64 first
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if i, err := n.Int64(); err == nil {
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return i, nil
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}
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// Return a float64 (default json.Decode() behavior)
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// An overflow will return an error
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return n.Float64()
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}
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