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119 lines
3.4 KiB
119 lines
3.4 KiB
/* |
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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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