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reader.go
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/
reader.go
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// Package reader parses change sets and provides config values
package reader
import (
"time"
"dario.cat/mergo"
"github.com/go-thor/thor/codec"
"github.com/go-thor/thor/codec/json"
"github.com/go-thor/thor/codec/toml"
"github.com/go-thor/thor/codec/xml"
"github.com/go-thor/thor/codec/yaml"
"github.com/go-thor/thor/config/source"
)
type (
// Reader is an interface for merging change sets
Reader interface {
Merge(...*source.ChangeSet) (*source.ChangeSet, error) // merge multi to one
}
reader struct {
targetCoder codec.Coder
sourceCoders map[string]codec.Coder
}
)
// NewReader creates a coder reader
func NewReader(opts ...Option) Reader {
options := Options{
TargetEncoder: json.NewCoder(),
SourceEncoders: map[string]codec.Coder{
"json": json.NewCoder(),
"yml": yaml.NewCoder(),
"yaml": yaml.NewCoder(),
"toml": toml.NewCoder(),
"xml": xml.NewCoder(),
},
}
for _, o := range opts {
o(&options)
}
return &reader{
targetCoder: options.TargetEncoder,
sourceCoders: options.SourceEncoders,
}
}
func (r *reader) Merge(changes ...*source.ChangeSet) (*source.ChangeSet, error) {
var merged map[string]interface{}
for _, change := range changes {
if change == nil || len(change.Data) == 0 {
continue
}
coder, ok := r.sourceCoders[change.Format]
if !ok {
// fallback
coder = r.targetCoder
}
var data map[string]interface{}
if err := coder.Unmarshal(change.Data, &data); err != nil {
return nil, err
}
if err := mergo.Map(&merged, data, mergo.WithOverride); err != nil {
return nil, err
}
}
data, err := r.targetCoder.Marshal(merged)
if err != nil {
return nil, err
}
cs := &source.ChangeSet{
Timestamp: time.Now(),
Data: data,
Source: "reader",
Format: r.targetCoder.String(),
}
cs.Sum()
return cs, nil
}