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map.go
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map.go
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// Copyright 2020 Douyu
//
// 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 xmap
import (
"fmt"
"reflect"
"strings"
"sync"
"time"
"github.com/douyu/jupiter/pkg/util/xcast"
"github.com/mitchellh/mapstructure"
)
// Unmarshaller ...
type Unmarshaller = func([]byte, interface{}) error
// KeySpliter ...
var KeySpliter = "."
// FlatMap ...
type FlatMap struct {
data map[string]interface{}
mu sync.RWMutex
keyMap sync.Map
}
// NewFlatMap ...
func NewFlatMap() *FlatMap {
return &FlatMap{
data: make(map[string]interface{}),
}
}
// Load ...
func (flat *FlatMap) Load(content []byte, unmarshal Unmarshaller) error {
data := make(map[string]interface{})
if err := unmarshal(content, &data); err != nil {
return err
}
return flat.apply(data)
}
func (flat *FlatMap) apply(data map[string]interface{}) error {
flat.mu.Lock()
defer flat.mu.Unlock()
MergeStringMap(flat.data, data)
var changes = make(map[string]interface{})
for k, v := range flat.traverse(KeySpliter) {
orig, ok := flat.keyMap.Load(k)
if ok && !reflect.DeepEqual(orig, v) {
changes[k] = v
}
flat.keyMap.Store(k, v)
}
return nil
}
// Set ...
func (flat *FlatMap) Set(key string, val interface{}) error {
paths := strings.Split(key, KeySpliter)
lastKey := paths[len(paths)-1]
m := deepSearch(flat.data, paths[:len(paths)-1])
m[lastKey] = val
return flat.apply(m)
}
// Get returns the value associated with the key
func (flat *FlatMap) Get(key string) interface{} {
return flat.find(key)
}
// GetString returns the value associated with the key as a string.
func (flat *FlatMap) GetString(key string) string {
return xcast.ToString(flat.Get(key))
}
// GetBool returns the value associated with the key as a boolean.
func (flat *FlatMap) GetBool(key string) bool {
return xcast.ToBool(flat.Get(key))
}
// GetInt returns the value associated with the key as an integer.
func (flat *FlatMap) GetInt(key string) int {
return xcast.ToInt(flat.Get(key))
}
// GetInt64 returns the value associated with the key as an integer.
func (flat *FlatMap) GetInt64(key string) int64 {
return xcast.ToInt64(flat.Get(key))
}
// GetFloat64 returns the value associated with the key as a float64.
func (flat *FlatMap) GetFloat64(key string) float64 {
return xcast.ToFloat64(flat.Get(key))
}
// GetTime returns the value associated with the key as time.
func (flat *FlatMap) GetTime(key string) time.Time {
return xcast.ToTime(flat.Get(key))
}
// GetDuration returns the value associated with the key as a duration.
func (flat *FlatMap) GetDuration(key string) time.Duration {
return xcast.ToDuration(flat.Get(key))
}
// GetStringSlice returns the value associated with the key as a slice of strings.
func (flat *FlatMap) GetStringSlice(key string) []string {
return xcast.ToStringSlice(flat.Get(key))
}
// GetSlice returns the value associated with the key as a slice of strings.
func (flat *FlatMap) GetSlice(key string) []interface{} {
return xcast.ToSlice(flat.Get(key))
}
// GetStringMap returns the value associated with the key as a map of interfaces.
func (flat *FlatMap) GetStringMap(key string) map[string]interface{} {
return xcast.ToStringMap(flat.Get(key))
}
// GetStringMapString returns the value associated with the key as a map of strings.
func (flat *FlatMap) GetStringMapString(key string) map[string]string {
return xcast.ToStringMapString(flat.Get(key))
}
// GetSliceStringMap returns the value associated with the slice of maps.
func (flat *FlatMap) GetSliceStringMap(key string) []map[string]interface{} {
return xcast.ToSliceStringMap(flat.Get(key))
}
// GetStringMapStringSlice returns the value associated with the key as a map to a slice of strings.
func (flat *FlatMap) GetStringMapStringSlice(key string) map[string][]string {
return xcast.ToStringMapStringSlice(flat.Get(key))
}
// UnmarshalKey takes a single key and unmarshal it into a Struct.
func (flat *FlatMap) UnmarshalKey(key string, rawVal interface{}, tagName string) error {
config := mapstructure.DecoderConfig{
DecodeHook: mapstructure.StringToTimeDurationHookFunc(),
Result: rawVal,
TagName: tagName,
}
decoder, err := mapstructure.NewDecoder(&config)
if err != nil {
return err
}
if key == "" {
flat.mu.RLock()
defer flat.mu.RUnlock()
return decoder.Decode(flat.data)
}
value := flat.Get(key)
if value == nil {
return fmt.Errorf("invalid key %s, maybe not exist in config", key)
}
return decoder.Decode(value)
}
// Reset ...
func (flat *FlatMap) Reset() {
flat.mu.Lock()
defer flat.mu.Unlock()
flat.data = make(map[string]interface{})
// erase map
flat.keyMap.Range(func(key interface{}, value interface{}) bool {
flat.keyMap.Delete(key)
return true
})
}
func (flat *FlatMap) find(key string) interface{} {
dd, ok := flat.keyMap.Load(key)
if ok {
return dd
}
paths := strings.Split(key, KeySpliter)
flat.mu.RLock()
defer flat.mu.RUnlock()
m := DeepSearchInMap(flat.data, paths[:len(paths)-1]...)
dd = m[paths[len(paths)-1]]
flat.keyMap.Store(key, dd)
return dd
}
func lookup(prefix string, target map[string]interface{}, data map[string]interface{}, sep string) {
for k, v := range target {
pp := fmt.Sprintf("%s%s%s", prefix, sep, k)
if prefix == "" {
pp = fmt.Sprintf("%s", k)
}
if dd, err := xcast.ToStringMapE(v); err == nil {
lookup(pp, dd, data, sep)
} else {
data[pp] = v
}
}
}
func (flat *FlatMap) traverse(sep string) map[string]interface{} {
data := make(map[string]interface{})
lookup("", flat.data, data, sep)
return data
}
func deepSearch(m map[string]interface{}, path []string) map[string]interface{} {
for _, k := range path {
m2, ok := m[k]
if !ok {
m3 := make(map[string]interface{})
m[k] = m3
m = m3
continue
}
m3, ok := m2.(map[string]interface{})
if !ok {
m3 = make(map[string]interface{})
m[k] = m3
}
m = m3
}
return m
}