gh-ost/go/mysql/instance_key_map.go
Shlomi Noach 5deff2adb6 - working POC of row-copy iteration cycle
- initial work on table columns
- initial work on events streamer
2016-04-06 13:05:58 +02:00

96 lines
2.2 KiB
Go

/*
Copyright 2015 Shlomi Noach, courtesy Booking.com
See https://github.com/github/gh-osc/blob/master/LICENSE
*/
package mysql
import (
"encoding/json"
"strings"
)
// InstanceKeyMap is a convenience struct for listing InstanceKey-s
type InstanceKeyMap map[InstanceKey]bool
func NewInstanceKeyMap() *InstanceKeyMap {
return &InstanceKeyMap{}
}
// AddKey adds a single key to this map
func (this *InstanceKeyMap) AddKey(key InstanceKey) {
(*this)[key] = true
}
// AddKeys adds all given keys to this map
func (this *InstanceKeyMap) AddKeys(keys []InstanceKey) {
for _, key := range keys {
this.AddKey(key)
}
}
// HasKey checks if given key is within the map
func (this *InstanceKeyMap) HasKey(key InstanceKey) bool {
_, ok := (*this)[key]
return ok
}
// GetInstanceKeys returns keys in this map in the form of an array
func (this *InstanceKeyMap) GetInstanceKeys() []InstanceKey {
res := []InstanceKey{}
for key := range *this {
res = append(res, key)
}
return res
}
// MarshalJSON will marshal this map as JSON
func (this *InstanceKeyMap) MarshalJSON() ([]byte, error) {
return json.Marshal(this.GetInstanceKeys())
}
// ToJSON will marshal this map as JSON
func (this *InstanceKeyMap) ToJSON() (string, error) {
bytes, err := this.MarshalJSON()
return string(bytes), err
}
// ToJSONString will marshal this map as JSON
func (this *InstanceKeyMap) ToJSONString() string {
s, _ := this.ToJSON()
return s
}
// ToCommaDelimitedList will export this map in comma delimited format
func (this *InstanceKeyMap) ToCommaDelimitedList() string {
keyDisplays := []string{}
for key := range *this {
keyDisplays = append(keyDisplays, key.DisplayString())
}
return strings.Join(keyDisplays, ",")
}
// ReadJson unmarshalls a json into this map
func (this *InstanceKeyMap) ReadJson(jsonString string) error {
var keys []InstanceKey
err := json.Unmarshal([]byte(jsonString), &keys)
if err != nil {
return err
}
this.AddKeys(keys)
return err
}
// ReadJson unmarshalls a json into this map
func (this *InstanceKeyMap) ReadCommaDelimitedList(list string) error {
tokens := strings.Split(list, ",")
for _, token := range tokens {
key, err := ParseRawInstanceKeyLoose(token)
if err != nil {
return err
}
this.AddKey(*key)
}
return nil
}