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// Supporting reading and writing key-value pairs to disk.
package kv
import (
"encoding/json"
"io/ioutil"
"log"
"path"
)
// Return the decoded store from disk.
func getStore(storePath string) map[string]interface{} {
b, err := ioutil.ReadFile(path.Join(storePath, "kv.json"))
if err != nil {
log.Fatal("Could not read store: ", err)
}
var state map[string]interface{}
err = json.Unmarshal(b, &state)
if err != nil {
log.Fatal("Could not decode store as JSON: ", err)
}
return state
}
// Set `key` to `value` in the store.
func Set(storePath string, key string, value interface{}) error {
state := getStore(storePath)
state[key] = value
b, err := json.Marshal(state)
if err != nil {
log.Fatal("Could not encode state as JSON: ", err)
}
return ioutil.WriteFile(path.Join(storePath, "kv.json"), b, 0644)
}
// Get `key` from the store.
func Get(storePath string, key string) interface{} {
return getStore(path.Join(storePath, "kv.json"))[key]
}
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