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db.go
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db.go
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package db
import (
"fmt"
"time"
)
// InMemDB is a simple in memory database.
type InMemDB struct {
data map[string]map[time.Time]interface{}
}
// NewDatabase instantiates a new instance of a database.
func NewDatabase() *InMemDB {
return &InMemDB{
data: make(map[string]map[time.Time]interface{}),
}
}
// Set creates a new entry into an existing database.
func (db *InMemDB) Set(key string, value interface{}) time.Time {
t := time.Now()
if v, ok := db.data[key]; ok {
// Here we need to update v
v[t] = value
return t
}
newVal := make(map[time.Time]interface{})
newVal[t] = value
db.data[key] = newVal
return t
}
// Get attempts to retrieve the supplied key from an existing database.
func (db *InMemDB) Get(key string) interface{} {
if v, ok := db.data[key]; ok {
var ot time.Time
var finalValue interface{}
for t, val := range v {
if t.After(ot) {
ot = t
finalValue = val
}
}
return finalValue
}
fmt.Println("Value is not in database")
return nil
}
// Get attempts to retrieve the supplied key from an existing database.
func (db *InMemDB) GetForTime(key string, t time.Time) (interface{}, bool) {
if v, ok := db.data[key]; ok {
if finalValue, ok := v[t]; ok {
return finalValue, true
}
}
fmt.Println("No value for:", key, "at:", t, "found in database.")
return nil, false
}
// Print is a helper method to print each entry in a database to it's own line.
func (db *InMemDB) Print() {
for k, v := range db.data {
fmt.Printf("%v: %v\n", k, v)
}
}