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gorage.go
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gorage.go
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package Gorage
import (
"encoding/json"
"io"
"os"
"sync"
)
type Gorage struct {
AllowDuplicated bool
Log bool
Path string
Tables []Table
memOnly bool
}
/*
Select a table from the loaded Gorage
*/
func (g *Gorage) FromTable(name string) *Table {
k := -1
for i, v := range g.Tables {
if v.Name == name {
k = i
break
}
}
c := make(chan *Table)
if g.Tables[k].t.q == nil {
g.Tables[k].t.q = newQueue(&data{
action: actionFromTable,
c: c,
})
} else {
g.Tables[k].t.q.append(&data{
action: actionFromTable,
c: c,
})
}
for {
select {
case <-c:
close(c)
return &g.Tables[k]
}
}
}
func (g *Gorage) copyTableToTable(name string, t *Table) {
if !g.TableExists(name) {
return
}
for i, v := range g.Tables {
if v.Name == name {
g.Tables[i].Columns = t.Columns
g.Tables[i].Rows = t.Rows
}
}
}
func (g *Gorage) copyTable(name string) Table {
if !g.TableExists(name) {
return Table{}
}
for _, v := range g.Tables {
if v.Name == name {
t := Table{
host: v.host,
p: v.p,
}
if v.t.q != nil && v.t.q.n != nil {
t.t.q = v.t.q.n
}
for _, c := range v.Columns {
t.Columns = append(t.Columns, c)
}
for _, r := range v.Rows {
var a []interface{}
for _, t1 := range r {
a = append(a, t1)
}
t.Rows = append(t.Rows, a)
}
return t
}
}
return Table{}
}
func (g *Gorage) RemoveTable(name string) *Gorage {
if !g.TableExists(name) {
return g
}
for i, v := range g.Tables {
if v.Name == name {
c := make(chan *Table)
if g.Tables[i].t.q == nil {
g.Tables[i].t.q = newQueue(&data{
action: actionDeleteTable,
c: c,
})
} else {
g.Tables[i].t.q.append(&data{
action: actionDeleteTable,
c: c,
})
}
select {
case <-c:
close(c)
break
}
g.Tables = append(g.Tables[:i], g.Tables[i+1:]...)
}
}
return g
}
/*
Check if a given table exists
*/
func (g *Gorage) TableExists(name string) bool {
for _, v := range g.Tables {
if v.Name == name {
return true
}
}
return false
}
/*
Create a table.
Two tables with the same name in the same gorage are NOT possible
*/
func (g *Gorage) CreateTable(name string) *Table {
if g.TableExists(name) {
if g.Log {
gprint("CreateTable", "Table already exists")
}
return nil
}
t := Table{
Name: name,
host: g,
Columns: []Column{},
Rows: [][]interface{}{},
p: true,
}
g.Tables = append(g.Tables, t)
go transactionManger(&g.Tables[len(g.Tables)-1])
return &g.Tables[len(g.Tables)-1]
}
/*
Save the loaded gorage
*/
func (g *Gorage) Save() {
if g.memOnly {
return
}
err := os.Truncate(g.Path, 0)
if err != nil {
panic(err.Error())
}
file, _ := json.MarshalIndent(g, "", " ")
err = os.WriteFile(g.Path, file, 0644)
if err != nil {
panic(err.Error())
}
}
/*
Open a gorage from a path
*/
func Open(path string) *Gorage {
f, err := os.Open(path)
if err != nil {
panic(err.Error())
}
defer f.Close()
b, _ := io.ReadAll(f)
var g Gorage
err = json.Unmarshal(b, &g)
if err != nil {
panic(err.Error())
}
for i, _ := range g.Tables {
g.Tables[i].host = &g
g.Tables[i].p = true
go transactionManger(&g.Tables[i])
}
return &g
}
func CreateMemOnly(allowDuplicates, log bool) *Gorage {
return &Gorage{
AllowDuplicated: allowDuplicates,
Log: log,
memOnly: true,
}
}
/*
Create a new Gorage
path: the path where it should be stored
allowDuplicates: If a table can contain multiple identical datasets
log: If you want to get spammed :^)
*/
func Create(path string, allowDuplicates, log bool) *Gorage {
if !fileExists(path) {
f, err := os.Create(path)
if err != nil {
panic(err.Error())
}
err = f.Close()
if err != nil {
panic(err.Error())
}
g := Gorage{
Log: log,
AllowDuplicated: allowDuplicates,
Path: path,
Tables: []Table{},
}
file, _ := json.MarshalIndent(g, "", " ")
err = os.WriteFile(path, file, 0644)
if err != nil {
panic(err.Error())
}
}
return Open(path)
}
func (g *Gorage) Close() {
var w sync.WaitGroup
for i, _ := range g.Tables {
g.Tables[i].sendExit()
go func(i int) {
defer w.Done()
w.Add(1)
for g.Tables[i].t.q.Head() != nil {
}
}(i)
}
w.Wait()
g.Save()
}