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fifo.go
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fifo.go
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package fifo
import (
"database/sql"
"errors"
"github.com/esrrhs/go-engine/src/loggo"
_ "github.com/mattn/go-sqlite3"
"strconv"
)
type FiFo struct {
name string
max int
db *sql.DB
insertJobStmt *sql.Stmt
getJobStmt *sql.Stmt
deleteJobStmt *sql.Stmt
sizeDoneStmt *sql.Stmt
}
func NewFIFO(dsn string, conn int, name string) (*FiFo, error) {
f := &FiFo{name: name}
gdb, err := sql.Open("mysql", dsn)
if err != nil {
loggo.Error("open mysql fail %v", err)
return nil, err
}
err = gdb.Ping()
if err != nil {
loggo.Error("open mysql fail %v", err)
return nil, err
}
gdb.SetConnMaxLifetime(0)
gdb.SetMaxIdleConns(conn)
gdb.SetMaxOpenConns(conn)
_, err = gdb.Exec("CREATE DATABASE IF NOT EXISTS fifo")
if err != nil {
loggo.Error("CREATE DATABASE fail %v", err)
return nil, err
}
_, err = gdb.Exec("CREATE TABLE IF NOT EXISTS fifo." + name + " (" +
"id int NOT NULL AUTO_INCREMENT," +
"data text NOT NULL," +
"PRIMARY KEY (id)" +
"); ")
if err != nil {
loggo.Error("CREATE TABLE fail %v", err)
return nil, err
}
stmt, err := gdb.Prepare("insert into fifo." + name + "(data) values(?)")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.insertJobStmt = stmt
stmt, err = gdb.Prepare("select id,data from fifo." + name + " limit 0,?")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.getJobStmt = stmt
stmt, err = gdb.Prepare("delete from fifo." + name + " where id = ?")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.deleteJobStmt = stmt
stmt, err = gdb.Prepare("select count(*) from fifo." + name + "")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.sizeDoneStmt = stmt
return f, nil
}
func NewFIFOLocal(name string, max int) (*FiFo, error) {
f := &FiFo{name: name, max: max}
gdb, err := sql.Open("sqlite3", "./fifo_"+name+".db")
if err != nil {
loggo.Error("open sqlite3 Job fail %v", err)
return nil, err
}
f.db = gdb
gdb.Exec("CREATE TABLE IF NOT EXISTS [data_info](" +
"[id] INTEGER PRIMARY KEY AUTOINCREMENT," +
"[data] TEXT NOT NULL);")
stmt, err := gdb.Prepare("insert into data_info(data) values(?)")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.insertJobStmt = stmt
stmt, err = gdb.Prepare("select id,data from data_info limit 0,?")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.getJobStmt = stmt
stmt, err = gdb.Prepare("delete from data_info where id = ?")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.deleteJobStmt = stmt
stmt, err = gdb.Prepare("select count(*) from data_info")
if err != nil {
loggo.Error("Prepare sqlite3 fail %v", err)
return nil, err
}
f.sizeDoneStmt = stmt
return f, nil
}
func (f *FiFo) Write(data string) error {
if f.max > 0 && f.GetSize() >= f.max {
return errors.New("fifo max " + strconv.Itoa(f.max))
}
_, err := f.insertJobStmt.Exec(data)
if err != nil {
loggo.Info("Write fail %v", err)
return err
}
//loggo.Info("Write ok %s", data)
return nil
}
func (f *FiFo) Read(n int) ([]string, error) {
ids, datas, err := f.read(n)
if err != nil {
return nil, err
}
for _, id := range ids {
_, err = f.deleteJobStmt.Exec(id)
if err != nil {
loggo.Info("Read delete fail %v", err)
return nil, err
}
}
//loggo.Info("Read ok %d %s", id, data)
return datas, nil
}
func (f *FiFo) read(n int) ([]int, []string, error) {
var ids []int
var datas []string
rows, err := f.getJobStmt.Query(n)
if err != nil {
//loggo.Info("Read Scan fail %v", err)
return nil, nil, err
}
defer rows.Close()
for rows.Next() {
var id int
var data string
err := rows.Scan(&id, &data)
if err != nil {
loggo.Info("Scan sqlite3 fail %v", err)
return nil, nil, err
}
ids = append(ids, id)
datas = append(datas, data)
}
return ids, datas, nil
}
func (f *FiFo) GetSize() int {
var ret int
err := f.sizeDoneStmt.QueryRow().Scan(&ret)
if err != nil {
loggo.Info("GetSize fail %v", err)
return 0
}
return ret
}