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main.go
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main.go
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package main
import (
"bufio"
"database/sql"
"flag"
"fmt"
"os"
"strings"
_ "github.com/mattn/go-sqlite3"
)
var modules = []module{
&domains{},
}
func main() {
flag.Parse()
sc := bufio.NewScanner(os.Stdin)
db, err := sql.Open("sqlite3", "./bbdb.db")
if err != nil {
fmt.Fprintf(os.Stderr, "failed to open db: %s\n", err)
return
}
if err = db.Ping(); err != nil {
fmt.Fprintf(os.Stderr, "failed to ping db: %s\n", err)
return
}
// initialise db file
if flag.Arg(0) == "init" {
err := initModules(db)
if err != nil {
fmt.Fprintf(os.Stderr, "init error: %s\n", err)
}
return
}
// TODO: accept single command as args / prefix to all stdin lines
for sc.Scan() {
line := sc.Text()
op, err := tokenize(line)
if err != nil {
fmt.Fprintf(os.Stderr, "parse error: %s\n", err)
continue
}
mod, err := getModule(op, db)
if err != nil {
fmt.Fprintf(os.Stderr, "module error: %s\n", err)
continue
}
switch op.action {
case "add":
err = mod.Add(op.arg)
if err != nil {
fmt.Fprintf(os.Stderr, "add error: %s\n", err)
continue
}
case "all":
vals, err := mod.All()
if err != nil {
fmt.Fprintf(os.Stderr, "all error: %s\n", err)
continue
}
for _, v := range vals {
fmt.Println(v)
}
case "delete":
err = mod.Delete(op.arg)
if err != nil {
fmt.Fprintf(os.Stderr, "add error: %s\n", err)
}
}
}
}
type module interface {
// meta
names() []string
setDB(*sql.DB)
initModule() error
// change
Add(string) error
Delete(string) error
// read
All() ([]string, error)
}
func getModule(o op, db *sql.DB) (module, error) {
for _, m := range modules {
for _, name := range m.names() {
if name == o.typ {
m.setDB(db)
return m, nil
}
}
}
return nil, fmt.Errorf("no such module: %s", o.typ)
}
type op struct {
action string
typ string
arg string
}
func tokenize(in string) (op, error) {
t := strings.Fields(in)
if len(t) < 2 {
return op{}, fmt.Errorf("not enough tokens in '%s'", in)
}
arg := ""
if len(t) > 2 {
arg = t[2]
}
return op{
action: strings.ToLower(t[0]),
typ: strings.ToLower(t[1]),
arg: arg,
}, nil
}
func initModules(db *sql.DB) error {
for _, m := range modules {
m.setDB(db)
err := m.initModule()
if err != nil {
return err
}
}
return nil
}