/
client.go
121 lines (107 loc) · 2.4 KB
/
client.go
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package radish
import (
"bufio"
"encoding/json"
"errors"
"fmt"
"net"
"strings"
"time"
)
type RadishClient struct {
conn net.Conn
reader *bufio.Reader
}
var _ Client = &RadishClient{}
func Open(addr string) (*RadishClient, error) {
c, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
return &RadishClient{c, bufio.NewReader(c)}, nil
}
func (r *RadishClient) Close() error {
return r.conn.Close()
}
func (r *RadishClient) Get(key string) (interface{}, error) {
if hasSpaces(key) {
return nil, InvalidKey
}
fmt.Fprintf(r.conn, "GET %s\n", key)
return r.readAnswer()
}
func (r *RadishClient) Set(key string, value interface{}, ttl time.Duration) error {
if hasSpaces(key) {
return InvalidKey
}
data, err := json.Marshal(value)
if err != nil {
return err
}
fmt.Fprintf(r.conn, "SET %s %d %s\n", key, ttl, string(data))
_, err = r.readAnswer()
return err
}
func (r *RadishClient) Remove(key string) error {
if hasSpaces(key) {
return InvalidKey
}
fmt.Fprintf(r.conn, "REMOVE %s\n", key)
_, err := r.readAnswer()
return err
}
func (r *RadishClient) Keys() ([]string, error) {
fmt.Fprintf(r.conn, "KEYS\n")
v, err := r.readAnswer()
if err != nil {
return nil, err
}
result := []string{}
for _, val := range v.([]interface{}) {
result = append(result, val.(string))
}
return result, nil
}
func (r *RadishClient) GetIndex(key string, index int) (interface{}, error) {
if hasSpaces(key) {
return nil, InvalidKey
}
fmt.Fprintf(r.conn, "GETINDEX %s %d\n", key, index)
return r.readAnswer()
}
func (r *RadishClient) GetDict(dictName string, key string) (interface{}, error) {
if hasSpaces(dictName) || hasSpaces(key) {
return nil, InvalidKey
}
fmt.Fprintf(r.conn, "GETDICT %s %s\n", dictName, key)
return r.readAnswer()
}
func (r *RadishClient) readAnswer() (interface{}, error) {
result, err := r.reader.ReadString('\n')
if err != nil {
return nil, err
}
result = strings.TrimSpace(result)
s := strings.SplitN(result, " ", 2)
switch s[0] {
case "OK":
if len(s) <= 1 {
return nil, nil
}
var v interface{}
if err := json.Unmarshal([]byte(s[1]), &v); err != nil {
return nil, err
}
return v, nil
case "ERROR":
if err, ok := errorsmap[s[1]]; ok {
return nil, err
}
return nil, errors.New(s[1])
}
panic("ups. invalid server")
}
// TODO implement escaping in proto
func hasSpaces(s string) bool {
return strings.IndexByte(s, ' ') >= 0
}