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get.go
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get.go
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package redis
import (
"errors"
"fmt"
"net/url"
"strconv"
"strings"
"github.com/go-redis/redis/v7"
"github.com/koron/nvgd/internal/httperror"
"github.com/koron/nvgd/resource"
)
type getHandler func(*redis.Client, string, []string) (*resource.Resource, error)
var getHandlers = map[string]getHandler{
"string": getString,
"list": getList,
"set": getSet,
"zset": getZset,
"hash": getHash,
"none": getNone,
}
func get(c *redis.Client, args []string) (*resource.Resource, error) {
if len(args) < 1 {
return nil, errors.New("require a key at least")
}
key, err := url.PathUnescape(args[0])
if err != nil {
return nil, fmt.Errorf("key contains invalid sequence: %s", err)
}
typ, err := c.Type(key).Result()
if err != nil {
return nil, fmt.Errorf("failed to TYPE: %s", err)
}
h, ok := getHandlers[strings.ToLower(typ)]
if !ok {
return nil, fmt.Errorf("unsupported redis value type: %s", typ)
}
return h(c, key, args[1:])
}
func getString(c *redis.Client, k string, args []string) (*resource.Resource, error) {
// GET
if len(args) == 0 {
s, err := c.Get(k).Result()
if err != nil {
return nil, err
}
return resource.NewString(s), nil
}
// GETBIT
if len(args) == 1 {
off, err := strconv.ParseInt(args[0], 10, 64)
if err != nil {
return nil, err
}
n, err := c.GetBit(k, off).Result()
if err != nil {
return nil, err
}
return resource.NewString(strconv.FormatInt(n, 10)), nil
}
// GETRANGE
if len(args) == 2 {
start, err := strconv.ParseInt(args[0], 10, 64)
if err != nil {
return nil, err
}
end, err := strconv.ParseInt(args[1], 10, 64)
if err != nil {
return nil, err
}
s, err := c.GetRange(k, start, end).Result()
if err != nil {
return nil, err
}
return resource.NewString(s), nil
}
return nil, errors.New("too many arguments")
}
func getList(c *redis.Client, k string, args []string) (*resource.Resource, error) {
// LLEN
if len(args) == 0 {
n, err := c.LLen(k).Result()
if err != nil {
return nil, err
}
return resource.NewString(strconv.FormatInt(n, 10)), nil
}
// LINDEX
if len(args) == 1 {
index, err := strconv.ParseInt(args[0], 10, 64)
if err != nil {
return nil, err
}
s, err := c.LIndex(k, index).Result()
if err != nil {
return nil, err
}
return resource.NewString(s), nil
}
// LRANGE
if len(args) == 2 {
start, err := strconv.ParseInt(args[0], 10, 64)
if err != nil {
return nil, err
}
stop, err := strconv.ParseInt(args[1], 10, 64)
if err != nil {
return nil, err
}
ss, err := c.LRange(k, start, stop).Result()
if err != nil {
return nil, err
}
return resource.NewString(strings.Join(ss, "\n")), nil
}
return nil, errors.New("too many arguments")
}
func getSet(c *redis.Client, k string, args []string) (*resource.Resource, error) {
// SCARD
if len(args) == 0 {
n, err := c.SCard(k).Result()
if err != nil {
return nil, err
}
return resource.NewString(strconv.FormatInt(n, 10)), nil
}
// SISMEMBER
if len(args) == 1 {
member := args[0]
b, err := c.SIsMember(k, member).Result()
if err != nil {
return nil, err
}
return resource.NewString(strconv.FormatBool(b)), nil
}
return nil, errors.New("too many arguments")
}
func getZset(c *redis.Client, k string, args []string) (*resource.Resource, error) {
// ZCARD
if len(args) == 0 {
n, err := c.ZCard(k).Result()
if err != nil {
return nil, err
}
return resource.NewString(strconv.FormatInt(n, 10)), nil
}
// ZRANK
if len(args) == 1 {
member := args[0]
n, err := c.ZRank(k, member).Result()
if err != nil {
return nil, err
}
return resource.NewString(strconv.FormatInt(n, 10)), nil
}
// ZRANGE
if len(args) == 2 {
start, err := strconv.ParseInt(args[0], 10, 64)
if err != nil {
return nil, err
}
stop, err := strconv.ParseInt(args[1], 10, 64)
if err != nil {
return nil, err
}
ss, err := c.ZRange(k, start, stop).Result()
if err != nil {
return nil, err
}
return resource.NewString(strings.Join(ss, "\n")), nil
}
return nil, errors.New("too many arguments")
}
func getHash(c *redis.Client, k string, args []string) (*resource.Resource, error) {
// HLEN
if len(args) == 0 {
n, err := c.HLen(k).Result()
if err != nil {
return nil, err
}
return resource.NewString(strconv.FormatInt(n, 10)), nil
}
// HGET
if len(args) == 1 {
member := args[0]
s, err := c.HGet(k, member).Result()
if err != nil {
return nil, err
}
return resource.NewString(s), nil
}
return nil, errors.New("too many arguments")
}
func getNone(c *redis.Client, k string, args []string) (*resource.Resource, error) {
return nil, httperror.Newf(404, "not found a key: %s", k)
}