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|
package commands
import (
"errors"
"net"
"redisClone/pkg/core"
"redisClone/pkg/pubsub"
)
var dbInstance core.RedisDB
func SetDB(db core.RedisDB) {
dbInstance = db
}
func SingleKey(args []string) []string {
return []string{args[1]}
}
func AllSubsequentKeys(args []string) []string {
return args[1:]
}
func NoKeys(args []string) []string {
return nil
}
func RenameKeys(args []string) []string {
return []string{args[1], args[2]}
}
type BaseCommand struct{
MinArgs int
ExtractKeys func(args []string)[]string
Execute func(args []string, getShard func(k string) *core.Shard) interface{}
}
func DispatchBaseCommand(db core.RedisDB ,cmd BaseCommand, args []string) interface{} {
if len(args) < cmd.MinArgs {
return errors.New("wrong number of arguments")
}
keys := cmd.ExtractKeys(args)
db.Lock(keys)
defer db.Unlock(keys)
return cmd.Execute(args, db.GetShard)
}
type PubSubCommand struct{
MinArgs int
Execute func(hub *pubsub.Hub, conn net.Conn, args []string) interface{}
}
func DispatchPubSub(conn net.Conn, h *pubsub.Hub, cmd PubSubCommand, args []string) {
if len(args) < cmd.MinArgs {
conn.Write(core.SerializeRESP(errors.New("ERR wrong number of arguments")))
return
}
if res := cmd.Execute(h, conn, args); res != nil {
conn.Write(core.SerializeRESP(res))
}
}
var BaseRegistry = map[string]BaseCommand{
"GET": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Get,
},
"SET": {
MinArgs: 3,
ExtractKeys: SingleKey,
Execute: Set,
},
"DEL": {
MinArgs: 2,
ExtractKeys: AllSubsequentKeys,
Execute: Del,
},
"EXISTS": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Exists,
},
"INCR": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Incr,
},
"DECR": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Decr,
},
"RENAME": {
MinArgs: 3,
ExtractKeys: RenameKeys,
Execute: Rename,
},
"RPUSH": {
MinArgs: 3,
ExtractKeys: SingleKey,
Execute: Rpush,
},
"LPUSH": {
MinArgs: 3,
ExtractKeys: SingleKey,
Execute: Lpush,
},
"RPOP": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Rpop,
},
"LPOP": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Lpop,
},
"LRANGE": {
MinArgs: 4,
ExtractKeys: SingleKey,
Execute: Lrange,
},
"FLUSHALL": {
MinArgs: 1,
ExtractKeys: NoKeys,
Execute: Flushall,
},
"EXPIRE": {
MinArgs: 3,
ExtractKeys: SingleKey,
Execute: Expire,
},
"HSET": {
MinArgs: 4,
ExtractKeys: SingleKey,
Execute: Hset,
},
"HGET": {
MinArgs: 3,
ExtractKeys: SingleKey,
Execute: Hget,
},
"HGETALL": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Hgetall,
},
"HKEYS": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Hkeys,
},
"HVALUES": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Hvalues,
},
"TYPE": {
MinArgs: 2,
ExtractKeys: SingleKey,
Execute: Type,
},
"DBSIZE": {
MinArgs: 1,
ExtractKeys: NoKeys,
Execute: Dbsize,
},
"KEYS": {
MinArgs: 2,
ExtractKeys: NoKeys,
Execute: Keys,
},
"LREM": {
MinArgs: 4,
ExtractKeys: SingleKey,
Execute: Lrem,
},
"PING": {
MinArgs: 1,
ExtractKeys: NoKeys,
Execute: Ping,
},
}
var PubSubRegistry = map[string]PubSubCommand{
"SUBSCRIBE": {MinArgs: 2, Execute: Subscribe},
"UNSUBSCRIBE": {MinArgs: 1, Execute: Unsubscribe},
"PUBLISH": {MinArgs: 3, Execute: Publish},
}
|
