protocol

var (
	//Used when we are trying to parse the size of a bulk or multibulk message, and do not receive a valid number
	ERROR_INVALID_INT            = &RecoverableError{"Did not receive valid int value"}
	ERROR_INVALID_COMMAND_FORMAT = &RecoverableError{"Bad command format provided"}
	//Used when we expect a redis bulk-format payload, and do not receive one
	ERROR_BAD_BULK_FORMAT = &RecoverableError{"Bad bulk format supplied"}
	ERROR_COMMAND_PARSE   = &RecoverableError{"Command parse error"}

	//Error for unsupported (deemed unsafe for multiplexing) commands
	ERR_COMMAND_UNSUPPORTED = &RecoverableError{"This command is not supported"}

	//Error for when we receive bad arguments (for multiplexing) accompanying a command
	ERR_BAD_ARGUMENTS = &RecoverableError{"Bad arguments for command"}

	//Commands declared once for convenience
	DEL_COMMAND         = []byte("del")
	SUBSCRIBE_COMMAND   = []byte("subscribe")
	UNSUBSCRIBE_COMMAND = []byte("unsubscribe")
	PING_COMMAND        = []byte("ping")
	INFO_COMMAND        = []byte("info")
	SHORT_PING_COMMAND  = []byte("PING")
	SELECT_COMMAND      = []byte("select")
	QUIT_COMMAND        = []byte("quit")

	//Responses declared once for convenience
	OK_RESPONSE   = []byte("+OK")
	PONG_RESPONSE = []byte("+PONG")
	ERR_RESPONSE  = []byte("$-1")

	//Redis expects \r\n newlines.  Using this means we can stop remembering that
	REDIS_NEWLINE = []byte("\r\n")

	//These functions should not be executed through a proxy.
	//If you know what you're doing, you are welcome to execute them directly on your server
	UNSAFE_FUNCTIONS = map[string]bool{
		"auth":         true,
		"bgrewriteaof": true,
		"bgsave":       true,
		"client":       true,
		"config":       true,
		"dbsize":       true,
		"discard":      true,
		"debug":        true,
		"exec":         true,
		"lastsave":     true,
		"move":         true,
		"monitor":      true,
		"migrate":      true,
		"multi":        true,
		"object":       true,
		"punsubscribe": true,
		"psubscribe":   true,
		"pubsub":       true,
		"randomkey":    true,
		"save":         true,
		"shutdown":     true,
		"slaveof":      true,
		"slowlog":      true,
		"subscribe":    true,
		"sync":         true,
		"time":         true,
		"unsubscribe":  true,
		"unwatch":      true,
		"watch":        true,
	}

	//These functions will only work if multiplexing is disabled.
	//It would be rather worthless to watch on one server, multi on another, and increment on a third
	SINGLE_DB_FUNCTIONS = map[string]bool{
		"bitop":       true,
		"brpoplpush":  true,
		"eval":        true,
		"keys":        true,
		"flushall":    true,
		"flushdb":     true,
		"mget":        true,
		"mset":        true,
		"msetnx":      true,
		"rename":      true,
		"renamenx":    true,
		"rpoplpush":   true,
		"script":      true,
		"sdiff":       true,
		"sdiffstore":  true,
		"sinter":      true,
		"sinterstore": true,
		"smove":       true,
		"sunion":      true,
		"sunionstore": true,
		"zinterstore": true,
		"zunionstore": true,
	}
)

var NIL_STRING []byte = nil