mirror of https://github.com/go-redis/redis.git
145 lines
2.8 KiB
Go
145 lines
2.8 KiB
Go
package redis
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"net"
|
|
"strings"
|
|
|
|
"github.com/go-redis/redis/v8/internal/pool"
|
|
"github.com/go-redis/redis/v8/internal/proto"
|
|
)
|
|
|
|
// ErrClosed performs any operation on the closed client will return this error.
|
|
var ErrClosed = pool.ErrClosed
|
|
|
|
type Error interface {
|
|
error
|
|
|
|
// RedisError is a no-op function but
|
|
// serves to distinguish types that are Redis
|
|
// errors from ordinary errors: a type is a
|
|
// Redis error if it has a RedisError method.
|
|
RedisError()
|
|
}
|
|
|
|
var _ Error = proto.RedisError("")
|
|
|
|
func shouldRetry(err error, retryTimeout bool) bool {
|
|
switch err {
|
|
case io.EOF, io.ErrUnexpectedEOF:
|
|
return true
|
|
case nil, context.Canceled, context.DeadlineExceeded:
|
|
return false
|
|
}
|
|
|
|
if v, ok := err.(timeoutError); ok {
|
|
if v.Timeout() {
|
|
return retryTimeout
|
|
}
|
|
return true
|
|
}
|
|
|
|
s := err.Error()
|
|
if s == "ERR max number of clients reached" {
|
|
return true
|
|
}
|
|
if strings.HasPrefix(s, "LOADING ") {
|
|
return true
|
|
}
|
|
if strings.HasPrefix(s, "READONLY ") {
|
|
return true
|
|
}
|
|
if strings.HasPrefix(s, "CLUSTERDOWN ") {
|
|
return true
|
|
}
|
|
if strings.HasPrefix(s, "TRYAGAIN ") {
|
|
return true
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func isRedisError(err error) bool {
|
|
_, ok := err.(proto.RedisError)
|
|
return ok
|
|
}
|
|
|
|
func isBadConn(err error, allowTimeout bool, addr string) bool {
|
|
switch err {
|
|
case nil:
|
|
return false
|
|
case context.Canceled, context.DeadlineExceeded:
|
|
return true
|
|
}
|
|
|
|
if isRedisError(err) {
|
|
switch {
|
|
case isReadOnlyError(err):
|
|
// Close connections in read only state in case domain addr is used
|
|
// and domain resolves to a different Redis Server. See #790.
|
|
return true
|
|
case isMovedSameConnAddr(err, addr):
|
|
// Close connections when we are asked to move to the same addr
|
|
// of the connection. Force a DNS resolution when all connections
|
|
// of the pool are recycled
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
if allowTimeout {
|
|
if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
|
|
return !netErr.Temporary()
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func isMovedError(err error) (moved bool, ask bool, addr string) {
|
|
if !isRedisError(err) {
|
|
return
|
|
}
|
|
|
|
s := err.Error()
|
|
switch {
|
|
case strings.HasPrefix(s, "MOVED "):
|
|
moved = true
|
|
case strings.HasPrefix(s, "ASK "):
|
|
ask = true
|
|
default:
|
|
return
|
|
}
|
|
|
|
ind := strings.LastIndex(s, " ")
|
|
if ind == -1 {
|
|
return false, false, ""
|
|
}
|
|
addr = s[ind+1:]
|
|
return
|
|
}
|
|
|
|
func isLoadingError(err error) bool {
|
|
return strings.HasPrefix(err.Error(), "LOADING ")
|
|
}
|
|
|
|
func isReadOnlyError(err error) bool {
|
|
return strings.HasPrefix(err.Error(), "READONLY ")
|
|
}
|
|
|
|
func isMovedSameConnAddr(err error, addr string) bool {
|
|
redisError := err.Error()
|
|
if !strings.HasPrefix(redisError, "MOVED ") {
|
|
return false
|
|
}
|
|
return strings.HasSuffix(redisError, addr)
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
type timeoutError interface {
|
|
Timeout() bool
|
|
}
|