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redis.go
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redis.go
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package redis // import "gopkg.in/redis.v3"
import (
"fmt"
"log"
"net"
"time"
)
type baseClient struct {
connPool pool
opt *options
}
func (c *baseClient) String() string {
return fmt.Sprintf("Redis<%s db:%d>", c.opt.Addr, c.opt.DB)
}
func (c *baseClient) conn() (*conn, error) {
return c.connPool.Get()
}
func (c *baseClient) putConn(cn *conn, ei error) {
var err error
if cn.rd.Buffered() > 0 {
err = c.connPool.Remove(cn)
} else if ei == nil {
err = c.connPool.Put(cn)
} else if _, ok := ei.(redisError); ok {
err = c.connPool.Put(cn)
} else {
err = c.connPool.Remove(cn)
}
if err != nil {
log.Printf("redis: putConn failed: %s", err)
}
}
func (c *baseClient) process(cmd Cmder) {
for i := 0; i <= c.opt.MaxRetries; i++ {
if i > 0 {
cmd.reset()
}
cn, err := c.conn()
if err != nil {
cmd.setErr(err)
return
}
if timeout := cmd.writeTimeout(); timeout != nil {
cn.WriteTimeout = *timeout
} else {
cn.WriteTimeout = c.opt.WriteTimeout
}
if timeout := cmd.readTimeout(); timeout != nil {
cn.ReadTimeout = *timeout
} else {
cn.ReadTimeout = c.opt.ReadTimeout
}
if err := cn.writeCmds(cmd); err != nil {
c.putConn(cn, err)
cmd.setErr(err)
if shouldRetry(err) {
continue
}
return
}
err = cmd.parseReply(cn.rd)
c.putConn(cn, err)
if shouldRetry(err) {
continue
}
return
}
}
// Close closes the client, releasing any open resources.
func (c *baseClient) Close() error {
return c.connPool.Close()
}
//------------------------------------------------------------------------------
type Options struct {
// The network type, either "tcp" or "unix".
// Default: "tcp"
Network string
// The network address.
Addr string
// Dialer creates new network connection and has priority over
// Network and Addr options.
Dialer func() (net.Conn, error)
// An optional password. Must match the password specified in the
// `requirepass` server configuration option.
Password string
// Select a database.
// Default: 0
DB int64
// Sets the deadline for establishing new connections. If reached,
// deal attepts will fail with a timeout.
DialTimeout time.Duration
// Sets the deadline for socket reads. If reached, commands will
// fail with a timeout instead of blocking.
ReadTimeout time.Duration
// Sets the deadline for socket writes. If reached, commands will
// fail with a timeout instead of blocking.
WriteTimeout time.Duration
// The maximum number of socket connections.
// Default: 10
PoolSize int
// PoolTimeout specifies amount of time client waits for a free
// connection in the pool. Default timeout is 1s.
PoolTimeout time.Duration
// Evict connections from the pool after they have been idle for longer
// than specified in this option.
// Default: 0 = no eviction
IdleTimeout time.Duration
// MaxRetries specifies maximum number of times client will retry
// failed command. Default is to not retry failed command.
MaxRetries int
}
func (opt *Options) getDialer() func() (net.Conn, error) {
if opt.Dialer == nil {
return func() (net.Conn, error) {
return net.DialTimeout(opt.getNetwork(), opt.Addr, opt.getDialTimeout())
}
}
return opt.Dialer
}
func (opt *Options) getNetwork() string {
if opt.Network == "" {
return "tcp"
}
return opt.Network
}
func (opt *Options) getPoolSize() int {
if opt.PoolSize == 0 {
return 10
}
return opt.PoolSize
}
func (opt *Options) getDialTimeout() time.Duration {
if opt.DialTimeout == 0 {
return 5 * time.Second
}
return opt.DialTimeout
}
func (opt *Options) getPoolTimeout() time.Duration {
if opt.PoolTimeout == 0 {
return 1 * time.Second
}
return opt.PoolTimeout
}
func (opt *Options) options() *options {
return &options{
Addr: opt.Addr,
Dialer: opt.getDialer(),
PoolSize: opt.getPoolSize(),
PoolTimeout: opt.getPoolTimeout(),
IdleTimeout: opt.IdleTimeout,
DB: opt.DB,
Password: opt.Password,
DialTimeout: opt.getDialTimeout(),
ReadTimeout: opt.ReadTimeout,
WriteTimeout: opt.WriteTimeout,
MaxRetries: opt.MaxRetries,
}
}
type options struct {
Addr string
Dialer func() (net.Conn, error)
PoolSize int
PoolTimeout time.Duration
IdleTimeout time.Duration
Password string
DB int64
DialTimeout time.Duration
ReadTimeout time.Duration
WriteTimeout time.Duration
MaxRetries int
}
func (opt *options) connPoolOptions() *connPoolOptions {
return &connPoolOptions{
Dialer: newConnDialer(opt),
PoolSize: opt.PoolSize,
PoolTimeout: opt.PoolTimeout,
IdleTimeout: opt.IdleTimeout,
}
}
//------------------------------------------------------------------------------
type Client struct {
*baseClient
commandable
}
func newClient(opt *options, pool pool) *Client {
base := &baseClient{opt: opt, connPool: pool}
return &Client{
baseClient: base,
commandable: commandable{process: base.process},
}
}
func NewClient(clOpt *Options) *Client {
opt := clOpt.options()
pool := newConnPool(opt.connPoolOptions())
return newClient(opt, pool)
}