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674 lines
15 KiB
Go
674 lines
15 KiB
Go
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// Copyright 2012 Gary Burd
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//
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// Licensed under the Apache License, Version 2.0 (the "License"): you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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package redis
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import (
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"bufio"
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"bytes"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"net"
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"net/url"
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"regexp"
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"strconv"
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"sync"
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"time"
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)
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var (
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_ ConnWithTimeout = (*conn)(nil)
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)
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// conn is the low-level implementation of Conn
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type conn struct {
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// Shared
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mu sync.Mutex
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pending int
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err error
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conn net.Conn
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// Read
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readTimeout time.Duration
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br *bufio.Reader
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// Write
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writeTimeout time.Duration
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bw *bufio.Writer
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// Scratch space for formatting argument length.
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// '*' or '$', length, "\r\n"
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lenScratch [32]byte
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// Scratch space for formatting integers and floats.
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numScratch [40]byte
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}
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// DialTimeout acts like Dial but takes timeouts for establishing the
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// connection to the server, writing a command and reading a reply.
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//
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// Deprecated: Use Dial with options instead.
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func DialTimeout(network, address string, connectTimeout, readTimeout, writeTimeout time.Duration) (Conn, error) {
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return Dial(network, address,
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DialConnectTimeout(connectTimeout),
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DialReadTimeout(readTimeout),
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DialWriteTimeout(writeTimeout))
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}
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// DialOption specifies an option for dialing a Redis server.
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type DialOption struct {
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f func(*dialOptions)
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}
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type dialOptions struct {
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readTimeout time.Duration
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writeTimeout time.Duration
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dialer *net.Dialer
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dial func(network, addr string) (net.Conn, error)
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db int
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password string
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useTLS bool
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skipVerify bool
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tlsConfig *tls.Config
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}
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// DialReadTimeout specifies the timeout for reading a single command reply.
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func DialReadTimeout(d time.Duration) DialOption {
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return DialOption{func(do *dialOptions) {
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do.readTimeout = d
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}}
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}
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// DialWriteTimeout specifies the timeout for writing a single command.
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func DialWriteTimeout(d time.Duration) DialOption {
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return DialOption{func(do *dialOptions) {
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do.writeTimeout = d
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}}
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}
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// DialConnectTimeout specifies the timeout for connecting to the Redis server when
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// no DialNetDial option is specified.
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func DialConnectTimeout(d time.Duration) DialOption {
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return DialOption{func(do *dialOptions) {
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do.dialer.Timeout = d
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}}
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}
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// DialKeepAlive specifies the keep-alive period for TCP connections to the Redis server
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// when no DialNetDial option is specified.
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// If zero, keep-alives are not enabled. If no DialKeepAlive option is specified then
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// the default of 5 minutes is used to ensure that half-closed TCP sessions are detected.
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func DialKeepAlive(d time.Duration) DialOption {
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return DialOption{func(do *dialOptions) {
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do.dialer.KeepAlive = d
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}}
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}
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// DialNetDial specifies a custom dial function for creating TCP
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// connections, otherwise a net.Dialer customized via the other options is used.
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// DialNetDial overrides DialConnectTimeout and DialKeepAlive.
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func DialNetDial(dial func(network, addr string) (net.Conn, error)) DialOption {
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return DialOption{func(do *dialOptions) {
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do.dial = dial
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}}
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}
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// DialDatabase specifies the database to select when dialing a connection.
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func DialDatabase(db int) DialOption {
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return DialOption{func(do *dialOptions) {
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do.db = db
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}}
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}
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// DialPassword specifies the password to use when connecting to
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// the Redis server.
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func DialPassword(password string) DialOption {
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return DialOption{func(do *dialOptions) {
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do.password = password
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}}
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}
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// DialTLSConfig specifies the config to use when a TLS connection is dialed.
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// Has no effect when not dialing a TLS connection.
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func DialTLSConfig(c *tls.Config) DialOption {
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return DialOption{func(do *dialOptions) {
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do.tlsConfig = c
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}}
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}
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// DialTLSSkipVerify disables server name verification when connecting over
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// TLS. Has no effect when not dialing a TLS connection.
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func DialTLSSkipVerify(skip bool) DialOption {
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return DialOption{func(do *dialOptions) {
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do.skipVerify = skip
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}}
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}
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// DialUseTLS specifies whether TLS should be used when connecting to the
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// server. This option is ignore by DialURL.
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func DialUseTLS(useTLS bool) DialOption {
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return DialOption{func(do *dialOptions) {
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do.useTLS = useTLS
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}}
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}
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// Dial connects to the Redis server at the given network and
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// address using the specified options.
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func Dial(network, address string, options ...DialOption) (Conn, error) {
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do := dialOptions{
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dialer: &net.Dialer{
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KeepAlive: time.Minute * 5,
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},
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}
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for _, option := range options {
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option.f(&do)
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}
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if do.dial == nil {
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do.dial = do.dialer.Dial
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}
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netConn, err := do.dial(network, address)
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if err != nil {
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return nil, err
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}
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if do.useTLS {
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var tlsConfig *tls.Config
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if do.tlsConfig == nil {
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tlsConfig = &tls.Config{InsecureSkipVerify: do.skipVerify}
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} else {
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tlsConfig = cloneTLSConfig(do.tlsConfig)
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}
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if tlsConfig.ServerName == "" {
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host, _, err := net.SplitHostPort(address)
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if err != nil {
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netConn.Close()
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return nil, err
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}
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tlsConfig.ServerName = host
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}
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tlsConn := tls.Client(netConn, tlsConfig)
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if err := tlsConn.Handshake(); err != nil {
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netConn.Close()
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return nil, err
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}
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netConn = tlsConn
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}
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c := &conn{
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conn: netConn,
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bw: bufio.NewWriter(netConn),
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br: bufio.NewReader(netConn),
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readTimeout: do.readTimeout,
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writeTimeout: do.writeTimeout,
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}
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if do.password != "" {
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if _, err := c.Do("AUTH", do.password); err != nil {
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netConn.Close()
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return nil, err
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}
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}
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if do.db != 0 {
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if _, err := c.Do("SELECT", do.db); err != nil {
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netConn.Close()
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return nil, err
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}
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}
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return c, nil
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}
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var pathDBRegexp = regexp.MustCompile(`/(\d*)\z`)
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// DialURL connects to a Redis server at the given URL using the Redis
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// URI scheme. URLs should follow the draft IANA specification for the
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// scheme (https://www.iana.org/assignments/uri-schemes/prov/redis).
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func DialURL(rawurl string, options ...DialOption) (Conn, error) {
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u, err := url.Parse(rawurl)
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if err != nil {
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return nil, err
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}
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if u.Scheme != "redis" && u.Scheme != "rediss" {
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return nil, fmt.Errorf("invalid redis URL scheme: %s", u.Scheme)
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}
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// As per the IANA draft spec, the host defaults to localhost and
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// the port defaults to 6379.
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host, port, err := net.SplitHostPort(u.Host)
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if err != nil {
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// assume port is missing
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host = u.Host
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port = "6379"
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}
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if host == "" {
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host = "localhost"
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}
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address := net.JoinHostPort(host, port)
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if u.User != nil {
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password, isSet := u.User.Password()
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if isSet {
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options = append(options, DialPassword(password))
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}
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}
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match := pathDBRegexp.FindStringSubmatch(u.Path)
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if len(match) == 2 {
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db := 0
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if len(match[1]) > 0 {
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db, err = strconv.Atoi(match[1])
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if err != nil {
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return nil, fmt.Errorf("invalid database: %s", u.Path[1:])
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}
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}
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if db != 0 {
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options = append(options, DialDatabase(db))
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}
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} else if u.Path != "" {
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return nil, fmt.Errorf("invalid database: %s", u.Path[1:])
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}
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options = append(options, DialUseTLS(u.Scheme == "rediss"))
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return Dial("tcp", address, options...)
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}
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// NewConn returns a new Redigo connection for the given net connection.
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func NewConn(netConn net.Conn, readTimeout, writeTimeout time.Duration) Conn {
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return &conn{
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conn: netConn,
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bw: bufio.NewWriter(netConn),
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br: bufio.NewReader(netConn),
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readTimeout: readTimeout,
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writeTimeout: writeTimeout,
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}
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}
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func (c *conn) Close() error {
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c.mu.Lock()
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err := c.err
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if c.err == nil {
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c.err = errors.New("redigo: closed")
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err = c.conn.Close()
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}
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c.mu.Unlock()
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return err
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}
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func (c *conn) fatal(err error) error {
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c.mu.Lock()
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if c.err == nil {
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c.err = err
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// Close connection to force errors on subsequent calls and to unblock
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// other reader or writer.
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c.conn.Close()
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}
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c.mu.Unlock()
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return err
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}
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func (c *conn) Err() error {
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c.mu.Lock()
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err := c.err
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c.mu.Unlock()
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return err
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}
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func (c *conn) writeLen(prefix byte, n int) error {
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c.lenScratch[len(c.lenScratch)-1] = '\n'
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c.lenScratch[len(c.lenScratch)-2] = '\r'
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i := len(c.lenScratch) - 3
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for {
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c.lenScratch[i] = byte('0' + n%10)
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i -= 1
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n = n / 10
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if n == 0 {
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break
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}
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}
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c.lenScratch[i] = prefix
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_, err := c.bw.Write(c.lenScratch[i:])
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return err
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}
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func (c *conn) writeString(s string) error {
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c.writeLen('$', len(s))
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c.bw.WriteString(s)
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_, err := c.bw.WriteString("\r\n")
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return err
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}
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func (c *conn) writeBytes(p []byte) error {
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c.writeLen('$', len(p))
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c.bw.Write(p)
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_, err := c.bw.WriteString("\r\n")
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return err
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}
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func (c *conn) writeInt64(n int64) error {
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return c.writeBytes(strconv.AppendInt(c.numScratch[:0], n, 10))
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}
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func (c *conn) writeFloat64(n float64) error {
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return c.writeBytes(strconv.AppendFloat(c.numScratch[:0], n, 'g', -1, 64))
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}
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func (c *conn) writeCommand(cmd string, args []interface{}) error {
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c.writeLen('*', 1+len(args))
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if err := c.writeString(cmd); err != nil {
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return err
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}
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for _, arg := range args {
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if err := c.writeArg(arg, true); err != nil {
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return err
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}
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}
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return nil
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}
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func (c *conn) writeArg(arg interface{}, argumentTypeOK bool) (err error) {
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switch arg := arg.(type) {
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case string:
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return c.writeString(arg)
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case []byte:
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return c.writeBytes(arg)
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case int:
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return c.writeInt64(int64(arg))
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case int64:
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return c.writeInt64(arg)
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case float64:
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return c.writeFloat64(arg)
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case bool:
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if arg {
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return c.writeString("1")
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} else {
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return c.writeString("0")
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}
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case nil:
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return c.writeString("")
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case Argument:
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if argumentTypeOK {
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return c.writeArg(arg.RedisArg(), false)
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}
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// See comment in default clause below.
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var buf bytes.Buffer
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fmt.Fprint(&buf, arg)
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return c.writeBytes(buf.Bytes())
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default:
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// This default clause is intended to handle builtin numeric types.
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// The function should return an error for other types, but this is not
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// done for compatibility with previous versions of the package.
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var buf bytes.Buffer
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fmt.Fprint(&buf, arg)
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return c.writeBytes(buf.Bytes())
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}
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}
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type protocolError string
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func (pe protocolError) Error() string {
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return fmt.Sprintf("redigo: %s (possible server error or unsupported concurrent read by application)", string(pe))
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}
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func (c *conn) readLine() ([]byte, error) {
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p, err := c.br.ReadSlice('\n')
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if err == bufio.ErrBufferFull {
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return nil, protocolError("long response line")
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}
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if err != nil {
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return nil, err
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}
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i := len(p) - 2
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if i < 0 || p[i] != '\r' {
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return nil, protocolError("bad response line terminator")
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}
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return p[:i], nil
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}
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// parseLen parses bulk string and array lengths.
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func parseLen(p []byte) (int, error) {
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if len(p) == 0 {
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return -1, protocolError("malformed length")
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}
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if p[0] == '-' && len(p) == 2 && p[1] == '1' {
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// handle $-1 and $-1 null replies.
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return -1, nil
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}
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var n int
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for _, b := range p {
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n *= 10
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if b < '0' || b > '9' {
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return -1, protocolError("illegal bytes in length")
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}
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||
|
n += int(b - '0')
|
||
|
}
|
||
|
|
||
|
return n, nil
|
||
|
}
|
||
|
|
||
|
// parseInt parses an integer reply.
|
||
|
func parseInt(p []byte) (interface{}, error) {
|
||
|
if len(p) == 0 {
|
||
|
return 0, protocolError("malformed integer")
|
||
|
}
|
||
|
|
||
|
var negate bool
|
||
|
if p[0] == '-' {
|
||
|
negate = true
|
||
|
p = p[1:]
|
||
|
if len(p) == 0 {
|
||
|
return 0, protocolError("malformed integer")
|
||
|
}
|
||
|
}
|
||
|
|
||
|
var n int64
|
||
|
for _, b := range p {
|
||
|
n *= 10
|
||
|
if b < '0' || b > '9' {
|
||
|
return 0, protocolError("illegal bytes in length")
|
||
|
}
|
||
|
n += int64(b - '0')
|
||
|
}
|
||
|
|
||
|
if negate {
|
||
|
n = -n
|
||
|
}
|
||
|
return n, nil
|
||
|
}
|
||
|
|
||
|
var (
|
||
|
okReply interface{} = "OK"
|
||
|
pongReply interface{} = "PONG"
|
||
|
)
|
||
|
|
||
|
func (c *conn) readReply() (interface{}, error) {
|
||
|
line, err := c.readLine()
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
if len(line) == 0 {
|
||
|
return nil, protocolError("short response line")
|
||
|
}
|
||
|
switch line[0] {
|
||
|
case '+':
|
||
|
switch {
|
||
|
case len(line) == 3 && line[1] == 'O' && line[2] == 'K':
|
||
|
// Avoid allocation for frequent "+OK" response.
|
||
|
return okReply, nil
|
||
|
case len(line) == 5 && line[1] == 'P' && line[2] == 'O' && line[3] == 'N' && line[4] == 'G':
|
||
|
// Avoid allocation in PING command benchmarks :)
|
||
|
return pongReply, nil
|
||
|
default:
|
||
|
return string(line[1:]), nil
|
||
|
}
|
||
|
case '-':
|
||
|
return Error(string(line[1:])), nil
|
||
|
case ':':
|
||
|
return parseInt(line[1:])
|
||
|
case '$':
|
||
|
n, err := parseLen(line[1:])
|
||
|
if n < 0 || err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
p := make([]byte, n)
|
||
|
_, err = io.ReadFull(c.br, p)
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
if line, err := c.readLine(); err != nil {
|
||
|
return nil, err
|
||
|
} else if len(line) != 0 {
|
||
|
return nil, protocolError("bad bulk string format")
|
||
|
}
|
||
|
return p, nil
|
||
|
case '*':
|
||
|
n, err := parseLen(line[1:])
|
||
|
if n < 0 || err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
r := make([]interface{}, n)
|
||
|
for i := range r {
|
||
|
r[i], err = c.readReply()
|
||
|
if err != nil {
|
||
|
return nil, err
|
||
|
}
|
||
|
}
|
||
|
return r, nil
|
||
|
}
|
||
|
return nil, protocolError("unexpected response line")
|
||
|
}
|
||
|
|
||
|
func (c *conn) Send(cmd string, args ...interface{}) error {
|
||
|
c.mu.Lock()
|
||
|
c.pending += 1
|
||
|
c.mu.Unlock()
|
||
|
if c.writeTimeout != 0 {
|
||
|
c.conn.SetWriteDeadline(time.Now().Add(c.writeTimeout))
|
||
|
}
|
||
|
if err := c.writeCommand(cmd, args); err != nil {
|
||
|
return c.fatal(err)
|
||
|
}
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func (c *conn) Flush() error {
|
||
|
if c.writeTimeout != 0 {
|
||
|
c.conn.SetWriteDeadline(time.Now().Add(c.writeTimeout))
|
||
|
}
|
||
|
if err := c.bw.Flush(); err != nil {
|
||
|
return c.fatal(err)
|
||
|
}
|
||
|
return nil
|
||
|
}
|
||
|
|
||
|
func (c *conn) Receive() (interface{}, error) {
|
||
|
return c.ReceiveWithTimeout(c.readTimeout)
|
||
|
}
|
||
|
|
||
|
func (c *conn) ReceiveWithTimeout(timeout time.Duration) (reply interface{}, err error) {
|
||
|
var deadline time.Time
|
||
|
if timeout != 0 {
|
||
|
deadline = time.Now().Add(timeout)
|
||
|
}
|
||
|
c.conn.SetReadDeadline(deadline)
|
||
|
|
||
|
if reply, err = c.readReply(); err != nil {
|
||
|
return nil, c.fatal(err)
|
||
|
}
|
||
|
// When using pub/sub, the number of receives can be greater than the
|
||
|
// number of sends. To enable normal use of the connection after
|
||
|
// unsubscribing from all channels, we do not decrement pending to a
|
||
|
// negative value.
|
||
|
//
|
||
|
// The pending field is decremented after the reply is read to handle the
|
||
|
// case where Receive is called before Send.
|
||
|
c.mu.Lock()
|
||
|
if c.pending > 0 {
|
||
|
c.pending -= 1
|
||
|
}
|
||
|
c.mu.Unlock()
|
||
|
if err, ok := reply.(Error); ok {
|
||
|
return nil, err
|
||
|
}
|
||
|
return
|
||
|
}
|
||
|
|
||
|
func (c *conn) Do(cmd string, args ...interface{}) (interface{}, error) {
|
||
|
return c.DoWithTimeout(c.readTimeout, cmd, args...)
|
||
|
}
|
||
|
|
||
|
func (c *conn) DoWithTimeout(readTimeout time.Duration, cmd string, args ...interface{}) (interface{}, error) {
|
||
|
c.mu.Lock()
|
||
|
pending := c.pending
|
||
|
c.pending = 0
|
||
|
c.mu.Unlock()
|
||
|
|
||
|
if cmd == "" && pending == 0 {
|
||
|
return nil, nil
|
||
|
}
|
||
|
|
||
|
if c.writeTimeout != 0 {
|
||
|
c.conn.SetWriteDeadline(time.Now().Add(c.writeTimeout))
|
||
|
}
|
||
|
|
||
|
if cmd != "" {
|
||
|
if err := c.writeCommand(cmd, args); err != nil {
|
||
|
return nil, c.fatal(err)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if err := c.bw.Flush(); err != nil {
|
||
|
return nil, c.fatal(err)
|
||
|
}
|
||
|
|
||
|
var deadline time.Time
|
||
|
if readTimeout != 0 {
|
||
|
deadline = time.Now().Add(readTimeout)
|
||
|
}
|
||
|
c.conn.SetReadDeadline(deadline)
|
||
|
|
||
|
if cmd == "" {
|
||
|
reply := make([]interface{}, pending)
|
||
|
for i := range reply {
|
||
|
r, e := c.readReply()
|
||
|
if e != nil {
|
||
|
return nil, c.fatal(e)
|
||
|
}
|
||
|
reply[i] = r
|
||
|
}
|
||
|
return reply, nil
|
||
|
}
|
||
|
|
||
|
var err error
|
||
|
var reply interface{}
|
||
|
for i := 0; i <= pending; i++ {
|
||
|
var e error
|
||
|
if reply, e = c.readReply(); e != nil {
|
||
|
return nil, c.fatal(e)
|
||
|
}
|
||
|
if e, ok := reply.(Error); ok && err == nil {
|
||
|
err = e
|
||
|
}
|
||
|
}
|
||
|
return reply, err
|
||
|
}
|