784 lines
17 KiB
Go
784 lines
17 KiB
Go
package redis
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import (
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"context"
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"errors"
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"fmt"
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"sync/atomic"
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"time"
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"github.com/go-redis/redis/v8/internal"
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"github.com/go-redis/redis/v8/internal/pool"
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"github.com/go-redis/redis/v8/internal/proto"
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)
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// Nil reply returned by Redis when key does not exist.
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const Nil = proto.Nil
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func SetLogger(logger internal.Logging) {
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internal.Logger = logger
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}
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//------------------------------------------------------------------------------
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type Hook interface {
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BeforeProcess(ctx context.Context, cmd Cmder) (context.Context, error)
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AfterProcess(ctx context.Context, cmd Cmder) error
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BeforeProcessPipeline(ctx context.Context, cmds []Cmder) (context.Context, error)
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AfterProcessPipeline(ctx context.Context, cmds []Cmder) error
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}
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type hooks struct {
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hooks []Hook
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}
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func (hs *hooks) lock() {
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hs.hooks = hs.hooks[:len(hs.hooks):len(hs.hooks)]
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}
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func (hs hooks) clone() hooks {
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clone := hs
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clone.lock()
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return clone
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}
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func (hs *hooks) AddHook(hook Hook) {
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hs.hooks = append(hs.hooks, hook)
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}
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func (hs hooks) process(
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ctx context.Context, cmd Cmder, fn func(context.Context, Cmder) error,
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) error {
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if len(hs.hooks) == 0 {
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err := hs.withContext(ctx, func() error {
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return fn(ctx, cmd)
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})
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cmd.SetErr(err)
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return err
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}
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var hookIndex int
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var retErr error
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for ; hookIndex < len(hs.hooks) && retErr == nil; hookIndex++ {
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ctx, retErr = hs.hooks[hookIndex].BeforeProcess(ctx, cmd)
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if retErr != nil {
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cmd.SetErr(retErr)
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}
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}
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if retErr == nil {
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retErr = hs.withContext(ctx, func() error {
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return fn(ctx, cmd)
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})
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cmd.SetErr(retErr)
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}
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for hookIndex--; hookIndex >= 0; hookIndex-- {
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if err := hs.hooks[hookIndex].AfterProcess(ctx, cmd); err != nil {
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retErr = err
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cmd.SetErr(retErr)
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}
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}
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return retErr
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}
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func (hs hooks) processPipeline(
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ctx context.Context, cmds []Cmder, fn func(context.Context, []Cmder) error,
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) error {
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if len(hs.hooks) == 0 {
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err := hs.withContext(ctx, func() error {
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return fn(ctx, cmds)
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})
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return err
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}
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var hookIndex int
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var retErr error
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for ; hookIndex < len(hs.hooks) && retErr == nil; hookIndex++ {
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ctx, retErr = hs.hooks[hookIndex].BeforeProcessPipeline(ctx, cmds)
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if retErr != nil {
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setCmdsErr(cmds, retErr)
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}
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}
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if retErr == nil {
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retErr = hs.withContext(ctx, func() error {
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return fn(ctx, cmds)
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})
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}
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for hookIndex--; hookIndex >= 0; hookIndex-- {
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if err := hs.hooks[hookIndex].AfterProcessPipeline(ctx, cmds); err != nil {
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retErr = err
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setCmdsErr(cmds, retErr)
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}
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}
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return retErr
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}
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func (hs hooks) processTxPipeline(
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ctx context.Context, cmds []Cmder, fn func(context.Context, []Cmder) error,
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) error {
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cmds = wrapMultiExec(ctx, cmds)
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return hs.processPipeline(ctx, cmds, fn)
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}
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func (hs hooks) withContext(ctx context.Context, fn func() error) error {
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return fn()
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}
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//------------------------------------------------------------------------------
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type baseClient struct {
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opt *Options
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connPool pool.Pooler
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onClose func() error // hook called when client is closed
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}
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func newBaseClient(opt *Options, connPool pool.Pooler) *baseClient {
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return &baseClient{
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opt: opt,
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connPool: connPool,
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}
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}
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func (c *baseClient) clone() *baseClient {
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clone := *c
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return &clone
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}
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func (c *baseClient) withTimeout(timeout time.Duration) *baseClient {
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opt := c.opt.clone()
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opt.ReadTimeout = timeout
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opt.WriteTimeout = timeout
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clone := c.clone()
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clone.opt = opt
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return clone
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}
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func (c *baseClient) String() string {
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return fmt.Sprintf("Redis<%s db:%d>", c.getAddr(), c.opt.DB)
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}
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func (c *baseClient) newConn(ctx context.Context) (*pool.Conn, error) {
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cn, err := c.connPool.NewConn(ctx)
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if err != nil {
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return nil, err
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}
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err = c.initConn(ctx, cn)
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if err != nil {
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_ = c.connPool.CloseConn(cn)
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return nil, err
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}
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return cn, nil
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}
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func (c *baseClient) getConn(ctx context.Context) (*pool.Conn, error) {
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if c.opt.Limiter != nil {
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err := c.opt.Limiter.Allow()
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if err != nil {
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return nil, err
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}
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}
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cn, err := c._getConn(ctx)
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if err != nil {
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if c.opt.Limiter != nil {
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c.opt.Limiter.ReportResult(err)
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}
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return nil, err
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}
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return cn, nil
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}
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func (c *baseClient) _getConn(ctx context.Context) (*pool.Conn, error) {
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cn, err := c.connPool.Get(ctx)
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if err != nil {
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return nil, err
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}
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if cn.Inited {
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return cn, nil
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}
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if err := c.initConn(ctx, cn); err != nil {
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c.connPool.Remove(ctx, cn, err)
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if err := errors.Unwrap(err); err != nil {
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return nil, err
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}
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return nil, err
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}
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return cn, nil
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}
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func (c *baseClient) initConn(ctx context.Context, cn *pool.Conn) error {
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if cn.Inited {
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return nil
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}
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cn.Inited = true
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if c.opt.Password == "" &&
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c.opt.DB == 0 &&
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!c.opt.readOnly &&
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c.opt.OnConnect == nil {
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return nil
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}
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connPool := pool.NewSingleConnPool(c.connPool, cn)
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conn := newConn(ctx, c.opt, connPool)
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_, err := conn.Pipelined(ctx, func(pipe Pipeliner) error {
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if c.opt.Password != "" {
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if c.opt.Username != "" {
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pipe.AuthACL(ctx, c.opt.Username, c.opt.Password)
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} else {
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pipe.Auth(ctx, c.opt.Password)
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}
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}
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if c.opt.DB > 0 {
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pipe.Select(ctx, c.opt.DB)
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}
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if c.opt.readOnly {
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pipe.ReadOnly(ctx)
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}
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return nil
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})
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if err != nil {
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return err
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}
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if c.opt.OnConnect != nil {
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return c.opt.OnConnect(ctx, conn)
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}
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return nil
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}
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func (c *baseClient) releaseConn(ctx context.Context, cn *pool.Conn, err error) {
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if c.opt.Limiter != nil {
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c.opt.Limiter.ReportResult(err)
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}
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if isBadConn(err, false) {
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c.connPool.Remove(ctx, cn, err)
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} else {
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c.connPool.Put(ctx, cn)
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}
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}
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func (c *baseClient) withConn(
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ctx context.Context, fn func(context.Context, *pool.Conn) error,
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) error {
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cn, err := c.getConn(ctx)
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if err != nil {
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return err
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}
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defer func() {
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c.releaseConn(ctx, cn, err)
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}()
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done := ctx.Done() //nolint:ifshort
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if done == nil {
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err = fn(ctx, cn)
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return err
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}
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errc := make(chan error, 1)
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go func() { errc <- fn(ctx, cn) }()
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select {
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case <-done:
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_ = cn.Close()
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// Wait for the goroutine to finish and send something.
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<-errc
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err = ctx.Err()
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return err
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case err = <-errc:
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return err
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}
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}
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func (c *baseClient) process(ctx context.Context, cmd Cmder) error {
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var lastErr error
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for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
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attempt := attempt
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retry, err := c._process(ctx, cmd, attempt)
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if err == nil || !retry {
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return err
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}
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lastErr = err
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}
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return lastErr
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}
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func (c *baseClient) _process(ctx context.Context, cmd Cmder, attempt int) (bool, error) {
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if attempt > 0 {
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if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
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return false, err
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}
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}
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retryTimeout := uint32(1)
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err := c.withConn(ctx, func(ctx context.Context, cn *pool.Conn) error {
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err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
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return writeCmd(wr, cmd)
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})
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if err != nil {
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return err
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}
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err = cn.WithReader(ctx, c.cmdTimeout(cmd), cmd.readReply)
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if err != nil {
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if cmd.readTimeout() == nil {
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atomic.StoreUint32(&retryTimeout, 1)
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}
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return err
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}
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return nil
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})
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if err == nil {
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return false, nil
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}
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retry := shouldRetry(err, atomic.LoadUint32(&retryTimeout) == 1)
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return retry, err
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}
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func (c *baseClient) retryBackoff(attempt int) time.Duration {
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return internal.RetryBackoff(attempt, c.opt.MinRetryBackoff, c.opt.MaxRetryBackoff)
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}
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func (c *baseClient) cmdTimeout(cmd Cmder) time.Duration {
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if timeout := cmd.readTimeout(); timeout != nil {
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t := *timeout
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if t == 0 {
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return 0
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}
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return t + 10*time.Second
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}
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return c.opt.ReadTimeout
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}
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// Close closes the client, releasing any open resources.
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//
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// It is rare to Close a Client, as the Client is meant to be
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// long-lived and shared between many goroutines.
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func (c *baseClient) Close() error {
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var firstErr error
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if c.onClose != nil {
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if err := c.onClose(); err != nil {
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firstErr = err
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}
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}
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if err := c.connPool.Close(); err != nil && firstErr == nil {
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firstErr = err
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}
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return firstErr
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}
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func (c *baseClient) getAddr() string {
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return c.opt.Addr
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}
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func (c *baseClient) processPipeline(ctx context.Context, cmds []Cmder) error {
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return c.generalProcessPipeline(ctx, cmds, c.pipelineProcessCmds)
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}
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func (c *baseClient) processTxPipeline(ctx context.Context, cmds []Cmder) error {
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return c.generalProcessPipeline(ctx, cmds, c.txPipelineProcessCmds)
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}
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type pipelineProcessor func(context.Context, *pool.Conn, []Cmder) (bool, error)
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func (c *baseClient) generalProcessPipeline(
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ctx context.Context, cmds []Cmder, p pipelineProcessor,
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) error {
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err := c._generalProcessPipeline(ctx, cmds, p)
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if err != nil {
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setCmdsErr(cmds, err)
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return err
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}
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return cmdsFirstErr(cmds)
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}
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func (c *baseClient) _generalProcessPipeline(
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ctx context.Context, cmds []Cmder, p pipelineProcessor,
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) error {
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var lastErr error
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for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
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if attempt > 0 {
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if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
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return err
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}
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}
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var canRetry bool
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lastErr = c.withConn(ctx, func(ctx context.Context, cn *pool.Conn) error {
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var err error
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canRetry, err = p(ctx, cn, cmds)
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return err
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})
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if lastErr == nil || !canRetry || !shouldRetry(lastErr, true) {
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return lastErr
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}
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}
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return lastErr
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}
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func (c *baseClient) pipelineProcessCmds(
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ctx context.Context, cn *pool.Conn, cmds []Cmder,
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) (bool, error) {
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err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
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return writeCmds(wr, cmds)
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})
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if err != nil {
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return true, err
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}
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err = cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
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return pipelineReadCmds(rd, cmds)
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})
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return true, err
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}
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func pipelineReadCmds(rd *proto.Reader, cmds []Cmder) error {
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for _, cmd := range cmds {
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err := cmd.readReply(rd)
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cmd.SetErr(err)
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if err != nil && !isRedisError(err) {
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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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|
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func (c *baseClient) txPipelineProcessCmds(
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ctx context.Context, cn *pool.Conn, cmds []Cmder,
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) (bool, error) {
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err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
|
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return writeCmds(wr, cmds)
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})
|
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if err != nil {
|
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return true, err
|
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}
|
|
|
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err = cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
|
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statusCmd := cmds[0].(*StatusCmd)
|
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// Trim multi and exec.
|
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cmds = cmds[1 : len(cmds)-1]
|
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|
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err := txPipelineReadQueued(rd, statusCmd, cmds)
|
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if err != nil {
|
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return err
|
|
}
|
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|
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return pipelineReadCmds(rd, cmds)
|
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})
|
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return false, err
|
|
}
|
|
|
|
func wrapMultiExec(ctx context.Context, cmds []Cmder) []Cmder {
|
|
if len(cmds) == 0 {
|
|
panic("not reached")
|
|
}
|
|
cmdCopy := make([]Cmder, len(cmds)+2)
|
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cmdCopy[0] = NewStatusCmd(ctx, "multi")
|
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copy(cmdCopy[1:], cmds)
|
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cmdCopy[len(cmdCopy)-1] = NewSliceCmd(ctx, "exec")
|
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return cmdCopy
|
|
}
|
|
|
|
func txPipelineReadQueued(rd *proto.Reader, statusCmd *StatusCmd, cmds []Cmder) error {
|
|
// Parse queued replies.
|
|
if err := statusCmd.readReply(rd); err != nil {
|
|
return err
|
|
}
|
|
|
|
for range cmds {
|
|
if err := statusCmd.readReply(rd); err != nil && !isRedisError(err) {
|
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return err
|
|
}
|
|
}
|
|
|
|
// Parse number of replies.
|
|
line, err := rd.ReadLine()
|
|
if err != nil {
|
|
if err == Nil {
|
|
err = TxFailedErr
|
|
}
|
|
return err
|
|
}
|
|
|
|
switch line[0] {
|
|
case proto.ErrorReply:
|
|
return proto.ParseErrorReply(line)
|
|
case proto.ArrayReply:
|
|
// ok
|
|
default:
|
|
err := fmt.Errorf("redis: expected '*', but got line %q", line)
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
// Client is a Redis client representing a pool of zero or more
|
|
// underlying connections. It's safe for concurrent use by multiple
|
|
// goroutines.
|
|
type Client struct {
|
|
*baseClient
|
|
cmdable
|
|
hooks
|
|
ctx context.Context
|
|
}
|
|
|
|
// NewClient returns a client to the Redis Server specified by Options.
|
|
func NewClient(opt *Options) *Client {
|
|
opt.init()
|
|
|
|
c := Client{
|
|
baseClient: newBaseClient(opt, newConnPool(opt)),
|
|
ctx: context.Background(),
|
|
}
|
|
c.cmdable = c.Process
|
|
|
|
return &c
|
|
}
|
|
|
|
func (c *Client) clone() *Client {
|
|
clone := *c
|
|
clone.cmdable = clone.Process
|
|
clone.hooks.lock()
|
|
return &clone
|
|
}
|
|
|
|
func (c *Client) WithTimeout(timeout time.Duration) *Client {
|
|
clone := c.clone()
|
|
clone.baseClient = c.baseClient.withTimeout(timeout)
|
|
return clone
|
|
}
|
|
|
|
func (c *Client) Context() context.Context {
|
|
return c.ctx
|
|
}
|
|
|
|
func (c *Client) WithContext(ctx context.Context) *Client {
|
|
if ctx == nil {
|
|
panic("nil context")
|
|
}
|
|
clone := c.clone()
|
|
clone.ctx = ctx
|
|
return clone
|
|
}
|
|
|
|
func (c *Client) Conn(ctx context.Context) *Conn {
|
|
return newConn(ctx, c.opt, pool.NewStickyConnPool(c.connPool))
|
|
}
|
|
|
|
// Do creates a Cmd from the args and processes the cmd.
|
|
func (c *Client) Do(ctx context.Context, args ...interface{}) *Cmd {
|
|
cmd := NewCmd(ctx, args...)
|
|
_ = c.Process(ctx, cmd)
|
|
return cmd
|
|
}
|
|
|
|
func (c *Client) Process(ctx context.Context, cmd Cmder) error {
|
|
return c.hooks.process(ctx, cmd, c.baseClient.process)
|
|
}
|
|
|
|
func (c *Client) processPipeline(ctx context.Context, cmds []Cmder) error {
|
|
return c.hooks.processPipeline(ctx, cmds, c.baseClient.processPipeline)
|
|
}
|
|
|
|
func (c *Client) processTxPipeline(ctx context.Context, cmds []Cmder) error {
|
|
return c.hooks.processTxPipeline(ctx, cmds, c.baseClient.processTxPipeline)
|
|
}
|
|
|
|
// Options returns read-only Options that were used to create the client.
|
|
func (c *Client) Options() *Options {
|
|
return c.opt
|
|
}
|
|
|
|
type PoolStats pool.Stats
|
|
|
|
// PoolStats returns connection pool stats.
|
|
func (c *Client) PoolStats() *PoolStats {
|
|
stats := c.connPool.Stats()
|
|
return (*PoolStats)(stats)
|
|
}
|
|
|
|
func (c *Client) Pipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) {
|
|
return c.Pipeline().Pipelined(ctx, fn)
|
|
}
|
|
|
|
func (c *Client) Pipeline() Pipeliner {
|
|
pipe := Pipeline{
|
|
ctx: c.ctx,
|
|
exec: c.processPipeline,
|
|
}
|
|
pipe.init()
|
|
return &pipe
|
|
}
|
|
|
|
func (c *Client) TxPipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) {
|
|
return c.TxPipeline().Pipelined(ctx, fn)
|
|
}
|
|
|
|
// TxPipeline acts like Pipeline, but wraps queued commands with MULTI/EXEC.
|
|
func (c *Client) TxPipeline() Pipeliner {
|
|
pipe := Pipeline{
|
|
ctx: c.ctx,
|
|
exec: c.processTxPipeline,
|
|
}
|
|
pipe.init()
|
|
return &pipe
|
|
}
|
|
|
|
func (c *Client) pubSub() *PubSub {
|
|
pubsub := &PubSub{
|
|
opt: c.opt,
|
|
|
|
newConn: func(ctx context.Context, channels []string) (*pool.Conn, error) {
|
|
return c.newConn(ctx)
|
|
},
|
|
closeConn: c.connPool.CloseConn,
|
|
}
|
|
pubsub.init()
|
|
return pubsub
|
|
}
|
|
|
|
// Subscribe subscribes the client to the specified channels.
|
|
// Channels can be omitted to create empty subscription.
|
|
// Note that this method does not wait on a response from Redis, so the
|
|
// subscription may not be active immediately. To force the connection to wait,
|
|
// you may call the Receive() method on the returned *PubSub like so:
|
|
//
|
|
// sub := client.Subscribe(queryResp)
|
|
// iface, err := sub.Receive()
|
|
// if err != nil {
|
|
// // handle error
|
|
// }
|
|
//
|
|
// // Should be *Subscription, but others are possible if other actions have been
|
|
// // taken on sub since it was created.
|
|
// switch iface.(type) {
|
|
// case *Subscription:
|
|
// // subscribe succeeded
|
|
// case *Message:
|
|
// // received first message
|
|
// case *Pong:
|
|
// // pong received
|
|
// default:
|
|
// // handle error
|
|
// }
|
|
//
|
|
// ch := sub.Channel()
|
|
func (c *Client) Subscribe(ctx context.Context, channels ...string) *PubSub {
|
|
pubsub := c.pubSub()
|
|
if len(channels) > 0 {
|
|
_ = pubsub.Subscribe(ctx, channels...)
|
|
}
|
|
return pubsub
|
|
}
|
|
|
|
// PSubscribe subscribes the client to the given patterns.
|
|
// Patterns can be omitted to create empty subscription.
|
|
func (c *Client) PSubscribe(ctx context.Context, channels ...string) *PubSub {
|
|
pubsub := c.pubSub()
|
|
if len(channels) > 0 {
|
|
_ = pubsub.PSubscribe(ctx, channels...)
|
|
}
|
|
return pubsub
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
|
|
type conn struct {
|
|
baseClient
|
|
cmdable
|
|
statefulCmdable
|
|
hooks // TODO: inherit hooks
|
|
}
|
|
|
|
// Conn is like Client, but its pool contains single connection.
|
|
type Conn struct {
|
|
*conn
|
|
ctx context.Context
|
|
}
|
|
|
|
func newConn(ctx context.Context, opt *Options, connPool pool.Pooler) *Conn {
|
|
c := Conn{
|
|
conn: &conn{
|
|
baseClient: baseClient{
|
|
opt: opt,
|
|
connPool: connPool,
|
|
},
|
|
},
|
|
ctx: ctx,
|
|
}
|
|
c.cmdable = c.Process
|
|
c.statefulCmdable = c.Process
|
|
return &c
|
|
}
|
|
|
|
func (c *Conn) Process(ctx context.Context, cmd Cmder) error {
|
|
return c.hooks.process(ctx, cmd, c.baseClient.process)
|
|
}
|
|
|
|
func (c *Conn) processPipeline(ctx context.Context, cmds []Cmder) error {
|
|
return c.hooks.processPipeline(ctx, cmds, c.baseClient.processPipeline)
|
|
}
|
|
|
|
func (c *Conn) processTxPipeline(ctx context.Context, cmds []Cmder) error {
|
|
return c.hooks.processTxPipeline(ctx, cmds, c.baseClient.processTxPipeline)
|
|
}
|
|
|
|
func (c *Conn) Pipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) {
|
|
return c.Pipeline().Pipelined(ctx, fn)
|
|
}
|
|
|
|
func (c *Conn) Pipeline() Pipeliner {
|
|
pipe := Pipeline{
|
|
ctx: c.ctx,
|
|
exec: c.processPipeline,
|
|
}
|
|
pipe.init()
|
|
return &pipe
|
|
}
|
|
|
|
func (c *Conn) TxPipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) {
|
|
return c.TxPipeline().Pipelined(ctx, fn)
|
|
}
|
|
|
|
// TxPipeline acts like Pipeline, but wraps queued commands with MULTI/EXEC.
|
|
func (c *Conn) TxPipeline() Pipeliner {
|
|
pipe := Pipeline{
|
|
ctx: c.ctx,
|
|
exec: c.processTxPipeline,
|
|
}
|
|
pipe.init()
|
|
return &pipe
|
|
}
|