Allow passing context where possible

Author: vmihailenco

cluster.go

@@ -724,16 +724,24 @@ func (c *ClusterClient) Close() error {
 
 // Do creates a Cmd from the args and processes the cmd.
 func (c *ClusterClient) Do(args ...interface{}) *Cmd {
+	return c.DoContext(c.ctx, args...)
+}
+
+func (c *ClusterClient) DoContext(ctx context.Context, args ...interface{}) *Cmd {
 	cmd := NewCmd(args...)
-	c.Process(cmd)
+	c.ProcessContext(ctx, cmd)
 	return cmd
 }
 
 func (c *ClusterClient) Process(cmd Cmder) error {
-	return c.hooks.process(c.ctx, cmd, c.process)
+	return c.ProcessContext(c.ctx, cmd)
+}
+
+func (c *ClusterClient) ProcessContext(ctx context.Context, cmd Cmder) error {
+	return c.hooks.process(ctx, cmd, c.process)
 }
 
-func (c *ClusterClient) process(cmd Cmder) error {
+func (c *ClusterClient) process(ctx context.Context, cmd Cmder) error {
 	var node *clusterNode
 	var ask bool
 	for attempt := 0; attempt <= c.opt.MaxRedirects; attempt++ {
@@ -755,11 +763,11 @@ func (c *ClusterClient) process(cmd Cmder) error {
 			pipe := node.Client.Pipeline()
 			_ = pipe.Process(NewCmd("ASKING"))
 			_ = pipe.Process(cmd)
-			_, err = pipe.Exec()
+			_, err = pipe.ExecContext(ctx)
 			_ = pipe.Close()
 			ask = false
 		} else {
-			err = node.Client.Process(cmd)
+			err = node.Client.ProcessContext(ctx, cmd)
 		}
 
 		// If there is no error - we are done.
@@ -1022,11 +1030,11 @@ func (c *ClusterClient) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
 	return c.Pipeline().Pipelined(fn)
 }
 
-func (c *ClusterClient) processPipeline(cmds []Cmder) error {
+func (c *ClusterClient) processPipeline(ctx context.Context, cmds []Cmder) error {
 	return c.hooks.processPipeline(c.ctx, cmds, c._processPipeline)
 }
 
-func (c *ClusterClient) _processPipeline(cmds []Cmder) error {
+func (c *ClusterClient) _processPipeline(ctx context.Context, cmds []Cmder) error {
 	cmdsMap := newCmdsMap()
 	err := c.mapCmdsByNode(cmds, cmdsMap)
 	if err != nil {
@@ -1216,11 +1224,11 @@ func (c *ClusterClient) TxPipelined(fn func(Pipeliner) error) ([]Cmder, error) {
 	return c.TxPipeline().Pipelined(fn)
 }
 
-func (c *ClusterClient) processTxPipeline(cmds []Cmder) error {
-	return c.hooks.processPipeline(c.ctx, cmds, c._processTxPipeline)
+func (c *ClusterClient) processTxPipeline(ctx context.Context, cmds []Cmder) error {
+	return c.hooks.processPipeline(ctx, cmds, c._processTxPipeline)
 }
 
-func (c *ClusterClient) _processTxPipeline(cmds []Cmder) error {
+func (c *ClusterClient) _processTxPipeline(ctx context.Context, cmds []Cmder) error {
 	state, err := c.state.Get()
 	if err != nil {
 		return err

iterator.go

@@ -1,6 +1,8 @@
 package redis
 
-import "sync"
+import (
+	"sync"
+)
 
 // ScanIterator is used to incrementally iterate over a collection of elements.
 // It's safe for concurrent use by multiple goroutines.

options.go

@@ -16,9 +16,9 @@ import (
 
 // Limiter is the interface of a rate limiter or a circuit breaker.
 type Limiter interface {
-	// Allow returns a nil if operation is allowed or an error otherwise.
-	// If operation is allowed client must report the result of operation
-	// whether is a success or a failure.
+	// Allow returns nil if operation is allowed or an error otherwise.
+	// If operation is allowed client must ReportResult of the operation
+	// whether it is a success or a failure.
 	Allow() error
 	// ReportResult reports the result of previously allowed operation.
 	// nil indicates a success, non-nil error indicates a failure.

pipeline.go

@@ -1,12 +1,13 @@
 package redis
 
 import (
+	"context"
 	"sync"
 
 	"github.com/go-redis/redis/internal/pool"
 )
 
-type pipelineExecer func([]Cmder) error
+type pipelineExecer func(context.Context, []Cmder) error
 
 // Pipeliner is an mechanism to realise Redis Pipeline technique.
 //
@@ -28,6 +29,7 @@ type Pipeliner interface {
 	Close() error
 	Discard() error
 	Exec() ([]Cmder, error)
+	ExecContext(ctx context.Context) ([]Cmder, error)
 }
 
 var _ Pipeliner = (*Pipeline)(nil)
@@ -96,6 +98,10 @@ func (c *Pipeline) discard() error {
 // Exec always returns list of commands and error of the first failed
 // command if any.
 func (c *Pipeline) Exec() ([]Cmder, error) {
+	return c.ExecContext(nil)
+}
+
+func (c *Pipeline) ExecContext(ctx context.Context) ([]Cmder, error) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
@@ -110,10 +116,10 @@ func (c *Pipeline) Exec() ([]Cmder, error) {
 	cmds := c.cmds
 	c.cmds = nil
 
-	return cmds, c.exec(cmds)
+	return cmds, c.exec(ctx, cmds)
 }
 
-func (c *Pipeline) pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
+func (c *Pipeline) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
 	if err := fn(c); err != nil {
 		return nil, err
 	}
@@ -122,16 +128,12 @@ func (c *Pipeline) pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
 	return cmds, err
 }
 
-func (c *Pipeline) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
-	return c.pipelined(fn)
-}
-
 func (c *Pipeline) Pipeline() Pipeliner {
 	return c
 }
 
 func (c *Pipeline) TxPipelined(fn func(Pipeliner) error) ([]Cmder, error) {
-	return c.pipelined(fn)
+	return c.Pipelined(fn)
 }
 
 func (c *Pipeline) TxPipeline() Pipeliner {

redis.go

@@ -45,13 +45,15 @@ func (hs *hooks) AddHook(hook Hook) {
 	hs.hooks = append(hs.hooks, hook)
 }
 
-func (hs hooks) process(ctx context.Context, cmd Cmder, fn func(Cmder) error) error {
+func (hs hooks) process(
+	ctx context.Context, cmd Cmder, fn func(context.Context, Cmder) error,
+) error {
 	ctx, err := hs.beforeProcess(ctx, cmd)
 	if err != nil {
 		return err
 	}
 
-	cmdErr := fn(cmd)
+	cmdErr := fn(ctx, cmd)
 
 	_, err = hs.afterProcess(ctx, cmd)
 	if err != nil {
@@ -83,13 +85,15 @@ func (hs hooks) afterProcess(ctx context.Context, cmd Cmder) (context.Context, e
 	return ctx, nil
 }
 
-func (hs hooks) processPipeline(ctx context.Context, cmds []Cmder, fn func([]Cmder) error) error {
+func (hs hooks) processPipeline(
+	ctx context.Context, cmds []Cmder, fn func(context.Context, []Cmder) error,
+) error {
 	ctx, err := hs.beforeProcessPipeline(ctx, cmds)
 	if err != nil {
 		return err
 	}
 
-	cmdsErr := fn(cmds)
+	cmdsErr := fn(ctx, cmds)
 
 	_, err = hs.afterProcessPipeline(ctx, cmds)
 	if err != nil {
@@ -246,14 +250,7 @@ func (c *baseClient) initConn(cn *pool.Conn) error {
 	return nil
 }
 
-// Do creates a Cmd from the args and processes the cmd.
-func (c *baseClient) Do(args ...interface{}) *Cmd {
-	cmd := NewCmd(args...)
-	_ = c.process(cmd)
-	return cmd
-}
-
-func (c *baseClient) process(cmd Cmder) error {
+func (c *baseClient) process(ctx context.Context, cmd Cmder) error {
 	for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
 		if attempt > 0 {
 			time.Sleep(c.retryBackoff(attempt))
@@ -328,11 +325,11 @@ func (c *baseClient) getAddr() string {
 	return c.opt.Addr
 }
 
-func (c *baseClient) processPipeline(cmds []Cmder) error {
+func (c *baseClient) processPipeline(ctx context.Context, cmds []Cmder) error {
 	return c.generalProcessPipeline(cmds, c.pipelineProcessCmds)
 }
 
-func (c *baseClient) processTxPipeline(cmds []Cmder) error {
+func (c *baseClient) processTxPipeline(ctx context.Context, cmds []Cmder) error {
 	return c.generalProcessPipeline(cmds, c.txPipelineProcessCmds)
 }
 
@@ -503,16 +500,31 @@ func (c *Client) WithContext(ctx context.Context) *Client {
 	return &clone
 }
 
+// Do creates a Cmd from the args and processes the cmd.
+func (c *Client) Do(args ...interface{}) *Cmd {
+	return c.DoContext(c.ctx, args...)
+}
+
+func (c *Client) DoContext(ctx context.Context, args ...interface{}) *Cmd {
+	cmd := NewCmd(args...)
+	_ = c.ProcessContext(ctx, cmd)
+	return cmd
+}
+
 func (c *Client) Process(cmd Cmder) error {
-	return c.hooks.process(c.ctx, cmd, c.baseClient.process)
+	return c.ProcessContext(c.ctx, cmd)
 }
 
-func (c *Client) processPipeline(cmds []Cmder) error {
-	return c.hooks.processPipeline(c.ctx, cmds, c.baseClient.processPipeline)
+func (c *Client) ProcessContext(ctx context.Context, cmd Cmder) error {
+	return c.hooks.process(ctx, cmd, c.baseClient.process)
 }
 
-func (c *Client) processTxPipeline(cmds []Cmder) error {
-	return c.hooks.processPipeline(c.ctx, cmds, c.baseClient.processTxPipeline)
+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.processPipeline(ctx, cmds, c.baseClient.processTxPipeline)
 }
 
 // Options returns read-only Options that were used to create the client.
@@ -637,7 +649,11 @@ func newConn(opt *Options, cn *pool.Conn) *Conn {
 }
 
 func (c *Conn) Process(cmd Cmder) error {
-	return c.baseClient.process(cmd)
+	return c.ProcessContext(context.TODO(), cmd)
+}
+
+func (c *Conn) ProcessContext(ctx context.Context, cmd Cmder) error {
+	return c.baseClient.process(ctx, cmd)
 }
 
 func (c *Conn) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {

ring.go

@@ -396,13 +396,21 @@ func (c *Ring) WithContext(ctx context.Context) *Ring {
 
 // Do creates a Cmd from the args and processes the cmd.
 func (c *Ring) Do(args ...interface{}) *Cmd {
+	return c.DoContext(c.ctx, args...)
+}
+
+func (c *Ring) DoContext(ctx context.Context, args ...interface{}) *Cmd {
 	cmd := NewCmd(args...)
-	c.Process(cmd)
+	c.ProcessContext(ctx, cmd)
 	return cmd
 }
 
 func (c *Ring) Process(cmd Cmder) error {
-	return c.hooks.process(c.ctx, cmd, c.process)
+	return c.ProcessContext(c.ctx, cmd)
+}
+
+func (c *Ring) ProcessContext(ctx context.Context, cmd Cmder) error {
+	return c.hooks.process(ctx, cmd, c.process)
 }
 
 // Options returns read-only Options that were used to create the client.
@@ -532,7 +540,7 @@ func (c *Ring) cmdShard(cmd Cmder) (*ringShard, error) {
 	return c.shards.GetByKey(firstKey)
 }
 
-func (c *Ring) process(cmd Cmder) error {
+func (c *Ring) process(ctx context.Context, cmd Cmder) error {
 	for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
 		if attempt > 0 {
 			time.Sleep(c.retryBackoff(attempt))
@@ -544,7 +552,7 @@ func (c *Ring) process(cmd Cmder) error {
 			return err
 		}
 
-		err = shard.Client.Process(cmd)
+		err = shard.Client.ProcessContext(ctx, cmd)
 		if err == nil {
 			return nil
 		}
@@ -567,11 +575,11 @@ func (c *Ring) Pipeline() Pipeliner {
 	return &pipe
 }
 
-func (c *Ring) processPipeline(cmds []Cmder) error {
-	return c.hooks.processPipeline(c.ctx, cmds, c._processPipeline)
+func (c *Ring) processPipeline(ctx context.Context, cmds []Cmder) error {
+	return c.hooks.processPipeline(ctx, cmds, c._processPipeline)
 }
 
-func (c *Ring) _processPipeline(cmds []Cmder) error {
+func (c *Ring) _processPipeline(ctx context.Context, cmds []Cmder) error {
 	cmdsMap := make(map[string][]Cmder)
 	for _, cmd := range cmds {
 		cmdInfo := c.cmdInfo(cmd.Name())

sentinel.go

@@ -136,7 +136,11 @@ func (c *SentinelClient) WithContext(ctx context.Context) *SentinelClient {
 }
 
 func (c *SentinelClient) Process(cmd Cmder) error {
-	return c.baseClient.process(cmd)
+	return c.ProcessContext(c.ctx, cmd)
+}
+
+func (c *SentinelClient) ProcessContext(ctx context.Context, cmd Cmder) error {
+	return c.baseClient.process(ctx, cmd)
 }
 
 func (c *SentinelClient) pubSub() *PubSub {

tx.go

@@ -56,7 +56,11 @@ func (c *Tx) WithContext(ctx context.Context) *Tx {
 }
 
 func (c *Tx) Process(cmd Cmder) error {
-	return c.baseClient.process(cmd)
+	return c.ProcessContext(c.ctx, cmd)
+}
+
+func (c *Tx) ProcessContext(ctx context.Context, cmd Cmder) error {
+	return c.baseClient.process(ctx, cmd)
 }
 
 // Watch prepares a transaction and marks the keys to be watched

universal.go

@@ -162,7 +162,10 @@ type UniversalClient interface {
 	Context() context.Context
 	AddHook(Hook)
 	Watch(fn func(*Tx) error, keys ...string) error
+	Do(args ...interface{}) *Cmd
+	DoContext(ctx context.Context, args ...interface{}) *Cmd
 	Process(cmd Cmder) error
+	ProcessContext(ctx context.Context, cmd Cmder) error
 	Subscribe(channels ...string) *PubSub
 	PSubscribe(channels ...string) *PubSub
 	Close() error