From 45de1c42ae3164c66c4dfdb145975f29b9c6ba46 Mon Sep 17 00:00:00 2001
From: Vladimir Mihailenco <vladimir.webdev@gmail.com>
Date: Sun, 2 Feb 2020 13:01:57 +0200
Subject: [PATCH] Set error on the commands in case there are no more attempts
 left

---
 cluster.go | 112 +++++++++++++++++++++++++++++------------------------
 options.go |   3 ++
 2 files changed, 64 insertions(+), 51 deletions(-)

diff --git a/cluster.go b/cluster.go
index 53483332..697c4064 100644
--- a/cluster.go
+++ b/cluster.go
@@ -1046,7 +1046,7 @@ func (c *ClusterClient) processPipeline(ctx context.Context, cmds []Cmder) error
 
 func (c *ClusterClient) _processPipeline(ctx context.Context, cmds []Cmder) error {
 	cmdsMap := newCmdsMap()
-	err := c.mapCmdsByNode(cmds, cmdsMap)
+	err := c.mapCmdsByNode(cmdsMap, cmds)
 	if err != nil {
 		setCmdsErr(cmds, err)
 		return err
@@ -1080,11 +1080,15 @@ func (c *ClusterClient) _processPipeline(ctx context.Context, cmds []Cmder) erro
 						return c.pipelineReadCmds(node, rd, cmds, failedCmds)
 					})
 				})
-				if err != nil {
-					err = c.mapCmdsByNode(cmds, failedCmds)
-					if err != nil {
+				if err == nil {
+					return
+				}
+				if attempt < c.opt.MaxRedirects {
+					if err := c.mapCmdsByNode(failedCmds, cmds); err != nil {
 						setCmdsErr(cmds, err)
 					}
+				} else {
+					setCmdsErr(cmds, err)
 				}
 			}(node, cmds)
 		}
@@ -1099,41 +1103,27 @@ func (c *ClusterClient) _processPipeline(ctx context.Context, cmds []Cmder) erro
 	return cmdsFirstErr(cmds)
 }
 
-type cmdsMap struct {
-	mu sync.Mutex
-	m  map[*clusterNode][]Cmder
-}
-
-func newCmdsMap() *cmdsMap {
-	return &cmdsMap{
-		m: make(map[*clusterNode][]Cmder),
-	}
-}
-
-func (m *cmdsMap) Add(node *clusterNode, cmds ...Cmder) {
-	m.mu.Lock()
-	m.m[node] = append(m.m[node], cmds...)
-	m.mu.Unlock()
-}
-
-func (c *ClusterClient) mapCmdsByNode(cmds []Cmder, cmdsMap *cmdsMap) error {
+func (c *ClusterClient) mapCmdsByNode(cmdsMap *cmdsMap, cmds []Cmder) error {
 	state, err := c.state.Get()
 	if err != nil {
 		return err
 	}
 
-	cmdsAreReadOnly := c.opt.ReadOnly && c.cmdsAreReadOnly(cmds)
+	if c.opt.ReadOnly && c.cmdsAreReadOnly(cmds) {
+		for _, cmd := range cmds {
+			slot := c.cmdSlot(cmd)
+			node, err := c.slotReadOnlyNode(state, slot)
+			if err != nil {
+				return err
+			}
+			cmdsMap.Add(node, cmd)
+		}
+		return nil
+	}
+
 	for _, cmd := range cmds {
 		slot := c.cmdSlot(cmd)
-
-		var node *clusterNode
-		var err error
-		if cmdsAreReadOnly {
-			cmdInfo := c.cmdInfo(cmd.Name())
-			node, err = c.cmdNode(cmdInfo, slot)
-		} else {
-			node, err = state.slotMasterNode(slot)
-		}
+		node, err := state.slotMasterNode(slot)
 		if err != nil {
 			return err
 		}
@@ -1261,7 +1251,7 @@ func (c *ClusterClient) _processTxPipeline(ctx context.Context, cmds []Cmder) er
 							return err
 						}
 
-						err = cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
+						return cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
 							err := c.txPipelineReadQueued(rd, cmds, failedCmds)
 							if err != nil {
 								moved, ask, addr := isMovedError(err)
@@ -1272,13 +1262,16 @@ func (c *ClusterClient) _processTxPipeline(ctx context.Context, cmds []Cmder) er
 							}
 							return pipelineReadCmds(rd, cmds)
 						})
-						return err
 					})
-					if err != nil {
-						err = c.mapCmdsByNode(cmds, failedCmds)
-						if err != nil {
+					if err == nil {
+						return
+					}
+					if attempt < c.opt.MaxRedirects {
+						if err := c.mapCmdsByNode(failedCmds, cmds); err != nil {
 							setCmdsErr(cmds, err)
 						}
+					} else {
+						setCmdsErr(cmds, err)
 					}
 				}(node, cmds)
 			}
@@ -1561,29 +1554,27 @@ func (c *ClusterClient) cmdNode(cmdInfo *CommandInfo, slot int) (*clusterNode, e
 	}
 
 	if c.opt.ReadOnly && cmdInfo != nil && cmdInfo.ReadOnly {
-		if c.opt.RouteByLatency {
-			return state.slotClosestNode(slot)
-		}
-		if c.opt.RouteRandomly {
-			return state.slotRandomNode(slot)
-		}
-		return state.slotSlaveNode(slot)
+		return c.slotReadOnlyNode(state, slot)
 	}
-
 	return state.slotMasterNode(slot)
 }
 
+func (c *clusterClient) slotReadOnlyNode(state *clusterState, slot int) (*clusterNode, error) {
+	if c.opt.RouteByLatency {
+		return state.slotClosestNode(slot)
+	}
+	if c.opt.RouteRandomly {
+		return state.slotRandomNode(slot)
+	}
+	return state.slotSlaveNode(slot)
+}
+
 func (c *ClusterClient) slotMasterNode(slot int) (*clusterNode, error) {
 	state, err := c.state.Get()
 	if err != nil {
 		return nil, err
 	}
-
-	nodes := state.slotNodes(slot)
-	if len(nodes) > 0 {
-		return nodes[0], nil
-	}
-	return c.nodes.Random()
+	return state.slotMasterNode(slot)
 }
 
 func appendUniqueNode(nodes []*clusterNode, node *clusterNode) []*clusterNode {
@@ -1622,3 +1613,22 @@ func remove(ss []string, es ...string) []string {
 	}
 	return ss
 }
+
+//------------------------------------------------------------------------------
+
+type cmdsMap struct {
+	mu sync.Mutex
+	m  map[*clusterNode][]Cmder
+}
+
+func newCmdsMap() *cmdsMap {
+	return &cmdsMap{
+		m: make(map[*clusterNode][]Cmder),
+	}
+}
+
+func (m *cmdsMap) Add(node *clusterNode, cmds ...Cmder) {
+	m.mu.Lock()
+	m.m[node] = append(m.m[node], cmds...)
+	m.mu.Unlock()
+}
diff --git a/options.go b/options.go
index 1c8ccbe5..ae269199 100644
--- a/options.go
+++ b/options.go
@@ -152,6 +152,9 @@ func (opt *Options) init() {
 		opt.IdleCheckFrequency = time.Minute
 	}
 
+	if opt.MaxRetries == -1 {
+		opt.MaxRetries = 0
+	}
 	switch opt.MinRetryBackoff {
 	case -1:
 		opt.MinRetryBackoff = 0