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Add withConn and set cmd errors more consistently

This commit is contained in:
Vladimir Mihailenco 2019-08-08 16:54:38 +03:00
parent 178deea321
commit 2a46cb006d
4 changed files with 231 additions and 233 deletions
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250
cluster.go
View File

@ -745,14 +745,22 @@ func (c *ClusterClient) ProcessContext(ctx context.Context, cmd Cmder) error {
}
func (c *ClusterClient) process(ctx context.Context, cmd Cmder) error {
err := c._process(ctx, cmd)
if err != nil {
cmd.setErr(err)
return err
}
return nil
}
func (c *ClusterClient) _process(ctx context.Context, cmd Cmder) error {
cmdInfo := c.cmdInfo(cmd.Name())
slot := c.cmdSlot(cmd)
var node *clusterNode
var ask bool
var lastErr error
for attempt := 0; attempt <= c.opt.MaxRedirects; attempt++ {
var err error
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
return err
@ -760,10 +768,10 @@ func (c *ClusterClient) process(ctx context.Context, cmd Cmder) error {
}
if node == nil {
var err error
node, err = c.cmdNode(cmdInfo, slot)
if err != nil {
cmd.setErr(err)
break
return err
}
}
@ -771,23 +779,27 @@ func (c *ClusterClient) process(ctx context.Context, cmd Cmder) error {
pipe := node.Client.Pipeline()
_ = pipe.Process(NewCmd("ASKING"))
_ = pipe.Process(cmd)
_, err = pipe.ExecContext(ctx)
_, lastErr = pipe.ExecContext(ctx)
_ = pipe.Close()
ask = false
} else {
err = node.Client.ProcessContext(ctx, cmd)
lastErr = node.Client._process(ctx, cmd)
}
// If there is no error - we are done.
if err == nil {
break
if lastErr == nil {
return nil
}
if err != Nil {
if lastErr != Nil {
c.state.LazyReload()
}
if lastErr == pool.ErrClosed || isReadOnlyError(lastErr) {
node = nil
continue
}
// If slave is loading - pick another node.
if c.opt.ReadOnly && isLoadingError(err) {
if c.opt.ReadOnly && isLoadingError(lastErr) {
node.MarkAsFailing()
node = nil
continue
@ -795,21 +807,17 @@ func (c *ClusterClient) process(ctx context.Context, cmd Cmder) error {
var moved bool
var addr string
moved, ask, addr = isMovedError(err)
moved, ask, addr = isMovedError(lastErr)
if moved || ask {
var err error
node, err = c.nodes.Get(addr)
if err != nil {
break
return err
}
continue
}
if err == pool.ErrClosed || isReadOnlyError(err) {
node = nil
continue
}
if isRetryableError(err, cmd.readTimeout() == nil) {
if isRetryableError(lastErr, cmd.readTimeout() == nil) {
// First retry the same node.
if attempt == 0 {
continue
@ -821,10 +829,9 @@ func (c *ClusterClient) process(ctx context.Context, cmd Cmder) error {
continue
}
break
return lastErr
}
return cmd.Err()
return lastErr
}
// ForEachMaster concurrently calls the fn on each master node in the cluster.
@ -1052,6 +1059,7 @@ func (c *ClusterClient) _processPipeline(ctx context.Context, cmds []Cmder) erro
for attempt := 0; attempt <= c.opt.MaxRedirects; attempt++ {
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
setCmdsErr(cmds, err)
return err
}
}
@ -1064,18 +1072,24 @@ func (c *ClusterClient) _processPipeline(ctx context.Context, cmds []Cmder) erro
go func(node *clusterNode, cmds []Cmder) {
defer wg.Done()
cn, err := node.Client.getConn(ctx)
err := node.Client.withConn(ctx, func(ctx context.Context, cn *pool.Conn) error {
err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
return writeCmd(wr, cmds...)
})
if err != nil {
return err
}
return cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
return c.pipelineReadCmds(node, rd, cmds, failedCmds)
})
})
if err != nil {
if err == pool.ErrClosed {
_ = c.mapCmdsByNode(cmds, failedCmds)
} else {
err = c.mapCmdsByNode(cmds, failedCmds)
if err != nil {
setCmdsErr(cmds, err)
}
return
}
err = c.pipelineProcessCmds(ctx, node, cn, cmds, failedCmds)
node.Client.releaseConn(cn, err)
}(node, cmds)
}
@ -1100,10 +1114,15 @@ func newCmdsMap() *cmdsMap {
}
}
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 {
state, err := c.state.Get()
if err != nil {
setCmdsErr(cmds, err)
return err
}
@ -1122,10 +1141,7 @@ func (c *ClusterClient) mapCmdsByNode(cmds []Cmder, cmdsMap *cmdsMap) error {
if err != nil {
return err
}
cmdsMap.mu.Lock()
cmdsMap.m[node] = append(cmdsMap.m[node], cmd)
cmdsMap.mu.Unlock()
cmdsMap.Add(node, cmd)
}
return nil
}
@ -1140,87 +1156,55 @@ func (c *ClusterClient) cmdsAreReadOnly(cmds []Cmder) bool {
return true
}
func (c *ClusterClient) pipelineProcessCmds(
ctx context.Context, node *clusterNode, cn *pool.Conn, cmds []Cmder, failedCmds *cmdsMap,
) error {
err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
return writeCmd(wr, cmds...)
})
if err != nil {
setCmdsErr(cmds, err)
failedCmds.mu.Lock()
failedCmds.m[node] = cmds
failedCmds.mu.Unlock()
return err
}
return cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
return c.pipelineReadCmds(node, rd, cmds, failedCmds)
})
}
func (c *ClusterClient) pipelineReadCmds(
node *clusterNode, rd *proto.Reader, cmds []Cmder, failedCmds *cmdsMap,
) error {
var firstErr error
for _, cmd := range cmds {
err := cmd.readReply(rd)
if err == nil {
continue
}
if c.checkMovedErr(cmd, err, failedCmds) {
continue
}
if c.opt.ReadOnly && isLoadingError(err) {
node.MarkAsFailing()
} else if isRedisError(err) {
return err
}
if isRedisError(err) {
continue
}
failedCmds.mu.Lock()
failedCmds.m[node] = append(failedCmds.m[node], cmd)
failedCmds.mu.Unlock()
if firstErr == nil {
firstErr = err
}
return err
}
return firstErr
return nil
}
func (c *ClusterClient) checkMovedErr(
cmd Cmder, err error, failedCmds *cmdsMap,
) bool {
moved, ask, addr := isMovedError(err)
if !moved && !ask {
return false
}
node, err := c.nodes.Get(addr)
if err != nil {
return false
}
if moved {
c.state.LazyReload()
node, err := c.nodes.Get(addr)
if err != nil {
return false
}
failedCmds.mu.Lock()
failedCmds.m[node] = append(failedCmds.m[node], cmd)
failedCmds.mu.Unlock()
failedCmds.Add(node, cmd)
return true
}
if ask {
node, err := c.nodes.Get(addr)
if err != nil {
return false
}
failedCmds.mu.Lock()
failedCmds.m[node] = append(failedCmds.m[node], NewCmd("ASKING"), cmd)
failedCmds.mu.Unlock()
failedCmds.Add(node, NewCmd("ASKING"), cmd)
return true
}
return false
panic("not reached")
}
// TxPipeline acts like Pipeline, but wraps queued commands with MULTI/EXEC.
@ -1244,6 +1228,7 @@ func (c *ClusterClient) processTxPipeline(ctx context.Context, cmds []Cmder) err
func (c *ClusterClient) _processTxPipeline(ctx context.Context, cmds []Cmder) error {
state, err := c.state.Get()
if err != nil {
setCmdsErr(cmds, err)
return err
}
@ -1254,11 +1239,12 @@ func (c *ClusterClient) _processTxPipeline(ctx context.Context, cmds []Cmder) er
setCmdsErr(cmds, err)
continue
}
cmdsMap := map[*clusterNode][]Cmder{node: cmds}
cmdsMap := map[*clusterNode][]Cmder{node: cmds}
for attempt := 0; attempt <= c.opt.MaxRedirects; attempt++ {
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
setCmdsErr(cmds, err)
return err
}
}
@ -1271,18 +1257,33 @@ func (c *ClusterClient) _processTxPipeline(ctx context.Context, cmds []Cmder) er
go func(node *clusterNode, cmds []Cmder) {
defer wg.Done()
cn, err := node.Client.getConn(ctx)
err := node.Client.withConn(ctx, func(ctx context.Context, cn *pool.Conn) error {
err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
return txPipelineWriteMulti(wr, cmds)
})
if err != nil {
return err
}
err = 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)
if moved || ask {
return c.cmdsMoved(cmds, moved, ask, addr, failedCmds)
}
return err
}
return pipelineReadCmds(rd, cmds)
})
return err
})
if err != nil {
if err == pool.ErrClosed {
_ = c.mapCmdsByNode(cmds, failedCmds)
} else {
err = c.mapCmdsByNode(cmds, failedCmds)
if err != nil {
setCmdsErr(cmds, err)
}
return
}
err = c.txPipelineProcessCmds(ctx, node, cn, cmds, failedCmds)
node.Client.releaseConn(cn, err)
}(node, cmds)
}
@ -1306,31 +1307,6 @@ func (c *ClusterClient) mapCmdsBySlot(cmds []Cmder) map[int][]Cmder {
return cmdsMap
}
func (c *ClusterClient) txPipelineProcessCmds(
ctx context.Context, node *clusterNode, cn *pool.Conn, cmds []Cmder, failedCmds *cmdsMap,
) error {
err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
return txPipelineWriteMulti(wr, cmds)
})
if err != nil {
setCmdsErr(cmds, err)
failedCmds.mu.Lock()
failedCmds.m[node] = cmds
failedCmds.mu.Unlock()
return err
}
err = cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
err := c.txPipelineReadQueued(rd, cmds, failedCmds)
if err != nil {
setCmdsErr(cmds, err)
return err
}
return pipelineReadCmds(rd, cmds)
})
return err
}
func (c *ClusterClient) txPipelineReadQueued(
rd *proto.Reader, cmds []Cmder, failedCmds *cmdsMap,
) error {
@ -1342,14 +1318,9 @@ func (c *ClusterClient) txPipelineReadQueued(
for _, cmd := range cmds {
err := statusCmd.readReply(rd)
if err == nil {
if err == nil || c.checkMovedErr(cmd, err, failedCmds) || isRedisError(err) {
continue
}
if c.checkMovedErr(cmd, err, failedCmds) || isRedisError(err) {
continue
}
return err
}
@ -1364,20 +1335,39 @@ func (c *ClusterClient) txPipelineReadQueued(
switch line[0] {
case proto.ErrorReply:
err := proto.ParseErrorReply(line)
for _, cmd := range cmds {
if !c.checkMovedErr(cmd, err, failedCmds) {
break
}
}
return err
return proto.ParseErrorReply(line)
case proto.ArrayReply:
// ok
default:
err := fmt.Errorf("redis: expected '*', but got line %q", line)
return fmt.Errorf("redis: expected '*', but got line %q", line)
}
return nil
}
func (c *ClusterClient) cmdsMoved(
cmds []Cmder, moved, ask bool, addr string, failedCmds *cmdsMap,
) error {
node, err := c.nodes.Get(addr)
if err != nil {
return err
}
if moved {
c.state.LazyReload()
for _, cmd := range cmds {
failedCmds.Add(node, cmd)
}
return nil
}
if ask {
for _, cmd := range cmds {
failedCmds.Add(node, NewCmd("ASKING"), cmd)
}
return nil
}
return nil
}

8
command.go
View File

@ -123,6 +123,10 @@ func (cmd *baseCmd) stringArg(pos int) string {
return s
}
func (cmd *baseCmd) setErr(e error) {
cmd.err = e
}
func (cmd *baseCmd) Err() error {
return cmd.err
}
@ -135,10 +139,6 @@ func (cmd *baseCmd) setReadTimeout(d time.Duration) {
cmd._readTimeout = &d
}
func (cmd *baseCmd) setErr(e error) {
cmd.err = e
}
//------------------------------------------------------------------------------
type Cmd struct {

103
redis.go
View File

@ -235,7 +235,32 @@ func (c *baseClient) releaseConn(cn *pool.Conn, err error) {
}
}
func (c *baseClient) withConn(
ctx context.Context, fn func(context.Context, *pool.Conn) error,
) error {
cn, err := c.getConn(ctx)
if err != nil {
return err
}
defer func() {
c.releaseConn(cn, err)
}()
err = fn(ctx, cn)
return err
}
func (c *baseClient) process(ctx context.Context, cmd Cmder) error {
err := c._process(ctx, cmd)
if err != nil {
cmd.setErr(err)
return err
}
return nil
}
func (c *baseClient) _process(ctx context.Context, cmd Cmder) error {
var lastErr error
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
@ -243,37 +268,29 @@ func (c *baseClient) process(ctx context.Context, cmd Cmder) error {
}
}
cn, err := c.getConn(ctx)
if err != nil {
cmd.setErr(err)
if isRetryableError(err, true) {
continue
var retryTimeout bool
lastErr = c.withConn(ctx, func(ctx context.Context, cn *pool.Conn) error {
err := cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
return writeCmd(wr, cmd)
})
if err != nil {
retryTimeout = true
return err
}
return err
}
err = cn.WithWriter(ctx, c.opt.WriteTimeout, func(wr *proto.Writer) error {
return writeCmd(wr, cmd)
err = cn.WithReader(ctx, c.cmdTimeout(cmd), cmd.readReply)
if err != nil {
retryTimeout = cmd.readTimeout() == nil
return err
}
return nil
})
if err != nil {
c.releaseConn(cn, err)
cmd.setErr(err)
if isRetryableError(err, true) {
continue
}
return err
if lastErr == nil || !isRetryableError(lastErr, retryTimeout) {
return lastErr
}
err = cn.WithReader(ctx, c.cmdTimeout(cmd), cmd.readReply)
c.releaseConn(cn, err)
if err != nil && isRetryableError(err, cmd.readTimeout() == nil) {
continue
}
return err
}
return cmd.Err()
return lastErr
}
func (c *baseClient) retryBackoff(attempt int) time.Duration {
@ -325,6 +342,18 @@ type pipelineProcessor func(context.Context, *pool.Conn, []Cmder) (bool, error)
func (c *baseClient) generalProcessPipeline(
ctx context.Context, cmds []Cmder, p pipelineProcessor,
) error {
err := c._generalProcessPipeline(ctx, cmds, p)
if err != nil {
setCmdsErr(cmds, err)
return err
}
return cmdsFirstErr(cmds)
}
func (c *baseClient) _generalProcessPipeline(
ctx context.Context, cmds []Cmder, p pipelineProcessor,
) error {
var lastErr error
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
@ -332,20 +361,17 @@ func (c *baseClient) generalProcessPipeline(
}
}
cn, err := c.getConn(ctx)
if err != nil {
setCmdsErr(cmds, err)
var canRetry bool
lastErr = c.withConn(ctx, func(ctx context.Context, cn *pool.Conn) error {
var err error
canRetry, err = p(ctx, cn, cmds)
return err
}
canRetry, err := p(ctx, cn, cmds)
c.releaseConn(cn, err)
if !canRetry || !isRetryableError(err, true) {
break
})
if lastErr == nil || !canRetry || !isRetryableError(lastErr, true) {
return lastErr
}
}
return cmdsFirstErr(cmds)
return lastErr
}
func (c *baseClient) pipelineProcessCmds(
@ -355,7 +381,6 @@ func (c *baseClient) pipelineProcessCmds(
return writeCmd(wr, cmds...)
})
if err != nil {
setCmdsErr(cmds, err)
return true, err
}
@ -382,14 +407,12 @@ func (c *baseClient) txPipelineProcessCmds(
return txPipelineWriteMulti(wr, cmds)
})
if err != nil {
setCmdsErr(cmds, err)
return true, err
}
err = cn.WithReader(ctx, c.opt.ReadTimeout, func(rd *proto.Reader) error {
err := txPipelineReadQueued(rd, cmds)
if err != nil {
setCmdsErr(cmds, err)
return err
}
return pipelineReadCmds(rd, cmds)

103
ring.go
View File

@ -551,6 +551,16 @@ func (c *Ring) cmdShard(cmd Cmder) (*ringShard, error) {
}
func (c *Ring) process(ctx context.Context, cmd Cmder) error {
err := c._process(ctx, cmd)
if err != nil {
cmd.setErr(err)
return err
}
return nil
}
func (c *Ring) _process(ctx context.Context, cmd Cmder) error {
var lastErr error
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
@ -560,19 +570,15 @@ func (c *Ring) process(ctx context.Context, cmd Cmder) error {
shard, err := c.cmdShard(cmd)
if err != nil {
cmd.setErr(err)
return err
}
err = shard.Client.ProcessContext(ctx, cmd)
if err == nil {
return nil
}
if !isRetryableError(err, cmd.readTimeout() == nil) {
return err
lastErr = shard.Client._process(ctx, cmd)
if lastErr == nil || !isRetryableError(lastErr, cmd.readTimeout() == nil) {
return lastErr
}
}
return cmd.Err()
return lastErr
}
func (c *Ring) Pipelined(fn func(Pipeliner) error) ([]Cmder, error) {
@ -626,63 +632,42 @@ func (c *Ring) generalProcessPipeline(
cmdsMap[hash] = append(cmdsMap[hash], cmd)
}
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
return err
var wg sync.WaitGroup
for hash, cmds := range cmdsMap {
wg.Add(1)
go func(hash string, cmds []Cmder) {
defer wg.Done()
err := c.processShardPipeline(ctx, hash, cmds, tx)
if err != nil {
setCmdsErr(cmds, err)
}
}
var mu sync.Mutex
var failedCmdsMap map[string][]Cmder
var wg sync.WaitGroup
for hash, cmds := range cmdsMap {
wg.Add(1)
go func(hash string, cmds []Cmder) {
defer wg.Done()
shard, err := c.shards.GetByHash(hash)
if err != nil {
setCmdsErr(cmds, err)
return
}
cn, err := shard.Client.getConn(ctx)
if err != nil {
setCmdsErr(cmds, err)
return
}
var canRetry bool
if tx {
canRetry, err = shard.Client.txPipelineProcessCmds(ctx, cn, cmds)
} else {
canRetry, err = shard.Client.pipelineProcessCmds(ctx, cn, cmds)
}
shard.Client.releaseConn(cn, err)
if canRetry && isRetryableError(err, true) {
mu.Lock()
if failedCmdsMap == nil {
failedCmdsMap = make(map[string][]Cmder)
}
failedCmdsMap[hash] = cmds
mu.Unlock()
}
}(hash, cmds)
}
wg.Wait()
if len(failedCmdsMap) == 0 {
break
}
cmdsMap = failedCmdsMap
}(hash, cmds)
}
wg.Wait()
return cmdsFirstErr(cmds)
}
func (c *Ring) processShardPipeline(
ctx context.Context, hash string, cmds []Cmder, tx bool,
) error {
//TODO: retry?
shard, err := c.shards.GetByHash(hash)
if err != nil {
return err
}
if tx {
err = shard.Client._generalProcessPipeline(
ctx, cmds, shard.Client.txPipelineProcessCmds)
} else {
err = shard.Client._generalProcessPipeline(
ctx, cmds, shard.Client.pipelineProcessCmds)
}
return err
}
// Close closes the ring client, releasing any open resources.
//
// It is rare to Close a Ring, as the Ring is meant to be long-lived