From 9b48b5e45fd37fd6ceeac1bd1eb2ad4b61bb8765 Mon Sep 17 00:00:00 2001 From: Vladimir Mihailenco Date: Fri, 19 Nov 2021 17:03:42 +0200 Subject: [PATCH] chore: add example how to delete keys without a ttl --- example/del-keys-without-ttl/README.md | 11 ++ example/del-keys-without-ttl/go.mod | 7 ++ example/del-keys-without-ttl/go.sum | 101 ++++++++++++++++++ example/del-keys-without-ttl/main.go | 142 +++++++++++++++++++++++++ example/lua-scripting/README.md | 2 +- pipeline.go | 10 ++ 6 files changed, 272 insertions(+), 1 deletion(-) create mode 100644 example/del-keys-without-ttl/README.md create mode 100644 example/del-keys-without-ttl/go.mod create mode 100644 example/del-keys-without-ttl/go.sum create mode 100644 example/del-keys-without-ttl/main.go diff --git a/example/del-keys-without-ttl/README.md b/example/del-keys-without-ttl/README.md new file mode 100644 index 00000000..c112ee25 --- /dev/null +++ b/example/del-keys-without-ttl/README.md @@ -0,0 +1,11 @@ +# Delete keys without a ttl + +This example demonstrates how to use `SCAN` and pipelines to efficiently delete keys without a TTL. + +To run this example: + +```shell +go run . +``` + +See [documentation](https://redis.uptrace.dev/guide/get-all-keys.html) for more details. diff --git a/example/del-keys-without-ttl/go.mod b/example/del-keys-without-ttl/go.mod new file mode 100644 index 00000000..85b9b185 --- /dev/null +++ b/example/del-keys-without-ttl/go.mod @@ -0,0 +1,7 @@ +module github.com/go-redis/redis/example/del-keys-without-ttl + +go 1.14 + +replace github.com/go-redis/redis/v8 => ../.. + +require github.com/go-redis/redis/v8 v8.0.0-00010101000000-000000000000 diff --git a/example/del-keys-without-ttl/go.sum b/example/del-keys-without-ttl/go.sum new file mode 100644 index 00000000..9dd0be6d --- /dev/null +++ b/example/del-keys-without-ttl/go.sum @@ -0,0 +1,101 @@ +github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE= +github.com/cespare/xxhash/v2 v2.1.2/go.mod 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00000000..2331ed10 --- /dev/null +++ b/example/del-keys-without-ttl/main.go @@ -0,0 +1,142 @@ +package main + +import ( + "context" + "fmt" + "sync" + + "github.com/go-redis/redis/v8" +) + +func main() { + ctx := context.Background() + + rdb := redis.NewClient(&redis.Options{ + Addr: ":6379", + }) + + ch := make(chan string, 100) + var wg sync.WaitGroup + + wg.Add(1) + go func() { + defer wg.Done() + deleted, err := process(ctx, rdb, ch) + if err != nil { + panic(err) + } + fmt.Println("deleted", deleted, "keys") + }() + + iter := rdb.Scan(ctx, 0, "", 0).Iterator() + for iter.Next(ctx) { + ch <- iter.Val() + } + if err := iter.Err(); err != nil { + panic(err) + } + + close(ch) + wg.Wait() +} + +func process(ctx context.Context, rdb *redis.Client, in <-chan string) (int, error) { + var wg sync.WaitGroup + + out := make(chan string, 100) + defer func() { + close(out) + wg.Wait() + }() + + wg.Add(1) + go func() { + defer wg.Done() + if err := del(ctx, rdb, out); err != nil { + panic(err) + } + }() + + var deleted int + + keys := make([]string, 0, 100) + for key := range in { + keys = append(keys, key) + if len(keys) < 100 { + continue + } + + var err error + keys, err = checkTTL(ctx, rdb, keys) + if err != nil { + return 0, err + } + + for _, key := range keys { + out <- key + } + deleted += len(keys) + + keys = keys[:0] + } + + if len(keys) > 0 { + keys, err := checkTTL(ctx, rdb, keys) + if err != nil { + return 0, err + } + + for _, key := range keys { + out <- key + } + deleted += len(keys) + } + + return deleted, nil +} + +func checkTTL(ctx context.Context, rdb *redis.Client, keys []string) ([]string, error) { + cmds, err := rdb.Pipelined(ctx, func(pipe redis.Pipeliner) error { + for _, key := range keys { + pipe.TTL(ctx, key) + } + return nil + }) + if err != nil { + return nil, err + } + + for i := len(cmds) - 1; i >= 0; i-- { + d, err := cmds[i].(*redis.DurationCmd).Result() + if err != nil { + return nil, err + } + if d != -1 { + keys = append(keys[:i], keys[i+1:]...) + } + } + + return keys, nil +} + +func del(ctx context.Context, rdb *redis.Client, in <-chan string) error { + pipe := rdb.Pipeline() + + for key := range in { + pipe.Del(ctx, key) + + if pipe.Len() < 100 { + continue + } + + if _, err := pipe.Exec(ctx); err != nil { + return err + } + } + + if _, err := pipe.Exec(ctx); err != nil { + return err + } + + return nil +} diff --git a/example/lua-scripting/README.md b/example/lua-scripting/README.md index bf802bfc..3272d7d3 100644 --- a/example/lua-scripting/README.md +++ b/example/lua-scripting/README.md @@ -1,6 +1,6 @@ # Redis Lua scripting example -This is an example for [Redis Lua scripting #](https://redis.uptrace.dev/guide/lua-scripting.html) +This is an example for [Redis Lua scripting](https://redis.uptrace.dev/guide/lua-scripting.html) article. To run it: ```shell diff --git a/pipeline.go b/pipeline.go index c6ec3409..31bab971 100644 --- a/pipeline.go +++ b/pipeline.go @@ -24,6 +24,7 @@ type pipelineExecer func(context.Context, []Cmder) error // depends of your batch size and/or use TxPipeline. type Pipeliner interface { StatefulCmdable + Len() int Do(ctx context.Context, args ...interface{}) *Cmd Process(ctx context.Context, cmd Cmder) error Close() error @@ -53,6 +54,15 @@ func (c *Pipeline) init() { c.statefulCmdable = c.Process } +// Len returns the number of queued commands. +func (c *Pipeline) Len() int { + c.mu.Lock() + ln := len(c.cmds) + c.mu.Unlock() + return ln +} + +// Do queues the custom command for later execution. func (c *Pipeline) Do(ctx context.Context, args ...interface{}) *Cmd { cmd := NewCmd(ctx, args...) _ = c.Process(ctx, cmd)