buffered provider (libp2p#1149)

* provider: ResettableKeyStore

* keystore: remove mutex

* use datastore namespace

* don't sync to write to altDs

* simplify put

* deduplicate operation execution code

* buffered provider

* tests

* removing redundant code

* docs

* wait on empty queue

* fix flaky test

Author: guillaumemichel

go.mod

@@ -1,18 +1,19 @@
 module github.com/libp2p/go-libp2p-kad-dht
 
-go 1.24
+go 1.24.0
 
 require (
-	github.com/gammazero/deque v1.0.0
+	github.com/gammazero/deque v1.1.0
 	github.com/google/gopacket v1.1.19
 	github.com/google/uuid v1.6.0
 	github.com/guillaumemichel/reservedpool v0.2.0
 	github.com/hashicorp/golang-lru v1.0.2
 	github.com/ipfs/boxo v0.33.1
 	github.com/ipfs/go-cid v0.5.0
-	github.com/ipfs/go-datastore v0.8.2
+	github.com/ipfs/go-datastore v0.8.3
 	github.com/ipfs/go-detect-race v0.0.1
-	github.com/ipfs/go-log/v2 v2.8.0
+	github.com/ipfs/go-dsqueue v0.0.4
+	github.com/ipfs/go-log/v2 v2.8.1
 	github.com/ipfs/go-test v0.2.3
 	github.com/libp2p/go-libp2p v0.43.0
 	github.com/libp2p/go-libp2p-kbucket v0.7.1-0.20250718125122-f77e735b68e8
@@ -53,6 +54,7 @@ require (
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/gorilla/websocket v1.5.3 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
 	github.com/huin/goupnp v1.3.0 // indirect
 	github.com/ipfs/go-block-format v0.2.2 // indirect
 	github.com/ipld/go-ipld-prime v0.21.0 // indirect

go.sum

@@ -63,8 +63,8 @@ github.com/francoispqt/gojay v1.2.13/go.mod h1:ehT5mTG4ua4581f1++1WLG0vPdaA9HaiD
 github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
 github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/gammazero/deque v1.0.0 h1:LTmimT8H7bXkkCy6gZX7zNLtkbz4NdS2z8LZuor3j34=
-github.com/gammazero/deque v1.0.0/go.mod h1:iflpYvtGfM3U8S8j+sZEKIak3SAKYpA5/SQewgfXDKo=
+github.com/gammazero/deque v1.1.0 h1:OyiyReBbnEG2PP0Bnv1AASLIYvyKqIFN5xfl1t8oGLo=
+github.com/gammazero/deque v1.1.0/go.mod h1:JVrR+Bj1NMQbPnYclvDlvSX0nVGReLrQZ0aUMuWLctg=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
 github.com/go-check/check v0.0.0-20180628173108-788fd7840127/go.mod h1:9ES+weclKsC9YodN5RgxqK/VD9HM9JsCSh7rNhMZE98=
@@ -117,6 +117,8 @@ github.com/gxed/hashland/murmur3 v0.0.1/go.mod h1:KjXop02n4/ckmZSnY2+HKcLud/tcmv
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v1.0.2 h1:dV3g9Z/unq5DpblPpw+Oqcv4dU/1omnb4Ok8iPY6p1c=
 github.com/hashicorp/golang-lru v1.0.2/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/huin/goupnp v1.3.0 h1:UvLUlWDNpoUdYzb2TCn+MuTWtcjXKSza2n6CBdQ0xXc=
@@ -131,17 +133,19 @@ github.com/ipfs/go-cid v0.5.0 h1:goEKKhaGm0ul11IHA7I6p1GmKz8kEYniqFopaB5Otwg=
 github.com/ipfs/go-cid v0.5.0/go.mod h1:0L7vmeNXpQpUS9vt+yEARkJ8rOg43DF3iPgn4GIN0mk=
 github.com/ipfs/go-datastore v0.1.0/go.mod h1:d4KVXhMt913cLBEI/PXAy6ko+W7e9AhyAKBGh803qeE=
 github.com/ipfs/go-datastore v0.1.1/go.mod h1:w38XXW9kVFNp57Zj5knbKWM2T+KOZCGDRVNdgPHtbHw=
-github.com/ipfs/go-datastore v0.8.2 h1:Jy3wjqQR6sg/LhyY0NIePZC3Vux19nLtg7dx0TVqr6U=
-github.com/ipfs/go-datastore v0.8.2/go.mod h1:W+pI1NsUsz3tcsAACMtfC+IZdnQTnC/7VfPoJBQuts0=
+github.com/ipfs/go-datastore v0.8.3 h1:z391GsQyGKUIUof2tPoaZVeDknbt7fNHs6Gqjcw5Jo4=
+github.com/ipfs/go-datastore v0.8.3/go.mod h1:raxQ/CreIy9L6MxT71ItfMX12/ASN6EhXJoUFjICQ2M=
 github.com/ipfs/go-detect-race v0.0.1 h1:qX/xay2W3E4Q1U7d9lNs1sU9nvguX0a7319XbyQ6cOk=
 github.com/ipfs/go-detect-race v0.0.1/go.mod h1:8BNT7shDZPo99Q74BpGMK+4D8Mn4j46UU0LZ723meps=
 github.com/ipfs/go-ds-badger v0.0.7/go.mod h1:qt0/fWzZDoPW6jpQeqUjR5kBfhDNB65jd9YlmAvpQBk=
 github.com/ipfs/go-ds-leveldb v0.1.0/go.mod h1:hqAW8y4bwX5LWcCtku2rFNX3vjDZCy5LZCg+cSZvYb8=
+github.com/ipfs/go-dsqueue v0.0.4 h1:tesq26hKRYPG72Tu9kZKsbsLWp1KBfAxWNQlMyU17tk=
+github.com/ipfs/go-dsqueue v0.0.4/go.mod h1:K68ng9BVl+gLr8fqCJKaoXnXqo6MzQ6nV0MhZZFEwg4=
 github.com/ipfs/go-ipfs-delay v0.0.0-20181109222059-70721b86a9a8/go.mod h1:8SP1YXK1M1kXuc4KJZINY3TQQ03J2rwBG9QfXmbRPrw=
 github.com/ipfs/go-ipfs-util v0.0.1/go.mod h1:spsl5z8KUnrve+73pOhSVZND1SIxPW5RyBCNzQxlJBc=
 github.com/ipfs/go-log v0.0.1/go.mod h1:kL1d2/hzSpI0thNYjiKfjanbVNU+IIGA/WnNESY9leM=
-github.com/ipfs/go-log/v2 v2.8.0 h1:SptNTPJQV3s5EF4FdrTu/yVdOKfGbDgn1EBZx4til2o=
-github.com/ipfs/go-log/v2 v2.8.0/go.mod h1:2LEEhdv8BGubPeSFTyzbqhCqrwqxCbuTNTLWqgNAipo=
+github.com/ipfs/go-log/v2 v2.8.1 h1:Y/X36z7ASoLJaYIJAL4xITXgwf7RVeqb1+/25aq/Xk0=
+github.com/ipfs/go-log/v2 v2.8.1/go.mod h1:NyhTBcZmh2Y55eWVjOeKf8M7e4pnJYM3yDZNxQBWEEY=
 github.com/ipfs/go-test v0.2.3 h1:Z/jXNAReQFtCYyn7bsv/ZqUwS6E7iIcSpJ2CuzCvnrc=
 github.com/ipfs/go-test v0.2.3/go.mod h1:QW8vSKkwYvWFwIZQLGQXdkt9Ud76eQXRQ9Ao2H+cA1o=
 github.com/ipld/go-ipld-prime v0.21.0 h1:n4JmcpOlPDIxBcY037SVfpd1G+Sj1nKZah0m6QH9C2E=

provider/buffered/options.go

@@ -0,0 +1,65 @@
+// Package buffered provides a buffered provider implementation that queues operations
+// and processes them in batches for improved performance.
+package buffered
+
+import "time"
+
+const (
+	// DefaultDsName is the default datastore namespace for the buffered provider.
+	DefaultDsName = "bprov" // for buffered provider
+	// DefaultBatchSize is the default number of operations to process in a single batch.
+	DefaultBatchSize = 1 << 10
+	// DefaultIdleWriteTime is the default duration to wait before flushing pending operations.
+	DefaultIdleWriteTime = time.Minute
+)
+
+// config contains all options for the buffered provider.
+type config struct {
+	dsName        string
+	batchSize     int
+	idleWriteTime time.Duration
+}
+
+// Option is a function that configures the buffered provider.
+type Option func(*config)
+
+// getOpts creates a config and applies Options to it.
+func getOpts(opts []Option) config {
+	cfg := config{
+		dsName:        DefaultDsName,
+		batchSize:     DefaultBatchSize,
+		idleWriteTime: DefaultIdleWriteTime,
+	}
+
+	for _, opt := range opts {
+		opt(&cfg)
+	}
+	return cfg
+}
+
+// WithDsName sets the datastore namespace for the buffered provider.
+// If name is empty, the option is ignored.
+func WithDsName(name string) Option {
+	return func(c *config) {
+		if len(name) > 0 {
+			c.dsName = name
+		}
+	}
+}
+
+// WithBatchSize sets the number of operations to process in a single batch.
+// If n is zero or negative, the option is ignored.
+func WithBatchSize(n int) Option {
+	return func(c *config) {
+		if n > 0 {
+			c.batchSize = n
+		}
+	}
+}
+
+// WithIdleWriteTime sets the duration to wait before flushing pending operations.
+func WithIdleWriteTime(d time.Duration) Option {
+	return func(c *config) {
+		c.idleWriteTime = d
+	}
+}